How to adjust the output signal provided by the configured interface to connect between a noninvasive blood pressure detecting device and the invasive blood pressure monitoring devices to zero

摘要

A single microprocessor-based interface is connected between an oninvasive blood pressure (NIBP) sensor (302) and an invasive blood pressure (IBP) monitor (318). The interface effectively emulates an IBP transducer so that the IBP monitor sees the interface as if it were a regular IBP transducer from a fluid-filled blood pressure monitoring line. It receives the signal from an NIBP sensor and determines the blood pressure corresponding to the signal. It accepts the excitation voltage provided by the IBP monitor. From the excitation voltage and a known transducer sensitivity which the IBP monitor is configured to work with, the interface emulates the IBP transducer output signal corresponding to the blood pressure. The interface also emulates the input and output impedances of the IBP transducer. Zeroing of the interface with the IBP monitor can be performed in a way that is similar to that for a fluid-filled system