High flow constant pressure liquid propellant pump

Abstract

The application provides a high-flow constant-pressure liquid propelling pump, and relates to the field of medical devices, which comprises a pipe body, a working piston arranged in the pipe body and separating the pipe body into a first working cavity and a second working cavity, a first injection end connected to the first working cavity and adapted to inject a first liquid into the first working cavity, a second injection end connected to the second working cavity and adapted to inject a second liquid into the second working cavity, the second liquid being a working liquid having a specific function in the human body, a third working cavity communicated with the second working cavity, and a constant-pressure resistance valve installed on the first working cavity of the pipe body and used for regulating the pressure difference between the first working cavity and the second working cavity, wherein the working piston is located between the constant-pressure resistance valve and the second working cavity and can be pushed to move towards the second working cavity along with the injection of the first liquid into the first working cavity. The application can not only prop the liquid to be injected into the lumen of the human body at a high flow rate, but also can keep the third working cavity at a pressure set in advance.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a high-flow-rate constant-pressure liquid propulsion pump. Background Technology

[0002] Currently, transcatheter aortic valve replacement (TAVR) is a popular and emerging treatment for patients with aortic stenosis. The procedure requires aortic balloon dilation. Compared to a standard coronary balloon, the aortic balloon has a larger capacity and requires rapid fluid injection. Currently, a standard 50ml medical syringe is used. While this syringe allows for quick and easy injection of fluid into the balloon, it cannot control or monitor the injection pressure. The balloon dilation pressure is a crucial clinical parameter, reflecting the degree of valve leaflet stiffness, and controlling the pressure can prevent excessive damage to the leaflets. While a standard coronary balloon infusion pump can control the pressure, its screw-in injection method is slow and cannot meet the rapid injection requirements of TAVR. An infusion pump (manufactured by Edwards) is available on the market that can rapidly inject fluid and monitor pressure, but it cannot provide constant pressure injection. Summary of the Invention

[0003] The purpose of this invention is to provide a high-flow-rate constant-pressure liquid propulsion pump to solve the above problems.

[0004] In a first aspect, embodiments of the present invention provide a high-flow-rate constant-pressure liquid propulsion pump, comprising:

[0005] tube body;

[0006] A working piston is disposed inside the tube, and divides the tube into a first working chamber and a second working chamber;

[0007] A first injection end connected to the first working chamber is adapted to inject a first liquid into the first working chamber;

[0008] The second injection end connected to the second working chamber is adapted to inject a second liquid into the second working chamber. The second liquid is a working liquid that has a specific function in the human body.

[0009] The third working chamber is connected to the second working chamber and is suitable for insertion into the human body so that the second liquid flowing into it from the second working chamber can play its role;

[0010] A constant pressure flow control valve is installed on the first working chamber of the pipe body to regulate the pressure difference between the first working chamber and the second working chamber;

[0011] The working piston is located between the constant pressure flow control valve and the second working chamber. As the first liquid is injected into the first working chamber, it can be pushed to move towards the second working chamber.

[0012] In some embodiments, the constant pressure flow control valve includes an upper cavity and a lower cavity separated by a flexible partition. The upper cavity communicates with the second working chamber, the lower cavity is sealed, and a flow control rod passes through the flexible partition. The flow control rod is inserted into the first working chamber. The flexible partition deforms and moves with the pressure change in the upper cavity. The flow control rod can move up and down under the deformation of the flexible partition to selectively cut off or connect the first liquid flowing between the first working chamber and the working piston.

[0013] In some embodiments, the rod body of the flow-blocking top rod is provided with a sealing ring.

[0014] In some embodiments, the sealing ring is a silicone ring.

[0015] In some embodiments, a spring is fitted onto the flow-blocking rod, and the flow-blocking rod is reset by means of the spring.

[0016] In some embodiments, the bottom of the first working chamber is provided with a flow-blocking seat that is in a tight fit with the flow-blocking top rod.

[0017] In some embodiments, the flow-blocking seat has a through hole for the first liquid to pass through.

[0018] In some embodiments, one end of the flow-blocking rod extending outside the upper cavity is connected to a pressure regulating mechanism, and the pressure regulating mechanism is disposed in the center of the flexible partition. The pressure regulating mechanism is adapted to adjust the initial distance between the flow-blocking rod and the flow-blocking seat.

[0019] In some embodiments, the high-flow constant-pressure liquid propulsion pump further includes a pressure gauge installed on the pipeline between the constant-pressure flow control valve and the second working chamber.

[0020] In some embodiments, the high-flow constant-pressure liquid propulsion pump further includes an exhaust valve connected to the first working chamber.

[0021] In some embodiments, the first liquid is a low-viscosity liquid. Specifically, the first liquid may be physiological saline, and the second liquid may be a contrast agent.

[0022] In some embodiments, the volume of the first working chamber is larger than the volume of the second working chamber.

[0023] In some embodiments, the volume of the first working cavity is greater than the sum of the volumes of the second working cavity and the third working cavity.

[0024] In some embodiments, both the first injection end and the second injection end are two-way valves.

[0025] In some embodiments, as the working piston moves toward the second working chamber, the third working chamber can expand as the pressure increases.

[0026] In some embodiments, the third working chamber is specifically a balloon that intervenes in the natural lumen of the human body.

[0027] Compared with the prior art, the technical solution of the present invention has at least the following advantages:

[0028] 1. Based on the existing third working chamber (generally a working balloon chamber) and the connected tubing used for intervention in human cavities, a working piston is used to divide the tubing into a first working chamber and a second working chamber, and the second working chamber and the third working chamber are connected. A constant pressure flow control valve is installed between the first working chamber and the working piston to regulate the pressure difference between the first working chamber and the second working chamber. Different liquids are injected into the first working chamber and the second working chamber (the former is a liquid suitable for driving the working piston, and the latter is a working liquid with specific functions in the human body). In this way, by injecting liquid into the first working chamber, the working piston is pushed towards the second working chamber, compressing the second and third working chambers, so that the liquid pressure in the second and third working chambers increases until the expected pressure value is reached. Then, the constant pressure flow control valve cuts off the first liquid between the first working chamber and the working piston, so that the liquid to be injected into the human cavity can be propelled at a high flow rate, and the third working chamber can be stably maintained at the pre-set pressure.

[0029] 2. By making the volume of the first working chamber larger than that of the second working chamber, or even larger than the sum of the volumes of the second and third working chambers, the capacity of the third working chamber is indirectly expanded. This makes the pressure increase rate more stable, thereby ensuring that the entire liquid propulsion pump system can more stably push the liquid to be injected into the human body's cavities.

[0030] 3. The first working chamber uses a low-viscosity liquid (such as ordinary physiological saline) suitable for driving the working piston, while the second and third working chambers use contrast agents or other special functional working fluids. This can save on the use of special working fluids, reduce costs, and avoid the problem of system malfunction caused by excessively high viscosity of special functional working fluids. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A cross-sectional view of a high-flow-rate constant-pressure liquid propulsion pump provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of the structure of a high-flow constant-pressure liquid propulsion pump at the first angle;

[0034] Figure 3 for Figure 2 A schematic diagram showing the change in the state of the flexible diaphragm in a high-flow-rate constant-pressure liquid propulsion pump;

[0035] Figure 4 for Figure 1 A schematic diagram of the constant pressure flow control valve of a high-flow constant pressure liquid propulsion pump;

[0036] Figure 5 for Figure 1 A schematic diagram of the flow-blocking push rod of a high-flow-rate constant-pressure liquid propulsion pump;

[0037] Figure 6 for Figure 1 A schematic diagram of the structure of a high-flow constant-pressure liquid propulsion pump where the flow-blocking push rod enters the flow-blocking seat;

[0038] Figure 7 for Figure 1 A schematic diagram of the flow-blocking seat of a high-flow-rate constant-pressure liquid propulsion pump;

[0039] Figure 8 This is a schematic diagram of the constant pressure flow control valve of a high flow rate constant pressure liquid propulsion pump according to an embodiment of the present invention;

[0040] Figure 9 for Figure 8 A schematic diagram of the flexible partition and nut in a constant pressure flow control valve. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Please refer to the reference. Figures 1 to 8 This embodiment provides a high-flow constant-pressure liquid propulsion pump, including a pipe body 11, a working piston 6, a constant-pressure flow control valve 4, a flow control seat 5, a pressure gauge 7, a first injection end 9, a second injection end 10, and an exhaust valve 12.

[0048] The working piston 6 is disposed inside the tube body 11, dividing the tube body 11 into a first working chamber 1 and a second working chamber 2. A first injection end 9 is connected to the first working chamber 1 and is adapted to inject a first liquid into the first working chamber 1. In this embodiment, the first liquid is a low-viscosity liquid (according to common knowledge in the art, a viscosity range between 1-5000 Cp (centipascals), such as water and lubricating oil, can be considered low-viscosity liquids), specifically physiological saline. A second injection end 10 is connected to the second working chamber 2 and is adapted to inject a second liquid into the second working chamber 2. The second liquid is a working fluid with specific functions acting on the human body; in actual implementation, it can be a contrast agent or other working fluid with specific functions. In specific implementation, both the first injection end 9 and the second injection end 10 can be in the form of a two-way valve. The constant pressure flow control valve 4 is installed on the first working chamber 1 of the tube body 11 and is used to regulate the pressure difference between the first working chamber 1 and the second working chamber 2.

[0049] The high-flow constant-pressure liquid propulsion pump also includes a third working chamber 3, which is connected to the second working chamber 2 and is suitable for insertion into the human body so that the second liquid flowing into the second working chamber 2 can play its role.

[0050] In this embodiment, the volume of the first working chamber 1 is larger than the volume of the second working chamber 2, and preferably larger than the sum of the volumes of the second working chamber 2 and the third working chamber 3. This allows the pressure increase rate to be more stable, thereby ensuring that the entire liquid propulsion pump system can more stably push the liquid to be injected into the human body cavity.

[0051] The working piston 6 is located between the constant pressure flow control valve 4 and the second working chamber 2. As the first liquid is injected into the first working chamber 1, it can be pushed to move towards the second working chamber 2.

[0052] In actual implementation, the first working chamber 1 is independent, sealed, and not connected to other working chambers. The second working chamber 2 and the third working chamber 3 can be connected through pipelines. When the working piston 6 moves towards the second working chamber 2, the third working chamber 3 can expand as the pressure increases. In this embodiment, the third working chamber 3 is specifically a balloon that intervenes in the natural lumen of the human body.

[0053] The ultimate goal of this invention is to stably maintain the third working chamber 3 at a pre-set pressure.

[0054] The first injection end 9 is connected to the first working chamber 1 via a conduit. The second injection end 10 is connected to the second working chamber 2 via a conduit.

[0055] A constant pressure flow control valve 4 is installed on the first working chamber 1 of the pipe body 11. The working piston 6 is located between the constant pressure flow control valve 4 and the third working chamber 3. The constant pressure flow control valve 4 is connected to the second working chamber 2 via a pipeline, and a pressure gauge 7 is installed on the pipeline between the constant pressure flow control valve 4 and the second working chamber 2.

[0056] The working principle of the high-flow-rate constant-pressure liquid propulsion pump provided in this embodiment is as follows:

[0057] In this embodiment, physiological saline (the specific implementation of the first liquid) is injected into the first working chamber 1 through the first injection end 9, filling the first working chamber 1 with physiological saline (gas in the first working chamber 1 is discharged through the exhaust valve 12). The second working chamber 2 and the third working chamber 3 are filled with contrast agent or working fluid for balloon dilation through the second injection end 10. By injecting physiological saline into the first injection end 9, the pressure in the first working chamber 1 continuously increases, pushing the working piston 6 to move distally (i.e., towards the second working chamber 2), compressing the second working chamber 2 and the third working chamber 3, thus increasing the liquid pressure in the second working chamber 2 and the third working chamber 3. Since the second working chamber 2 and the third working chamber 3 are connected, the liquid pressure in the two chambers is always equal. The liquid in the second working chamber 2 flows back into the constant pressure flow control valve 4 through the pipeline. The flow control rod 44 of the constant pressure flow control valve 4 is inserted into the first working chamber 1. The rod body of the flow control rod 44 is equipped with a sealing device such as a silicone ring, so that the constant pressure flow control valve 4 and the first working chamber 1 are isolated from each other, and the liquids do not communicate.

[0058] You can refer to this. Figure 1 , 2 In sections 3 and 8, the constant pressure flow control valve 4 is divided into two chambers by a flexible partition 43: an upper chamber 45a and a lower chamber 45b. The upper chamber 45a is connected to the second working chamber 2, while the lower chamber 45b is sealed to prevent liquid from entering and contains a spring 42. When the pressure in the upper chamber 45a increases, the flexible partition 43 is squeezed into the lower chamber 45b, causing deformation. The upper chamber 45a expands, and the lower chamber 45b shrinks, compressing the spring 42. The flow control rod 44 moves downward under the deformation of the flexible partition 43. As the pressure continues to increase, the flow control rod 44 enters the flow control seat 5, cutting off the first liquid between the first working chamber 1 and the working piston 6, preventing further injection of the first liquid.

[0059] If leakage occurs in the second working chamber 2 and the third working chamber 3, the pressure decreases, the spring 42 will rebound, the flow-blocking rod 44 will lift, and the first liquid in the first working chamber 1 will replenish the second working chamber 2 until the flow-blocking rod 44 enters the flow-blocking seat 5. This forms a stable liquid filling method that maintains pressure.

[0060] In this embodiment, the end of the flow-blocking rod 44 extending beyond the upper cavity 45a is connected to a pressure regulating mechanism 41, which is suitable for adjusting the initial distance between the flow-blocking rod 44 and the flow-blocking seat 5. Specifically, it may include an adjusting operation end 41a and a nut 41b. The nut 41b in the pressure regulating mechanism 41 is located in the center of the flexible partition 43.

[0061] In actual implementation, pressure gauge 7 can read the pressure value of the second working chamber 2, while pressure regulating mechanism 41 can adjust the initial distance between flow-blocking rod 44 and flow-blocking seat 5, thereby setting different flow-blocking pressure values.

[0062] In this embodiment, it should be particularly noted that:

[0063] Firstly, the first working chamber 1 uses a low-viscosity liquid (such as ordinary saline) suitable for driving the working piston, while the second working chamber 2 and the third working chamber 3 use contrast agents or other special-function working fluids. This can save on the use of special working fluids, reduce costs, and avoid the problem of system malfunction caused by excessively high viscosity of special-function working fluids.

[0064] Specifically, ordinary saline solution is characterized by low viscosity, low cost, safety, and easy availability. Its low viscosity is more conducive to the operation of the working piston. However, if contrast agents or other special functional working fluids are injected directly into the third working chamber 3, the cost of these special functional working fluids is relatively high, and large-volume use is not recommended for safety and practicality reasons. However, small-volume injections can cause pressure instability (see subsequent analysis for details). In addition, some special functional working fluids have high viscosity, which is not conducive to injection even in large volumes.

[0065] Secondly, by making the volume of the first working chamber larger than that of the second working chamber, or even larger than the sum of the volumes of the second and third working chambers, the capacity of the third working chamber is indirectly expanded. This allows the pressure increase rate to be more stable, thereby ensuring that the entire liquid propulsion pump system can more stably push the liquid to be injected into the human body's cavities.

[0066] As mentioned earlier, because the volume of contrast agents and other specialized fluids used clinically is very small, the injection pressure cannot be stabilized. For example, in a very small working chamber, even injecting a small amount of fluid results in a large volume change, making it difficult to maintain a stable pressure. However, using a large-volume working chamber would require a large volume of contrast agent or specialized working fluid, which is wasteful and potentially unsafe for the patient. Therefore, by using two different types of fluids in combination—using ordinary saline solution to indirectly expand the volume of the first working chamber—and ensuring that the two fluids are isolated and do not mix, stable pressure injection can be achieved without increasing the dosage of contrast agent or other specialized working fluids, saving costs and improving injection safety.

[0067] The principle of capacity expansion will be explained below:

[0068] The volume of the first working chamber 1 is larger than that of the second working chamber 2, and even larger than the combined volume of the second and third working chambers 3. The larger the volume of the first working chamber 1, the smaller the increase in volume relative to the original total volume when using a syringe to propel the liquid. Therefore, the propulsion is smoother, the pressure is better maintained, the rate of pressure increase is more stable, and the entire liquid propulsion pump system is more stable. This is because the rate of pressure increase is related to the original volume of liquid. For example, assuming the original liquid in the first working chamber is 500ml, when using a 10ml syringe to propel it, the pressure increase will be much smoother than when the original liquid in the first working chamber 1 is 50ml. Injecting 10ml into 500ml increases the overall liquid volume by 10 / 500, a very small increase. However, if the original volume is 50ml, the pressure will increase by 10 / 50, a large and rapid increase. That is, the larger the increase percentage, the worse the accuracy of the increase; even a small injection will cause a rapid increase in pressure, making it impossible to maintain a stable pressure. Therefore, expanding the volume using the first working chamber 1, besides saving contrast agent or special working fluids, also has the function of stable propulsion.

[0069] Combining these two points not only saves on special working fluids such as contrast agents but also avoids system malfunctions caused by excessively high viscosity of these fluids, and more stably propels the fluid to be injected into the body's cavities. Furthermore, by incorporating a constant-pressure flow control valve, it can effectively stop the flow once the pressure value is reached.

[0070] To explain the device more clearly, the working principle of the constant pressure flow control valve 4 will be further explained in detail.

[0071] Continue reading Figure 1 , 8The constant pressure flow control valve 4 has a cavity divided into an upper cavity 45a and a lower cavity 45b. The upper cavity 45a is connected to the returning second liquid, while the lower cavity 45b is sealed and does not allow liquid to enter. A spring 42 is located in the lower cavity. The component that isolates the upper cavity 45a and the lower cavity 45b is called a flexible partition 43. Because the flexible partition 43 is flexible, it can be concave or convex. When it is concave, it indicates that the pressure value of the upper cavity 45a increases; when it is convex, it indicates that the pressure value of the upper cavity 45a decreases. A nut 41b is fixedly installed in the center of the flexible partition 43, and the flow control rod 44 is threadedly connected to the nut 41b. The flow control rod 44 and the pressure regulating mechanism 41 are fixedly connected (specifically, by welding or integral molding). Rotating the adjusting operation end 41a of the pressure regulating mechanism 41 adjusts the distance between the flow control rod 44 and the flow control seat 5. Meanwhile, since the flow-blocking rod 44 and the flexible partition 43 are connected together by the nut 41b, when the flexible partition 43 deforms, it will drive the flow-blocking rod 44 to move. The end of the flow-blocking rod 44 and the recess of the flow-blocking seat 5 have only a very small gap fit. When the flow-blocking rod 44 enters the flow-blocking seat 5, it blocks the flow of the first liquid from the first working chamber 1 to the second working chamber 2. The greater the pressure in the first working chamber 1, the tighter the flow-blocking rod 44 and the flow-blocking seat 5 will be pressed together by the pressure, and the more difficult it is for the first liquid to pass through.

[0072] Combination Figure 6 and Figure 7 The function of the flow-blocking seat 5 and the flow-blocking rod 44 is to control the connection between the first working chamber 1 and the second working chamber 2. This can be achieved by inserting the flow-blocking rod 44 into the flow-blocking seat 5, which is a mechanism to block the liquid.

[0073] The following is a design of the flow-blocking seat 5. The flow-blocking seat 5 has a square hole 51 in the center, through which the first liquid can pass. When the flow-blocking push rod 44 moves downward, it blocks the flow of the first liquid through the central square hole 51.

[0074] Gear adjustment instructions:

[0075] This constant pressure flow control valve device can be pre-set with multiple positions. A suitable spring 42 is selected. The positions are designed based on the stroke of the flow control rod 44, and these positions can be marked on the exposed part of the pressure regulating mechanism 41. Since the pressure of the spring 42 is proportional to its stroke, the scale markings will have a very close linear relationship, making them easy to set and stable.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-flow-rate constant-pressure liquid propulsion pump, characterized in that, include: tube body; A working piston is disposed inside the tube, and divides the tube into a first working chamber and a second working chamber; A first injection end connected to the first working chamber is adapted to inject a first liquid into the first working chamber; The second injection end connected to the second working chamber is adapted to inject a second liquid into the second working chamber. The second liquid is a working liquid that has a specific function in the human body. The third working chamber is connected to the second working chamber and is suitable for insertion into the human body so that the second liquid flowing into it from the second working chamber can play its role; A constant pressure flow control valve is installed on the first working chamber of the pipe body to regulate the pressure difference between the first working chamber and the second working chamber. The constant pressure flow control valve includes an upper chamber and a lower chamber separated by a flexible partition. The upper chamber is connected to the second working chamber, and the lower chamber is sealed. A flow control rod is inserted into the first working chamber through the flexible partition. The flexible partition deforms and moves with the pressure change in the upper chamber. The flow control rod can move up and down under the deformation of the flexible partition to selectively cut off or open the flow of the first liquid between the first working chamber and the working piston. The working piston is located between the constant pressure flow control valve and the second working chamber. As the first liquid is injected into the first working chamber, it can be pushed to move towards the second working chamber.

2. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, The flow-blocking top rod is equipped with a sealing ring.

3. The high-flow-rate constant-pressure liquid propulsion pump according to claim 2, characterized in that, The sealing ring is a silicone ring.

4. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, A spring is fitted onto the flow-blocking rod, and the flow-blocking rod is reset by means of the spring.

5. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, The bottom of the first working chamber is provided with a flow-blocking seat that is in a tight fit with the flow-blocking top rod.

6. The high-flow-rate constant-pressure liquid propulsion pump according to claim 5, characterized in that, The flow-blocking seat has a through hole for the first liquid to pass through.

7. The high-flow-rate constant-pressure liquid propulsion pump according to claim 5, characterized in that, One end of the flow-blocking rod extending outside the upper cavity is connected to a pressure regulating mechanism, and the pressure regulating mechanism is located in the center of the flexible partition. The pressure regulating mechanism is adapted to adjust the initial distance between the flow-blocking rod and the flow-blocking seat.

8. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, It also includes a pressure gauge installed on the pipeline between the constant pressure flow control valve and the second working chamber.

9. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, It also includes an exhaust valve connected to the first working chamber.

10. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, The first liquid is a low-viscosity liquid.

11. The high-flow-rate constant-pressure liquid propulsion pump according to claim 10, characterized in that, The first liquid is physiological saline, and the second liquid is a contrast agent.

12. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, The volume of the first working chamber is larger than the volume of the second working chamber.

13. The high-flow-rate constant-pressure liquid propulsion pump according to claim 12, characterized in that, The volume of the first working chamber is greater than the sum of the volumes of the second working chamber and the third working chamber.

14. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, Both the first injection end and the second injection end are two-way valves.

15. The high-flow-rate constant-pressure liquid propulsion pump according to claim 1, characterized in that, As the working piston moves toward the second working chamber, the third working chamber expands as the pressure increases.

16. The high-flow-rate constant-pressure liquid propulsion pump according to claim 15, characterized in that, The third working chamber is a balloon that intervenes in the body's natural cavities.

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