US 5,328,458 AGranted

Insufflation apparatus

AssigneeOlympus Optical Co., Ltd.

InventorsNaomi Sekino, Kenji Noda, Yutaka Yanagawa, Takeo Usui, Kouji Tanikawa, Kazuhiro Takahashi, Shiro Bito

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Abstract

An insufflation apparatus intended to insufflate gas supplied from a gas supply source into a cavity of the human body through a gas insufflating pipe, comprising a switch valve for opening and closing a gas supply pipe extending from the gas supply source to the gas insufflating pipe, a cavity pressure measuring unit arranged in the gas supply pipe to measure the pressure in the body cavity, a pressure setting section for setting an intended pressure in the body cavity, an arithmetic unit for calculating the difference of a value measured by the cavity pressure measuring unit relative to the value of pressure set by the pressure setting section, and a changeover control unit for changing over the timings at which the switch valve is opened and closed on the basis of values thus calculated by the arithmetic unit.

Claims18

Dependent claims

An insufflation apparatus comprising:

a gas supply source filled with gas;
a gas insufflating pipe through which gas in the gas supply source is insufflated into a cavity of a human body;
a gas supply pipe through which gas supplied from the gas supply source is fed into the gas insufflating pipe;
a switch valve for opening and closing the gas supply pipe;
cavity pressure measuring means arranged in the gas supply pipe for measuring pressure in the body cavity;
pressure setting means for setting an intended pressure in the body cavity;
arithmetic means for calculating a difference of a value measured by the cavity pressure measuring means relative to a value of pressure set by the pressure setting means;
and
control means for changing the duty cycle, during different periods in which the switch valve is opened and closed, on the basis of values calculated by the arithmetic means.

6 more elements

Dependencies are inferred from the claim text.