# US 8,771,372 B1 · Lower limb prosthetic device with a wave spring

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- Number: US 8,771,372 B1
- Document ID: US8771372B1
- Status: Granted
- Kind: B1
- Application number: 13/200,689
- Filed: 2011-09-28
- Granted: 2014-07-08
- Earliest claimed: 2010-09-28
- Assignees: Stealth Composites, LLC
- Applicants: Eric W. Rubie; John S. Stites
- Inventors: Eric W. Rubie; John S. Stites
- Web page: https://patentgrep.com/patent/US8771372B1

## CPC

- A61F 2/66: Feet; Ankle joints
- A61F 2/6607: {Ankle joints}
- A61F 2002/5007: {having elastic means different from springs, e.g. including an elastomeric insert}
- A61F 2002/6657: {having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel}
- A61F 2002/6664: {Dual structures made of two connected cantilevered leaf springs}
- A61F 2002/6671: {C-shaped}
- A61F 2002/6678: {L-shaped}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

A prosthetic device including an upper member having an upper end and a lower end, a wave member having a toe end and a heel end, and a third member having a proximal end and a distal end. In the preferred prosthetic device, the toe end of the wave member is fixedly attached to the upper member and the heel end of wave member is adapted to be deflected.

## Claims

### Claim 1

A prosthetic device, said prosthetic device comprising:
(a) an upper leaf spring member, said upper leaf spring member having an upper end and a lower end;
(b) a wave leaf spring member, said wave leaf spring member having a toe end and a heel end and said wave leaf spring member disposed below the upper leaf spring member;
(c) a third leaf spring member, said third leaf spring member having a length, a first end and a second end and said third leaf spring member disposed below the wave leaf spring member;
wherein the toe end of the wave leaf spring member is fixedly attached to the upper leaf spring member at the lower end and the third leaf spring member at the first end; and wherein the heel end of wave leaf spring member is in continuous surface contact with the third leaf spring member regardless of loaded or unloaded states of the device and slidingly deflected along the third leaf spring member; and wherein the wave leaf spring member extends along a substantial portion of the length of the third leaf spring member.

### Claim 2 (depends on 1)

The prosthetic device of claim 1 wherein said device is adapted to be worn on a user's lower limb.

### Claim 3 (depends on 1)

The prosthetic device of claim 1 wherein the first end of the third leaf spring member is fixedly attached adjacent to the toe end of the wave leaf spring member.

### Claim 4 (depends on 1)

The prosthetic device of claim 1 wherein the third leaf spring member comprises a slot.

### Claim 5 (depends on 1)

The prosthetic device of claim 1 further comprising a dampener.

### Claim 6 (depends on 5)

The prosthetic device of claim 5 wherein the dampener is resilient.

### Claim 7 (depends on 5)

The prosthetic device claim 5 wherein the wave leaf spring member is in continuous contact with the dampener.

### Claim 8 (depends on 5)

The prosthetic device claim 5 wherein the dampener is disposed on the upper leaf spring member.

### Claim 9 (depends on 1)

The prosthetic device of claim 1 wherein the wave leaf spring member comprises an arch.

### Claim 10 (depends on 1)

The prosthetic device of claim 1 wherein the wave leaf spring member is resilient.

### Claim 11 (depends on 1)

The prosthetic device of claim 1 wherein the wave leaf spring member has an original configuration and is adapted to be compressed and elongated when a load is applied to the device and return to the original configuration when the load is removed from the device.

### Claim 12 (depends on 1)

The prosthetic device of claim 1 wherein the wave leaf spring member is adapted to deflect along a horizontal plane and a vertical plane.

### Claim 13 (depends on 1)

The prosthetic device of claim 1 further comprising a mounting device.