Journal Biomedical Radioelectronics №7 for 2012 г.
Article in number:
Non-contact monitoring of the complex chronomagnetotherapy patient's breathing and heartbeat on the basis of ultrasonic beats
Keywords: ultrasound location beat frequencies pulse monitoring breath monitoring remote measurement
E.M. Proshin, E.O. Putilin
Currently, the complex chronomagnetotherapy is allocated an important area related to the harmonization of the parameters magnetotherapeutic exposure to the rhythms of the patient's heart rate and breathing to improve the effectiveness of treatment. The use of contact sensors for the removal of breathing and pulse parameters burdened physician with additional work, creates discomfort for the patient and increases the time of preparation for a session of magnetic therapy. So are the actual development and use of remote sensing methods for detecting proximity of cardiac and respiratory rhythms, which have several advantages compared with the contact. In this well-known non-contact methods of recording processes in heart and breathing have low sensitivity and noise immunity of measurements, and are quite expensive. For this reason, the article provides a method of non-contact recording heart rate and respiration, based on the beats of ultrasonic frequencies. In this method, the chest lying motionless patient is irradiated by the sum of two distinct signal of ultrasonic frequencies. Reflected from the chest, the beat signal enters the receiver. After that the measured value of the current phase shift between the transmitted and received envelopes of the signals, which depends on fluctuations in the patient's chest. Thus, the obtained values of the current dependence of the phase shift on the time corresponding to the rhythms of respiratory and cardiac patients. By filtering the received signal is separated into components of the respiratory and heart rate. The article suggests two devices, which are based representation method for lenny: on the basis of continuous ultrasound beats; based on the ultrasonic pulse beats. The first device is based on measuring the phase shift between the envelope signals transmitted and received beatings. In this case the received signal changes the phase shift in time corresponds to fluctuations in the patient's chest. The disadvantage of this device is that the patient's chest movements imposed severe restrictions the amplitude of the displacement must not be more than a quarter wavelength of the ultrasound beats. With this in mind, the second device, along with the measurement of the phase shift between the envelopes, use echolocation principle of measuring the distance from the patient's chest. Thus, the fluctuations are taken into account as a small chest and large amplitudes, which significantly extends the capabilities of the registration process the patient's heartbeat and breathing. Thus, the presented method is noncontact and remote process monitoring heart rate and breathing the patient has several advantages in comparison with known analogues. Among the main advantages of method can distinguish a high sensitivity and noise immunity, as well as a fairly simple technical realization. The received signals rhythms heartbeat and breathing can be used in an integrated organization for the biotechnology chronomagnetotherapy feedback, and in other areas of medicine to control the overall functional state of the patient.
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