Transcutaneous nerve stimulator for treatment of sympathetic nerve dysfunction

• US 4,917,092 A
• Filed: 07/13/1988
• Issued: 04/17/1990
• Est. Priority Date: 07/13/1988
• Status: Expired due to Fees

• Current Assignee: Medical Designs, Inc. (Sparta Surgical Corp.)
• Original Assignee: Medical Designs, Inc. (Sparta Surgical Corp.)
• Inventors: Southworth, Michael H., Todd, Gregory A.
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/218,722
• Time in Patent Office: 643 Days
• Field of Search: 128/421, 128/422, 128/423 R
• US Class Current: 607/46
• CPC Class Codes: A61N 1/025 Digital circuitry features of electrotherapy devices, e.g. memory, clocks, processors
• CPC Class Codes: A61N 1/36021 for treatment of pain

Abstract

A transcutaneous nerve stimulator and method for using the same are provided for use in treating sympathetic nerve dysfunction. The device includes an analog-to-digital and digital-to-analog converter, a non-volatile random access memory, a preprogrammed microprocessor with masked memory and two output channels with respective jacks for electrodes. A dual line data bus interconnects the microprocessor, converter and RAM.

Claims

1. A method for using one T.E.N.S. unit for efficient suppression of pain associated with sympathetic nerve dysfunction which comprises the steps of

generating pulses,

modulating the pulse width and amplitude of the generated pulses over a modulation cycle to vary in a prescribed manner so as to stimulate within each modulation cycle the autonomic and central nervous systems of said person, such that said sympathetic nerve dysfunction is treated with a low frequency of pulses while through the utilization of strength-duration modulation at higher pulse rates, said person'"'"'s nociceptors are addressed, such that said autonomic nervous system is stimulated for more than 5% of the amount of time as said central nervous system, and

conveying said pulses to a person experiencing pain associated with sympathetic nerve dysfunction.

2. The method according to claim 1, wherein said modulation cycle features generated pulses of varying values of pulse widths and amplitudes, said values of pulse widths increasing when said values of amplitude decrease and said pulse width values decreasing when said amplitude values increase, said generated pulses having a value for its pulse rate at its minimum when said value for pulse width is at its maximum.

3. The method according to claim 2, wherein said stimulation is antidromic and orthodromic.

4. The method according to claim 2, wherein said generated pulses are of specific amplitude and pulse width values which if plotted would approximate the strength-duration curve in the maximum sensory threshhold.

5. The method according to claim 2, wherein said modulation cycle occurs in cycles of twelve seconds.

6. The method according to claim 5, wherein said pulse rate decreases to 10% of its value at the maximum of said cycle.

7. A transcutaneous nerve stimulating device for efficient treatment of sympathetic nerve dysfunction comprising

means for generating a plurality of pulses,

amplitude, pulse width and rate modulation control means, which cause the amplitude, pulse width and rate of the generated pulses to vary in a prescribed manner which permits the stimulation of the autonomic and central nervous systems by generated pulses, said amplitude control means interacting with said pulse width control means so as to maintain a mode featuring strength-duration modulation such that the values associated with pulse width and amplitude vary inversely and with the pulse rate being at its minimum when said pulse width is at its maximum, and

means for conveying said pulses to a person experiencing pain associated with sympathetic nerve dysfunction.

8. A device according to claim 7, wherein said generated pulses are of specific amplitude and pulse width values which if plotted would approximate the strength-duration curve in the maximum sensory threshhold.

9. A device according to claim 7, wherein said strength-duration modulation occurs in cycles of twelve seconds.

10. A device according to claim 7, wherein said mode includes rate modulation from a maximum value, said pulse rate decreasing to 10% of its maximum value.

11. A method for using one T.E.N.S. unit for efficient suppression of pain associated with sympathetic nerve dysfunction which comprises the steps of

generating pulses,

modulating the pulse width and amplitude of the generated pulses over a modulation cycle to vary in a prescribed manner so as to stimulate within each modulation cycle the autonomic and central nervous systems of said person, the stimulation being such that said sympathetic nerve dysfunction is treated with a low frequency of pulses while addressing, without manual resetting of treatment modes, a person'"'"'s nociceptors through the utilization of strength-duration modulation at higher pulse rates, and conveying said pulses to a person experiencing pain associated with sympathetic nerve dysfunction.

12. The method of claim 11 wherein stimulating said autonomic and central nervous systems occurs during the same treatment time.

13. The method of claim 12 wherein stimulating said autonomic and central nervous systems occurs during the same mode.

14. The method of claim 11 wherein said stimulation of both the autonomic and the central nervous systems occurs while said one T.E.N.S. unit is modulating.