Osteosynthesis auxiliary for the treatment of subtrochanteric, peritrochanteric, and femoral-neck fractures

• US 5,928,235 A
• Filed: 11/07/1997
• Issued: 07/27/1999
• Est. Priority Date: 06/01/1993
• Status: Expired due to Term

• Current Assignee: Endocare AG
• Original Assignee: Endocare AG
• Inventors: Friedl, Wilhelm
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): Reip, David O.
• Application Number:
  US08/966,077
• Time in Patent Office: 627 Days
• Field of Search: 606/62, 606/64, 606/65, 606/66, 606/67, 606/68, 606/89
• US Class Current: 606/64
• CPC Class Codes: A61B 17/1721 for applying pins along or parallel to the axis of the femoral neck
• CPC Class Codes: A61B 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/7233 with special means of locking the nail to the bone
• CPC Class Codes: A61B 17/725 with locking pins or screws of special form
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail

Abstract

Osteosynthesis auxiliary (10) for the treatment of subtrochanteric, peritrochanteric and femoral-neck fractures, with a locking nail (12) that can be introduced from the proximal end into the medullary space of a femur (11) and that comprises a distal section (15) having at least one oblong cross bore (13) to receive a distal locking element as well as a proximal section (14) having a slanted passageway (16), and with a femoral-neck part (19) that can be introduced from a lateral position through the slanted passageway (16) into the neck (17) and head (18) of the femur, wherein at least the section of the femoral-head part that can be anchored in the head (18) of the femur has a cross section that is not circular or rotationally symmetrical Preferably this section (34) has the shape of a double-T or I profile (35). At the end away from the head (18) of the femur the femoral-neck blade (19) also comprises a radially projecting collar (33) to limit the lateral extent to which the femoral-neck blade (19) can be inserted into the- passageway (16) through the locking nail (12).

Claims

1. A femoral neck part, for use with an intramedullary locking nail having a passageway transverse and slanted with respect to the longitudinal axis of said nail through which said part can be driven for the treatment of a femoral neck fracture, said part comprising:

a generally elongate body with a longitudinal axis and having a central bore extending along said axis for receiving a guide wire;

a distal blade portion and a proximal portion for engagement in said passageway;

said distal portion comprising a distal end having chisel-like surfaces to facilitate passage of the part into the neck of a femur, in use, and a plurality of blade surfaces extending substantially parallel to said axis of said body;

said proximal portion having a generally rectangular cross-section and, adjacent its proximal end, a projecting portion extending beyond said cross-section to limit the extent to which said part can be driven through said passageway, in use.

2. A femoral neck part as claimed in claim 1, wherein said projecting portion comprises a circumferential collar.

3. A femoral neck part as claimed in claim 1, further comprising an outer surface having at least one recess for receiving a stay pin for holding the neck part in place, in use.

4. A femoral neck part as claimed in claim 3, wherein said recess comprises a groove in the outer surface of said proximal portion extending substantially parallel to said longitudinal axis of said part.

5. A femoral neck part as claimed in claim 3, wherein said recess comprises a plurality of indentations spaced apart along the outer surface of the proximal portion.

6. A femoral neck part as claimed in claim 1, wherein said generally rectangular cross-section of said proximal portion is formed by a first pair of outer surfaces on opposite sides of said axis of said body and a second pair of surfaces on opposite sides of said axis, said first pair of surfaces being substantially flat and said second pair of surfaces each being curved.

7. A femoral neck part as claimed in claim 1, wherein said distal blade portion and said proximal portion each comprise about one-half of the length of said neck part.

8. A femoral neck part as claimed in claim 1, wherein said distal blade portion has a generally I-shaped cross-section.

9. A femoral neck part as claimed in claim 1, wherein said distal portion comprises a cross-member, extending along the longitudinal axis of said body and lying in a first plane, and a pair of wing members, separated by said cross-member and extending substantially parallel to said longitudinal axis and lying in planes substantially perpendicular to said first plane.

10. A femoral neck part as claimed in claim 9, wherein said wing members each have an inner surface, joined to said cross-member, and an outer surface, said inner and outer surfaces meeting to form said blade surfaces.

11. A femoral neck part as claimed in claim 10, wherein said outer surfaces are curved.

12. A femoral neck blade for placement in the neck of a femur for the treatment of fractures thereof, said blade comprising:

a distal blade portion and a proximal fixation portion;

said blade portion having a generally I-shaped cross-section to facilitate passage into the neck of a femur while maximizing resistance to twisting when in place therein;

said proximal portion having a nonrotationally symmetrical cross-section for mating with a correspondingly-shaped passage through a femoral locking nail, to that in use, said blade is held within said locking nail fixed against rotation, said proximal portion further comprising a projecting portion to limit the travel of said blade through said passageway, in use, said projecting portion comprising a circumferential collar.

13. A femoral neck blade as claimed in claim 12 , further comprising an outer surface having at least one recess for receiving a stay pin for holding the neck part in place, in use.

14. A femoral neck blade as claimed in claim 13, wherein said proximal portion has a longitudinal axis and said recess comprises a groove in the outer surface of said proximal portion extending substantially parallel to said axis.

15. A femoral neck blade as claimed in claim 13, wherein said recess comprises a plurality of indentations spaced apart along the surface of said proximal portion.

16. A femoral neck blade as claimed in claim 12, wherein said blade has a longitudinal axis and said proximal portion has a substantially rectangular cross-section formed by a first pair of surfaces on opposite sides of said axis and a second pair of surfaces on opposite sides of said axis, said first pair of surfaces being substantially flat and said second pair of surfaces each being curved.

17. A femoral neck blade as claimed in claim 12, wherein said distal blade portion and said proximal portion each comprise about one-half of the length of said neck part.

18. A femoral neck blade as claimed in claim 12, further comprising a bore extending along the longitudinal axis of said blade for receiving a guide wire.

19. A femoral neck blade as claimed in claim 12, wherein said distal portion comprises a cross-member, extending along the longitudinal axis of said blade and lying in a first plane, and a pair of wing members, separated by said cross-member and extending substantially parallel to said longitudinal axis and lying in planes substantially perpendicular to said first plane.

20. A femoral neck blade as claimed in claim 19, wherein said wing members each have an inner surface, joined to said cross-member, and an outer surface, said inner and outer surfaces meeting to form blade surfaces.

22. A femoral neck blade as claimed in claim 12, wherein blade portion has a leading edge formed into chisel-like surfaces.

21. A femoral neck blade as claimed in claim 21, wherein said outer surfaces are curved.

23. A method of treating femoral fractures, which comprises the steps of:

boring a hole in the femur;

aligning a femoral neck part with said hole, said femoral neck part comprising a generally elongate body with a longitudinal axis, a distal blade portion and a proximal portion, said distal portion comprising a distal end having chisel-like surfaces to facilitate passage of the part into the femur and a plurality of blade surfaces extending substantially parallel to said axis of said body, said proximal portion having a generally rectangular cross-section and, adjacent its proximal end, a projecting portion extending beyond said cross-section; and

driving said femoral neck pat into said hole, said projecting portion limiting the extent to which said part enters said hole.

24. A method as claimed in claim 23, wherein said projecting portion comprises a circumferential collar.

25. A method as claimed in claim 23, wherein said part comprises an outer surface having at least one recess and said method comprises the further step of engaging said recess with a stay pin to hold the neck part in place.

26. A method as claimed in claim 25, wherein said recess comprises a groove in the outer surface of said proximal portion extending substantially parallel to said longitudinal axis of said part.

27. A method as claimed in claim 25, wherein said recess comprises a plurality of indentations spaced apart along the outer surface of the proximal portion and said method comprises selecting an indentation for engagement of said stay pin.

28. A method as claimed in claim 23, wherein generally rectangular cross-section of said proximal portion is formed by a first pair of outer surfaces on opposite sides of said axis of said body and a second pair of surfaces on opposite sides of said axis, said first pair of surfaces being substantially flat and said second pair of surfaces each being curved.

29. A method as claimed in claim 23, wherein said distal blade portion and said proximal portion each comprise about one-half of the length of said neck part.

30. A method as claimed in claim 23, wherein said distal blade portion has a generally I-shaped cross-section.

31. A method as claimed in claim 23, wherein said distal portion comprises a cross-member, extending along the longitudinal axis of said body and lying in a first plane, and a pair of wing members, separated by said cross-member and extending substantially parallel to said longitudinal axis and lying in planes substantially perpendicular to said first plane.

32. A method as claimed in claim 31, wherein said wing members each have an inner surface, joined to said cross-member, and an outer surface, said inner and outer surfaces meeting to form said blade surfaces.

33. A method as claimed in claim 32, wherein said outer surfaces are curved.

34. A method of treating femoral fractures, which comprises the steps of:

boring a hole in the femur;

aligning a femoral neck blade with said hole, said blade comprising a distal blade portion and a proximal fixation portion, said blade portion having a generally I-shaped cross-section, said proximal portion having a nonrotationally symmetrical cross-section, said proximal portion comprising a projecting portion, said projecting portion comprising a circumferential collar; and

driving said femoral neck blade into said hole, said projecting portion limiting the extent to which said blade enters said hole and said I-shaped cross section facilitating passage into the femur while maximizing resistance of the blade to twisting therein.

35. A method as claimed in claim 34, wherein said blade further comprises an outer surface having at least one recess and said method comprises the further step of engaging a stay pin in said recess to hold the neck blade in place.

36. A method as claimed in claim 35, wherein said proximal portion has a longitudinal axis and said recess comprises a groove in the outer surface of said proximal portion extending substantially parallel to said axis.

37. A method as claimed in claim 35, wherein said recess comprises a plurality of indentations spaced apart along the surface of said proximal portion and sad method comprises selecting an indentation for engagement of said stay pin.

38. A method as claimed in claim 34, wherein said blade has a longitudinal axis and said proximal portion has a substantially rectangular cross-section formed by a fire pair of surfaces on opposite sides of said axis and a second pair of surfaces on opposite sides of said axis, said first pair of surfaces being substantially flat and said second pair of surfaces each being curved.

39. A method as claimed in claim 34, wherein said distal blade portion and said proximal portion each comprise about one-half of the length of said neck part.

40. A method as claimed in claim 34, wherein said blade further comprises a bore extending along the longitudinal axis of said blade for receiving a guide wire.

41. A method as claimed in claim 34, wherein said distal portion comprises a cross-member, extending along the longitudinal axis of said blade and lying in a first plane, and a pair of wing members, separated by said cross-member and extending substantially parallel to said longitudinal axis and lying in planes substantially perpendicular to said first plane.

42. A method as claimed in claim 41, wherein said wing members each have an inner surface, joined to said cross-member, and an outer surface, said inner and outer surfaces meeting to form blade surfaces.

43. A method as claimed in claim 42, wherein said outer surfaces are curved.

44. A method as claimed in claim 34, wherein blade portion has a leading edge formed into chisel-like surfaces.