US20090030519A1 - Intervertebral cage designs - Google Patents
Intervertebral cage designs Download PDFInfo
- Publication number
- US20090030519A1 US20090030519A1 US11/764,997 US76499707A US2009030519A1 US 20090030519 A1 US20090030519 A1 US 20090030519A1 US 76499707 A US76499707 A US 76499707A US 2009030519 A1 US2009030519 A1 US 2009030519A1
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- United States
- Prior art keywords
- implant
- cage
- shows
- back wall
- sidewalls
- Prior art date
- 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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- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
-
- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2002/4625—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use
- A61F2002/4627—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2002/4629—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof connected to the endoprosthesis or implant via a threaded connection
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4635—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor using minimally invasive surgery
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0091—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0009—Special features of prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting thickness
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0085—Identification means; Administration of patients
- A61F2250/0087—Identification means; Administration of patients colour-coded
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00Â -Â A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers
Definitions
- This invention relates generally to spinal implants and, in particular, to improved intervertebral cage designs.
- intervertebral implants to assist with stabilization and fixation, including pre-assembled mesh rings of varying size; cylindrical threaded cages; carbon fiber boxes; and bone dowels, rings, and wedges.
- all existing devices have certain drawbacks, including the requirement of multiple steps and tools to prepare and mold the intervertebral plates for acceptance of the devices.
- Existing implants also exhibit the need to remove/move a distraction device such as a spreader or plugs around a decorticate. Such plugs/distraction devices often get in the way of cage placement. Mesh cages in bone materials can deform or break with attempts to force them into the inner space. Typically, only a small surface of the end plate is exposed to bone graft, this being dictated by the size and position of the cage. Existing devices also require large trays with many instruments and many cages, and it is difficult to see the bone fused in mass inside metal cages, which are radiopaque.
- This invention resides in cage systems that improve upon the prior art in various ways.
- devices are radiolucent, with markers, thereby allowing visualization of placement without excessive obscuration.
- Devices according to the invention eliminate multiple steps, instruments and trays, while being capable of a custom fit.
- the devices according to the invention permit easier and greater access to end plate surface area, and can be used with autografts, allografts, and biologics.
- FIG. 1 is a drawing that shows a preferred embodiment of the invention
- FIG. 2A is a drawing which shows a contoured, wedge-shaped retractor
- FIG. 2B shows a side view of a U-shaped introducer
- FIG. 2C shows a top view of the U-shaped introducer
- FIG. 2D shows the U-shaped introducer received within a cage
- FIG. 2E is a side view of a graft impactor
- FIG. 2F is a side view of the graft impactor but with an end view of the impactor tip;
- FIG. 2G shows a gate holder with a screw mechanism used to capture and release a gate
- FIG. 2H is a drawing of a screwdriver
- FIG. 3A shows cage shapes for levels L 2 -L 5 ;
- FIG. 3B shows cage shapes for levels L 5 /S 1 ;
- FIG. 3C shows cage shapes for levels T/L 2 ;
- FIG. 4A shows how disc material is removed to determine the lateral extent of a disc space
- FIG. 4B is a drawing that shows a disc space being dilated to a desired height using distracters which are preferably color coded;
- FIG. 4C shows a cage being inserted
- FIG. 4D illustrates how, with the implant released and the introducer tool removed, easy access is available to the end plates
- FIG. 4E shows how end plates are prepared, and grafting material, biologics, and so forth are packed in
- FIG. 5A is a first view of an implant according to the invention.
- FIG. 5B is a second view of an implant according to the invention.
- FIG. 6A is a drawing that shows how a proximal guide sleeve is attached onto one vertical side wall of the cage and drilled and tapped as necessary;
- FIG. 6B shows a locking screw in position
- FIG. 6C shows how a universal screw driver/holder is used to place distal screws into the cage
- FIG. 6D depicts the lower aspect of a cage being locked into a distal vertebrae
- FIG. 6E is a lateral view of a cage in place
- FIG. 6F is an anterior-posterior (AP) view of a cage in place
- FIG. 7A begins a series of drawings that depict an alternative embodiment of the invention including a different form of anterior fixation
- FIG. 7B shows how a fixation jig is used to introduce a screw or similar device through the intervertebral body proximally into the superior cage walls
- FIG. 7C shows how inferior fixation is accomplished with a ratchet screwdriver/holder to deliver a fastener through the inferior wall of the cage into the vertebral body
- FIG. 7D is a drawing that shows how the screw preferably angles out laterally
- FIG. 7E depicts a fixed cage in place
- FIG. 8A shows the anchoring screw being pushed
- FIG. 8B shows the pins advanced
- FIG. 8C shows the device in-situ
- FIG. 9A shows the hinged contoured back wall with the inserter prior to use
- FIG. 9B shows the back wall being straightened and the side walls being spaced apart
- FIG. 10A illustrates a different embodiment involving a sliding lateral expandable cage with locking screws
- FIG. 10B shows an expanded condition with the locking screws being used to stabilize the structure at a desired level of expansion.
- FIG. 1 A first preferred embodiment of the invention is depicted in FIG. 1 .
- This design includes an open-faced cage 102 , which is constructed of carbon fiber or other radiolucent material but for small dot radiopaque markers (not shown).
- the device includes a contoured dome-shaped side walls 104 , 104 ′ with a flat trapezoidal undersurface. Separate cages and tools may be used for the L 5 -S 1 levels with more pronounced trapezoidal shapes.
- An indented back wall 110 is used to prevent neurocompression.
- the side walls preferably include a recessed face with nippled intents 112 and screw holes 114 to receive a locking screw 116 .
- a closing face gate 120 is provided with non-slip nipples and locking screw holes as well.
- the use of an open-face plate with gate and locking screw mechanism allows the device to be packed and closed in-situ, thereby effectively assembling the cage between the vertebrae. Note that although this design includes numerous features which are believed to be novel, they need not be used entirely in combination, but may be used separately or combined in subsets.
- the side view at the right in FIG. 1 illustrates the optional use of sawtooth features 125 on the upper surface 130 , which is preferably dome-shaped, and the lower surface 140 , which is preferably flat.
- FIG. 2 is a series of drawings which shows the instruments used to implant devices according to the invention. Most or all are removably attached able to a ratchet handle 200 .
- the set includes a screwdriver 202 ( FIG. 2H ); contoured, wedge-shaped retractors 206 , preferably including a color-coded raised centering mark or ridge 207 ( FIG. 2A ); U-shaped introducers 208 ( FIG. 2B ), preferably including retractable wings 209 ( FIG. 2C ) to release a cage 210 ( FIG. 2D ) using control 211 ; graft impactors 220 ( FIGS.
- the impactors 230 are generally 25 in length, and preferably come in different sizes, such as 0.8 cm at one end and 1-2 cm at the other, 0.5 cm at one end and 1 cm or less at the other, and so forth.
- FIG. 3 shows how cage shapes would preferably be varied for different vertebral levels.
- FIG. 3A shows cage shapes for L 2 -L 5 ;
- FIG. 3B shows cage shapes for L 5 /S 1 ; and
- FIG. 3C shows cage shapes for T/L 2 .
- the implants would preferably utilize some or all of the other geometries described herein, including a general U-shaped construction, crescent-shaped side walls, domed tops, indented back wall, carbon fiber or other radiolucent construction with markers, serrated or tooth-edged, end-plate surfaces, and so forth.
- the devices would also preferably include correspondingly sized anterior gates, also utilizing carbon fiber or other radiolucent material, with non-slip nipples, locking screw holes and associated screws.
- FIG. 4 is a series of drawings which show a method involving an anterior approach to the intervertebral space.
- disc material is removed with tool 402 to determine the lateral extent of the space.
- FIG. 4B the disc space is dilated to a desired height using distracters 206 which are preferably color coded.
- the final distracter is removed and replaced with the same color-coded implant introducer instrument 208 , with the cage being inserted as shown in FIG. 4C .
- the implant is released and the introducer tool removed, allowing easy access 410 to the end plates as shown in FIG. 4D .
- FIG. 4E the end plates are prepared, and grafting material, biologics, and so forth are packed in.
- FIG. 4F a correspondingly sized anterior gate is locked into position using the gate holder and locking screws and screwdriver, and the wound is closed.
- FIG. 5 begins a series of drawings which shows an alternative embodiment of the invention which allows for an in-situ cage to act as a stand-alone radiolucent cage system.
- this embodiment utilizes proximal left/right guide sleeves, a drill and universal head screwdriver.
- proximal and distal screws are used in conjunction with an in-situ cage having a locking gate, in this case modified to accept proximal screws and guide inferior screws.
- Different views of the implant are shown in FIGS. 5A and 5B .
- FIG. 6A a proximal guide sleeve is attached onto one vertical side wall of the cage and drilled and tapped as necessary, as shown in FIG. 6A .
- the locking screw is shown in place in FIG. 6B .
- the universal screw driver/holder is used to place distal screws into the cage, as shown in FIG. 6C , allowing the lower aspect of the cage to be locked into the distal vertebrae as shown in FIG. 6D .
- FIG. 6E is a lateral view of the cage in place
- FIG. 6F is an A-P view.
- FIGS. 7 and higher depict yet a further alternative embodiment including a different form of anterior fixation.
- a fixation jig 700 is used to introduce a screw or similar device through the intervertebral body proximally into the superior cage walls, as shown in FIG. 7B .
- Inferior fixation is accomplished with a ratchet screwdriver/holder 702 , which delivers the fastener through the inferior wall of the cage into the vertebral body as shown in FIG. 7C .
- the screw preferably angles out laterally, as shown in FIG. 7D , with the fixed cage in place in FIG. 7E .
- FIG. 7D depict yet a further alternative embodiment including a different form of anterior fixation.
- FIG. 8 is a series of drawings which shows internal fixation using an advancing screw to push a fixation pin into the cortical end plate.
- FIG. 8A shows the anchoring screw 802 being pushed
- FIG. 8B shows the pins 804 advanced
- FIG. 8C shows the device in-situ.
- FIG. 9 shows yet a different alternative embodiment of the invention in the form of a collapsing cage suitable for endoscopic placement.
- the cage is hinged enabling it to be laterally expandable with an expandable cage inserter.
- FIG. 9A shows the hinged contoured back wall 902 with the inserter prior to use, and
- FIG. 9B shows the back wall being straightened and the side walls being spaced apart.
- FIG. 10 shows a different embodiment involving a sliding lateral expandable cage 10 with locking screws 12 .
- an expandable cage inserter is used to move the side walls apart from the condition in FIG. 10A to the expanded condition in FIG. 10B with the locking screw being used to stabilize the structure at a desired level of expansion.
Abstract
Description
- This application is a continuation of U.S. patent application Ser. No. 10/691,854, filed Oct. 23, 2003, which claims priority from U.S. Provisional Patent Application Ser. No. 60/420,616, filed Oct. 23, 2002, the entire content of both of which are incorporated herein by reference.
- This invention relates generally to spinal implants and, in particular, to improved intervertebral cage designs.
- There are many intervertebral implants to assist with stabilization and fixation, including pre-assembled mesh rings of varying size; cylindrical threaded cages; carbon fiber boxes; and bone dowels, rings, and wedges. However, all existing devices have certain drawbacks, including the requirement of multiple steps and tools to prepare and mold the intervertebral plates for acceptance of the devices.
- Existing implants also exhibit the need to remove/move a distraction device such as a spreader or plugs around a decorticate. Such plugs/distraction devices often get in the way of cage placement. Mesh cages in bone materials can deform or break with attempts to force them into the inner space. Typically, only a small surface of the end plate is exposed to bone graft, this being dictated by the size and position of the cage. Existing devices also require large trays with many instruments and many cages, and it is difficult to see the bone fused in mass inside metal cages, which are radiopaque.
- This invention resides in cage systems that improve upon the prior art in various ways. In the preferred embodiments, devices are radiolucent, with markers, thereby allowing visualization of placement without excessive obscuration. Devices according to the invention eliminate multiple steps, instruments and trays, while being capable of a custom fit. The devices according to the invention permit easier and greater access to end plate surface area, and can be used with autografts, allografts, and biologics.
-
FIG. 1 is a drawing that shows a preferred embodiment of the invention; -
FIG. 2A is a drawing which shows a contoured, wedge-shaped retractor; -
FIG. 2B shows a side view of a U-shaped introducer; -
FIG. 2C shows a top view of the U-shaped introducer; -
FIG. 2D shows the U-shaped introducer received within a cage; -
FIG. 2E is a side view of a graft impactor; -
FIG. 2F is a side view of the graft impactor but with an end view of the impactor tip; -
FIG. 2G shows a gate holder with a screw mechanism used to capture and release a gate; -
FIG. 2H is a drawing of a screwdriver; -
FIG. 3A shows cage shapes for levels L2-L5; -
FIG. 3B shows cage shapes for levels L5/S1; -
FIG. 3C shows cage shapes for levels T/L2; -
FIG. 4A shows how disc material is removed to determine the lateral extent of a disc space; -
FIG. 4B is a drawing that shows a disc space being dilated to a desired height using distracters which are preferably color coded; -
FIG. 4C shows a cage being inserted; -
FIG. 4D illustrates how, with the implant released and the introducer tool removed, easy access is available to the end plates; -
FIG. 4E shows how end plates are prepared, and grafting material, biologics, and so forth are packed in; -
FIG. 5A is a first view of an implant according to the invention; -
FIG. 5B is a second view of an implant according to the invention; -
FIG. 6A is a drawing that shows how a proximal guide sleeve is attached onto one vertical side wall of the cage and drilled and tapped as necessary; -
FIG. 6B shows a locking screw in position; -
FIG. 6C shows how a universal screw driver/holder is used to place distal screws into the cage; -
FIG. 6D depicts the lower aspect of a cage being locked into a distal vertebrae; -
FIG. 6E is a lateral view of a cage in place; -
FIG. 6F is an anterior-posterior (AP) view of a cage in place; -
FIG. 7A begins a series of drawings that depict an alternative embodiment of the invention including a different form of anterior fixation; -
FIG. 7B shows how a fixation jig is used to introduce a screw or similar device through the intervertebral body proximally into the superior cage walls -
FIG. 7C shows how inferior fixation is accomplished with a ratchet screwdriver/holder to deliver a fastener through the inferior wall of the cage into the vertebral body -
FIG. 7D is a drawing that shows how the screw preferably angles out laterally; -
FIG. 7E depicts a fixed cage in place; -
FIG. 8A shows the anchoring screw being pushed; -
FIG. 8B shows the pins advanced; -
FIG. 8C shows the device in-situ; -
FIG. 9A shows the hinged contoured back wall with the inserter prior to use; -
FIG. 9B shows the back wall being straightened and the side walls being spaced apart; -
FIG. 10A illustrates a different embodiment involving a sliding lateral expandable cage with locking screws; and -
FIG. 10B shows an expanded condition with the locking screws being used to stabilize the structure at a desired level of expansion. - A first preferred embodiment of the invention is depicted in
FIG. 1 . This design includes an open-faced cage 102, which is constructed of carbon fiber or other radiolucent material but for small dot radiopaque markers (not shown). The device includes a contoured dome-shapedside walls indented back wall 110 is used to prevent neurocompression. The side walls preferably include a recessed face withnippled intents 112 and screwholes 114 to receive a lockingscrew 116. A closingface gate 120 is provided with non-slip nipples and locking screw holes as well. - In addition to the dome-shaped contours of the upper end plate, different shapes for the L5-S1 levels, and the indented back wall, the use of an open-face plate with gate and locking screw mechanism allows the device to be packed and closed in-situ, thereby effectively assembling the cage between the vertebrae. Note that although this design includes numerous features which are believed to be novel, they need not be used entirely in combination, but may be used separately or combined in subsets. The side view at the right in
FIG. 1 illustrates the optional use ofsawtooth features 125 on theupper surface 130, which is preferably dome-shaped, and thelower surface 140, which is preferably flat. -
FIG. 2 is a series of drawings which shows the instruments used to implant devices according to the invention. Most or all are removably attached able to a ratchet handle 200. The set includes a screwdriver 202 (FIG. 2H ); contoured, wedge-shapedretractors 206, preferably including a color-coded raised centering mark or ridge 207 (FIG. 2A ); U-shaped introducers 208 (FIG. 2B ), preferably including retractable wings 209 (FIG. 2C ) to release a cage 210 (FIG. 2D ) usingcontrol 211; graft impactors 220 (FIGS. 2E , 2F) andgate holder 230 including a screw mechanism 232 used to capture and release a gate 240 (FIG. 2G ). Theimpactors 230 are generally 25 in length, and preferably come in different sizes, such as 0.8 cm at one end and 1-2 cm at the other, 0.5 cm at one end and 1 cm or less at the other, and so forth. -
FIG. 3 shows how cage shapes would preferably be varied for different vertebral levels.FIG. 3A shows cage shapes for L2-L5;FIG. 3B shows cage shapes for L5/S1; andFIG. 3C shows cage shapes for T/L2. In each case, the implants would preferably utilize some or all of the other geometries described herein, including a general U-shaped construction, crescent-shaped side walls, domed tops, indented back wall, carbon fiber or other radiolucent construction with markers, serrated or tooth-edged, end-plate surfaces, and so forth. The devices would also preferably include correspondingly sized anterior gates, also utilizing carbon fiber or other radiolucent material, with non-slip nipples, locking screw holes and associated screws. -
FIG. 4 is a series of drawings which show a method involving an anterior approach to the intervertebral space. InFIG. 4A , disc material is removed withtool 402 to determine the lateral extent of the space. InFIG. 4B , the disc space is dilated to a desiredheight using distracters 206 which are preferably color coded. The final distracter is removed and replaced with the same color-codedimplant introducer instrument 208, with the cage being inserted as shown inFIG. 4C . The implant is released and the introducer tool removed, allowing easy access 410 to the end plates as shown inFIG. 4D . - In
FIG. 4E , the end plates are prepared, and grafting material, biologics, and so forth are packed in. InFIG. 4F , a correspondingly sized anterior gate is locked into position using the gate holder and locking screws and screwdriver, and the wound is closed.FIG. 5 begins a series of drawings which shows an alternative embodiment of the invention which allows for an in-situ cage to act as a stand-alone radiolucent cage system. In addition to the instruments previously described, this embodiment utilizes proximal left/right guide sleeves, a drill and universal head screwdriver. In terms of the implant itself, proximal and distal screws are used in conjunction with an in-situ cage having a locking gate, in this case modified to accept proximal screws and guide inferior screws. Different views of the implant are shown inFIGS. 5A and 5B . - In terms of the operative procedure, the steps previously described involving cage insertion are followed. However, in this case, a proximal guide sleeve is attached onto one vertical side wall of the cage and drilled and tapped as necessary, as shown in
FIG. 6A . The locking screw is shown in place inFIG. 6B . The universal screw driver/holder is used to place distal screws into the cage, as shown inFIG. 6C , allowing the lower aspect of the cage to be locked into the distal vertebrae as shown inFIG. 6D .FIG. 6E is a lateral view of the cage in place, andFIG. 6F is an A-P view. - Now turning to
FIGS. 7 and higher, which depict yet a further alternative embodiment including a different form of anterior fixation. As shown in this case, afixation jig 700 is used to introduce a screw or similar device through the intervertebral body proximally into the superior cage walls, as shown inFIG. 7B . Inferior fixation is accomplished with a ratchet screwdriver/holder 702 , which delivers the fastener through the inferior wall of the cage into the vertebral body as shown inFIG. 7C . The screw preferably angles out laterally, as shown inFIG. 7D , with the fixed cage in place inFIG. 7E .FIG. 8 is a series of drawings which shows internal fixation using an advancing screw to push a fixation pin into the cortical end plate.FIG. 8A shows the anchoringscrew 802 being pushed,FIG. 8B shows thepins 804 advanced, andFIG. 8C shows the device in-situ. -
FIG. 9 shows yet a different alternative embodiment of the invention in the form of a collapsing cage suitable for endoscopic placement. The cage is hinged enabling it to be laterally expandable with an expandable cage inserter.FIG. 9A shows the hinged contoured backwall 902 with the inserter prior to use, andFIG. 9B shows the back wall being straightened and the side walls being spaced apart.FIG. 10 shows a different embodiment involving a sliding lateralexpandable cage 10 with locking screws 12. Again, an expandable cage inserter is used to move the side walls apart from the condition inFIG. 10A to the expanded condition inFIG. 10B with the locking screw being used to stabilize the structure at a desired level of expansion.
Claims (13)
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