Patent US3667476A successfully refreshed from Google Patents.
US3667476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for monitoring body temperature and controlling a heating device to maintain a selected temperature
Assignee: Bio Data Corp
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Filing: 1970-04-27
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Granted: 1972-06-06
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Expires: 1990-04-27
Abstract
Abstract A servocircuit measures and controls temperature. A thermistor detects temperature and a controller controls a heating device to maintain a selected temperature in a living organism. The danger of electric shock is removed by using field effect transistors to isolate the thermistor from hazardous voltage currents. Alarm and control circuitry eliminates danger of overheating.
Inventors
- 👤 Henry Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/01; A61F; A61F7/00; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; A61F2007/0086
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature, comprising: a bridge circuit, temperature sensitive means connected in one leg of said bridge circuit, temperature selection means connected in another leg of said bridge circuit, a heater for applying heat to the organism whose temperature is being measured and controlled, switch means for controlling said heater, control means for actuating said switch means, said control means being responsive to a measured change in temperature to actuate said switch means, isolation means to electrically isolate said temperature sensitive means and said bridge circuit from said switch control means, whereby said temperature sensitive means and said bridge circuit may be operated at a low voltage that is not hazardous to the organism and the remainder of said circuit may use higher, suitable operating voltages, means to detect an open circuit condition in said temperature sensitive means, and an open circuit switch means responsive to said open circuit detection means, said open circuit switch means being effective to shut down said heater.
Claim 2
Dependent Claim
176 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature, comprising: a bridge circuit, temperature sensitive means connected in one leg of said bridge circuit, temperature selection means connected in another leg of said bridge circuit, a heater for applying heat to the organism whose temperature is being measured and controlled, switch means for controlling said heater, control means for actuating said switch means, said control means being responsive to a measured change in temperature to actuate said switch means, isolation means to electrically isolate said temperature sensitive means and said bridge circuit from said switch control means, whereby said temperature sensitive means and said bridge circuit may be operated at a low voltage that is not hazardous to the organism and the remainder of said circuit may use higher, suitable operating voltages, means to detect an open circuit condition in said temperature sensitive means, and an open circuit switch means responsive to said open circuit detection means, said open circuit switch means being effective to shut down said heater.
Claim 3
Dependent Claim
88 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature in accordance with claim 1 including temperature measuring means for directly measuring the temperature of said organism, and second isolation means to electronically isolate said temperature sensitive means and bridge circuit from said temperature measuring means, whereby said temperature sensitive means and bridge circuit may be operated at a low voltage that is not hazardous to the organism and the temperature measuring means may be operated at a higher, suitable operating voltage.
Claim 4
Dependent Claim
32 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature in accordance with claim 1 wherein said isolation means includes at least one field effect transistor.
Claim 5
Dependent Claim
31 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature in accordance with claim 2 wherein said second isolation means includes a field effect transistor.
Claim 6
Dependent Claim
53 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature in accordance with claim 1 including an alarm circuit connected across said bridge circuit, said alarm circuit being responsive to a predetermined absolute value of variation in temperature from the temperature selected by said temperature selection means.
Claim 7
Dependent Claim
72 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature in accordance with claim 5 including third isolation means to electrically isolate said alarm circuit from said temperature sensitive means and bridge circuit, whereby said temperature sensitive means and bridge circuit may be operated at a low voltage that is not hazardous to the organism and the alarm circuit may use a higher, suitable operating voltage.
Claim 8
Dependent Claim
31 words
Apparatus for detecting temperature in vivo and controlling a heater in response to the detected temperature in accordance with claim 6 wherein said third isolation means includes a field effect transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |