Surgery – Truss – Perineal
Patent
1976-02-02
1978-05-02
Kamm, William E.
Surgery
Truss
Perineal
128 205Z, A61B 502
Patent
active
040869172
ABSTRACT:
Each ultrasonic transducer in a plurality provides a particular signal having characteristics related to the heart rate of an associated fetus. Each particular signal is processed in an associated labor room monitor and modulated on a different carrier frequency for transmission on power lines in the hospital. At a remote location, a nurses station power unit is modular with nurses station monitors. The line signals are individually demodulated in an associated one of the nurses station monitors to provide an indication of heart rate. Alternatively, the transducer assemblies can be coupled to delivery room monitors to provide an indication of heart rate.
The transducer assemblies are uniquely shielded to inhibit interference of spurious low frequency signals with the particular signals. The particular signals are partially detected in the transducer assemblies so that the assemblies can be used with both the labor room and delivery room monitors.
In the monitors, the particular signals are separated into signals each characterized by a particular fundamental frequency. A voting network elects to process that signal most indicative of the fetal heart rate.
Audio and video indications are provided to signal a heart rate beyond a preferred range and to signal a heart rate of substantially zero. If the transducer assembly becomes dislocated, the indicated zero heart rate activates means for storing the previous heart rate. When the assembly is relocated, the previous heart rate is used to avoid delay associated with regenerating heart rate information.
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patent: 3561430 (1971-02-01), Filler, Jr. et al.
patent: 3572316 (1971-03-01), Vogelman et al.
patent: 3612041 (1971-10-01), Ragsdale
patent: 3613670 (1971-10-01), Edenhofer
patent: 3710199 (1973-01-01), Cignoni, Jr.
patent: 3799147 (1974-03-01), Adolph et al.
patent: 3859984 (1975-01-01), Langley
patent: 3943918 (1976-03-01), Lewis
Ball Newton E.
Britt David L.
Burks Nathaniel W.
Kamm William E.
Medical Instruments & Technology Corp.
Roston Ellsworth R.
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