Femoral intramedullary rod system

• US 6,221,074 B1
• Filed: 06/10/1999
• Issued: 04/24/2001
• Est. Priority Date: 06/10/1999
• Status: Expired due to Term

• Current Assignee: Orthodyne, Inc.
• Original Assignee: Orthodyne, Inc.
• Inventors: Cole, J. Dean, Knobloch, Carl A.
• Primary Examiner(s): Hirsch, Paul J.
• Assistant Examiner(s): Priddy, Michael B.
• Application Number:
  US09/329,688
• Time in Patent Office: 684 Days
• Field of Search: 606/60, 606/62, 606/64, 606/67
• US Class Current: 606/62
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/7216 for bone lengthening or compression A61B17/7258 takes precedence
• CPC Class Codes: A61B 17/7225 for bone compression
• CPC Class Codes: A61B 17/7241 the nail having separate elements through which screws pass
• 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
• CPC Class Codes: A61B 17/748 with means for adapting the angle between the longitudinal elements and the shaft axis of the femur
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts

Abstract

A femoral intramedullary rod system capable of treating a variety of femoral bone fractures using a uniform intramedullary rod design. The system generally comprising an intramedullary rod defining an opening having an upper surface and a transverse member including a bone engaging portion and a connection portion defining a thru-hole with the nail sized to pass therethrough. A pin is selectively coupled to the transverse member to rigidly assemble the transverse member to the nail when the nail is passed through the thru-hole and the pin is received within the opening.

Claims

1. A system for treating bone fractures, the system comprising:

an intramedullary nail defining an opening, said opening having an upper surface and a lower surface;

a transverse member including a bone engaging portion and a connection portion, said connection portion defining a thru-hole, said nail being sized to pass through said thru-hole; and

a pin selectively attached to said transverse member and operable to rigidly assemble said transverse member to said nail when said nail passes through said thru-hole and said pin is received within said opening.

2. The system of claim 1 wherein said transverse member defines a passage intersecting said through-hole.

3. The system of claim 2 wherein said passage includes a threaded portion, said pin includes a leading portion and a trailing portion, said leading portion has an elongated section configured to be slidably received within said opening, said trailing portion has external threads to engage said threaded portion to advance said pin through said passage.

4. The system of claim 1 wherein said pin includes an engaging surface configured to engage said nail and clamp said nail against said transverse member.

5. The system of claim 1 wherein said pin includes a leading portion and a trailing portion, one of said leading portion and said trailing portion includes a ball member and another of said leading portion and said trailing portion includes a socket member, said ball and socket members cooperating to permit angular variation between said leading portion and said trailing portion.

6. The system of claim 5 wherein said nail defines a first longitudinal axis and said opening defines a generally straight pathway positioned at about 135 degrees relative to said first longitudinal axis, said transverse member defines a second longitudinal axis and said through-hole is positioned within a range of about 130 to 145 degrees relative to said second longitudinal axis.

7. The system of claim 1 wherein said connection portion is adapted to slidably receive said bone engaging portion.

8. The system of claim 7 wherein said bone engaging portion includes a keeper, said connection portion includes an inner retaining lip, said keeper co-acting with said retaining lip to provisionally maintain said bone engaging portion and said connection portion in sliding engagement.

9. The system of claim 1 further comprising a locking mechanism positioned adjacent said pin to prevent movement of said pin relative to said transverse member.

10. The system of claim 1 wherein said nail defines a longitudinal axis and includes a longitudinal passageway extending at least partially therethrough and intersecting said opening, a portion of said longitudinal passageway being threaded to engage a set screw, said set screw including a stem portion adapted to be slidably received within said longitudinal passageway to lockingly engage said pin.

11. The system of claim 1 wherein said nail defines a longitudinal axis, said lower surface of said opening defines a first angled portion to engage said pin in an abutting relationship with said pin oriented at a first oblique angle relative to said longitudinal axis.

12. The system of claim 11 wherein said upper surface of said opening defines a second angled portion generally opposite said first angled portion to engage said pin when said pin is oriented at said first oblique angle.

13. The system of claim 12 wherein said lower surface defines a third angled portion to engage said pin in another abutting relationship with said pin oriented at a second oblique angle relative to said longitudinal axis.

14. The system of claim 13 wherein said upper surface defines a fourth angled portion generally opposite said third angled portion to engage said pin when said pin is oriented at said second oblique angle.

15. The system of claim 14 wherein said first and second oblique angles are each about 135 degrees.

16. The system of claim 14 wherein said opening extends through said nail, and wherein said first and third angled portions define a first apex and said second and fourth angled portions define a second apex opposite said first apex.

17. A device for treating bone fractures, the device comprising:

an intramedullary nail defining an opening, said opening having an upper surface and a lower surface;

a transverse member including means for engaging bone, said transverse member defining a thru-hole, said nail being sized to pass through said thru-hole; and

means for locking said transverse member in position relative to said nail, said locking means including a pin sized to pass through said opening and rigidly assemble said transverse member to said nail.

18. The device of claim 17 wherein said transverse member defines a longitudinal axis and includes means for permitting free movement of said engaging means along said longitudinal axis of said transverse member.

19. The device of claim 18 wherein said transverse member includes means for provisionally maintaining said engaging means and said transverse member in sliding engagement.

20. The device of claim 17 wherein said locking means includes a means for allowing angular variation between said locking means and said transverse member.

21. The system of claim 17 wherein said opening extends through said nail.

22. A method of treating a bone fracture, the method comprising:

forming a first hole in a femur transverse to the medullary canal;

introducing a transverse bone engaging member through the first hole, the bone engaging member including a thru-hole, the thru-hole being positioned adjacent the medullary canal;

forming a second hole into the medullary canal;

inserting an intramedullary nail into the medullary canal through the second hole, the nail passing through the thru-hole of the bone engaging member, the nail including an opening positioned adjacent the bone engaging member, the opening having an upper surface and a lower surface; and

rigidly assembling the bone engaging member and the nail by passing a pin selectively coupled to the bone engaging member into the opening of the nail.

23. The method of claim 22 including adjusting the angular position of the pin relative to the bone engaging member.

24. The method of claim 22 wherein the assembling includes threading the pin into a passage defined by the bone engaging member, the passage intersecting the thru-hole.

25. The method of claim 22 wherein the upper and lower surfaces are angeled to define a first apex opposite a second apex.

26. The method of claim 22 wherein the introducing includes threading at least a portion of the bone engaging member into bone.