Transfemoral rotator using push button spring clips

• US 10,639,171 B2
• Filed: 01/04/2017
• Issued: 05/05/2020
• Est. Priority Date: 01/28/2016
• Status: Active Grant

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Cavuto, Matthew L., Chun, Matthew L.
• Primary Examiner(s): Bahena, Christie L
• Application Number:
  US15/398,159
• Publication Number:
  US 20170216054A1
• Time in Patent Office: 1,217 Days
• CPC Class Codes: A61F 2/64 Knee joints
• CPC Class Codes: A61F 2/68 Operating or control means
• CPC Class Codes: A61F 2/76 Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means
• CPC Class Codes: A61F 2002/5018 for adjusting angular orientation
• CPC Class Codes: A61F 2002/5072 having spring elements
• CPC Class Codes: A61F 2002/607 Lower legs
• CPC Class Codes: A61F 2002/6854 for locking or unlocking a joint

Abstract

A transfemoral rotator is provided. The transfemoral rotator includes an inner cylinder that nests within a cavity of a base shell. The inner cylinder includes a lower cylindrical hub configured to protrude through an opening in the base shell. A spring clip mechanism operated by a push button serves to lock and unlock the transfemoral rotator to permit for rotation of a lower limb prosthesis and allow for a wearer to sit cross-legged.

Claims

1. Transfemoral rotator configured to couple an upper, proximal prosthetic device to a lower, distal prosthetic device, the upper, proximal prosthetic device configured to couple to a user'"'"'s limb, the transfemoral rotator comprising:

a base shell including a cylindrical central cavity therein, a bottom surface, and a button-retaining recess for holding a button for movement in a peripheral location of the base shell, the bottom surface including an opening having a diameter smaller than a diameter of the cylindrical central cavity;

an inner cylinder nested for rotation within the base shell central cavity, the inner cylinder including a lower cylindrical hub sized to protrude through the opening in the base shell and a top portion having a diameter greater than the diameter of the opening of the base shell, the inner cylinder further including a spring clip-retraining recess for receiving a U-shaped spring clip;

the U-shaped spring clip having a protrusion configured to protrude through a hole in the inner cylinder and through a hole in the base shell to lock the inner cylinder with respect to the base shell;

wherein depressing the button will unlock the inner cylinder with respect to the base shell allowing the inner cylinder to rotate freely; and

wherein the base shell receives a top plate having a first connector configured to attach to the upper, proximal prosthetic device, the lower cylindrical hub includes a second connector configured to attach to the lower, distal prosthetic device, and the top portion of the inner cylinder is enclosed within the cylindrical central cavity by the base shell and the top plate and axially supported by the base shell.

2. The transfemoral rotator of claim 1 wherein the button includes a protrusion for engaging the protrusion of the U-shaped spring clip.

3. The transfemoral rotator of claim 1 wherein the top plate includes a domed portion.

4. The transfemoral rotator of claim 1 wherein the first connector is a tapered square connector.

5. The transfemoral rotator of claim 1 wherein the first connector is a threaded screw connector.

6. The transfemoral rotator of claim 1 wherein the second connector is a set screw connector.

7. The transfemoral rotator of claim 1 wherein the second connector is a threaded screw connector.

8. The transfemoral rotator of claim 1 wherein the lower cylindrical hub and top portion of the inner cylinder are unitary.

9. The transfemoral rotator of claim 1 wherein the lower, distal prosthetic device is a prosthetic knee.

10. The transfemoral rotator of claim 1 wherein the upper, proximal prosthetic device is a socket of an amputee.