Iontophoretic and electrical tissue stimulation device

• US 4,456,012 A
• Filed: 02/22/1982
• Issued: 06/26/1984
• Est. Priority Date: 02/22/1982
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Lattin, Gary A.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Shein, Mitchell J.
• Application Number:
  US06/351,104
• Time in Patent Office: 855 Days
• Field of Search: 128/421-423, 128/420 R, 604/20
• US Class Current: 607/3
• CPC Class Codes: A61N 1/325 for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body electrodes for external use A61N1/0428
• CPC Class Codes: A61N 1/36034 specified by the stimulation parameters

Abstract

An electrotherapeutic device for selectively providing iontophoretic or biphasic stimulation to electrodes for introducing iontophoretic substances and for delivering biphasic current to body tissue, comprising timing circuits (120, 270, 280) for providing preselected stimulation intervals, and circuits (10, 30, 50) for providing iontophoretic and biphasic stimulation (151, 152) to the electrodes in response to the timing circuits and a user actuated input (92). The timing circuits may provide alternating intervals of biphasic and iontophoretic stimulation and optionally include a user-actuated one-shot timer (120) for interrupting biphasic stimulation and providing iontophoretic stimulation for a predetermined interval.

Claims

1. An electrotherapeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation to body tissue, comprising:

generating means operative in a first mode for producing electrical tissue stimulation and operative in a second mode for producing iontophoretic current;

a pair of output terminals for connection to electrodes, said output terminals connected to said generating means; and

means for controlling the mode of operation of said generating means for causing either iontophoretic current or electrical tissue stimulation to be delivered to the terminals for application to body tissue.

2. A device according to claim 1 wherein said control means includes timing means having a user actuated switch for causing said generating means to operate in said second mode for a predetermined interval, and means for causing sid generating means to operate in said first mode between intervals of operation in said second mode.

3. A device according to claim 1 wherein said control means includes timing means for causing said generating means to automatically alternate between said modes operation, each of said modes lasting a predetermined interval.

4. A device according to claim 1 including indicating means connected to said control means for providing a user detectable signal indicative of which mode said generating means is operating in.

9. A device according to claim 1 or 5 wherein said means for generating electrical tissue stimulation produces biphasic current.

5. An electrotherapeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation to body tissue, comprising:

electrical tissue stimulation generating means;

iontophoretic current generating means;

means for connecting said generating means to common output terminals; and

control means connected to both of said generating means for actuating either of said generating means whereby iontophoretic current or electrical tissue stimulation may be selectively delivered to said terminals for application to body tissue.

6. A device according to claim 5 wherein said control means includes a user controlled timing means for actuating said iontophoretic generating means for a predetermined time interval, and means for actuating said electrical tissue stimulation generating means at the end of said timed interval whereby manually initiated timed intervals of iontophoretic current may be delivered to body tissue, after which the delivery of electrical tissue stimulation is automatically reinitiated.

7. A device according to claim 5 wherein said control means includes timing means for actuating said iontophoretic current generating means for a first predetermined time interval and for actuating said electrical tissue stimulation generating means for a second predetermined time interval beginning at the end of said first interval, said control means further including means for reactuating said iontophoretic current generating means at the end of said second interval whereby intervals of iontophoretic current interspersed with intervals of electrical tissue stimulation are delivered to said output terminals.

8. A device according to claim 5 including indicating means connected to said control means for providing a user detectable signal indicating which generating means is actuated.

10. An electrotherapeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation body to tissue, comprising:

generating means having means operative in a first mode for producing electrical tissue stimulation and means operative in a second mode for producing iontophoretic current;

a pair of output terminals for connection to electrodes, said output terminals receiving the output of said generating means; and

control means for causing said generating means to normally operate in said first mode and for causing said generating means to operate in said second mode for a predetermined time interval and then automatically revert to said first mode of operation.

11. A device according to claim 10 wherein said control means includes timing means for causing said generating means to automatically alternate between said operative modes, each mode lasting for a predetermined time interval.

12. An electrotherapeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation body to tissue, comprising:

generating means having means operative in a first mode for producing electrical tissue stimulation and means operative in a second mode for producing iontophoretic current;

a pair of output terminals for connection to electrodes, said output terminals receiving the output of said generating means; and

control means having first means for causing said generating means to normally operate in said first mode and for selectively causing said generating means to operate in said second mode for a predetermined time interval and then automatically revert to said first mode of operation, and having second means for causing said generating means to automatically alternate between said modes of operating, each of said modes lasting an independently controlled predetermined time interval.

13. An electrotherpeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation to body tissue, comprising:

generating means having means operative in a first mode for producing electrical tissue stimulation and having means operative in a second mode for producing electrical tissue stimulation superimposed on an iontophoretic current;

a pair of output terminals for connection to electrodes, said output terminals receiving the output of said generating means; and

means for controlling the mode of operation of said generating means.

15. A device according to claim 13 or 14 wherein said control means includes timing means having a user actuated switch for causing said generating means to operate in said second mode for a predetermined time interval and means for causing said generating means to operate in said second mode between intervals of operation in said first mode.

16. A device according to claim 13 or 14 wherein said control means includes timing means for causing said generating means to automatically alternate between said modes operation, each of said modes lasting a predetermined time interval.

17. A device according to claim 13 or 14 including indicating means connected to said control means for providing a user detectable signal indicative of which mode said generating means is operating in.

14. An electrotherapeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation to body tissue, comprising:

generating means operative in a first mode for producing electrical tissue stimulation and operative in a second mode for producing electrical tissue stimulation superimposed on an iontophoretic current;

a pair of output terminals for connection to electrodes, said output terminals connected to said generating means; and

means for controlling the mode of operation of said generating means for causing either electrical tissue stimulation superimposed on an iontophoretic current or nonpolarized electrical tissue stimulation to be delivered to the terminals for application to body tissue.

18. An electrotherapeutic device for use with electrodes adaptable for introducing iontophoretic substances and delivering electrical tissue stimulation to body tissue, comprising:

electrical tissue stimulation generating means;

iontophoretic current generating means;

means for connecting said generating means to common output terminals; and

control means operatively connected for actuating said generating means either individually or simultaneously whereby iontophoretic current or electrical tissue stimulation or electrical tissue stimulation superimposed on an iontophoretic current may be selectively delivered to said terminals for application to body tissue.

19. A device according to claim 18 wherein said control means includes a user controlled timing means for selectively actuating said iontophoretic generating means or said electrical tissue stimulation generating means for predetermined time intervals.

20. An electrotherapeutic device for use with electrodes adaptable for introducing ionic substances and electrical tissue stimulation to body tissue, comprising:

presettable timing means for producing alternating first and second timing signals having predetermined durations;

oscillator means actuated by said first timing signal for producing periodic pulses of adjustable frequency;

modulation means connected to said oscillator means for modulating the duty cycle of said pulses;

biphasic current generating means actuated by said first timing signal and connected to receive said modulated pulses for producing biphasic current at a frequency and intensity respectively proportional to the frequency and duty cycle of said pulses;

iontophoretic current generating means actuated by said second timing signal for producing iontophoretic current at an adjustable level; and

output means connected to said biphasic current generating means and said iontophoretic current generating means for alternately delivering biphasic or iontophoretic current to said electrodes according to said timing signals.

21. A device according to claim 20 wherein said timing means includes a user actuated switch and a oneshot timer responsive to said switch for causing iontophoretic current to be channeled to said electrodes for a predetermined interval, and means for deactivating said oscillator means during said interval.