Medical gas insufflator with automatic gas flow control
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United States of America Patent
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Sep 1, 1998
Grant Date -
N/A
app pub date -
Oct 19, 1995
filing date -
Feb 25, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A medical insufflator has a flexible tube having a downstream end provided with a needle and an upstream end, the tube and needle forming an insufflation flow path for a neutral gas into a surgical cavity into which the needle is inserted, a supply of the neutral gas under pressure connected to the upstream end, and a flow-control valve along the flow path at the upstream end. It is operated by measuring an insufflation pressure at the upstream end of the insufflation path, continuously calculating intracavity pressure from the insufflation pressure by evaluating loss of pressure of the flow path, comparing the calculated intracavity pressure and a preset value of this intracavity pressure, and controlling the flow-control valve as a function of the result of the comparison with the above-mentioned preset value in order to continuously supply a flow of the neutral gas that is minimally sufficient to compensate for leakage of gas from the surgical cavity and to maintain the intracavity pressure generally equal to the preset value.
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