US20070270879A1 - Sacroiliac joint fusion alignment guide - Google Patents
Sacroiliac joint fusion alignment guide Download PDFInfo
- Publication number
- US20070270879A1 US20070270879A1 US11/406,888 US40688806A US2007270879A1 US 20070270879 A1 US20070270879 A1 US 20070270879A1 US 40688806 A US40688806 A US 40688806A US 2007270879 A1 US2007270879 A1 US 2007270879A1
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- United States
- Prior art keywords
- sacroiliac joint
- alignment guide
- trajectory
- distal end
- guidance arm
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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.)
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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
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/17—Guides or aligning means for drills, mills, pins or wires
- A61B17/1739—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/17—Guides or aligning means for drills, mills, pins or wires
- A61B17/1739—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
- A61B17/1742—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the hip
Definitions
- the present invention relates to a device and method for applying screws to fuse a sacroiliac joint in a patient.
- the sacroiliac (SI) joint 10 is located between the sacrum 11 and the hip bones 12 , known as the ilium, in the human body, as shown in FIG. 1 , and functions to transmit forces from the spine 14 , including vertebrae 14 a, intervertebral discs 14 b and the coccyx 14 c, to the lower extremities.
- the sacroiliac joint 10 is supported by ligaments and muscle.
- the sacroiliac joint 10 can degenerate over time, requiring a fusion procedure to stabilize the degenerated segment. For example, one condition, degenerative sacroiliitis, results in a narrow joint space with bone spur formation.
- Iatrogenic (i.e., induced by treatment) procedures can also cause degeneration, requiring sacroiliac joint fusion.
- infection, ligamentous disruption due to pregnancy, and/or trauma causing fracture dislocation may require a sacroiliac joint fusion procedure to provide sufficient stabilization to allow the patient to achieve a normal lifestyle.
- a standard sacroiliac stabilization procedure consists of the following steps: a posterior exposure to the spine, the removal of degenerated sacroiliac joint material, the posterior placement of a stabilizing screw/joint construct, or the lateral placement of screws directly through the sacroiliac joint, and, finally, the substitution of bone graft into the joint, which subsequently fuses to stabilize the sacroiliac joint region.
- a surgeon makes a secondary incision and drives screws through the external table of the iliac crest through the sacroiliac joint and into the sacrum.
- the trajectory of these screws is critical. If a surgeon places screws on a path too anterior, the screws may penetrate the sacral wall and damage the vessels that lie just beyond. If a surgeon places screws on a path too posterior, the screws may penetrate the sacral wall or sacral foramina and damage the nerves of the cauda aquina. Achieving and maintaining a precise trajectory can be difficult in the limited operating space. Therefore, a device to precisely guide the trajectory of the screws is optimal in a sacroiliac joint stabilization procedure.
- the present invention provides a sacroiliac joint fusion alignment guide to allow accurate screw placement through the sacroiliac joint during a sacroiliac joint stabilization procedure.
- the sacroiliac joint fusion alignment guide is adjustable to allow use with varying patient anatomies.
- the sacroiliac joint fusion alignment guide includes a handle and two adjustable guidance arms for defining a trajectory for guiding screws and other instruments used in the sacroiliac joint stabilization procedure.
- the first guidance arm has a substantially straight pronged distal end terminating in a first prong, a second prong and a space between the first prong and second prong defining a first point in a straight trajectory for inserting screws into a sacroiliac joint.
- the guidance arm forms a receiving bore on a distal end thereof to define a second point in the trajectory.
- the pronged distal end is inserted through a posterior incision in the patient into a cored-out sacroiliac joint, with the second guidance arm outside the body, and the orientation of the alignment guide is adjusted by pivoting the alignment guide about the pronged distal end to determine a suitable trajectory. Instruments are placed along the trajectory and guided by the alignment guide to drill screw holes and insert screws used in the sacroiliac joint fusion procedure into the screw holes.
- a sacroiliac joint fusion alignment guide comprises a handle, a first guidance arm connected to the handle having a substantially straight pronged distal end terminating in a first prong, a second prong and a space between the first prong and second prong defining a first point in a straight trajectory for inserting screws into a sacroiliac joint and a second guidance arm coupled to the first guidance arm forming a receiving bore on a distal end thereof to define a second point in the trajectory.
- a method of guiding screws into a sacroiliac joint of a patient comprises the steps of inserting a pronged distal end of an alignment guide through a posterior incision in the patient into a cored-out sacroiliac joint and adjusting the orientation of the alignment guide to determine a suitable trajectory, defined by the alignment guide, for the screws, the trajectory extending from the sacroiliac joint through an iliac crest and out of the patient.
- a method of guiding screws into a sacroiliac joint of a patient comprises the steps of providing an alignment guide comprising a handle, a first guidance arm having a distal end defining a first portion of a trajectory for inserting screws used to fuse the sacroiliac joint, and a second guidance arm having a distal end defining a second portion of the trajectory and using the alignment guide to insert screws along the trajectory and into the sacroiliac joint.
- FIG. 1 illustrates the region of the human body containing the sacroiliac joint targeted using a sacroiliac joint fusion alignment guide of an illustrative embodiment of the invention.
- FIG. 2 illustrates an embodiment of a sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention.
- FIG. 3 is an exploded view of the sacroiliac joint fusion alignment guide of FIG. 2 .
- FIG. 4A is a front view of the sacroiliac joint fusion alignment guide of FIG. 2 .
- FIG. 4B is a side view of the sacroiliac joint fusion alignment guide of FIG. 2 .
- FIGS. 5A and 5B illustrates the handle of the sacroiliac joint fusion alignment guide of FIG. 2 according to one embodiment of the invention.
- FIGS. 6A-6E illustrate the first guidance arm of the sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention.
- FIGS. 7A-7E illustrate the second guidance arm of the sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention.
- FIG. 8 is a flow chart illustrating a sacroiliac fusion procedure using a sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention.
- FIGS. 9A-9K illustrates the sacroiliac joint fusion alignment guide and related instruments during the steps shown in FIG. 8 .
- FIG. 10 illustrates a sacroiliac joint fusion alignment guide according to another embodiment of the invention.
- the present invention provides an improved surgical device and method for performing a sacroiliac joint fusion procedure.
- the present invention will be described below relative to certain exemplary embodiments in spinal surgery to provide an overall understanding of the principles of the structure, function, manufacture, and use of the instruments disclosed herein.
- Those skilled in the art will appreciate that the present invention may be implemented in a number of different applications and embodiments and is not specifically limited in its application to the particular embodiments depicted herein.
- the illustrative embodiment of the invention relates to a sacroiliac joint fusion alignment guide used in sacroiliac joint fusion surgery
- the sacroiliac joint fusion alignment guide may be used in any surgical process where a trajectory is used to guide instruments to a surgical site.
- FIGS. 2-4B illustrate an embodiment of a sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention.
- the illustrative sacroiliac joint fusion alignment guide 100 comprises a handle 120 , a first guidance arm 130 for providing guidance to surgical devices at a distal end thereof, and a second guidance arm 140 for providing guidance to surgical instruments at a distal end thereof.
- the two guidance arms cooperate to define a straight trajectory 160 for guiding instruments and implements used in a sacroiliac joint fusion procedure or other surgical procedure.
- the first guidance arm 130 and the second guidance arm 140 slidably engage to allow device adjustment of the length L between the guidance arms 130 and 140 to accommodate different patient anatomies.
- the handle 120 may be removable coupled to the first guidance arm 130 and/or the second guidance arm 140 .
- the handle 120 includes a gripping end 122 that a surgeon may hold and a coupling end 124 .
- the coupling end 124 may include threads 125 or other suitable coupling means for coupling the handle 120 to one or both of the guidance arms 130 and/or 140 .
- the coupling mechanism is not limited to the illustrative threads and may comprise any suitable coupling means.
- the first guidance arm 130 includes a pronged distal end 132 for defining the trajectory 160 and a male engagement proximal end 134 .
- the pronged distal end 132 includes a first prong 1321 and a second prong 1322 .
- the space 1324 in the notch between the first prong 1321 and second prong 1322 defines a portion of the trajectory 160 for receiving and guiding instruments during a surgical procedure, such as a sacroiliac joint fusion procedure.
- the prongs 1321 and 1322 are preferably sized and dimensioned to receive a guidewire used in a sacroiliac joint fusion procedure in the space 1324 formed therebetween.
- pronged distal end 132 is tapered to facilitate insertion of the first guidance arm 130 into the sacroiliac joint 10 .
- the distal end 132 includes surfaces 1325 and 1326 that taper to a point at the distal end.
- the pronged distal end 132 is preferably bent in a direction away from the male engagement proximal end 134 .
- the pronged distal end 132 extends substantially perpendicular to the male engagement proximal end 134 , but one skilled in the art will recognize that the pronged distal end 132 and male engagement proximal end 134 may have any suitable orientation relative to each other.
- the distal end 132 is substantially straight from the curved portion defining the transition between the distal end 132 and the male engagement proximal end 134 to facilitate insertion of the distal end 132 into relatively small incision.
- the male engagement proximal end 134 of the first guidance arm includes a coupling means, illustrated as a threaded hole 341 on a top surface thereof for coupling to the handle 120 .
- the coupling means may comprise any suitable means for receiving and/or coupling to the handle 120 .
- the male engagement proximal end 134 is also configured to movably couple to the second guidance arm 140 .
- the male engagement proximal end 134 includes an upper portion 1342 and a lower portion 1341 that is wider than the upper portion to define flanges 1341 a, 1341 b protruding from the sides along the length of the male engagement proximal end 134 , as shown in FIG. 6C .
- the tip 1345 of the illustrative male engagement proximal end 134 of the first guidance arm 130 is rounded, but one skilled in the art will recognize that the tip 1345 can have any suitable configuration.
- the second guidance arm 140 of the sacroiliac joint fusion alignment guide 100 includes an attachment distal end 142 defining the trajectory 160 and a female engagement proximal end 144 for receiving the male engagement proximal end 134 of the first guidance arm 130 .
- the attachment distal end 142 of the second guidance arm 140 includes a receiving bore 1421 configured to accept a shaft having an arbitrary cross-section defining a portion of the trajectory 160 .
- the longitudinal axis of the receiving bore 1421 aligns with the trajectory 160 .
- An obturator and/or another surgical instrument can pass through the receiving bore 1421 on the distal end of the second guidance arm 140 , as described in detail below.
- the receiving bore 1421 may have any suitable size and shape suitable for defining the trajectory and for guiding instruments during a surgical procedure.
- the receiving bore 1421 preferably has an open bottom end 1422 to allow movement of the guidance device 100 away from an instrument received in the receiving bore 1421 .
- the attachment distal end 142 is bent away from the axis of the female engagement proximal end 144 .
- the attachment distal end 142 extends substantially perpendicular to the female engagement proximal end 144 , but one skilled in the art will recognize that the attachment distal end 142 and female engagement proximal end 144 may have any suitable orientation relative to each other.
- the first guidance arm 130 engages with the second guidance arm 140 via the male and female engagement proximal ends 134 , 144 , respectively.
- the female engagement proximal end 144 includes a slot 1441 sized and configured to receive the male engagement proximal end 134 .
- the illustrative slot 1441 has an open top side 1442 , a top portion 1443 and a bottom portion 1444 that is wider than the top portion, as shown in FIG. 7C , to receive the flanged bottom of the corresponding male engagement proximal end 134 .
- the flanges 1341 a, 1341 b on the lower portion 1341 of the male engagement proximal end engage the side walls in the bottom portion 1444 of the receiving slot 1441 to guide the male engagement proximal end in the slot.
- the receiving bore 1421 aligns with the space 1324 of the prong distal end 132 to define two sections of the trajectory 160 .
- the handle 120 attaches to the first guidance arm 130 and may provide a means to manipulate the first guidance arm 130 within the second guidance arm 140 , and also to lock the position of the first guidance arm relative to the second guidance arm. In one embodiment, the handle 120 rotates about its axis to loosen and/or tighten the connection between the guidance arms and/or between the handle 120 and the guidance arms.
- a ratcheting means or other device may be used to control the distance L between the two guidance arms.
- an infinite number of relative positions may be provided by sliding the guidance arms relative to each other.
- Guiding posts 1432 are provided to allow ease of translation between guidance arms 130 and 140 .
- the guide may be gripped to facilitate translation of the first guidance arm 130 relative to the second guidance arm 140 .
- Other guide mechanisms may be provided in place of the guide posts.
- the second guidance arm (or the first guidance arm) may contain a stop to prevent the guidance arms from separating when the handle is in place.
- the illustrative second guidance arm 140 includes a protrusion 1470 at the proximal end of the female engagement proximal end 144 that prevents the corresponding first guidance arm 130 from pulling entirely out of the slot 1441 when the handle coupling end 124 engages the threaded hole 341 in the first guidance arm 130 .
- FIG. 8 illustrates the steps involved in performing a sacroiliac joint fusion procedure using the alignment guide 100 according to an illustrative embodiment of the invention.
- FIGS. 9A-9K illustrates the sacroiliac joint fusion alignment guide and related instruments during the steps shown in FIG. 8 .
- the sacroiliac joint is first prepared for the sacroiliac joint fusion procedure in steps 810 and 820 .
- a surgical coring instrument 811 is used to core through the ilium 12 using a posterior approach to the sacroiliac joint 10 through an incision 815 .
- the same or a different surgical tool 811 is used to clean out the cartilage in the sacroiliac joint to create a cored-out sacroiliac joint 10 ′, as shown in FIG. 9C .
- the pronged distal end 132 of the first guidance arm 130 is inserted through the incision 815 into the cored out area of a sacroiliac joint 10 ′, as shown in FIG. 9D .
- the second guidance arm 140 is located outside the patient's body to define the trajectory 160 extending laterally from the sacroiliac joint 10 ′ outside the body.
- the pronged distal end 132 contacts but is not fixed or attached to the sacrum 11 , ilium, or sacroiliac joint 10 ′ to allow for the movement of the distal end of the second guidance arm 140 relative to the distal end of the first guidance arm 130 in multiple degrees of freedom.
- alignment guide 10 may be maneuvered and pivoted about the pronged distal end 132 by the surgeon to find a proper trajectory 160 from the distal end of the second guidance arm 140 to the pronged distal end of the first guidance arm 130 inserted in the sacroiliac joint.
- the distal end 132 of the first guidance arm 130 may be maneuvered within the sacroiliac joint 10 ′ to find a proper trajectory. After determining the proper trajectory, the surgeon holds the alignment guide in place during subsequent steps.
- the surgeon may deliver one or more instruments along the trajectory to prepare for positioning one or more bone anchors through the sacroiliac joint and may subsequently insert one or more bone anchors along the trajectory to fix the sacrum to the ilium at the sacroiliac joint.
- the following steps provide one exemplary method of preparing for and placing bone anchors at the sacroiliac joint.
- One of ordinary skill in the art will recognize some of the exemplary steps may be deleted, or occur in alternative order or additional conventional surgical steps may be added.
- step 840 shown in FIG. 9E , the distal end of an obturator 841 , or other selected surgical instrument, slides through the receiving bore 1421 of the second guidance arm 140 and passes through a lateral incision 816 into the patient's body, until the distal end rests on the surface of the iliac crest. Due to the configuration of the alignment guide 100 , the obturator 841 extends and slides along the trajectory 160 defined by the alignment guide 100 .
- the obturator 841 is cannulated and oriented so that a guidewire can pass through a passage therein into the iliac crest through the sacroiliac joint 10 and into the sacrum 11 in the trajectory of the screw placement.
- a guidewire 950 is then inserted through the obturator 841 into the ilium and across the sacroiliac joint 10 , shown in FIG. 9F .
- the guidewire 950 is inserted to a desired depth by reading index marks corresponding to the obturator 841 .
- step 860 shown in FIG.
- the obturator 841 is slid out from the proximal guidance arm 140 of the alignment guide, leaving the guidewire 950 in place, such that the guidewire 950 extends from the sacroiliac joint 10 out of the patient's body along the selected trajectory 160 .
- the alignment guide 100 may be removed, as shown in FIG. 9H , by pulling the alignment guide 100 in a direction away from the guidewire 950 , leaving the guidewire in place.
- the guidewire 950 passes through the bottom opening 1422 in the receiving bore 1421 of the second guidance arm 140 and from the pronged distal end 132 of the first guidance arm 130 as the alignment guide 100 is removed.
- the obturator 841 may be re-inserted along the trajectory 160 into the wound over the guidewire 950 defining the trajectory 160 .
- a first cannula 892 slides into position over the inserted obturator 841 and the obturator 841 is removed, as shown in FIG. 9I .
- a cannulated drill having a drill stop is attached thereto and set to a desired depth, is inserted over the guidewire 950 , and through the cannula 892 , and drills a screw hole 906 along the trajectory 160 to the preset depth through the iliac crest 11 into the sacroiliac joint 10 ′, as shown in FIG. 9I .
- a first screw 955 is inserted into the iliac crest through the sacroiliac joint 10 and into the sacrum 11 along the trajectory 160 defined by the guidewire 950 , as shown in FIG. 9J .
- the screw may be inserted by removing the drill and cannula and inserting the screw 955 on a self-retaining screwdriver 908 .
- the screw 955 is then inserted over the guidewire 950 and into the screw hole 906 .
- the guidewire 950 precisely placed using the alignment guide, precisely guides the trajectory of the screw 955 during placement. During drilling, the surgeon can place dilators over the obturator to protect the soft tissue.
- Steps 830 - 910 may be repeated for a multiple screws 956 , shown in FIG. 9K , which is placed along a second trajectory 170 defined using the alignment guide 100 , as described above.
- the surgeon may fill or pack the sacroiliac joint with bone graft 990 around the screws 955 and 956 cause fusion of the sacroiliac joint 10 in step 920 .
- a sacroiliac joint fusion alignment guide 100 ′ may include an adjustable attachment piece 190 defining a second trajectory 170 with an adjustment knob 192 on the second guidance arm 140 .
- the rigid receiving bore 1421 ′ on the distal end of the second arm 140 may be split to form both a bottom opening 1422 and an upper opening 1423 to allow removal of the alignment guide 100 ′ once more than one guidewire is placed.
- the prongs 1321 ′, 1322 ′ on the pronged distal end 132 ′ of the first guidance arm 130 are longer than the embodiment shown in FIGS.
- the illustrative attachment piece 190 has an open bottom end 191 to allow removal of the alignment guide 100 ′ over surgical implements, such as a guidewire.
- the adjustment knob 192 allows for adjustment of the distance D between the trajectory 160 defined by the lower receiving bore 1421 ′ and the trajectory 170 defined by the attachment piece 190 .
- a first guidewire may be inserted using the instruments and trajectory 160 between the lower receiving bore 1421 ′ and the pronged distal end 132 ′ as described above with respect to FIG. 8 .
- a second guidewire may be inserted along the trajectory 170 defined by the adjustment piece 190 and the pronged distal end 132 ′.
- a second obturator is placed through the adjustable attachment piece 190 until the obturator rests on the surface of the iliac crest.
- the second guidewire is then inserted through the sacroiliac joint along the trajectory 170 .
- the alignment guide 100 ′ is then removed by pulling the alignment guide 100 ′ in a direction perpendicular and away from the two inserted guidewires, leaving the guidewires and obturators in place, all of which extend along and define one of the trajectories 160 or 170 . Then, screw holes are drilled along the trajectories 160 and 170 through the iliac crest into the sacroiliac joint using a cannulated drill passed over the guidewires. Dilators may be placed over the obturators prior to removal to protect soft tissue during the drilling procedure. A screw is then inserted over each guidewire and placed into the iliac crest through the sacroiliac joint and into the sacrum along the corresponding trajectory. Then, as described above, the sacroiliac joint is packed with bone graft around the screws.
- the sacroiliac joint fusion alignment guide of the illustrative embodiments of the invention provides a precise trajectory for guiding surgical tools and implants during a surgical procedure, while allowing degrees of freedom to facilitate determination of an optimal orientation for the trajectory.
- the pronged distal end of the first guidance arm may be easily inserted into a small space in the sacroiliac joint, allowing maneuverability of the alignment guide to determine a suitable trajectory.
- the design of the guide also accommodates multiple patient anatomies and allows the surgical procedure to be performed in a minimally invasive manner thereby reducing tissue trauma and blood loss while minimizing incision size.
Abstract
A device and method for defining a trajectory for instruments in a sacroiliac joint fusion procedure employs a handle and two movable guidance arms that are separated by an adjustable distance. The first guidance arm has a substantially straight pronged distal end terminating in a first prong, a second prong and a space between the first prong and second prong defining a first point in a straight trajectory for inserting screws into a sacroiliac joint. The guidance arm forms a receiving bore on a distal end thereof to define a second point in the trajectory. The pronged distal end is inserted through a posterior incision in the patient into a cored-out sacroiliac joint, with the second guidance arm outside the body, and the orientation of the alignment guide is adjusted by pivoting the alignment guide about the pronged distal end to determine a suitable trajectory. Instruments and implements are placed along the trajectory and guided by the alignment guide to drill screw holes and insert screws used in the sacroiliac joint fusion procedure into the screw holes.
Description
- The present invention relates to a device and method for applying screws to fuse a sacroiliac joint in a patient.
- The sacroiliac (SI)
joint 10 is located between thesacrum 11 and thehip bones 12, known as the ilium, in the human body, as shown inFIG. 1 , and functions to transmit forces from thespine 14, includingvertebrae 14 a,intervertebral discs 14 b and thecoccyx 14 c, to the lower extremities. Thesacroiliac joint 10 is supported by ligaments and muscle. Thesacroiliac joint 10 can degenerate over time, requiring a fusion procedure to stabilize the degenerated segment. For example, one condition, degenerative sacroiliitis, results in a narrow joint space with bone spur formation. Iatrogenic (i.e., induced by treatment) procedures, such as iliac bone graft damaging ligaments of the joint and/or previous fusions, can also cause degeneration, requiring sacroiliac joint fusion. Alternatively, infection, ligamentous disruption due to pregnancy, and/or trauma causing fracture dislocation may require a sacroiliac joint fusion procedure to provide sufficient stabilization to allow the patient to achieve a normal lifestyle. - Traditionally, surgeons use screws, often with the combination of rods, to link the sacroiliac joint together. A standard sacroiliac stabilization procedure consists of the following steps: a posterior exposure to the spine, the removal of degenerated sacroiliac joint material, the posterior placement of a stabilizing screw/joint construct, or the lateral placement of screws directly through the sacroiliac joint, and, finally, the substitution of bone graft into the joint, which subsequently fuses to stabilize the sacroiliac joint region.
- To place stabilizing screws laterally in the sacroiliac joint region, a surgeon makes a secondary incision and drives screws through the external table of the iliac crest through the sacroiliac joint and into the sacrum. The trajectory of these screws is critical. If a surgeon places screws on a path too anterior, the screws may penetrate the sacral wall and damage the vessels that lie just beyond. If a surgeon places screws on a path too posterior, the screws may penetrate the sacral wall or sacral foramina and damage the nerves of the cauda aquina. Achieving and maintaining a precise trajectory can be difficult in the limited operating space. Therefore, a device to precisely guide the trajectory of the screws is optimal in a sacroiliac joint stabilization procedure.
- The present invention provides a sacroiliac joint fusion alignment guide to allow accurate screw placement through the sacroiliac joint during a sacroiliac joint stabilization procedure. The sacroiliac joint fusion alignment guide is adjustable to allow use with varying patient anatomies. The sacroiliac joint fusion alignment guide includes a handle and two adjustable guidance arms for defining a trajectory for guiding screws and other instruments used in the sacroiliac joint stabilization procedure.
- The first guidance arm has a substantially straight pronged distal end terminating in a first prong, a second prong and a space between the first prong and second prong defining a first point in a straight trajectory for inserting screws into a sacroiliac joint. The guidance arm forms a receiving bore on a distal end thereof to define a second point in the trajectory. The pronged distal end is inserted through a posterior incision in the patient into a cored-out sacroiliac joint, with the second guidance arm outside the body, and the orientation of the alignment guide is adjusted by pivoting the alignment guide about the pronged distal end to determine a suitable trajectory. Instruments are placed along the trajectory and guided by the alignment guide to drill screw holes and insert screws used in the sacroiliac joint fusion procedure into the screw holes.
- According to one aspect of the invention, a sacroiliac joint fusion alignment guide is provided. The sacroiliac joint fusion alignment guide comprises a handle, a first guidance arm connected to the handle having a substantially straight pronged distal end terminating in a first prong, a second prong and a space between the first prong and second prong defining a first point in a straight trajectory for inserting screws into a sacroiliac joint and a second guidance arm coupled to the first guidance arm forming a receiving bore on a distal end thereof to define a second point in the trajectory.
- According to another aspect of the invention, a method of guiding screws into a sacroiliac joint of a patient comprises the steps of inserting a pronged distal end of an alignment guide through a posterior incision in the patient into a cored-out sacroiliac joint and adjusting the orientation of the alignment guide to determine a suitable trajectory, defined by the alignment guide, for the screws, the trajectory extending from the sacroiliac joint through an iliac crest and out of the patient.
- According to still another aspect of the invention, a method of guiding screws into a sacroiliac joint of a patient comprises the steps of providing an alignment guide comprising a handle, a first guidance arm having a distal end defining a first portion of a trajectory for inserting screws used to fuse the sacroiliac joint, and a second guidance arm having a distal end defining a second portion of the trajectory and using the alignment guide to insert screws along the trajectory and into the sacroiliac joint.
- The foregoing and other objects, features and advantages of the invention will be apparent from the following description and apparent from the accompanying drawings, in which like reference characters refer to the same parts throughout the different views. The drawings illustrate principles of the invention and, although not to scale, show relative dimensions
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FIG. 1 illustrates the region of the human body containing the sacroiliac joint targeted using a sacroiliac joint fusion alignment guide of an illustrative embodiment of the invention. -
FIG. 2 illustrates an embodiment of a sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention. -
FIG. 3 is an exploded view of the sacroiliac joint fusion alignment guide ofFIG. 2 . -
FIG. 4A is a front view of the sacroiliac joint fusion alignment guide ofFIG. 2 . -
FIG. 4B is a side view of the sacroiliac joint fusion alignment guide ofFIG. 2 . -
FIGS. 5A and 5B illustrates the handle of the sacroiliac joint fusion alignment guide ofFIG. 2 according to one embodiment of the invention. -
FIGS. 6A-6E illustrate the first guidance arm of the sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention. -
FIGS. 7A-7E illustrate the second guidance arm of the sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention. -
FIG. 8 is a flow chart illustrating a sacroiliac fusion procedure using a sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention. -
FIGS. 9A-9K illustrates the sacroiliac joint fusion alignment guide and related instruments during the steps shown inFIG. 8 . -
FIG. 10 illustrates a sacroiliac joint fusion alignment guide according to another embodiment of the invention. - The present invention provides an improved surgical device and method for performing a sacroiliac joint fusion procedure. The present invention will be described below relative to certain exemplary embodiments in spinal surgery to provide an overall understanding of the principles of the structure, function, manufacture, and use of the instruments disclosed herein. Those skilled in the art will appreciate that the present invention may be implemented in a number of different applications and embodiments and is not specifically limited in its application to the particular embodiments depicted herein. For example, while the illustrative embodiment of the invention relates to a sacroiliac joint fusion alignment guide used in sacroiliac joint fusion surgery, the sacroiliac joint fusion alignment guide may be used in any surgical process where a trajectory is used to guide instruments to a surgical site.
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FIGS. 2-4B illustrate an embodiment of a sacroiliac joint fusion alignment guide according to an illustrative embodiment of the invention. The illustrative sacroiliac jointfusion alignment guide 100 comprises ahandle 120, afirst guidance arm 130 for providing guidance to surgical devices at a distal end thereof, and asecond guidance arm 140 for providing guidance to surgical instruments at a distal end thereof. The two guidance arms cooperate to define astraight trajectory 160 for guiding instruments and implements used in a sacroiliac joint fusion procedure or other surgical procedure. The first guidance arm 130 and thesecond guidance arm 140 slidably engage to allow device adjustment of the length L between theguidance arms - The
handle 120, shown in detail inFIGS. 5A and 5B , may be removable coupled to thefirst guidance arm 130 and/or thesecond guidance arm 140. Thehandle 120 includes a grippingend 122 that a surgeon may hold and acoupling end 124. Thecoupling end 124 may includethreads 125 or other suitable coupling means for coupling thehandle 120 to one or both of theguidance arms 130 and/or 140. The coupling mechanism is not limited to the illustrative threads and may comprise any suitable coupling means. - As shown in detail in
FIGS. 6A-6E , thefirst guidance arm 130 includes a prongeddistal end 132 for defining thetrajectory 160 and a male engagementproximal end 134. The prongeddistal end 132 includes afirst prong 1321 and asecond prong 1322. Thespace 1324 in the notch between thefirst prong 1321 andsecond prong 1322, shown inFIG. 6E , defines a portion of thetrajectory 160 for receiving and guiding instruments during a surgical procedure, such as a sacroiliac joint fusion procedure. Theprongs space 1324 formed therebetween. - In the illustrative embodiment, pronged
distal end 132 is tapered to facilitate insertion of thefirst guidance arm 130 into the sacroiliac joint 10. As shown inFIG. 6D , thedistal end 132 includessurfaces distal end 132 is preferably bent in a direction away from the male engagementproximal end 134. In the illustrative embodiment, the prongeddistal end 132 extends substantially perpendicular to the male engagementproximal end 134, but one skilled in the art will recognize that the prongeddistal end 132 and male engagementproximal end 134 may have any suitable orientation relative to each other. Preferably, thedistal end 132 is substantially straight from the curved portion defining the transition between thedistal end 132 and the male engagementproximal end 134 to facilitate insertion of thedistal end 132 into relatively small incision. - The male engagement
proximal end 134 of the first guidance arm includes a coupling means, illustrated as a threadedhole 341 on a top surface thereof for coupling to thehandle 120. The coupling means may comprise any suitable means for receiving and/or coupling to thehandle 120. - The male engagement
proximal end 134 is also configured to movably couple to thesecond guidance arm 140. In the illustrative embodiment, the male engagementproximal end 134 includes anupper portion 1342 and alower portion 1341 that is wider than the upper portion to defineflanges proximal end 134, as shown inFIG. 6C . Thetip 1345 of the illustrative male engagementproximal end 134 of thefirst guidance arm 130 is rounded, but one skilled in the art will recognize that thetip 1345 can have any suitable configuration. - As shown in
FIG. 7A-7E , thesecond guidance arm 140 of the sacroiliac jointfusion alignment guide 100 includes an attachmentdistal end 142 defining thetrajectory 160 and a female engagementproximal end 144 for receiving the male engagementproximal end 134 of thefirst guidance arm 130. The attachmentdistal end 142 of thesecond guidance arm 140 includes a receivingbore 1421 configured to accept a shaft having an arbitrary cross-section defining a portion of thetrajectory 160. The longitudinal axis of the receivingbore 1421 aligns with thetrajectory 160. An obturator and/or another surgical instrument can pass through the receivingbore 1421 on the distal end of thesecond guidance arm 140, as described in detail below. Alocking mechanism 1428 shown inFIG. 3 , such as a set screw inserted in alocking bore 1429, may be used to lock an obturator within the receivingbore 1421. The receivingbore 1421 may have any suitable size and shape suitable for defining the trajectory and for guiding instruments during a surgical procedure. The receiving bore 1421 preferably has an openbottom end 1422 to allow movement of theguidance device 100 away from an instrument received in the receivingbore 1421. - The attachment
distal end 142 is bent away from the axis of the female engagementproximal end 144. In the illustrative embodiment, the attachmentdistal end 142 extends substantially perpendicular to the female engagementproximal end 144, but one skilled in the art will recognize that the attachmentdistal end 142 and female engagementproximal end 144 may have any suitable orientation relative to each other. - The
first guidance arm 130 engages with thesecond guidance arm 140 via the male and female engagement proximal ends 134, 144, respectively. As shown inFIGS. 7A-7E , the female engagementproximal end 144 includes aslot 1441 sized and configured to receive the male engagementproximal end 134. Theillustrative slot 1441 has an opentop side 1442, atop portion 1443 and a bottom portion 1444 that is wider than the top portion, as shown inFIG. 7C , to receive the flanged bottom of the corresponding male engagementproximal end 134. Theflanges lower portion 1341 of the male engagement proximal end engage the side walls in the bottom portion 1444 of the receivingslot 1441 to guide the male engagement proximal end in the slot. - As shown in
FIGS. 2-4B , the receivingbore 1421 aligns with thespace 1324 of the prongdistal end 132 to define two sections of thetrajectory 160. Thehandle 120 attaches to thefirst guidance arm 130 and may provide a means to manipulate thefirst guidance arm 130 within thesecond guidance arm 140, and also to lock the position of the first guidance arm relative to the second guidance arm. In one embodiment, thehandle 120 rotates about its axis to loosen and/or tighten the connection between the guidance arms and/or between thehandle 120 and the guidance arms. - A ratcheting means or other device may be used to control the distance L between the two guidance arms. Alternatively, an infinite number of relative positions may be provided by sliding the guidance arms relative to each other.
- Guiding
posts 1432 are provided to allow ease of translation betweenguidance arms first guidance arm 130 relative to thesecond guidance arm 140. Other guide mechanisms may be provided in place of the guide posts. - Other suitable means for movably coupling the first and
second guidance arms - The second guidance arm (or the first guidance arm) may contain a stop to prevent the guidance arms from separating when the handle is in place. For example, the illustrative
second guidance arm 140 includes aprotrusion 1470 at the proximal end of the female engagementproximal end 144 that prevents the correspondingfirst guidance arm 130 from pulling entirely out of theslot 1441 when thehandle coupling end 124 engages the threadedhole 341 in thefirst guidance arm 130. -
FIG. 8 illustrates the steps involved in performing a sacroiliac joint fusion procedure using thealignment guide 100 according to an illustrative embodiment of the invention.FIGS. 9A-9K illustrates the sacroiliac joint fusion alignment guide and related instruments during the steps shown inFIG. 8 . - The sacroiliac joint is first prepared for the sacroiliac joint fusion procedure in
steps first step 810, shown inFIG. 9A , asurgical coring instrument 811 is used to core through theilium 12 using a posterior approach to the sacroiliac joint 10 through anincision 815. Instep 820, shown inFIG. 9B , the same or a differentsurgical tool 811 is used to clean out the cartilage in the sacroiliac joint to create a cored-out sacroiliac joint 10′, as shown inFIG. 9C . - After preparing the sacroiliac joint 10, in
step 830, the prongeddistal end 132 of thefirst guidance arm 130 is inserted through theincision 815 into the cored out area of a sacroiliac joint 10′, as shown inFIG. 9D . Thesecond guidance arm 140 is located outside the patient's body to define thetrajectory 160 extending laterally from the sacroiliac joint 10′ outside the body. Preferably, the prongeddistal end 132 contacts but is not fixed or attached to thesacrum 11, ilium, or sacroiliac joint 10′ to allow for the movement of the distal end of thesecond guidance arm 140 relative to the distal end of thefirst guidance arm 130 in multiple degrees of freedom. For example,alignment guide 10 may be maneuvered and pivoted about the prongeddistal end 132 by the surgeon to find aproper trajectory 160 from the distal end of thesecond guidance arm 140 to the pronged distal end of thefirst guidance arm 130 inserted in the sacroiliac joint. Likewise, thedistal end 132 of thefirst guidance arm 130 may be maneuvered within the sacroiliac joint 10′ to find a proper trajectory. After determining the proper trajectory, the surgeon holds the alignment guide in place during subsequent steps. - Once the surgeon has selected the proper trajectory, the surgeon may deliver one or more instruments along the trajectory to prepare for positioning one or more bone anchors through the sacroiliac joint and may subsequently insert one or more bone anchors along the trajectory to fix the sacrum to the ilium at the sacroiliac joint. The following steps provide one exemplary method of preparing for and placing bone anchors at the sacroiliac joint. One of ordinary skill in the art will recognize some of the exemplary steps may be deleted, or occur in alternative order or additional conventional surgical steps may be added.
- In
step 840, shown inFIG. 9E , the distal end of anobturator 841, or other selected surgical instrument, slides through the receiving bore 1421 of thesecond guidance arm 140 and passes through alateral incision 816 into the patient's body, until the distal end rests on the surface of the iliac crest. Due to the configuration of thealignment guide 100, theobturator 841 extends and slides along thetrajectory 160 defined by thealignment guide 100. - Preferably, the
obturator 841 is cannulated and oriented so that a guidewire can pass through a passage therein into the iliac crest through the sacroiliac joint 10 and into thesacrum 11 in the trajectory of the screw placement. Instep 850, aguidewire 950 is then inserted through theobturator 841 into the ilium and across the sacroiliac joint 10, shown inFIG. 9F . Theguidewire 950 is inserted to a desired depth by reading index marks corresponding to theobturator 841. Instep 860, shown inFIG. 9G , theobturator 841 is slid out from theproximal guidance arm 140 of the alignment guide, leaving theguidewire 950 in place, such that theguidewire 950 extends from the sacroiliac joint 10 out of the patient's body along the selectedtrajectory 160. - In
step 870, thealignment guide 100 may be removed, as shown inFIG. 9H , by pulling thealignment guide 100 in a direction away from theguidewire 950, leaving the guidewire in place. Theguidewire 950 passes through thebottom opening 1422 in the receiving bore 1421 of thesecond guidance arm 140 and from the prongeddistal end 132 of thefirst guidance arm 130 as thealignment guide 100 is removed. - In
step 880, theobturator 841 may be re-inserted along thetrajectory 160 into the wound over theguidewire 950 defining thetrajectory 160. Instep 890, afirst cannula 892 slides into position over the insertedobturator 841 and theobturator 841 is removed, as shown inFIG. 9I . Then, instep 900, a cannulated drill, having a drill stop is attached thereto and set to a desired depth, is inserted over theguidewire 950, and through thecannula 892, and drills ascrew hole 906 along thetrajectory 160 to the preset depth through theiliac crest 11 into the sacroiliac joint 10′, as shown inFIG. 9I . - In
step 910, afirst screw 955 is inserted into the iliac crest through the sacroiliac joint 10 and into thesacrum 11 along thetrajectory 160 defined by theguidewire 950, as shown inFIG. 9J . The screw may be inserted by removing the drill and cannula and inserting thescrew 955 on a self-retainingscrewdriver 908. Thescrew 955 is then inserted over theguidewire 950 and into thescrew hole 906. Theguidewire 950, precisely placed using the alignment guide, precisely guides the trajectory of thescrew 955 during placement. During drilling, the surgeon can place dilators over the obturator to protect the soft tissue. - Steps 830-910 may be repeated for a
multiple screws 956, shown inFIG. 9K , which is placed along asecond trajectory 170 defined using thealignment guide 100, as described above. After insertion of thescrews bone graft 990 around thescrews step 920. - According to another embodiment of the invention, shown in
FIG. 10 , a sacroiliac jointfusion alignment guide 100′ may include anadjustable attachment piece 190 defining asecond trajectory 170 with anadjustment knob 192 on thesecond guidance arm 140. Therigid receiving bore 1421′ on the distal end of thesecond arm 140 may be split to form both abottom opening 1422 and anupper opening 1423 to allow removal of thealignment guide 100′ once more than one guidewire is placed. As shown, theprongs 1321′, 1322′ on the prongeddistal end 132′ of thefirst guidance arm 130 are longer than the embodiment shown inFIGS. 2-7 , such that thespace 1324′ between theprongs 1321′, 1322′ aligns with both the receiving bore 1421′ and theadjustable attachment piece 190. Theillustrative attachment piece 190 has an openbottom end 191 to allow removal of thealignment guide 100′ over surgical implements, such as a guidewire. Theadjustment knob 192 allows for adjustment of the distance D between thetrajectory 160 defined by thelower receiving bore 1421′ and thetrajectory 170 defined by theattachment piece 190. - During a fusion procedure using the
alignment guide 100′ ofFIG. 10 , a first guidewire may be inserted using the instruments andtrajectory 160 between thelower receiving bore 1421′ and the prongeddistal end 132′ as described above with respect toFIG. 8 . A second guidewire may be inserted along thetrajectory 170 defined by theadjustment piece 190 and the prongeddistal end 132′. To insert the second guidewire, a second obturator is placed through theadjustable attachment piece 190 until the obturator rests on the surface of the iliac crest. The second guidewire is then inserted through the sacroiliac joint along thetrajectory 170. Thealignment guide 100′ is then removed by pulling thealignment guide 100′ in a direction perpendicular and away from the two inserted guidewires, leaving the guidewires and obturators in place, all of which extend along and define one of thetrajectories trajectories - The sacroiliac joint fusion alignment guide of the illustrative embodiments of the invention provides a precise trajectory for guiding surgical tools and implants during a surgical procedure, while allowing degrees of freedom to facilitate determination of an optimal orientation for the trajectory. The pronged distal end of the first guidance arm may be easily inserted into a small space in the sacroiliac joint, allowing maneuverability of the alignment guide to determine a suitable trajectory. The design of the guide also accommodates multiple patient anatomies and allows the surgical procedure to be performed in a minimally invasive manner thereby reducing tissue trauma and blood loss while minimizing incision size.
- The present invention has been described relative to an illustrative embodiment and application in spinal correction surgery. Since certain changes may be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings be interpreted as illustrative and not in a limiting sense.
- It is also to be understood that the following claims are to cover all generic and specific features of the invention described herein, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.
Claims (23)
1. A sacroiliac joint fusion alignment guide, comprising:
a handle;
a first guidance arm connected to the handle having a substantially straight pronged distal end terminating in a first prong, a second prong and a space between the first prong and second prong defining a first point in a straight trajectory for inserting screws into a sacroiliac joint; and
a second guidance arm coupled to the first guidance arm forming a receiving bore on a distal end thereof to define a second point in the trajectory.
2. The sacroiliac joint fusion alignment guide of claim i, wherein the receiving bore has an open bottom end.
3. The sacroiliac joint fusion alignment guide of claim 1 , wherein the distance between the first guidance arm and the second guidance arm is adjustable.
4. The sacroiliac joint fusion alignment guide of claim 1 , wherein the first guidance arm includes a proximal engagement end bent away from the distal end for coupling to the second guidance arm.
5. The sacroiliac joint fusion alignment guide of claim 1 , wherein the second guidance arm includes a proximal engagement end comprising a slot configured to receive the proximal engagement end of the first guidance arm.
6. The sacroiliac joint fusion alignment guide of claim 5 , wherein the proximal engagement end of the first guidance arm includes flanges configured to engage side recesses in the slot of the second guidance arm.
7. The sacroiliac joint fusion alignment guide of claim 5 , wherein the proximal engagement end of the second guidance arm includes bent away from the distal end.
8. The sacroiliac joint fusion alignment guide of claim 5 , wherein the proximal engagement end of the first guidance arm includes a threaded hole for receiving a threaded distal end of the handle to couple the handle to the first guidance arm.
9. The sacroiliac joint fusion alignment guide of claim 1 , wherein the first prong and the second prong on the first guidance arm are tapered and intersect to form a point at the tip of the distal end.
10. The sacroiliac joint fusion alignment guide of claim 1 , further comprising an adjustable attachment guide coupled to the second guidance arm spaced from the receiving bore and defining a second trajectory spaced from the first trajectory.
11. A method of guiding screws into a sacroiliac joint of a patient, comprising the steps of:
inserting a distal end of an alignment guide through a posterior incision in the patient into a cored-out sacroiliac joint; and
adjusting the orientation of the alignment guide to determine a suitable trajectory, defined by the alignment guide, for the screws, the trajectory extending from the sacroiliac joint through an iliac crest and out of the patient.
12. The method of claim 11 wherein the distal end of the alignment guide is pronged.
13. The method of claim 11 , wherein the alignment guide is adjusted in multiple degrees of freedom to select a suitable trajectory.
14. The method of claim 11 , further comprising moving the distal end of the alignment guide within the sacroiliac joint to select a suitable trajectory.
15. The method of claim 11 , further comprising the step of adjusting a distance between two guidance arms on the alignment guide to accommodate patient anatomy.
16. The method of claim 11 , further comprising the step of inserting a guidewire along the trajectory defined by the alignment guide, such that the guidewire extends from the sacroiliac joint along the trajectory and out of the patient.
17. The method of claim 16 , wherein the step of inserting the guidewire comprises the steps of:
inserting an obturator through a receiving bore on a guidance arm on the alignment guide, wherein the receiving bore aligns with the pronged distal end to define the trajectory;
inserting the guidewire through the obturator; and
removing the obturator from the alignment guide; and
removing the alignment guide, leaving the guidewire extending from the sacroiliac joint along the trajectory and out of the patient.
18. The method of claim 16 , further comprising the step of drilling a screw hole into the sacroiliac joint following the trajectory using a cannulated drill inserted over the guidewire.
19. The method of claim 18 , further comprising the step of inserting a screw into the drill hole.
20. A method of guiding screws into a sacroiliac joint of a patient, comprising the steps of:
providing an alignment guide comprising a first guidance arm having a distal end defining a first portion of a trajectory and a second guidance arm having a distal end defining a second portion of the trajectory;
adjusting the distal end of the second guidance arm in t multiple degrees of freedom to adjust the trajectory; and
using the alignment guide to insert screws along the trajectory and into the sacroiliac joint.
21. The method of claim 20 , wherein the step of using the alignment guide to insert screws comprises the steps of:
inserting the distal end of the first guidance arm into the sacroiliac joint, such that the distal end engages a sacrum and provides the trajectory extending from the sacroiliac joint through an iliac crest;
passing a guidewire through the distal ends of the first and second guidance arms into the ilium and across the sacroiliac joint, such that the guidewire extends along the trajectory.
22. The method of claim 21 , further comprising the steps of:
drilling a screw hole into the sacroiliac joint following the trajectory using a cannulated drill inserted over the guidewire; and
inserting a screw into the screw hole.
23. The method of claim 20 , wherein the alignment guide contacts bone of the sacroiliac joint at the distal end of the first guidance arm and is allowed to pivot freely around the distal end of the first guidance arm to determine a proper trajectory.
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