Amputation apparatus

• US 4,781,720 A
• Filed: 02/05/1987
• Issued: 11/01/1988
• Est. Priority Date: 02/05/1987
• Status: Expired due to Fees

• Current Assignee: Carole J. Sherva-Parker
• Original Assignee: Carole J. Sherva-Parker
• Inventors: Sherva-Parker, Carole J.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/011,160
• Time in Patent Office: 635 Days
• Field of Search: 623/16, 623/18, 623/33-37, 623/27
• US Class Current: 623/27
• CPC Class Codes: A61F 2/2814 Bone stump caps

Abstract

Disclosed is an internal prosthesis for use with a prosthesis attachable externally to a residual limb having a bone with a free end thereof. The internal prosthesis comprises bone end pressure distributing means disposed completely within the residual limb and open-bottomed bone end containing means attached to the bone end pressure distributing means. In separate embodiments, the bone end pressure distributing means comprises a tubular, mesh sock/sleeve with a central aperture. The open-bottomed end containing means comprises a mesh bone sock/sleeve which surrounds the central aperture and extends up the bone disposed around the aperture and also provided with a reinforced portion. Alternatively, the bone end pressure distributing means comprises a radially extending plate with an central aperture around which is disposed an upwardly extending boss. The bone end containing means comprises an open-ended bone cap which is formed of two sections. The first section comprises a portion of bone pins and the second section comprises a boss with a smaller diameter than the first section.

Claims

1. An internal prosthesis for use with a prosthesis attachable externally to a residual limb having a bone with a free end therein, the internal prosthesis comprising:

bone end pressure distributing means disposed completely within the residual limb;

open-bottomed bone end containing means attached to the bone end pressure distributing means;

means for reinforcing the bone end pressure distributing means; and

wherein the bone end pressure distributing means comprises a large, flexible, tubular sock/sleeve sized to fit over the muscle tissue of the residual limb and underneath the skin thereof, having a smooth, continuous, reinforced, closed end portion to receive the full force of pressure generated by the free end of the bone.

2. The internal prosthesis of claim 1 wherein the bone end containing means comprises a bone sock/sleeve sized to fit over the free end of the bone disposed at the center of the reinforced portion and integral therewith;

and

a means of permanently fastening the bone sock/sleeve to the bone.

3. The internal prosthesis of claim 2 wherein the tubular sock/sleeve further comprises a support ring having a circular piece disposed around the exterior of the bone sock/sleeve adjacent the reinforced portion and an X-shaped cross-piece integral with the circular piece and disposed interiorly of the bone sock/sleeve, with the arms of the X extending therethrough.

4. The internal prosthesis of claim 1 wherein the large sock/sleeve is comprised of a mesh material.

5. The internal prosthesis of claim 1 wherein the diameter of the reinforced portion is at least one and onefourth the diameter of the bone.

6. The internal prosthesis of claim 4 wherein the reinforced portion is comprised of a strengthened mesh material.

7. The internal prosthesis of claim 4 wherein the reinforced portion is comprised of a solid material.

8. The internal prosthesis of claim 2 wherein the bone sock/sleeve further comprises a reinforced section adjacent to and integral with the reinforced portion and extending upwardly from the reinforced portion.

9. The internal prosthesis of claim 2 wherein the fastening means is selected from the group consisting of adhesives, screws, clamps, pins, staples and combinations thereof.

10. The internal prosthesis of claim 1 further comprising intermittent suture fastening means to fasten the large sock/sleeve to the muscle tissue and skin of the residual limb.

11. The internal prosthesis of claim 1 wherein the bone end containing means comprises:

a cap securable to the end of the bone, the cap having an open top and bottom, first and second side portions with the second portion having a smaller diameter than the first portion to define an outwardly extending boss on the cap, and an internal cavity formed in the cap sized to fit externally over the free end of the bone.

12. The internal prosthesis of claim 11 wherein the bone end pressure distributing means comprises:

a plate having top and bottom surfaces, a centrally located aperture formed therein, and a boss formed on the top surface, disposed around the aperture and sized to receive the boss on the bone cap therein, the plate extending radially outward a substantial distance beyond the periphery of the boss to evenly distribute forces from the prosthesis over the end of the residual limb, the plate being disposed completely within the residual limb; and

support means disposed within the aperture to support the free end of the bone.

13. The internal prosthesis of claim 12 wherein the support means comprises at least two rods joined at their centers with their ends projecting radially outward therefrom and connecting to the plate.

14. The internal prosthesis of claim 12 wherein the support means comprises at least two rods each attached to an end thereof and extending upward and outward therefrom.

15. The internal prosthesis of claim 12 wherein the support means comprises a piece of reinforced mesh attached at an end thereof to the plate.

16. The internal prosthesis of claim 12 further comprising a plurality of concentric ribs formed on the plate.

17. The internal prosthesis of claim 12 further comprising an upwardly extending rim formed integrally on the perimeter of the plate to prevent slippage thereof with respect to the residual limb when the prosthesis is in place.

18. The internal prosthesis of claim 11 wherein the first portion of the bone cap is comprised of a first ring and at least two prongs projecting upwardly therefrom, each of said at least two prongs terminating in a tip.

19. The internal prosthesis of claim 18 wherein each tip is inwardly bent to grip the bone securely.

20. The internal prosthesis of claim 18 wherein the prongs integrally terminate in a second ring disposed in parallel and spaced apart relation to the first ring.

21. The internal prosthesis of claim 18 wherein the first portion further comprises a non-terminal ring disposed around the at least two prongs near the tips thereof.

22. The internal prosthesis of claim 18 wherein the first portion further comprises a plurality of guide loops formed on the side of at the least two prongs opposite the side adjacent the bone and near the tips, a cable whose ends are threaded through the loops and encircle the bone, and an adjustable connector to connect the two ends and draw them together, thereby tightening the cable around the bone and securing the cap thereto.

23. The internal prosthesis of claim 11 wherein the first section further comprises a ring and at least one spiral projecting upwardly thereform to encircle the bone.

24. The internal prosthesis of claim 23 wherein the prosthesis comprises at least two spirals, each being oriented in a common radial direction.

25. The internal prosthesis of claim 23 wherein the prosthesis comprises at least two spirals, each being oriented in opposite radial directions.

26. The internal prosthesis of claim 11 wherein the first section comprises a ring and a mesh sleeve having an open rolled top and an open bottom sized to encircle the bone, said bottom being attached to an internal surface of a second section and being fastened to the bone at the rolled top a fastening means.

27. The internal prosthesis of claim 11 wherein the first section comprises a mesh sleeve with an open top and bottom sized to encircle the bone, said bottom being attached to an internal surface of the first section, a ring, a plurality of guide loops disposed around the periphery of the ring, a tunnel formed in the mesh encircling the bone adjacent the ring, said tunnel having a plurality of openings formed on an external surface thereof at locations adjacent the plurality of guide loops, a cable having two ends passing alternately through one of the plurality of guide loops and one of the plurality of tunnel openings, and an adjustable connector connecting the two ends and drawing them together to tighten the cable and secure the sleeve to the bone.

28. An internal prosthesis for use with a prosthesis attachable externally to a residual limb having a bone with a free end therein, the internal prosthesis comprising:

bone end pressure distributing means comprising a magnetic material with which is associated a magnetic field and disposed completely within the residual limb; and

open-bottomed bone end containing means attached to the bone and pressure distributing means.