US20020161384A1 - Ablation assembly with elastomeric driveshaft connection - Google Patents
Ablation assembly with elastomeric driveshaft connection Download PDFInfo
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- US20020161384A1 US20020161384A1 US09/846,055 US84605501A US2002161384A1 US 20020161384 A1 US20020161384 A1 US 20020161384A1 US 84605501 A US84605501 A US 84605501A US 2002161384 A1 US2002161384 A1 US 2002161384A1
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- Prior art keywords
- tube
- driveshaft
- drive assembly
- proximal end
- elastomeric plug
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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
- A61B17/32—Surgical cutting instruments
- A61B17/3205—Excision instruments
- A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
- A61B17/320758—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions with a rotating cutting instrument, e.g. motor driven
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00477—Coupling
Definitions
- This invention relates to a method and apparatus for ablating unwanted material from a patient's vasculature, and more particularly, to rotational ablation atherectomy devices.
- vascular diseases such as atherosclerosis and the like, have become quite prevalent in the modern day. These diseases may manifest themselves in a number of ways, often requiring different forms or methods of treatment for curing or mitigating the adverse effects of the diseases.
- vascular diseases may take the form of deposits or growths in a patient's vasculature which restrict, in the case of a partial occlusion, or, stop, in the case of a total occlusion, blood flow to a certain portion of the patient's body. This can be particularly serious if, for example, such an occlusion occurs in a portion of the vasculature that supplies vital organs with blood or other necessary fluids.
- Atherectomy devices use a variety of material removal instruments, such as rotating cutters or ablative burrs, for example, to remove the occluding material.
- material removal instruments such as rotating cutters or ablative burrs, for example, to remove the occluding material.
- atherectomy device refers to a device for removing an occlusion in any portion of a patient's vasculature.
- the atherectomy devices provided in accordance with preferred embodiments of the present invention are well suited for use in the coronary arteries, their use is not limited to the coronary arteries.
- the material removal instrument is typically rotated via a flexible driveshaft that is connected to an electric motor or a turbine.
- a guide wire is first routed from a point on the patient's exterior to the site of the occlusion.
- the material removal instrument is then advanced over the guide wire until it is positioned just proximal to the occlusion.
- the motor or turbine then rotates the driveshaft and the material removal instrument. As the material removal instrument is rotating, it is advanced through the occluded vessel.
- the material removal instrument removes the occluding material from the vessel, rather than merely displacing or reforming the material as is done in a balloon angioplasty procedure.
- Rotablator® system sold by Boston Scientific Corporation.
- This system includes an advancer housing that encloses an air-driven turbine drive assembly.
- a material removal instrument comprising an ablation burr coupled to a flexible driveshaft, is rotatably connected to the drive assembly.
- a burr of a particular shape and/or size is selected, and the driveshaft length is specified.
- the driveshaft is coupled to the drive assembly in the advancer housing, such that torque from the drive assembly is transmitted through the driveshaft to the burr.
- the burr is advanced and retracted through the occlusion via longitudinal motion of the drive assembly.
- the driveshaft is coupled to the drive assembly, by a thin connector tube that is attached to a proximal end of the driveshaft.
- the connector tube must be axially aligned with and connected to a second thin connector tube extending distally from the drive assembly.
- the connector tubes are interlocked and held in place with a tubular sheath that slides over the interlocked joint.
- Such a connection is sometimes referred to as a “handshake” connection.
- the driveshaft and drive assembly tubes are narrow, having a diameter of approximately 1 millimeter. It may be difficult therefore to align and interlock the connector tubes even under optimal conditions.
- the cardiologist or other operator of the device wears surgical attire and a stiff shield to protect against x-rays, making it more difficult for the operator to perform the precise movements needed to couple a conventional handshake connection.
- a drive assembly is positioned within a housing, and is slidably movable along a longitudinal axis of the housing.
- a hollow shaft is coupled to a prime mover in the drive assembly, such as an electric motor or turbine, and extends towards a distal end of the housing.
- An elastomeric plug is positioned in the drive assembly, and a longitudinal aperture extends through the elastomeric plug in axial alignment with the shaft.
- An ablation instrument such as a rotatable burr, is coupled to a distal end of a flexible driveshaft.
- a connector tube is coupled to a proximal end of the driveshaft, the tube being adapted to connect the driveshaft to the drive assembly.
- a catheter-body connector slidably engages the driveshaft adjacent the proximal end, such that the driveshaft extends longitudinally through the catheter.
- the connector tube is inserted into the drive assembly shaft until a proximal end of the connector tube is pushed into the aperture of the elastomeric plug.
- An interference fit is created between the connector tube and the elastomeric plug, thereby coupling the driveshaft to the drive assembly.
- the elastomeric plug may be positioned in various locations in the drive assembly, in a preferred embodiment, it is provided in an aperture extending axially from the prime mover.
- a proximal end of the tube is tapered or formed as a smooth ball on the end of the tube.
- a stop is provided on the connector tube that abuts a distal end of the shaft when the connector tube is engaged by the elastomeric plug.
- the driveshaft is easily coupled to the drive assembly by simply pushing the proximal end of the connector tube into the shaft extending through the housing.
- the connector tube coupled to the proximal end of the driveshaft extends through the length of the shaft and into the elastomeric plug. If it is desired to remove the ablation instrument from the advancer housing, the catheter-body connector is disconnected and the tube is pulled away from the housing, thereby disengaging the driveshaft tube from the elastomeric plug.
- FIG. 1 is a side elevational view of a prior art ablation assembly
- FIG. 2 is a partially cut away, side view of an ablation assembly in accordance with an embodiment of the present invention
- FIG. 3 is a cross-sectional view of shwing the drive assembly and related components of the ablation assembly illustrated in FIG. 2;
- FIGS. 4 A- 4 E are perspective views of alternative embodiments of the elastomeric plug for the ablation assembly shown in FIG. 2, showing alternative longitudinal aperture configurations.
- FIG. 1 A prior art ablation assembly 100 is illustrated in FIG. 1.
- An ablation instrument 101 such as a rotatable burr, is coupled to a distal end of a flexible driveshaft 102 .
- a catheter-body connector 103 is positioned near the proximal end of the driveshaft 102 , to increase the operator's ease of grasping and manipulating the driveshaft 102 .
- a drive assembly 107 is positioned within an advancer housing 106 .
- the drive assembly contains a turbine (not shown), and is movable along a longitudinal path of motion.
- a tube 104 is coupled to a proximal end of the driveshaft 102 .
- a second tube 108 extends distally from an end region of the advancer housing 106 .
- a proximal end 105 of tube 104 has a cutaway section that mates with a correspondingly shaped cutaway section at the distal end 109 of second tube 108 .
- the tubes 104 and 108 are very fine, having a diameter on the order of 1 millimeter.
- a sheath 110 is slid over the joined ends of the interlocked tubes 104 and 108 .
- the second tube 108 is attached to a second driveshaft (not shown) that extends into the drive assembly 107 , such that torque is transmitted from the drive assembly 107 to the driveshaft 102 through the connection of tubes 104 and 108 . Also, longitudinal movement of the ablation instrument 101 is achieved by moving the drive assembly 107 forward along its longitudinal path of motion in the housing 106 .
- FIGS. 2 3 An ablation assembly 10 provided in accordance with one embodiment of the present invention is illustrated in FIGS. 2 3 .
- an ablation instrument 11 such as a rotatable burr, is coupled to a distal end 13 of rotatable driveshaft 12 .
- a tube 15 is coupled to a proximal end 14 of driveshaft 12 .
- a catheter-body connector 31 surrounds the driveshaft 12 , adjacent the proximal end 14 of the driveshaft 12 .
- the tube has a tapered proximal end 21 .
- a rotational advancer mechanism comprising a drive assembly 16 is positioned within an advancer housing 29 .
- the drive assembly 16 is movable from a first retracted position 17 , forward along a longitudinal path of motion 18 .
- a knob 36 is coupled to the drive assembly 16 through a threaded shaft 40 that extends through a slot 41 in the housing 29 .
- the drive assembly 16 is released for lateral movement by unscrewing the knob 36 . Moving the knob 36 forward and backward along the slot 41 will then cause the drive assembly 16 to slide forward and backward.
- a pumpshaft 23 extends longitudinally through the drive assembly 16 , as seen in FIG. 3.
- a shaft tubular 30 is axially aligned with the pumpshaft 23 and is fixed to a distal end of the drive assembly 16 .
- the tubular shaft 30 extends towards a distal end of the housing 29 .
- the drive assembly 16 includes a compressed-air driven turbine 22 positioned in a turbine housing 32 .
- the driveshaft 12 In order to operate the ablation assembly, it is necessary to couple the driveshaft 12 to the drive assembly 16 , such that torque from the turbine 22 is transmitted to the driveshaft 12 causing it to rotate, and longitudinal movement of the drive assembly 16 will selectively advance and retract the ablation instrument 11 .
- An elastomeric plug 19 is provided in the drive assembly 16 .
- the elastomeric plug 19 is made from rubber or a thermoplastic elastomer such as that sold under the brand name KraytonTM.
- the elastomeric plug 19 may be coupled to the drive assembly 16 in various positions, in a preferred embodiment, it is positioned adjacent turbine 22 in an aperture 34 defined by flanges 37 extending from the turbine 22 such that the plug 19 is secured within and rotates with the turbine 22 .
- a cylindrical aperture 20 extends longitudinally through the elastomeric plug 19 .
- Tube 15 is secured to the proximal end of the driveshaft 12 , and the proximal end 21 of tube 15 is inserted through the tubular shaft 30 .
- the tube 15 is inserted completely through the tubular shaft 30 and the pumpshaft 23 until the proximal end 21 engages the aperture 20 of elastomeric plug 19 .
- the aperture 20 is sized to create an interference fit between the tube 15 and the elastomeric plug 19 .
- the interference fit between the tube 15 and elastomeric plug 19 couples the driveshaft 12 to the drive assembly 16 , such that the ablation instrument 11 is advanced with forward motion of the drive assembly 16 , and further, the ablation instrument 11 is rotatably coupled with the turbine 22 .
- FIG. 3 has an elastomeric plug 19 with cylindrical aperture 20
- FIGS. 4 A- 4 E show four possible plug configurations. These aperture shapes are intended as a representative selection of contemplated aperture shapes and not as an exhaustive or limiting disclosure.
- FIG. 4A shows the circular aperture 20 also shown in FIG. 3.
- FIG. 4B discloses a single slot 47 in a plug 19 b
- FIG. 4C shows an alternative aperture comprising two crossed slots 48 that extend through a plug 19 c
- FIG. 4D shows yet another alternative comprising three slots 49 that cross at a single line, and extend through a plug 19 d
- FIG. 4E shows an elastomeric plug 19 e with no pre-cut central aperture, wherein an aperture would be created when the ablation assembly 10 is assembled, by the insertion of the tube 15 through the plug 19 e.
- the pumpshaft 23 has an inner diameter 26 of sufficient width to accommodate the tube 15 .
- the proximal end 21 is tapered.
- the proximal end 21 of tube 15 may have a rounded profile.
- the catheter-body connector 31 (FIG. 2) surrounds the driveshaft 12 adjacent its proximal end 14 , such that the driveshaft 12 extends longitudinally through the center of the catheter-body connector 31 .
- a stop 27 is coupled to the tube 15 at an axial location such that the stop 27 abuts the distal end 25 of the pumpshaft 23 when the proximal end 21 of tube 15 is properly engaged by the elastomeric plug 19 .
- the elastomeric plug 19 and associated aperture 20 preferably have a length of about 0.5 inches.
- the driveshaft 12 is easily coupled to the drive assembly 16 by inserting the tapered proximal end 21 of the tube 15 into the shaft 30 and through the pumpshaft 23 until the proximal end 21 is secured in the elastomeric plug 19 . If it is desired to remove or replace the ablation instrument 11 , the operator simply disconnects the catheter-body connector 31 and pulls the tube 15 away from the housing 29 , thereby disengaging the tube 15 from the elastomeric plug 19 .
- the strength of the friction connection between the tube 15 and elastomeric plug 19 be less than the strength of the connection between the ablation instrument 11 and driveshaft 12 .
- the connection between the tube 15 and elastomeric plug 19 should fail before the connection between the ablation instrument 11 and driveshaft 12 fails. More particularly, the turbine 22 will continue to spin, but the tube 15 will slip within the elastomeric plug 19 . The driveshaft 12 will therefore simply cease to spin, rather than shearing off the ablation instrument 11 .
Abstract
Description
- This invention relates to a method and apparatus for ablating unwanted material from a patient's vasculature, and more particularly, to rotational ablation atherectomy devices.
- Vascular diseases, such as atherosclerosis and the like, have become quite prevalent in the modern day. These diseases may manifest themselves in a number of ways, often requiring different forms or methods of treatment for curing or mitigating the adverse effects of the diseases. For example, vascular diseases may take the form of deposits or growths in a patient's vasculature which restrict, in the case of a partial occlusion, or, stop, in the case of a total occlusion, blood flow to a certain portion of the patient's body. This can be particularly serious if, for example, such an occlusion occurs in a portion of the vasculature that supplies vital organs with blood or other necessary fluids.
- To treat these diseases, a number of different therapies have been developed. For example, medical instruments have been developed that remove the material occluding a vascular lumen. Such instruments, sometimes referred to as atherectomy devices, use a variety of material removal instruments, such as rotating cutters or ablative burrs, for example, to remove the occluding material. (The term “atherectomy device” as used in the specification refers to a device for removing an occlusion in any portion of a patient's vasculature. Thus, while the atherectomy devices provided in accordance with preferred embodiments of the present invention are well suited for use in the coronary arteries, their use is not limited to the coronary arteries.) In rotational atherectomy devices, the material removal instrument is typically rotated via a flexible driveshaft that is connected to an electric motor or a turbine.
- In operation, a guide wire is first routed from a point on the patient's exterior to the site of the occlusion. The material removal instrument is then advanced over the guide wire until it is positioned just proximal to the occlusion. The motor or turbine then rotates the driveshaft and the material removal instrument. As the material removal instrument is rotating, it is advanced through the occluded vessel. The material removal instrument removes the occluding material from the vessel, rather than merely displacing or reforming the material as is done in a balloon angioplasty procedure.
- One example of a rotational ablation atherectomy device is the Rotablator® system, sold by Boston Scientific Corporation. This system includes an advancer housing that encloses an air-driven turbine drive assembly. A material removal instrument comprising an ablation burr coupled to a flexible driveshaft, is rotatably connected to the drive assembly. Depending on the location of the occlusion within a patient's vasculature and other considerations, a burr of a particular shape and/or size is selected, and the driveshaft length is specified. The driveshaft is coupled to the drive assembly in the advancer housing, such that torque from the drive assembly is transmitted through the driveshaft to the burr. The burr is advanced and retracted through the occlusion via longitudinal motion of the drive assembly.
- In current embodiments of the Rotablator® system, the driveshaft is coupled to the drive assembly, by a thin connector tube that is attached to a proximal end of the driveshaft. The connector tube must be axially aligned with and connected to a second thin connector tube extending distally from the drive assembly. The connector tubes are interlocked and held in place with a tubular sheath that slides over the interlocked joint. Such a connection is sometimes referred to as a “handshake” connection. The driveshaft and drive assembly tubes are narrow, having a diameter of approximately 1 millimeter. It may be difficult therefore to align and interlock the connector tubes even under optimal conditions. When performing an atherectomy procedure, however, the cardiologist or other operator of the device wears surgical attire and a stiff shield to protect against x-rays, making it more difficult for the operator to perform the precise movements needed to couple a conventional handshake connection.
- Given the considerations discussed above, it is desirable to provide a rotational ablation atherectomy device in which it is easier to couple the drive assembly to the driveshaft. The present invention fulfills this need, and provides further related advantages.
- Briefly, the present invention provides an improved ablation assembly that is easier to use. In a preferred embodiment, a drive assembly is positioned within a housing, and is slidably movable along a longitudinal axis of the housing. A hollow shaft is coupled to a prime mover in the drive assembly, such as an electric motor or turbine, and extends towards a distal end of the housing. An elastomeric plug is positioned in the drive assembly, and a longitudinal aperture extends through the elastomeric plug in axial alignment with the shaft. An ablation instrument, such as a rotatable burr, is coupled to a distal end of a flexible driveshaft. A connector tube is coupled to a proximal end of the driveshaft, the tube being adapted to connect the driveshaft to the drive assembly.
- In order to assist the operator in grasping and manipulating the driveshaft and associated connector tube, a catheter-body connector slidably engages the driveshaft adjacent the proximal end, such that the driveshaft extends longitudinally through the catheter. The connector tube is inserted into the drive assembly shaft until a proximal end of the connector tube is pushed into the aperture of the elastomeric plug. An interference fit is created between the connector tube and the elastomeric plug, thereby coupling the driveshaft to the drive assembly.
- Although the elastomeric plug may be positioned in various locations in the drive assembly, in a preferred embodiment, it is provided in an aperture extending axially from the prime mover. In order to facilitate insertion of the connector tube into the shaft, a proximal end of the tube is tapered or formed as a smooth ball on the end of the tube. Also, in a preferred embodiment, a stop is provided on the connector tube that abuts a distal end of the shaft when the connector tube is engaged by the elastomeric plug.
- In this manner, the driveshaft is easily coupled to the drive assembly by simply pushing the proximal end of the connector tube into the shaft extending through the housing. The connector tube coupled to the proximal end of the driveshaft extends through the length of the shaft and into the elastomeric plug. If it is desired to remove the ablation instrument from the advancer housing, the catheter-body connector is disconnected and the tube is pulled away from the housing, thereby disengaging the driveshaft tube from the elastomeric plug.
- The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
- FIG. 1 is a side elevational view of a prior art ablation assembly;
- FIG. 2 is a partially cut away, side view of an ablation assembly in accordance with an embodiment of the present invention;
- FIG. 3 is a cross-sectional view of shwing the drive assembly and related components of the ablation assembly illustrated in FIG. 2; and
- FIGS.4A-4E are perspective views of alternative embodiments of the elastomeric plug for the ablation assembly shown in FIG. 2, showing alternative longitudinal aperture configurations.
- A prior
art ablation assembly 100 is illustrated in FIG. 1. Anablation instrument 101, such as a rotatable burr, is coupled to a distal end of aflexible driveshaft 102. A catheter-body connector 103 is positioned near the proximal end of thedriveshaft 102, to increase the operator's ease of grasping and manipulating thedriveshaft 102. Adrive assembly 107 is positioned within anadvancer housing 106. The drive assembly contains a turbine (not shown), and is movable along a longitudinal path of motion. - In order to operate the
ablation assembly 100, it is necessary to couple thedriveshaft 102 to thedrive assembly 107. In a currently available system, sold by Boston Scientific Corporation and illustrated in FIG. 1, atube 104 is coupled to a proximal end of thedriveshaft 102. Similarly, asecond tube 108 extends distally from an end region of theadvancer housing 106. In order to couple thedriveshaft 102 to thedrive assembly 107, aproximal end 105 oftube 104 has a cutaway section that mates with a correspondingly shaped cutaway section at thedistal end 109 ofsecond tube 108. Thetubes tubes tube 104 to thesecond tube 108, asheath 110 is slid over the joined ends of the interlockedtubes - The
second tube 108 is attached to a second driveshaft (not shown) that extends into thedrive assembly 107, such that torque is transmitted from thedrive assembly 107 to thedriveshaft 102 through the connection oftubes ablation instrument 101 is achieved by moving thedrive assembly 107 forward along its longitudinal path of motion in thehousing 106. - An
ablation assembly 10 provided in accordance with one embodiment of the present invention is illustrated in FIGS. 2 3. In the disclosed embodiment, anablation instrument 11, such as a rotatable burr, is coupled to adistal end 13 ofrotatable driveshaft 12. Atube 15 is coupled to aproximal end 14 ofdriveshaft 12. To further increase the ease with which thetube 15 anddriveshaft 12 may be grasped and manipulated, a catheter-body connector 31 surrounds thedriveshaft 12, adjacent theproximal end 14 of thedriveshaft 12. In the preferred embodiment, the tube has a taperedproximal end 21. - A rotational advancer mechanism comprising a
drive assembly 16 is positioned within anadvancer housing 29. Thedrive assembly 16 is movable from a first retractedposition 17, forward along a longitudinal path ofmotion 18. Although this may be done in a variety of ways, in a preferred embodiment, aknob 36 is coupled to thedrive assembly 16 through a threadedshaft 40 that extends through aslot 41 in thehousing 29. Thedrive assembly 16 is released for lateral movement by unscrewing theknob 36. Moving theknob 36 forward and backward along theslot 41 will then cause thedrive assembly 16 to slide forward and backward. Apumpshaft 23 extends longitudinally through thedrive assembly 16, as seen in FIG. 3. Ashaft tubular 30 is axially aligned with thepumpshaft 23 and is fixed to a distal end of thedrive assembly 16. Thetubular shaft 30 extends towards a distal end of thehousing 29. - As best seen in FIG. 3, the
drive assembly 16 includes a compressed-air driventurbine 22 positioned in aturbine housing 32. In order to operate the ablation assembly, it is necessary to couple thedriveshaft 12 to thedrive assembly 16, such that torque from theturbine 22 is transmitted to thedriveshaft 12 causing it to rotate, and longitudinal movement of thedrive assembly 16 will selectively advance and retract theablation instrument 11. - An
elastomeric plug 19 is provided in thedrive assembly 16. Although a variety of materials may be used, in a preferred embodiment, theelastomeric plug 19 is made from rubber or a thermoplastic elastomer such as that sold under the brand name Krayton™. Although theelastomeric plug 19 may be coupled to thedrive assembly 16 in various positions, in a preferred embodiment, it is positionedadjacent turbine 22 in anaperture 34 defined byflanges 37 extending from theturbine 22 such that theplug 19 is secured within and rotates with theturbine 22. - In the embodiment shown in FIG. 3, a
cylindrical aperture 20 extends longitudinally through theelastomeric plug 19.Tube 15 is secured to the proximal end of thedriveshaft 12, and theproximal end 21 oftube 15 is inserted through thetubular shaft 30. To couple thedriveshaft 12 to theturbine 22, thetube 15 is inserted completely through thetubular shaft 30 and thepumpshaft 23 until theproximal end 21 engages theaperture 20 ofelastomeric plug 19. Theaperture 20 is sized to create an interference fit between thetube 15 and theelastomeric plug 19. The interference fit between thetube 15 andelastomeric plug 19 couples thedriveshaft 12 to thedrive assembly 16, such that theablation instrument 11 is advanced with forward motion of thedrive assembly 16, and further, theablation instrument 11 is rotatably coupled with theturbine 22. - Although the ablation assembly embodiment shown in FIG. 3 has an
elastomeric plug 19 withcylindrical aperture 20, other aperture shapes are also contemplated by the present invention. For example, FIGS. 4A-4E show four possible plug configurations. These aperture shapes are intended as a representative selection of contemplated aperture shapes and not as an exhaustive or limiting disclosure. FIG. 4A shows thecircular aperture 20 also shown in FIG. 3. FIG. 4B discloses asingle slot 47 in aplug 19 b, FIG. 4C shows an alternative aperture comprising two crossedslots 48 that extend through aplug 19 c, and FIG. 4D shows yet another alternative comprising threeslots 49 that cross at a single line, and extend through aplug 19 d. FIG. 4E shows anelastomeric plug 19 e with no pre-cut central aperture, wherein an aperture would be created when theablation assembly 10 is assembled, by the insertion of thetube 15 through theplug 19 e. - Referring again to FIG. 3, the
pumpshaft 23 has aninner diameter 26 of sufficient width to accommodate thetube 15. In order to facilitate the insertion of thetube 15 into thepumpshaft 23, theproximal end 21 is tapered. Alternatively, theproximal end 21 oftube 15 may have a rounded profile. The catheter-body connector 31 (FIG. 2) surrounds thedriveshaft 12 adjacent itsproximal end 14, such that thedriveshaft 12 extends longitudinally through the center of the catheter-body connector 31. To further ensure correct placement of thetube 15, astop 27 is coupled to thetube 15 at an axial location such that thestop 27 abuts thedistal end 25 of thepumpshaft 23 when theproximal end 21 oftube 15 is properly engaged by theelastomeric plug 19. To ensure a secure coupling, theelastomeric plug 19 and associatedaperture 20 preferably have a length of about 0.5 inches. - Therefore, the
driveshaft 12 is easily coupled to thedrive assembly 16 by inserting the taperedproximal end 21 of thetube 15 into theshaft 30 and through thepumpshaft 23 until theproximal end 21 is secured in theelastomeric plug 19. If it is desired to remove or replace theablation instrument 11, the operator simply disconnects the catheter-body connector 31 and pulls thetube 15 away from thehousing 29, thereby disengaging thetube 15 from theelastomeric plug 19. - For safety considerations, it is desirable that the strength of the friction connection between the
tube 15 andelastomeric plug 19 be less than the strength of the connection between theablation instrument 11 anddriveshaft 12. Thus, if theablation instrument 11 becomes lodged and unable to rotate, the connection between thetube 15 andelastomeric plug 19 should fail before the connection between theablation instrument 11 anddriveshaft 12 fails. More particularly, theturbine 22 will continue to spin, but thetube 15 will slip within theelastomeric plug 19. Thedriveshaft 12 will therefore simply cease to spin, rather than shearing off theablation instrument 11. - From the foregoing, it will be appreciated that although embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without deviating from the spirit of the invention. For example, although the invention has been described for use with a rotational ablation instrument, it will be apparent that the invention is equally applicable for use with other material removal instruments, such as rotating cutters. Thus, the present invention is not limited to the embodiments described herein, but rather is defined by the claims which follow and equivalents thereof.
Claims (10)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US09/846,055 US6475225B1 (en) | 2001-04-30 | 2001-04-30 | Ablation assembly with elastomeric driveshaft connection |
PCT/US2002/013397 WO2002087450A1 (en) | 2001-04-30 | 2002-04-26 | Ablation assembly with elastomeric driveshaft connection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/846,055 US6475225B1 (en) | 2001-04-30 | 2001-04-30 | Ablation assembly with elastomeric driveshaft connection |
Publications (2)
Publication Number | Publication Date |
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US20020161384A1 true US20020161384A1 (en) | 2002-10-31 |
US6475225B1 US6475225B1 (en) | 2002-11-05 |
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Application Number | Title | Priority Date | Filing Date |
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US09/846,055 Expired - Lifetime US6475225B1 (en) | 2001-04-30 | 2001-04-30 | Ablation assembly with elastomeric driveshaft connection |
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US (1) | US6475225B1 (en) |
WO (1) | WO2002087450A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220125475A1 (en) * | 2020-10-27 | 2022-04-28 | Boston Scientific Scimed, Inc. | Magnetically driven atherectomy system |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101380244B (en) * | 2008-10-06 | 2010-12-08 | 丁起武 | Intra-cavity milling type stone breaking device in urinary system |
US20110087254A1 (en) * | 2009-10-09 | 2011-04-14 | Cardiovascular Systems, Inc. | Rotational atherectomy device with keyed exchangeable drive shaft |
US11690645B2 (en) | 2017-05-03 | 2023-07-04 | Medtronic Vascular, Inc. | Tissue-removing catheter |
CN114948106A (en) | 2017-05-03 | 2022-08-30 | 美敦力瓦斯科尔勒公司 | Tissue removal catheter with guidewire isolation bushing |
EP3880096A1 (en) | 2018-11-16 | 2021-09-22 | Medtronic Vascular Inc. | Tissue-removing catheter |
US11819236B2 (en) | 2019-05-17 | 2023-11-21 | Medtronic Vascular, Inc. | Tissue-removing catheter |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5766190A (en) * | 1995-05-24 | 1998-06-16 | Boston Scientific Corporation Northwest Technology Center, Inc. | Connectable driveshaft system |
US6077282A (en) * | 1997-10-27 | 2000-06-20 | Shturman Cardiology Systems, Inc. | Rotational atherectomy device with exchangeable drive shaft cartridge |
CA2256130A1 (en) * | 1998-12-16 | 2000-06-16 | Scott L. Pool | Rotatable dynamic seal and guide for a medical obstruction treatment device sub-assembly attached to a drive motor unit |
-
2001
- 2001-04-30 US US09/846,055 patent/US6475225B1/en not_active Expired - Lifetime
-
2002
- 2002-04-26 WO PCT/US2002/013397 patent/WO2002087450A1/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220125475A1 (en) * | 2020-10-27 | 2022-04-28 | Boston Scientific Scimed, Inc. | Magnetically driven atherectomy system |
WO2022093796A1 (en) * | 2020-10-27 | 2022-05-05 | Boston Scientific Scimed, Inc. | Magnetically driven atherectomy system |
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Publication number | Publication date |
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US6475225B1 (en) | 2002-11-05 |
WO2002087450A1 (en) | 2002-11-07 |
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