Prosthetic foot

• US 20050033451A1
• Filed: 08/07/2003
• Published: 02/10/2005
• Est. Priority Date: 08/07/2003
• Status: Abandoned Application

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Original Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Inventors: Patel, Jnyan, Auxier, James, Aigner, Michael, Maltese, Jim
• Application Number:
  US10/637,810
• Publication Number:
  US 20050033451A1
• Time in Patent Office: Days
• US Class Current: 623/53
• CPC Class Codes: A61F 2/66 Feet; Ankle joints
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30365 with additional means for limiting said rotation
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/5018 for adjusting angular orientation
• CPC Class Codes: A61F 2002/5043 with rotation-limiting stops, e.g. projections or recesses
• CPC Class Codes: A61F 2002/5055 Reinforcing prostheses by embedding particles or fibres during moulding or dipping, e.g. carbon fibre composites
• CPC Class Codes: A61F 2002/6621 Toes
• CPC Class Codes: A61F 2002/6642 Heels
• CPC Class Codes: A61F 2002/665 Soles
• CPC Class Codes: A61F 2002/6664 Dual structures made of two connected cantilevered leaf springs
• CPC Class Codes: A61F 2002/6671 C-shaped
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

Features for a high performance prosthetic foot are provided in a package suitable for use with Symes and reverse-Symes amputees. The foot has a very low profile despite incorporating ankle-type torsional features complete with biasing. Other optional features are presented by way of a dual-rate padding spring system, that convincingly allow for both walking and running (together with related tasks like jumping) by way of a single prosthetic setup. Additional features may be provided in the padding springs directed toward more natural foot movement and response. The foot may be provided alone, in connection with a prosthetic socket and be bare or encased in order to appear more natural.

Claims

1. A prosthetic foot system, said system comprising:

a foot, wherein said foot comprises a base having a rear section for attachment to a socket, a forward section for attachment to at least one padding spring and an arch section spanning said front and rear sections,

wherein said at least one padding spring extends forward and rearward of said forward base section,

wherein said arch and said base rear section are configured to provide clearance for upward deflection of said at least one padding spring opposite thereto, and

wherein said rear section comprises a recess serving as a stator having a plurality of vanes, a rotor having a plurality of vanes received within said recess, and a plurality of spring elements, each said spring element between opposing rotor and stator vanes thereby providing torsional features for said foot.

2. The system of claim 1, wherein said foot further comprises an interface member for attachment between said rotor and said socket.

3. The system of claim 2, further comprising said socket attached to said interface member.

4. The system of claim 1, wherein sad at least one padding spring consists of an upper and lower leaf springs.

5. The system of claim 4, wherein said springs are configured so only said lower spring is used in walking.

6. The system of claim 4, wherein said springs are configured so said upper spring provides supplemental force to said lower spring in running or jumping.

7. The system of claim 4, wherein said upper spring has ends inset from ends of said lower spring.

8. The system of claim 1, wherein said at least one padding spring has at least one of a split toe or a split heel.

9. The system of claim 1, wherein said at least one padding spring has at least one lateral extension.

10. The system of claim 1, wherein said foot, and an interface member for connecting said foot to a socket has a height of between about 1 and about 2 inches.

11. A prosthetic foot comprising:

a base having a rear section for attachment to a socket, a forward section for attachment to at least one padding spring and an arch section spanning said front and rear sections,

said at least one padding spring extending forward and rearward of said forward base section,

said arch and said base rear section being configured to provide clearance for upward deflection of said at least one padding spring opposite thereto, and

said rear section comprising a stator having a plurality of vanes, a rotor received at least partially within said stator and having a plurality of vanes, and a plurality of spring elements, each said spring element between opposing rotor and stator vanes thereby providing torsional features for said foot.

12. The prosthetic foot of claim 11, wherein said stator is formed in a single piece of base material, together with said arch and forward sections of said base.

13. The prosthetic foot of claim 11, further comprising an interface member adapted to be affixed to said rotor and for attachment to a socket.

14. The prosthetic foot of claim 11, having a height of between about 1 and about 2 inches.

15. The prosthetic foot of claim 11, wherein sad at least one padding spring consists of an upper and lower leaf springs.

16. The system of claim 15, wherein said springs are configured so only said lower spring is used in walking.

17. The system of claim 15, wherein said springs are configured so said upper spring provides supplemental force to said lower spring in running or jumping.

18. The system of claim 15, wherein said upper spring has ends inset from ends of said lower spring.

19. The system of claim 11, wherein said at least one padding spring has at least one of a split toe or a split heel.

20. The system of claim 11, wherein said at least one padding spring has at least one lateral extension.