A detector implemented as a sensitive element or a primary energy transducer is the main unit of electric systems for measuring nonelectric parameters. The accuracy of measurements depends significantly on the detector precision [4].Detectors for measuring pulse wave (pressure wave) used in medicine and physiology should have a linear calibration curve, high intrinsic frequency, low frequency and temperature errors within the range from 0 to 40~ They should be compatible with devices for measuring both AC and DC components of signal [2].Special devices for recording pulsigrams were developed in our laboratory on the basis of pulse diagnosis methods used in Tibetan medicine [2, 3]. The difficulties associated with pulsigram recording and the design of one of the devices developed are described in this work.The main difficulty in the development of devices for pulse wave detection is the design of pulse detector holders. The pulse wave shape significantly depends on the mode of detector application to the site of measurement. The problem here is more difficult than the problem of attachment of the primary energy transducers (detectors) discussed in [2]. The difficulty with the transducers is caused by the similarity between the pulse curves and the curves of intravascular and intracardiac pressure. The first problem is considered below.In the device described in [5], the detector is immobile relatively to the Earth surface and not attached to patient's body. Vibration sensors are pressed against the patient's body with special brackets and screws. However, if the detector is not attached to the patient's body, involuntary motions of the body, muscle tremor, etc. cause artifacts that make accurate recording of biological signals very difficult. These artifacts are significantly decreased if the detectors are attached to the patient's body. This mode of the detector application is commonly used. It should be noted that mechanical regulation of detector pressing against a biological object has certain shortcomings discussed below.The pulse wave detector described in [7] is especially appropriate for pulse diagnosis by the methods of Eastern medicine. This detector incorporates three capacitive transducers of pulse signal to electric signal. The transducers used in this device and in the device described in [5] are capable of transducing static pressure signals to electric signals. The output signal of these detectors provides information about the degree of their pressing against the patient's body. However, the common disadvantage of the two devices is mechanical regulation of pressing.Unlike pneumatic regulation, mechanical regulation does not provide a sufficient sampling step. Therefore, mechanical regulation is unable to provide sufficiently fine tuning of the detector pressing against the patient's body. Such a tuning can be provided if a low-rigidity element is inserted between the detector and the human body. This method was implemented in the VP vein pulse detectors, which were produced in the former Democr...
According to the methods of Eastern medicine, pulse signals of radial arteries of right and left arms are detected in three traditional zones of palpation [3, 4]. By pressing against these zones with various force, the physician induces changes in the hemodynamic situation depending on vascular resistance. The more distant is an organ from the heart, the greater is the vascular resistance. Therefore, pressing against proximal points is more intensive than against distal ones. Besides, greater value of detector pressing against the artery in proximal points is explained by the fact that the artery goes deeper in the muscular bed in the proximal--distal direction. In addition to hemodynamic characteristics of the vascular wall, rheological properties of blood (volume blood flow, blood flow distribution across the vessel, turbulence) are determined.The device developed in our laboratory is intended to provide automation of Tibetan medicine pulse diagnosis. The device contains transducers set on the mobile ends Of rubber bellows (
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