Surgical insufflation system with improved determination of body cavity pressure
First Claim
1. A process for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising the steps of:
- supplying insufflation gas into the body cavity;
discontinuing the supply of gas into the body cavity;
measuring pressure in communication with the body cavity to obtain pressure reading values taken at plural discrete intervals of time when no gas is being introduced into the body cavity to obtain a plurality of pressure reading values;
storing a plurality of said pressure reading values;
comparing a predetermined number n of the most recent pressure reading values to determine the pressure differential between a highest and a lowest pressure reading value therein;
determining a nominal body cavity pressure when said pressure differential becomes less than a predetermined pressure differential.
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Accused Products
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.
73 Citations
21 Claims
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1. A process for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising the steps of:
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supplying insufflation gas into the body cavity; discontinuing the supply of gas into the body cavity; measuring pressure in communication with the body cavity to obtain pressure reading values taken at plural discrete intervals of time when no gas is being introduced into the body cavity to obtain a plurality of pressure reading values; storing a plurality of said pressure reading values; comparing a predetermined number n of the most recent pressure reading values to determine the pressure differential between a highest and a lowest pressure reading value therein; determining a nominal body cavity pressure when said pressure differential becomes less than a predetermined pressure differential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Insufflation apparatus for supplying insufflation gas to inflate a body cavity of a patient during an endoscopic procedure, comprising:
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supply means for supplying insufflation gas into said body cavity; control means for controlling the pressure in the body cavity, said control means including pressure measuring means in communication with the body cavity for providing pressure reading values taken at discrete intervals of time when no gas is being introduced into the body cavity; memory means for storing said pressure reading values; means for comparing a number n of the most recent pressure reading values to determine the differential between a highest and a lowest pressure reading value therein; and
,means for determining a nominal body cavity pressure when said differential becomes less than a predetermined pressure differential. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification