Uterine contraction detection

Details Uterine contraction detection Uterine contraction detection

1990-10-30

1992-12-08

Howell, Kyle L.

Surgery

Truss

Pad

73576, 128782, A61B 5103

Patent

active

051688794

ABSTRACT:
A system for tracing uterine contraction is disclosed. The system comprises a probe and an electronics module. The electronics module includes a drive circuit and an output section having a frequency counter. The output section also includes a strip-chart recorder driven by a frequency-to-voltage converter. The probe includes an electro-mechanical transducer which is driven at resonance by the action of the drive circuit. When the probe contacts the abdomen of a pregnant subject, changes in the mechanical impedance of bodily tissue during a contraction affect the resonant frequency of the probe and thus the frequency output by the drive circuit. This frequency can be read directly from the frequency counter and recorded on the strip-chart so that contractions can be traced.

REFERENCES:
patent: 2800647 (1957-07-01), Baerwald
patent: 3240054 (1966-03-01), Roth
patent: 4072046 (1978-02-01), Lao
Marjan Pajntar, M.D., Sc.D., Egidija Ruskar, Sc.D., and Drago Rudel, M.Sc.; "Electromyographic Observations on the Human Cervix During Labor" Am J Obstet Gynecol 1987; vol. 156, No. 3.
C. Marque, J. M. G. Duchene, S. Leclercq, G. S. Panczer, and J. Chaumont "Uterine EHG Processing for Obstetrical Monitoring" IEEE Transactions on Biomedical Engineering, vol. BME-33, No. 12 Dec. 1986.

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