Devices for measuring blood pressure

Claim 1

A REMOTE PRESSURE TRANSDUCER APPARATUS COMPRISING A LIGHT-REFLECTING DIAPHRAGM, MEANS SUPPORTING THE DIAPHRAGM FOR EXPOSING ONLY ONE SIDE THEREOF TO A FLUID PRESSURE, SAID SUPPORTING MEANS PERMITTING DISPLACEMENT OF THE DIAPHRAGM ON THE SUPPORTING MEANS IN RESPONSE TO SAID PRESSURE, SAID DIAPHRAGM HAVING A SELECTED ELASTICITY SUCH THAT SAID DIAPHRAGM CAN BE DISPLACED BY SAID PRESSURE TO AN EXTENT WHICH IS PROPORTIONAL TO SAID PRESSURE, A LIGHT SOURCE LOCATED REMOTELY FROM SAID DIAPHRAGM, LIGHT-CONDUCTING OPTICAL FIBER MEANS CONDUCTING LIGHT FROM SAID SOURCE AND DIRECTING SAID LIGHT ONTO THE OPPOSITE SIDE OF THE DIAPHRAGM FOR REFLECTING A PROPORTIONAL PART OF SAID LIGHT THEREFROM TOWARD A FIRST STATION IN ACCORDANCE WITH SAID DISPLACEMENT OF THE DIAPHRAGM, LIGHT-CONDUCTING OPTICAL FIBER MEANS CONDUCTING SAID REFLECTED LIGHT FRAME SAID FIRST STATION TO A SECOND STATION LOCATED REMOTELY FROM SAID DIAPHRAGM, AND PHOTOELECTRIC MEANS RESPONSIVE TO SAID REFLECTED LIGHT CONDUCTED TO SAID SECOND STATION FOR PROVIDING AN ELECTRICAL SIGNAL CORRESPONDING TO SAID FLUID PRESSURE.