Blood pressure monitor system with pushbutton zero-offset compensation

Claim 1

A blood pressure monitor system for monitoring blood pressure of a patient said system comprising: transducer means adapted to be operatively connected to said patient for sensing said pressure and for converting said pressure into an analogous electrical signal; amplifying means; means for extending said electrical signal to input terminals of said amplifying means; indicator means responsive to output of said amplifying means for displaying value of said pressure; means for disconnecting said transducer means from said patient thereby applying zero pressure to said transducer; a manual control; feedback means including said manual control; means responsive to operation of said manual control for simultaneously increasing gain of said amplifying means, generating a transducer-compensating zero-pressure-offset signal during operation of said disconnecting means, and extending said offset signal to said input terminals of said amplifying means to cause said indicator means to display zero pressure; and means for maintaIning said offset signal for an extended period of time after release of said manual control and after termination of operation of said disconnecting means.