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1. US20130338712 - DEVICE FOR CORRECTING SCOLIOSIS AND CONTROLLING VERTEBRAL ARTHRODESIS

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Claims

1. A device ( 1) for correcting scoliosis, comprising at least:
a pair of distraction rods ( 2, 3); and
a distraction rod linking member ( 4) provided with means ( 8, 18) for guiding each of the rods relative to each other inside said linking member;
characterized in that it comprises, for each distraction rod:
at least one suspension member ( 6) for the distraction rods ( 2, 3) that is capable of providing flexibility and exerting a longitudinal pre-load on the distraction rods ( 2, 3); and
a structure for cushioning and locking the distraction rods in translation in the linking member, said structure being active only when compressive forces are applied by the spine of a patient to the distraction rods ( 2, 3) so as to absorb and oppose said compressive forces and augment the comfort of the patient, thereby preventing arthrodesis of the vertebrae of the patient's spine.
2. A scoliosis correction device according to claim 1, characterized in that the linking member ( 4) comprises a casing ( 7) inside which at least one said suspension member ( 6) for each rod is housed and the rods are inserted into said casing and each cooperates with a said suspension member.
3. A scoliosis correction device according to claim 1, characterized in that the distraction rods ( 2, 3) are introduced into and extend along two parallel axes (X 1, X 2) in the linking member ( 4).
4. A scoliosis correction device according to claim 3, characterized in that the structure for cushioning and locking the correction device comprises, for each distraction rod ( 2, 3), a ring ( 8) for adjusting the positions of the rods ( 2, 3) relative to the linking member ( 4), each said ring ( 8) being mounted coaxially and being slidably movable on each said rod, and cooperating with at least one means ( 9) for locking against sliding on the rods in at least one direction.
5. A scoliosis correction device according to claim 4, characterized in that each adjusting ring ( 8) bears on at least one said suspension member ( 6) mounted between an internal wall of the linking member ( 4) and said adjusting ring ( 8).
6. A scoliosis correction device according to claim 4, characterized in that the locking means ( 9) comprise a screw ( 10) inserted into an aperture formed in the adjusting ring.
7. A scoliosis correction device according to claim 4, characterized in that the locking means ( 9) comprise a toothed washer ( 11).
8. A scoliosis correction device according to claim 4, characterized in that the locking means ( 9) consist of an assembly comprising a split ring ( 12) and a disk clamp ( 13) slidably mounted on the distraction rod ( 2, 3) inside an at least partially conical chamber ( 14) formed in the adjusting ring ( 8), such that the disk clamp ( 13) presses on the split ring ( 12) in a conical section ( 15) of the chamber.
9. A scoliosis correction device according to claim 8, characterized in that the disk clamp ( 13) cooperates with a return means ( 16) housed in a non-conical section ( 17) of the chamber ( 14) formed in the adjusting ring ( 8).
10. A scoliosis correction device according to claim 4, characterized in that the locking means ( 9) consist of an assembly comprising rollers ( 12′) and a disk clamp ( 13′) slidably mounted on the distraction rod ( 2, 3) inside an at least partially conical chamber ( 14′) formed in the adjusting ring ( 8), such that the disk clamp ( 13′) presses on the rollers ( 12′) in a conical section of the chamber.
11. A scoliosis correction device according to claim 10, characterized in that the disk clamp ( 13′) cooperates with a return means ( 16′) positioned between the disk clamp ( 13′) and an internal wall of the chamber ( 14′) perpendicular to the axis (X 1, X 2) of the rod ( 2, 3).
12. A scoliosis correction device according to claim 9, characterized in that the return means of the disk clamp comprise a helical spring ( 16, 16′) mounted coaxially with the distraction rod ( 2, 3) in said chamber ( 14, 14′) of each ring ( 8).
13. A scoliosis correction device according to claim 1, characterized in that the cushioning and locking structure comprises an over-center device ( 18) for locking the distraction rods relative to the linking member.
14. A scoliosis correction device according to claim 10, characterized in that the device ( 18) for locking the distraction rods comprises two keepers ( 19) that are movable in translation in the linking member ( 4) in a direction (X 3) parallel to the axes (X 1, X 2) in the linking member, said keepers being disposed either side of the suspension member ( 6) and each bearing both on said suspension member and also on a distraction rod ( 2, 3) in order to lock it against sliding in a first direction (F 3, F 4) relative to the linking member ( 4) by an over-center effect while being capable of allowing it to slide freely in a second direction (F 1, F 2) opposite to the first during stages of growth of a spine instrumented with the correction device.
15. A scoliosis correction device according to claim 11, characterized in that each keeper ( 19) of the locking device comprises a cam ( 20) pivoting on a support body ( 21) bearing on the suspension member ( 6), the cam cooperating with a resilient return element ( 22) that is attached to the support body ( 21) and that constrains said cam to bear on its cam surface ( 23) against a distraction rod.