Piezoelectric motivator for prosthetic devices

• US 4,895,574 A
• Filed: 06/06/1984
• Issued: 01/23/1990
• Est. Priority Date: 06/06/1984
• Status: Expired due to Fees

• Current Assignee: Larry Rosenberg
• Original Assignee: Larry Rosenberg
• Inventors: Rosenberg, Larry
• Primary Examiner(s): JAWORSKI, FRANCIS J
• Application Number:
  US06/617,715
• Time in Patent Office: 2,057 Days
• Field of Search: 128/774, 128/630, 128/1 R, 604/14, 434/272, 310/311, 310/328-333, 310/340, 310/342, 310/344, 310/345, 310/12-15, 623/14, 623/24, 623/27, 623/57
• US Class Current: 623/24
• CPC Class Codes: A61F 2/08 Muscles; Tendons; Ligaments sutures A61B17/04
• CPC Class Codes: A61F 2/72 Bioelectric control, e.g. myoelectric
• CPC Class Codes: A61F 2002/0894 Muscles non-implantable A61F2002/5066

Abstract

The invention embodies the construction and implementation of synthetic muscle elements into numerous prosthetic devices. The aforesaid synthetic muscle elements consist of piezoelectric Gels; which function to motivate artificial limbs, rotate artificial joints, institute peristaltic motion in synthetic muscle systems and perform other activities consistant with the operation of organic muscle tissue. Sensory elements and ancillary systems embodied within said synthetic muscle means are responsive to evoked potentials generated by the neurons or other impulse conducting structures of the user. The aforesaid synthetic muscle has the additional capacity to sense, measure and act in a compensatory fashion to adjust their operation to biochemicals emitted by the user including, neural humoral secretions, endocrine levels, the formation of metabolites and the tension or partial pressures of gases such as CO₂, O₂, or other substances.

Claims

1. A synthetic muscle adapted to power a prosthetic limb, comprising:

a flexible tri-layer element, said tri-layer element including a central element which is flexible in at least two dimensions;

a pair of opposed contractile elements carried by said central element and responsive to the application of electrical potentials thereto to change a physical characteristic thereof; and

,

means for selectively applying electrical potentials to each of said contractile elements and, wherein at least one of said opposed contractile elements includes a piezoelectric material embedded in a gelatinous material.

2. Apparatus according to claim 1 in which at-least-one of said opposed contractile elements exhibits bending upon application of said electrical potentials thereto.

3. Apparatus according to claim 1 in which at-least-one of said opposed contractile elements exhibits a change in volume upon application of said electrical potentials thereto.

4. Apparatus according to claim 3 in which said at-least-one contractile element is made of acrylamide.

5. Apparatus according to claim 4 in which said acrylamide is in an aqueous solution.

6. Apparatus according to claim 3 in which said at-least-one contractile element is of a polyelectrolytic material.

7. Apparatus according to claim 6 which includes, in addition, restoring means to restore the polyelectrolytic material to its original state following removal of electrical potentials therefrom.

8. Apparatus according to claim 7 in which said restoring means includes synthetic membranes adapted to be activated by laser.

9. Apparatus according to claim 8 in which said restoring means includes said laser actuated synthetic membranes coupled to sensory means for in vitro operation of said polyelectrolytic material.

10. Apparatus according to claim 9 in which said synthetic muscle is adapted to be placed in contact with the skin of a user, and bodily including means for retrieving fluids from the skin for laser analysis to determine the operation of said contractile elements forming prosthetic devices.

11. Apparatus according to claim 3 in which said at-least-one contractile element is made of polystyrene.

12. Apparatus according to claim 11 in which said polystyrene is in an non-aqueous solution.

13. Apparatus according to claim 1 in which said piezoelectric material is comminuted.

14. Apparatus according to claim 1 in which said means for selectively applying electrical potentials to each of said contractile elements includes a laser beam source for each contractile element, a photo-voltaic transducer electrically connected to its respective contractile element and fiber-optic means for optically coupling each said laser beam source to its respective photo-voltaic transducer.

15. Apparatus according to claim 1 in which said piezoelectric material is lead zirconate-titanate.

16. Apparatus according to claim 1 which includes, in addition, sensory elements carried by said contractile elements for monitoring the activities of said contractile elements.