Liquid coupled blood pressure sensor

A wearable sensor system, comprising:

• a liquid;
• a rigid housing defining a cavity within which the liquid is rigidly constrained by the rigid housing, the rigid housing including an aperture through the rigid housing into the cavity and a rigid interface surface surrounding the aperture;
• an elastic membrane extending across the aperture for elastically constraining the liquid at the aperture and wherein a portion of the elastic membrane that extends across the aperture is configured to conform to a body part when the elastic membrane is pressed against the body part;
• an overmold layer disposed over the rigid interface surface surrounding the aperture and intervening between the elastic membrane and the rigid housing, wherein the overmold layer is formed of an elastic material having a greater thickness than that of the elastic membrane;
• an inextensible cuff attached to the rigid housing and adapted to hold the rigid housing against the body part over an artery within the body part;
• and
• a pressure sensor mechanically coupled to the liquid to measure pressure signals emanating from the artery and propagated through the elastic membrane and the liquid to the pressure sensor.