Prosthetic foot with a processor to manage energy return of adjustable heel and keel springs

• US 7,766,974 B2
• Filed: 06/26/2008
• Issued: 08/03/2010
• 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:
  US12/146,617
• Publication Number:
  US 20090105845A1
• Time in Patent Office: 768 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 2/70 electrical
• CPC Class Codes: A61F 2/74 fluid , i.e. hydraulic or pneumatic
• CPC Class Codes: A61F 2/741 using powered actuators, e.g. stepper motors or solenoids
• 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 2002/5009 having two or more elastomeric blocks
• CPC Class Codes: A61F 2002/503 for adjusting elasticity, flexibility, spring rate or mechanical tension
• CPC Class Codes: A61F 2002/6621 Toes
• CPC Class Codes: A61F 2002/6642 Heels
• CPC Class Codes: A61F 2002/6671 C-shaped
• CPC Class Codes: A61F 2002/704 computer-controlled, e.g. robotic control
• CPC Class Codes: A61F 2002/7635 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws

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 variably adjustable compression member can be provided. 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 variably adjustable compression member can be placed within the channel. A processor can be provided for controlling the amount of compression of each compression member.

Claims

1. A prosthetic foot comprising:

a rigid center support having a top with a connector, a bottom, a keel washer and a heel washer, wherein said top is removably connected to said bottom;

a keel stationarily connected to said rigid center support at a single keel position between said bottom and said keel washer, said keel having an adjustable flexibility and having a keel top and comprises a keel channel open to said keel top and oriented laterally across said keel, wherein the flexibility of said keel is increased at said keel channel;

a heel stationarily connected to said rigid center support at a single heel position between said bottom and said heel washer, said heel having an adjustable flexibility and having a heel top and comprises a heel channel open to said heel top and oriented laterally across said heel, wherein the flexibility of said heel is increased at said heel channel; and

a processor that is electronically operable, wherein said processor selects the flexibility of said keel and said heel.

2. The prosthetic foot of claim 1 further comprising:

a first variably adjustable compression member stationarily received within said keel channel; and

a second variably adjustable compression member stationarily received within said heel channel.

3. The prosthetic foot of claim 2 wherein:

said keel comprises a first section and a second section, said first section comprising a first section channel and said second section comprising a second section channel, said first section channel receiving said variably adjustable first compression member, and said second section receiving a third variably adjustable compression member; and

said first variably adjustable compression member has a stiffness and said second variably adjustable compression member has a stiffness, said stiffness of said first variably adjustable compression member being independent of said stiffness of said second variably adjustable compression member.

4. The prosthetic foot of claim 3 wherein said first variably adjustable compression member, said second variably adjustable compression member and said third variably adjustable compression member are each inflatable.

5. The prosthetic foot of claim 4 wherein said foot comprises a sensor, said sensor communicating a condition to said processor whereby said processor determines the selected amount of inflation for each of first variably adjustable compression member, said second variably adjustable compression member and said third variably adjustable compression member.

6. The prosthetic foot of claim 5 wherein said sensor senses heel-strike of said prosthetic foot.