Pulse activity indicator

Claim 1

A cardiovascular instrumentation system for measuring cardiovascular activity having a plurality of positive peaks comprising: sensor means for generating an electrical analog signal of cardiovascular activity of a living subject; a linear amplifier connected to said sensor means for increasing the power of said electrical analog signal; first logic circuit means connected to said linear amplifier for producing a digital pulse signal having a pulse duration corresponding to the time of cardiovascular activity; second logic circuit means connected to said first logic circuit means for producing a digital signal having a pulse duration corresponding to the length of time from the initiation of the cardiovascular activity to the first peak thereof; a first measuring circuit means connected to said second logic circuit and to said linear amplifier for measuring the value of said amplified cardiovascular analog signal in response to the output of said second logic circuit means and connected to said first logic circuit means for enabling said first measuring circuit means to measure succeeding pulses; a first display means connected to said first measuring for providing an indication of the measured value; third logic circuit means connected to said first logic circuit means for generating a digital signal having a pulse duration corresponding to the length of time from the initiation of the cardiovascular activity to a second peak thereof; a second measuring circuit means connected to said third logic circuit and to said linear amplifier for measuring the value of said amplified cardiovascular analog signal in response to the output of said third logic circuit means and connected to said first logic circuit means for enabling said second measuring circuit means to measure succeeding pulses; a second display means connected to said second measuring circuit means for providing an indication of the measured value; a stabilized voltage source; a trigger generator circuit connected to said first logic circuit means for generating a pulse in response thereto; a first switch means connected to said trigger generator circuit and to said stabilized voltage source for timely switching said voltage in response to the trigger pulse; a capacitor connected to said first switch to be charged to the stabilized voltage upon operation of said first switch means; a plurality of resistances connected to said capacitor to serve as a discharge path therefor; a plurality of switch means, each connected to one of said plurality of resistances and effectively connected to said capcitor to complete the discharge path; and fourth logic circuit means connected between said trigger circuit means and said plurality of switches for sequential energization of each switch.