CA2088961A1 - Perpendicular rod connector for spinal fixation device - Google Patents
Perpendicular rod connector for spinal fixation deviceInfo
- Publication number
- CA2088961A1 CA2088961A1 CA002088961A CA2088961A CA2088961A1 CA 2088961 A1 CA2088961 A1 CA 2088961A1 CA 002088961 A CA002088961 A CA 002088961A CA 2088961 A CA2088961 A CA 2088961A CA 2088961 A1 CA2088961 A1 CA 2088961A1
- Authority
- CA
- Canada
- Prior art keywords
- rod
- connector
- spinal
- hooks
- fixation
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7043—Screws or hooks combined with longitudinal elements which do not contact vertebrae with a longitudinal element fixed to one or more transverse elements which connect multiple screws or hooks
Abstract
PERPENDICULAR ROD CONNECTOR
FOR SPINAL FIXATION DEVICE
ABSTRACT OF THE DISCLOSURE
The spinal rod system and perpendicular rod connector of the invention provides for a first rod to be connected by two pedicle screws transverse to the spine across a vertebra. The perpendicular connector is then connected to the first rod anywhere along the rod. The longitudinal spinal rod is then connected to the perpendicular rod connector using common connectors. The perpendicular connector is slidable along the first rod. By using the perpendicular rod connector, the amount of bending and the tolerances required is reduced as the connector may be slid along the transverse rod to accommodate the longitudinal rod. Known pedicle screws may be used with a slight bend placed in the transverse rod to accommodate the spinal column. Alternatively, the pedicle-screws may be bent slightly such that a straight transverse rod may be used.
By using the perpendicular rod connector and transverse rod arrangement t the amount of bending required on the longitudinal rod may be reduced to thereby shorten the entire procedure.
FOR SPINAL FIXATION DEVICE
ABSTRACT OF THE DISCLOSURE
The spinal rod system and perpendicular rod connector of the invention provides for a first rod to be connected by two pedicle screws transverse to the spine across a vertebra. The perpendicular connector is then connected to the first rod anywhere along the rod. The longitudinal spinal rod is then connected to the perpendicular rod connector using common connectors. The perpendicular connector is slidable along the first rod. By using the perpendicular rod connector, the amount of bending and the tolerances required is reduced as the connector may be slid along the transverse rod to accommodate the longitudinal rod. Known pedicle screws may be used with a slight bend placed in the transverse rod to accommodate the spinal column. Alternatively, the pedicle-screws may be bent slightly such that a straight transverse rod may be used.
By using the perpendicular rod connector and transverse rod arrangement t the amount of bending required on the longitudinal rod may be reduced to thereby shorten the entire procedure.
Description
- 1 - 208~961 PERPENDICULAR ROD CONNECTOR
FOR SPINAL FIXA_ION DEVICE
FI:E:LD OF THE INVENTION
This invention relates to spinal fixation devices and has specific reference to a spi~al rod system which connects a spinal rod to a prLmary fixation rod and positions the two rods at a ninety degree relationship to one another.
BACKGROUND OF TH~ INYENTION
It is well known in the correction of spinal deformities to affix a rod or pair of rods longitudinally to the spinal column with a plurality of ~pinal hook6 or pedicle screws. Tension or compression force is applied to the rod between each consecutive ~crew or hook to correct the deformity. It is further common to cross link or interconnect the longitudinal rods to pro~ide additional stabilization or to engage the pinous process. During the surgical procedure to connect the ~pinal rods to the spine, the surg~on must bend the pinal rods to conform, generally, to the curvature of ~he spine~ Quite often this requires the surgeon to bend the rod in three dimensions.
Since the rods must be connected to a pedicle screw or spinal hook, the ~olerances for the bend is exacting. The ~ending of the rods within the tight space available and to tolerance adds a significant amount of tLme to an already lengthy surgeryO
SUMMARY THE INVENTION
The spinal rod system and perpendicular rod connector of the invention provides for a first rod to be connected by two pedicle screws transverse to the spine across a vertebra. The perpendicular connector i~ then connected to the first rod anywhere along the rod. The longitudinal spinal rod is then connected to the perpendicular rod connector using common co~nectors~ The perpendicular 208896~
FOR SPINAL FIXA_ION DEVICE
FI:E:LD OF THE INVENTION
This invention relates to spinal fixation devices and has specific reference to a spi~al rod system which connects a spinal rod to a prLmary fixation rod and positions the two rods at a ninety degree relationship to one another.
BACKGROUND OF TH~ INYENTION
It is well known in the correction of spinal deformities to affix a rod or pair of rods longitudinally to the spinal column with a plurality of ~pinal hook6 or pedicle screws. Tension or compression force is applied to the rod between each consecutive ~crew or hook to correct the deformity. It is further common to cross link or interconnect the longitudinal rods to pro~ide additional stabilization or to engage the pinous process. During the surgical procedure to connect the ~pinal rods to the spine, the surg~on must bend the pinal rods to conform, generally, to the curvature of ~he spine~ Quite often this requires the surgeon to bend the rod in three dimensions.
Since the rods must be connected to a pedicle screw or spinal hook, the ~olerances for the bend is exacting. The ~ending of the rods within the tight space available and to tolerance adds a significant amount of tLme to an already lengthy surgeryO
SUMMARY THE INVENTION
The spinal rod system and perpendicular rod connector of the invention provides for a first rod to be connected by two pedicle screws transverse to the spine across a vertebra. The perpendicular connector i~ then connected to the first rod anywhere along the rod. The longitudinal spinal rod is then connected to the perpendicular rod connector using common co~nectors~ The perpendicular 208896~
connector is slidable along the first rod. By using the perpendicular rod connector, the amount of bending and the tolerances required is reduced as the connector may be slid along the transverse rod to accommodate the longitudinal rod. Known pedicle screw~ may be used ~ith a slight bend placed in the transverse rod to accommodate the spinal column. Alternatively, the pedicle ~crews may be bent slightly such that a straight txansverse rod may be used.
By using the perpendicular rod csnnector and transverse rod arrangement, the amount of bending required on the longitudinal rod may be reduced to thereby shorten the entire procedure.
~ ccordingly, it is an object of the invention to provide for a novel system for connecting a spinal rod to a spinal column.
Another object of the invention i~ to provide for a novel perpendicular rod connector.
Another object of the invention is to provide for a primary fixation rod connected transversely to the ~pinal column.
Another object of the invention is to provide for a novel pedicle screw having a head angled relative to the screw shaft.
Other objects of th~ invention will become apparent upon a reading of the following description taken along with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective vie~ of the invention connected to a vertebra represented by a solid block and the spinal rods partially shown.
Fig. 2 is an elevational vie~ of the invention with the spinal rods shown in cross ~ection.
Fig. 3 is an elevational view of the perpendicular rod connector of the invention.
Fig. 4 is a perspective view of the perpendicular rod connector of Fig. 3.
208~9~1 Figs. 5 and 6 are seguential elevational views illustratin~ the method of connecting the perpendicular rod connector to a spinal rod (partially shown).
Fig. 7 is a view taken along line 7-7 of Fig. 6.
S Fig. 8 is an elevational view of th~ invention in use with an alternative embodiment of the pedicle screws~
The preferred embodiments herein disclosed are not intended to be exhaustive or to limit ~he invention to the precise forms disclosed. Rather, they are chosen and described to enable others skilled in the art to utilize their teachings.
The perpendicular rod ~y~tem 10 i~ illustrated connected to a block 8 for illustrative purposes only.
Block 8 is in place of an actual vertebra well known in the art. Perpendicular rod system 10 include ~ pair of pedicle screws 12 each including a threaded shaft ~4 for turning into the pedicle of the vertebra and a head 16.
~ead 1~ of each pedicle screw 12 forms a generally C-shaped seat. A rod 18 extends between each paLr of pedicle screws 12 and is connected thereto by a ~leeve 22 wedged into head 16 and maintained therein by a collar 24. Sleeve 22 and collar 24 engage in a ratchet ~anner ~uch that collar 24 will not slide off of sleeve 22. AS illustrated in figures 1 and 2, rod 20 includes a cen~ral bend to conform to the outer geometry of the vertebra just above the spinous process.
Perpendicular rod connec~or 24 includes a generally C-shaped body 26 defining a central opening 28. Opening 28 accommodates a spinal rod 30 with a sleeve 22 and collar 24 for securement of the rod to th2 connector 240 Body 26 includes a end wall 32. A pair of arcuate projections 34 extend from opposite side edges of ~aid end wall 3~ as illustrated best in Fig. 4. A small ledge 36 is formed adjacent e~ch projection 34 in alignment with the distal tip of each projection 34. The distancP between a distal 2088~61 tip of a projection 34 and its corresponding land 36 is slightly smaller than the distance between the distal tip and proximal portion 38 of the projection. Projections 34 are preferably integral with body 26 and may flex a small amount. A recess 40 is formed in eaGh ~ide 42 of body 26.
To use the perpendicular rod sy tem 10, a surgeon first installs a pair of pedicle screws 12 into the pedicle portions of the vertebra such that the heads 16 of the screws are in alignment. A rod 18 i8 connected between screws 12 preferably by use of a compression lee~e 20 and collar 22. Rod 12 may be bent ~lightly to accommodate the contour of the vertebra. Scre~s 12 and rod 18 constitute a primary fixation point for ~he ~ystem 10. A plurality of such primary fixation points will typically be required along the length of the spine. The ~urgeon ne~* connects a perpendicular rod connector 24 to rod 16 in the following manner. Griping the connector with an instrument engaged within recesses 40, the surgeon po~itions the connector transverse to rod 26 such that the rod is adjacent back wall 32 between projection 34 as ~hown in Fig. 5. The connector 24 is rotated in the direction of arrows 44 to force the distal tips of projections 34 over rod 26. The distance between the distal tips of projections 34 and their corresponding ledges 36 is ~lightly ~maller than the diameter of rod 26. Therefore, as th~ connector is rotated in the direction of arrows 44, projections 34 yield to allow the rod to fully seat ~ithin the projections. Each projection 34 is dimensioned so as to accommodate the rod in a relaxed state. Once connector 24 i8 connected to rod 18, it may be slid along ~he rod for proper lateral positioning with the spinal rod 30. ~od 30 is then connected to connector 24 preferably by a wedge fit between a sleeve 20 and the C-shaped body 26 of connector 24. In the preferred embodiment, ~he sleeve is maintained in position by a collar 22 as mentioned previously.
Typically, a second connector 24 will be attached to rod 18 for connection of a second ~pinal rod 30. Perpendicular 208g9~1 connector 24 therefor forms a secondary i~ation point in the system ld of the invention. The second~ry fixation point may be slid along rod 16 to accommodate lateral positiQning of the spinal rods.
An alternative embodiment of the fiystem is illustrated in Fig. 8. A common numbering ~cheme is used between Figs 1-7 and Fig. 8 wherein a common nu~ber indicates similar function and structure. System 10, illustrated in Fig. 8, includes a pair of pedicle screws 48 having a threaded shaft and a generally C-~haped head as with screw 12 of Figs. 1-7. Howeve.r, screw 48 is bent at its neck 52 such that the head and shaft are out of longitudinal alignment by approximately 20 degrees. Whe~ ~crew~ 48 are turned into the pedicle portion of a vertebra, the heads are positioned at an angle such that bar ~9 do~s no$ need to be bent to connect the two ~crews.-- Co~nector~ 24 may be connected to the rod in a manner de~cribed above.
It should be understood ~hat while the above invention has been described as using sleeve~ and collars to attach the rods to the screws and connector~, such should not be considered a limit~tion on the Lnvention of providing primary and secondary fixation poin~s. Indeed, many other viable alternatives well known in ~he Lndustry may find use in connecting the rods to the screws and connectors.
Further, it should be under~tood that the invention is not to be limited to the precise forms disclosed but may be modified in keeping with the appended claims.
By using the perpendicular rod csnnector and transverse rod arrangement, the amount of bending required on the longitudinal rod may be reduced to thereby shorten the entire procedure.
~ ccordingly, it is an object of the invention to provide for a novel system for connecting a spinal rod to a spinal column.
Another object of the invention i~ to provide for a novel perpendicular rod connector.
Another object of the invention is to provide for a primary fixation rod connected transversely to the ~pinal column.
Another object of the invention is to provide for a novel pedicle screw having a head angled relative to the screw shaft.
Other objects of th~ invention will become apparent upon a reading of the following description taken along with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective vie~ of the invention connected to a vertebra represented by a solid block and the spinal rods partially shown.
Fig. 2 is an elevational vie~ of the invention with the spinal rods shown in cross ~ection.
Fig. 3 is an elevational view of the perpendicular rod connector of the invention.
Fig. 4 is a perspective view of the perpendicular rod connector of Fig. 3.
208~9~1 Figs. 5 and 6 are seguential elevational views illustratin~ the method of connecting the perpendicular rod connector to a spinal rod (partially shown).
Fig. 7 is a view taken along line 7-7 of Fig. 6.
S Fig. 8 is an elevational view of th~ invention in use with an alternative embodiment of the pedicle screws~
The preferred embodiments herein disclosed are not intended to be exhaustive or to limit ~he invention to the precise forms disclosed. Rather, they are chosen and described to enable others skilled in the art to utilize their teachings.
The perpendicular rod ~y~tem 10 i~ illustrated connected to a block 8 for illustrative purposes only.
Block 8 is in place of an actual vertebra well known in the art. Perpendicular rod system 10 include ~ pair of pedicle screws 12 each including a threaded shaft ~4 for turning into the pedicle of the vertebra and a head 16.
~ead 1~ of each pedicle screw 12 forms a generally C-shaped seat. A rod 18 extends between each paLr of pedicle screws 12 and is connected thereto by a ~leeve 22 wedged into head 16 and maintained therein by a collar 24. Sleeve 22 and collar 24 engage in a ratchet ~anner ~uch that collar 24 will not slide off of sleeve 22. AS illustrated in figures 1 and 2, rod 20 includes a cen~ral bend to conform to the outer geometry of the vertebra just above the spinous process.
Perpendicular rod connec~or 24 includes a generally C-shaped body 26 defining a central opening 28. Opening 28 accommodates a spinal rod 30 with a sleeve 22 and collar 24 for securement of the rod to th2 connector 240 Body 26 includes a end wall 32. A pair of arcuate projections 34 extend from opposite side edges of ~aid end wall 3~ as illustrated best in Fig. 4. A small ledge 36 is formed adjacent e~ch projection 34 in alignment with the distal tip of each projection 34. The distancP between a distal 2088~61 tip of a projection 34 and its corresponding land 36 is slightly smaller than the distance between the distal tip and proximal portion 38 of the projection. Projections 34 are preferably integral with body 26 and may flex a small amount. A recess 40 is formed in eaGh ~ide 42 of body 26.
To use the perpendicular rod sy tem 10, a surgeon first installs a pair of pedicle screws 12 into the pedicle portions of the vertebra such that the heads 16 of the screws are in alignment. A rod 18 i8 connected between screws 12 preferably by use of a compression lee~e 20 and collar 22. Rod 12 may be bent ~lightly to accommodate the contour of the vertebra. Scre~s 12 and rod 18 constitute a primary fixation point for ~he ~ystem 10. A plurality of such primary fixation points will typically be required along the length of the spine. The ~urgeon ne~* connects a perpendicular rod connector 24 to rod 16 in the following manner. Griping the connector with an instrument engaged within recesses 40, the surgeon po~itions the connector transverse to rod 26 such that the rod is adjacent back wall 32 between projection 34 as ~hown in Fig. 5. The connector 24 is rotated in the direction of arrows 44 to force the distal tips of projections 34 over rod 26. The distance between the distal tips of projections 34 and their corresponding ledges 36 is ~lightly ~maller than the diameter of rod 26. Therefore, as th~ connector is rotated in the direction of arrows 44, projections 34 yield to allow the rod to fully seat ~ithin the projections. Each projection 34 is dimensioned so as to accommodate the rod in a relaxed state. Once connector 24 i8 connected to rod 18, it may be slid along ~he rod for proper lateral positioning with the spinal rod 30. ~od 30 is then connected to connector 24 preferably by a wedge fit between a sleeve 20 and the C-shaped body 26 of connector 24. In the preferred embodiment, ~he sleeve is maintained in position by a collar 22 as mentioned previously.
Typically, a second connector 24 will be attached to rod 18 for connection of a second ~pinal rod 30. Perpendicular 208g9~1 connector 24 therefor forms a secondary i~ation point in the system ld of the invention. The second~ry fixation point may be slid along rod 16 to accommodate lateral positiQning of the spinal rods.
An alternative embodiment of the fiystem is illustrated in Fig. 8. A common numbering ~cheme is used between Figs 1-7 and Fig. 8 wherein a common nu~ber indicates similar function and structure. System 10, illustrated in Fig. 8, includes a pair of pedicle screws 48 having a threaded shaft and a generally C-~haped head as with screw 12 of Figs. 1-7. Howeve.r, screw 48 is bent at its neck 52 such that the head and shaft are out of longitudinal alignment by approximately 20 degrees. Whe~ ~crew~ 48 are turned into the pedicle portion of a vertebra, the heads are positioned at an angle such that bar ~9 do~s no$ need to be bent to connect the two ~crews.-- Co~nector~ 24 may be connected to the rod in a manner de~cribed above.
It should be understood ~hat while the above invention has been described as using sleeve~ and collars to attach the rods to the screws and connector~, such should not be considered a limit~tion on the Lnvention of providing primary and secondary fixation poin~s. Indeed, many other viable alternatives well known in ~he Lndustry may find use in connecting the rods to the screws and connectors.
Further, it should be under~tood that the invention is not to be limited to the precise forms disclosed but may be modified in keeping with the appended claims.
Claims (10)
1. A system for functionally connecting a spinal rod to a vertebra, said system comprising a first fixation means connected to said vertebra, said first fixation means includes a bar carried transverse to a longitudinal dimension of a patients's spinal column, said system further including a secondary fixation means carried by said bar, said secondary fixation means being shiftable on said bar relative to aid first fixation means, and means for connecting said spinal rod to said secondary fixation means such that said spinal rod is transverse to said rod.
2. The system of Claim 1 wherein said first fixation means includes at least two screws for seating within each pedicle portion of aid vertebra, said bar extending between said screws.
3. The system of Claim 1 wherein said secondary fixation means comprises a connector having a body with an opening for accommodating said spinal fixation rod, a pair of hooks extend outwardly from a wall of said body, said hooks clampingly engage said rod such that said spinal fixation rod is transverse to said rod.
4. The system of Claim 3 wherein said connector includes a ledge adjacent each hook, said hooks extending from said wall such that said hooks face in opposite directions and are spaced from one another along said wall, said hooks yield to accept said rod.
5. A rod connector for connecting a spinal fixation rod to a support rod in a generally perpendicular orientation, said connector including a body having an opening therethrough for accommodating said spinal fixation rod, said rod connector further including hook means extending outwardly from a rear wall of said body for clamping engagement with said support rod between said hook means and said body, aid hook means being yieldable to pass said support rod between said body and a distal tip of said hook means, wherein said hook means defines a cavity for accommodating said support rod, said cavity being transverse to said opening.
6. The rod connector of Claim 5 wherein said hook means includes a pair of arcuate hooks facing in opposite directions and spaced along the rear wall of said body, each of said hooks including a distal tip spaced from said rear wall and a apex.
7. The rod connector of Claim 6 wherein the distance between the distal tips of said hooks and said rear wall is less than the distance between the apexes and the rear wall.
8. The rod connector of Claim 5 wherein said body includes recesses therein for accommodating mating projections from a clamp member.
9. A bone screw for use with spinal fixation devices, said screw including a threaded shaft and an integral head, said head defining a seat for accommodating a spinal rod, the improvement wherein said head and screw are angled relative to one. anther.
10. The bone screw of Claim 9 wherein said head and shaft are angled relative to one another in the range between 10 and 25 degrees.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84890492A | 1992-03-10 | 1992-03-10 | |
| US848,904 | 1992-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2088961A1 true CA2088961A1 (en) | 1993-09-11 |
Family
ID=25304590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002088961A Abandoned CA2088961A1 (en) | 1992-03-10 | 1993-02-05 | Perpendicular rod connector for spinal fixation device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5437671A (en) |
| EP (1) | EP0565149A2 (en) |
| JP (1) | JPH05344995A (en) |
| AU (1) | AU659912B2 (en) |
| CA (1) | CA2088961A1 (en) |
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-
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- 1993-02-04 AU AU32802/93A patent/AU659912B2/en not_active Ceased
- 1993-02-05 CA CA002088961A patent/CA2088961A1/en not_active Abandoned
- 1993-03-01 JP JP5039708A patent/JPH05344995A/en active Pending
- 1993-03-05 EP EP93200634A patent/EP0565149A2/en not_active Withdrawn
-
1994
- 1994-03-07 US US08/192,871 patent/US5437671A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0565149A3 (en) | 1994-03-02 |
| JPH05344995A (en) | 1993-12-27 |
| US5437671A (en) | 1995-08-01 |
| AU659912B2 (en) | 1995-06-01 |
| EP0565149A2 (en) | 1993-10-13 |
| AU3280293A (en) | 1993-09-16 |
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| Date | Code | Title | Description |
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| FZDE | Discontinued |