Multi-purpose prosthetic knee component

• US 5,704,946 A
• Filed: 03/13/1996
• Issued: 01/06/1998
• Est. Priority Date: 03/13/1996
• Status: Expired due to Fees

• Current Assignee: United States Manufacturing Company, LLC
• Original Assignee: United States Manufacturing Co.
• Inventors: Greene, Ted J.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US08/614,646
• Time in Patent Office: 664 Days
• Field of Search: 623/39-47
• US Class Current: 623/44
• CPC Class Codes: A61F 2/64 Knee joints
• CPC Class Codes: A61F 2/74 fluid , i.e. hydraulic or pneumatic
• CPC Class Codes: A61F 2/80 Sockets, e.g. of suction type
• CPC Class Codes: A61F 2002/30069 elastomeric
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• 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 2002/5016 adjustable for implantable prostheses A61F2002/30537
• CPC Class Codes: A61F 2002/5043 with rotation-limiting stops, e.g. projections or recesses
• CPC Class Codes: A61F 2002/607 Lower legs
• CPC Class Codes: A61F 2002/6614 Feet
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2250/0019 differing in hardness, e.g. Vickers, Shore, Brinell
• CPC Class Codes: A61F 2310/00047 Aluminium or Al-based alloys

Abstract

A prosthetic knee component for an above knee prosthesis having a frame member and a bracket member pivotally connected to the frame member, thereby creating a center of rotation for the knee component. The knee component further including a gait control unit pivotally positioned between the frame member and the bracket member by flanges extending from a rear portion of the bracket member. A flexion bumper is positioned through the frame member away from the center of rotation and is sufficiently compressible in a flexion phase of the knee component to provide controlled energy absorbing compliance under force exerted on the bumper by the rear flanges. The knee component further includes an optional running gait flexion limiter positioned on an interior surface of the frame member for limiting flexion and providing inertia to the lower leg component during a running gait. The running gait flexion limiter provides inertia to the lower leg component by being sufficiently resilient in a flexion phase of the knee component to provide a controlled spring rate to the flanges on the bracket member to quickly return the lower leg component to an extension phase.

Claims

1. A prosthetic knee component for an above-knee prosthesis comprising:

a frame member;

a bracket member having means for pivotally connecting the bracket member to the frame member thereby creating a center of rotation for the knee component;

a force control unit secured between the frame member and the bracket member; and

a flexion bumper positioned within the frame member b, end plugs, the flexion bumper being sufficiently compressible in a flexion phase of the knee component to provide controlled energy absorbing compliance under force exerted on the bumper by the bracket member.

2. The prosthetic knee component of claim 1 wherein the means for pivotally connecting the bracket member to the frame member comprises a flange extending downwardly on either side of the bracket member and a shaft passing through the flanges and the frame member.

3. The prosthetic knee component of claim 1 wherein said bracket member further includes flanges extending downwardly from a rear portion of the bracket member, said flanges contacting the flexion bumper during said flexion phase and for pivotally connecting the bracket member to the force control unit.

4. The prosthetic knee component of claim 2 wherein the flexion bumper is positioned within the frame member away from the center of rotation of the knee component through axially aligned bores located on each side of the frame member.

5. The prosthetic knee component of claim 4 wherein the end plugs are located in said flanges for applying axial forces to the ends of the bumper for maintaining the bumper within the axially aligned bores.

6. The prosthetic knee component of claim 1 wherein the bracket member is rigidly secured to a thigh component and the frame member is rigidly secured to a lower leg component.

7. The prosthetic knee component of claim 6 wherein the knee component further comprises at least one running gait flexion limiter positioned within an interior surface of the frame member for limiting knee flexion and being sufficiently resilient to provide inertia to the lower leg component during an extension phase.

8. The prosthetic knee component of claim 7 wherein the running gait flexion limiter limits flexion by being positioned downwardly and rearwardly of the flexion bumper.

9. The prosthetic knee component of claim 8 wherein the running gait flexion limiter provides inertia to the lower leg component by being sufficiently resilient in a flexion phase of the knee component to provide a controlled spring rate to the bracket member as the bracket member contacts the running gait flexion limiter to return the lower leg component to an extension phase.

10. An above knee prosthesis comprising:

a thigh component;

a lower leg component;

and a knee component positioned between the thigh component and the lower leg component;

the knee component having a frame member and a bracket member, the bracket member having means for pivotally connecting the bracket member to the frame member thereby creating a center of rotation for the knee component, a gait control unit secured between the frame member and the bracket member, said bracket member further having attachment means for pivotally connecting the control unit to the bracket member, a flexion bumper compressibly positioned within the frame member by threaded end caps, the flexion bumper being sufficiently compressible in a flexion phase of the knee component to provide controlled energy absorbing compliance under force exerted on the bumper by the bracket member control unit attachment means.

11. The prosthesis of claim 10 wherein the means for pivotally connecting the bracket member to the frame member are flanges extending downwardly from either side of an upper surface of the bracket member and a shaft passing through the flanges and the frame member.

12. The prosthesis of claim 10 wherein the attachment means for pivotally connecting the bracket member to the control unit are flanges extending downwardly from a rear portion of the bracket member.

13. The prosthesis of claim 12 wherein the prosthesis further includes at least one running gait flexion limiter positioned within an interior surface of the frame member for limiting knee flexion and being sufficiently resilient to provide inertia to the lower leg component during an extension phase.

14. The prosthesis of claim 13 wherein the running gait flexion limiter limits flexion by being positioned downwardly and rearwardly the flexion bumper.

15. The prosthesis of claim 14 wherein the flexion limiter provides inertia to the lower leg component by being sufficiently resilient in a flexion phase of the knee component to provide a controlled spring rate to the rear flanges of the bracket member to rapidly return the lower leg component to an extension phase.

16. The prosthesis of claim 10 wherein the flexion bumper is positioned within the frame member away from the center of rotation of the knee component through axially aligned bores located on each side of the frame member.