CA2163243A1 - Stabilising arrangement, in particular for stabilising the spinal column - Google Patents
Stabilising arrangement, in particular for stabilising the spinal columnInfo
- Publication number
- CA2163243A1 CA2163243A1 CA002163243A CA2163243A CA2163243A1 CA 2163243 A1 CA2163243 A1 CA 2163243A1 CA 002163243 A CA002163243 A CA 002163243A CA 2163243 A CA2163243 A CA 2163243A CA 2163243 A1 CA2163243 A1 CA 2163243A1
- Authority
- CA
- Canada
- Prior art keywords
- stabilizer
- web portion
- plate
- resilient member
- stabilizer device
- 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
- 230000003019 stabilising effect Effects 0.000 title 2
- 239000003381 stabilizer Substances 0.000 claims abstract description 53
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 25
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 230000001154 acute effect Effects 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000004886 head movement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/32—Locking by means of a pawl or pawl-like tongue
-
- 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
- A61B17/7059—Cortical plates
-
- 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
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
Abstract
A stabilizer device, in particular for stabilizing the spinal column, comprises a stabilizer plate (1) having a first end (12) and an opposite second end (13) and at least one hole (14) at each end for receiving bone screws having a threaded shaft (21) for screwing in when rotating in the first direction and unscrewing when rotating in a second direction. The bone screws are secured against unintentional rotation in the second rotating direction by means of a locking device (15). The locking device (15) comprises a resilient member (30, 31, 32) engaging the bone screw to be received, the resilient device being formed as a portion of the stabilizer plate (1) and deflectable from the locking position thereof in a recess (35) of the stabilizer plate (1) during rotation in the first direction.
Description
~32~3 Stabilizer Device, in particular for stabilizing the spinal column ______________________________________________________________ The invention relates to a stabilizer device, in particular for stabilizing the spinal column, according to the preamble of claim 1.
Stabilizer devices are used for connecting two vertebrae of the spinal column in particular in the cervical region. Conventional stabilizer devices consist of a stabilizer plate which is fastened by means of at least two bone screws which are screwed into the respective vertebra to be connected.
Especially in the region of the cervical vertebra the head movement tends to loosen or rotate or even knock out the screws.
Thus a stable connection of the vertebrae is no longer guaranteed.
It is the object of the invention to provide a stabilizer device which secures the screws against releasing rotation.
The subject is achieved by a stabilizer device according to claim 1.
It is the advantage of the stabilizer device that the lock of the screws against unintentional unscrewing is designed such that each screw can easily be screwed into the material and no externally mounted device for locking the bone screw against unintentional unscrewing is required. Thus conventional srew securing techniques using for example resilient toothlock washers, cover flaps or the like which are rather inconvenient to handle during an operation at the spinal column can be omitted.
Stabilizer devices are used for connecting two vertebrae of the spinal column in particular in the cervical region. Conventional stabilizer devices consist of a stabilizer plate which is fastened by means of at least two bone screws which are screwed into the respective vertebra to be connected.
Especially in the region of the cervical vertebra the head movement tends to loosen or rotate or even knock out the screws.
Thus a stable connection of the vertebrae is no longer guaranteed.
It is the object of the invention to provide a stabilizer device which secures the screws against releasing rotation.
The subject is achieved by a stabilizer device according to claim 1.
It is the advantage of the stabilizer device that the lock of the screws against unintentional unscrewing is designed such that each screw can easily be screwed into the material and no externally mounted device for locking the bone screw against unintentional unscrewing is required. Thus conventional srew securing techniques using for example resilient toothlock washers, cover flaps or the like which are rather inconvenient to handle during an operation at the spinal column can be omitted.
2~632 Advantageous developments are defined in the subclaims.
In the following an embodiment is described with reference to the figures.
In the figures:
Fig. 1 shows a top view of the stabilizer plate;
Fig. 2 is an enlarged sectional view along line A - A of Fig. 1;
Fig. 3 is an enlarged representation of the portion B of Fig. 1;
Fig. 4 is a side view of a bone screw;
Fig. 5 is a top view of the head of the bone screw of Fig. 4;
Fig. 6 is a sectional view showing a state of a bone screw when screwed in but before being finally secured;
Fig. 7 is a sectional view showing the bone screw in the final screwed-in state.
As shown in Fig. 1 the stabilizer device comprises a substantially rectangular stabilizer plate 1. In the further description the center line of the plate extending in longitudinal direction of the rectangle is referred to as D and the center line extending transversally thereto in cross-section of the rectangle is referred to as C.
The stabilizer plate 1 is shaped to have rounded corners 10 and longitudinal sides 11 which are curved symmetrically towards the center line D.
The plate comprises a first end 12 and an opposite second end 13 each having two bores 14 for receiving bone screws. The bores 14 are arranged to be in pairs symmetric with respect to the center line C and to the center line D, respectively, of the plate.
h ~
As shown in Fig. 3 each bore 14 is an elongate hole having the larger diameter thereof extending parallel to the center line D.
The elongate hole is superimposed by a circular hole having a diameter which is equal to the smaller diameter of the elongate hole, whereby the center M of the circular hole is located on the longitudinal axis of the elongate hole and offset from the center of the elongate hole in the direction towards the center line C. The circular hole is provided with a countersink 16 for fittingly receive the screw head of a bone screw 2 which will be described in detail further below.
As shown in Fig. 1 the stabilizer plate 1 has a lock member 15 for locking the bone screw 2, the lock member being provided at the end of each bore 14 facing the center line C of the stabilizer plate 1.
The lock member 15 is formed as a resilient member being a part of the stabilizer plate 1 and lying in the plane of the plate.
It is produced by cutting out the stabilizer plate and can be deflected in direction of the plane of the plate in a recess 35 produced in the stabilizer plate 1 by this cut-out operation.
As shown in Fig. 3 the lock member comprises a curved web portion 30 having one end passing over into the stabilizer plate 1. The other end thereof is joined, at the side facing the center of curvature, to a straight web portion 31 including an acute angle with the curved web portion and having a free end bent towards the curved web portion 30. The curvature of the curved web portion 30 is a left hand curvature when seen from the connection to the stabilizer plate. The tip 17 of the lock member 15 formed by the curved web portion 30 and the straight web portion 31 has a distance from the center M of the circular hole which is smaller than the radius of the circular hole, i.e.
the tip 17 slightly projects into the circular hole which can also be seen in the sectional view of Fig. 2.
~ ~ B3% ~3 The straight web portion 31 extends in radial direction of the circular hole and includes an angle of about 60 with the curved web portion in the region of the tip 17. The lock member 15 is resilient and can be deflected within the recess 35 of the stabilizer plate 1 from the above-described unstressed position (shown in full lines in Fig. 3) in direction of the center of curvature of the curved web portion 30 (broken line in Fig. 3).
The side of the curved web portion opposite to the center of curvature is adjacent to the plate body 60. In the deflected position shown in broken lines the distance of the tip 17 of the lock member from the center M of the circular hole is larger than or equal to the outer radius of the countersink 16 surrounding the circular hole.
The stabilizer device further comprises bone screws 2 for mounting the stabilizer plate 1, as shown in Fig. 4. The bone screw 2 comprises a screw head 20 and a threaded shaft 21. At one side thereof the screw head 20 is connected with the threaded shaft and comprises an edge which is substantially shaped as a spherical segment. The center of this segment is on the side opposite to the threaded shaft and on the longitudinal axis of the screw. The diameter of the screw head is equal to or slightly smaller than the diameter of the countersink 16 of the circular hole. The spherically curved edge of the screw head 20 is provided with a toothing 23 which may be engaged by the lock member 15 for locking the screw.
As shown in Fig. 5 the toothing 23 is formed in such a way that each tooth is defined by a first tooth flank 51 extending in radial direction of the screw head and a second tooth flank 52 including an acute angle with this radial direction. The arrangement of the second tooth flank is selected to precede the first tooth flank in the first clockwise rotating direction.
When screwed in the screw head 20 is placed within the countersink 16 of the circular hole and the straight web portion 31 of the lock member 15 abuts the first tooth flank 51 of the toothing 23 for providing a lock.
5 2~,~32'~
At the side of the screw head 20 opposite to the threaded shaft 21 a hexagon hole 55 receiving a wrench for rotating the screw 2 is provided in the center of the screw head 20.
The stabilizer plate 1 and the bone screw 2 are made out of a physically friendly material, preferably of titanium.
The operation of the locking device according to the Figures 1 to 5 is as follows: When screwing in the screw in the first clockwise rotating direction each of the second tooth flanks 52 of the screw head 20 slide along the curved web portion 30 of the lock member 15 as soon as the screw head 20 arrives in the region of the countersink 16. Thereby the lock member is deflected by the tooth flanks 52 sliding therealong in such a manner that the straight web portion 31 is pushed out from the lock position thereof by the first tooth flank 51. The tip 17 of the lock member then has a respective distance from the center M
of the circular hole which is larger than the radius of the circular hole. After the passage of each second tooth flank 52 the resilient lock member 15 snaps into the above-described lock position thereof.
When attempting to rotate the screw in a second rotating direction opposite to the first rotating direction for unscrewing the screw the first tooth flank 51 of the toothing is pressed against the straight web portion 31 of the lock member and the tip 17 of the lock member is clamled in the toothing.
Thus, unscrewing the screw is impossible without using additional auxiliary equipment for deflecting the lock member into the position shown in broken lines.
The mounting of the stabilizer plate 1 will now be described with reference to the Figures 6 and 7.
6 2~ S32 ~3 Figure 6 is a sectional view of a portion of the stabilizer plate 1 comprising the hole 14 and the screw head in a position before the final fixation. The screw is positioned at about the longitudinal center of the elongate hole. Thereupon the threaded shaft 21 is screwed in until the screw head 20 pushes against an upper edge 18 of the edge of the elongate hole which is not countersunk.
When further rotating the screw in the first rotating direction the screw head 20 is pushed away from this upper edge 18 and pulled into the fitting countersink 16 of the circular hole superimposing the elongate hole. This centers the head 20 of the bone screw 2 within the circular hole whereby the respective vertebrae which are bolted to the first or second end, respectively, of the stabilizer plate are pressed onto each other. Fig. 7 is a sectional view of the stabilizer plate 1 and of the bone screw 2 when completely screwed in.
The transverse diameter of the elongate hole and therefore the diameter of the hole belonging to the center of the countersink 16 is selected in relation to the shaft of the screw 2 so that, as shown in Fig. 6, the screw 2 may be inserted in an inclined position which includes an angle of up to 15 from the axis of the hole. Since as apparent from Fig. 4 or Fig. 7 the tooth flanks extend over almost the entire height of the head in axial direction the lock obtained in the above-described manner also occurs if the screw is inserted in inclined position.
In the following an embodiment is described with reference to the figures.
In the figures:
Fig. 1 shows a top view of the stabilizer plate;
Fig. 2 is an enlarged sectional view along line A - A of Fig. 1;
Fig. 3 is an enlarged representation of the portion B of Fig. 1;
Fig. 4 is a side view of a bone screw;
Fig. 5 is a top view of the head of the bone screw of Fig. 4;
Fig. 6 is a sectional view showing a state of a bone screw when screwed in but before being finally secured;
Fig. 7 is a sectional view showing the bone screw in the final screwed-in state.
As shown in Fig. 1 the stabilizer device comprises a substantially rectangular stabilizer plate 1. In the further description the center line of the plate extending in longitudinal direction of the rectangle is referred to as D and the center line extending transversally thereto in cross-section of the rectangle is referred to as C.
The stabilizer plate 1 is shaped to have rounded corners 10 and longitudinal sides 11 which are curved symmetrically towards the center line D.
The plate comprises a first end 12 and an opposite second end 13 each having two bores 14 for receiving bone screws. The bores 14 are arranged to be in pairs symmetric with respect to the center line C and to the center line D, respectively, of the plate.
h ~
As shown in Fig. 3 each bore 14 is an elongate hole having the larger diameter thereof extending parallel to the center line D.
The elongate hole is superimposed by a circular hole having a diameter which is equal to the smaller diameter of the elongate hole, whereby the center M of the circular hole is located on the longitudinal axis of the elongate hole and offset from the center of the elongate hole in the direction towards the center line C. The circular hole is provided with a countersink 16 for fittingly receive the screw head of a bone screw 2 which will be described in detail further below.
As shown in Fig. 1 the stabilizer plate 1 has a lock member 15 for locking the bone screw 2, the lock member being provided at the end of each bore 14 facing the center line C of the stabilizer plate 1.
The lock member 15 is formed as a resilient member being a part of the stabilizer plate 1 and lying in the plane of the plate.
It is produced by cutting out the stabilizer plate and can be deflected in direction of the plane of the plate in a recess 35 produced in the stabilizer plate 1 by this cut-out operation.
As shown in Fig. 3 the lock member comprises a curved web portion 30 having one end passing over into the stabilizer plate 1. The other end thereof is joined, at the side facing the center of curvature, to a straight web portion 31 including an acute angle with the curved web portion and having a free end bent towards the curved web portion 30. The curvature of the curved web portion 30 is a left hand curvature when seen from the connection to the stabilizer plate. The tip 17 of the lock member 15 formed by the curved web portion 30 and the straight web portion 31 has a distance from the center M of the circular hole which is smaller than the radius of the circular hole, i.e.
the tip 17 slightly projects into the circular hole which can also be seen in the sectional view of Fig. 2.
~ ~ B3% ~3 The straight web portion 31 extends in radial direction of the circular hole and includes an angle of about 60 with the curved web portion in the region of the tip 17. The lock member 15 is resilient and can be deflected within the recess 35 of the stabilizer plate 1 from the above-described unstressed position (shown in full lines in Fig. 3) in direction of the center of curvature of the curved web portion 30 (broken line in Fig. 3).
The side of the curved web portion opposite to the center of curvature is adjacent to the plate body 60. In the deflected position shown in broken lines the distance of the tip 17 of the lock member from the center M of the circular hole is larger than or equal to the outer radius of the countersink 16 surrounding the circular hole.
The stabilizer device further comprises bone screws 2 for mounting the stabilizer plate 1, as shown in Fig. 4. The bone screw 2 comprises a screw head 20 and a threaded shaft 21. At one side thereof the screw head 20 is connected with the threaded shaft and comprises an edge which is substantially shaped as a spherical segment. The center of this segment is on the side opposite to the threaded shaft and on the longitudinal axis of the screw. The diameter of the screw head is equal to or slightly smaller than the diameter of the countersink 16 of the circular hole. The spherically curved edge of the screw head 20 is provided with a toothing 23 which may be engaged by the lock member 15 for locking the screw.
As shown in Fig. 5 the toothing 23 is formed in such a way that each tooth is defined by a first tooth flank 51 extending in radial direction of the screw head and a second tooth flank 52 including an acute angle with this radial direction. The arrangement of the second tooth flank is selected to precede the first tooth flank in the first clockwise rotating direction.
When screwed in the screw head 20 is placed within the countersink 16 of the circular hole and the straight web portion 31 of the lock member 15 abuts the first tooth flank 51 of the toothing 23 for providing a lock.
5 2~,~32'~
At the side of the screw head 20 opposite to the threaded shaft 21 a hexagon hole 55 receiving a wrench for rotating the screw 2 is provided in the center of the screw head 20.
The stabilizer plate 1 and the bone screw 2 are made out of a physically friendly material, preferably of titanium.
The operation of the locking device according to the Figures 1 to 5 is as follows: When screwing in the screw in the first clockwise rotating direction each of the second tooth flanks 52 of the screw head 20 slide along the curved web portion 30 of the lock member 15 as soon as the screw head 20 arrives in the region of the countersink 16. Thereby the lock member is deflected by the tooth flanks 52 sliding therealong in such a manner that the straight web portion 31 is pushed out from the lock position thereof by the first tooth flank 51. The tip 17 of the lock member then has a respective distance from the center M
of the circular hole which is larger than the radius of the circular hole. After the passage of each second tooth flank 52 the resilient lock member 15 snaps into the above-described lock position thereof.
When attempting to rotate the screw in a second rotating direction opposite to the first rotating direction for unscrewing the screw the first tooth flank 51 of the toothing is pressed against the straight web portion 31 of the lock member and the tip 17 of the lock member is clamled in the toothing.
Thus, unscrewing the screw is impossible without using additional auxiliary equipment for deflecting the lock member into the position shown in broken lines.
The mounting of the stabilizer plate 1 will now be described with reference to the Figures 6 and 7.
6 2~ S32 ~3 Figure 6 is a sectional view of a portion of the stabilizer plate 1 comprising the hole 14 and the screw head in a position before the final fixation. The screw is positioned at about the longitudinal center of the elongate hole. Thereupon the threaded shaft 21 is screwed in until the screw head 20 pushes against an upper edge 18 of the edge of the elongate hole which is not countersunk.
When further rotating the screw in the first rotating direction the screw head 20 is pushed away from this upper edge 18 and pulled into the fitting countersink 16 of the circular hole superimposing the elongate hole. This centers the head 20 of the bone screw 2 within the circular hole whereby the respective vertebrae which are bolted to the first or second end, respectively, of the stabilizer plate are pressed onto each other. Fig. 7 is a sectional view of the stabilizer plate 1 and of the bone screw 2 when completely screwed in.
The transverse diameter of the elongate hole and therefore the diameter of the hole belonging to the center of the countersink 16 is selected in relation to the shaft of the screw 2 so that, as shown in Fig. 6, the screw 2 may be inserted in an inclined position which includes an angle of up to 15 from the axis of the hole. Since as apparent from Fig. 4 or Fig. 7 the tooth flanks extend over almost the entire height of the head in axial direction the lock obtained in the above-described manner also occurs if the screw is inserted in inclined position.
Claims (15)
1. Stabilizer device, in particular for stabilizing the spinal column, comprising a stabilizer plate (1) having a first end (12) and a second end (13) opposite to the first end and at least one respective hole (14) at each end for receiving bone screws (2), the bone screws having a threaded shaft (21) for screwing in a first rotating direction and unscrewing a second rotating direction, characterized in that a device (15, 23) for locking the bone screws against unintentional rotation in the second rotating direction is provided.
2. Stabilizer device according to claim 1, characterized in that the locking device (15) comprises a resilient member (30, 31, 32) engaging the bone screw to be received.
3. Stabilizer device according to claim 2, characterized in that the bone screw (2) comprises a screw head (20) being adjacent to the threaded shaft (21) and comprising, at the periphery thereof, a toothing (23) engaging the resilient member for providing the lock.
4. Stabilizer device according to claim 3, characterized in that the toothing (23) is formed in such a manner that a first tooth flank (51) points in radial direction of the screw head (20) and a second tooth flank (52) is formed including an acute angle with this radial direction, and that the second tooth flank precedes the first tooth flank in the sense of the first rotating direction.
5. Stabilizer device according to claim 3 or 4, characterized in that the hole (14) is formed as an elongate hole having a longitudinal axis pointing at the two ends (12, 13) of the plate, the elongate hole being superimposed by a circular hole having the same diameter and a countersink (16) for fittingly receiving the screw head (20), whereby the center (M) of the circular hole is located on the longitudinal axis of the elongate hole and offset from the center of the elongate hole towards the opposite end of the plate.
6. Stabilizer device according to any of the claims 2 to 5, characterized in that the resilient member (30, 31, 32) is formed as a portion of the stabilizer plate (1) lying in the plane of the plate.
7. Stabilizer device according to claim 6, characterized in that the resilient member has a curved web portion (30) connected with the stabilizer plate (1) and a straight web portion (31) joined thereto on the side of the center of curvature and including an acute angle with the curved web portion, the straight web portion having a free end which is bent towards the curved web portion, the curvature of the curved web portion (30) being a left-hand curvature when seen from the point of connection with the stabilizer plate.
8. Stabilizer device according to claim 6 or 7, characterized in that the resilient member can be deflected in a recess (35) of the stabilizer plate (1) in direction of the center of curvature of the curved web portion (30).
9. Stabilizer device according to claim 8, characterized in that the resilient member is formed so that a tip (17) formed between the curved web portion (30) and the straight web portion has, in unstressed state of the resilient member, a distance from the center of the circular hole which is smaller than the radius of the circular hole.
10. Stabilizer device according to claim 8 or 9, characterized in that the resilient member is formed so that the tip (17) thereof is, in a deflected position of the resilient member, in a distance from the center of the circular hole which is larger than or equal to the outer radius of the countersink (16) surrounding the circular hole.
11. Stabilizer device according to any of the claims 3 to 10, characterized in that the head (20) of the bone screw (2) comprises an edge having the shape of a substantially spherical segment, whereby the center of the spherical segment is on the side opposite to the threaded shaft (21).
12. Stabilizer plate according to claim 11, characterized in that the countersink (16) of the circular hole is adapted to match the shape of the screw head (20).
13. Stabilizer device according to any of the claims 1 to 12, characterized in that two holes (14) are provided at each of the first (12) and second (13) end of the stabilizer plate (1).
14. Stabilizer device according to any of the claims 1 to 13, characterized in that the stabilizer plate (1) together with the lock device (15) and the bone screw (2) are made of a physically friendly metal, preferably titanium.
15. Stabilizer device according to any of the claims 3 to 14, characterized in that the bone screw (2) has a recess (55) for inserting a wrench for rotating the screw, the recess being provided at the end of the screw head (20) opposite to the threaded shaft.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4409833A DE4409833A1 (en) | 1994-03-22 | 1994-03-22 | Stabilizing device, in particular for stabilizing the spine |
| DEP4409833.2 | 1994-03-22 | ||
| PCT/EP1995/000745 WO1995025474A1 (en) | 1994-03-22 | 1995-03-01 | Stabilising arrangement, in particular for stabilising the spinal column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2163243A1 true CA2163243A1 (en) | 1995-09-28 |
Family
ID=6513500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002163243A Abandoned CA2163243A1 (en) | 1994-03-22 | 1995-03-01 | Stabilising arrangement, in particular for stabilising the spinal column |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0699057B1 (en) |
| JP (1) | JPH08511189A (en) |
| KR (1) | KR960702282A (en) |
| CN (1) | CN1124447A (en) |
| AT (1) | ATE193431T1 (en) |
| CA (1) | CA2163243A1 (en) |
| DE (2) | DE4409833A1 (en) |
| WO (1) | WO1995025474A1 (en) |
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| US7655028B2 (en) | 2003-09-30 | 2010-02-02 | X-Spine Systems, Inc. | Spinal fusion system and method for fusing spinal bones |
| US7963982B2 (en) | 2007-07-16 | 2011-06-21 | X-Spine Systems, Inc. | Implant plate screw locking system and screw having a locking member |
| US8062367B2 (en) | 2003-09-30 | 2011-11-22 | X-Spine Systems, Inc. | Screw locking mechanism and method |
| US8282682B2 (en) | 2003-09-30 | 2012-10-09 | X-Spine Systems, Inc. | Fusion system and method for fusing spinal bones |
| US8372152B2 (en) | 2003-09-30 | 2013-02-12 | X-Spine Systems, Inc. | Spinal fusion system utilizing an implant plate having at least one integral lock and ratchet lock |
| US8821553B2 (en) | 2003-09-30 | 2014-09-02 | X-Spine Systems, Inc. | Spinal fusion system utilizing an implant plate having at least one integral lock |
| US9078706B2 (en) | 2003-09-30 | 2015-07-14 | X-Spine Systems, Inc. | Intervertebral fusion device utilizing multiple mobile uniaxial and bidirectional screw interface plates |
| US9987052B2 (en) | 2015-02-24 | 2018-06-05 | X-Spine Systems, Inc. | Modular interspinous fixation system with threaded component |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29614425U1 (en) * | 1996-08-22 | 1997-12-18 | Link Waldemar Gmbh Co | Heel bone plate |
| US7306628B2 (en) | 2002-10-29 | 2007-12-11 | St. Francis Medical Technologies | Interspinous process apparatus and method with a selectably expandable spacer |
| US6068630A (en) | 1997-01-02 | 2000-05-30 | St. Francis Medical Technologies, Inc. | Spine distraction implant |
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1994
- 1994-03-22 DE DE4409833A patent/DE4409833A1/en not_active Withdrawn
-
1995
- 1995-03-01 WO PCT/EP1995/000745 patent/WO1995025474A1/en active IP Right Grant
- 1995-03-01 DE DE59508414T patent/DE59508414D1/en not_active Expired - Lifetime
- 1995-03-01 CN CN95190204A patent/CN1124447A/en active Pending
- 1995-03-01 AT AT95912177T patent/ATE193431T1/en not_active IP Right Cessation
- 1995-03-01 EP EP95912177A patent/EP0699057B1/en not_active Expired - Lifetime
- 1995-03-01 CA CA002163243A patent/CA2163243A1/en not_active Abandoned
- 1995-03-01 JP JP7524327A patent/JPH08511189A/en active Pending
- 1995-11-21 KR KR1019950705180A patent/KR960702282A/en not_active Application Discontinuation
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| US8062367B2 (en) | 2003-09-30 | 2011-11-22 | X-Spine Systems, Inc. | Screw locking mechanism and method |
| US8282682B2 (en) | 2003-09-30 | 2012-10-09 | X-Spine Systems, Inc. | Fusion system and method for fusing spinal bones |
| US8372152B2 (en) | 2003-09-30 | 2013-02-12 | X-Spine Systems, Inc. | Spinal fusion system utilizing an implant plate having at least one integral lock and ratchet lock |
| US8734493B2 (en) | 2003-09-30 | 2014-05-27 | X-Spine Systems, Inc. | Screw locking mechanism and method |
| US8795370B2 (en) | 2003-09-30 | 2014-08-05 | X-Spine Systems, Inc. | Fusion system and method for fusing spinal bones |
| US8821553B2 (en) | 2003-09-30 | 2014-09-02 | X-Spine Systems, Inc. | Spinal fusion system utilizing an implant plate having at least one integral lock |
| US9078706B2 (en) | 2003-09-30 | 2015-07-14 | X-Spine Systems, Inc. | Intervertebral fusion device utilizing multiple mobile uniaxial and bidirectional screw interface plates |
| US7963982B2 (en) | 2007-07-16 | 2011-06-21 | X-Spine Systems, Inc. | Implant plate screw locking system and screw having a locking member |
| US8728130B2 (en) | 2007-07-16 | 2014-05-20 | X-Spine Systems, Inc. | Implant plate screw locking system and screw having a locking member |
| US9987052B2 (en) | 2015-02-24 | 2018-06-05 | X-Spine Systems, Inc. | Modular interspinous fixation system with threaded component |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0699057B1 (en) | 2000-05-31 |
| DE59508414D1 (en) | 2000-07-06 |
| CN1124447A (en) | 1996-06-12 |
| WO1995025474A1 (en) | 1995-09-28 |
| ATE193431T1 (en) | 2000-06-15 |
| DE4409833A1 (en) | 1995-10-05 |
| JPH08511189A (en) | 1996-11-26 |
| KR960702282A (en) | 1996-04-27 |
| EP0699057A1 (en) | 1996-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |