Prosthetic foot with heel and keel springs

• US 7,763,082 B1
• Filed: 10/19/2007
• Issued: 07/27/2010
• Est. Priority Date: 10/19/2007
• Status: Expired due to Fees

• Current Assignee: American Prosthetic Components Incorporated
• Original Assignee: American Prosthetic Components Incorporated
• Inventors: Curtis, Michael J.
• Primary Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US11/975,447
• Time in Patent Office: 1,012 Days
• Field of Search: 623/38, 623 47- 56
• US Class Current: 623/55
• CPC Class Codes: A61F 2/66 Feet; Ankle joints
• CPC Class Codes: A61F 2002/5009 having two or more elastomeric blocks
• CPC Class Codes: A61F 2002/6614 Feet
• CPC Class Codes: A61F 2002/6657 having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel

Abstract

A keel is provided having a spring portion and a connecting portion. The spring portion can have a split section that is divided into two sections. Each section can have a top open channel formed therein. Each channel is compressible during compression of the keel. A compression member can be placed within each channel to control or limit the amount of keel spring compression. The connecting portion is rigidly connected to a rigid center support. The top of the center support can have a threaded connector, which allows for vertically adjustable connection of an adjacent prosthetic component. A heel is also provided having a spring portion and a connecting portion. The spring portion can have a top open channel formed therein. The channel is compressible during compression of the heel. A compression member can be placed within the channel to control or limit the amount of heel spring compression.

Claims

1. A prosthetic foot comprising:

a rigid center support having a top with a connector, a bottom, a front and a rear;

a heel having an upward oriented heel channel formed therein, wherein said heel channel extends fully across said heel and compresses during flexing of said heel;

a keel having an upward oriented keel channel formed therein, wherein said keel channel extends fully across said keel and compresses during flexing of said keel, and said keel is connected to said rigid center support at said rear of said center support, said keel having a first side piece and a second side piece with an opening there between, said first side piece having a first side piece channel formed therein and said second side piece having a second side piece channel formed therein, said first side piece channel and said second side piece channel comprising said upward oriented keel channel.

2. The prosthetic foot of claim 1 further comprising:

a first compression member received within said heel channel for decreasing the amount and rate of flex of said heel; and

a second compression member received within said keel channel for decreasing the amount and rate of flex of said keel.

3. The prosthetic foot of claim 2 wherein:

the selected dimensions of said heel channel is one of round, square, trapezoidal and series of slots; and

the selected dimensions of said keel channel is one of round, square, trapezoidal and series of slots.

4. The prosthetic foot of claim 2 wherein said first compression member is made of urethane with a first selected stiffness and said second compression member is made of urethane with a second selected stiffness.

5. The prosthetic foot of claim 2 wherein said first compression member and said second compression member, respectively, have a stiffness that is controlled by varying the air pressure within said first compression member and said second compression member.

6. The prosthetic foot of claim 1 wherein:

said first side piece channel receives a compression member of a first stiffness; and

said second side piece channel receives a compression member of a second stiffness.

7. The prosthetic foot of claim 1 wherein said heel is connected to said rigid center support at said front of said center support, said heel passing between said first side piece and said second side piece of said keel.

8. The prosthetic foot of claim 1 wherein said connector comprises threads, whereby an adjacent component is vertically adjustable relative said heel and said keel.