Electrical body stimulator

• US 4,230,121 A
• Filed: 01/29/1979
• Issued: 10/28/1980
• Est. Priority Date: 01/29/1979
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Stanton, David J.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US06/007,306
• Time in Patent Office: 638 Days
• Field of Search: 128/419 PG, 128/421, 128/422
• US Class Current: 607/72
• CPC Class Codes: A61N 1/36021 for treatment of pain
• CPC Class Codes: A61N 1/378 Electrical supply

Abstract

An electrical body stimulator having particular utility for transcutaneous electronic nerve stimulation. Circuitry is provided which delivers a driving pulse, the stimulator output circuitry being responsive to the driving pulse duration for establishing at least one stimulation signal parameter in accordance therewith. In a preferred embodiment, the driving pulse generator includes an energy storage device and an oscillating power supply connected to the storage device for alternately charging and discharging the storage device. A dual state device responds to the charge level of the energy storage device and changes state in response to predetermined changes in the energy storage device charge level. The charging rate is alterable to alter the duration of the driving pulse.

Claims

1. In an electrical body stimulator of the type having driving pulse generating means and driving pulse responsive means, including output means, for providing body stimulation signals, the improvement wherein said driving pulse generating means comprises:

energy storage means;

oscillating power supply means connected to said energy storage means for alternately charging and discharging said energy storage means; and

threshhold means including dual state means responsive to the charge level of said energy storage means for changing state in response to predetermined changes in said energy storage means charge, said driving pulse responsive means comprising means responsive to the period between changes of state of said dual state means for establishing the stimulation signal amplitude in accordance therewith.

2. The stimulator of claim 1 wherein said predetermined changes in charge level comprises the charging of said energy storage means to a level above a preselected level.

3. The stimulator of claim 1 further comprising means for altering the charging rate of said energy storage means.

4. The stimulator of claim 3 wherein said energy storage means comprises capacitance means, said charging rate altering means comprising variable resistance means.

5. The stimulator of claim 4 wherein said dual state threshhold means comprises Schmitt trigger means.

6. The stimulator of claim 5 wherein said oscillating power supply means comprises square-wave generator means.

7. The stimulator of claim 6 wherein said predetermined changes in charge level comprise a charging of said energy storage means to a level above a preselected level.

8. The stimulator of claim 1 wherein said energy storage means comprises capacitance means.

9. The stimulator of claim 1 wherein said dual state threshhold means comprises Schmitt trigger means.

10. The stimulator of claim 1 wherein said oscillating power supply means comprises square-wave generator means.