US20020183593A1 - Cannula-based surgical instrument and method - Google Patents
Cannula-based surgical instrument and method Download PDFInfo
- Publication number
- US20020183593A1 US20020183593A1 US10/174,404 US17440402A US2002183593A1 US 20020183593 A1 US20020183593 A1 US 20020183593A1 US 17440402 A US17440402 A US 17440402A US 2002183593 A1 US2002183593 A1 US 2002183593A1
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- United States
- Prior art keywords
- cannula
- retractor
- endoscope
- lumen
- cradle
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/0218—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors for minimally invasive surgery
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00064—Constructional details of the endoscope body
- A61B1/00071—Insertion part of the endoscope body
- A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
- A61B1/00091—Nozzles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/012—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor characterised by internal passages or accessories therefor
- A61B1/015—Control of fluid supply or evacuation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/012—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor characterised by internal passages or accessories therefor
- A61B1/018—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor characterised by internal passages or accessories therefor for receiving instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/12—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with cooling or rinsing arrangements
- A61B1/126—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with cooling or rinsing arrangements provided with means for cleaning in-use
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00008—Vein tendon strippers
Definitions
- This invention relates to a cannula used for endoscopic surgery, and more particularly to a cannula and method for maintaining a clear visual field for an endoscope housed with the cannula.
- Endoscopic surgery allows a surgeon to perform safe and successful procedures because of the surgeon's ability to view the surgical site through the endoscope lens.
- the cannula housing the endoscope has a transparent blunt dissection tip through which the surgeon views the surgical site.
- the blunt dissection tip protects the endoscope lens from being smeared by blood or fatty tissue present at the surgical site, or from being fogged due to the moist subcutaneous environment.
- many surgical procedures cannot be performed using a blunt dissection tip.
- side branches and vessel ends of a vessel must be transected to harvest the vessel, the end of the cannula must be open to allow the surgical tools to extend from the cannula.
- the endoscope lens is subject to the adverse conditions described above. The surgeon is forced to repeatedly remove the cannula from the body to clean the endoscope lens. This increases the length and risks of the operation.
- a remote endoscopic washing system would be desirable for more effectively cleansing the endoscope lens during a surgical procedure by allowing the surgeon to control the angle at which cleansing fluid is sprayed as well as allowing the surgeon to use the same apparatus to irrigate the surgical site itself.
- a retractor is positioned within a cannula with a dissection cradle end of the retractor positioned at the distal end of the cannula.
- the retractor includes a first portion that has an axis approximately parallel to a central axis of the cannula, and a second portion that has an axis which is at an angle with respect to the central axis of the cannula.
- the dissection cradle is located at the distal end of the second portion of the retractor.
- the retractor includes two legs having substantially parallel axes that selectively protrude from the distal end of the cannula.
- the protruding legs support the dissection cradle formed in the shape of a partial loop that is positioned in a plane skewed relative to the axes of the legs, with a bottom of the loop directed away from the cannula.
- the surgeon when the surgeon locates a vein and side branch of interest, the surgeon extends the retractor to cradle the vein in the dissection cradle. Once cradled, the retractor may be fully extended, displacing the vein away from the axis of the cannula, causing the side branch to be isolated and exposed to a surgical tool. The surgical tool may then be extended from within the cannula to operate on the isolated and exposed side branch.
- a remote irrigation system is built into the cannula.
- one of the legs which comprise the retractor of the present invention is hollow, and is attached to a spray nozzle disposed in the distal end of the retractor.
- the proximal end of the hollow leg is attached to a fluid input tube which selectively provides irrigation fluid under pressure for washing the endoscope lens.
- the spray nozzle When extended slightly beyond the distal end of the cannula, the spray nozzle is positioned to direct the spray of irrigation fluid at an angle approximately normal to the endoscope lens. This provides for an extremely effective cleaning action, and minimizes the need for removal of the endoscope during surgical procedures for manual cleaning.
- the retractor is extended out of the cannula toward the area requiring irrigation, and an irrigation fluid can be sprayed directly on the site. Finally, as the spray is directed back toward the lens, the surgeon can visually adjust the extension of the retractor to accurately direct the spray toward the lens or surgical site.
- the hollow leg moves within a lumen in the cannula in fluid-resistant sliding engagement, and the fluid input tube is coupled to this lumen.
- the maximal outer dimension of a region of the hollow leg is slightly less than a maximal inner dimension of the lumen.
- the hollow leg includes a semi-rigid plastic tubing, and fits within an irrigation tube which lines the inside of the lumen.
- the fluid input tube attaches to the irrigation tube and extends out of the cannula handle for receiving irrigation fluid.
- the use of flexible, semi-rigid plastic tubes provides fluid seals throughout the irrigation system to minimize leakage.
- the cannula contains a separate irrigation lumen which has a spray nozzle disposed in a fixed position at its distal end. The spray nozzle is positioned within the cannula to allow the proper angle of incidence for the spray to effectively clean the lens.
- the dissection cradle is supported by only one leg, and the lumen which previously held the second leg instead is fitted with a spray nozzle directed toward the endoscope lens.
- a nozzle tube situated within a cannula lumen is selectively extensible responsive to the application of hydraulic pressure.
- FIG. 1 is a perspective view of a preferred embodiment of cannula 100 showing retractor 112 in an extended position.
- FIG. 2 a is a cut-away side view of retractor 112 and cannula 100 .
- FIG. 2 b is a top view of retractor 112 .
- FIG. 3 a is a perspective side view of cannula 100 with a saphenous vein positioned within the cradle 116 .
- FIG. 3 b is a perspective side view of the distal end 122 of cannula 100 in an embodiment in which an endoscope 126 and a surgical tool 120 are present and partially extended.
- FIG. 3 c is a front view of the distal end 122 of cannula 100 in which the surgical tool 120 and the retractor 116 are partially extended, and an endoscope 126 is present.
- FIG. 4 a is a cut-away top view of cannula 100 .
- FIG. 4 b is a cut-away side view of cannula 100 .
- FIG. 5 a is a cut-away view of a sliding tube embodiment of cannula 100 in a first position.
- FIG. 5 b is a cut-away view of the sliding tube embodiment of FIG. 5 a in a second position.
- FIG. 6 a is a cut-away view of an embodiment of cannula 100 having an angling device 140 .
- FIG. 6 b is a cut-away side view of the apparatus illustrated in is actuated.
- FIG. 6 c is a cut-away side view of the angling device embodiment in which the angling device 140 is in a separate lumen from the retractor 112 .
- FIG. 7 a is a cut-away side view of a twistable retractor 112 in a straight position.
- FIG. 7 b is a side view of the retractor 112 of FIG. 7 a.
- FIG. 7 c is a cut-away side view of twistable retractor 112 in a crossed position.
- FIG. 7 d is a side view of the retractor 112 of FIG. 7 c.
- FIG. 8 a is a cut-away side view of the handle 104 .
- FIG. 8 b is a cut-away side view of an alternate embodiment of handle 104 .
- FIG. 9 a is a side view of cradle 116 .
- FIG. 9 b illustrates a first alternate embodiment of cradle 116 .
- FIG. 9 c illustrates multiple views of a second alternate embodiment of cradle 116 .
- FIG. 9 d illustrates multiple views of a third alternate embodiment of cradle 116 .
- FIG. 9 e illustrates multiple views of a fourth alternate embodiment of cradle 116 .
- FIG. 9 f illustrates multiple views of a fifth alternate embodiment of cradle 116 .
- FIG. 9 g illustrates multiple views of an embodiment of cradle 116 having a spur.
- FIG. 10 a illustrates a top view of an embodiment of the cradle 116 of FIG. 9 c without a “C” ring.
- FIG. 10 b illustrates a side view of the cradle 116 of FIG. 10 a.
- FIG. 10 c illustrates a top view of the cradle 116 of FIG. 9 c with the “C” ring attached.
- FIG. 10 d illustrates a side view of the cradle 116 of FIG. 10 c.
- FIG. 11 a illustrates a perspective side view of a cannula 100 including an irrigation system integrated with the retractor 112 .
- FIG. 11 b is a cut-away view of a retractor 112 of FIG. 11 a modified to incorporate the irrigation system.
- FIG. 11 c is a cut-away view of a modified retractor 112 and endoscope 126 situated in a cannula 100 .
- FIG. 11 d is an alternate embodiment of the cannula-based irrigation system of FIG. 11 a.
- FIG. 12 is a cut-away side view of a multi-tube embodiment of an irrigation system.
- FIG. 13 is a cut-away side view of an irrigation system including a separate lumen.
- FIG. 14 a is a perspective front view of a single leg irrigation system.
- FIG. 14 b is a perspective side view of the single leg irrigation system.
- FIG. 15 is a flowchart illustrating a method of cleansing an endoscopic lens and irrigating a surgical site in accordance with the present invention.
- FIG. 16 a is a cut-away side view of an alternate embodiment of a cannula-based irrigation system in accordance with the present invention.
- FIG. 16 b illustrates the embodiment of FIG. 16 a when the nozzle 1600 is under hydraulic pressure.
- FIG. 1 illustrates a perspective view of a preferred embodiment of cannula 100 showing retractor 112 in an extended position.
- Cannula 100 includes an outer housing 102 of bioinert material such as polymed UD that may be approximately 12′′ to 18′′ in length.
- the proximal end of the cannula 100 is disposed in handle 104 that includes a button 106 which is coupled to retractor 112 for controlling the translational movement of retractor 112 , as described in more detail below.
- FIG. 2 a illustrates the retractor 112 in more detail.
- retractor 112 is formed of resilient wire which has a smooth bend intermediate to a first portion 110 and a second portion 114 of the retractor.
- the retractor 112 is described as having two portions for ease of description, although the retractor 112 may be formed as an integrated structure. However, retractor 112 may also be manufactured from two separate portions 110 , 114 that are coupled together.
- the first portion 110 of the retractor 112 is positioned within the cannula 100 with the axis 111 of the first portion 110 approximately parallel to the axis 101 of the cannula 100 .
- the second portion 114 is positioned to bend away from the central axis 101 of the cannula.
- the angle 117 of displacement between the axis 115 of the second portion and the central axis 101 of cannula 100 may be any angle from zero to 180 degrees.
- the second portion 114 includes a dissection cradle 116 at the distal end of the second portion 114 .
- the retractor 112 may be formed of bioinert material such as stainless steel, or a polymer such as nylon or polyetherimide, or other appropriately strong and resilient plastic.
- the retractor 112 includes a coating for lubrication, insulation, and low visual glare using, for example, parylene or nylon 11.
- FIG. 2 b illustrates the retractor 112 formed with two legs.
- the legs 141 , 142 of the retractor 112 at the distal end form the dissection cradle 116 in a loop or “U” shape, as shown in FIG. 2 a.
- the top portion 144 of the U-shaped bend is preferably flattened to provide additional surface area for atraumatically supporting a vein 118 or vessel of interest.
- the side arches 128 of the dissection cradle 116 are used for skeletonizing or dissecting the vein from the surrounding tissues, as well as acting as walls to keep the vessel captured within the arch.
- the several embodiments of dissection cradle 116 are described in more detail below.
- FIG. 3 a illustrates a perspective view of the cannula 100 in accordance with the present invention with the retractor fully extended, holding a saphenouss vein 118 , and also illustrates an external surgical tool 120 disposed adjacent the cannula 100 for performing a surgical operation, for example, severing a tributary or side branch of the vein 118 .
- the vein is positioned within the side arches 128 of the cradle 116 .
- the dissection cradle 116 may be used to cradle a vein, vessel, tissue or organ of interest, and surgical tool 120 may be any surgical tool suitable for performing a surgical procedure near the dissection cradle 116 .
- FIG. 3 b illustrates a perspective view of cannula 100 in an embodiment in which the surgical tool 120 is positioned within the cannula 100 , and an endoscope 126 is present.
- cradle 116 preferably overlays the endoscope 126 with sufficient clearance to facilitate relative movements thereof.
- the endoscope may also be located adjacent the surgical tool 120 .
- endoscope 126 is positioned with cannula 100 to allow a clear field of view upon extension of the retractor 112 .
- Surgical tool 120 is illustrated as cauterizing scissors, used to sever a tributary or side branch of a saphenouss vein 118 .
- surgical tool 120 is maximally displaced from the cradle 116 at the cannula end 122 . More specifically, as shown in FIG. 3 c, the “U”-shaped loop 129 of the cradle 116 is closest to the surgical tool 120 . This ensures that a vein 118 or other tissue of interest is retracted away from the surgical tool 120 to facilitate manipulating the surgical tool 120 relative to the side branch or other tissue.
- FIG. 4 a is a cut-away top view of cannula 100 .
- the retractor 112 is slidably positioned within minor lumens 113 along the length of the cannula 100 within close tolerances in order to position the retractor 112 stably within the cannula 100 .
- retractor legs 141 , 142 are approximately 0.045 inches in diameter and the lumens 113 encasing the legs 141 , 142 are approximately 0.080 inches in diameter, as friction between the legs of the retractor 112 and the lumens 113 holds the retractor stably within the cannula.
- This configuration restricts rotational movement of the retractor to provide more stable retraction as compared with conventional retractors.
- the legs 141 , 142 of the retractor 112 are formed of flexible, resilient material and are retained within the lumen 113 in substantially straight or flat orientation, but may return to a material bend or curve, as illustrated in FIG. 5 a, as the retractor 112 is extended from the distal end of the cannula 100 .
- the leg 141 of the retractor 112 passes through a sliding gas or fluid seal 130 at the proximal end of the lumen 113 .
- the leg 141 of the retractor 112 passes out of the cannula 100 and into handle 104 for attachment to a slider button 106 for facilitating translational movement of the retractor 112 from the proximal or handle end of the cannula 100 .
- other types of control devices such as knobs, grips, finger pads, and the like may be linked in conventional ways to the retractor 112 in order to manually control the translational movement of retractor 112 .
- the proximal end of leg 141 is bent relative to the axis of the cannula, and the button 106 is attached to the bent position of the leg 141 to facilitate moving the button 106 and the retractor 112 translationally under manual control.
- the button 106 preferably includes lateral grooves to prevent finger or thumb slippage during sliding manipulation of the retractor 112 .
- a user actuates the slider button 106 to extend retractor 112 out of the lumen 113 at the distal end of the cannula 100 .
- the resilient retractor 112 is formed in a smooth bend, as shown in FIG. 2 a, and gradually deflects away from the central axis 101 of the cannula 100 as the retractor is extended.
- the vessel Upon encountering the target vessel or tissue of interest, the vessel is restrained in the cradle 116 , and a lateral resilient force is exerted on the target vessel in a direction away from the cannula.
- the vessel is thus pushed away from the axis of the cannula 100 , isolating it from surrounding tissue or adjacent vessels such as tributaries or side branches.
- a surgical tool 120 such as cauterizing scissors may be safely employed to operate on the tributary without harming the saphenouss vein 118 .
- the retractor 112 is again resiliently straightened or flattened.
- a sliding tube 132 is added to provide operational versatility to cannula 100 .
- the sliding tube 132 In a first position, the sliding tube 132 is retracted and the retractor 112 protrudes from the distal end at an angle with respect to the central axis 101 of the cannula 100 .
- the sliding tube 132 In a second position, the sliding tube 132 is extended out, temporarily straightening the retractor 112 . As illustrated in FIG.
- a sliding tube 132 in a first position encases the retractor 112 up to the point at which the retractor 112 curves away from the central axis 101 of the cannula thus allowing the retractor 112 to displace and isolate a target vessel.
- the proximal end of the sliding tube 132 is linked to button 107 for translationally moving retractor 112 as well as actuating the sliding tube 132 .
- the sliding tube 132 is in a first position with the button 107 in an upright position.
- a spring 134 is coupled between a support structure 135 and the proximal end 137 of the sliding tube 132 . In the first position of sliding tube 132 , the spring 134 is extended fully and exerts little or no force on the sliding tube 132 .
- sliding tube 132 may be manually manipulated without linkage to a button 107 .
- button 107 is pushed down. As illustrated in FIG. 5 b, the button 107 has a cam surface 136 which pushes on the proximal end 137 of the sliding tube 132 as the button 107 is pressed.
- the sliding tube 132 is pushed forward, overcoming the resilient force of spring 134 , to encase the retractor 112 and decrease angle 117 between the distal end of the retractor 112 and the central axis 101 of the cannula 100 .
- the spring force urges the proximal end 137 of the sliding tube 132 back toward the first position against button 107 .
- the sliding tube 132 is formed of material having sufficient strength to force the retractor 112 to straighten out the angle 117
- the retractor 112 is formed of resilient material having a sufficient flexibility to straighten out the angle 117 in response to a tube 132 being slid over the retractor 112 , but having sufficient rigidity to cradle and dissect a target vessel. Resiliency of the retractor 112 ensures return to the downwardly-curved shape after being released from tube 132 .
- a manual actuator may be configured in other ways than button 107 to extend the sliding tube 132 in response, for example, to being pulled up instead of pushed down.
- FIGS. 6 a and 6 b Another embodiment employs a retractor 112 which has a naturally straight shape.
- an angling device 140 is disposed between the distal end of the retractor 112 and the proximal end of the cannula.
- the angling device 140 may be positioned within the same lumens 113 as the retractor 112 and preferably may comprise two wires coupled to points below the cradle 116 of the retractor 112 substantially in parallel positions on each of the legs 141 , 142 .
- the angling device 140 Upon extending the retractor 112 using button 106 , the angling device 140 is extended with the retractor 112 .
- the angling device 140 is coupled to a handle 145 at the proximal end of the cannula 100 to facilitate establishing an angle in the retractor 112 by pulling with a backward force on the angling device 140 .
- the angling device 140 is actuated and a bend is created in the retractor 112 as the backward force exerted on the distal end of the retractor is exerted against the relatively fixed position of the retractor legs 141 , 142 disposed within the lumens 113 .
- the angling device 140 may also be located in a separate lumen 202 from the retractor 112 with part of the angling device 140 positioned outside of the cannula 100 when the retractor 112 is in the retracted position.
- FIG. 7 a illustrates another embodiment of cannula 100 in which the retractor 112 is pre-formed with one leg 141 of the retractor 112 bent at an angle at its proximal end skewed to the axis of the distal end of the other leg 142 .
- the bent portion of the leg 141 may be linked to a sliding knob 147 for convenient manual manipulation of this embodiment of the invention.
- the knob 147 Upon sliding the knob 147 , the leg 142 coupled to knob 147 is twisted rotationally.
- the two legs 141 , 142 of retractor 112 are coupled together via cradle 116 .
- the axis of the second portion of the retractor 112 in the first position is at a first angle 117 to the axis of the cannula 100 , as shown in FIG. 7 b.
- leg 141 is rotated and crosses under leg 142 , as shown in FIG. 7 c.
- This causes cradle 116 to flip 180 degrees and bends the retractor 112 at a second angle 119 , as shown in FIG. 7 d.
- the vessel is transported to the other side of the cannula 100 . This allows the user to isolate the vessel by simply actuating knob 147 .
- FIG. 8 a illustrates a cut-away side view of button 106 on the handle 104 of cannula 100 , with an endoscope 126 positioned within cannula 100 .
- button 106 is coupled to one leg 141 of the proximal end of retractor 112 . Sliding the button 106 in groove 146 translationally moves the retractor 112 .
- Groove 146 is preferably minimally wider than the shaft of button 106 to minimize excessive horizontal movement of button 106 while still allowing smooth translational movement of button 106 . As illustrated in FIG.
- the button 106 may include locking or ratcheting teeth 152 to give tactile feedback of its location, and to positively retain the button and the associated leg 141 in an extended or retracted position.
- Several mating teeth 148 are located underneath groove 146 , and a spring member 150 is attached to button 106 to exert pressure against the base of groove 146 , to engage mating teeth 148 , 152 .
- the interlocking sets of teeth are disengaged and button 106 can move freely.
- button 106 is released and is retained place by the engaged teeth 148 , 152 .
- FIG. 9 a illustrates a top view of cradle 116 in an embodiment in which the cradle 116 is formed by two legs 141 , 142 of retractor 112 .
- the distal end of the legs form “U”-shaped side guides.
- the top 144 of the distal portion of the “U” is preferably flattened. This provides atraumatic support for the target vessel retained within cradle 116 . Additionally, by minimizing the thickness of distal portion 144 , contact with other devices in close proximity with retractor 112 is minimized.
- the cradle 116 may have other effective shapes, for example, as illustrated in FIG. 9 b in which a “C” ring element is attached to legs of the cradle 116 .
- the “C” ring may have a small hole 200 in one side with an axis approximately parallel to the axis of the retractor 112 . This hole 200 is used to hold suture or other ligating materials, and may also be used as a knot pusher.
- FIGS. 10 a and 10 b in an alternate embodiment of the embodiment of FIG.
- the retractor 112 is formed and flattened and a “C”-shaped ring is coupled to the retractor 112 by, for example, gluing or molding the “C” ring to the distal end of the retractor 112 , as shown in FIGS. 10 c and 10 d.
- the side guides of the cradle may include a loop 129 in a “V” shape, an arced “U” shape, or a semi-circular shape.
- the retractor 112 has only one leg 141 , and the cradle 116 is formed by the leg 141 .
- a stopper 160 is coupled to the end of the leg 141 to serve as a guide to retain the target vessel, and add a blunt surface to the end of the wire, for example, for pushing and probing tissue.
- 9 g illustrates a retractor 112 having a spur 204 formed in one or both legs 141 , 142 for allowing the retractor 112 to be used for dissection.
- Sinusoidal, half-sinusoidal, and other geometric configurations may be used equally effectively as the shape of loop 129 in accordance with the present invention.
- FIG. 11 a illustrates a perspective side view of a cannula 100 and an irrigation effector 1150 for cleaning an endoscope lens 1108 and wetting a surgical site.
- the irrigation effector is retractor 112 .
- the retractor 112 extends distal to the tip of the cannula 100 responsive to activation of a control button 106 .
- two supporting members 1100 , 141 attach to the dissection cradle 116 and allow it to extend and retract.
- one supporter or leg 1100 is hollow, functioning as a lumen to carry irrigation fluid for cleaning an endoscope lens 1108 (shown in FIG. 11 c ).
- An irrigation nozzle 1104 is disposed on the cradle 116 or on the distal portion of the hollow leg 100 and is configured to spray irrigation fluid at the endoscopic lens 1108 .
- the irrigation fluid is received from a fluid source which conducts the fluid under pressure to the leg 1100 .
- the irrigation nozzle 1104 is directed toward the lens 1108 of the endoscope 126 at an angle approximately normal to the endoscope lens 1108 , allowing a spray of irrigation fluid to contact the surface of the lens 1108 and clean the lens 1108 effectively .
- the surgeon is able to view the source of the spray through the endoscope 126 , and is able to adjust the angle of incidence by adjusting the extension of the retractor 112 .
- the endoscopic washing system built into the cannula 100 and into the sliding retractor 112 , a more effective cleaning system is provided than what is provided by systems which are built into the endoscope itself.
- the dissection cradle 116 is extended out of the cannula 100 , as shown in FIG. 11 a, toward the area requiring irrigation.
- the surgeon can direct a spray of irrigation fluid toward the site.
- the irrigation system of the present invention can both wash the endoscope lens 1108 and irrigate a remote surgical site.
- the hollow leg 1100 is situated within a lumen 1112 in the cannula body 100 .
- An extension tube (not shown) is connected to the proximal end of the lumen 1112 to provide a source of irrigation fluid under pressure, for example, via a Luer lock syringe fitting.
- the syringe is used to selectively inject fluid under pressure into the lumen 1112 upon a determination that the endoscope lens 1108 requires cleansing.
- the hollow leg 1100 may extend only a fraction of the length of the lumen 1112 within the cannula body 100 prior to coupling to irrigation fluid under pressure. However, the hollow leg 1100 should be of sufficient length to extend the cradle 116 out to its proper working distance.
- the hollow leg 1100 has an outer diameter that slip fits within the inner diameter of the cannula body lumen 1112 .
- the hollow leg 1104 has an outer diameter smaller than the inner diameter of the cannula body lumen 1112 , but has a proximal end 1120 that flares out to a slip fit within the cannula body lumen 1112 .
- FIG. 11 d illustrates an embodiment of the single-leg irrigation system in which a wire 141 is present within the hollow leg 1100 in lumen 113 .
- the presence of wire 141 provides support and rigidity to the retractor 112 while retaining the ability of the hollow leg 1100 to be used to conduct irrigation fluid to the irrigation nozzle 1104 .
- FIG. 12 is a cut-away side view of a multi-tube embodiment of a cannula-based irrigation system.
- the hollow leg 1200 includes a semi-rigid flexible tube or the like, and extends approximately one quarter to one third of the length of the cannula body 100 within a second irrigation tube 1204 inside of the cannula body lumen 1112 .
- a fluid input tube 1208 of flexible plastic attaches to the proximal end of the irrigation tube 1204 and extends out of the cannula handle 104 .
- the proximal end of the fluid input tube 1208 may include a valved Luer lock fitting 1212 for connection to a source of irrigation fluid such as provided by a syringe by selective applications of pressure.
- the first tube 1200 is slidable within the irrigation tube 1204 to form an adequate sliding fluid seal between the moving parts.
- FIG. 13 is a cut-away side view of a separate lumen irrigation system.
- the cannula 100 contains a separate irrigation lumen in the cannula body.
- the lumen ends in a spray nozzle 1300 on the distal tip of the cannula 100 .
- the tip of the nozzle 1300 is approximately parallel to the lens 1108 .
- Cleansing is accomplished by applying spraying irrigation fluid across the lens 1108 to wash the lens 1108 .
- the irrigation fluid is supplied to the irrigation lumen by a fluid input tube 1208 as described above in FIG. 12, and the proximal end of the fluid tube 1208 may be attached to a syringe as a source of the irrigation fluid under selective pressurization.
- the syringe may be removeably attached to the cannula handle 104 to prevent the syringe from moving or dangling from the handle 104 , and obtruding on manipulation of the cannula 100 during vessel harvesting.
- FIG. 14 a is a perspective front view of a single leg irrigation system and shows the distal end of the cannula 100 housing the cradle 116 and the endoscope 126 .
- the dissection cradle 116 is supported by one leg 141 (shown in FIG. 11 b ) within a first lumen 1408 within the cannula body 100 , and a cannula body lumen 1412 not occupied by the second leg of the cradle 116 , as in embodiments previously described, is fitted with a nozzle 1400 which sprays the endoscope lens 1108 .
- the spray nozzle 1400 is directed at an angle at which the endoscope lens 1108 can be sprayed directly and effectively for cleaning.
- FIG. 14 b is a perspective side view of the single leg irrigation system and shows the distal end of the cannula 100 and the location of the spray nozzle 1400 .
- FIG. 15 is a flowchart illustrating a method for washing an endoscopic lens 1108 and remote surgical site in accordance with the present invention.
- skin is incised 1500 at an area near a target vessel.
- the device is advanced 1504 under endoscopic visualization toward the surgical site. If the surgeon determines 1506 that the surgical site has been reached, then the surgeon determines 1520 whether the surgical site requires irrigation. If the surgical site requires irrigation, the surgeon extends 1524 the retractor 112 toward the surgical site and activates 1528 the irrigation system to wet the surgical site. The surgeon determines 1532 whether the site is sufficiently wet by viewing the site through the endoscope 126 . If the site is sufficiently wet, the process ends. If the site requires more irrigation, the surgeon positions 1536 the retractor 112 under endoscopic visualization to direct the spray more accurately at the surgical site.
- the surgeon determines 1508 whether the lens 1108 is clean.
- the irrigation system is activated 1512 in situ to wash the lens 1108 .
- the retractor 112 is extended until the angle of the spray is approximately normal to the surface of the endoscopic lens 1108 , and therefore effectively washes the lens 1108 .
- the surgeon determines 1514 whether the lens 1108 has been cleaned satisfactorily. If not, the retractor and thereby the irrigation nozzle 1104 is selectively positioned 1516 via extension or retraction of the retractor 112 under endoscopic visualization to direct the spray toward the lens 1108 at a more effective angle. The surgeon can continue to reposition the retractor 112 until the spray nozzle is directed at an effective angle toward the lens 1108 .
- FIG. 16 a shows a cut-away side view of another embodiment of a cannula-based irrigation system.
- a nozzle tube 1600 is extendable from within a lumen 113 in the cannula 100 .
- the proximal end of the nozzle tube 1600 is attached to a distal end of a tension spring 1604 , whose proximal end is stably attached on the side of the lumen 113 or at the proximal end of the cannula 100 .
- the tension spring 1604 biases the nozzle tube 1600 in a retracted state.
- the liquid pushes the nozzle tube 1600 out of the lumen to a point slightly beyond the endoscope lens 1108 .
- the liquid flows inside the nozzle tube 1600 and exits out the spray hole 1608 , spraying irrigation fluid back towards the endoscope lens 1108 .
- the irrigation systems described above provide an effective method of cleaning an endoscope lens 1108 without requiring the removal of the endoscope from a surgical site. Additionally, the washing system described above is more effective due to the use of a spray nozzle external to the endoscope, which allows the angle of spray to be directly projected against the endoscope lens 1108 .
- the irrigation nozzle 1104 is disposed on the cradle 116 or on the hollow leg 1100 , a surgeon can visually adjust the angle of incidence of the spray, and can also irrigate a surgical site by adjusting the extension of the retractor 112 out of the cannula 100 .
Abstract
A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a dissection cradle that is resiliently supported along an axis skewed relative to the axis of the cannula. The dissection cradle, in operation, is extended to cradle the target vessel, and the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate a side branch for exposure to a surgical tool. The retractor includes a hollow support and a spray nozzle disposed in the distal end of the retractor to form an irrigation system and lens washer that can be selectively positioned to direct the spray of irrigation fluid at a remote surgical site or at an endoscopic lens.
Description
- This application is a continuation of application Ser. No. 09/634,132, filed on Aug. 8, 2000 which is a continuation of application Ser. No. 09/227,244 filed on Jan. 8, 1999, now issued as U.S. Pat. No. 6,176,825, which is a continuation-in-part application of application Ser. No. 09/102,723 filed on Jun. 22, 1998, now issued as U.S. Pat. No. 5,895,353.
- This invention relates to a cannula used for endoscopic surgery, and more particularly to a cannula and method for maintaining a clear visual field for an endoscope housed with the cannula.
- Endoscopic surgery allows a surgeon to perform safe and successful procedures because of the surgeon's ability to view the surgical site through the endoscope lens. For some surgical procedures, such as dissection, the cannula housing the endoscope has a transparent blunt dissection tip through which the surgeon views the surgical site. The blunt dissection tip protects the endoscope lens from being smeared by blood or fatty tissue present at the surgical site, or from being fogged due to the moist subcutaneous environment. However, many surgical procedures cannot be performed using a blunt dissection tip. When side branches and vessel ends of a vessel must be transected to harvest the vessel, the end of the cannula must be open to allow the surgical tools to extend from the cannula. When the cannula end is open, the endoscope lens is subject to the adverse conditions described above. The surgeon is forced to repeatedly remove the cannula from the body to clean the endoscope lens. This increases the length and risks of the operation.
- Some conventional schemes for cleaning an endoscope lens rely upon an endoscope with a cleaning system built within it. However, having a cleaning system within the endoscope restricts the angle of incidence at which the cleaning fluid may be propelled toward the lens to almost parallel to the lens. This results in a less effective cleansing action. Also, since the spray is being directed parallel to the lens, the surgeon cannot see the spray source and it is therefore difficult to adjust the direction of the spray. Tilus, with these systems, the endoscope must still be removed on occasion for manual cleaning where the, proper angle of incident spray can be obtained manually. Additionally, in procedures using gas insufflation, the gas may dry out a target vessel or other surgical site. In these situations, it is often necessary to irrigate the vessel to prevent the vessel from drying out. However, conventional endoscope washing systems are not capable of providing both endoscope lens cleaning and remote surgical site irrigation. Therefore, a remote endoscopic washing system would be desirable for more effectively cleansing the endoscope lens during a surgical procedure by allowing the surgeon to control the angle at which cleansing fluid is sprayed as well as allowing the surgeon to use the same apparatus to irrigate the surgical site itself.
- In accordance with the present invention, a retractor is positioned within a cannula with a dissection cradle end of the retractor positioned at the distal end of the cannula. The retractor includes a first portion that has an axis approximately parallel to a central axis of the cannula, and a second portion that has an axis which is at an angle with respect to the central axis of the cannula. The dissection cradle is located at the distal end of the second portion of the retractor. In another embodiment, the retractor includes two legs having substantially parallel axes that selectively protrude from the distal end of the cannula. The protruding legs support the dissection cradle formed in the shape of a partial loop that is positioned in a plane skewed relative to the axes of the legs, with a bottom of the loop directed away from the cannula. Thus, in operation, when the surgeon locates a vein and side branch of interest, the surgeon extends the retractor to cradle the vein in the dissection cradle. Once cradled, the retractor may be fully extended, displacing the vein away from the axis of the cannula, causing the side branch to be isolated and exposed to a surgical tool. The surgical tool may then be extended from within the cannula to operate on the isolated and exposed side branch.
- In accordance with one embodiment of the present invention, a remote irrigation system is built into the cannula. In one embodiment, one of the legs which comprise the retractor of the present invention is hollow, and is attached to a spray nozzle disposed in the distal end of the retractor. The proximal end of the hollow leg is attached to a fluid input tube which selectively provides irrigation fluid under pressure for washing the endoscope lens. When extended slightly beyond the distal end of the cannula, the spray nozzle is positioned to direct the spray of irrigation fluid at an angle approximately normal to the endoscope lens. This provides for an extremely effective cleaning action, and minimizes the need for removal of the endoscope during surgical procedures for manual cleaning. Additionally, if the surgical site itself requires irrigation, the retractor is extended out of the cannula toward the area requiring irrigation, and an irrigation fluid can be sprayed directly on the site. Finally, as the spray is directed back toward the lens, the surgeon can visually adjust the extension of the retractor to accurately direct the spray toward the lens or surgical site.
- In a further embodiment, the hollow leg moves within a lumen in the cannula in fluid-resistant sliding engagement, and the fluid input tube is coupled to this lumen. In this embodiment, the maximal outer dimension of a region of the hollow leg is slightly less than a maximal inner dimension of the lumen. The slip-fit, fluid-resistant coupling of the hollow leg within the lumen allows irrigation fluid to be introduced at the proximal end of the lumen by the fluid input tube without significant leakage past the sliding juncture of the hollow leg within the lumen.
- In an alternate embodiment, the hollow leg includes a semi-rigid plastic tubing, and fits within an irrigation tube which lines the inside of the lumen. The fluid input tube attaches to the irrigation tube and extends out of the cannula handle for receiving irrigation fluid. The use of flexible, semi-rigid plastic tubes provides fluid seals throughout the irrigation system to minimize leakage. In a third embodiment, the cannula contains a separate irrigation lumen which has a spray nozzle disposed in a fixed position at its distal end. The spray nozzle is positioned within the cannula to allow the proper angle of incidence for the spray to effectively clean the lens. Finally, in another embodiment, the dissection cradle is supported by only one leg, and the lumen which previously held the second leg instead is fitted with a spray nozzle directed toward the endoscope lens. An embodiment is also disclosed in which a nozzle tube situated within a cannula lumen is selectively extensible responsive to the application of hydraulic pressure.
- FIG. 1 is a perspective view of a preferred embodiment of
cannula 100 showingretractor 112 in an extended position. - FIG. 2a is a cut-away side view of
retractor 112 andcannula 100. - FIG. 2b is a top view of
retractor 112. - FIG. 3a is a perspective side view of
cannula 100 with a saphenous vein positioned within thecradle 116. - FIG. 3b is a perspective side view of the
distal end 122 ofcannula 100 in an embodiment in which anendoscope 126 and asurgical tool 120 are present and partially extended. - FIG. 3c is a front view of the
distal end 122 ofcannula 100 in which thesurgical tool 120 and theretractor 116 are partially extended, and anendoscope 126 is present. - FIG. 4a is a cut-away top view of
cannula 100. - FIG. 4b is a cut-away side view of
cannula 100. - FIG. 5a is a cut-away view of a sliding tube embodiment of
cannula 100 in a first position. - FIG. 5b is a cut-away view of the sliding tube embodiment of FIG. 5a in a second position.
- FIG. 6a is a cut-away view of an embodiment of
cannula 100 having anangling device 140. - FIG. 6b is a cut-away side view of the apparatus illustrated in is actuated.
- FIG. 6c is a cut-away side view of the angling device embodiment in which the
angling device 140 is in a separate lumen from theretractor 112. - FIG. 7a is a cut-away side view of a
twistable retractor 112 in a straight position. - FIG. 7b is a side view of the
retractor 112 of FIG. 7a. - FIG. 7c is a cut-away side view of
twistable retractor 112 in a crossed position. - FIG. 7d is a side view of the
retractor 112 of FIG. 7c. - FIG. 8a is a cut-away side view of the
handle 104. - FIG. 8b is a cut-away side view of an alternate embodiment of
handle 104. - FIG. 9a is a side view of
cradle 116. - FIG. 9b illustrates a first alternate embodiment of
cradle 116. - FIG. 9c illustrates multiple views of a second alternate embodiment of
cradle 116. - FIG. 9d illustrates multiple views of a third alternate embodiment of
cradle 116. - FIG. 9e illustrates multiple views of a fourth alternate embodiment of
cradle 116. - FIG. 9f illustrates multiple views of a fifth alternate embodiment of
cradle 116. - FIG. 9g illustrates multiple views of an embodiment of
cradle 116 having a spur. - FIG. 10a illustrates a top view of an embodiment of the
cradle 116 of FIG. 9c without a “C” ring. - FIG. 10b illustrates a side view of the
cradle 116 of FIG. 10a. - FIG. 10c illustrates a top view of the
cradle 116 of FIG. 9c with the “C” ring attached. - FIG. 10d illustrates a side view of the
cradle 116 of FIG. 10c. - FIG. 11a illustrates a perspective side view of a
cannula 100 including an irrigation system integrated with theretractor 112. - FIG. 11b is a cut-away view of a
retractor 112 of FIG. 11a modified to incorporate the irrigation system. - FIG. 11c is a cut-away view of a modified
retractor 112 andendoscope 126 situated in acannula 100. - FIG. 11d is an alternate embodiment of the cannula-based irrigation system of FIG. 11a.
- FIG. 12 is a cut-away side view of a multi-tube embodiment of an irrigation system.
- FIG. 13 is a cut-away side view of an irrigation system including a separate lumen.
- FIG. 14a is a perspective front view of a single leg irrigation system.
- FIG. 14b is a perspective side view of the single leg irrigation system.
- FIG. 15 is a flowchart illustrating a method of cleansing an endoscopic lens and irrigating a surgical site in accordance with the present invention.
- FIG. 16a is a cut-away side view of an alternate embodiment of a cannula-based irrigation system in accordance with the present invention.
- FIG. 16b illustrates the embodiment of FIG. 16a when the
nozzle 1600 is under hydraulic pressure. - FIG. 1 illustrates a perspective view of a preferred embodiment of
cannula 100 showingretractor 112 in an extended position.Cannula 100 includes an outer housing 102 of bioinert material such as polymed UD that may be approximately 12″ to 18″ in length. The proximal end of thecannula 100 is disposed inhandle 104 that includes abutton 106 which is coupled toretractor 112 for controlling the translational movement ofretractor 112, as described in more detail below. - The distal end of the cannula houses a
retractor 112, and optionally anendoscope 126 and asurgical tool 120, described below. FIG. 2a illustrates theretractor 112 in more detail. In one embodiment,retractor 112 is formed of resilient wire which has a smooth bend intermediate to afirst portion 110 and asecond portion 114 of the retractor. Theretractor 112 is described as having two portions for ease of description, although theretractor 112 may be formed as an integrated structure. However,retractor 112 may also be manufactured from twoseparate portions first portion 110 of theretractor 112 is positioned within thecannula 100 with theaxis 111 of thefirst portion 110 approximately parallel to theaxis 101 of thecannula 100. Thesecond portion 114 is positioned to bend away from thecentral axis 101 of the cannula. Theangle 117 of displacement between theaxis 115 of the second portion and thecentral axis 101 ofcannula 100 may be any angle from zero to 180 degrees. Thesecond portion 114 includes adissection cradle 116 at the distal end of thesecond portion 114. Theretractor 112 may be formed of bioinert material such as stainless steel, or a polymer such as nylon or polyetherimide, or other appropriately strong and resilient plastic. In one embodiment, theretractor 112 includes a coating for lubrication, insulation, and low visual glare using, for example, parylene or nylon 11. - FIG. 2b illustrates the
retractor 112 formed with two legs. Thelegs retractor 112 at the distal end form thedissection cradle 116 in a loop or “U” shape, as shown in FIG. 2a. Thetop portion 144 of the U-shaped bend is preferably flattened to provide additional surface area for atraumatically supporting avein 118 or vessel of interest. Theside arches 128 of thedissection cradle 116 are used for skeletonizing or dissecting the vein from the surrounding tissues, as well as acting as walls to keep the vessel captured within the arch. The several embodiments ofdissection cradle 116 are described in more detail below. - FIG. 3a illustrates a perspective view of the
cannula 100 in accordance with the present invention with the retractor fully extended, holding asaphenouss vein 118, and also illustrates an externalsurgical tool 120 disposed adjacent thecannula 100 for performing a surgical operation, for example, severing a tributary or side branch of thevein 118. The vein is positioned within theside arches 128 of thecradle 116. Thedissection cradle 116 may be used to cradle a vein, vessel, tissue or organ of interest, andsurgical tool 120 may be any surgical tool suitable for performing a surgical procedure near thedissection cradle 116. - FIG. 3b illustrates a perspective view of
cannula 100 in an embodiment in which thesurgical tool 120 is positioned within thecannula 100, and anendoscope 126 is present. In this embodiment,cradle 116 preferably overlays theendoscope 126 with sufficient clearance to facilitate relative movements thereof. However, the endoscope may also be located adjacent thesurgical tool 120. In one embodiment,endoscope 126 is positioned withcannula 100 to allow a clear field of view upon extension of theretractor 112.Surgical tool 120 is illustrated as cauterizing scissors, used to sever a tributary or side branch of asaphenouss vein 118. In this embodiment,surgical tool 120 is maximally displaced from thecradle 116 at thecannula end 122. More specifically, as shown in FIG. 3c, the “U”-shapedloop 129 of thecradle 116 is closest to thesurgical tool 120. This ensures that avein 118 or other tissue of interest is retracted away from thesurgical tool 120 to facilitate manipulating thesurgical tool 120 relative to the side branch or other tissue. - FIG. 4a is a cut-away top view of
cannula 100. Theretractor 112 is slidably positioned withinminor lumens 113 along the length of thecannula 100 within close tolerances in order to position theretractor 112 stably within thecannula 100. For example, in oneembodiment retractor legs lumens 113 encasing thelegs retractor 112 and thelumens 113 holds the retractor stably within the cannula. This configuration restricts rotational movement of the retractor to provide more stable retraction as compared with conventional retractors. Thelegs retractor 112 are formed of flexible, resilient material and are retained within thelumen 113 in substantially straight or flat orientation, but may return to a material bend or curve, as illustrated in FIG. 5a, as theretractor 112 is extended from the distal end of thecannula 100. - The
leg 141 of theretractor 112 passes through a sliding gas orfluid seal 130 at the proximal end of thelumen 113. Theleg 141 of theretractor 112 passes out of thecannula 100 and intohandle 104 for attachment to aslider button 106 for facilitating translational movement of theretractor 112 from the proximal or handle end of thecannula 100. However, other types of control devices such as knobs, grips, finger pads, and the like may be linked in conventional ways to theretractor 112 in order to manually control the translational movement ofretractor 112. In one configuration, the proximal end ofleg 141 is bent relative to the axis of the cannula, and thebutton 106 is attached to the bent position of theleg 141 to facilitate moving thebutton 106 and theretractor 112 translationally under manual control. Thebutton 106 preferably includes lateral grooves to prevent finger or thumb slippage during sliding manipulation of theretractor 112. - Thus, in the operation of a preferred embodiment, a user actuates the
slider button 106 to extendretractor 112 out of thelumen 113 at the distal end of thecannula 100. In one embodiment, theresilient retractor 112 is formed in a smooth bend, as shown in FIG. 2a, and gradually deflects away from thecentral axis 101 of thecannula 100 as the retractor is extended. Upon encountering the target vessel or tissue of interest, the vessel is restrained in thecradle 116, and a lateral resilient force is exerted on the target vessel in a direction away from the cannula. The vessel is thus pushed away from the axis of thecannula 100, isolating it from surrounding tissue or adjacent vessels such as tributaries or side branches. As a tributary is thus isolated, asurgical tool 120 such as cauterizing scissors may be safely employed to operate on the tributary without harming thesaphenouss vein 118. When retracted into thecannula 100, theretractor 112 is again resiliently straightened or flattened. - In an alternate embodiment as illustrated in FIGS. 5a and 5 b, a sliding
tube 132 is added to provide operational versatility tocannula 100. In a first position, the slidingtube 132 is retracted and theretractor 112 protrudes from the distal end at an angle with respect to thecentral axis 101 of thecannula 100. In a second position, the slidingtube 132 is extended out, temporarily straightening theretractor 112. As illustrated in FIG. 5a, a slidingtube 132, in a first position encases theretractor 112 up to the point at which theretractor 112 curves away from thecentral axis 101 of the cannula thus allowing theretractor 112 to displace and isolate a target vessel. The proximal end of the slidingtube 132 is linked tobutton 107 for translationally movingretractor 112 as well as actuating the slidingtube 132. In one embodiment, as illustrated in FIG. 5a, the slidingtube 132 is in a first position with thebutton 107 in an upright position. Aspring 134 is coupled between asupport structure 135 and theproximal end 137 of the slidingtube 132. In the first position of slidingtube 132, thespring 134 is extended fully and exerts little or no force on the slidingtube 132. Of course, slidingtube 132 may be manually manipulated without linkage to abutton 107. - To extend the sliding
tube 100,button 107 is pushed down. As illustrated in FIG. 5b, thebutton 107 has acam surface 136 which pushes on theproximal end 137 of the slidingtube 132 as thebutton 107 is pressed. The slidingtube 132 is pushed forward, overcoming the resilient force ofspring 134, to encase theretractor 112 anddecrease angle 117 between the distal end of theretractor 112 and thecentral axis 101 of thecannula 100. Upon releasing thebutton 107, the spring force urges theproximal end 137 of the slidingtube 132 back toward the first position againstbutton 107. The slidingtube 132 is formed of material having sufficient strength to force theretractor 112 to straighten out theangle 117, and theretractor 112 is formed of resilient material having a sufficient flexibility to straighten out theangle 117 in response to atube 132 being slid over theretractor 112, but having sufficient rigidity to cradle and dissect a target vessel. Resiliency of theretractor 112 ensures return to the downwardly-curved shape after being released fromtube 132. Thus, in accordance with this embodiment, a user may employ the curved retractor for certain applications and employ the straightened form for other applications. A manual actuator may be configured in other ways thanbutton 107 to extend the slidingtube 132 in response, for example, to being pulled up instead of pushed down. - Another embodiment employs a
retractor 112 which has a naturally straight shape. As illustrated in FIGS. 6a and 6 b, anangling device 140 is disposed between the distal end of theretractor 112 and the proximal end of the cannula. Theangling device 140 may be positioned within thesame lumens 113 as theretractor 112 and preferably may comprise two wires coupled to points below thecradle 116 of theretractor 112 substantially in parallel positions on each of thelegs - Upon extending the
retractor 112 usingbutton 106, theangling device 140 is extended with theretractor 112. Theangling device 140 is coupled to ahandle 145 at the proximal end of thecannula 100 to facilitate establishing an angle in theretractor 112 by pulling with a backward force on theangling device 140. As illustrated in FIG. 6b, after theretractor 112 is extended, theangling device 140 is actuated and a bend is created in theretractor 112 as the backward force exerted on the distal end of the retractor is exerted against the relatively fixed position of theretractor legs lumens 113. As shown in FIG. 6c, theangling device 140 may also be located in aseparate lumen 202 from theretractor 112 with part of theangling device 140 positioned outside of thecannula 100 when theretractor 112 is in the retracted position. - FIG. 7a illustrates another embodiment of
cannula 100 in which theretractor 112 is pre-formed with oneleg 141 of theretractor 112 bent at an angle at its proximal end skewed to the axis of the distal end of theother leg 142. The bent portion of theleg 141 may be linked to a sliding knob 147 for convenient manual manipulation of this embodiment of the invention. Upon sliding the knob 147, theleg 142 coupled to knob 147 is twisted rotationally. The twolegs retractor 112 are coupled together viacradle 116. The axis of the second portion of theretractor 112 in the first position is at afirst angle 117 to the axis of thecannula 100, as shown in FIG. 7b. As knob 147 is moved,leg 141 is rotated and crosses underleg 142, as shown in FIG. 7c. This causescradle 116 to flip 180 degrees and bends theretractor 112 at asecond angle 119, as shown in FIG. 7d. Thus, if a vessel is disposed on one side ofcradle 116 orcannula 100 while theretractor 112 is in the first position, then upon rotating the knob 147, the vessel is transported to the other side of thecannula 100. This allows the user to isolate the vessel by simply actuating knob 147. - FIG. 8a illustrates a cut-away side view of
button 106 on thehandle 104 ofcannula 100, with anendoscope 126 positioned withincannula 100. As mentioned above,button 106 is coupled to oneleg 141 of the proximal end ofretractor 112. Sliding thebutton 106 ingroove 146 translationally moves theretractor 112.Groove 146 is preferably minimally wider than the shaft ofbutton 106 to minimize excessive horizontal movement ofbutton 106 while still allowing smooth translational movement ofbutton 106. As illustrated in FIG. 8b, thebutton 106 may include locking or ratchetingteeth 152 to give tactile feedback of its location, and to positively retain the button and the associatedleg 141 in an extended or retracted position.Several mating teeth 148 are located underneathgroove 146, and aspring member 150 is attached tobutton 106 to exert pressure against the base ofgroove 146, to engagemating teeth button 106, the interlocking sets of teeth are disengaged andbutton 106 can move freely. Upon achieving the desired extension or retraction of theleg 141,button 106 is released and is retained place by the engagedteeth - FIG. 9a illustrates a top view of
cradle 116 in an embodiment in which thecradle 116 is formed by twolegs retractor 112. The distal end of the legs form “U”-shaped side guides. The top 144 of the distal portion of the “U” is preferably flattened. This provides atraumatic support for the target vessel retained withincradle 116. Additionally, by minimizing the thickness ofdistal portion 144, contact with other devices in close proximity withretractor 112 is minimized. - The
cradle 116 may have other effective shapes, for example, as illustrated in FIG. 9b in which a “C” ring element is attached to legs of thecradle 116. The “C” ring may have asmall hole 200 in one side with an axis approximately parallel to the axis of theretractor 112. Thishole 200 is used to hold suture or other ligating materials, and may also be used as a knot pusher. As shown in FIGS. 10a and 10 b, in an alternate embodiment of the embodiment of FIG. 9b, theretractor 112 is formed and flattened and a “C”-shaped ring is coupled to theretractor 112 by, for example, gluing or molding the “C” ring to the distal end of theretractor 112, as shown in FIGS. 10c and 10 d. - Referring back to FIGS. 9c, 9 d, and 9 e, the side guides of the cradle may include a
loop 129 in a “V” shape, an arced “U” shape, or a semi-circular shape. In one embodiment, as illustrated in FIG. 9f, theretractor 112 has only oneleg 141, and thecradle 116 is formed by theleg 141. Astopper 160 is coupled to the end of theleg 141 to serve as a guide to retain the target vessel, and add a blunt surface to the end of the wire, for example, for pushing and probing tissue. FIG. 9g illustrates aretractor 112 having aspur 204 formed in one or bothlegs retractor 112 to be used for dissection. Sinusoidal, half-sinusoidal, and other geometric configurations may be used equally effectively as the shape ofloop 129 in accordance with the present invention. - FIG. 11a illustrates a perspective side view of a
cannula 100 and anirrigation effector 1150 for cleaning anendoscope lens 1108 and wetting a surgical site. In the embodiment of FIG. 11a, the irrigation effector isretractor 112. As described above, theretractor 112 extends distal to the tip of thecannula 100 responsive to activation of acontrol button 106. In one embodiment, two supportingmembers dissection cradle 116 and allow it to extend and retract. As shown in FIG. 11b, one supporter orleg 1100 is hollow, functioning as a lumen to carry irrigation fluid for cleaning an endoscope lens 1108 (shown in FIG. 11c). Anirrigation nozzle 1104 is disposed on thecradle 116 or on the distal portion of thehollow leg 100 and is configured to spray irrigation fluid at theendoscopic lens 1108. The irrigation fluid is received from a fluid source which conducts the fluid under pressure to theleg 1100. When theretractor 116 is slightly extended out of the distal end of thecannula 100, theirrigation nozzle 1104 is directed toward thelens 1108 of theendoscope 126 at an angle approximately normal to theendoscope lens 1108, allowing a spray of irrigation fluid to contact the surface of thelens 1108 and clean thelens 1108 effectively . Additionally, as the spray is directed back toward theendoscope 126, the surgeon is able to view the source of the spray through theendoscope 126, and is able to adjust the angle of incidence by adjusting the extension of theretractor 112. Thus, by having the endoscopic washing system built into thecannula 100 and into the slidingretractor 112, a more effective cleaning system is provided than what is provided by systems which are built into the endoscope itself. - If the surgical site requires irrigation, the
dissection cradle 116 is extended out of thecannula 100, as shown in FIG. 11a, toward the area requiring irrigation. Upon reaching the site under endoscopic visualization, the surgeon can direct a spray of irrigation fluid toward the site. Again, if the site is not properly irrigated, the surgeon can adjust the positioning of theretractor 112 until the spray has contacted the surgical site. Thus, the irrigation system of the present invention can both wash theendoscope lens 1108 and irrigate a remote surgical site. - As shown in FIG. 11c, the
hollow leg 1100 is situated within alumen 1112 in thecannula body 100. An extension tube (not shown) is connected to the proximal end of thelumen 1112 to provide a source of irrigation fluid under pressure, for example, via a Luer lock syringe fitting. The syringe is used to selectively inject fluid under pressure into thelumen 1112 upon a determination that theendoscope lens 1108 requires cleansing. Thehollow leg 1100 may extend only a fraction of the length of thelumen 1112 within thecannula body 100 prior to coupling to irrigation fluid under pressure. However, thehollow leg 1100 should be of sufficient length to extend thecradle 116 out to its proper working distance. To minimize leakage of irrigation fluid, thehollow leg 1100 has an outer diameter that slip fits within the inner diameter of thecannula body lumen 1112. Alternatively, as shown in FIG. 11d, thehollow leg 1104 has an outer diameter smaller than the inner diameter of thecannula body lumen 1112, but has aproximal end 1120 that flares out to a slip fit within thecannula body lumen 1112. These relative dimensions allow irrigation fluid to be dispensed through thecannula body lumen 1112, into thehollow leg 1100 and out theirrigation nozzle 1104 without significant leakage past thehollow leg 1100. - FIG. 11d illustrates an embodiment of the single-leg irrigation system in which a
wire 141 is present within thehollow leg 1100 inlumen 113. The presence ofwire 141 provides support and rigidity to theretractor 112 while retaining the ability of thehollow leg 1100 to be used to conduct irrigation fluid to theirrigation nozzle 1104. - FIG. 12 is a cut-away side view of a multi-tube embodiment of a cannula-based irrigation system. In this embodiment, the
hollow leg 1200 includes a semi-rigid flexible tube or the like, and extends approximately one quarter to one third of the length of thecannula body 100 within asecond irrigation tube 1204 inside of thecannula body lumen 1112. Afluid input tube 1208 of flexible plastic attaches to the proximal end of theirrigation tube 1204 and extends out of thecannula handle 104. The proximal end of thefluid input tube 1208 may include a valved Luer lock fitting 1212 for connection to a source of irrigation fluid such as provided by a syringe by selective applications of pressure. Thefirst tube 1200 is slidable within theirrigation tube 1204 to form an adequate sliding fluid seal between the moving parts. - FIG. 13 is a cut-away side view of a separate lumen irrigation system. In this embodiment, the
cannula 100 contains a separate irrigation lumen in the cannula body. The lumen ends in aspray nozzle 1300 on the distal tip of thecannula 100. The tip of thenozzle 1300 is approximately parallel to thelens 1108. Cleansing is accomplished by applying spraying irrigation fluid across thelens 1108 to wash thelens 1108. The irrigation fluid is supplied to the irrigation lumen by afluid input tube 1208 as described above in FIG. 12, and the proximal end of thefluid tube 1208 may be attached to a syringe as a source of the irrigation fluid under selective pressurization. The syringe may be removeably attached to the cannula handle 104 to prevent the syringe from moving or dangling from thehandle 104, and obtruding on manipulation of thecannula 100 during vessel harvesting. - FIG. 14a is a perspective front view of a single leg irrigation system and shows the distal end of the
cannula 100 housing thecradle 116 and theendoscope 126. In this embodiment, thedissection cradle 116 is supported by one leg 141 (shown in FIG. 11b) within afirst lumen 1408 within thecannula body 100, and acannula body lumen 1412 not occupied by the second leg of thecradle 116, as in embodiments previously described, is fitted with anozzle 1400 which sprays theendoscope lens 1108. Thespray nozzle 1400 is directed at an angle at which theendoscope lens 1108 can be sprayed directly and effectively for cleaning. FIG. 14b is a perspective side view of the single leg irrigation system and shows the distal end of thecannula 100 and the location of thespray nozzle 1400. - FIG. 15 is a flowchart illustrating a method for washing an
endoscopic lens 1108 and remote surgical site in accordance with the present invention. First, skin is incised 1500 at an area near a target vessel. Next, the device is advanced 1504 under endoscopic visualization toward the surgical site. If the surgeon determines 1506 that the surgical site has been reached, then the surgeon determines 1520 whether the surgical site requires irrigation. If the surgical site requires irrigation, the surgeon extends 1524 theretractor 112 toward the surgical site and activates 1528 the irrigation system to wet the surgical site. The surgeon determines 1532 whether the site is sufficiently wet by viewing the site through theendoscope 126. If the site is sufficiently wet, the process ends. If the site requires more irrigation, thesurgeon positions 1536 theretractor 112 under endoscopic visualization to direct the spray more accurately at the surgical site. - If the surgical site has not been reached, the surgeon determines1508 whether the
lens 1108 is clean. In response to thelens 1108 becoming obscured with blood, fatty tissue, or the like, the irrigation system is activated 1512 in situ to wash thelens 1108. In one embodiment as described above, theretractor 112 is extended until the angle of the spray is approximately normal to the surface of theendoscopic lens 1108, and therefore effectively washes thelens 1108. Next, the surgeon determines 1514 whether thelens 1108 has been cleaned satisfactorily. If not, the retractor and thereby theirrigation nozzle 1104 is selectively positioned 1516 via extension or retraction of theretractor 112 under endoscopic visualization to direct the spray toward thelens 1108 at a more effective angle. The surgeon can continue to reposition theretractor 112 until the spray nozzle is directed at an effective angle toward thelens 1108. - FIG. 16a shows a cut-away side view of another embodiment of a cannula-based irrigation system. In this embodiment, a
nozzle tube 1600 is extendable from within alumen 113 in thecannula 100. The proximal end of thenozzle tube 1600 is attached to a distal end of atension spring 1604, whose proximal end is stably attached on the side of thelumen 113 or at the proximal end of thecannula 100. Thetension spring 1604 biases thenozzle tube 1600 in a retracted state. Upon exposure to hydraulic water pressure, as shown in FIG. 16b, the liquid pushes thenozzle tube 1600 out of the lumen to a point slightly beyond theendoscope lens 1108. The liquid flows inside thenozzle tube 1600 and exits out thespray hole 1608, spraying irrigation fluid back towards theendoscope lens 1108. - Thus, the irrigation systems described above provide an effective method of cleaning an
endoscope lens 1108 without requiring the removal of the endoscope from a surgical site. Additionally, the washing system described above is more effective due to the use of a spray nozzle external to the endoscope, which allows the angle of spray to be directly projected against theendoscope lens 1108. In an embodiment in which theirrigation nozzle 1104 is disposed on thecradle 116 or on thehollow leg 1100, a surgeon can visually adjust the angle of incidence of the spray, and can also irrigate a surgical site by adjusting the extension of theretractor 112 out of thecannula 100.
Claims (6)
1. Surgical apparatus comprising:
an elongated cannula having an elongated axis between distal and proximal ends, and including an endoscope lumen extending between the digital as proximal ends for slidably receiving an endoscope therein;
an instrument lumen extending between distal and proximal ends of the cannula in substantial diametric orientation therein; and
an auxiliary lumen extending between distal and proximal ends of the cannula in substantially orthogonal orientation therein relative to the diametric orientation of the endoscope lumen and instrument lumen.
2. Surgical apparatus according to claim 1 including a pair of auxiliary lumens extending between distal and proximal ends of the cannula in substantially diametric orientation on opposite side of, and in skewed relation to, the diametric orientation of the endoscope lumen and instrument lumen.
3. Surgical apparatus according to claim 2 including elongated supports slidably disposed in the pair of auxiliary lumens to selectively extend beyond the distal end of the cannula, and including a vessel cradle mounted to traverse the distal ends of the elongated supports.
4. Surgical apparatus according to claim 3 in which the vessel cradle includes a substantially U-shaped transverse segment between the elongated supports for positioning about the distal end of an endoscope received in the endoscope lumen.
5. Surgical apparatus according to claim 3 including a manual control element attached to an elongated support and disposed for manually activated sliding movement thereof near the proximal end of the cannula.
6. Surgical apparatus according to claim 5 including a resilient elongated support attached to the manual control element for sliding movement thereof near the proximal end of the cannula along a direction skewed relative to the elongated axis of the cannula.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US10/174,404 US20020183593A1 (en) | 1998-06-22 | 2002-06-17 | Cannula-based surgical instrument and method |
US10/773,770 US6976957B1 (en) | 1998-06-22 | 2004-02-06 | Cannula-based surgical instrument and method |
US10/925,536 US7476198B1 (en) | 1998-06-22 | 2004-08-24 | Cannula-based surgical instrument |
US12/333,542 US7867163B2 (en) | 1998-06-22 | 2008-12-12 | Instrument and method for remotely manipulating a tissue structure |
US12/983,867 US20120010463A1 (en) | 1998-06-22 | 2011-01-03 | Instrument and method for remotely manipulating a tissue structure |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US09/102,723 US5895353A (en) | 1998-06-22 | 1998-06-22 | Vessel isolating retractor cannula and method |
US09/227,244 US6176825B1 (en) | 1998-06-22 | 1999-01-08 | Cannula-based irrigation system and method |
US09/634,132 US6406425B1 (en) | 1998-06-22 | 2000-08-08 | Cannula-based irrigation system and method |
US10/174,404 US20020183593A1 (en) | 1998-06-22 | 2002-06-17 | Cannula-based surgical instrument and method |
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US09/634,132 Continuation US6406425B1 (en) | 1998-06-22 | 2000-08-08 | Cannula-based irrigation system and method |
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US10/773,770 Continuation US6976957B1 (en) | 1998-06-22 | 2004-02-06 | Cannula-based surgical instrument and method |
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US10/174,404 Abandoned US20020183593A1 (en) | 1998-06-22 | 2002-06-17 | Cannula-based surgical instrument and method |
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