Torque absorber with biofeedback

• US 4,387,472 A
• Filed: 10/02/1980
• Issued: 06/14/1983
• Est. Priority Date: 10/02/1980
• Status: Expired due to Term

• Current Assignee: Medical Care Service Company Incorporated (Gakken Holdings Co., Ltd.)
• Original Assignee: Medical Center Prosthetics Incorporated
• Inventors: Wilson, Michael T.
• Primary Examiner(s): Frinks, Ronald L.
• Application Number:
  US06/193,129
• Time in Patent Office: 985 Days
• Field of Search: 3/1, 3/1.1, 3/2, 3/21, 3/30-35, 128/779, 128/774, 128/782, 73/172, 340/573
• US Class Current: 623/49
• CPC Class Codes: A61F 2/66 Feet; Ankle joints
• CPC Class Codes: A61F 2/6607 Ankle joints
• CPC Class Codes: A61F 2002/30462 retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/5003 having damping means, e.g. shock absorbers for implantable joints A61F2002/30563
• CPC Class Codes: A61F 2002/5007 having elastic means different from springs, e.g. including an elastomeric insert elastic coating A61F2002/3007; springs A61F2002/5072; plate-like springs for feet A61F2002/6657
• CPC Class Codes: A61F 2002/503 for adjusting elasticity, flexibility, spring rate or mechanical tension
• CPC Class Codes: A61F 2002/7635 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable

Abstract

A two-element prosthesis is provided with a resilient connector that permits limited rotation of one element relative the other about the three axes of the two elements as defined by the junction of the two elements. The resilient connector further absorbs a limited amount of compressive shock transmitted from one element to the second element. The resilient member includes a sensing system that indicates a compressive force at the resilient member in excess of a predetermined amount.

Claims

1. A prosthesis comprising:

a first member;

a second member;

means for interconnecting said first and said second members while allowing limited motion therebetween;

said interconnecting means including a resilient member disposed between said first and second member;

indicator means positioned in said resilient member for sensing a predetermined force between said first member and said second member.

2. The prosthesis of claim 1 wherein said indicator means includes adjustment means for varying the predetermined force.

3. The prosthesis of claim 1 wherein the interconnecting means includes flexible means for permitting limited motion between said first and said second members.

4. The prosthesis of claim 1 further including a flange affixed to said first member.

5. The prosthesis of claim 4 wherein the interconnecting means includes flexible means for permitting limited motion between said first and said second members.

6. The prosthesis of claim 4 wherein said first member is an endoskeletal prosthetic limb and said second member is a prosthetic foot.

7. The prosthesis of claim 1 wherein said interconnecting means further includes an elongated flexible member fixable at one end to said first member and fixable as its other end to said second member, said resilient member disposed around said flexible member, said flexible member formed to be placed under tension.

8. The prosthesis of claim 7 wherein said first member defines an axis and further wherein the indicator means includes a first sensing element and a second sensing element, each located in a sagittal plane passing through the axis of said first member, said first sensing element anterior of said first member axis and said second sensing element posterior of said first member axis.

9. The prosthesis of claim 8 wherein the indicator means includes a source of electrical energy and an audible alarm.

10. The prosthesis of claim 9 wherein each of said first and said second sensing elements is a pressure sensitive normally open switch.

11. The prosthesis of claim 10 wherein said indicator means further includes first and second variable adjustment means for placing said first and said second pressure sensitive switches under a predetermined load less than the load required to close said switches.

12. A pressure sensing system for a prosthesis, the prosthesis including a first member and a second member, the pressure sensing system comprising:

means for interconnecting said first and said second members while allowing limited motion therebetween;

said interconnecting means including a resilient member disposed between said first and second member;

indicator means positioned in said resilient member for sensing a predetermined force between said first and said second member.

13. The pressure sensing system of claim 12 wherein said interconnecting means includes a flange affixed to one of said first and said second members.

14. The pressure sensing system of claim 13 wherein said interconnecting means further includes an elongated flexible member fixable at one end to said first member and fixable at its other end to said second member, said resilient member disposed around said flexible member, said flexible member formed to be placed under tension.

15. The pressure sensing system of claim 14 wherein said first member defines an axis and further wherein the indicator means includes a first sensing element and a second sensing element, each located in a sagittal plane passing through the axis of said first member, said first sensing element anterior of said first member axis and said second sensing element posterior of said first member axis.

16. The pressure sensing system of claim 15 wherein the indicator means further includes a source of electrical energy and an audible alarm.

17. The pressure sensing system of claim 16 wherein each of said first and said second sensing elements is a pressure sensitive normally open switch.

18. The pressure sensing system of claim 17 wherein said indicator means further includes first and second variable adjustment means for placing said first and said second pressure sensitive switches under a predetermined load less than the load required to close said switches.