JPS6485663A - Medial machine driving apparatus - Google Patents

Abstract

PURPOSE:To reduce not only the difference of the rate with the living body heat even in the change-over to an internal rate but also the variation of a blood flow rate, by always storing the signal calculated from a living body signal and discriminat ing the disturbance of the present living body signal by a discrimination means when the disturbance is generated in said living body signal to change over said signal to a stored normal signal. CONSTITUTION:A microcomputer unit CPU sets an output port to an initial level to clear the content of a read/write memory (RAM) and reads the value preliminarily stored in a read exclusive memory (ROM) to set an initial value to a parameter. At the time of a non-synchronous mode, a heart rate PR value is calculated on the basis of an internal cycle parameter (reciprocal of a heart rate). In the case of a synchronous mode, a synchronous signal waveform such as an electrocardiographic waveform or a blood pressure waveform is confirmed and a heart rate cycle and the average alpha of said cycle are calculated to be stored in a memory. Further, the average value of the cycle before a predetermined a-heart rate is loaded from the memory to be substituted for beta. Then, it is judged whether the average alpha of the present cycle is between predetermined lower and upper limit values (b), (c) and, when said average is out of the range, beta is substituted for gamma to calculate the PR value in the same way as the non-synchronous mode.