Obstetrical vacuum extractor with a pull-sensing handle grip

Details Obstetrical vacuum extractor with a pull-sensing handle grip Obstetrical vacuum extractor with a pull-sensing handle grip

2007-11-06

2007-11-06

Truong, Kevin T. (Department: 3734)

Surgery

Instruments

Obstetric or gynecological instruments

Reexamination Certificate

active

10615566

ABSTRACT:
The invention consists of a new obstetrical vacuum extractor which includes a bell-shaped fetal contact cup made of flexible material, with a hollow and substantially rigid stem, a pull-sensing handle grip attached to the end of the stem, and a tube connected with one end to the cup stem and with the other to a vacuum source. The pull-sensing grip contains electronic hardware whose purpose is to reduce the risk of fetal trauma caused by frequent cup detachment (“pop-off”) and excessive traction force, during a vacuum-assisted delivery. The hardware includes a strain gauge to measure the traction force applied to the vacuum extractor during a delivery, a speaker to alert the doctor when the traction force approaches a level sufficient to cause a fetal cup “pop-off”, and a transceiver for the wireless transmission of the traction data to a receiver connected to a lap-top computer, which generates a graphic representation of such data, and emits a warning signal when pre-set time limit of continuous cup application on the fetal scalp is reached.

REFERENCES:
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patent: 6468284 (2002-10-01), Wallace
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Hofmeyer, G.J., Gobetz, L., Sonnendecker, E.W.W., and Turner, M.J. New design rigid and soft vacuum extractor cups: a preliminary comparison of traction forces. Br. J. Obstet. Gynaecol. 1990; 97: 681-685.
Center for Devices and Radiological Health. FDA Public Health Advisory: Need for caution when using vacuum assisted delivery devices. May 21, 1998.
Plauche, W.C. Fetal cranial injuries related to delivery with Malmstrom vacuum extractor. Obstet. Gynecol. 1979; 53: 750-7.
Vacca, A.: Operative vaginal delivery: clinical appraisal of a new vacuum extraction device. Aust NZ J. Obstet. Gynaecol. 2001; 41:2:156-160.

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