PHYSIOLOGICAL PRESSURE SENSING AND TELEMETRY MEANS EMPLOYING A DIODE CONNECTED TRANSISTOR TRANSDUCER

Pressure measurement apparatus and method, the apparatus having a pressure sensitive element, an audio oscillator, a transmitter, a receiver, a frequency-to-voltage converter and a read-out device. The pressure sensor is connected to and capable of varying the frequency of the audio oscillator as a function of the pressure applied to the sensor. The audio oscillator is connected to and capable of modulating the signal of the transmitter. The pressure sensor, audio oscillator and transmitter are implanted internal to the scalp of a living test subject, the pressure sensor being placed between the skull and the dura mater. Additionally, a remote receiver is connected to a frequency-to-voltage converter and is capable of receiving the radio frequency signal transmitter by the transmitter and supplying the detected audio oscillation of the radio frequency signal to the frequency-to-voltage converter. The frequency-to-voltage converter is capable of supplying a variable voltage to the read-out device, depending upon the frequency of the input signal delivered by the receiver. The read-out device is capable of optically displaying and/or recording the amount of signal voltage being fed to it by the frequency-to-voltage converter.