The heat meter flow velocity

 

The invention relates to a medical measuring equipment, namely, devices control the speed of blood flow. The heat meter flow velocity comprises a cylindrical probe, which is made of plastic and which are instantaneous and inertial workers junctions containing the contact surface, and outside the junction of the differential thermocouple and the measuring device and the signal processing differential thermocouple. The latter contains an electronic amplifier, a differentiator, a storage device, the device is multiplication by a constant factor, a comparator, and an electronic timer with corresponding connections. The contact surface of the work junctions of the differential thermocouple is flat and located in the plane of one of the ends of the probe with the possibility of contact with the test area of the test object. The meter is simple in construction and reliable in operation. 3 Il.

The invention relates to a medical measuring equipment, namely, devices control the speed of blood flow.

Known heat meter flow velocity (Copyright certificate 810214. Sensor to measure the other, one of which is connected to the current source, and the other to the recording unit. thermocouple is connected to the current source, cools the blood stream due to the energy of the latter, and with another thermocouple measures the temperature of the blood stream. The velocity of blood flow is measured by changing the temperature of this stream.

The disadvantage of this heat flow meter is the invasiveness of the measurement and the need for significant supply of energy to the heating element, cooling the blood stream.

The closest in technical essence is the heat meter flow velocity (Copyright certificate 923519. Catheter sensor for measuring the linear velocity of blood flow. Bull. 16, 1982), containing a cylindrical probe made of plastic masses, which are instantaneous and inertial workers junctions containing the contact surface, and outside the junction of the differential thermocouple and the measuring device and the signal processing differential thermocouple.

In the process of measuring probe for measuring blood flow is introduced into the test vessel to the instantaneous junction is fed to the flow of heat from the electric heater, and the flow velocity is determined by the signal differenet, due to the fact that when the measurement probe is directly injected into the test vessel, which requires surgery.

The task of the invention is to simplify the measurement process, its acceleration and exclusion injury of the investigated vessel.

The technical result - the creation of simple construction and reliable in operation of the heat meter flow velocity, providing non-invasive measurement.

The technical result is achieved by the fact that in thermal flow meter, containing a cylindrical probe made of plastic masses, which are instantaneous and inertial workers junctions containing the contact surface, and outside the junction of the differential thermocouple and the measuring device and the signal processing differential thermocouple, the contact surface of the work junctions of the differential thermocouple is flat and located in the plane of one of the end faces of the cylindrical probe with the possibility of contact with the test area of the test object, and the measuring devices and signal processing differential thermocouple included electronic amplifier, a differentiator, a storage device, devices who enoy thermocouple is connected to the input e of the amplifier, and the output of the latter is connected to the differentiator, a storage device and to one input of the comparator, the output of the differentiator is connected to including the input e of the timer, the output of the storage device connected to the input of the multiplication by a constant factor, and the output of this device is connected to the second comparator input and a comparator output connected to a switching input e of the timer.

Such a construction of the heat meter flow velocity enables non-invasive monitoring of blood flow velocity through the use of differences in the speed of heat supply to the instantaneous inertial working junctions of the differential thermocouple contact them with a test area of the test object.

Compared with the prototype of the claimed design has distinctive features in the set of elements, their design and arrangement.

The scheme of the heat meter flow velocity is shown in Fig.1.

In Fig.2 shows the signals of thermocouples.

In Fig.3 shows the experimental dependence of the output value of the meter to the velocity of the fluid medium.

Heat meter sogani instantaneous 2 and 3 inertial workers junctions and outside 4 the junction of the differential thermocouple and the measuring device and the signal processing 5 differential thermocouple. Differential thermocouple is composed of two connected in opposite thermocouples 6 and 7 have the same static, but a different dynamic characteristics. The contact surfaces 8 and 9 respectively instantaneous inertial work junctions made flat and located in the plane 10 of one of the end faces of the cylindrical probe with the possibility of contact with the measured region 11 of the test object. The measuring device and the signal processing differential thermocouple consists of an electronic amplifier 12, the differentiator 13, a storage device 14, device, multiplication by a constant factor 15, a comparator 16 and the electronic time counter 17. The output of the differential thermocouple is connected to the input e of the amplifier 12, and the output of the latter is connected to the differentiator 13, a storage device 14 and to one input of comparator 16. The output of the differentiator 13 is connected to including the input e of the timer 17, the output of the storage device 14 is connected to the input of the multiplication by a constant factor 15, and the output of this device is connected with the second input of the comparator 16, and its output is connected to a switching input e of the timer 17.

Work th is cooled to ambient temperature. Then the bottom (Fig.1) the end of the probe in the plane which are working junctions 2 and 3, is brought into contact with the test area of the test object 11, for example with the wall of the vessel in which blood flows. The signal of thermocouple 6, operating junction 8 which has a low thermal inertia, almost immediately reaches the surface temperature of the test object. The signal change U1this thermocouple in time shown in Fig.2A.

At this time, the signal of thermocouple 7, operating junction 9 which has a high thermal inertia (ten or more times superior thermal inertia junction 8), increases exponentially (Fig.2B), and the rate of its increase depends on the intensity of heat supply from blood flow through the vessel wall to the junction. Since thermocouples 6 and 7 includes a counter, then the resulting signal, which signal U of the differential thermocouple has the form shown in Fig. 2B. In this case the initial value of the signalddifferential thermocouple is U1.

Over time due to increased signal U2thermocouple 9 signal Uddifferential thermocouple will decrease (Fig.2B). For the characterization of flow velocity take a period of time T, for catocene T decreases.

The dependence of the T on the rate of flow of liquid W has the form (Fig.3). This dependence is experimentally obtained in experiments with a model of the vessel, which served as a silicone tube with an inner diameter of 4 mm and a wall thickness of 0.5 mm Model fluid when this water was preheated to a temperature of 37oC.

The measurement of T using the device 5 measurement and processing of the information signal of the differential thermocouple is as follows.

At the time of installation of the probe in the study area of the object of control signal Uddifferential thermocouple becomes maximum. The signal U at the output of the electronic amplifier, which is proportional to the signal differential thermocouple (U = Udto - gain electronic amplifier 12), also becomes max U = UM= U1. While the differentiator produces an electrical pulse signal, which launches electronic time counter 17. At the same time the storage device 14 stores the maximum value of UM. The signal UMarrives at the input of the multiplication by a constant factor 15 and after multiplying by 0,368 enters the second whakaora all time comes a decreasing signal U (Fig.2G). At the time when the signal U is supplied to the first input of the comparator becomes equal 0,368 UMthat is , the signal received at the second input of the comparator, the latter produces an electrical signal which is fed to the switching-off of the input e of the counter, and the clock stopped. The resulting value of time equal to the interval T, which determine the velocity of blood flow.

The advantage of the proposed technical solution is: - simplicity of design and operation; - non-invasive measurements; generating a probe signal; low cost.

The proposed device can be implemented on the basis of thermocouples made of standard electrode materials, and electronic chips.

The device may find application in routine studies of blood flow in various organs.

Claims

The heat meter flow velocity, containing a cylindrical probe made of plastic masses, which are instantaneous and inertial workers junctions containing the contact surface, and outside the junction of the differential thermocouple and the measuring device and signal processing and the door is Olney flat and located in the plane of one of the end faces of the cylindrical probe with the possibility of contact with the test area of the test object, and the unit of measurement and signal processing differential thermocouple contains an electronic amplifier, a differentiator, a storage device, the device is multiplication by a constant factor, a comparator, and an electronic timer, with the output of the differential thermocouple is connected to the input e of the amplifier, and the output of the latter is connected to the differentiator, a storage device and to the first input of the comparator, the output of the differentiator is connected to including the input e of the timer, the output of the storage device is connected to the input of the multiplication by a constant factor, the output of which is connected to the second input of the comparator, the output of which is connected to a switching input e of the timer.

 

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