Patent ID: 8075492

Claim:
An automatic decompression valve for a sphygmomanometer using an extension spring, the valve comprising: a valve body, comprising a first inlet configured to receive air from a cuff, and a first outlet through which the air is exhausted; a piston comprising a piston shaft configured to move within the outlet in the valve body; a spring comprising a first end coupled to the piston; a three-way valve comprising a connector to which the valve body is coupled, a second inlet, and a second outlet, the three-way valve being connected to a second end of the spring; and a support configured to support the three-way valve; wherein the second end of the spring is coupled to the three-way valve by a thin plate, the thin plate being folded and inserted into the connector of the three-way valve in parallel with a direction of air flow through the connector so as to connect the spring to the three-way valve.