SU1347090A1 - Device for simulating circulatory system of anatomical organs - Google Patents

Abstract

The invention relates to medical technology. The purpose of the invention is to make it possible to evaluate the parameters of blood circulation by the rheographic method. The device contains an elastic sheath 1, a tube 2, a simulator w of a vascular tree 3 of interchangeable tubes 4, a connecting tee 5. The inlet 6 is connected to the pressure unit 9, and the bushing 7 is connected to the vessel 10. Strain gauges 12 are fixed to the sheath 1 and the vessel 2 which are connected to the mechanical parameters measuring unit 13. On the shell 8 electrodes 14 are installed, which are connected to the electrical resistance measuring unit 15. The pressure, flow rate and volume of the injected liquid are recorded by the control unit 16, Tubes on the tees with glued. or are connected by crimp rings. The device allows one to select the parameters of the impedance blood flow measurement differentially for each specific organ without using direct blood flow measurements on the patient. 1 z.p, f-ly, 2 ill. (L OE SO

Description

15

  .OUTSERVING S (,,,,., Tubes correlate with i additional elastic sheath i

for example, as S gj, | (, 1-1.3) S gx, and

The invention relates to medical technology, more specifically to devices for modeling the circulatory system of anatomical organs.

The purpose of the invention is to provide the possibility of estimating blood circulation parameters by the eographical method.

Fig. 1 schematically shows a device for modeling the circulatory system of anatomical organs; Fig. 2 shows a branch node of tubes simulating blood vessels.

The device for modeling the blood-venous system of the anatomical organs contains an elastic sheath 1 imitating the anatomical organ (liver), an elastic tube 2 imitating a blood vessel, a simulator 3 of a vascular tree from interchangeable elastic tubes 4, a connecting tee 5, an inlet 6 and an output 7 nozzles,

8, and the inlet 6 is connected to the injection unit 9, and the outlet 25 is connected to the vessel 10, which is connected to the injection unit 9 by the pipe 11. The strain gauges 12 are fixed to the shell 1 and the vessel 2, which are connected to the measuring unit 13 - the zone of mechanical parameters; electrodes 14 are mounted on the shell 8, which are connected to the electrical resistance measurement unit 15. The pressure, flow rate and volume of the injected fluid are recorded by the control unit 16.

The elastic shells 1 and 8 and the tubes 2 and 4 are made of a conductive material and are filled with an electrically conductive liquid, the conductivity ratio corresponding to the simulated parts of the organs. The tubes on the tees 5 are glued together or joined by crimping rings 17. The values of the electrical resistivities of the fluids filling the tubes and the cavity of the elastic shell and the additional elastic shell, the material of the tubes, the elastic shell and the additional elastic shell are related, for example, as 1: 2:: 2.5: 2.5: 3: 10-100.

To more accurately simulate volume changes in the vascular bed and distribute them across branching levels, when 3 pulsating or fixed volumes of conductive fluid imitating blood are introduced into the vascular tree simulator, the geometric parameters (length and internal diameter) of tubes 4 for each level are branched on are chosen close and proportional to the actual values of the vessel

 corresponding level of branching in a bioobject. The compliance of the walls of the tubes 4 for each, the branching level is chosen appropriate or

Q portional compliance of walls from vessels of a biological object by varying the thickness of the walls of tubes 4 made of a material with uniform elastic properties. In this case, less compliant tubes of lower branching levels, having a smaller inner diameter, have a greater ratio

7-. Each node branch imitato

vascular tree total cross-sectional area of the incoming S g and

The ratios of the wall thickness L of the tube to the inner diameter d of this tube for a simulator of a vascular tree, for example, are related to five branching levels, for example,

, h,, hch., hs hhh hfh

(j): (t): (t): (t) gSt)

and dji and d d

35

40

45

50

55

1 1 1 J 10987

The peorpafjbi RPG2-02 and RPG-203 are used as a unit for measuring the electrical resistance with the tetra polar switching circuit of electrodes 14.

The device works as follows.

Using the injection unit 9, a pulsed or fixed volume of conductive fluid is introduced into the simulator 3. The pressure, flow rate and volume of injected fluid are recorded by the control unit. In the process of pumping a fluid using a model, the mechanical parameters measurement unit produces pressure control in the system and deformations of the walls of tubes 2 and sheaths 1 and 8. The injected volume of fluid is distributed in the simulator at different branching levels in accordance with the blood distribution in the vascular bed simulated org, since the structure of the simulator 3, the ratio of the geometric and mechanical parameters of the components of the model correspond to the real anatomical and physiological parameters of the circulatory system. Because of this as well

The meters (length and internal diameter) of the tubes 4 for each level are branched and close to the actual values of the vessels.

corresponding level of branching in a bioobject. The compliance of the walls of the tubes 4 for each branching level is selected to correspond to or proportional to the compliance of the walls of the vessels of the biological object by varying the thickness of the walls of the tubes 4 made of a material with uniform elastic properties. In this case, less compliant tubes of lower branching levels, having a smaller inner diameter, have a greater ratio

7-. Each node branch of the simulator

vascular tree total cross-sectional areas of incoming S g and

The ratios of the wall thickness L of the tube to the inner diameter d of this tube for a simulator of a vascular tree, for example, with five branching levels, are related, for example,

5 o

, h,, hch., hs hhh hfh

(j): (t): (t): (t) gSt)

and dji and d d

five

0

five

0

five

Claims (2)

1 1 J 10 9 8 7 6 Peorpafjbi RPG2-02 and RPG-203 are used as a unit for measuring electrical resistance in the tetra-polar circuit for switching on electrodes 14. The device works as follows. Using the injection unit 9, a pulsed or fixed volume of conductive fluid is introduced into the simulator 3. The pressure, flow rate and volume of injected fluid is recorded by block 16 control. In the process of pumping a fluid, the model uses a block 13 for measuring mechanical parameters to control the pressure in the system and the deformation of the walls of tubes 2 and 4 and shells 1 and 8. The volume of fluid introduced is distributed in simulator 3 through different levels of branching in accordance with the blood distribution in the vascular bed of the modeled organ, since the structure of the simulator 3, the ratios of the geometric and mechanical parameters of the components of the model correspond to the actual anatomical and physiological parameters of the circulatory system. Because of this as well also the equivalence of electrical properties of the distribution of the electric field according to the model of a bio-object induced by the electrodes of the electrical resistance measuring unit 14 is close to the actual distribution of the electric field in the test organ when determining its blood flow by the impedance method. Due to this close correspondence between the model and the bio-object with respect to the distribution of the electrically and mechanical properties of the vascular bed and simulator 3 models, conducting experiments on the proposed device allows determining which design and localization of the electrodes 14 and which method of processing the impedance data recorded by measuring unit 15 electrical resistance, it is possible to obtain reliable results by measuring the blood flow of the test organ directly on the patient. The proposed device allows one to select the parameters of the impedance method for measuring blood flow differentially for each specific organ without using direct blood flow measurements. 35 on the patient. This is achieved by selecting a conductive material, the shell cavities and the tube being filled with an electrically conductive liquid. 2. Device pop.1, which differs from the fact that the specific electrical resistance values of the fluid in the tubes, the tube material, the fluid in the shell cavity, the shell material, the fluid in the cavity of the supplementary shell, and the material of the additional shell for modeling the liver as 1: 2: 2.5: 2.5:: 3: (10-100). the structure of the simulator 3 and the shape, material and electrical properties of the membranes 1 and 8, close to the corresponding anatomical parameters of the modeled organ. The use of the proposed device in experimental medicine makes it possible to increase the accuracy of blood flow measurement by the impedance method and thereby significantly reduce the time spent on the examination of the patient. 40 reduce the time of stay of patients in the hospital and significantly increase the accuracy of diagnosis of diseases of the cardiovascular system of the body without the use of dangerous, time-consuming, complex and bloody invasive diagnostic methods. Invention Formula 1. A device for modeling the circulatory system of anatomical organs, comprising an elastic tube, imitating blood vessel, shell, imitating anatomical organ, pumping fluid injection unit and mechanical parameters measuring block; moreover, the elastic tube is placed in the shell, which is different from the fact that, in order to make it possible to evaluate the blood circulation parameters by the rheographic method, it is equipped with electrodes, an electrical resistance measurement unit an additional electrically conductive skin imitating the skin, and the tube has a branching imitating the vascular system and is made of 40 Fig2 E S§ I2E 2iE2222S Compiled by L.Popov -IeJSESS i.P5S Z 2РР§ 1 ° РЛ Е.1.1Ч Order 5122/47 Circulation 432 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4