Heart valve prosthesis steady-state flow testing machine

Abstract

The invention relates to a steady-state flow testing machine for an artificial heart valve. The steady-state flow testing machine comprises a forward flow testing loop formed by sequentially connecting a liquid storage system, a circulating pump, a rectifying system, a testing clamping system and a forward flow return pipe, and an anti-leakage return pipe connected between the testing clamping system and the liquid storage system, the test clamping system comprises a front-end fixed cavity, a rear-end movable cavity and a valve carrier mounted at the connecting end of the front-end fixed cavity and the rear-end movable cavity, and pressure sensors are mounted on the front-end fixed cavity and the rear-end movable cavity respectively; and the forward flow return pipe and the reverse leakage return pipe are respectively provided with a flow sensor. Forward flow and reverse leakage are detected through independent flow sensors respectively, meanwhile, the precision of forward flow testing and reverse leakage testing is guaranteed, and the accuracy of the testing result is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial heart valve testing, and in particular relates to an artificial heart valve steady-state flow testing machine. Background Art

[0002] The steady-state flow test is one of the important methods used to evaluate the performance of artificial heart valves. It simulates the in vivo environment and accurately measures the performance of the valve under different working conditions by controlling parameters such as flow rate and pressure. This test is of great significance in guiding doctors to select the most suitable artificial heart valve for patients, evaluating the biocompatibility and durability of the valve, and guiding the research and development of new artificial heart valves. The steady-state flow test of artificial heart valves is divided into forward flow test and reverse leakage test. The forward flow test simulates the quasi-steady flow state during the peak period of ventricular ejection and tests the forward flow resistance performance of the valve; the reverse leakage test simulates the leakage state after the valve is completely closed and measures the closing quality of the valve.

[0003] Existing steady-state flow test devices generally use the same flow sensor to test the forward flow and reverse leakage flow, but the measured flow ranges in the forward flow and reverse leakage tests are very different, which directly leads to poor test accuracy and affects the accuracy of the test results. Summary of the invention

[0004] The purpose of the present invention is to provide an artificial heart valve steady-state flow testing machine to solve the problem of poor testing accuracy.

[0005] An artificial heart valve steady-state flow tester of the present invention is implemented as follows:

[0006] An artificial heart valve steady-state flow tester comprises a forward flow test loop formed by sequentially connecting a liquid storage system, a circulation pump, a rectifying system, a test clamping system and a forward flow return pipe, and an anti-leakage return pipe connected between the test clamping system and the liquid storage system;

[0007] The test clamping system comprises a front-end fixed cavity and a rear-end movable cavity, and a valve carrier installed at the connecting ends of the two, and pressure sensors are installed on the front-end fixed cavity and the rear-end movable cavity respectively;

[0008] Flow sensors are installed on the forward flow return pipe and the reverse leakage return pipe respectively.

[0009] Furthermore, a rear end ball valve is installed between the rear end moving cavity and the forward flow return pipe, an anti-leakage ball valve is installed between the rear end moving cavity and the anti-leakage return pipe, and a liquid inlet ball valve is installed between the rectifier system and the forward flow return pipe.

[0010] Further, the rectification system and the test clamping system are arranged side by side on the front side of a base, and the circulation pump is arranged below the rectification system;

[0011] The forward flow return pipe is arranged horizontally on the rear side of the base and one end of it is connected to the liquid storage system located on one side of the base. The anti-leakage return pipe is arranged horizontally below the rectification system and the test clamping system and one end of it is connected to the liquid storage system and the other end is connected to the rear end movable cavity.

[0012] Furthermore, the liquid storage system includes a liquid storage tank body, an upper cover assembly I installed on the top of the liquid storage tank body, and a lower cover assembly I installed on the bottom of the liquid storage tank body;

[0013] The upper cover assembly I comprises an upper cover I, and a forward flow return water port and a reverse leakage return water port arranged on the side of the upper cover I, and a water injection port closed by a plug is arranged above the upper cover I;

[0014] The lower cover assembly I comprises a lower cover I, and a heating rod, a temperature sensor and a liquid level sensor arranged in the lower cover I. A drain valve and a water outlet I are arranged on the side of the lower cover I.

[0015] Furthermore, the rectification system includes a rectification tank body, an upper cover assembly II installed on the top of the rectification tank body, and a lower cover assembly II installed on the bottom of the rectification tank body;

[0016] The upper cover assembly II includes an upper cover II and a rectifying exhaust valve arranged on the upper cover II;

[0017] The lower cover assembly II comprises a lower cover II, a water outlet II arranged on one side of the lower cover II, and a water inlet at the bottom of the lower cover II.

[0018] Furthermore, the rear end movable cavity can move relative to the front end fixed cavity to match or separate the two.

[0019] Furthermore, a linear guide rail is provided on the rear side of the rear end moving cavity, and a slider assembled on the linear guide rail is provided on the rear wall of the rear end moving cavity;

[0020] A limit stopper is arranged at one end of the linear guide rail away from the front end fixed cavity.

[0021] Furthermore, the front fixed cavity and the rear movable cavity are connected by a lock.

[0022] Furthermore, exhaust valves are respectively provided on the tops of the front fixed cavity and the rear movable cavity.

[0023] Furthermore, a water collecting box is provided below the test clamping system.

[0024] After adopting the above technical solution, the present invention has the following beneficial effects:

[0025] The forward flow and reverse leakage of the present invention are detected by separate flow sensors respectively, which ensures the accuracy of the forward flow test and the reverse leakage test and improves the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 is a structural diagram of a first-view of an artificial heart valve steady-state flow testing machine according to a preferred embodiment of the present invention;

[0028] Figure 2 is a structural diagram of the artificial heart valve steady-state flow testing machine according to a preferred embodiment of the present invention from a second viewing angle;

[0029] Figure 3 is an exploded view of a liquid storage system of an artificial heart valve steady-state flow testing machine according to a preferred embodiment of the present invention;

[0030] Figure 4 is an exploded view of a rectifier system of an artificial heart valve steady-state flow tester according to a preferred embodiment of the present invention;

[0031] Figure 5 It is a structural diagram of the test clamping system of the artificial heart valve steady-state flow tester according to the preferred embodiment of the present invention from a first perspective;

[0032] Figure 6 It is a structural diagram of the test clamping system of the artificial heart valve steady-state flow tester according to the preferred embodiment of the present invention from a second viewing angle;

[0033] Figure 7 It is a front view of a test clamping system of an artificial heart valve steady-state flow tester according to a preferred embodiment of the present invention;

[0034] Figure 8 yes Figure 7 Cross-section view in the AA direction;

[0035] Fig. 9 is a top view of a test clamping system of an artificial heart valve steady-state flow tester according to a preferred embodiment of the present invention;

[0036] Fig.10 yes Fig. 9 Cross-section along the middle BB direction;

[0037] Fig.11 is a structural diagram of a base of an artificial heart valve steady-state flow testing machine according to a preferred embodiment of the present invention;

[0038] In the figure:

[0039] Liquid storage system 1, liquid storage tank body 1-1, support rod Ⅰ 1-2, upper cover Ⅰ 1-3, forward flow return water port 1-4, reverse leakage return water port 1-5, water injection port 1-6, plug 1-7, lower cover Ⅰ 1-8, heating rod 1-9, temperature sensor 1-10, liquid level sensor 1-11, drain valve 1-12, water outlet Ⅰ 1-13, base 1-14, base plate 1-15, vertical partition 1-16, sealing ring Ⅰ 1-17, circulation pump 2, rectification system 3, liquid inlet ball valve 3-1, rectification tank body 3-2, support rod Ⅱ 3-3, upper cover Ⅱ 3-4, rectification exhaust valve 3-5, lower cover Ⅱ 3-6, water outlet Ⅱ 3-7, water inlet 3-8, sealing ring Ⅱ 3-9, test clamping system 4, Front end fixed cavity 4-1, rear end movable cavity 4-2, rear end ball valve 4-3, anti-leakage ball valve 4-4, accommodating cavity 4-5, linear guide 4-6, slider 4-7, fixed plate 4-8, limit block 4-9, lock 4-10, front end exhaust valve 4-11, rear end exhaust valve 4-12, front end pressure sensor 4-13, rear end pressure sensor 4-14, forward flow return pipe 5, anti-leakage return pipe 6, base 7, bottom plate 7-1, vertical plate 7-2, angle seat 7-3, rectifier support frame 7-4, forward flow return pipe bracket 7-5, forward flow flow sensor 8, anti-leakage flow sensor 9, water outlet pipe 10, water supply pipe 11, water inlet pipe 12, water receiving box 13, valve carrier 14,. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1-11As shown, an artificial heart valve steady-state flow test machine includes a forward flow test circuit formed by connecting a liquid storage system 1, a circulation pump 2, a rectification system 3, a test clamping system 4 and a forward flow return pipe 5 in sequence, and an anti-leakage return pipe 6 connected between the test clamping system 4 and the liquid storage system 1; the test clamping system 4 includes a front-end fixed cavity 4-1 and a rear-end movable cavity 4-2, and a valve carrier 14 installed at the connecting end of the two, and pressure sensors are installed on the front-end fixed cavity 4-1 and the rear-end movable cavity 4-2 respectively; flow sensors are installed on the forward flow return pipe 5 and the anti-leakage return pipe 6 respectively.

[0043] When replacing the test sample (artificial heart valve), the existing steady-state flow testing machine needs to drain the test liquid inside it, which takes a long time to wait and directly affects the test efficiency. In order to solve this problem, a rear end ball valve 4-3 is installed between the rear end moving cavity 4-2 and the forward flow reflux pipe 5, an anti-leakage ball valve 4-4 is installed between the rear end moving cavity 4-2 and the anti-leakage reflux pipe 6, and a liquid inlet ball valve 3-1 is installed between the rectifier system 3 and the forward flow reflux pipe 5.

[0044] When replacing the test sample, close the rear end ball valve 4-3, the anti-leakage ball valve 4-4 and the liquid inlet ball valve 3-1, open the test fixture clamping system, and then only discharge the test liquid in the test clamping system 4 to replace the test sample.

[0045] Existing steady-state flow testing machines are generally arranged in a flat manner, which occupies a large space. In order to solve this problem, the steady-state flow testing machine of the present invention adopts a vertical structure, which is not only convenient to operate but also occupies a small space.

[0046] like Figure 1-2 and Fig.11 As shown, in order to realize the installation of the sorting system and the test clamping system 4 , the rectifying system 3 and the test clamping system 4 are arranged side by side on the front side of a base 7 , and the circulating pump 2 is arranged below the rectifying system 3 .

[0047] The base 7 includes a bottom plate 7-1 and a vertical plate 7-2 mounted on the bottom plate 7-1, and the bottom plate 7-1 and the vertical plate 7-2 form an inverted T-shaped structure. The vertical plate 7-2 is fixed to the bottom plate 7-1 through a plurality of angle seats 7-3.

[0048] In this embodiment, the rectifying system 3 and the test clamping system 4 are arranged on the front wall of the vertical plate 7 - 2 from left to right in sequence, and the circulating pump 2 is located below the rectifying system 3 and fixed on the bottom plate 7 - 1 .

[0049] Specifically, a pair of rectifier support frames 7 - 4 are installed on the front wall of the vertical plate 7 - 2 , and the rectifier system 3 is fixed on the rectifier support frames 7 - 4 .

[0050] The test clamping system 4 is directly mounted on the front wall of the vertical plate 7-2 through screws and other connecting parts.

[0051] Preferably, the bottom of the bottom plate 7 - 1 is provided with feet to ensure the stability of the base 7 .

[0052] In order to realize the installation of the forward flow return pipe 5 and the anti-leakage return pipe 6, the forward flow return pipe 5 is arranged horizontally on the rear side of the base 7 and one end of it is connected to the liquid storage system 1 located on one side of the base 7, and the anti-leakage return pipe 6 is arranged horizontally below the rectification system 3 and the test clamping system 4 and one end of it is connected to the liquid storage system 1, and the other end is connected to the rear end movable cavity 4-2.

[0053] In this embodiment, the liquid storage system 1 is located on the left side of the base 7 .

[0054] Two forward flow return pipe brackets 7-5 are arranged on the rear wall of the vertical plate 7-2, and the forward flow return pipe 5 is fixed on the forward flow return pipe bracket 7-5; the right end of the forward flow return pipe 5 is connected to the rear end moving cavity 4-2, and the left end is connected to the liquid storage system 1.

[0055] The forward flow flow sensor 8 installed on the forward flow return pipe 5 is located on the forward flow return pipe 5 between the two forward flow return pipe brackets 7 - 5 .

[0056] Preferably, the forward flow return pipe bracket 7-5 uses two bracket plates with arc grooves on opposite sides, the two bracket plates are connected by screws, and the forward flow return pipe 5 is installed in the through hole formed by the two arc grooves.

[0057] The right end of the anti-leakage reflux pipe 6 is connected to the rear end moving cavity 4 - 2 , and the left end is connected to the liquid storage system 1 .

[0058] The anti-leakage flow sensor 9 installed on the anti-leakage return pipe 6 is fixed to the front wall of the vertical plate 7 - 2 by screws, so that the stability of the entire anti-leakage return pipe 6 can be ensured.

[0059] like Figure 3 As shown, in order to store and heat the test liquid, the liquid storage system 1 includes a liquid storage tank body 1-1, an upper cover assembly I installed on the top of the liquid storage tank body 1-1, and a lower cover assembly I installed on the bottom of the liquid storage tank body 1-1.

[0060] In order to ensure the stability of the liquid storage tank body 1-1, a plurality of support rods Ⅰ1-2 are installed between the upper cover assembly Ⅰ and the lower cover assembly Ⅰ.

[0061] Specifically, the upper cover assembly I includes an upper cover I1-3, and a forward flow return water port 1-4 and a reverse leakage return water port 1-5 arranged on the side of the upper cover I1-3, and a water injection port 1-6 closed by a plug 1-7 is arranged above the upper cover I1-3.

[0062] The forward flow return water port 1-4 is used to connect the forward flow return water pipe 5. In this embodiment, the forward flow return water port 1-4 is located on the rear side of the upper cover Ⅰ1-3, which is convenient for connection with the forward flow return water pipe 5 located on the rear side of the vertical plate 7-2.

[0063] The anti-leakage return water port 1-5 is used to connect the anti-leakage return pipe 6. In this embodiment, the anti-leakage return pipe 6 is located on the right side of the upper cover Ⅰ1-3, so as to be connected with the anti-leakage return pipe 6 located on the front side of the vertical plate 7-2.

[0064] The water injection port 1-6 is used to add the test liquid into the liquid storage tank body 1-1 to prevent the heating rod 1-9 from drying out, and the plug 1-7 is used to seal the water injection port 1-6.

[0065] Specifically, the lower cover assembly I includes a lower cover I1-8, and a heating rod 1-9, a temperature sensor 1-10 and a liquid level sensor 1-11 arranged in the lower cover I1-8, and a drain valve 1-12 and a water outlet I1-13 are arranged on the side of the lower cover I1-8.

[0066] The heating rods 1-9 are used to heat the test liquid to the temperature required for the test.

[0067] The temperature sensor 1-10 is used to detect whether the temperature of the test liquid reaches the set value.

[0068] The liquid level sensor 1-11 is used to monitor the liquid level changes of the test liquid in the liquid storage tank body 1-1 in real time. The heating rod 1-9 can only work after the liquid level of the test liquid injected into the liquid storage tank body 1-1 is above the top of the liquid level sensor 1-11.

[0069] The drain valve 1-12 is used to discharge the test liquid in the liquid storage tank body 1-1. In this embodiment, the drain valve 1-12 is located on the front side of the lower cover Ⅰ1-8.

[0070] The water outlet Ⅰ1-13 is used to connect the circulation pump 2, and the test liquid is sent into the rectification system 3 and the test clamping system 4 through the circulation pump 2. In this embodiment, the water outlet Ⅰ1-13 is located on the right side of the lower cover Ⅰ1-8, which is convenient for connecting with the circulation pump 2 under the rectification system 3 using the water outlet pipe 10.

[0071] In order to make the height of the liquid storage system 1 compatible with the forward flow return pipe 5, the reverse leakage return pipe 6 and the circulation pump 2, the lower cover assembly I also includes a base 1-14, the base 1-14 includes a base plate 1-15, and two vertical partitions 1-16 located between the lower cover I 1-8 and the base plate 1-15, wherein the wiring terminals of the heating rod 1-9, the temperature sensor 1-10 and the liquid level sensor 1-11 are located between the two vertical partitions 1-16. Therefore, the setting of the base 1-14 can also facilitate the connection of the heating rod 1-9, the temperature sensor 1-10 and the liquid level sensor 1-11 with the corresponding electrical components.

[0072] Preferably, sealing rings Ⅰ1-17 are respectively provided between the upper cover Ⅰ1-3 and the liquid storage tank body 1-1, and between the lower cover Ⅰ1-8 and the liquid storage tank body 1-1, so as to ensure the sealing of the liquid storage system 1.

[0073] like Figure 4 As shown, the rectifying system 3 is to reduce the influence of turbulence and eddy current during the test of the steady-state flow test machine to ensure the accuracy of the test results, wherein the rectifying system 3 includes a rectifying tank body 3-2, an upper cover assembly II installed on the top of the rectifying tank body 3-2, and a lower cover assembly II installed on the bottom of the rectifying tank body 3-2.

[0074] In order to ensure the stability of the rectifying tank body 3-2, a plurality of support rods II3-3 are installed between the upper cover assembly II and the lower cover assembly II.

[0075] Specifically, the upper cover assembly II includes an upper cover II 3 - 4 and a rectifying exhaust valve 3 - 5 arranged on the upper cover II 3 - 4 .

[0076] When the test liquid is sent from the liquid storage system 1 into the rectifying tank body 3-2, the rectifying exhaust valve 3-5 on the upper cover II 3-4 can be used to discharge the gas in the rectifying tank body 3-2, that is, the test liquid level height in the rectifying tank body 3-2 is adjusted by the rectifying exhaust valve 3-5 to reduce the influence of turbulence and eddy current on the test experiment.

[0077] Specifically, the lower cover assembly II includes a lower cover II 3-6, a water outlet II 3-7 disposed on one side of the lower cover II 3-6, and a water inlet 3-8 at the bottom of the lower cover II 3-6.

[0078] The water outlet II 3-7 is used to connect the test clamping system 4. In this embodiment, the water outlet II 3-7 is located on the right side of the lower cover II 3-6, so as to be connected to the front fixed cavity 4-1 of the test clamping system 4 through the water supply pipe 11. The liquid inlet ball valve 3-1 is arranged at the water outlet II 3-7.

[0079] The water inlet 3-8 is connected to the circulation pump 2 through the water inlet pipe 12, so as to facilitate the test liquid in the liquid storage system 1 to be sent into the rectifying tank body 3-2.

[0080] Preferably, sealing rings II3-9 are provided between the upper cover II3-4 and the rectifying tank body 3-2, and between the lower cover II3-6 and the rectifying tank body 3-2, respectively, to ensure the sealing of the rectifying system 3.

[0081] like Figure 5-10 As shown, in order to facilitate the replacement of the test sample, the rear movable cavity 4-2 can move relative to the front fixed cavity 4-1 to match or separate the two.

[0082] Wherein, an accommodating cavity 4-5 is provided at the opposite ends of the front fixed cavity 4-1 and the rear movable cavity 4-2, and a valve carrier 14 for placing the test sample is placed in the accommodating cavity 4-5.

[0083] During testing, the front end fixed cavity 4-1 and the rear end movable cavity 4-2 are locked together; when replacing the test sample, the rear end movable cavity 4-2 is moved away from the front end fixed cavity 4-1 to separate the two. At this time, the valve carrier 14 can be taken out of the accommodating cavity 4-5 to replace the test sample.

[0084] The front end fixing cavity 4-1 is directly fixed to the front wall of the vertical plate 7-2 by means of screws and other connecting parts.

[0085] In order to realize the horizontal movement of the rear end moving cavity 4-2, a linear guide rail 4-6 is arranged on the rear side of the rear end moving cavity 4-2, and a slider 4-7 assembled on the linear guide rail 4-6 is arranged on the rear wall of the rear end moving cavity 4-2.

[0086] In this embodiment, two linear guides 4-6 are provided and arranged horizontally. The linear guides 4-6 are fixed to the front wall of the vertical plate 7-2 by screws. A fixed plate 4-8 is provided on the rear wall of the rear end moving cavity 4-2. The slider 4-7 is installed on the fixed plate 4-8 and cooperates with the corresponding linear guides 4-6. When the rear end moving cavity 4-2 is coordinated with the front end fixed cavity 4-1, the rear end moving cavity 4-2 is directly pushed to move on the linear guide 4-6.

[0087] In order to limit the movement of the rear end movable cavity 4-2, a limit stopper 4-9 is provided at one end of the linear guide rail 4-6 away from the front end fixed cavity 4-1.

[0088] In order to lock the rear movable cavity 4-2 with the front fixed cavity 4-1 and avoid the random movement of the rear movable cavity 4-2 during the test, the front fixed cavity 4-1 and the rear movable cavity 4-2 are connected by a lock 4-10.

[0089] In this embodiment, two locks 4 - 10 are provided, which are respectively located at the top and the bottom of the test clamping system 4 .

[0090] The lock buckle 4-10 includes a lock hook installed on the front fixed cavity 4-1, and a lock ring installed on the rear movable cavity 4-2. The lock ring can be locked on the lock hook and can also be detached from the lock hook.

[0091] In order to be able to test the gas exhaust in the clamping system 4, exhaust valves are respectively provided on the tops of the front fixed cavity 4-1 and the rear movable cavity 4-2.

[0092] Located at the top of the front fixed cavity 4-1 is the front exhaust valve 4-11, and located at the top of the rear movable cavity 4-2 is the rear exhaust valve 4-12.

[0093] The front-end pressure sensor 4-13 is located at the front side of the front-end fixed cavity 4-1, and the rear-end pressure sensor 4-14 is located at the front side of the rear-end movable cavity 4-2.

[0094] Among them, the water supply pipe 11 is connected to the water inlet 3-8 of the front fixed cavity 4-1 in a threaded manner, and the water outlet of the rear movable cavity 4-2 is set backward, which can be conveniently connected to the forward flow return pipe 5 located on the rear side of the vertical plate 7-2, and the rear end ball valve 4-3 is set at the water outlet of the rear end movable cavity 4-2.

[0095] The anti-leakage reflux pipe 6 is connected to the bottom of the rear end moving cavity 4-2, and the anti-leakage ball valve 4-4 is arranged at the connection between the two.

[0096] When the test sample is replaced, a water receiving box 13 is provided below the test clamping system 4 to facilitate the recovery of the test liquid.

[0097] The water receiving box 13 is directly placed on the bottom plate 7 - 1 of the base 7 and is located below the test clamping system 4 .

[0098] When testing the forward flow:

[0099] Place the forward flow standard nozzle that meets the requirements of the reference GB / T12279.1-2024 standard into the valve carrier 14, and install the valve carrier 14 into the test clamping system 4, and lock the lock 4-10. Before testing, close all ball valves and exhaust valves, add an appropriate amount of test liquid to the liquid storage system 1, set the test liquid temperature, turn on the heating system to heat the test liquid using the heating rod 1-9, open the rear end ball valve 4-3 and the liquid inlet ball valve 3-1, start the circulation pump 2, and the flow rate of the test liquid slowly increases. At this time, open each exhaust valve to discharge the gas in the test clamping system 4. After the temperature of the liquid to be tested is stabilized, the test flow rate is set according to the flow range (5L / min-30L / min) required by the standard, and increases in steps of 5L / min. The signal fed back by the forward flow flow sensor 8 is used to detect whether the flow rate reaches the set value. If the steady-state flow is not reached, the test system will control the circulation pump 23 to continue to adjust the flow rate to the set value, and detect the corresponding front and rear pressures under the current set flow rate through the front pressure sensor 4-13 and the rear pressure sensor 4-14 and calculate the pressure difference. Record all test flows and the corresponding front and rear pressures and pressure differences, draw and analyze the flow and pressure difference curves, complete the test, and stop the circulation pump 2.

[0100] During reverse leakage test:

[0101] Place the anti-leakage standard nozzle that meets the requirements of the reference GB / T12279.1-2024 standard into the valve carrier 14, then install the valve carrier 14 into the test clamping system 4, and lock the lock 4-10. Before testing, close all ball valves and exhaust valves, add an appropriate amount of test liquid to the liquid storage system 1, set the test liquid temperature, turn on the heating system to heat the test liquid using the heating rod 1-9, open the liquid inlet ball valve 3-1 and the anti-leakage ball valve 4-4, start the circulation pump 2, and the flow rate of the test liquid increases slowly. At this time, open each exhaust valve to discharge the gas in the test clamping system 4. After the temperature of the liquid to be tested is stabilized, the test differential pressure is set according to the pressure differential range (40mmHg-200mmHg) required by the standard, and increases in steps of 40mmHg. The front-end pressure sensor 4-13 and the rear-end pressure sensor 4-14 are used to detect whether the pressure differential reaches the set value. If it does not reach the steady-state flow test system, the circulation pump 2 will continue to adjust the flow rate to the set value, and the corresponding leakage flow rate under the current set pressure differential will be detected by the anti-leakage flow sensor 9. All test flows and the corresponding front and rear pressures and pressure differentials are recorded, and the flow and pressure differential curves are drawn and analyzed. After the test is completed, the circulation pump 2 is stopped.

[0102] The above is the test of the standard nozzle in the GB / T12279.1-2024 standard, which is used to compare and analyze with the standard curve to determine the stability of the test system. The detection method of the artificial heart valve is similar to that of the standard nozzle, that is, the test sample is replaced from the nozzle to the artificial heart valve.

[0103] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An artificial heart valve steady-state flow tester, characterized in that: It comprises a forward flow test loop formed by sequentially connecting a liquid storage system (1), a circulation pump (2), a rectification system (3), a test clamping system (4) and a forward flow return pipe (5), and an anti-leakage return pipe (6) connected between the test clamping system (4) and the liquid storage system (1); The test clamping system (4) comprises a front-end fixed cavity (4-1) and a rear-end movable cavity (4-2), and a valve carrier (14) installed at the connecting ends of the two, and pressure sensors are installed on the front-end fixed cavity (4-1) and the rear-end movable cavity (4-2) respectively; Flow sensors are respectively installed on the forward flow return pipe (5) and the reverse leakage return pipe (6).

2. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: A rear end ball valve (4-3) is installed between the rear end moving cavity (4-2) and the forward flow return pipe (5), an anti-leakage ball valve (4-4) is installed between the rear end moving cavity (4-2) and the anti-leakage return pipe (6), and a liquid inlet ball valve (3-1) is installed between the rectification system (3) and the forward flow return pipe (5).

3. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: The rectification system (3) and the test clamping system (4) are arranged side by side on the front side of a base (7), and the circulation pump (2) is arranged below the rectification system (3); The forward flow return pipe (5) is arranged transversely on the rear side of the base (7) and one end of it is connected to the liquid storage system (1) located on one side of the base (7); the anti-leakage return pipe (6) is arranged transversely below the rectification system (3) and the test clamping system (4) and one end of it is connected to the liquid storage system (1) and the other end is connected to the rear end movable cavity (4-2).

4. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: The liquid storage system (1) comprises a liquid storage tank body (1-1), an upper cover assembly I installed on the top of the liquid storage tank body (1-1), and a lower cover assembly I installed on the bottom of the liquid storage tank body (1-1); The upper cover assembly I comprises an upper cover I (1-3), and a forward flow return water port (1-4) and a reverse leakage return water port (1-5) arranged on the side of the upper cover I (1-3); a water injection port (1-6) closed by a plug (1-7) is arranged above the upper cover I (1-3); The lower cover assembly I comprises a lower cover I (1-8), and a heating rod (1-9), a temperature sensor (1-10) and a liquid level sensor (1-11) arranged in the lower cover I (1-8); a drain valve (1-12) and a water outlet I (1-13) are arranged on the side of the lower cover I (1-8).

5. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: The rectification system (3) comprises a rectification tank body (3-2), an upper cover assembly II installed on the top of the rectification tank body (3-2), and a lower cover assembly II installed on the bottom of the rectification tank body (3-2); The upper cover assembly II comprises an upper cover II (3-4) and a rectifying exhaust valve (3-5) arranged on the upper cover II (3-4); The lower cover assembly II comprises a lower cover II (3-6), a water outlet II (3-7) arranged on one side of the lower cover II (3-6), and a water inlet (3-8) at the bottom of the lower cover II (3-6).

6. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: The rear end movable cavity (4-2) can move relative to the front end fixed cavity (4-1) to match or separate the two.

7. The artificial heart valve steady-state flow testing machine according to claim 6, characterized in that: A linear guide rail (4-6) is arranged on the rear side of the rear end moving cavity (4-2), and a slider (4-7) assembled on the linear guide rail (4-6) is arranged on the rear wall of the rear end moving cavity (4-2); A limit stopper (4-9) is provided at one end of the linear guide rail (4-6) away from the front end fixed cavity (4-1).

8. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: The front fixed cavity (4-1) and the rear movable cavity (4-2) are connected via a lock (4-10).

9. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: Exhaust valves are respectively arranged on the tops of the front fixed cavity (4-1) and the rear movable cavity (4-2).

10. The artificial heart valve steady-state flow testing machine according to claim 1, characterized in that: A water receiving box (13) is arranged below the test clamping system (4).

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