Non-invasive blood pressure monitor

Claim 1

A monitor of subcutaneous blood pressure comprising: a. a body having a contact face for bearing against the skin of a subject, a back face and an opening in said body extending from said contact face to said back face; b. a diaphragm operatively mounted in said opening for deflection of the same in a direction perpendicular thereto having a contact face in continuous and substantially flush relation with the contact face of said body and having means for securing the edge of said diaphragm thereto with substantially a rigidly-mounted edge-fixity; c. a means for operationally holding the contact faces of the body and the diaphragm therein at a determinable contact bearing pressure against the skin of the subject; d. an electrical strain-sensor operatively-connected to an input source of electrical power mounted on the back face of said diaphragm having an electrical output in direct relation to the strain input from the deflection of the diaphragm under subcutaneous blood pressure; e. electrical bridge and amplifier circuit operatively-connected to the electrical output from the strain-sensor; and f. pressure indicating and recording means operatively-connected to the electrical output from the bridge and amplifier circuit.