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

Claim 0:
1. A pressure detector comprises:
a case connectable to a flow route for liquid,
a membrane member attached inside the case and with which a liquid-phase portion to be supplied with the liquid in the flow route and a gas-phase portion to be supplied with gas are separated from each other, the membrane member being displaceable in accordance with a pressure of the liquid supplied to the liquid-phase portion,
the pressure detector detecting the pressure of the liquid in the flow route by detecting a pressure in the gas-phase portion with a pressure detection sensor, the pressure detector comprising:
a hydrophobic portion that allows gas to pass through but blocks liquid from passing through, the hydrophobic portion being provided between the gas-phase portion and the pressure detection sensor, wherein the hydrophobic portion is a hydrophobic membrane,

an opening, in the gas-phase portion, through which gas is allowed to be introduced into or discharged from the gas-phase portion in accordance with the displacement of the membrane member; and
a recess is provided around the opening of the gas-phase portion, and the hydrophobic portion is provided over the recess inclusive of the opening,
wherein the membrane member and the hydrophobic membrane are located inside of the case.