US3565060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biopotential sensor employing integrated circuitry
Assignee: United States Department of the Navy
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Filing: 1968-08-21
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Granted: 1971-02-23
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Expires: 1988-08-21
Abstract
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.
Inventors
- 👤 William C Sipple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:46
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; Y; Y10; Y10S; Y10S128/00; Y10S128/902
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
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.
Claim 2
Dependent Claim
124 words
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.
Claim 3
Dependent Claim
124 words
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.
Claim 4
Dependent Claim
54 words
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.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |