Implantable electrical device

• US 4,308,868 A
• Filed: 05/27/1980
• Issued: 01/05/1982
• Est. Priority Date: 05/27/1980
• Status: Expired due to Term

• Current Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Jhabvala, Murzban D.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US06/153,246
• Time in Patent Office: 588 Days
• Field of Search: 128/419 C, 128/419 E, 128/419 F, 128/419 R, 128/421, 128/422, 128/784, 128/785, 128/798, 128/799
• US Class Current: 607/50
• CPC Class Codes: A61N 1/326 for promoting growth of cells, e.g. bone cells
• CPC Class Codes: A61N 1/372 Arrangements in connection with the implantation of stimulators

Abstract

A fully implantable and self-contained device is disclosed composed of a flexible electrode array 10 for surrounding damaged nerves and a signal generator 12 for driving the electrode array with periodic electrical impulses of nanoampere magnitude to induce regeneration of the damaged nerves.

Claims

1. An implantable therapeutic device comprising:

a flexible electrode array for surrounding a nerve in its damaged area;

circuit means for developing a continuous series of square wave pulses of electrical energy at a predetermined frequency;

circuit means for stretching each of said square wave pulses.

circuit means for reversing the polarity of said stretched square wave pulses to provide short duration impulses of electrical energy;

means for energizing all of said circuit means; and

impedance means for applying a series of said short duration impulses of electrical energy in the nanosecond range to said array to regenerate the damaged area of said nerve.

2. The device according to claim 1 wherein said electrode array includes:

a piece of mesh material, and

a plurality of parallel spaced electrodes woven into said mesh material.

3. The device according to claim 2 wherein the center one of said electrodes is positioned directly at the area of damage of the nerve and the remaining ones of said electrodes are positioned on opposite sides of said center one about the nerve.

4. The device according to claim 3 wherein said impedance means applies said impulses to said center one of said electrodes thereby establishing a potential difference between it and said remaining ones of said electrodes.

5. The device according to claim 4 wherein said applied impulses are less than 200 nanoamperes and of about 0.1 millisecond duration.

6. The device of claim 2 wherein the electrodes of said array are transversely disposed around said nerve with an intermediate one of said parallel spaced electrodes positioned directly at said damaged area and adjacent ones of said electrodes are positioned on opposite sides of said intermediate one.

7. The device of claims 1 or 6 wherein said impedance means discontinuously applies electrical energy to said array.

8. The device according to claim 1 wherein said impulses provided by said impedance means are about 10 nanoamperes.