Physiological monitoring system
Abstract
Abstract ELECTRICAL APPARATUS FOR SIMULTANEOUSLY MONITORING RESPIRATION AND CARDIAC ACTION FROM A COMMON PAIR OF BIOPOTENTIAL ELECTRODES APPLIED TO A LIVING SUBJECT, TO OBTAIN INDEPENDENT RESPIRATION AND EGG (CARDIAC) ELECTRICAL OUTPUT SIGNALS. THE RESPIRATION SIGNAL RESPRESENTING TIDAL VOLUME IMPEDANCE CHANGES IN THE LUNGS OF THE SUBJECT MODULATES A CONSTANT CURRENT HIGH FREQUENCY CARRIER SIGNAL AND IS SUBSEQUENTLY AMPLIFIED, DEMODULATED AND FILTERED IN A RESPIRATION CHANNEL. EGG POTENTIALS EXISTING BETWEEN THE COMMON PAIR OF BIOPOTENTIAL ELECTRODES ARE FILTERED FROM THE MODULATED HIGH FREQUENCY CARRIER VOLTAGE AND THE FILTERED EGG SIGNAL IS THEN USED TO MODULATE A HIGH FREQUENCY CARRIER SIGNAL ORIGINATING FROM THE SAME SOURCE SUPPLYING THE RESPIRATION CHANNEL. THE EGG MODULATED CARRIER IS SUBSEQUENTLY AMPLIFIED, DEMODULATED AND FILTERED IN A CARDIAC CHANNEL.
Inventors
- 👤 Andrew S Williams
Bibliographic Details
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |