| 摘要 |
A four function vital sign monitor. The apparatus provides a display showing a person's temperature, respiration rate, pulse rate and blood pressure. The apparatus is specifically designed to provide accurate systolic and diastolic measurements for persons having healthy, flexible arteries or unhealthy, rigid arteries, or having unusually low blood pressure as a result of trauma or other shock-inducing event. A blood pressure cuff applied around any extremity transmits cuff pressure signals, for blood pressure and pulse rate computation, to a pressure transducer housed in the monitor. The versatility of the apparatus resides in its provision of a plurality of devices having different levels of sensitivity so that pressure pulses of differing amplitudes transmitted by the pressure transducer are detected by different ones of such detecting devices. Each device, when activated by a pressure pulse having the requisite threshold amplitude, emits a signal to a microprocessor that computes the diastolic and systolic pressure and the pulse rate. When any one or more of the pressure pulses of an individual are not present, the microprocessor performs computations on the available data as modified by the addition of predicted values for the unavailable data. When pressure signals even smaller than a preselected allowable threshold are present, a threshold-establishing device is automatically bypassed to admit such small signals to the microprocessor through the amplifiers.
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