Claims
- 1. An osteosynthetic anchoring member for fixating bones, comprising:
a longitudinal shaft extending along a longitudinal axis having a front shaft portion and a rear shaft portion, the front shaft portion insertable into a bone and comprising anchoring means for fixating the shaft in the bone and the rear shaft portion comprising anti-rotation means for permitting the rear shaft portion to be received in an implantable bone plate or a connecting member and to be secured against rotating about the longitudinal axis, wherein
A) the anchoring means are capable of being extended orthogonally with respect to the longitudinal axis of the shaft, and B) the rear shaft portion comprises tension means for extending anchoring means to enable the anchoring member to be fixated within the bone.
- 2. The anchoring member of claim 1, wherein the anchoring means may be bent outward in an arch-shaped manner parallel to the longitudinal axis.
- 3. The anchoring member of claim 1, wherein the shaft is cylindrical and has a diameter D.
- 4. The anchoring member of claim 3, wherein the anchoring means may be bent outward to define a diameter Dmax, wherein diameter Dmax is greater than diameter D.
- 5. The anchoring member of claim 1, wherein the anchoring means are resiliently bendable in the radial outward direction.
- 6. The anchoring member of claim 1, wherein the anchoring means are plastic deformably bendable in the radial outward direction.
- 7. The anchoring member of claim 4, wherein the ratio of diameter Dmax to diameter D is between 1.2 and 3.0.
- 8. The anchoring member of claim 7, wherein the ratio of diameter Dmax to diameter D is between 1.5 and 2.5.
- 9. The anchoring member of claim 1, wherein the anchoring means is bendable outwardly over a length L and the length L is between 10 mm and 60 mm.
- 10. The anchoring member of claim 1, wherein the anchoring means comprises anchoring wires arranged parallel to the longitudinal axis and having a diameter d, a rear end adjacent the tension means and a front end positioned longitudinally opposite thereof, the front and rear ends being mounted within the shaft, and the anchoring wires bendable outward in an archshaped manner orthogonal to the longitudinal axis when the tension means is actuated.
- 11. The anchoring member of claim 10, wherein the anchoring member comprises between three and six anchoring wires.
- 12. The anchoring member of claim 10, wherein the diameter d is between 0.5 mm and 2.5 mm.
- 13. The anchoring member of claim 12, wherein the diameter d is between 1 mm and 1.5 mm.
- 14. The anchoring member of claim 10, wherein the front and rear ends are ball-shaped, with the ball diameter approximately equal to d.
- 15. The anchoring member of claim 1, wherein the tension means comprises, in coaxial alignment with the longitudinal axis, a spindle with an external screw thread and a threaded sleeve with an internal screw thread corresponding to the external screw thread.
- 16. The anchoring member of claim 15, wherein the shaft comprises a bore extending concentrically to the longitudinal axis within which the threaded sleeve and the spindle are arranged coaxially in the rear shaft portion, and the threaded sleeve is fixed engagement with the bore.
- 17. The anchoring member of claim 15, wherein
A) the spindle comprises a bearing member with an annular groove positioned adjacent the front shaft portion and displaceable within the bore parallel to the longitudinal axis, B) the spindle is connected to the bearing member and secured against axial displacement while being capable of rotating about the longitudinal axis; C) the lateral area of the bore formed in the shaft comprises a groove extending parallel to the longitudinal axis; D) the bearing member comprises a radially projecting finger which engages with the groove, and E) the annular groove is arranged in a cross-section extending vertically to the longitudinal axis receives the rear ends of the anchoring wires.
- 18. The anchoring member of claim 17, wherein the annular groove has a circular cross-section.
- 19. The anchoring member of claim 15, wherein the rear shaft portion has a rear shaft end longitudinally opposite to the front shaft portion, and the spindle has a rear spindle end which corresponds to the rear shaft end and comprises means for receiving a screw driver.
- 20. The anchoring member of claim 15, wherein the rear shaft portion has a rear shaft end longitudinally opposite to the front shaft portion, and the spindle has a rear spindle end which corresponds to the rear shaft end and comprises a bore extending from the rear spindle end concentrically to the longitudinal axis and including an internal screw thread for receiving a compression bone screw.
- 21. The anchoring member of claim 1, wherein the front shaft portion has a front shaft end longitudinally opposite to the rear shaft portion and the front shaft end comprises a plug member which is inserted into the bore and has a spherically shaped portion adjacent the front shaft end.
- 22. The anchoring member of claim 21, wherein the plug member includes an insertion portion to be inserted into the bore and the insertion portion comprises an annular groove, the annular groove arranged generally perpendicular to the longitudinal axis and for receiving the front ends of the anchoring wires.
- 23. The anchoring member of claim 22, wherein the annular groove has a circular cross-section.
- 24. The anchoring member of claim 1, wherein the shaft has a prismatic shape.
- 25. The anchoring member of claim 1, wherein the rear shaft end includes means for receiving a screw driver.
- 26. A fixation device for fixating fractured femoral heads including an anchoring member according to claim 1, wherein the fixation device comprises:
A) the anchoring member to be fixed within a fractured femoral head; B) a plate positioned adjacent the main part of the femur and including a sleeve extending at an angle with respect to the plate in which the rear shaft portion of the anchoring member may be received and wherein it is displaceable coaxially to the longitudinal axis; C) a compression bone screw to be screwed into the internal screw thread of the spindle, the head of which is supported by the shoulder surface of the sleeve; and D) an anti-rotation means located between the anchoring member and the sleeve.
- 27. The fixation device of claim 26, wherein the fixation device further comprises bone screws for fixing the plate to the femur.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation of the U.S. National Stage designation of copending International Patent Application PCT/CH00/00207, filed Apr. 10, 2000. The entire content of this application is expressly incorporated herein by reference thereto.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/CH00/00207 |
Apr 2000 |
US |
Child |
10267872 |
Oct 2002 |
US |