BIOPOTENTIAL SENSOR EMPLOYING INTEGRATED CIRCUITRY

• US 3,565,060 A
• Filed: 08/21/1968
• Issued: 02/23/1971
• Est. Priority Date: 08/21/1968
• Status: Expired due to Term

• Current Assignee: William C. Sipple
• Original Assignee: William C. Sipple
• Inventors: Sipple, William C.
• Application Number:
  US04/754,310
• Time in Patent Office: 916 Days
• US Class Current: 600/508
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: Y10S 128/902 Biological signal amplifier

Abstract

An electrocardiograph having pasteless sensor electrodes formed to directly contact the skin and thereby transfer biopotentials while maintaining a very high signal-to-noise ratio. The active electrodes are contiguously affixed to integrated circuit chips of operational amplifiers for maintaining a very low impedance to the measuring and recording instrument.

Claims

1. A biopotential sensor comprising:

electrode plates of conductive material each formed on one side to directly contact selected surfaces of the skin of a subject for transferring biopotentials thereat, said electrode plates include two active plates and a reference plate;

integrated circuit means contiguously affixed to the other sides of respective ones of said active plates and including discrete operational amplifier chips receiving said biopotentials at said active plates for producing output signals of opposite phase indicative of said active plate biopotentials for transmission; and

remote measuring means connected to said circuit means and said reference plate for receiving and indicating said output signals and reference plate biopotential. 2. A biopotential sensor according to claim 1 wherein each of said amplifier chips includes;

first transistor circuit means providing a very high shunt input impedance and producing an amplified replica of the input signal; and

second transistor circuit means receiving said replica and producing an output signal indicative thereof at a very low output impedance.

3. A biopotential sensor comprising:

electrode plates of conductive material each formed on one side to directly contact selected surfaces of the skin of a subject for transferring biopotentials thereat, said electrode plates include two active plates and a reference plate;

integrated circuit means contiguously affixed to the other sides of said active plates and including a unitary operational amplifier circuit chip on which said active plates are positioned spatially to each other on opposite sides of said reference plate receiving said active plate biopotentials for producing output signals of the opposite phase indicative of said active plate biopotentials for transmission; and

remote measuring means connected to said amplifier means and said reference plate for receiving and indicating said output signals and reference plate biopotential.

4. A biopotential sensor according to claim 3 wherein said amplifier circuit chip includes:

transistor circuit means providing a very high shunt input impedance and producing amplified replicas of the input signals; and

amplifier circuit means receiving said replicas and producing an output signal indicative of the difference thereof at a very low output impedance.