Patent ID: 11872334
Assignee: NIKKISO COMPANY LIMITED
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 6:
7. A pressure detector comprising: a case connectable to a flow route for liquid, the case comprising: a liquid-phase-portion case and a gas-phase-portion case in communication with the liquid-phase-portion case; a membrane member located between the liquid-phase-portion case and the gas-phase-portion case so that a liquid-phase portion to be supplied with liquid is formed on a side of the membrane member proximate to the liquid-phase-portion case and a gas-phase-portion to be supplied with gas is formed on a side of the membrane proximate to the gas-phase-portion case, wherein the membrane member is displaceable by a pressure of the liquid provided on the side by the liquid-phase-portion; a pressure detection sensor located in communications with the gas-phase-portion to detect the pressure of the liquid in the flow route, the pressure detector comprising: an opening in the gas-phase-portion case that allows gas to be introduced into or discharged from the gas-phase-portion in accordance with the displacement of the membrane member; a recess provided in an interior of the gas-phase-portion case around the opening; and a hydrophobic membrane located within the recess and extending over the opening to allows gas to pass into the flow route and block the liquid from passing into the flow route so that the pressure detection sensor is free of contact with the liquid.