脈診儀已有多家公司開發，其原理多以壓電感測之方法，因此所得到的數據為寸、關、尺脈之壓力脈象。但醫師的手感把脈，所感測得到的訊息不止是血管的垂直壓力變化而已。例如血液在血管中黏稠值、血管內血液的順暢與否，則可用手指來感測。一般用垂直式壓力計量測垂直方向壓力變化，則不能完全描述其內容。 本文是製作出一種脈音聽診儀利用電容式麥克風可偵測脈之聲波並顯示其波形於電腦上，並可經由不同的取脈壓力，擷取不同的脈音信號，藉以取代傳統壓電感測式脈診儀。 我們同時也設計了一支脈像模擬系統之假手，其血管用以軟管代替，以流體驅動幫浦（Pump）控制其流量及波形，可模擬不同之脈象。我們給予以不同之驅動信號，藉以驗證其脈波之變化；我們得到不同之音波波形。此假手已可用來做教學之用，以教導學生感覺不同之脈象。Pulse diagnostic device has been developed by many companies, most of them use the idea of piezoelectric sensor. Thus, the datum are all about the average pressure of pulses at Cun, Guan, Chi local area. But, a doctor feels pulse by hand, the informations he learned are more than the variation of vertical local area average pressure in blood vessel: for example,the blood ropiness in blood vessel and the smoothness of blood flow can be sensed by the feeling of the fingers but it can not be fully described by the variation of vertical pressure. In this article we have build up a pulse sound diagnostic device: in this device we use the capacity microphone to detect the sound wave of the blood pulse and analysis its wave patterns in the computer. Then, we get its spectrum after we do the wavelet and Fourier transform. Thus we can get more information than pressure sensor type devices, such as the blood's smoothness and its quantify datum. We have also designed a simulation system with a fake hand of which the blood vessels had been simulated by robber tube. Use liquid-driven pump to control its flow and waveform can simulate different phases of blood pulses, we use different ropiness liquid to verify that the ropiness will change pulse wave patterns. This fake hand can be also used for education to teach students to feel the different pulse forms.
