Reducing artifact in bioelectric signal monitoring

• US 5,795,293 A
• Filed: 12/29/1995
• Issued: 08/18/1998
• Est. Priority Date: 12/29/1995
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Carim, Hatim M., Burton, Scott A.
• Primary Examiner(s): Bahr, Jennifer
• Assistant Examiner(s): YARNELL, BRYAN KEITH
• Application Number:
  US08/586,011
• Time in Patent Office: 963 Days
• Field of Search: 128/639-641, 128/643, 128/644, 128/734, 128/696, 128/700, 128/898, 607/2, 607/75, 607/50, 607/149, 607/100, 607/98, 607/99, 607/72, 607/66
• US Class Current: 600/372
• CPC Class Codes: A61B 2562/0215 Silver or silver chloride containing
• CPC Class Codes: A61B 2562/0217 Electrolyte containing
• CPC Class Codes: A61B 5/325 Preparing electrode sites, e.g. by abrasion
• CPC Class Codes: A61B 5/411 Detecting or monitoring allergy or intolerance reactions to an allergenic agent or substance

Abstract

Systems and methods of conditioning skin to reduce artifact in bioelectric signal monitoring by passing electrical energy into the skin through the medical electrodes. An electrode having electrolyte including an agent to reduce skin discomfort.

Claims

1. A method of conditioning skin to reduce artifact in bioelectric signal monitoring through an electrode on skin comprising the steps of:

a) placing the electrode on the skin; and

b) conditioning the skin beneath the electrode by passing electrical energy at a rate of about 5 μ

A/cm² to about 5 mA/cm² through the electrode and into the skin using a ramped conditioning current to reduce skin impedance.

2. The method according to claim 1, further comprising a step of monitoring a bioelectric signal through the electrode.

3. The method according to claim 2, wherein the electrical energy is passed for about 1 second to about 2 minutes.

4. The method according to claim 1, wherein the step of passing electrical energy comprises passing electrical energy at a rate of about 100 μ

A/cm² to about 1.5 mA/cm².

5. The method according to claim 1, wherein the ramped conditioning current also includes a ramping down of amplitude towards zero.

6. The method according to claim 1, wherein the step of conditioning further comprises passing a electric energy at a first rate through the electrode for a first predetermined time interval followed by a second predetermined rest interval during which the amplitude of electric current passing through the electrode is held at about zero.

7. The method according to claim 6, further comprising the step of passing a background current through the electrode and into the skin, the background current comprising an anodic direct current.

8. The method according to claim 7, wherein the background current has a maximum amplitude of up to about 10 μ

A/cm².

9. The method according to claim 1, wherein the electrical energy is supplied by a current having a waveform chosen from the group consisting of direct current, square waves, rectangular waves, saw-toothed waves, sinusoidal waves which do not reverse polarity, rectified sinusoidal waves, and arbitrary/random waveforms.

10. The method according to claim 1, wherein the electrical energy is chosen from the group consisting of anodic direct current and cathodic direct current.