US20070260246A1 - Locking device for securing a rod-shaped element in a holding element connected to a shank - Google Patents
Locking device for securing a rod-shaped element in a holding element connected to a shank Download PDFInfo
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- US20070260246A1 US20070260246A1 US11/789,454 US78945407A US2007260246A1 US 20070260246 A1 US20070260246 A1 US 20070260246A1 US 78945407 A US78945407 A US 78945407A US 2007260246 A1 US2007260246 A1 US 2007260246A1
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- Prior art keywords
- thread
- locking element
- rod
- locking device
- legs
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- 238000001356 surgical procedure Methods 0.000 claims description 3
- 210000000988 bone and bone Anatomy 0.000 description 13
- 238000010276 construction Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
-
- 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
-
- 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
- A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
Definitions
- the invention relates to a locking device for use in spinal column or accident surgery for securing a rod-shaped element in a holding element connected to a shank.
- the invention further relates to an element with a shank and a holding element connected to it for connecting to a rod with a locking device of this kind.
- a spinal column implant with a receiving part with a U-shaped recess for receiving a rod is known, respectively, wherein the open legs formed by the U-shaped recess have an inner thread.
- a locking element which can be screwed in between the legs, with an outer thread, a central bore with inner thread and an inner screw which can be screwed into the locking element is provided.
- a security sleeve encircling the legs from outside is used to avoid splaying of the legs.
- the invention is suitable for both monoaxial and polyaxial bone screws, as it allows fixing of the rod or the rod and the head of the bone screw in the final state to cooperate in such a way that there is secure blocking against loosening or detaching of the locking mechanism.
- FIG. 1 shows a first embodiment in perspective exploded illustration.
- FIG. 2 a shows a schematic illustration of the forces acting on the locking element of FIG. 1 before the inner screw is screwed in.
- FIG. 2 b shows a schematic illustration of the forces acting on the locking element of FIG. 1 after the inner screw has been screwed in.
- FIG. 3 shows a sectional view of a second embodiment.
- FIG. 4 shows a sectional view of a third embodiment.
- FIG. 5 shows a sectional view of a detail of a fourth embodiment.
- FIG. 6 shows a sectional view of a detail of a fifth embodiment.
- FIG. 7 shows a sectional view of a detail of a sixth embodiment.
- FIG. 8 shows a sectional view of a detail of a seventh embodiment.
- the element according to the invention in the embodiment illustrated in FIG. 1 of the figures is constructed as a monoaxial bone screw. It has a shank 1 with a bone screw section and a receiving part 2 , rigidly connected to it, for receiving a rod 100 connecting the bone screw to further bone screws.
- the receiving part is provided with a recess 3 with a U-shaped cross-section, which is dimensioned just large enough for the rod 100 to be placed in and fit into the bottom of the recess.
- two open legs 4 , 5 are formed with in each case one open end 6 , which forms the upper edge of the receiving part 2 .
- the legs 4 , 5 have an inner thread 7 adjacent to the open end 6 .
- a sleeve-type or nut-type locking element 8 which can be screwed in between the legs 4 , 5 , is provided, with an outer thread 9 cooperating with the inner thread 7 of the legs and an inner thread 10 .
- the locking element 8 has a first front end 11 and opposite this a second end 12 .
- Radially running notches 13 are provided on the first front end 11 for bringing into engagement with a screwing in tool.
- One of the notches extends through the entire locking element 8 in the axial direction and thus forms a slit 14 in such a way that the locking element has a certain elasticity in the manner of a straining ring.
- the length of the locking element 8 in the axial direction is dimensioned in such a way that the locking element can be fully screwed in between the legs 4 , 5 .
- an inner screw or clamping or set screw 15 which can be screwed into the locking element and the outer thread 16 of which cooperates with the inner thread 10 of the locking element 8 .
- the inner screw 15 has on one of its ends a recess 17 for bringing into engagement with a screw tool.
- the inner thread 7 of the legs, the outer thread 9 of the locking element and also the inner thread 10 of the locking element and the outer thread 16 of the inner screw 15 are formed as metric threads.
- the bone screw 100 is first screwed into the bone and then the rod 100 is placed in.
- the locking element 8 is then screwed in with the inner screw 15 already screwed in, but not yet touching the rod with its underside, whereby the rod is at first only prevented from tilting out, but is still displaceable.
- the locking element 8 is screwed in no splaying of the legs 4 , 5 arises, owing to the slit and therefore elastic construction, but, as shown in FIG. 2 a, the legs put up a resistance to the slit locking element, which tries to press it together, as depicted by the inwardly directed arrows.
- the inner screw 15 is then screwed in until it presses with its underside on the rod and fixes it.
- a radially outwardly directed force component acts on the locking element 8 , as illustrated by the arrows in FIG. 2 b, whereby the outer thread 9 of the locking element is pressed into the inner thread 7 of the legs and is there blocked. This guarantees locking secured against loosening.
- the element according to the invention is constructed as a polyaxial screw which has a screw element with a thread shank 1 with a bone thread and a head 20 shaped like a segment of a sphere, which is connected to a receiving part 21 .
- the receiving part 21 has on one of its ends a first bore 22 , aligned symmetrically to the axis, the diameter of which is larger than that of the thread section of the shank 1 and smaller than that of the head 20 .
- the receiving part 21 further has a coaxial second bore 23 , which is open at the end opposite the first bore 22 and the diameter of which is large enough for the screw element to be inserted through the open end with its thread section through the first bore 22 and with the head 20 as far as the bottom of the second bore 23 .
- a small coaxial section 24 is provided, which is immediately adjacent to the first bore 22 and is constructed as spherical towards the open end, wherein the radius is substantially identical to the section of the head 20 shaped like a segment of a sphere.
- Receiving part 21 like receiving part 2 of the first embodiment, has a U-shaped recess 25 , arranged symmetrically to the centre of the part, the bottom of which is directed towards the first bore 22 and by which two open legs 26 , 27 are formed, the open end 28 of which forms the edge of the receiving part 21 .
- the legs 26 , 27 have an inner thread 29 in an area adjacent to the open end 28 .
- a pressure element 30 which is constructed in such a way that on its side facing the head 20 it has a spherical indentation 31 , the radius of which is substantially identical to the radius of the section of the head 20 shaped like a segment of a sphere.
- the outer diameter of the pressure element is chosen in such a way that the pressure element can perform a sliding movement in the receiving part 21 , in other words is displaceable towards the head 20 .
- the pressure element further has a coaxial bore 32 for access to a recess 33 in the screw head 20 for bringing into engagement with a screwing in tool.
- Construction of the locking element 8 and the inner thread 15 is as in the first embodiment.
- the screw element is screwed into the bone after being placed into the receiving part 21 .
- the pressure element 30 and the rod 100 are then inserted in turn.
- the screw head 20 is still swivellable.
- the third embodiment illustrated in FIG. 4 also shows a polyiaxial bone screw. Parts corresponding to the second embodiment are provided with the same reference numerals. The third embodiment differs from the second embodiment substantially in the construction of the pressure element 40 .
- the pressure element 40 of this embodiment is substantially constructed as cylindrical with an outer diameter which is chosen in such a way that the pressure element 40 can slide in the second bore 23 of the receiving part 21 ′.
- a recess 41 On one of its ends a recess 41 , shaped like a segment of a sphere and widening towards the end is provided, the sphere radius of which is chosen in such a way that, in a state inserted into the receiving part, it partially encircles the head 20 of the screw element.
- a substantial difference from the pressure element 30 of the second embodiment is that the pressure element 40 of the third embodiment is lengthened in the direction of the open end 28 of the legs.
- the pressure element 40 has on its end opposite the recess 42 shaped like a segment of a sphere a U-shaped recess 42 , wherein the dimensions of the U-shaped recesses of the pressure element are such that the rod 100 can be placed in the channel formed thereby.
- the depth of the U-shaped recess 42 seen in the direction of the cylindrical axis of the receiving part 21 ′ is larger than the diameter of the rod 100 to be received, so that the pressure element 40 projects upwards above the placed in rod 100 with lateral legs 43 .
- the pressure element 40 further has a central bore 44 extending therethrough. The diameter of the central bore 44 is just large enough for a screw tool for bringing into engagement with the recess 33 provided in the head 20 to be guided through.
- Construction of the locking element 8 and the inner thread 15 is as in the first and second embodiments.
- the third embodiment shown in FIG. 4 differs from the second embodiment shown in FIG. 3 in that via the locking element 8 the head 20 is first blocked in its position, in which the locking element 8 presses on the lengthened legs 43 of the pressure element 40 and therefore on the head 20 .
- the rod 100 is then fixed independently of the head 20 .
- the locking effect caused by the cooperation of locking element 8 and inner screw 15 is otherwise as in the first and second embodiments.
- FIGS. 5 to 7 differ from the third embodiment shown in FIG. 4 in the type of inner thread 7 of the legs 26 , 27 of the receiving part 21 ′ and the corresponding outer thread 9 of the locking element 8 .
- the inner thread 10 of the locking element 8 and the outer thread 16 of the inner screw are constructed in these embodiments in each case as metric threads.
- the inner thread 29 of the legs 26 , 27 is constructed in such a way that the flank 29 a facing away from the open end encloses a negative angle a with a plane running perpendicular to the central axis M of the receiving part.
- flank 9 b of the outer thread 9 of the locking element 8 facing away from the open end in the screwed in state encloses a negative angle with a plane running horizontally to the screw axis S.
- the dimensions of the inner thread of the legs and the outer thread of the locking element are such that in the unloaded state there is a gap between the flanks 29 a and 29 b mentioned.
- the legs 26 , 27 experience a force component directed radially inwards owing to the negative flank angle when the locking element 8 is tightened, wherein the flanks 29 a and lob come to be on top of one another, so the legs are slightly pulled together. This gives rise to reliable blocking of the head 20 via the pressure element 40 .
- the locking element 8 splays out owing to the force component which is then acting radially outwards and therefore acts against the force pulling the legs together.
- the rod is fixed and simultaneously blocking of the locking element 8 and legs against one another takes place.
- FIG. 6 differs from the embodiment shown in FIG. 5 in the construction of the threads 28 , 9 as saw tooth threads with a load flank 29 a or 19 b running horizontally to the central axis M or screw axis S. This also demonstrates the function according to the invention of the locking element.
- the embodiment shown in FIG. 7 differs from the embodiment shown in FIGS. 5 and 6 in that the inner thread 29 of the legs and the outer thread 9 of the locking element are constructed as a flat thread. This has two flanks 29 a, 29 b or 9 a, 9 b, running horizontally to the central axis M or screw axis S.
- the thread cross-section is constructed as substantially rectangular. This also demonstrates the function according to the invention of the locking element.
- a flank play is also provided in the thread forms shown in FIGS. 6 and 7 in such a way that blocking of the locking element is possible after the inner screw has been screwed in.
- the locking element 80 is provided with a ring-shaped projection 81 on its front end which has the notches 13 .
- the slit 14 extends in this case, as in locking element 8 , at least through the axial section in which the outer thread 9 is provided, but not through the projection 81 .
- the slit 14 is further arranged in the circumferential direction in such a way that it extends into one of the notches 13 .
- the projection 81 forms a stop which limits the force on the pressure element to a predetermined value.
- the receiving part in which the receiving part is connected to a bone screw, the receiving part can also be connected to a hook, as used in spinal column surgery for hooking in behind bone projections of the spinal column.
- a bar or a rod-shaped element is provided, which has on both ends a head shaped like a segment of a sphere, which is connected to a receiving part of the kind described. In this way an element of this kind can be used as a connecting element between two rods 100 .
Abstract
An element with a shank (1) and a holding element (2; 21; 21′) connected to it for connecting to a rod (100) is provided, wherein the holding element (2; 21; 21′) has a recess having a U-shaped cross-section for receiving the rod with two legs (4, 5; 26, 27) open at one end (6, 28) and an inner thread (7; 29) on the open legs and with a locking element (8; 80) with an outer thread (9) in at least one section of its outer wall, wherein the outer thread (9) cooperates with the inner thread (7; 29) of the legs and wherein the locking element has a central bore, characterised in that the locking element (8, 80) has a slit (14) extending substantially in the axial direction through its outer wall.
Description
- The invention relates to a locking device for use in spinal column or accident surgery for securing a rod-shaped element in a holding element connected to a shank. The invention further relates to an element with a shank and a holding element connected to it for connecting to a rod with a locking device of this kind.
- From WO 95/01132 and U.S. Pat. No. 6,224,598 B1 a spinal column implant with a receiving part with a U-shaped recess for receiving a rod is known, respectively, wherein the open legs formed by the U-shaped recess have an inner thread. To fix the rod a locking element, which can be screwed in between the legs, with an outer thread, a central bore with inner thread and an inner screw which can be screwed into the locking element is provided. In the device known from WO 95/01132 a security sleeve encircling the legs from outside is used to avoid splaying of the legs.
- It is the object of the invention to create a locking device of the kind initially described which guarantees improved security against loosening or detaching of the locking elements and at the same time is compactly built and easy to produce.
- This object is achieved by the locking device characterised in claim 1 or by the element characterised in claim 5. Further developments of the invention are given in the subordinate claims.
- The invention is suitable for both monoaxial and polyaxial bone screws, as it allows fixing of the rod or the rod and the head of the bone screw in the final state to cooperate in such a way that there is secure blocking against loosening or detaching of the locking mechanism.
- Further features and advantages of the invention emerge from the description of embodiment examples using the figures.
-
FIG. 1 shows a first embodiment in perspective exploded illustration. -
FIG. 2 a shows a schematic illustration of the forces acting on the locking element ofFIG. 1 before the inner screw is screwed in. -
FIG. 2 b shows a schematic illustration of the forces acting on the locking element ofFIG. 1 after the inner screw has been screwed in. -
FIG. 3 shows a sectional view of a second embodiment. -
FIG. 4 shows a sectional view of a third embodiment. -
FIG. 5 shows a sectional view of a detail of a fourth embodiment. -
FIG. 6 shows a sectional view of a detail of a fifth embodiment. -
FIG. 7 shows a sectional view of a detail of a sixth embodiment. -
FIG. 8 shows a sectional view of a detail of a seventh embodiment. - The element according to the invention in the embodiment illustrated in
FIG. 1 of the figures is constructed as a monoaxial bone screw. It has a shank 1 with a bone screw section and a receivingpart 2, rigidly connected to it, for receiving arod 100 connecting the bone screw to further bone screws. For this purpose the receiving part is provided with arecess 3 with a U-shaped cross-section, which is dimensioned just large enough for therod 100 to be placed in and fit into the bottom of the recess. By the U-shaped recess 3 two open legs 4, 5 are formed with in each case oneopen end 6, which forms the upper edge of thereceiving part 2. The legs 4, 5 have aninner thread 7 adjacent to theopen end 6. - To lock the
rod 100 in the recess 3 a sleeve-type or nut-type locking element 8, which can be screwed in between the legs 4, 5, is provided, with anouter thread 9 cooperating with theinner thread 7 of the legs and aninner thread 10. Thelocking element 8 has a firstfront end 11 and opposite this asecond end 12. Radially runningnotches 13 are provided on the firstfront end 11 for bringing into engagement with a screwing in tool. One of the notches extends through theentire locking element 8 in the axial direction and thus forms aslit 14 in such a way that the locking element has a certain elasticity in the manner of a straining ring. The length of thelocking element 8 in the axial direction is dimensioned in such a way that the locking element can be fully screwed in between the legs 4, 5. - Further provided is an inner screw or clamping or set
screw 15, which can be screwed into the locking element and theouter thread 16 of which cooperates with theinner thread 10 of thelocking element 8. Theinner screw 15 has on one of its ends arecess 17 for bringing into engagement with a screw tool. - In the embodiment shown in
FIG. 1 theinner thread 7 of the legs, theouter thread 9 of the locking element and also theinner thread 10 of the locking element and theouter thread 16 of theinner screw 15 are formed as metric threads. - In operation the
bone screw 100 is first screwed into the bone and then therod 100 is placed in. Thelocking element 8 is then screwed in with theinner screw 15 already screwed in, but not yet touching the rod with its underside, whereby the rod is at first only prevented from tilting out, but is still displaceable. When thelocking element 8 is screwed in no splaying of the legs 4, 5 arises, owing to the slit and therefore elastic construction, but, as shown inFIG. 2 a, the legs put up a resistance to the slit locking element, which tries to press it together, as depicted by the inwardly directed arrows. Theinner screw 15 is then screwed in until it presses with its underside on the rod and fixes it. Owing to the tightening of theinner screw 15, a radially outwardly directed force component acts on thelocking element 8, as illustrated by the arrows inFIG. 2 b, whereby theouter thread 9 of the locking element is pressed into theinner thread 7 of the legs and is there blocked. This guarantees locking secured against loosening. - In the embodiment shown in
FIG. 3 the element according to the invention is constructed as a polyaxial screw which has a screw element with a thread shank 1 with a bone thread and ahead 20 shaped like a segment of a sphere, which is connected to areceiving part 21. Thereceiving part 21 has on one of its ends afirst bore 22, aligned symmetrically to the axis, the diameter of which is larger than that of the thread section of the shank 1 and smaller than that of thehead 20. Thereceiving part 21 further has a coaxialsecond bore 23, which is open at the end opposite thefirst bore 22 and the diameter of which is large enough for the screw element to be inserted through the open end with its thread section through thefirst bore 22 and with thehead 20 as far as the bottom of thesecond bore 23. Between the first and the second bore a smallcoaxial section 24 is provided, which is immediately adjacent to thefirst bore 22 and is constructed as spherical towards the open end, wherein the radius is substantially identical to the section of thehead 20 shaped like a segment of a sphere. Receivingpart 21, like receivingpart 2 of the first embodiment, has a U-shapedrecess 25, arranged symmetrically to the centre of the part, the bottom of which is directed towards thefirst bore 22 and by which twoopen legs open end 28 of which forms the edge of thereceiving part 21. Thelegs inner thread 29 in an area adjacent to theopen end 28. - Further provided is a
pressure element 30, which is constructed in such a way that on its side facing thehead 20 it has aspherical indentation 31, the radius of which is substantially identical to the radius of the section of thehead 20 shaped like a segment of a sphere. The outer diameter of the pressure element is chosen in such a way that the pressure element can perform a sliding movement in thereceiving part 21, in other words is displaceable towards thehead 20. The pressure element further has acoaxial bore 32 for access to arecess 33 in thescrew head 20 for bringing into engagement with a screwing in tool. - Construction of the
locking element 8 and theinner thread 15 is as in the first embodiment. - In operation the screw element is screwed into the bone after being placed into the
receiving part 21. Thepressure element 30 and therod 100 are then inserted in turn. At this stage thescrew head 20 is still swivellable. By screwing in thelocking element 8 and theinner thread 15 in the same way as in the first embodiment the screw element and thereceiving part 21 are fixed to one another and therefore therod 100 is also fixed. - The third embodiment illustrated in
FIG. 4 also shows a polyiaxial bone screw. Parts corresponding to the second embodiment are provided with the same reference numerals. The third embodiment differs from the second embodiment substantially in the construction of thepressure element 40. - The
pressure element 40 of this embodiment is substantially constructed as cylindrical with an outer diameter which is chosen in such a way that thepressure element 40 can slide in thesecond bore 23 of thereceiving part 21′. On one of its ends arecess 41, shaped like a segment of a sphere and widening towards the end is provided, the sphere radius of which is chosen in such a way that, in a state inserted into the receiving part, it partially encircles thehead 20 of the screw element. A substantial difference from thepressure element 30 of the second embodiment is that thepressure element 40 of the third embodiment is lengthened in the direction of theopen end 28 of the legs. For this purpose it has on its end opposite therecess 42 shaped like a segment of a sphere aU-shaped recess 42, wherein the dimensions of the U-shaped recesses of the pressure element are such that therod 100 can be placed in the channel formed thereby. The depth of the U-shaped recess 42, seen in the direction of the cylindrical axis of thereceiving part 21′ is larger than the diameter of therod 100 to be received, so that thepressure element 40 projects upwards above the placed inrod 100 withlateral legs 43. Thepressure element 40 further has a central bore 44 extending therethrough. The diameter of the central bore 44 is just large enough for a screw tool for bringing into engagement with therecess 33 provided in thehead 20 to be guided through. - Construction of the
locking element 8 and theinner thread 15 is as in the first and second embodiments. - In operation the third embodiment shown in
FIG. 4 differs from the second embodiment shown inFIG. 3 in that via thelocking element 8 thehead 20 is first blocked in its position, in which thelocking element 8 presses on the lengthenedlegs 43 of thepressure element 40 and therefore on thehead 20. By tightening theinner screw 15 therod 100 is then fixed independently of thehead 20. The locking effect caused by the cooperation of lockingelement 8 andinner screw 15 is otherwise as in the first and second embodiments. - The embodiments shown in FIGS. 5 to 7 differ from the third embodiment shown in
FIG. 4 in the type ofinner thread 7 of thelegs part 21′ and the correspondingouter thread 9 of thelocking element 8. Theinner thread 10 of thelocking element 8 and theouter thread 16 of the inner screw are constructed in these embodiments in each case as metric threads. - In the embodiment shown in
FIG. 5 theinner thread 29 of thelegs flank 29 a facing away from the open end encloses a negative angle a with a plane running perpendicular to the central axis M of the receiving part. Correspondingly,flank 9 b of theouter thread 9 of thelocking element 8 facing away from the open end in the screwed in state encloses a negative angle with a plane running horizontally to the screw axis S. The dimensions of the inner thread of the legs and the outer thread of the locking element are such that in the unloaded state there is a gap between theflanks 29 a and 29 b mentioned. - In operation the
legs element 8 is tightened, wherein theflanks 29 a and lob come to be on top of one another, so the legs are slightly pulled together. This gives rise to reliable blocking of thehead 20 via thepressure element 40. When the inner screw is screwed in, the lockingelement 8 splays out owing to the force component which is then acting radially outwards and therefore acts against the force pulling the legs together. The rod is fixed and simultaneously blocking of thelocking element 8 and legs against one another takes place. - The embodiment shown in
FIG. 6 differs from the embodiment shown inFIG. 5 in the construction of thethreads load flank 29 a or 19 b running horizontally to the central axis M or screw axis S. This also demonstrates the function according to the invention of the locking element. - The embodiment shown in
FIG. 7 differs from the embodiment shown inFIGS. 5 and 6 in that theinner thread 29 of the legs and theouter thread 9 of the locking element are constructed as a flat thread. This has twoflanks - A flank play is also provided in the thread forms shown in
FIGS. 6 and 7 in such a way that blocking of the locking element is possible after the inner screw has been screwed in. - In the embodiment shown in
FIG. 8 the lockingelement 80 is provided with a ring-shapedprojection 81 on its front end which has thenotches 13. Theslit 14 extends in this case, as in lockingelement 8, at least through the axial section in which theouter thread 9 is provided, but not through theprojection 81. Theslit 14 is further arranged in the circumferential direction in such a way that it extends into one of thenotches 13. - In operation, when the locking element is screwed in, the
projection 81 forms a stop which limits the force on the pressure element to a predetermined value. - Further embodiments of the invention emerge from the provision of the types of thread according to the embodiments according to FIGS. 5 to 6 and/or the locking element according to
FIG. 8 in a monoaxial screw according to the first embodiment according toFIG. 1 or the polyaxial screw according to the second embodiment according toFIG. 3 . - Instead of the above-described embodiments, in which the receiving part is connected to a bone screw, the receiving part can also be connected to a hook, as used in spinal column surgery for hooking in behind bone projections of the spinal column.
- In a further modification of the polyaxial embodiments, instead of the thread shank 1 or the hook, a bar or a rod-shaped element is provided, which has on both ends a head shaped like a segment of a sphere, which is connected to a receiving part of the kind described. In this way an element of this kind can be used as a connecting element between two
rods 100.
Claims (6)
1-17. (canceled)
18. A locking device for securing a rod-shaped element in a holding element connected to a shank capable of use in spinal column or accident surgery, said locking device comprising a locking element having a wall surrounding a substantially hollow cylindrical shape with a first end and a second end and with an axis of rotation, an outer thread, an inner thread, and a slit in the wall extending in the axial direction through the locking element from the first end to the second end.
19. The locking device according to claim 18 , further comprising an inner screw having an exterior thread that cooperates with the inner thread of the locking element.
20. The locking device according to claim 18 , wherein the inner thread comprises a metric thread.
21. The locking device according to claim 18 , wherein the outer thread comprises a metric thread.
22. The locking device according to claim 18 , wherein the outer thread comprises a structure selected from the group consisting of a horizontal load flank, a negative angle load flank, and a flat thread with two horizontal flanks.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/789,454 US20070260246A1 (en) | 2001-11-27 | 2007-04-23 | Locking device for securing a rod-shaped element in a holding element connected to a shank |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10157814A DE10157814B4 (en) | 2001-11-27 | 2001-11-27 | Closure device for securing a rod-shaped element in a holding element connected to a shaft |
DE10157814.8 | 2001-11-27 | ||
US10/306,060 US7223268B2 (en) | 2001-11-27 | 2002-11-27 | Locking device for securing a rod-shaped element in a holding element connected to a shank |
US11/789,454 US20070260246A1 (en) | 2001-11-27 | 2007-04-23 | Locking device for securing a rod-shaped element in a holding element connected to a shank |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/306,060 Division US7223268B2 (en) | 2001-11-27 | 2002-11-27 | Locking device for securing a rod-shaped element in a holding element connected to a shank |
Publications (1)
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US11/789,454 Abandoned US20070260246A1 (en) | 2001-11-27 | 2007-04-23 | Locking device for securing a rod-shaped element in a holding element connected to a shank |
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Also Published As
Publication number | Publication date |
---|---|
JP2003180707A (en) | 2003-07-02 |
US7223268B2 (en) | 2007-05-29 |
DE50211511D1 (en) | 2008-02-21 |
DE10157814A1 (en) | 2003-06-26 |
KR100764188B1 (en) | 2007-10-08 |
EP1316294A3 (en) | 2004-12-01 |
KR20030043722A (en) | 2003-06-02 |
EP1316294A2 (en) | 2003-06-04 |
JP4311930B2 (en) | 2009-08-12 |
EP1316294B1 (en) | 2008-01-09 |
DE10157814B4 (en) | 2004-12-02 |
US20030100904A1 (en) | 2003-05-29 |
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Legal Events
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