Apparatus for reducing a fracture

• US 5,122,146 A
• Filed: 02/04/1988
• Issued: 06/16/1992
• Est. Priority Date: 02/04/1988
• Status: Expired due to Term

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Pfizer Hospital Products Group, Inc. (Pfizer Inc.)
• Inventors: Mears, Dana C., Chapman, Michael W., Edwards, Charles C.
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): ROONEY, KEVIN
• Application Number:
  US07/152,172
• Time in Patent Office: 1,594 Days
• Field of Search: 128/92 R, 128/92 VD, 128/92 VK, 128/92 V, 128/92 VT, 128/92 VW, 128/303 R, 128/361, 128/774, 33/143 C, 33/511, 33/512, 33/832, 33/836, 606/96, 606/99, 606/102, 606/104
• US Class Current: 606/102
• CPC Class Codes: A61B 17/1717 for applying intramedullary nails or pins
• 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 17/921 for intramedullary devices
• CPC Class Codes: A61B 90/06 Measuring instruments not otherwise provided for
• CPC Class Codes: B25D 1/16 having the impacting head in the form of a sleeve slidable on a shaft, e.g. hammers for driving a valve or draw-off tube into a barrel

Abstract

Fracture reduction tool is disclosed for use with a guide wire for reducing a bone fracture. The guide wire is of a uniform diameter and has a beaded end for placement into the medullary canal. The tool includes an elongated hollow shaft which can be passed into the medullary canal of the fractured bone through an entry hole prepared in the bone. The shaft has a bore along its length through which the guide wire can selectively pass. The shaft and/or the guide wire can be manipulated into and within the respective medullary canal portions of the fractured bone by translational and/or rotational movements so as to reduce the fracture. The tool also includes a measurement sleeve which moves over the shaft and provides a determination of the length of a nail to be inserted into the medullary canal of the reduced bone. A handle for the proximal end of the shaft allows for ease in manipulation of the shaft and guide wire. Locking mechanisms to secure the measurement sleeve and guide wire in position relative to the shaft are also provided.

A method of operation with the fracture reduction tool of the present invention is also disclosed.

Claims

1. Apparatus for reducing a fractured bone having a medullary canal, comprising:

a. shaft means having distal and proximal ends and being configured and dimensioned for passage and entry of its distal end into and within the medullary canal of the fractured bone through a suitably sized aperture for manipulating into and within the medullary canal by translation and rotational movements so as to reduce the fractured bone by repositioning the various bone fragments in their proper relative arrangement, said shaft means having graduations along a portion thereof and a bore along its length; and

b. measurement sleeve means configured and dimensioned for movement over at least the graduation portion of said shaft means outside of the medullary canal, so as to permit determination of the length of a nail to be inserted into the medullary canal of the reduced bone for fixating the fracture, said measurement sleeve means comprising a tubular sleeve movable at least along a portion of said shaft, said tubular sleeve having a body portion with extended flange ends.

2. Apparatus of claim 1 wherein said shaft means is an elongated shaft of a generally uniform diameter along its length.

3. Apparatus of claim 2 wherein said shaft is beveled at its distal end.

4. Apparatus of claim 2 wherein said shaft has graduations along a portion thereof and which cooperate with said measurement means for determination of the nail length.

8. Apparatus of claim 4 wherein said measurement means comprises a tubular sleeve movable at least along the portion of said shaft having said graduations.

9. Apparatus of claim 8 wherein said tubular sleeve includes a window so as to permit viewing of said graduations on said shaft under said window.

10. Apparatus of claim 9 wherein said tubular sleeve has an arrow indicator positioned generally midway of said window so as to aid in measurement of the length of the nail to be inserted.

11. Apparatus of claim 10 further comprising means for selectively locking said measurement means in a predetermined position on said shaft.

12. Apparatus of claim 11 wherein said tubular sleeve further comprises a passageway communicating with the outer surface of said shaft and said measurement locking means comprises a screw dimensioned and configured for cooperative engagement with said passageway so that said screw can be advanced into said passageway and thereupon contact said outer surface so as to selectively lock said tubular sleeve in position on said shaft.

13. Apparatus of claim 2 further comprising handle means coupled to the proximal end of said shaft for aid in manipulating said shaft into and within the medullary canal, said handle means having a bore along its length aligned coaxially with said bore of said shaft.

14. Apparatus of claim 13 wherein said handle means comprises an elongated handle body which is open at one end to receive the proximal end of said shaft therein.

15. Apparatus of claim 14 further comprising chuck means for selectively securing said shaft to said handle body.

16. Apparatus of claim 15 wherein said chuck means comprises threads positioned adjacent said open end of said handle body and a collar having a bore dimensioned and configured so as to permit movement of said collar along at least the proximal end of said shaft, said collar having threads within its bore corresponding to said threads on said handle body so as to permit cooperative engagement of said first and said threads such that said open end of said handle body is selectively pressed by said collar into contact with said shaft for securement thereof.

17. Apparatus of claim 14 wherein said handle means further comprises a generally tubular handle grip positioned about a portion of said elongated handle body.

18. Apparatus of claim 17 wherein said handle means further comprises a handle rod positioned on the distal end of said handle body and extending transversely to said handle bore.

5. Apparatus of claim 5 wherein said graduations are evenly spaced apart.

6. Apparatus of claim 5 wherein said graduations are in the range of thirty through forty-eight centimeters.

7. Apparatus of claim 6 wherein said graduations are spaced in one centimeter increments.

19. Apparatus for use with a guide wire for reducing a fractured bone having a medullary canal, comprising:

a. shaft means having distal and proximal ends and being configured and dimensioned for passage and entry of its distal end into and within the medullary canal of the fractured bone through a suitably sized aperture for manipulating into and within the medullary canal by translational and rotational movements so as to reduce the fractured bone by repositioning the various bone fragments in their proper relative arrangement, said shaft means having graduations along a portion thereof and a bore along its length, said bore having a diameter greater than the general diameter of the guide wire to allow selective passage of the guide wire through said bore; and

b. measurement sleeve means configured and dimensioned for movement over at least the graduation portion of said shaft means outside of the medullary canal, so as to permit determination of the length of a nail to be inserted into the medullary canal of the reduced bone for fixating the fracture, said measurement sleeve means comprising a tubular sleeve movable at least along a portion of said shaft, said tubular sleeve having a body portion with extended flange ends.

20. Apparatus of claim 19 further comprising handle means coupled to the proximal end of said shaft for aid in manipulating said shaft means into and within the medullary canal, said handle means having a bore along its length aligned coaxially with said bore of said shaft, said handle bore having a diameter greater than the general diameter of the guide wire to allow selective passage of the guide wire through said handle bore.

21. Apparatus of claim 20 further comprising means for selectively locking the guide wire within said handle bore in a predetermined position relative to said shaft means.

22. Apparatus for use with a guide wire for reducing a fractured femur, the guide wire being of a generally uniform diameter and having an enlarged distal end portion for placement into the medullary canal of the fractured femur, comprising:

a. shaft means having distal and proximal ends and being configured and dimensioned for passage and entry of its distal end into and within the medullary canal of the fractured femur through a suitably sized aperture to accommodate passage of said shaft means into the medullary canal and for manipulating at least either said shaft means or the guide wire into and within the respective medullary canal portions of the fractured femur by repositioning the various bone fragments in their proper relative arrangement, said shaft means having graduations along a portion thereof and a bore along its length, said bore having a diameter greater than the diameter of the guide wire to allow selective passage of the guide wire through said bore; and

b. measurement sleeve means configured and dimensioned for movement over at least the graduation portion of said shaft means outside of the medullary canal, so as to permit determination of the length of a nail to be inserted into the medullary canal of the reduced bone, said measurement sleeve means comprising a tubular sleeve movable at least along a portion of said shaft, said tubular sleeve having a body portion with extended flange ends.

23. Apparatus of claim 22 wherein said shaft means is a hollow elongated shaft of a generally uniform diameter along its length.

24. Apparatus of claim 23 wherein said shaft is beveled at its distal end.

25. Apparatus of claim 24 wherein said bore of said shaft is of a generally uniform diameter along its length.

26. Apparatus of claim 23 wherein said shaft has graduations along a portion thereof and which cooperate with said measurement means for determination of the nail length.

27. Apparatus of claim 26 wherein said graduations are evenly spaced apart.

28. Apparatus of claim 27 wherein said graduations are in the range of thirty through forty-eight centimeters.

29. Apparatus of claim 28 wherein said graduations are spaced in one centimeter increments.

30. Apparatus of claim 26 wherein said measurement means comprises a tubular sleeve movable at least along the portion of said shaft having said graduations.

31. Apparatus of claim 30 wherein said tubular sleeve includes a window so as to permit viewing of said graduations on said shaft under said window.

32. Apparatus of claim 31 wherein said tubular sleeve has an arrow indicator positioned generally midway of said window so as to aid in measurement of the length of the nail to be inserted.

33. Apparatus of claim 32 further comprising means for selectively locking said measurement means in a predetermined position on said shaft.

34. Apparatus of claim 33 wherein said tubular sleeve further comprises a passageway communicating with the outer surface of said shaft and said measurement locking means comprises a screw dimensioned and configured for cooperative engagement with said passageway so that said screw can be advanced into said passageway and thereupon contact said outer surface so as to selectively lock said tubular sleeve in position on said shaft.

35. Apparatus of claim 23 further comprising handle means coupled to the proximal end of said shaft for aid in manipulating said shaft into and within the medullary canal, said handle means having a bore along its length aligned coaxially with said bore of said shaft, said handle bore having a diameter greater than the general diameter of the guide wire to allow selective passage of the guide wire through said handle bore.

36. Apparatus of claim 35 wherein said handle means comprises an elongated handle body which is open at one end to receive the proximal end of said shaft therein.

37. Apparatus of claim 36 further comprising chuck means for selectively securing said shaft to said handle body.

38. Apparatus of claim 37 wherein said chuck means comprises threads positioned adjacent said open end of said handle body and a collar having a bore dimensioned and configured so as to permit movement of said collar along at least the proximal end of said shaft, said collar having threads within its bore corresponding to said threads on said handle body so as to permit cooperative engagement of said first and said threads such that said open end of said handle body is selectively pressed by said collar into contact with said shaft for securement thereof.

39. Apparatus of claim 38 wherein said handle means further comprises a generally tubular handle grip positioned about a portion of said elongated handle body.

40. Apparatus of claim 39 wherein said handle means further comprises a handle rod positioned on the distal end of said handle body and extending transversely to said second bore.

41. Apparatus of claim 40 wherein said handle grip is integrally molded about said portion of said elongated handle body.

42. Apparatus of claim 36 further comprising means for selectively locking the guide wire within said second bore in a predetermined position relative to said shaft means.

43. Apparatus of claim 41 wherein said body handle comprises a passageway communicating with and extending transversely to said second bore.

44. Apparatus of claim 43 wherein said guide wire locking means comprises a rod dimensioned for positioning in said handle body passageway and extending therefrom to a free end, said rod having a cam positioned thereon so that said cam enters into said handle bore during at least a portion of one complete rotation of said rod, said cam being configured and dimensioned so that said cam when entering said bore will contact and selectively lock the guide wire within said handle bore in position relative to said shaft.

45. Apparatus of claim 44 further comprising a knob secured to said free end of said cam rod for ease in rotating said cam rod.

46. Method for reducing a fractured bone, having a medullary canal, comprising:

a. exposing at least a portion of the fractured bone as an entry site into the medullary canal of the fractured bone;

b. drilling at said entry site an entry hole into the medullary canal;

c. inserting a fracture reducing apparatus with a guide wire therein through the entry hole into and within the medullary canal, the apparatus comprising shaft means having distal and proximal ends and being configured and dimensioned for passage through said entry hole for manipulating into and within the medullary canal by translational and rotational movements so as to reduce the fractured bone, said shaft means having a bore along its length for passage of the guide wire;

d. manipulating at least one of either said shaft means or the guide wire through the medullary canals of the fragment portions of the fractured bone so as to reduce the fracture by repositioning the various bone fragments in their proper relative arrangement;

e. providing measurement sleeve means on said shaft means prior to insertion through said entry hole, said measurement sleeve means configured and dimensioned for movement over at least a portion of said shaft means, so as to permit determination of the length of a nail to be inserted into the medullary canal of the reduced bone, said measurement sleeve means comprising a tubular sleeve movable at least along a portion of said shaft, said tubular sleeve having a body portion with extended flange ends;

f. advancing the distal end of the guide wire generally into contact with the distal end of the medullary canal;

g. positioning said fracture reducing apparatus so that its proximal end is flush with the proximal end of the guide wire;

h. positioning said measurement means so as to abut the exposed portion of the fractured bone; and

i. determining from said measurement means the length of the nail or rod to be inserted through the medullary canal for fixating the fracture.

47. Method for reducing a fractured femur having a medullary canal, comprising:

a. exposing at least a portion of the proximal end of the fractured femur as an entry site into the medullary canal of the fracture femur;

b. drilling at said entry site an entry hole into the medullary canal;

c. inserting a fracture reducing apparatus with a guide wire therein through the entry hole into and within the medullary canal, the guide wire being of a generally uniform diameter and having an enlarged distal end portion for placement into the medullary canal of the fractured femur, the apparatus comprising a hollow elongated shaft of a generally uniform diameter along its length and having distal and proximal ends and being configured and dimensioned for passage through said entry hole for manipulating into and within the medullary canal portions by translational and rotational movements so as to reduce the fractured femur, said shaft having a bore along its length for passage of the guide wire;

d. manipulating at least one of either said shaft or the guide wire through the medullary canals of the fragment portions of the fractured femur so as to reduce the fracture by repositioning the various bone fragments in their proper relative arrangement;

e. providing a measurement tubular sleeve on said shaft prior to insertion through said entry hole, said measurement tubular sleeve configured and dimensioned for movement over at least a portion of said shaft having graduations therein so as to permit determination of the length of a nail to be inserted into the medullary canal of the reduced bone, said measurement sleeve means comprising a tubular sleeve movable at least along a portion of said shaft, said tubular sleeve having a body portion with extended flange ends;

f. advancing the distal end of the guide wire generally into contact with the distal end of the medullary canal;

g. positioning said fracture reducing apparatus so that its proximal end is flush with the proximal end of the guide wire;

h. positioning said measurement tubular sleeve so as to abut the exposed portion of the fractured bone; and

i. determining from said measurement tubular sleeve the length of the nail or rod to be inserted through the medullary canal for fixating the fracture.