Monitoring the physiological phenomena of childbirth with ultrasound
Abstract
Abstract AN ULTRASONIC APPARATUS FOR MONITORING, DURING CHILDBIRTH, THE PHYSIOLOGICAL PHENOMENA OF FETAL HEARTBEAT, CREVICAL DILATATION AND UTERINE CONTRACTIOIN. FETAL HEARTBEAT IS MONITORED BY INDICATING CHANGES IN THE REFERENCY OF ULTRASONIC WAVES PASSING THROUGH THE FETUS DUE TO THE DOPPLER EFFECT CAUSED BY MOVEMENTS OF THE FETAL HEART OR BLOOD. UTERINE CONTRACTION IS MONITORED BY INDICATING CHANGES IN TRANSIT TIME OF PULSES OF ULTRASONIC ENERGY. TO MEASURE CERVICAL DILATATION, TWO REFLECTORS ARE CLIPPED TO THE MOUTH OF THE CERVIX AND ULTRASONIC PULSES FROM AN EXTERNAL TRANSDUCER ARE DIRECTED TO THE REFLECTORS. THE TRANSIT TIME DIFFERENCE BETWEEN THE REFLECTED SIGNALS INDICATES THE DILATATION.
Inventors
- 👤 Jerry R Estes
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |