The paper evaluated the diagnostic value of laser photoplethysmography when examining patients with chronic lower limb ischemia. A statistical analysis of the research results was made, and diagrams of relationship between the degrees of ischemia and blood flow are presented. Development of the device to determine the level of peripheral blood circulation and saturation was presented. Also additional accessories in the form of optical fibers for different applications were suggested.

Introduction. The human health directly depends on the state of peripheral blood circulation. Blood filling disturbance causes various types of disorders of our body. For example it causes the bad healing of postoperative wounds. Therefore, for timely and qualitative diagnosis of such disorders the modern medicine uses non-invasive methods; these methods allows painless and non-destructive control of affected areas. The most perspective among them are optical methods for recording and transforming of biomedical information [1, 2, 5]. Obesity is one of the actual problems of modern world medicine, and it's one of the reasons of the bad healing of postoperative wounds. It is caused by the difference in the blood filling of tissues in patients with different body mass. Method and results. An analysis of the blood filling of the anterior abdominal wall was provided on the basis of the VNMU Department of General Surgery and of the Surgical Department of the Сlinical hospital №1 in the city of Vinnytsia. Determination of the blood filling was carried out by means of opto-electronic plethysmograph, which was developed by us. Were examined patients with inguinal groin hernias (20 men and 20 women) with different body mass, aged 27-75 years. All patients were divided by body mass index (BMI) and by the degree of obesity into 4 groups. The 1 st (control) group included 15 patients with normal body weight (BMI 18.5-24.9). The 2 nd group included 9 patients with overweight and the I degree of obese (BMI 25.0-29.9 and 30.0-34.9 respectively). The 3 rd group included 10 patients with II degree of obese (BMI was 35.0-39.9). The 4 th group included 6 patients with obesity of the III and IV degrees (BMI≥40.0). At that time, starting from the 2 nd day after surgery treatment was performed stimulation of microcirculation in the area of the postoperative wound for patients with obesity of the III and IV degrees. And was measured the blood filling in the tissues of the postoperative wound area before and after surgery. There were 32 patients (18 men and 14 women) aged 28 to 60 years old

The physical-mathematical model of distribution of optical radiation in biological tissues was developed. It allows determining the change of intensity of optical radiation depending on such parameters as installation angle of the sensor, biological tissue thickness and the wavelength. Were Obtained graphics which represent changes of the optical radiation intensity that is registered by photodetector depending on installation angle of the sensor, biological tissue thickness and the extinction coefficient

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