Surgery – Means for introducing or removing material from body for... – Gas application
Patent
1993-10-12
1995-08-08
Hindenburg, Max
Surgery
Means for introducing or removing material from body for...
Gas application
128748, A61M 1300
Patent
active
054394414
ABSTRACT:
Insufflation gas is introduced into a body cavity to be inflated. The gas flow is stopped, and the pressure in the body cavity is measured at plural, discrete intervals of time. Pressure reading values are stored in memory for a predetermined number n of the most recent pressure reading values. These stored pressure reading values are compared to one another to determine the pressure differential between the highest and lowest pressure values. New pressure readings are continually made at the time intervals, and the new pressure reading values replace the oldest pressure readings such that the most recent pressure reading values are stored in memory. Pressure measurements are continued if the maximum pressure differential in the predetermined number n of the most recent stored pressure reading values is less than the predetermined pressure differential. However, if the differential is less than a predetermined pressure differential, then it is determined that the pressure oscillations in the body cavity have subsided, and the nominal body cavity pressure is determined. If the measured pressure is below a preset target level of insufflation, additional gas may be introduced into the body cavity, and then pressure measurements may be resumed.
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patent: 4676774 (1987-06-01), Semm et al.
patent: 4874362 (1989-10-01), Wiest et al.
patent: 4966578 (1990-10-01), Baier et al.
patent: 5013294 (1991-05-01), Baier
patent: 5047010 (1981-09-01), Ams et al.
patent: 5246419 (1993-09-01), Absten
Carlisle Steven N.
Grimsley Richard L.
Hindenburg Max
Snowden-Pencer, Inc.
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