Importance

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Abstract

A gas flow valve enables constant venting and is used with a cuff showing a rapid decrease in venting ability at a predetermined value on a boundary within the pressure range which allows measurment of blood pressure. The gas flow valve has a body made of an elastic material and comprising a wedge-shaped portion formed integrally with a mounting base so as to have a flat portion with upper and lower surfaces serving as pressure-responsive surfaces, a linear opening formed at the tip of the wedge-shaped portion, and a passageway communicating with the opening and extending in the longitudinal direction within the mounting base and the tip portion. A thin sheet-like member is twisted and disposed in the passageway so that the tip portion is held by the opening. As a result, the elastic deformation of the gas passageway formed by the gaps in the opening during pressure reduction is promoted by the resiliency of the torsion of the thin sheet-like member. A sphygmomanometer air-feeding/discharging apparatus with the gas flow valve has flexibility for cuffs having various shapes and specifications and enables easy adjustment of the orifice area.

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First Claim