Method and device for determining the efficiency of muscle venous pump

 

(57) Abstract:

The invention relates to medicine. Measure the volume of the limb after performing dosed physical load and when the transition from the horizontal to the vertical position. The efficiency of muscle venous pump is defined as the result of dividing these values in %. The method allows to take into account individual variation of the initial values of the volume of a limb. The device contains plethysmographic connected through an adjustable current source, and a control circuit to the controller, which also ADC is connected through a signal amplifier of the sensor. Last through the pre-amplifier connected to the sensor directly with the source of the reference voltage. To the output of the controller is also connected keyboard control, and to its input via the bus of the microprocessor device constant memory and the indicator. 2 S. and 1 C.p. f-crystals, 1 Il.

The invention relates to medicine, in particular to phlebology, and can be used to determine the functional state of the veins of the lower extremities, in particular the efficiency of muscle venous pump of the leg in the execution of the dosed physical load evaluation sostojatel the capacity of muscle venous pump (P. Alekseev P. Methods of diagnostics of vascular diseases of the extremities. HP: Medicine, 1971, 190 C.), at which the efficiency of muscle venous pump is estimated to reduce the level of the liquid column in the vessel, which is connected with the measuring cuff, using March tests, Delbe-Perthes disease, however, this method has low accuracy.

There is also known a method of determining the state of the muscle venous pump of the lower extremities (A. S. N 880406, 1981), which aimed at reducing the morbidity status of the muscle venous pump is determined by the magnitude of the change in muscle volume of the upper third of the leg when walking.

As devices used to study the functions of the muscle venous pump of the Shin, known advanced peoplesmart (Ignatiev, I. M. Surgical correction of violations of the outflow of blood through the deep veins in post-illness. Diss. Kida. the honey. of Sciences, Leningrad, 1988, S. 48-52), pneumatic plethysmographic connected by a rubber tube with pressure gauge (Zavialov C. D. Modern approach to diagnosis and definition of tactics of varicose veins of lower extremities based on a quantitative assessment of hemodynamics. Diss. for obtaining the academic step is I indicators of venous hemodynamics, measure the indirect value (impedance of the tissue or the air pressure in the cuff) and require significant post-processing of the received data. The most optimally used in similar studies of A. plethysmometer (M. I. Lytkin, A. N. The Vedeno and other Occlusive plethysmography in the diagnosis of abnormalities of the venous blood flow in the lower extremities. Bulletin of the surgery. I. I. Grekova 1988, No. 6, S. 38-43).

As a prototype known method (Zavialov C. D. Modern approach.. ., C. 164-180), in which the patient performs the sustainer of the sample for one minute, with the help of pneumatic plethysmography installed on the upper third of the tibia, plethysmographically recording cuff of plethysmograph "Fluvoscript" is determined by the volume reduction of limbs in the mm, which is then translated into a relative reduction of the volume of a limb, which is the parameter that characterizes the work of the muscle venous pump.

However, this method has a high complexity and does not provide sufficient accuracy to determine the effectiveness of muscle venous pump, because the first pneumatic plethysmographic has a low rate is about second this method does not account for individual variation in the initial values of venous volume.

The invention is directed to improving the accuracy and reliability of determination of efficiency of muscle venous pump of the leg.

For this it is necessary to determine the increase in limb volume (in ml per 100 ml of tissue) at the transition from the horizontal to an upright position (orthostatic volume), and then to determine the decline in the execution result of the dose load of five times rising on his toes (meaning muscle pump), then divide the value of muscle pump on the value of orthostatic volume. This is the result, expressed as a percentage, and is a characteristic of the efficiency of muscle venous pump of the tibia, which takes into account the individual variation of the initial values of the volume of a limb.

Device for the automated implementation of this method, shown in the drawing, consists of A. plethysmometer (sensor Witney) 1, is connected through an adjustable current source 2 and the control circuit 3 to the first digital output controller 9, the second digital output through an analog-to-tiiny amplifier 4 is connected to the sensor, and the second with the output of the voltage reference. The third digital output controller 9 is connected to the control keyboard 8, and a digital input connected to the bus of the microprocessor 10, to which is also connected device's permanent memory 11, a RAM 12 and through the indicator 13. The device has an output analog signal for recording on the recorder.

The device operates as follows. On the upper third of the tibia of a patient lying in a horizontal position, set A. plethysmometer, and keyboard control the command is given to start work. In accordance with the program stored in the ROM, the CPU via the controller and the control circuit sets the value of the current sensor, in which the voltage at the amplifier output signal is zero. Then at the command of the experimenter, the patient goes into a vertical position. The resulting increase in limb (orthostatic volume) is recorded by the processor in the device memory and is displayed on the indicator as speeds increase and its final value. Then, at the command of the experimenter, the patient performs the exercise nagruzke thus reduce limb muscle venous pump) is recorded by the processor in the device memory, then, the processor calculates the value of the efficiency of muscle venous pump, as expressed as a percentage of the result of dividing the value of muscle venous pump on the value of orthostatic volume. On command from the keyboard to the indicator alternately called all measured parameters: orthostatic volume, the value of the muscle venous pump, the efficiency of muscle venous pump, the speed of growth after the transition to a vertical position in the research process analog curve is recorded on a chart recorder.

1. The way to determine the effectiveness of muscle venous pump of the tibia, including the registration of the volume of a limb with plethysmometer, determination of reducing the volume of a limb after dosed physical load, characterized in that determine the growth of the limb after the transition from horizontal to vertical position, and the value of the efficiency of muscle venous pump tibia is defined as the percentage of the result of dividing the output of the reduce limb after performing dosed physical loading on the growth of the limb when moving in a vertical position.

2. done on socks.

3. A device for determining the efficiency of muscle venous pump containing plethysmometer, characterized in that it is connected through an adjustable current source and control circuit to the first digital output of the controller, to the second digital output through an analog-to-digital Converter connected to the amplifier output signal, the first input is through a pre-amplifier connected to the sensor, and the second with the output of the voltage reference, the third digital output of the controller is connected to the control keyboard, and a digital input connected to the bus of the microprocessor, to which is also connected device constant memory and the indicator.

 

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