Intramedullary intertrochanteric fracture fixation appliance and fitting device

• US 5,176,681 A
• Filed: 12/09/1988
• Issued: 01/05/1993
• Est. Priority Date: 12/14/1987
• Status: Expired due to Term

• Current Assignee: Howmedica International S. De R.L. (Stryker Corporation)
• Original Assignee: Howmedica International Incorporated (Stryker Corporation)
• Inventors: Taylor, Stephen, Adcock, Philip J., Lawes, Peter
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): Rooney, Kevin G.
• Application Number:
  US07/281,730
• Time in Patent Office: 1,488 Days
• Field of Search: 128/92 Y, 128/92 YZ, 128/92 YY, 128/92 YK, 128/92 YW, 128/92 YV, 128/92 YS, 128/92 YJ, 128/92 YF, 128/92 VD, 128/92 YP, 128/92 YE, 128/92 V , 128/92 VY, 128/92 W, 128/92 VT, 606/64, 606/65, 606/98
• US Class Current: 606/64
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61B 17/921 for intramedullary devices

Abstract

An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having an angulated opening to receive a femoral neck screw, said rod having a co-axial bore extending into said angulated opening, anti-rotation means located in said bore to selectively prevent rotation of said neck screw in the rod and the open end of said bore being provided with means to positively locate a removable fitting device on the proximal end of the rod and so that said anti-rotation means can be operated with the fitting device in position.

Claims

1. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, said neck screw having proximal and distal ends, anti-rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, said rod proximal end having means for positively locating a removable fitting device in position on said rod proximal end, and said positive locating means being constructed and arranged for said anti-rotation means to be operated with the fitting device in its positively located position.

2. The appliance as defined in claim 1 wherein said anti-rotation means is constructed and arranged for locking the neck screw in position in the rod opening.

3. The appliance as defined in claim 1 wherein said anti-rotation means includes at least one longitudinally extending groove in said neck screw which can be engaged by a set screw located in said bore.

4. The appliance as defined in claim 1 wherein said neck screw proximal end includes means for receiving a removable fitting device.

5. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received.

6. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said guiding means includes a tunnel locator.

7. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, said guiding means includes a tunnel locator, and said tunnel locator is aligned with said angulated opening.

8. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjustor extending through said tunnel locator adapted for connection to the neck screw proximal end, and said tension adjuster includes adjustment means for applying tension to said neck screw.

9. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, said tension adjuster includes adjustment means for applying tension to said neck screw, said tunnel locator includes proximal and distal ends, and said adjustment means engages the tunnel locator proximal end to apply a compression force thereon between said adjustment means and said rod.

10. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, said tension adjuster includes adjustment means for applying tension to said neck screw, said tunnel locator includes proximal and distal ends, said adjustment means engages the tunnel locator proximal end to apply a compression force thereon between said adjustment means and said rod, and said tension adjuster includes means to drivingly engage said neck screw to rotate the same to a desired position of fixation.

11. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, said tension adjuster includes adjustment means for applying tension to said neck screw, said tunnel locator includes proximal and distal ends, and said adjustment means engages the tunnel locator proximal end to apply a compression force thereon between said adjustment means and said rod, said tension adjuster includes means to drivingly engage said neck screw to rotate the same to a desired position of fixation, said tension adjuster includes a screwdriver having a hollow shaft, said hollow shaft having proximal and distal ends, said shaft distal end having means for engaging said neck screw rotated to is position of fixation, said shaft having an operating handle, said tensioning adjuster further including a tension adjusting mechanism extending axially through said hollow shaft, said tensioning adjusting mechanism having proximal and distal ends, said tension adjusting mechanism distal end being threaded to engage threads of said neck screw proximal end, and said tension adjusting mechanism proximal end having means for rotating said tension adjusting mechanism.

12. The appliance as defined in claim 1 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said removal fitting device further includes means for accurately guiding a hole forming mechanism adapted to form a hole in the femur for rod distal end securement.

13. The appliance as defined in claim 1 wherein said anti-rotation means includes at least one longitudinally extending groove in said neck screw which can be engaged by a set screw located in said bore, and said set screw further locks against said neck screw to prevent rotation thereof.

14. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means including locking means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, and adjustable means for permitting sliding movement between said rod and said neck screw along a portion of the length of said neck screw in only one direction to maintain bone fragments on opposite sides of a fracture under compression while said anti-rotation means remains operative to prevent rotation of said neck screw.

15. The appliance as defined in claim 14, wherein said adjustable means includes an adjustable stop.

16. The appliance as defined in claim 14, wherein said anti-rotation means includes an adjustable stop.

17. The appliance as defined in claim 14, wherein said adjustable means and said anti-rotation means include an adjustable stop.

18. The appliance as defined in claim 14, wherein said anti-rotation means is also constructed and arranged for locking said neck screw against sliding movement.

19. The appliance as defined in claim 14, wherein said anti-rotation means includes a longitudinally extending groove formed in said neck screw and a set screw located in said bore having a distal end received in said groove.

20. The appliance as defined in claim 14, wherein said locking means is a set screw.

21. The appliance as defined in claim 14, wherein said adjustable means is operable for maintaining a fracture under compression only when said anti-rotation means prevents rotation of said neck screw in said rod opening.

22. The appliance as defined in claim 14, wherein said locking means is operative in (a) one position in which neck screw rotation is prevented but neck screw axial movement is permitted in opposite direction and (b) another position in which neck screw rotation is prevented but neck screw axial movement is permitted in only one direction.

31. The appliance as defined in claim 14 including a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, said tension adjuster includes adjustment means for applying tension to said neck screw, said tunnel locator includes proximal and distal ends, said adjustment means engages the tunnel locator proximal end to apply a compression force thereon between said adjustment means and said rod, said tension adjuster includes means to drivingly engage said neck screw to rotate the same to a desired position of fixation, said tension adjustor includes a screwdriver having a hollow shaft, said hollow shaft having proximal and distal ends, said shaft distal end having means for engaging said neck screw rotated to its position of fixation, said shaft having an operating handle, said tensioning adjuster further including a tension adjusting mechanism extending axially through said hollow shaft, said tensioning adjusting mechanism having proximal and distal ends, said tension adjusting mechanism distal end being threaded to engage threads of said neck screw proximal end, and said tension adjusting mechanism proximal end having means for rotating said tension adjusting mechanism.

32. An intramedullary intertrochanteric fracture fixation appliance as claimed in claim 14, in combination with a removable fitting device provided with means for positive location in the bore on the proximal end of the rod, means allowing location of the set screw, guide means for accurately guiding means for forming a hole in the femoral end head to receive said femoral neck screw, and said removal fitting device further including means for guiding a hole forming mechanism adapted to form a hole in the femur for rod distal end securement.

23. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, said anti-rotation means includes a longitudinally extending groove formed in said neck screw and a set screw located in said bore having a distal end received in said groove, and wherein said groove is in the form of an inclined ramp which cooperates with said set screw to provide the selected length of sliding movement along said neck screw.

24. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation of of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device, said rod proximal end having means for positively locating said removable fitting device in position on said rod proximal end, and said positive locating means being constructed and arranged for said anti-rotation means to be operated with the fitting device in its positively located position.

25. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device positively located on the rod proximal end by said locating means, said removable fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, and said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received.

26. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device positively located on the rod proximal end by said locating means, said removing fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said guiding means includes a tunnel locator.

27. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device positively located on the rod proximal end by said locating means, said removing fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said guiding means includes a tunnel locator, and said tunnel locator is aligned with said angulated opening.

28. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device positively located on the rod proximal end by said locating means, said removing fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, and said tension adjuster includes adjustment means for applying tension to said neck screw.

29. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device positively located on the rod proximal end by said locating means, said removing fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, and said tension adjuster includes adjustment means for applying tension to said neck screw, said tunnel locator includes proximal and distal ends, and said adjustment means engages the tunnel locator proximal end to apply a compression force thereon between said adjustment means and said rod.

30. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, adjustable means for effecting sliding movement between said rod and said neck screw over a selected portion of the length of said neck screw while sand anti-rotation means remains operative to prevent rotation of said neck screw, a removable fitting device positively located on the rod proximal end by said locating means, said removing fitting device having an access opening means through which said anti-rotation means can be operated when the fitting device is in its positively located position, said removable fitting device having guide means for accurately guiding a hole forming mechanism adapted to form a hole in a femoral end head into which said neck screw is adapted to be received, and said guiding means includes a tunnel locator, said tunnel locator is aligned with said angulated opening, a removable tension adjuster extending through said tunnel locator adapted for connection to the neck screw proximal end, and said tension adjuster includes adjustment means for applying tension to said neck screw, said tunnel locator includes proximal and distal ends, and said adjustment means engages the tunnel locator proximal end to apply a compression force thereon between said adjustment means and said rod, and said tension adjuster includes means to drivingly engage said neck screw to rotate the same to desired position of fixation.

33. An intramedullary intertrochanteric fracture fixation appliance comprising an intramedullary rod having proximal and distal ends, an angulated opening in said proximal end, said rod having a generally axial bore through said proximal end opening into said angulated opening, a femoral neck screw at least partially housed in and projecting from said angulated opening, anti-rotation means operative through said bore for selectively preventing rotation means operative through said bore for selectively preventing rotation of said neck screw in said rod opening, and said anti-rotation means being further cooperative with adjustments means for permitting sliding movement between said rod and said neck screw in only one direction over a selected portion of the length of said neck screw while said anti-rotation means remains operative to prevent rotation of said neck screw.

34. The appliance as defined in claim 33 wherein said anti-rotation means includes a plurality of longitudinally extending grooves formed in said neck screw and a set screw located in said bore having a distal end received in said groove, and each of said grooves in longitudinally tapered for effecting sliding movement in said only one direction.