Bone compression or distraction device

• US 4,187,841 A
• Filed: 07/07/1978
• Issued: 02/12/1980
• Est. Priority Date: 07/07/1978
• Status: Expired due to Term

• Current Assignee: Richard A. Knutson
• Original Assignee: Richard A. Knutson
• Inventors: Knutson, Richard A.
• Primary Examiner(s): Frinks, Ronald L.
• Application Number:
  US05/922,786
• Time in Patent Office: 585 Days
• Field of Search: 128/92 A, 128/92 B, 128/92 D, 128/92 E, 128/92 EA, 128/92 R, 128/92 G, 128/84 R, 128/84 B, 128/83
• US Class Current: 606/105
• CPC Class Codes: A61B 17/66 Alignment, compression or distraction mechanisms
• CPC Class Codes: A61B 17/8875 Screwdrivers, spanners or wrenches

Abstract

A surgical tool which may be utilized either for compression or distraction of a fractured bone. The tool includes a threaded shaft having a pair of cap members secured to each end thereof. Projecting from one of the cap members is a short pin which is preferably angled either towards or away from the other cap member. An internally threaded sleeve is mounted on the shaft between the cap members and includes a knob having a knurled outer surface for permitting the sleeve to be manually adjusted in either direction along the threaded shaft. Another pin-supporting member is removably mounted about the sleeve and has another short pin projecting from one surface thereof. The two pins are positioned within pre-drilled holes on each side of a fractured bone that is to be compressed or distracted.

Claims

1. A bone compression or distraction tool, which comprises:

a threaded shaft;

a cap member secured to one end of said shaft, said cap member having at least one relatively short pin projecting therefrom;

a threaded sleeve rotatably engaged about said threaded shaft;

a knob means secured to and extending outwardly from said sleeve for enabling rotation of same and forming a shoulder; and

a pin carrying member removably fittable about said sleeve and having at least one relatively short pin projecting therefrom, one end of said pin carrying member being engagable by said shoulder so as to move towards or away from said cap member upon rotation of said knob means.

2. The bone compression or distraction tool as set forth in claim 1, wherein said cap member includes a plurality of pins projecting therefrom.

3. The bone compression or distraction tool as set forth in claim 1, wherein said cap member and said pin carrying member each have at least one substantially planar face adapted to be adjacent the bone and which are coplanar, parallel to the axis of said shaft, and respectively have said short pins extending therefrom.

4. The bone compression or distraction tool as set forth in claim 1, wherein each of said short pins are angled at approximately 5°

from an axis perpendicular to the axis of said shaft.

5. The bone compression or distraction tool as set forth in claim 4, wherein said short pins are inclined towards one another whereby said tool serves as a bone compression device.

6. The bone compression or distraction tool as set forth in claim 4, wherein said short pins are inclined away from one another whereby said tool serves as a bone distraction device.

7. The bone compression or distraction tool as set forth in claim 2, wherein certain of said pins have a diameter different than the diameter of other pins whereby bones of differing sizes may be worked on by the same tool.

8. The bone compression or distraction tool as set forth in claim 1, wherein said threaded sleeve is between said knob means and said cap member whereby said tool serves as a bone compression device.

9. The bone compression or distraction tool as set forth in claim 1, wherein said knob means is positioned between said cap member and said threaded sleeve whereby said tool serves as a bone distraction device.

10. The bone compression or distraction tool as set forth in claim 1, wherein said threaded sleeve extends along said shaft on both sides of said knob member whereby said tool serves as either a bone compression or distraction device.

11. The bone compression or distraction tool as set forth in claim 1, wherein said pin carrying member includes an opening along its length which is wider than the diameter of said shaft but smaller than the diameter of said sleeve.

12. The bone compression or distraction tool as set forth in claim 11, wherein said pin carrying member also includes an unthreaded, inner substantially cylindrical surface having a smaller radius at one portion thereof than that at a second portion thereof.

13. The bone compression or distraction tool as set forth in claim 12, wherein said one portion of said inner surface is adapted to be placed about said shaft, while said second portion thereof is adapted to be placed about said sleeve.

14. The bone compression or distraction tool as set forth in claim 7, wherein some of said plurality of pins in said cap member are inclined towards said sleeve, while others of said plurality of pins in said cap member are inclined away from said sleeve.

15. The bone compression or distraction tool as set forth in claim 1, wherein said knob means includes aperture means on the periphery thereof adapted to receive a wrench for turning same.

16. The bone compression or distraction tool as set forth in claim 1, further comprising a second cap member secured to the other end of said shaft.