Implant for fixing two bone parts to be connected to each other

• US 20070276387A1
• Filed: 04/12/2007
• Published: 11/29/2007
• Est. Priority Date: 04/28/2006
• Status: Abandoned Application

• Current Assignee: Aesculap AG (B. Braun Holding GmbH & Co. KG)
• Original Assignee: Aesculap AG (B. Braun Holding GmbH & Co. KG)
• Inventors: Weisshaupt, Dieter, Morales, Pedro, Dworschak, Manfred, Lutze, Theodor
• Application Number:
  US11/787,200
• Publication Number:
  US 20070276387A1
• Time in Patent Office: Days
• US Class Current: 606/319
• CPC Class Codes: A61B 17/688 for reattaching pieces of the skull
• CPC Class Codes: A61B 17/823 for the sternum
• CPC Class Codes: A61B 17/8869 Tensioning devices
• CPC Class Codes: A61B 17/8872 Instruments for putting said fixation devices against or away from the bone A61B17/7074, A61B17/808 take precedence

Abstract

An implant for fixing two bone parts to be connected to each other is provided. The implant includes a first plate-shaped engaging element for engaging inner surfaces of the bone parts, at least two tensioning elements fixed on the engaging element and projecting transversely from it, and a second plate-shaped engaging element for engaging outer surfaces of the bone parts. The second engaging element can be tensioned with respect to the first engaging element by means of the tensioning elements brought through the interspace between the bone parts. To improve the ease of handling of the implant during tensioning, it is proposed that the tensioning elements are connected to each other at their end opposite from the first engaging element by a bridge.

Claims

1. Implant for fixing two bone parts to be connected to each other, comprising:

a first plate-shaped engaging element for engaging inner surfaces of the bone parts;

at least two tensioning elements fixed on said first engaging element and projecting transversely from it;

a second plate-shaped engaging element for engaging outer surfaces of the bone parts, which can be tensioned with respect to the first engaging element by means of the at least two tensioning elements extending through an interspace between the bone parts and passing through corresponding openings in the second engaging element; and

a bridge for connecting the at least two tensioning elements to each other at ends of the at least two tensioning elements opposite from the first engaging element.

2. Implant in accordance with claim 1, wherein the bridge is connected to the tensioning elements so as to be non-displaceable in a tensioning direction.

3. Implant in accordance with claim 1, wherein the tensioning elements are pins.

4. Implant in accordance with claim 2, wherein the tensioning elements are pins.

5. Implant in accordance with claim 2, wherein the bridge is connected to the tensioning elements in a non-displaceable manner by crimping.

6. Implant in accordance with claim 5, wherein the tensioning elements are inserted in bores in the bridge.

7. Implant in accordance with claim 1, wherein:

the bridge has an engaging surface for a tensioning device having two tensioning tools, one of said tensioning tools is adapted for engagement with the engaging surface and the other of said tensioning tools is adapted for engagement with an outer surface of the second engaging element; and

the tensioning device tensions the second engaging element with respect to the first engaging element when the tensioning tools are pushed apart.

8. Implant in accordance with claim 7, wherein:

the at least two tensioning elements comprise two tensioning elements; and

the engaging surface and the tensioning tool adapted for engaging said engaging surface are shaped in such a way that the tensioning tool is supported on the bridge midway between the two tensioning elements.

9. Implant in accordance with claim 8, wherein:

the tensioning tool adapted for engaging the second engaging element is adapted to be applied at two points on the second engaging element; and

the two points are disposed in a plane defined by said at least two tensioning elements at a distance from each other and away from a midpoint between the two tensioning elements.

10. Implant in accordance with claim 8, wherein the engaging surface of the bridge extends in an arcuate form.

11. Implant in accordance with claim 1, wherein:

each of said engaging elements carry fixing projections protruding therefrom and respectively pointing toward the other engaging element; and

said fixing projections are inclined in such a way that their spacing from corresponding fixing projections on an opposite side of the engaging element increases from the engaging element toward a free end of the fixing projections.

12. Implant in accordance with claim 1, wherein portions of said tensioning elements protruding beyond an outer surface of said second engaging element are cut off subsequent to said tensioning.

13. Implant in accordance with claim 12, wherein the portions of the tensioning elements protruding beyond an outer surface of said second engaging element and said bridge are cut off as a unit.

14. Implant in accordance with claim 12, wherein the portions of the tensioning elements protruding beyond an outer surface of said second engaging element are held on the bridge when said portions of the tensioning elements are cut off.

15. A method for fixing two bone parts to be connected to each other, comprising:

positioning a first plate-shaped engaging element against inner surfaces of the bone parts, with at least two tensioning elements fixed on said first engaging element and extending through an interspace between the bone parts;

positioning a second plate-shaped engaging element against outer surfaces of the bone parts with said at least two tensioning elements passing through openings in said second engaging element;

connecting the at least two tensioning elements to each other at ends of the at least two tensioning elements opposite from the first engaging element using a bridge; and

tensioning the second engaging element with respect to the first engaging element.

16. A method in accordance with claim 15, wherein the bridge is connected to the tensioning elements so as to be non-displaceable in a tensioning direction.

17. A method in accordance with claim 15, wherein the tensioning elements are pins.

18. A method in accordance with claim 16, wherein the tensioning elements are pins.

19. A method in accordance with claim 15, wherein said connecting comprises inserting the ends of the tensioning elements into bores in the bridge.

20. A method in accordance with claim 16, further comprising:

crimping the bridge to the ends of tensioning elements.

21. A method in accordance with claim 15, further comprising:

employing a tensioning de-vice having two tensioning tools for tensioning the second engaging element with respect to the first engaging element;

wherein;

the bridge has an engaging surface;

one of said tensioning tools is adapted for engagement with the engaging surface and the other of said tensioning tools is adapted for engagement with an outer surface of the second engaging element; and

the tensioning device tensions the second engaging element with respect to the first engaging element when the tensioning tools are pushed apart.

22. A method in accordance with claim 21, wherein:

said at least two tensioning elements comprise two tensioning elements; and

the engaging surface and the tensioning tool adapted for engaging said engaging surface are shaped in such a way that the tensioning tool is supported on the bridge midway between the two tensioning elements.

23. A method in accordance with claim 22, wherein:

the tensioning tool adapted for engaging the second engaging element is adapted to be applied at two points on the second engaging element; and

the two points are disposed in a plane defined by said at least two tensioning elements at a distance from each other and away from a midpoint between the two tensioning elements.

24. A method in accordance with claim 22, wherein the engaging surface of the bridge extends in an arcuate form.

25. A method in accordance with claim 15, wherein:

each of said engaging elements carry fixing projections protruding therefrom and respectively pointing toward the other engaging element; and

said fixing projections are inclined in such a way that their spacing from corresponding fixing projections on an opposite side of the engaging element increases from the engaging element toward a free end of the fixing projections.

26. A method in accordance with claim 15, further comprising:

cutting off portions of said tensioning elements protruding beyond an outer surface of said second engaging element subsequent to said tensioning.

27. A method in accordance with claim 26, wherein the portions of the tensioning elements protruding beyond an outer surface of said second engaging element and said bridge are cut off as a unit.

28. A method in accordance with claim 26, further comprising:

holding the portions of the tensioning elements protruding beyond an outer surface of said second engaging element on the bridge during said cutting.