Source: http://www.google.ca/patents/US20050267472
Timestamp: 2017-12-18 14:26:33
Document Index: 647235171

Matched Legal Cases: ['art;\n16', 'art 5', 'art 5', 'art 150', 'art 150', 'art 150', 'art 150', 'art 51', 'art 150', 'art 51', 'art 5', 'art 150', 'art 150', 'art 150', 'art 51', 'art 150', 'art 51', 'art 151', 'art 150', 'art 150', 'art 150']

Patent US20050267472 - Bone anchoring device for stabilising bone segments and seat part of a bone ... - Google Patents
A bone anchoring device for stabilizing bone segments is provided, with a bone anchoring element which has a shank part and a head, a receiver part for articulated connection of the bone anchoring element to a rod, wherein the receiver part has a first end and a second end opposite this, a bore extending...http://www.google.ca/patents/US20050267472?utm_source=gb-gplus-sharePatent US20050267472 - Bone anchoring device for stabilising bone segments and seat part of a bone anchoring device
Publication number US20050267472 A1
Application number US 11/159,003
Also published as DE602005010990D1, EP1736109A1, EP1736109B1, US7530992
Publication number 11159003, 159003, US 2005/0267472 A1, US 2005/267472 A1, US 20050267472 A1, US 20050267472A1, US 2005267472 A1, US 2005267472A1, US-A1-20050267472, US-A1-2005267472, US2005/0267472A1, US2005/267472A1, US20050267472 A1, US20050267472A1, US2005267472 A1, US2005267472A1
Patent Citations (13), Referenced by (127), Classifications (11), Legal Events (6)
Bone anchoring device for stabilising bone segments and seat part of a bone anchoring device
US 20050267472 A1
A bone anchoring device for stabilizing bone segments is provided, with a bone anchoring element which has a shank part and a head, a receiver part for articulated connection of the bone anchoring element to a rod, wherein the receiver part has a first end and a second end opposite this, a bore extending from the first end in the direction of the second end for guiding through the shank part, adjacent to the bore a section for receiving the head, an opening extending from the second end in the direction of the first end for inserting the shank part with head and a recess extending from the second end in the direction of the first end for forming a channel for receiving the rod, forming two open legs, wherein the receiver part has two slit-shaped recesses extending at the front from the floor of the channel in the direction of the first end.
adjacent to the bore, a section for receiving the head;
9. The receiver part in accord with claim 8, wherein the outer thread of the two open legs and the inner thread of the nut each comprise a cooperating portion whereby a pressure force an be exerted on the two open legs in a direction perpendicular to the slit-shaped recess.
10. The receiver part in accord with claim 8, wherein the nut is structured and arranged in the form of a cap having a central bore and a cylindrical projection surrounding the central bore and having an inner thread for receiving the rod fixing screw.
a first end and a second end in the direction of the second end for guiding through the shank part;
16. The bone anchoring device in accord with claim 12, wherein the two open legs haven an outer thread and the device that cooperates with the two open legs comprises a nut with an inner thread that cooperates with the outer thread on the two open legs.
20. The receiver part in accord with claim 18, wherein the nut is structured and arranged in the form of a cap having a central bore and a cylindrical projection surrounding the central bore and having an inner thread for receiving the rod fixing screw.
21. A receiver part for articulated connection of a bone anchoring element with a rod having a diameter, the bone anchoring element comprising a shank part and a head, a receiver part comprising:
two slit-shaped recesses extending from the first end in the direction of the second end, said slit-shaped recesses being provided on opposite sides of the receiver part in the direction of the longitudinal axis of said channel;
wherein the head is locked in its position by the action of a force which tends to move apart said legs.
22. The receiver part of claim 21, further comprising a device that cooperates with the two open legs to exert a force on said legs which tends to move apart said legs.
23. The receiver part of claim 22, wherein said legs comprise an inner thread and said device is an inner screw to be screwed between said legs.
24. The receiver part of claim 21, wherein said section to receive said head has a shape corresponding to the shape of head to be received.
25. The receiver part of claim 21, wherein the length of said slit-shaped recesses in the direction of the first end to the second end is dimensioned such that the head can be clamped in the section for receiving the head.
26. The receiver part of claim 21 further comprising one or more additional slit-shaped recesses extending from the second end in the direction of the first end.
27. The receiver part of claim 21, wherein the width of the channel corresponds to the diameter of the rod to be inserted.
28. A bone anchoring device for stabilizing bone segments, the device comprising:
two slit-shaped recesses extending from the first end in the direction of the second end and being located on opposite sides in the direction of the longitudinal axis of said channel;
29. The receiver part of claim 28, further comprising a device that cooperates with the two open legs to exert a force on said legs which tends to move apart said legs.
30. The receiver part of claim 29, wherein said legs comprise an inner thread and said device is an inner screw to be screwed between said legs.
31. The receiver part of claim 28, wherein said section to receive said head has a shape corresponding to the shape of the head to be received.
32. The receiver part of claim 28, wherein the length of said slit-shaped recesses in the direction of the first end to the second end is dimensioned such that the head can be clamped in the section for receiving the head.
33. The receiver part of claim 28 further comprising one or more additional slit-shaped recesses extending from the second end in the direction of the first end.
34. The receiver part of claim 28, wherein the width of the channel corresponds to or is slightly smaller than the diameter of the rod to be inserted.
The invention relates to a bone anchoring device for stabilising bone segments with a bone anchoring element and a seat part (receiver part) for articulated connection of the bone anchoring element to a rod and a receiver part of a bone anchoring device of this kind according to the preambles of patent claims 1 and 2.
From DE 37 11 013 C1 a pedicle screw for stabilising spinal column segments is known, in which the screw element is articulatedly connected to a receiver part. The receiver part comprises two halves surrounding the head of the screw element and a guard ring holding them together. The receiver part further has receiving slits for inserting a threaded rod. Locking the head in the receiver part and fixing the threaded rod is done by nut-shaped fixing screws screwed on to the threaded rod on both sides of the receiver part, which fixing screws act laterally on the receiver part.
A bone anchoring device according to the preamble of patent claim 2 and a receiver part according to the preamble of patent claim 1 are known form DE 39 23 996 C2. In the known device, to fix the angle of the bone screw relative to the receiver part, a pressure element acting on the head of the bone screw is provided. Fixing the rod, constructed as a threaded rod, takes place by means of nuts screwed on to the rod, which act laterally on the receiver part. In the assembled state a force is exerted on the head in the axial direction of the receiver part via the pressure element in such a way that the head is locked in the receiver part.
A bone anchoring device according to the preamble of patent claim 2 and a receiver part according to the preamble of patent claim 1 in which there is a pressure element for fixing the head are also known from DE 43 07 576 C1. Fixing the head and rod takes place by means of a fixing screw which can be screwed into the receiver part and a lock nut screwed on to the receiver part, which exert a force on the pressure element in the axial direction of the receiver part.
In the U.S. Pat. No. 5,728,098, a bone anchoring device according to the preamble of claim 2 and a receiver part according to the preamble of claim 1 are described. Head and rod are fixed separately by two rings of memory shape alloy. For this purpose, the receiver part has a pair of opposite upper slots and a pair of opposite lower slots. Receiver part, screw and lower ring are pre-assembled loosely, and in this state, the bone anchoring device is screwed into the bone. Thereafter the rod is inserted and the upper ring is mounted. By the temperature of the body the two memory shape alloy rings contract. Thus, head and rod can be fixed separately in the receiver part by the two corresponding rings.
The object is achieved by a receiver part according to patent claim 1 and a bone anchoring device according to patent claim 2. Further developments of the invention are cited in the subordinate claims.
FIG. 10 shows a side view of a modified bone anchoring device.
FIG. 11 shows a perspective view of the modified bone anchoring device of FIG. 10.
FIG. 12 shows a partially sectional view of the bone anchoring device of FIG. 10 in a state in which the inner screw is not yet fully tightened.
FIG. 13 is a schematic representation of the fixed state of the bone anchoring device according to FIG. 12 with the inner screw fully tightened.
FIG. 14 is a perspective view of the receiver part of FIGS. 10 and 11.
The receiver part 5 further has two slit-shaped recesses 15 opposite one another and extending at the front from the floor of the channel in the direction towards the first end 6. The recesses extend to a predetermined depth into section 10 shaped like a segment of a sphere. The width of the slit-shaped recesses 15 is dimensioned in such a way that the open legs 13, 14 are elastically movable in respect of one another to a preset amount.
In FIGS. 6 and 7 a modified embodiment of the bone anchoring device according to FIGS. 1 to 4 is shown which differs from the former in the holder of the head 3 in the receiver part 5.
Identical parts are therefore described by the same reference numerals.
FIGS. 10 to 14 show a modified bone anchoring device. Parts which are identical to the embodiments shown in FIGS. 1 to 9 are characterized with the same reference numerals. The bone anchoring device includes the screw element 1 with a thread section 2 with a bone thread and a spherical segment-shaped head 3. As in the previous embodiments the head 3 has a recess 4 for bringing into engagement with a screw driver.
The receiver part 150 has a first end 6 and a second end 7 opposite to the first end. In an assembled state the first end 6 is directed towards the screw element 1. As shown in FIG. 12, the receiver part has—as in the previous embodiments—a coaxial bore 8, the diameter of which is larger than that of the thread section 2 and smaller than that of the head 3. Further, the receiver part 150 has a coaxial second bore 9 which is open at the second end 7. The diameter of the second bore 9 is large enough to allow the screw element 1 to be inserted through the open end. Adjacent to the first bore 8 a coaxial spherically-shaped section 10 is provided which has a radius substantially identical to the radius of the section of the head 3 when the bone anchoring device is assembled.
The receiver part 150 further has a recess 11, extending from the second end 7 in the direction of the first end 6. The recess 11 is substantially U-shaped and forms a channel with a bottom 111 into which the rod 12 can be inserted. The width of the channel is just as large that the rod can be inserted without jamming and fits into the channel when it is not fixed. By the recess 11 two legs 13, 14, which are open towards the second end 7, are formed. The legs 13, 14 comprise an inner thread 160 to allow an inner screw 170 to be screwed between the legs 13, 14.
The receiver part 150 has two slit-shaped recesses 151 which are open at the first end 6 and extend in the direction towards the second end 7 and which are located on opposite sides in the direction of the longitudinal axis of the channel. The slit-shaped recesses 151 end at a distance from the bottom 111 of the channel. The length and the width of the slit-shaped recesses 151 are dimensioned such that a lower part 51 of the receiver part 150 has a certain elasticity to be able to clamp the head 3 of the screw element 1 when a force is exerted which presses together the two portions of the lower part 51 of the receiver part 5 which are separated by the slit-shaped recesses.
In operation the screw element 1 is inserted from the second end 7 until the head 3 rests against the section 10 of the receiver part 150. In this state the screw element is pivotably held in the receiver part and the screw element can be screwed into the bone. Thereafter the angular position of the screw element 1 with respect to the receiver part 150 is adjusted and the rod 12 is inserted into the channel. In the first state as shown in FIG. 12 when the inner screw 170 is not yet fully tightened, there is still a possibility to adjust the position of the receiver part 150 with respect to the rod 12 or with respect to the head 3. When further screwing in the inner screw 170 towards the rod 12 and finally tightening the inner screw 170, the inner screw 170 presses onto the rod 12 and fixes the rod 12 in its position. During tightening of the inner screw 170 the inner screw cooperates with the inner thread 160 of the legs 13, 14 in such a way that a force FS is generated which tends to move apart the legs 13, 14 from each other. Simultaneously, because of the elasticity of the lower part 51 of the receiver part 150 due to the presence of the slit-shaped recesses 151, the lower part 51 of the receiver part 151 is compressed so that a pressing force FP is generated which clamps the head 3 to lock the head in its position. FIG. 13 schematically illustrates the moving apart of the legs. The forces required to clamp the head are not as big that the inner screw is loosened due to splaying of the legs. In practice, the inner screw remains fixed between the legs.
With the construction as described above it is possible to simultaneously fix the rod and to lock the head in its position without using a separate compression member or an outer nut. Therefore, the bone anchoring device is simple and compact.
Further modifications are possible. Instead of only two slits there may be several slits in a circumferential direction of the lower part of the receiver part 150. A sufficient number of slits should be provided to ensure secure clamping. The number of slits is selected according to the required clamping force. The shape of the section 10 against which the head 3 rests, can be other than spherical.
Instead of inserting the screw element 1 through the opening on top of the receiver part 150, it is also possible to design the receiver part in such a way that the screw element can be inserted from the lower opening 8. In this case the dimensions of the opening and the number of the slits have to be adapted such that it is possible to snap the receiver part 150 onto the head 3 of the screw element 1.
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U.S. Classification 606/308, 606/305, 606/270, 606/278, 606/266
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BIEDERMANN, LUTZ;HARMS, JÜRGEN;REEL/FRAME:016319/0468;SIGNING DATES FROM 20050711 TO 20050712