Structure Design And Analysis Of The Pulse Image Information Detection Device

In recent years, in order to reveal the nature and the formation mechanism of thepulse information, the domestic and foreign scholars have done a lot of work on thepulse-taking device and the detection method of the pulse condition. Various types ofpulse condition devices have been developed. Although the most widely used pressuresensor can acquire and analyze the signal conveniently, the acquisition of informationin radial pulse condition points is less, which has limited to obtain comprehensivepulse condition information.Although the visualization information detection device of the pulse condition isdeveloped on the base of the image sensor, which have made up the disadvantage ofthe pressure sensor detection device such as less detection parts, there are lot ofshortages on the probe and the film of the device. It makes the extraction of the bestpulse waveform more difficult. Because the pulse-taking pressure can not bemeasured accurately, it affects the acquisition of the pulse condition information.Doctors feel the pulse changes and the mutual relationship under differentpulse-taking pressures carefully through carrying out different pressures to the radialsuch as "float, medium and heavy" by the fingers, this is so-called Traditional ChineseMedicine pulse-taking. Therefore, realizing the accurate measurement of the pulsetaking pressure has great significance to acquirement and analysis of the pulsecondition information.This study has improved the visualization pulse detection device and hasovercome the shortcoming of industrial camera to realize the macro image collectionby combining the CMOS cameras and the magnifying glass, which has avoided theinfluence of the experimental light on the pulse waveform extraction because of theexcessive distance between the cameras and the probe. In this paper, the cantileverbeam type structure can measure the pulse-taking pressure directly and accurately.The film of the probe was designed and produced with the silica gel and the modelthat have overcome the shortage of the film: easy aging, bad imitation nature andunsatisfied thickness and so on. The improved device was used to acquire the data ofthe MM-3pulse condition model with the different film thickness, differentpulse-taking pressures and different inner pressures respectively. Then thecomparative analysis was carried on the data. The experiment results have shown thatthe extracted pulse waveforms have the least distortion, the best smoothness and thebiggest pulse amplitude change when the thickness of the film is0.504mm, thepulse-taking pressure is3N and the pressure of the seal chamber is120KPa. The collected data was analyzed in the time domain and the time space domain. Then somefeature parameters have been extracted from the pulse condition: the pulse frequency,the pulse period, the pulse length and the pulse width, and the three-dimensionalinformation of the pulse condition are reconstructed. The results have revealed thatthe extracted information is agreement with the clinical expression.Generally speaking, the improved pulse imagination detection device can adjustand measure the pulse-taking pressure, and it can simulate the Traditional ChineseMedicine pulse-taking at parts of float, medium and heavy under differentpulse-taking pressure. The reasonable pulse-taking pressure and probe parametershave laid the foundation to obtain better pulse condition information. The improvedprobe film can simulate the TCM pulse-taking more realistic, has more detection partsand can obtain3D pulse condition much better. This work has laid a foundation forthe study of the pulse imagination condition detection.