Blood recirculation device for measuring central venous catheter through ultrasonic dilution method

Abstract

The utility model discloses a blood recirculation device for measuring a central venous catheter by using an ultrasonic dilution method, which relates to the technical field of medical instruments and comprises a pipeline model, an imitation pipe is arranged in the pipeline model, a liquid inlet pipe and a liquid outlet pipe are respectively arranged at the top of the imitation pipe, a first circulating pipe is fixedly connected to the end part of the liquid inlet pipe, and a second circulating pipe is fixedly connected to the end part of the liquid outlet pipe. A dilution pipe is fixedly connected to one side of the top end of the vein kettle, a second circulating pipe is fixedly connected to the bottom end of the vein kettle, the other end of the U-shaped pipe is located at the bottom of the bottom end of the first circulating pipe, a dispersion cover is fixedly connected to the ends of the two fixing rods jointly, and a first inclined plate is fixedly connected to the top end of one side in the vein kettle. A second inclined plate is fixedly connected to the bottom end of the side, away from the first inclined plate, of the interior of the vein pot, and a set of Y-shaped holes are formed in the top end of the first inclined plate, so that the device is beneficial to improving the mixing uniformity between blood and normal saline, and the situation that the content of the normal saline in the blood is different, and the final detection result is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a blood recirculation device for measuring a central venous catheter using an ultrasonic dilution method. Background Art

[0002] During hemodialysis, blood is introduced into the dialysis machine through the vascular access and returned to the body after purification. If part of the dialyzed blood returns to the entrance of the extracorporeal circulation circuit, that is, the dialyzed blood flows backward from the venous end to the arterial end, this part of the reverse blood flow constitutes vascular access recirculation. The existence of access recirculation can weaken the efficiency of hemodialysis and affect the adequacy of dialysis. Therefore, it is of great significance to detect and measure access recirculation. The central venous catheter is an important vascular access for hemodialysis, and the recirculation rate of the catheter is one of the important performance indicators of the catheter.

[0003] Through patent search, it was found that a central venous catheter measurement device and method with publication number CN109781858A includes: a lumen model, which is constructed to simulate a human vein and into which a central venous catheter is inserted and removed; a vascular circuit component, which is constructed to form a vascular circuit simulating a human body with the lumen model, and the vascular circuit component controls the fluid state of the fluid in the vascular circuit according to preset parameters; a dialysis circuit component, which is constructed to form a dialysis circuit that is detachable from the input interface and the output interface of the central venous catheter, and the dialysis circuit component is configured to purify the fluid passing through the dialysis circuit; and a detection component, which is configured to detect the probability of the purified fluid returning from the vascular circuit to the dialysis circuit again under the current fluid state.

[0004] Although the above patent detects the probability of the purified fluid returning from the vascular circuit to the dialysis circuit again, it is difficult to ensure that the saline is fully mixed with the blood after adding saline into the venous bottle, which can easily lead to different saline contents at different positions in the blood, thereby affecting the final test results. Therefore, a blood recirculation device for measuring the central venous catheter by ultrasonic dilution method is needed to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide a blood recirculation device for measuring central venous catheters by an ultrasonic dilution method.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a blood recirculation device for measuring central venous catheter by ultrasonic dilution method, comprising a pipeline model, a simulated tube is arranged inside the pipeline model, a liquid inlet tube and a liquid discharge tube are arranged on the top of the simulated tube respectively, an ultrasonic detector is installed on the liquid inlet tube and the liquid discharge tube together, a circulation tube 1 is fixedly connected to the end of the liquid inlet tube, a dialyzer peristaltic pump, a dialyzer and a venous pot are sequentially installed on the circulation tube 1, a dilution tube is fixedly connected to one side of the top end of the venous pot, a circulation tube 2 is fixedly connected to the bottom end of the venous pot, and the top end of the circulation tube 2 is fixedly connected to the liquid discharge tube, and a mixing mechanism is arranged inside the venous pot;

[0007] The mixing mechanism includes a U-shaped tube fixedly connected to the bottom end of the dilution tube, the other end of the U-shaped tube is located at the bottom of the bottom end of the circulation tube, the front and rear sides of the interior of the venous pot are fixedly connected with fixing rods, the ends of the two fixing rods are commonly fixedly connected with a dispersion cover, the top of one side of the interior of the venous pot is fixedly connected with an inclined plate 1, the bottom end of the side of the interior of the venous pot away from the inclined plate 1 is fixedly connected with an inclined plate 2, and a group of Y-shaped holes are opened at the top of the inclined plate 1.

[0008] Preferably, a circulation pipe three is provided at the top of the pipeline model, and the bottom end of the circulation pipe three is fixedly connected to the bottom end of the pipeline model, a circulation pump is fixedly connected to the circulation pipe three, a fluid replenishment pot is provided at the top of the circulation pipe three, and the drainage end of the fluid replenishment pot is fixedly connected to the circulation pipe three, a fluid replenishment pump is provided at the bottom of the fluid replenishment pot, and the pumping end of the fluid replenishment pump is fixedly connected to the fluid replenishment pot, a detection tube is fixedly connected to the tube body of the circulation pipe three, and a flow sensor is fixedly connected to the bottom end inside the detection tube.

[0009] Preferably, a sphere is fixedly connected to the tube body of the circulation tube 2, and a temperature sensor 1 is installed on one side of the sphere.

[0010] Preferably, a heating chamber is fixedly connected to the outer side of the circulation pipe 3, a heating plate is fixedly connected to the top of the interior of the heating chamber, and a temperature sensor 2 is installed on the top of the heating chamber.

[0011] Preferably, solenoid valve 1 and solenoid valve 2 are fixedly connected to the tube bodies of the liquid inlet pipe and the liquid discharge pipe, respectively, and solenoid valve 3 is installed at the bottom end of the circulation pipe 3.

[0012] Preferably, a controller is provided on the front side of the pipeline model, and the controller is electrically connected to the ultrasonic detector, the dialyzer peristaltic pump, the dialyzer, the circulating pump, the flow sensor, the temperature sensor 1, the heating plate, the temperature sensor 2, the solenoid valve 1, the solenoid valve 2 and the solenoid valve 3 respectively.

[0013] Preferably, a connector is fixedly connected to the top end of the dilution tube, and the bottom end of the intravenous pot is triangular in shape.

[0014] Beneficial effects:

[0015] Compared with the prior art, the device for measuring the blood recirculation of central venous catheter by ultrasonic dilution method has the following beneficial effects:

[0016] The utility model can detect the probability of the blood purified in hemodialysis entering the central venous catheter again through the ultrasonic detector, the peristaltic pump of the dialyzer draws the blood in the pipeline model through the liquid inlet tube, and then the dialyzer purifies the blood, and then circulates it into the pipeline model through the circulation tube 2, when the physiological saline is injected into the venous pot through the dilution tube, due to the design of the U-shaped tube, the physiological saline collides and merges with the flowing blood, and then under the action of the dispersion cover, the blood and the physiological saline are dispersed to the inclined plate 1 and the inclined plate 2 respectively, and part of the blood and the physiological saline falling on the inclined plate 1 will flow into the Y-shaped hole, and flow to the holes in the lower part through the two holes at the top of the Y-shaped hole, which is conducive to the mixing of the blood and the physiological saline, and the other part of the blood and the physiological saline flow along the inclined plate 1 to the inclined plate 2, and mix with the blood and the physiological saline falling from the dispersion cover on the inclined plate 2, so that the device is conducive to improving the mixing uniformity between the blood and the physiological saline, and avoiding the different content of the physiological saline in the blood, which affects the final detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 3 It is a cross-sectional structural diagram of the mixing mechanism in the utility model;

[0020] Figure 4 For this utility model Figure 3 A local enlarged schematic diagram of point A in the figure.

[0021] In the figure: 1. pipeline model; 2. imitation pipe; 3. liquid inlet pipe; 300, ultrasonic detector; 4. liquid discharge pipe; 5. circulation pipe 1; 6. peristaltic pump of dialysis machine; 7. dialysis machine; 8. intravenous pot; 9. dilution tube; 10. circulation pipe 2; 11. mixing mechanism; 111. U-shaped pipe; 112. fixing rod; 113. dispersion cover; 114. inclined plate 1; 115. inclined plate 2; 116. Y-shaped hole; 12. circulation pipe 3; 13. circulation pump; 14. infusion pot; 15. infusion pump; 16. detection tube; 17. flow sensor; 18. sphere; 19. temperature sensor 1; 20. heating chamber; 21. heating plate; 22. temperature sensor 2; 23. solenoid valve 1; 24. solenoid valve 2; 25. solenoid valve 3; 26. controller; 27. connector. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] like Figure 1 to Figure 4 As shown, a blood recirculation device for measuring central venous catheter by ultrasonic dilution method comprises a pipeline model 1, a simulated tube 2 is arranged inside the pipeline model 1, and a liquid inlet tube 3 and a liquid discharge tube 4 are arranged on the top of the simulated tube 2. Solenoid valve 1 23 and solenoid valve 2 24 are fixedly connected to the tube bodies of the liquid inlet tube 3 and the liquid discharge tube 4, respectively, and a solenoid valve 3 25 is installed at the bottom end of the circulation tube 3 12. The design of the solenoid valve 1 23, the solenoid valve 2 24 and the solenoid valve 3 25 facilitates the opening and closing of the tube body. An ultrasonic detector 300 is installed together with the liquid inlet tube 3 and the liquid discharge tube 4, and a circulation tube 1 5 is fixedly connected to the end of the liquid inlet tube 3, and a dialyzer peristaltic pump 6, a dialyzer 7 and a venous pot 8 are respectively installed on the circulation tube 1 5 in sequence, a dilution tube 9 is fixedly connected to one side of the top of the venous pot 8, and a circulation tube 2 10 is fixedly connected to the bottom end of the venous pot 8, and the top of the circulation tube 2 10 is fixedly connected to the liquid discharge tube 4. A ball 18 is fixedly connected to the body of the circulation tube 10, and a temperature sensor 19 is installed on one side of the ball 18. The temperature sensor 19 detects the temperature of the blood mixed with the physiological saline in real time. A mixing mechanism 11 is provided in the intravenous pot 8;

[0024] The mixing mechanism 11 includes a U-shaped tube 111 fixedly connected to the bottom end of the dilution tube 9, and the other end of the U-shaped tube 111 is located at the bottom of the bottom end of the circulation tube 1 5. A connector 27 is fixedly connected to the top of the dilution tube 9, and the bottom end of the intravenous pot 8 is triangular, and the connector 27 is convenient for connecting with the pipeline for injecting physiological saline from the outside. Fixed rods 112 are fixedly connected to both sides of the front and back of the intravenous pot 8, and the ends of the two fixed rods 112 are fixedly connected to a dispersion cover 113. The top of one side of the intravenous pot 8 is fixedly connected to an inclined plate 1 14, and the bottom of the intravenous pot 8 away from the inclined plate 1 14 is fixedly connected to an inclined plate 2 115. A group of Y-shaped holes 116 are opened at the top of the inclined plate 1 14.

[0025] When in use, the pipeline model 1 is used to simulate the internal jugular vein or femoral vein of the human body, simulating the vein structure to the maximum extent. The ultrasonic detector 300 can measure the probability that the blood purified in hemodialysis will enter the central venous catheter again. The dialyzer peristaltic pump 6 absorbs the blood in the pipeline model 1 through the liquid inlet tube 3, and then the dialyzer 7 purifies the blood, and then circulates it to the pipeline model 1 through the circulation tube 2 10. When physiological saline is injected into the venous pot 8 through the dilution tube 9, due to the design of the U-shaped tube 111, the physiological saline collides and merges with the flowing blood, and then under the action of the dispersion cover 113, the blood and the biological The physiological saline is dispersed onto the inclined plate 1 14 and the inclined plate 115 respectively. Part of the blood and the physiological saline falling on the inclined plate 1 14 will flow into the Y-shaped hole 116, and flow to the holes at the bottom through the two holes at the top of the Y-shaped hole 116, which is conducive to the mixing of the blood and the physiological saline. The other part of the blood and the physiological saline flows along the inclined plate 1 14 to the inclined plate 2 115, and mixes with the blood and the physiological saline falling from the dispersion cover 113 on the inclined plate 2 115. Therefore, the device is conducive to improving the mixing uniformity between the blood and the physiological saline, avoiding the uneven content of the physiological saline in the blood, which affects the final test result.

[0026] A circulation pipe 3 12 is provided at the top of the pipeline model 1, and the bottom end of the circulation pipe 3 12 is fixedly connected to the bottom end of the pipeline model 1. A heating chamber 20 is fixedly connected to the outside of the circulation pipe 3 12, a heating plate 21 is fixedly connected to the top of the heating chamber 20, a temperature sensor 22 is installed on the top of the heating chamber 20, the heating plate 21 heats the blood temperature so that it is always in a suitable constant temperature state, and the temperature sensor 22 is convenient for detecting the temperature inside the heating chamber 20. A circulation pump 13 is fixedly connected to the circulation pipe 3 12, a fluid infusion pot 14 is provided at the top of the circulation pipe 3 12, and the drainage end of the fluid infusion pot 14 is fixedly connected to the circulation pipe 3 12, a fluid infusion pump 15 is provided at the bottom of the fluid infusion pot 14, and the pumping end of the fluid infusion pump 15 is fixedly connected to the fluid infusion pot 14, a detection tube 16 is fixedly connected to the tube body of the circulation pipe 3 12, and a flow sensor 17 is fixedly connected to the bottom end of the detection tube 16. A controller 26 is provided on the front side of the pipeline model 1, and the controller 26 is electrically connected to the ultrasonic detector 300, the dialyzer peristaltic pump 6, the dialyzer 7, the circulating pump 13, the flow sensor 17, the temperature sensor 19, the heating plate 21, the temperature sensor 22, the solenoid valve 1 23, the solenoid valve 2 24 and the solenoid valve 3 25, which is conducive to improving the degree of automation and unified centralized management.

[0027] When in use, the pipeline model 1, the circulation tube three 12, the circulation pump 13 and the detection tube 16 form a vascular circulation loop, and the flow sensor 17 monitors the blood flow in real time. When the blood flow decreases, the infusion pump 15 draws the blood in the infusion pot 14 into the circulation tube three 12, thereby eliminating the loss of blood after passing through the dialysis circuit and the central venous catheter.

[0028] Working principle: The pipeline model 1 is used to simulate the internal jugular vein or femoral vein of the human body, simulating the vein structure to the maximum extent. The ultrasonic detector 300 can measure the probability that the purified blood in hemodialysis will enter the central venous catheter again. The peristaltic pump 6 of the dialyzer draws the blood in the pipeline model 1 through the liquid inlet tube 3, and then the dialyzer 7 purifies the blood, and then circulates it to the pipeline model 1 through the circulation tube 10. When physiological saline is injected into the venous pot 8 through the dilution tube 9, due to the design of the U-shaped tube 111, the physiological saline collides and merges with the flowing blood, and then under the action of the dispersion cover 113, the blood and the biological The physiological saline is dispersed onto the inclined plate 1 14 and the inclined plate 115 respectively. Part of the blood and the physiological saline falling on the inclined plate 1 14 will flow into the Y-shaped hole 116, and flow to the holes at the bottom through the two holes at the top of the Y-shaped hole 116, which is conducive to the mixing of the blood and the physiological saline. The other part of the blood and the physiological saline flows along the inclined plate 1 14 to the inclined plate 2 115, and mixes with the blood and the physiological saline falling from the dispersion cover 113 on the inclined plate 2 115. Therefore, the device is conducive to improving the mixing uniformity between the blood and the physiological saline, avoiding the uneven content of the physiological saline in the blood, which affects the final test result.

[0029] The pipeline model 1, the circulation tube three 12, the circulation pump 13 and the detection tube 16 form a vascular circulation loop, and the flow sensor 17 monitors the blood flow in real time. When the blood flow decreases, the infusion pump 15 draws the blood in the infusion pot 14 into the circulation tube three 12, thereby eliminating the loss of blood after passing through the dialysis circuit and the central venous catheter.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blood recirculation device for measuring central venous catheter by ultrasonic dilution method, comprising a pipeline model (1), characterized in that: The pipeline model (1) is provided with a simulated tube (2) inside, and the top of the simulated tube (2) is respectively provided with a liquid inlet tube (3) and a liquid discharge tube (4), and the liquid inlet tube (3) and the liquid discharge tube (4) are jointly installed with an ultrasonic detector (300), and the end of the liquid inlet tube (3) is fixedly connected with a circulation tube 1 (5), and the circulation tube 1 (5) is sequentially installed with a dialyzer peristaltic pump (6), a dialyzer (7) and a venous pot (8), and a dilution tube (9) is fixedly connected to one side of the top of the venous pot (8), and the bottom of the venous pot (8) is fixedly connected with a circulation tube 2 (10), and the top of the circulation tube 2 (10) is fixedly connected to the liquid discharge tube (4), and a mixing mechanism (11) is provided inside the venous pot (8); The mixing mechanism (11) comprises a U-shaped tube (111) fixedly connected to the bottom end of the dilution tube (9), the other end of the U-shaped tube (111) is located at the bottom of the bottom end of the circulation tube 1 (5), the front and rear sides of the interior of the venous pot (8) are fixedly connected with fixing rods (112), the ends of the two fixing rods (112) are commonly fixedly connected with a dispersion cover (113), the top end of one side of the interior of the venous pot (8) is fixedly connected with an inclined plate 1 (114), the bottom end of the interior of the venous pot (8) away from the inclined plate 1 (114) is fixedly connected with an inclined plate 2 (115), and the top end of the inclined plate 1 (114) is provided with a group of Y-shaped holes (116).

2. The blood recirculation device for measuring central venous catheter by ultrasonic dilution method according to claim 1, characterized in that: A circulation pipe three (12) is provided at the top of the pipeline model (1), and the bottom end of the circulation pipe three (12) is fixedly connected to the bottom end of the pipeline model (1); a circulation pump (13) is fixedly connected to the circulation pipe three (12); a liquid replenishment pot (14) is provided at the top of the circulation pipe three (12), and the drainage end of the liquid replenishment pot (14) is fixedly connected to the circulation pipe three (12); a liquid replenishment pump (15) is provided at the bottom of the liquid replenishment pot (14), and the suction end of the liquid replenishment pump (15) is fixedly connected to the liquid replenishment pot (14); a detection tube (16) is fixedly connected to the tube body of the circulation pipe three (12), and a flow sensor (17) is fixedly connected to the bottom end inside the detection tube (16).

3. The blood recirculation device for measuring central venous catheter by ultrasonic dilution method according to claim 1, characterized in that: A spherical ball (18) is fixedly connected to the pipe body of the circulation pipe 2 (10), and a temperature sensor 1 (19) is installed on one side of the spherical ball (18).

4. The blood recirculation device for measuring central venous catheter by ultrasonic dilution method according to claim 2, characterized in that: The outer side of the circulation pipe three (12) is fixedly connected to a heating chamber (20), the top of the interior of the heating chamber (20) is fixedly connected to a heating plate (21), and the top of the heating chamber (20) is installed with a temperature sensor two (22).

5. The blood recirculation device for measuring central venous catheter by ultrasonic dilution method according to claim 4, characterized in that: The liquid inlet pipe (3) and the liquid discharge pipe (4) are respectively fixedly connected with a solenoid valve 1 (23) and a solenoid valve 2 (24), and the bottom end of the circulation pipe 3 (12) is provided with a solenoid valve 3 (25).

6. The blood recirculation device for measuring central venous catheter by ultrasonic dilution method according to claim 5, characterized in that: A controller (26) is provided on the front side of the pipeline model (1), and the controller (26) is electrically connected to the ultrasonic detector (300), the dialysis machine peristaltic pump (6), the dialysis machine (7), the circulation pump (13), the flow sensor (17), the temperature sensor 1 (19), the heating plate (21), the temperature sensor 2 (22), the solenoid valve 1 (23), the solenoid valve 2 (24) and the solenoid valve 3 (25).

7. The blood recirculation device for measuring central venous catheter by ultrasonic dilution method according to claim 1, characterized in that: The top end of the dilution tube (9) is fixedly connected with a connector (27), and the bottom end of the intravenous pot (8) is triangular in shape.

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