Self levelling biological pressure transducer means with input excitation voltage matching amplifier

A transducer system for measuring biological pressure of a patient, the system comprising:

• biological pressure transmission means for transmitting a biological pressure of the patient at a biological location via a fluid to a transducer location;
• pressure monitor for measuring said biological pressure, said pressure monitor generating a biological excitation signal, said pressure monitor including biological transducer means at a transducer location for receiving said fluid from said biological transmission means and generating a biological pressure signal with said biological excitation signal representing a pressure of said fluid from said biological transmission means at said transducer location;
• an atmospheric pressure transmission means for transmitting an atmospheric pressure at a reference location;
• reference pressure means for measuring atmospheric pressure and a vertical fluid pressure of said fluid in said atmospheric transmission means, said reference pressure means including amplifier means for generating a reference excitation signal from said biological excitation signal, said reference pressure means including a reference pressure transducer means for receiving said fluid from said atmospheric pressure transmission means and generating a reference pressure signal with said reference excitation signal representing a pressure of said fluid from said atmospheric pressure transmission means, a vertical distance between said reference location and said reference pressure transducer means being substantially similar to a vertical distance between said transducer and biological location;
• signal connection means for combining said biological pressure signal and said reference pressure signal into a combined signal, said signal connection means feeding said combined signal into said pressure monitor, said signal connection means combing said biological and reference pressure signals to cause an atmospheric component and a vertical fluid pressure component of said biological and reference pressure signals to substantially cancel each other in said combined signal.