Surgery – Truss – Pad
Patent
1990-09-17
1993-06-29
Jaworski, Francis
Surgery
Truss
Pad
12866206, A61B 812
Patent
active
052224856
ABSTRACT:
An obstetrical device is provided for use during labor and childbirth to determine and monitor accurately the position of a fetal head and the configuration of the cervix using ultrasonographic techniques. The device comprises an elongated inflatable latex rubber sac closed at one end by a latex rubber diaphragm that is supported by a resilient peripheral ring. In use, the device is inserted into the birth canal with a portion of the sac positioned in the vaginal cavity, a portion extending through the cervical canal and with the diaphragm positioned in the uterus adjacent the fetal head. The diaphragm is maintained in the uterus by the flexible peripheral ring, which has a diameter greater than that of the cervical canal. With the device thus positioned, it is inflated with a saline solution causing it to expand, bear against, and take the shape of the vaginal cavity, uterus, and fetal head. A longitudinal ultrasonographic image taken from just outside the vagina, then, clearly reveals the interface between the saline solution and surrounding tissue and thus the configuration of the cervix and station of the fetal head for accurate measurement directly from the ultrasound image.
REFERENCES:
patent: 4579123 (1986-04-01), Chen et al.
patent: 4593699 (1986-06-01), Poncy et al.
patent: 4722346 (1988-02-01), Chen
patent: 4757823 (1988-07-01), Hofmeister et al.
Taylor, W. B. et al "A High-Resolution Transrectal Ultrasonographic System", UTS in Med & Biol., vol. 5, pp. 129-138 1979.
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