CA2485157C - Pedicle screw with a closure device for the fixing of elastic rod elements - Google Patents
Pedicle screw with a closure device for the fixing of elastic rod elements Download PDFInfo
- Publication number
- CA2485157C CA2485157C CA2485157A CA2485157A CA2485157C CA 2485157 C CA2485157 C CA 2485157C CA 2485157 A CA2485157 A CA 2485157A CA 2485157 A CA2485157 A CA 2485157A CA 2485157 C CA2485157 C CA 2485157C
- Authority
- CA
- Canada
- Prior art keywords
- ridges
- closure cap
- grooves
- elastic rod
- seat
- 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.)
- Expired - Fee Related
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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
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
- A61B17/7005—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit in the screw or hook heads
-
- 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
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- 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
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/7031—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other made wholly or partly of flexible material
Abstract
A pedicle screw assembly comprising a closure device having a seat element with a U-shaped seat recess, the U-shaped recess including grooves or ridges, an elastic rod element having grooves or ridges, the grooves or ridges of the elastic rod element extending in a transverse direction with respect to a lengthwise direction of the elastic rod element, an elastic closure cap having grooves or ridges, the elastic closure cap being inserted internally of the U--shaped seat recess for quick closure of the seat element and thereby forming a substantially circumferential enclosure between the U-shaped seat recess and the closure cap to receive the elastic rod element placeable within the substantially circumferential enclosure between the U-shaped seat recess and the closure cap for stabilizing a vertebral column and to hold the surrounded and engaged elastic rod element with the closure device, holder elements of the elastic closure cap securing the closure cap in the seat element, the grooves or ridges of the U-shaped seat recess of the seat element and the grooves or ridges of the elastic closure cap each corresponding to one another, and the respective grooves or ridges engaging one another in a form-locking way at places of contact such that the elastic rod element carries out the function of a cross-brace and forces which are active in a lengthwise direction of the elastic rod element along a longitudinal axis of the elastic rod element are thereby transmittable to the closure device, the respective grooves or ridges of the U--shaped seat recess of the seat element and the elastic closure cap being aligned transversely to the lengthwise direction of the elastic rod element, and the grooves or ridges in the seat recess being extended until ends of two arms formed by the seat element and the respective grooves or ridges in the seat recess fitting into the grooves or ridges in the elastic rod element.
Description
Pedicle Screw with a Closure Device for the Fixing of Elastic Rod Elements This invention relates to orthopedic implants, and more specifically to a pedicle screw with a closure device, comprising a seat element with a U-s shaped seat recess, into which recess a closure cap is insertable for quick closure of the seat element of the pedicle screw, to receive an elastic rod element, placeable therein, which serves to stabilize a vertebral column, and to hold it with the closure device via a holder. It serves for quick, secure and simple fastening and connection during spinal surgery.
In the state of the art there is a wide selection of pedicle screws with closure devices having, as a rule, a receiving part with a U-shaped recess for receiving a rod, which recess has between its free arms an internal threading for accepting a screw for fixing the rod.
U.S. Patent No. 5,496,321 describes a pedicle screw with an 15 anchoring means. This product has the disadvantage, however, that the anchoring means has to be inserted in the screw head in the direction of the rod, which, in the case of small radii of curvature of the rod, can lead to considerable difficulties under operating conditions.
U.S. published patent application No. 0030004511 describes a ao pedicle screw system, whose receiving arms for a rod are connected with a hinge. After receiving the rod, the receiving arms are provided with a closure cap or a closure yoke, which press the arms together and hold the rod firmly.
To put on the closure cap or yoke, the arms of the head of the pedicle screw have to be pressed together, and at the same time the closure piece has to be 25 pushed in the rod direction or turned, or respectively the closure yoke has to be hung, requiring not only considerable skill on the part of the operator, but, depending upon the embodiment, also a special instrument.
The present invention therefore has the object of providing a pedicle screw with a closure device which ensures the transmission of forces from the so rod to the screw on the open side, and prevents the rod from being able to slip out backwards, and permits a secure and quick closure of the seat of the rod in the pedicle screw in order to firmly hold this rod therein. Furthermore, the closure device must also be removable again.
It has been found that these objects can be achieved through a s closure device which carries out the function of a cross-brace that engages on the rod in a provided grooved structure and which transmits forces thus absorbed in lengthwise direction of the rod to the flanks, also provided with grooves, of the open seat of the pedicle screws. To solve the technical problem, the closure device must further comprise an engagement means (e.g.
io two hooks). For this purpose, the closure cap must be elastically maneuverable, so that it itself locks into place (hooks in) upon insertion in the seat of the pedicle screw. Furthermore, for a quick and secure removal again, respective means must be available, where a corresponding instrument, preferably a universal instrument, can engage.
~s The subject matter of the present invention is thus a pedicle screw with a closure device, comprising a seat element with a U-shaped seat recess, into which recess a closure cap is insertable for quick closure of the seat element of the pedicle screw, to receive an elastic rod element, placeable therein, which serves to stabilize a vertebral column, and to hold it with the 2o closure device via a holder, wherein the rod element, the U-shaped seat recess of the seat element and the closure cap each have a ridged or grooved surface structure, corresponding to one another, and which surface structures come into engagement with one another in a form-locking way at the respective places of contact such that the closure cap carries out the function of a cross-es brace and the forces which are active in lengthwise direction of the rod element are thereby transmittable to the pedicle screw.
The pedicle screw with the closure device according to the invention is useful for quick and secure closure and connection of an elastic rod element to a pedicle screw with a simultaneous transmission of forces from the rear rod 3o side to the flanks of the pedicle screw. The closure cap provided for the closure device is advantageously made of a biocompatible synthetic material, preferably of polyurethane of medical grade quality which can be processed through injection molding. To insert the closure cap in the matching holding element, the hooks provided on the closure cap automatically lock into place in the matching depressions in the arms of the closure device at the head of the pedicle screw, as soon as they are in the correct position. Further provided are s means making possible a simple removal of these closure devices, should this be necessary during the ongoing, or a later, operation. A kinematic reversal of hooks and depressions is likewise possible and should be covered by the definition of the present invention, although the geometry of the depressions must be adapted, which does not present an insolvable problem for one skilled io in the art.
At least one, preferably two, engagement projections provided in the seat recess serve to prefix the rod element in the seat element before the closure cap is inserted, it being possible for the rod element to be held partially as well as completely in the seat element in a form-locking way such that, for ,s position correction, a simple removal and reinsertion of the rod element is possible during an operation. For this purpose both the rod element and the seat recess have a grooved/ridged structure, fitting into one another, in transverse direction with respect to the rod element. A co-operation of the engagement projection or projections with the mentioned form-locking structure permits a prefixing in lengthwise and crosswise direction with respect to the rod element. For this purpose, the grooved structure in the interior of the seat recess is preferably extended until the ends of its arms. The mentioned engagement projections may be positioned such that, in engaged state, they exercise a slight pressure on the rod element, or penetrate into the rod in a 2s form-locking way, it also being possible to provide for a slight offsetting. In closed state, the closure device with the mentioned features also enables absorption of torsional forces exerted by the rod element.
The invention is illustrated in the attached figures with reference to examples, different features being explained with reference to their purpose so and their function.
Figure 1 shows a typical pedicle screw with seat element and closure cap according to the invention;
In the state of the art there is a wide selection of pedicle screws with closure devices having, as a rule, a receiving part with a U-shaped recess for receiving a rod, which recess has between its free arms an internal threading for accepting a screw for fixing the rod.
U.S. Patent No. 5,496,321 describes a pedicle screw with an 15 anchoring means. This product has the disadvantage, however, that the anchoring means has to be inserted in the screw head in the direction of the rod, which, in the case of small radii of curvature of the rod, can lead to considerable difficulties under operating conditions.
U.S. published patent application No. 0030004511 describes a ao pedicle screw system, whose receiving arms for a rod are connected with a hinge. After receiving the rod, the receiving arms are provided with a closure cap or a closure yoke, which press the arms together and hold the rod firmly.
To put on the closure cap or yoke, the arms of the head of the pedicle screw have to be pressed together, and at the same time the closure piece has to be 25 pushed in the rod direction or turned, or respectively the closure yoke has to be hung, requiring not only considerable skill on the part of the operator, but, depending upon the embodiment, also a special instrument.
The present invention therefore has the object of providing a pedicle screw with a closure device which ensures the transmission of forces from the so rod to the screw on the open side, and prevents the rod from being able to slip out backwards, and permits a secure and quick closure of the seat of the rod in the pedicle screw in order to firmly hold this rod therein. Furthermore, the closure device must also be removable again.
It has been found that these objects can be achieved through a s closure device which carries out the function of a cross-brace that engages on the rod in a provided grooved structure and which transmits forces thus absorbed in lengthwise direction of the rod to the flanks, also provided with grooves, of the open seat of the pedicle screws. To solve the technical problem, the closure device must further comprise an engagement means (e.g.
io two hooks). For this purpose, the closure cap must be elastically maneuverable, so that it itself locks into place (hooks in) upon insertion in the seat of the pedicle screw. Furthermore, for a quick and secure removal again, respective means must be available, where a corresponding instrument, preferably a universal instrument, can engage.
~s The subject matter of the present invention is thus a pedicle screw with a closure device, comprising a seat element with a U-shaped seat recess, into which recess a closure cap is insertable for quick closure of the seat element of the pedicle screw, to receive an elastic rod element, placeable therein, which serves to stabilize a vertebral column, and to hold it with the 2o closure device via a holder, wherein the rod element, the U-shaped seat recess of the seat element and the closure cap each have a ridged or grooved surface structure, corresponding to one another, and which surface structures come into engagement with one another in a form-locking way at the respective places of contact such that the closure cap carries out the function of a cross-es brace and the forces which are active in lengthwise direction of the rod element are thereby transmittable to the pedicle screw.
The pedicle screw with the closure device according to the invention is useful for quick and secure closure and connection of an elastic rod element to a pedicle screw with a simultaneous transmission of forces from the rear rod 3o side to the flanks of the pedicle screw. The closure cap provided for the closure device is advantageously made of a biocompatible synthetic material, preferably of polyurethane of medical grade quality which can be processed through injection molding. To insert the closure cap in the matching holding element, the hooks provided on the closure cap automatically lock into place in the matching depressions in the arms of the closure device at the head of the pedicle screw, as soon as they are in the correct position. Further provided are s means making possible a simple removal of these closure devices, should this be necessary during the ongoing, or a later, operation. A kinematic reversal of hooks and depressions is likewise possible and should be covered by the definition of the present invention, although the geometry of the depressions must be adapted, which does not present an insolvable problem for one skilled io in the art.
At least one, preferably two, engagement projections provided in the seat recess serve to prefix the rod element in the seat element before the closure cap is inserted, it being possible for the rod element to be held partially as well as completely in the seat element in a form-locking way such that, for ,s position correction, a simple removal and reinsertion of the rod element is possible during an operation. For this purpose both the rod element and the seat recess have a grooved/ridged structure, fitting into one another, in transverse direction with respect to the rod element. A co-operation of the engagement projection or projections with the mentioned form-locking structure permits a prefixing in lengthwise and crosswise direction with respect to the rod element. For this purpose, the grooved structure in the interior of the seat recess is preferably extended until the ends of its arms. The mentioned engagement projections may be positioned such that, in engaged state, they exercise a slight pressure on the rod element, or penetrate into the rod in a 2s form-locking way, it also being possible to provide for a slight offsetting. In closed state, the closure device with the mentioned features also enables absorption of torsional forces exerted by the rod element.
The invention is illustrated in the attached figures with reference to examples, different features being explained with reference to their purpose so and their function.
Figure 1 shows a typical pedicle screw with seat element and closure cap according to the invention;
Figure 2 shows a side elevation of the closure cap in the pedicle screw according to the invention represented in Figure 1;
Figure 3 is a view from above of the closure cap shown in Figure 2;
Figure 4 is a further embodiment of a pedicle screw with seat s element and closure cap according to the invention;
Figure 5 is a side elevation of the closure cap of the pedicle screw shown in Figure 4;
Figure 6 is a view from above of the closure cap shown in Figure 5;
Figure 7 is a side elevation of an alternative closure cap with an S-loop;
Figure 8 is a view from above of the closure cap shown in Figure 7.
Figure 1 shows a typical embodiment of the closure device 1 according to the invention. Together with a threaded part 2, it forms a pedicle screw 3, the closure device representing its head. The seat element 4, consisting of two arms, with its U-shaped seat recess 6, serves to receive an elastic rod element 14, whereby an engagement projection 7 serves to prefix the rod element in such a way that the rod element can be removed again from a pedicle screw implanted on a vertebra, without any difficulty, during an operation, if necessary. The easy locking into place is caused by the elasticity of the rod element andJor of the U-shaped holding recess of the holding element. The rod element 14, the seat recess 6 and the holding recess 8 have a structure fitting into one another, e.g. ridges or grooves 8a, 6a, preferably in transverse direction with respect to the rod element. In the embodiment shown, for optimization of a prefixing and for early longitudinal positioning, the grooves 2s or ridges in the seat recess on its arms are extended to the ends. By means of the features mentioned, an optimal transmission of forces from the rod element 14 to the pedicle screw 3 is produced, whereby the closure cap, acting as a cross-brace (which will be described more closely in the following) engages with its holding recess 8 in the rod element 14 in a form-locking way.
If the position of the rod is correct, the closure cap 5 is placed in the seat element 4. Used to do this is an adapted instrument, such as a universal s screw driver, on which the closure cap can be put, via the recess 13, and the closure cap can be inserted in the seat recess in correct position in an exact fitting way, with an automatic locking into place. For removal or respectively correction, a further instrument is used, e.g. universal tongs, having engagement projections for insertion in the recesses 12. The closure cap has ,o engagement elements (hooks) 9 on both sides which, with deformation of the closure cap in the region of the engagement recesses 10, serve the locking into place. If the closure cap 5 is supposed to be removed again from the seat element 1, it is removed by means of the mentioned universal tongs. Through the engagement of the tongs in the recesses 12 and slight pressing together of ,s the tongs, the elastic closure cap is pressed, the engagement elements 9 being pulled out of the engagement recesses 10 and the closure cap being able to be removed again from the seat recess 6.
Figure 2 shows a sectional drawing of the closure cap of the closure device according to the invention shown in Figure 1. The reference numerals 2o correspond to the meanings indicated for Figure 1. In addition, the resilient deformation regions 15 are shown which permit a compression of the closure cap in the upper part with said special tool in the direction of the arrow in such a way that the mutual spacing of the engagement elements (hooks) is reduced, which causes an automatic locking into place and also a removal of the closure zs cap from the seat recess by disengagement.
On the two lateral flanks the surfaces are also structured, and are provided with grooves or ridges 22. In the state of being inserted in the U-shaped seat recess 6, as is shown in Figure 1, these ridges or grooves 22 engage in the corresponding surface structure of the seat recess 6 formed by so the arms. Thus a form-locking connection is created here too.
A transmission of the forces acting in Longitudinal direction in the rod element 14 thus takes place in the region where the rod element 14 is in contact with the seat recess 6, in a form-locking way directly on the pedicle screw 3. In the area of contact of the rod element 14 with the closure cap 5, s the transmission of forces takes place in a form-locking way to the closure cap 5, acting as a cross-brace, from where, once again, a form-locking transmission occurs to the arms of the U-shaped seat recess 6 of the pedicle screw 3. An optimal force transmission is thereby ensured, in particular also of bending forces, since the rod element 14 is completely surrounded.
Figure 3 is a view of the closure cap from above, the meaning of the reference numerals once again corresponding to the above definitions.
Figure 4 shows an alternative embodiment of the closure device 101 according to the invention. Together with a threaded part 102, it forms a pedicle screw 103. The seat element 104 with its U-shaped seat recess 106 serves to receive an elastic rod element 114, whereby an engagement projection 107 serves the purpose of a prefixing of the rod element 114 in such a way that the rod element can be removed again from a pedicle screw implanted on a vertebra without any difficulty during an operation, if necessary.
The rod element 114, the seat recess 106 and the holding recess 108, as well 2o as the two lateral flanks of the closure cap 105 have here too a structure fitting into one another, e.g. ridges or grooves 106a, 108a, 122, preferably in transverse direction, in order to achieve an optimal transmission of forces.
If the position of the rod element is correct, the closure cap 105 is inserted into the seat element 104. The closure cap has hooks or engagement 2s elements 109 on both sides, which, with deformation of the closure cap in the region of the engagement recesses, serve engagement in the engagement recesses 110 of the seat element 101. A buckled crosspiece 116, in engaged state, furthers the pressure on the hooks 109 and thus the firm seating of the closure cap.
Figure 5 shows a sectional drawing of the closure cap of the closure device according to the invention shown in Figure 4. The reference numerals correspond to the meanings indicated for Figure 4.
Figure 6 is a view of the closure cap from above, the meaning of the s reference numerals corresponding once again to the above definitions.
Figure 7 shows a sectional drawing of an alternative closure cap for a closure device according to the invention. The reference numerals have the following significance: 205 the closure cap; 208 the holding recess; 208a ridgeslgrooves, and 209 the hooks. 220 designates an S loop with a blind hole io for insertion of a screwdriver, a turning movement causing a moving together of the hooks 209 and thus a release of the closure cap.
Figure 8 is a view from above of the alternative closure cap according to Figure 7, the significance of the reference numerals corresponding once again to the above definitions.
Figure 3 is a view from above of the closure cap shown in Figure 2;
Figure 4 is a further embodiment of a pedicle screw with seat s element and closure cap according to the invention;
Figure 5 is a side elevation of the closure cap of the pedicle screw shown in Figure 4;
Figure 6 is a view from above of the closure cap shown in Figure 5;
Figure 7 is a side elevation of an alternative closure cap with an S-loop;
Figure 8 is a view from above of the closure cap shown in Figure 7.
Figure 1 shows a typical embodiment of the closure device 1 according to the invention. Together with a threaded part 2, it forms a pedicle screw 3, the closure device representing its head. The seat element 4, consisting of two arms, with its U-shaped seat recess 6, serves to receive an elastic rod element 14, whereby an engagement projection 7 serves to prefix the rod element in such a way that the rod element can be removed again from a pedicle screw implanted on a vertebra, without any difficulty, during an operation, if necessary. The easy locking into place is caused by the elasticity of the rod element andJor of the U-shaped holding recess of the holding element. The rod element 14, the seat recess 6 and the holding recess 8 have a structure fitting into one another, e.g. ridges or grooves 8a, 6a, preferably in transverse direction with respect to the rod element. In the embodiment shown, for optimization of a prefixing and for early longitudinal positioning, the grooves 2s or ridges in the seat recess on its arms are extended to the ends. By means of the features mentioned, an optimal transmission of forces from the rod element 14 to the pedicle screw 3 is produced, whereby the closure cap, acting as a cross-brace (which will be described more closely in the following) engages with its holding recess 8 in the rod element 14 in a form-locking way.
If the position of the rod is correct, the closure cap 5 is placed in the seat element 4. Used to do this is an adapted instrument, such as a universal s screw driver, on which the closure cap can be put, via the recess 13, and the closure cap can be inserted in the seat recess in correct position in an exact fitting way, with an automatic locking into place. For removal or respectively correction, a further instrument is used, e.g. universal tongs, having engagement projections for insertion in the recesses 12. The closure cap has ,o engagement elements (hooks) 9 on both sides which, with deformation of the closure cap in the region of the engagement recesses 10, serve the locking into place. If the closure cap 5 is supposed to be removed again from the seat element 1, it is removed by means of the mentioned universal tongs. Through the engagement of the tongs in the recesses 12 and slight pressing together of ,s the tongs, the elastic closure cap is pressed, the engagement elements 9 being pulled out of the engagement recesses 10 and the closure cap being able to be removed again from the seat recess 6.
Figure 2 shows a sectional drawing of the closure cap of the closure device according to the invention shown in Figure 1. The reference numerals 2o correspond to the meanings indicated for Figure 1. In addition, the resilient deformation regions 15 are shown which permit a compression of the closure cap in the upper part with said special tool in the direction of the arrow in such a way that the mutual spacing of the engagement elements (hooks) is reduced, which causes an automatic locking into place and also a removal of the closure zs cap from the seat recess by disengagement.
On the two lateral flanks the surfaces are also structured, and are provided with grooves or ridges 22. In the state of being inserted in the U-shaped seat recess 6, as is shown in Figure 1, these ridges or grooves 22 engage in the corresponding surface structure of the seat recess 6 formed by so the arms. Thus a form-locking connection is created here too.
A transmission of the forces acting in Longitudinal direction in the rod element 14 thus takes place in the region where the rod element 14 is in contact with the seat recess 6, in a form-locking way directly on the pedicle screw 3. In the area of contact of the rod element 14 with the closure cap 5, s the transmission of forces takes place in a form-locking way to the closure cap 5, acting as a cross-brace, from where, once again, a form-locking transmission occurs to the arms of the U-shaped seat recess 6 of the pedicle screw 3. An optimal force transmission is thereby ensured, in particular also of bending forces, since the rod element 14 is completely surrounded.
Figure 3 is a view of the closure cap from above, the meaning of the reference numerals once again corresponding to the above definitions.
Figure 4 shows an alternative embodiment of the closure device 101 according to the invention. Together with a threaded part 102, it forms a pedicle screw 103. The seat element 104 with its U-shaped seat recess 106 serves to receive an elastic rod element 114, whereby an engagement projection 107 serves the purpose of a prefixing of the rod element 114 in such a way that the rod element can be removed again from a pedicle screw implanted on a vertebra without any difficulty during an operation, if necessary.
The rod element 114, the seat recess 106 and the holding recess 108, as well 2o as the two lateral flanks of the closure cap 105 have here too a structure fitting into one another, e.g. ridges or grooves 106a, 108a, 122, preferably in transverse direction, in order to achieve an optimal transmission of forces.
If the position of the rod element is correct, the closure cap 105 is inserted into the seat element 104. The closure cap has hooks or engagement 2s elements 109 on both sides, which, with deformation of the closure cap in the region of the engagement recesses, serve engagement in the engagement recesses 110 of the seat element 101. A buckled crosspiece 116, in engaged state, furthers the pressure on the hooks 109 and thus the firm seating of the closure cap.
Figure 5 shows a sectional drawing of the closure cap of the closure device according to the invention shown in Figure 4. The reference numerals correspond to the meanings indicated for Figure 4.
Figure 6 is a view of the closure cap from above, the meaning of the s reference numerals corresponding once again to the above definitions.
Figure 7 shows a sectional drawing of an alternative closure cap for a closure device according to the invention. The reference numerals have the following significance: 205 the closure cap; 208 the holding recess; 208a ridgeslgrooves, and 209 the hooks. 220 designates an S loop with a blind hole io for insertion of a screwdriver, a turning movement causing a moving together of the hooks 209 and thus a release of the closure cap.
Figure 8 is a view from above of the alternative closure cap according to Figure 7, the significance of the reference numerals corresponding once again to the above definitions.
Claims (5)
1. A pedicle screw assembly comprising a closure device having a seat element with a U-shaped seat recess, the U-shaped recess including grooves or ridges, an elastic rod element having grooves or ridges, the grooves or ridges of the elastic rod element extending in a transverse direction with respect to a lengthwise direction of the elastic rod element, an elastic closure cap having grooves or ridges, the elastic closure cap being inserted internally of the U-shaped seat recess for quick closure of the seat element and thereby forming a substantially circumferential enclosure between the U-shaped seat recess and the closure cap to receive the elastic rod element placeable within the substantially circumferential enclosure between the U-shaped seat recess and the closure cap for stabilizing a vertebral column and to hold the surrounded and engaged elastic rod element with the closure device, holder elements of the elastic closure cap securing the closure cap in the seat element, the grooves or ridges of the U-shaped seat recess of the seat element and the grooves or ridges of the elastic closure cap each corresponding to one another, and the respective grooves or ridges engaging one another in a form-locking way at places of contact such that the elastic rod element carries out the function of a cross-brace and forces which are active in a lengthwise direction of the elastic rod element along a longitudinal axis of the elastic rod element are thereby transmittable to the closure device, the respective grooves or ridges of the U-shaped seat recess of the seat element and the elastic closure cap being aligned transversely to the lengthwise direction of the elastic rod element, and the grooves or ridges in the seat recess being extended until ends of two arms formed by the seat element and the respective grooves or ridges in the seat recess fitting into the grooves or ridges in the elastic rod element.
2. The pedicle screw assembly according to claim 1, wherein the holder elements include engagement elements disposed on the closure cap and matching receiving openings in the U-shaped seat recess automatically locking the engagement elements into place in the receiving openings during placement of the closure cap in the seat element.
3. The pedicle screw assembly according to claim 2, wherein the engagement elements include at least two oppositely directed hooks, resiliently disposed relative to one another so that the closure cap is able to engage in the receiving openings provided on the two arms of the seat element in the inserted state.
4. The pedicle screw assembly according to claim 3, wherein the closure cap is provided with depressions or projections next to the resiliently disposed hooks, the depressions or projections are engaged by an instrument in a central depression in the closure cap, and a separation between the hooks is reduced through pressing together of the depressions or projections, which, upon disengagement from the receiving openings, allows a removal of the closure cap from the seat element.
5. The pedicle screw assembly according to claim 1, wherein at least one engagement projection is provided in the U-shaped seat recess at a position where an engagement of the elastic rod element is performed in such a way that upon insertion a correctable pre-fixing with torsion blocking is achieved.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH03405786.9 | 2003-10-31 | ||
| EP03405786A EP1527742B1 (en) | 2003-10-31 | 2003-10-31 | Locking cap for pedicle screws for fixing of elastic rods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2485157A1 CA2485157A1 (en) | 2005-04-30 |
| CA2485157C true CA2485157C (en) | 2010-09-14 |
Family
ID=34400628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2485157A Expired - Fee Related CA2485157C (en) | 2003-10-31 | 2004-10-14 | Pedicle screw with a closure device for the fixing of elastic rod elements |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7597707B2 (en) |
| EP (1) | EP1527742B1 (en) |
| JP (1) | JP4589693B2 (en) |
| AT (1) | ATE333841T1 (en) |
| CA (1) | CA2485157C (en) |
| DE (1) | DE50304374D1 (en) |
| ES (1) | ES2269957T3 (en) |
Families Citing this family (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8353932B2 (en) | 2005-09-30 | 2013-01-15 | Jackson Roger P | Polyaxial bone anchor assembly with one-piece closure, pressure insert and plastic elongate member |
| US6740086B2 (en) * | 2002-04-18 | 2004-05-25 | Spinal Innovations, Llc | Screw and rod fixation assembly and device |
| US7842073B2 (en) | 2002-04-18 | 2010-11-30 | Aesculap Ii, Inc. | Screw and rod fixation assembly and device |
| CH705709B1 (en) | 2005-08-29 | 2013-05-15 | Bird Biedermann Ag | Spinal implant. |
| DE502006002049D1 (en) * | 2005-09-13 | 2008-12-24 | Bird Biedermann Ag | Dynamic clamping device for spinal implant |
| DE602005008752D1 (en) | 2005-11-17 | 2008-09-18 | Biedermann Motech Gmbh | Polyaxial screw for flexible rod |
| EP1815812B1 (en) * | 2006-02-03 | 2009-07-29 | Spinelab AG | Spinal implant |
| CN101500515A (en) * | 2006-03-22 | 2009-08-05 | 先锋外科技术公司 | Low top bone fixation system and method for using the same |
| DE602006016407D1 (en) | 2006-05-16 | 2010-10-07 | Biedermann Motech Gmbh | Longitudinal part for spine or trauma surgery |
| US8043337B2 (en) | 2006-06-14 | 2011-10-25 | Spartek Medical, Inc. | Implant system and method to treat degenerative disorders of the spine |
| WO2008022268A2 (en) | 2006-08-16 | 2008-02-21 | Pioneer Surgical Technology, Inc. | Spinal rod anchor device and method |
| ES2336815T5 (en) | 2006-09-15 | 2013-05-16 | Biedermann Technologies Gmbh & Co. Kg | Bone anchoring device |
| US8636783B2 (en) * | 2006-12-29 | 2014-01-28 | Zimmer Spine, Inc. | Spinal stabilization systems and methods |
| EP2117451A1 (en) * | 2006-12-29 | 2009-11-18 | Zimmer Spine Austin, Inc. | Spinal stabilization systems and methods |
| ES2392351T3 (en) * | 2007-02-23 | 2012-12-07 | Biedermann Technologies Gmbh & Co. Kg | Device to stabilize vertebrae |
| US8070776B2 (en) | 2007-06-05 | 2011-12-06 | Spartek Medical, Inc. | Deflection rod system for use with a vertebral fusion implant for dynamic stabilization and motion preservation spinal implantation system and method |
| US8048121B2 (en) | 2007-06-05 | 2011-11-01 | Spartek Medical, Inc. | Spine implant with a defelction rod system anchored to a bone anchor and method |
| US8147520B2 (en) | 2007-06-05 | 2012-04-03 | Spartek Medical, Inc. | Horizontally loaded dynamic stabilization and motion preservation spinal implantation system and method |
| US8092501B2 (en) | 2007-06-05 | 2012-01-10 | Spartek Medical, Inc. | Dynamic spinal rod and method for dynamic stabilization of the spine |
| US8105359B2 (en) | 2007-06-05 | 2012-01-31 | Spartek Medical, Inc. | Deflection rod system for a dynamic stabilization and motion preservation spinal implantation system and method |
| US8114134B2 (en) | 2007-06-05 | 2012-02-14 | Spartek Medical, Inc. | Spinal prosthesis having a three bar linkage for motion preservation and dynamic stabilization of the spine |
| US8021396B2 (en) | 2007-06-05 | 2011-09-20 | Spartek Medical, Inc. | Configurable dynamic spinal rod and method for dynamic stabilization of the spine |
| US8048115B2 (en) | 2007-06-05 | 2011-11-01 | Spartek Medical, Inc. | Surgical tool and method for implantation of a dynamic bone anchor |
| US8083772B2 (en) | 2007-06-05 | 2011-12-27 | Spartek Medical, Inc. | Dynamic spinal rod assembly and method for dynamic stabilization of the spine |
| ES2375539T3 (en) * | 2007-07-20 | 2012-03-01 | Biedermann Motech Gmbh | BONE ANCHORAGE DEVICE. |
| US8398683B2 (en) * | 2007-10-23 | 2013-03-19 | Pioneer Surgical Technology, Inc. | Rod coupling assembly and methods for bone fixation |
| US8016861B2 (en) | 2008-02-26 | 2011-09-13 | Spartek Medical, Inc. | Versatile polyaxial connector assembly and method for dynamic stabilization of the spine |
| US8333792B2 (en) | 2008-02-26 | 2012-12-18 | Spartek Medical, Inc. | Load-sharing bone anchor having a deflectable post and method for dynamic stabilization of the spine |
| US8337536B2 (en) | 2008-02-26 | 2012-12-25 | Spartek Medical, Inc. | Load-sharing bone anchor having a deflectable post with a compliant ring and method for stabilization of the spine |
| US8267979B2 (en) | 2008-02-26 | 2012-09-18 | Spartek Medical, Inc. | Load-sharing bone anchor having a deflectable post and axial spring and method for dynamic stabilization of the spine |
| US8211155B2 (en) | 2008-02-26 | 2012-07-03 | Spartek Medical, Inc. | Load-sharing bone anchor having a durable compliant member and method for dynamic stabilization of the spine |
| US8083775B2 (en) | 2008-02-26 | 2011-12-27 | Spartek Medical, Inc. | Load-sharing bone anchor having a natural center of rotation and method for dynamic stabilization of the spine |
| US8097024B2 (en) | 2008-02-26 | 2012-01-17 | Spartek Medical, Inc. | Load-sharing bone anchor having a deflectable post and method for stabilization of the spine |
| US8057515B2 (en) | 2008-02-26 | 2011-11-15 | Spartek Medical, Inc. | Load-sharing anchor having a deflectable post and centering spring and method for dynamic stabilization of the spine |
| US20100030224A1 (en) | 2008-02-26 | 2010-02-04 | Spartek Medical, Inc. | Surgical tool and method for connecting a dynamic bone anchor and dynamic vertical rod |
| DE602008002815D1 (en) * | 2008-03-28 | 2010-11-11 | Biedermann Motech Gmbh | Bone anchoring device |
| US20100004693A1 (en) * | 2008-07-01 | 2010-01-07 | Peter Thomas Miller | Cam locking spine stabilization system and method |
| US8118837B2 (en) * | 2008-07-03 | 2012-02-21 | Zimmer Spine, Inc. | Tapered-lock spinal rod connectors and methods for use |
| US8167914B1 (en) | 2008-07-16 | 2012-05-01 | Zimmer Spine, Inc. | Locking insert for spine stabilization and method of use |
| US8197512B1 (en) | 2008-07-16 | 2012-06-12 | Zimmer Spine, Inc. | System and method for spine stabilization using resilient inserts |
| US8287571B2 (en) | 2008-08-12 | 2012-10-16 | Blackstone Medical, Inc. | Apparatus for stabilizing vertebral bodies |
| ES2376135T3 (en) | 2008-08-12 | 2012-03-09 | Biedermann Motech Gmbh | MODULAR SYSTEM FOR THE STABILIZATION OF THE VERTEBRAL COLUMN. |
| US8506601B2 (en) * | 2008-10-14 | 2013-08-13 | Pioneer Surgical Technology, Inc. | Low profile dual locking fixation system and offset anchor member |
| US8636778B2 (en) * | 2009-02-11 | 2014-01-28 | Pioneer Surgical Technology, Inc. | Wide angulation coupling members for bone fixation system |
| US20100292739A1 (en) * | 2009-05-15 | 2010-11-18 | Warsaw Orthopedic, Inc. | Bone Screws With Improved Locking Mechanisms |
| KR101697492B1 (en) | 2009-07-16 | 2017-01-18 | 스파인세이브 아게 | Anchorage arrangement for a connecting rod for the stabilization of the spine |
| CN102695465A (en) | 2009-12-02 | 2012-09-26 | 斯帕泰克医疗股份有限公司 | Low profile spinal prosthesis incorporating a bone anchor having a deflectable post and a compound spinal rod |
| US20110307015A1 (en) | 2010-06-10 | 2011-12-15 | Spartek Medical, Inc. | Adaptive spinal rod and methods for stabilization of the spine |
| US8430916B1 (en) | 2012-02-07 | 2013-04-30 | Spartek Medical, Inc. | Spinal rod connectors, methods of use, and spinal prosthesis incorporating spinal rod connectors |
Family Cites Families (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4448191A (en) * | 1981-07-07 | 1984-05-15 | Rodnyansky Lazar I | Implantable correctant of a spinal curvature and a method for treatment of a spinal curvature |
| US4805602A (en) * | 1986-11-03 | 1989-02-21 | Danninger Medical Technology | Transpedicular screw and rod system |
| US4950269A (en) * | 1988-06-13 | 1990-08-21 | Acromed Corporation | Spinal column fixation device |
| US5257993A (en) * | 1991-10-04 | 1993-11-02 | Acromed Corporation | Top-entry rod retainer |
| DE59310397D1 (en) * | 1993-07-02 | 2009-07-09 | Synthes Gmbh | Posterior spine implant |
| US5380326A (en) * | 1993-11-12 | 1995-01-10 | Lin; Chih-I | Clamping device for vertebral locking rod |
| WO1995013755A1 (en) | 1993-11-19 | 1995-05-26 | Cross Medical Products, Inc. | Rod anchor seat having sliding closure member |
| US5403316A (en) * | 1993-12-02 | 1995-04-04 | Danek Medical, Inc. | Triangular construct for spinal fixation |
| FR2724553B1 (en) * | 1994-09-15 | 1996-12-20 | Tornier Sa | EXTERNAL OR INTERNAL FIXER FOR THE REPAIR OF FRACTURES OR ARTHROPLASTIES OF THE SKELETON |
| FR2726171B1 (en) * | 1994-10-28 | 1997-01-24 | Jbs Sa | REHABITABLE CONNECTING SCREW DEVICE FOR BONE JOINT, IN PARTICULAR FOR STABILIZING AT LEAST TWO VERTEBRES |
| US5562663A (en) * | 1995-06-07 | 1996-10-08 | Danek Medical, Inc. | Implant interconnection mechanism |
| DE29606468U1 (en) * | 1996-04-09 | 1997-08-07 | Link Waldemar Gmbh Co | Spinal fixator |
| FR2778089B1 (en) * | 1998-04-30 | 2000-07-21 | Dimso Sa | SPINAL OSTEOSYNTHESIS SYSTEM WITH FLANGE AND LATCH |
| US6565565B1 (en) * | 1998-06-17 | 2003-05-20 | Howmedica Osteonics Corp. | Device for securing spinal rods |
| US5989251A (en) * | 1998-06-17 | 1999-11-23 | Surgical Dynamics, Inc. | Apparatus for spinal stabilization |
| FR2780269B1 (en) * | 1998-06-26 | 2003-10-17 | Euros Sa | RACHIDIAN IMPLANT |
| US6110172A (en) * | 1998-07-31 | 2000-08-29 | Jackson; Roger P. | Closure system for open ended osteosynthesis apparatus |
| US6302888B1 (en) * | 1999-03-19 | 2001-10-16 | Interpore Cross International | Locking dovetail and self-limiting set screw assembly for a spinal stabilization member |
| FR2795623B1 (en) * | 1999-07-01 | 2001-11-30 | Gerard Vanacker | SYSTEM FOR OSTEOSYNTHESIS ON THE SPINE, PARTICULARLY FOR THE STABILIZATION OF VERTEBRAES, FIXING AND ANCILLARY ELEMENT FOR SUCH A SYSTEM |
| DE19951145C2 (en) * | 1999-10-23 | 2003-11-13 | Schaefer Micomed Gmbh | osteosynthesis |
| US6565566B1 (en) * | 2000-03-22 | 2003-05-20 | Spinal Concepts, Inc. | Sacral screw assembly and method |
| JP2001314416A (en) * | 2000-05-10 | 2001-11-13 | Showa Ika Kohgyo Co Ltd | Rod for bone connector |
| US20030004511A1 (en) | 2001-06-27 | 2003-01-02 | Ferree Bret A. | Polyaxial pedicle screw system |
| DE60144067D1 (en) * | 2001-08-13 | 2011-03-31 | Laurence M Mckinley | SWIVEL ALIGNMENT AND FIXING ARRANGEMENT |
| CN1221217C (en) * | 2002-01-24 | 2005-10-05 | 英属维京群岛商冠亚生技控股集团股份有限公司 | Rotary button fixator for vertebration fixing |
| US6966910B2 (en) * | 2002-04-05 | 2005-11-22 | Stephen Ritland | Dynamic fixation device and method of use |
| US6843791B2 (en) * | 2003-01-10 | 2005-01-18 | Depuy Acromed, Inc. | Locking cap assembly for spinal fixation instrumentation |
| US6986771B2 (en) * | 2003-05-23 | 2006-01-17 | Globus Medical, Inc. | Spine stabilization system |
| JP2005007048A (en) * | 2003-06-20 | 2005-01-13 | Robert Reed Shokai Co Ltd | Device for fixing shaft body |
| TW200518711A (en) * | 2003-12-11 | 2005-06-16 | A Spine Holding Group Corp | Rotation buckling ball-head spine restoring equipment |
-
2003
- 2003-10-31 ES ES03405786T patent/ES2269957T3/en not_active Expired - Lifetime
- 2003-10-31 AT AT03405786T patent/ATE333841T1/en not_active IP Right Cessation
- 2003-10-31 EP EP03405786A patent/EP1527742B1/en not_active Expired - Lifetime
- 2003-10-31 DE DE50304374T patent/DE50304374D1/en not_active Expired - Lifetime
-
2004
- 2004-10-14 CA CA2485157A patent/CA2485157C/en not_active Expired - Fee Related
- 2004-10-18 US US10/965,841 patent/US7597707B2/en not_active Expired - Fee Related
- 2004-10-26 JP JP2004310654A patent/JP4589693B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2485157A1 (en) | 2005-04-30 |
| JP2005131394A (en) | 2005-05-26 |
| ES2269957T3 (en) | 2007-04-01 |
| ATE333841T1 (en) | 2006-08-15 |
| EP1527742B1 (en) | 2006-07-26 |
| US7597707B2 (en) | 2009-10-06 |
| EP1527742A1 (en) | 2005-05-04 |
| JP4589693B2 (en) | 2010-12-01 |
| DE50304374D1 (en) | 2006-09-07 |
| US20050096659A1 (en) | 2005-05-05 |
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| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20151014 |