Three-way valve and cryoablation device

Abstract

The present invention relates to the technical field of cryogenic valves, and specifically to a three-way valve and a cryoablation device. A three-way valve comprises a valve body, a liquid inlet and a liquid return port are provided on the valve body, the liquid inlet is plugged with an external liquid inlet pipe for connecting to a refrigeration main unit, the liquid return port is plugged with an external liquid return pipe for connecting to a refrigeration main unit, the liquid inlet and the liquid return port are located on the same side of the valve body, and the external liquid inlet pipe and the external liquid return pipe can be placed side by side in a vacuum pipe. The liquid inlet and the liquid return port are located on the same side of the valve body, which facilitates the external liquid inlet pipe and the external liquid return pipe to be placed side by side in a vacuum pipe for heat insulation treatment, reduces heat leakage to a certain extent, and facilitates rapid cooling of terminal equipment. The liquid inlet and the liquid return port are located on the same side of the valve body, and while the external liquid inlet pipe and the external liquid return pipe are heat insulated, the size of the valve body can be made very small, so that less liquid is retained in the valve body, which minimizes the heat leakage of the fluid and reduces unnecessary cold loss.

Description

Technical Field

[0001] The present invention relates to the technical field of cryovalves, and in particular to a three-way valve and a cryoablation device. Background Art

[0002] Cryogenic technology is widely used in various fields, such as refrigerators, cold chain logistics, and medical equipment. It generally includes a cooling device such as a compressor, which is combined with a cooling medium circulation system to transfer the cooling energy to the object being cooled. With the development of technology, many fields have put forward higher requirements for the cooling energy utilization rate, quietness, volume and other parameters of refrigeration equipment.

[0003] For example, in the field of medical devices, there is a cryoablation device. The cryoablation device generally includes a host and a cryoballoon. The host cryoballoon provides a cold medium. When in use, the cryoballoon is installed at the front end of the catheter and inserted into the human body. The host passes the cold medium from the catheter into the cryoballoon to cool it down, and then cryoablates the target tissue. Since the temperature requirement for cryoablation is generally around -60°C, and considering the loss of cold in the process, the temperature of the cold medium must reach at least -100°C to successfully perform cryoablation.

[0004] In a Chinese invention patent with authorization announcement number CN209301296U, a cryoablation device is disclosed, including a cryoballoon, a catheter, a medium storage tank, a medium supply pipeline, a medium recovery pipeline and a refrigeration assembly, wherein the pipelines are connected by an existing three-way valve to transport the cold medium.

[0005] However, the existing three-way valves have the following technical defects: the existing three-way valves are all one-inlet and two-outlet or two-inlet and one-outlet types, and the inlet and outlet are not on the same side end surface. At this time, the inlet connecting pipe and the outlet connecting pipe cannot be close together. This structure is not conducive to the insulation treatment of the inlet connecting pipe and the outlet connecting pipe as a whole, which causes unnecessary cooling loss to a certain extent. Summary of the invention

[0006] The object of the present invention is to provide a three-way valve to solve the technical problem in the prior art that the connecting pipeline of the three-way valve is not convenient to be integrally insulated.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a three-way valve, including a valve body, on which a liquid inlet and a liquid return port are provided, the liquid inlet is plugged with an external liquid inlet pipe for connecting to a refrigeration main unit, the liquid return port is plugged with an external liquid return pipe for connecting to a refrigeration main unit, the liquid inlet and the liquid return port are located on the same side of the valve body, and the external liquid inlet pipe and the external liquid return pipe can be placed side by side in a vacuum pipe.

[0008] Furthermore, the external liquid inlet pipe and the external liquid return pipe are both parallel to the axial direction of the valve body.

[0009] Furthermore, a first cavity is opened in the valve body, an internal liquid inlet pipe is connected between the liquid inlet and the first cavity, an internal liquid return pipe is connected between the liquid return port and the first cavity, and a first circulation pipeline for cooling the valve body is arranged in the valve body, and the first circulation pipeline includes the internal liquid inlet pipe, the first cavity and the internal liquid return pipe.

[0010] Furthermore, a liquid outlet is provided on the end of the valve body away from the liquid inlet, an internal liquid outlet pipe connecting the first cavity and the liquid outlet is arranged in the valve body, and an external liquid pipe for connecting the terminal device is plugged into the liquid outlet; a one-way liquid flow port is provided on the end of the valve body away from the liquid inlet, and an external one-way liquid flow pipe for connecting the terminal device is plugged into the one-way liquid flow port; an internal one-way liquid flow pipe connecting the one-way liquid flow port and the liquid return port is arranged in the valve body; a second circulation pipeline for cooling the terminal device is arranged in the valve body, and the second circulation pipeline includes the internal liquid outlet pipe, the external liquid pipe, the external one-way liquid flow pipe and the internal one-way liquid flow pipe.

[0011] Furthermore, a second connecting pipe is connected between the inner one-way liquid flow pipe and the inner liquid return pipe, and a one-way valve for controlling liquid to flow from the one-way liquid flow port to the liquid return port is also arranged in the inner one-way liquid flow pipe.

[0012] Furthermore, a mounting cavity for accommodating the one-way valve is provided in the valve body, the mounting cavity is respectively connected with the one-way liquid flow port and the inner one-way liquid flow tube, and the one-way valve includes a block that can slidably block the one-way liquid flow port.

[0013] Furthermore, the one-way valve also includes an elastic part, the block includes a sealing head and a connecting rod arranged on the side of the sealing head away from the one-way liquid flow port, the elastic part is sleeved on the connecting rod, and one end of the elastic part abuts against the sealing head, and the other end abuts against the inner wall of the installation cavity.

[0014] Furthermore, the elastic member is configured as a conical spring.

[0015] Furthermore, a second cavity is opened in the valve body, the first cavity is connected with the second cavity through a set connecting channel, the second cavity is connected with the inner liquid outlet pipe through a set first connecting pipe, and the three-way valve also includes a switching slider for switching from the first circulation pipeline to the second circulation pipeline, the switching slider is arranged in the first cavity, and the switching slider can block the end of the inner liquid return pipe close to the first cavity or the connecting channel.

[0016] Furthermore, a driving member for controlling the movement of the switching slider is installed in the second cavity.

[0017] Furthermore, the driving member is a solenoid valve, the solenoid valve is located inside the valve body, and one end of the piston rod of the solenoid valve is fixedly connected to the switching slider.

[0018] Furthermore, a cover plate for reinforcing the driving member is provided at one end of the driving member close to the outer side of the valve body.

[0019] Furthermore, the valve body is made of low-temperature resistant material.

[0020] Furthermore, the present invention also provides a cryoablation device, comprising a refrigeration main unit, a three-way valve as described above, and a terminal device connected in sequence, wherein the three-way valve is placed in a vacuum box, and the external liquid inlet pipe and the external liquid return pipe can be placed side by side in a vacuum pipe.

[0021] The beneficial effects of the present invention are:

[0022] 1. The liquid inlet and liquid return port are located on the same side of the valve body, which facilitates the external liquid inlet pipe and the external liquid return pipe to be placed side by side in the vacuum pipe for insulation treatment, which reduces heat leakage to a certain extent and facilitates rapid cooling of the terminal equipment. The liquid inlet and liquid return port are located on the same side of the valve body. While the external liquid inlet pipe and the external liquid return pipe are insulated, the valve body size can be made very small. The small size of the valve body makes less liquid retained in the valve body, which minimizes the heat leakage of the fluid, reduces unnecessary cooling loss, and facilitates rapid cooling of the terminal equipment.

[0023] 2. The external liquid inlet pipe and the external liquid return pipe are arranged parallel to the valve body axis, which makes it easier to bring the external liquid inlet pipe and the external liquid return pipe together. After the pipe is brought together, the overall volume is smaller, which makes it easier to make the vacuum pipe smaller and save materials.

[0024] 3. Since there will be residual fluid in the valve body, when the terminal device needs to be used, the fluid retained in the valve body will flow into the terminal device first, but the temperature of the fluid retained in the valve body is relatively high. When the high temperature fluid flows through the terminal device, the cooling effect is poor. It is necessary to wait for several minutes for the subsequent low temperature fluid to flow through before the terminal device can be slowly cooled. Through the setting of the first circulation pipeline, the fluid remains in a flowing state, so that the fluid maintains a relatively low temperature as a whole, which facilitates the rapid cooling of the terminal device when the terminal device needs to be used.

[0025] 4. By setting up a second circulation pipeline, the fluid in the valve body can flow into the terminal device, so that the fluid can continuously cool the terminal device.

[0026] 5. The one-way valve is set to facilitate the isolation of the first circulation pipeline and the second circulation pipeline, so that they can work independently and avoid mutual interference.

[0027] 6. By setting the installation cavity, it is convenient for the block to block the one-way liquid flow port, so that the liquid can only flow from the one-way liquid flow port, the inner one-way liquid flow pipe, the second connecting pipe and the inner liquid return pipe to the liquid return port.

[0028] 7. The one-way valve includes an elastic member and a block. The elastic member squeezes the block so that the block blocks the one-way liquid flow port. When the fluid flows through the internal circulation pipeline, the fluid will flow through the elastic member and the block, and then impact the one-way liquid flow port. At this time, under the action of the fluid pressure, the block and the one-way liquid flow port fit more closely, preventing the fluid from flowing out from the external one-way liquid flow pipe, so that the fluid can only flow out from the external return liquid pipe.

[0029] 8. The conical spring better ensures the concentricity of the block, which facilitates better sealing and opening of the block. At the same time, the conical spring is small in size and has a large compressible space, which is suitable for installation in small spaces.

[0030] 9. By adjusting the switching slider, the valve body switches from the first circulation pipeline to the second circulation pipeline. Since the previous fluid has always maintained the state of the first circulation pipeline, the temperature is lower and the temperature of the fluid retained in the valve body is also lower. After switching to the state of the second circulation pipeline, the fluid with lower temperature flows through the terminal device, which can quickly cool down the terminal device.

[0031] 10. By setting a driving member, the movement of the switching slider can be controlled so that the switching slider abuts against the liquid return port or the liquid outlet, thereby completing the switching between the first circulation pipeline and the second circulation pipeline.

[0032] 11. The driving part adopts a solenoid valve. After the solenoid valve is energized, the piston rod end of the solenoid valve can move and then drive the movement of the switching slider to realize the switching of the first circulation pipeline and the second circulation pipeline.

[0033] 12. By setting the cover plate, the connection of the driving part is strengthened, so that the connection of the driving part in the valve body is more stable, preventing the driving part from deviating and affecting the accuracy, resulting in a weakened blocking effect of the switching slider.

[0034] 13. The valve body is made of low-temperature resistant material, which makes it easy to place the valve body in a low-temperature box for insulation treatment. The temperature in the low-temperature box is low, and the valve body is made of low-temperature resistant material, so it is not easy to cause damage to the valve body in a low-temperature environment.

[0035] 14. The three-way valve is located in the vacuum box, and the external liquid inlet pipe and the external liquid return pipe are placed side by side in the vacuum pipe, which minimizes the heat leakage of the fluid. The cryoablation device uses the above three-way valve to quickly cool the terminal device and reduce energy loss to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the principle structure of a first circulation pipeline used by a two-position three-way valve provided in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the principle structure of a second circulation pipeline used by a two-position three-way valve provided in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the three-dimensional structure of a two-position three-way valve provided in an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of a three-dimensional structure of a two-position three-way valve from another perspective provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of an axial cross-sectional structure of a two-position three-way valve provided in an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of an axial cross-sectional structure from another perspective of a two-position three-way valve provided in an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Valve body; 11. Liquid inlet; 111. Internal liquid inlet pipe; 12. Liquid return port; 121. Internal liquid return pipe; 13. Liquid outlet; 131. Internal liquid outlet pipe; 14. Switching slider; 141. Sealing pad; 15. First cavity; 151. Connecting channel; 16. Second cavity; 17. First connecting pipe; 2. External liquid inlet pipe; 3. External liquid return pipe; 4. External liquid pipe; 5. One-way liquid flow port; 51. External one-way liquid flow pipe; 52. One-way valve; 521. Elastic member; 522. Block; 5221. Connecting rod; 5222. Blocking head; 53. Installation cavity; 54. Internal one-way liquid flow pipe; 55. Second connecting pipe; 6. Driving member; 61. Solenoid valve; 7. Cover plate; 8. Refrigeration host; 9. Terminal equipment. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Example 1

[0050] Reference Figure 1 and Figure 3 A three-way valve provided as an embodiment of the present invention includes a valve body 1, a liquid inlet 11 and a liquid return port 12 are provided on the valve body 1, an external liquid inlet pipe 2 is plugged into the liquid inlet 11, and an external liquid return pipe 3 is plugged into the liquid return port 12, the liquid inlet 11 and the liquid return port 12 are located on the same side of the valve body 1, the external liquid inlet pipe 2 and the external liquid return pipe 3 are both parallel to the axial direction of the valve body 1, one end of the external liquid inlet pipe 2 and the external liquid return pipe 3 are connected to a refrigeration host 8, and the external liquid inlet pipe 2 and the external liquid return pipe 3 can be placed side by side in a vacuum pipe (not shown).

[0051] The liquid inlet 11 and the liquid return port 12 are located on the same side of the valve body 1, the liquid inlet 11 and the liquid return port 12 are adjacent, and the external liquid inlet pipe 2 and the external liquid return pipe 3 are arranged parallel to the valve body 1 axially, so that the external liquid inlet pipe 2 and the external liquid return pipe 3 are placed side by side in the vacuum pipe for insulation treatment, which reduces the heat leakage to a certain extent and facilitates the rapid cooling of the terminal device 9. The liquid inlet 11 and the liquid return port 12 are located on the same side of the valve body 1. While the external liquid inlet pipe 2 and the external liquid return pipe 3 are insulated, the size of the valve body 1 can be made very small. The small size of the valve body 1 makes less liquid retained in the valve body 1, which minimizes the heat leakage of the fluid, reduces unnecessary cold loss, and facilitates the rapid cooling of the terminal device 9.

[0052] Reference Figure 1 and Figure 3 Specifically, the valve body 1 is configured to be cylindrical, and a first cavity 15 is provided inside the valve body 1 to facilitate the flow of liquid. An inner liquid inlet pipe 111 is connected between the liquid inlet 11 and the first cavity 15, and an inner liquid return pipe 121 is connected between the liquid return port 12 and the first cavity 15. The inner liquid inlet pipe 111, the first cavity 15 and the inner liquid return pipe 121 form a first circulation pipeline that can cool the valve body 1. The fluid is retained from the refrigeration host 8, flows through the outer liquid inlet pipe 2, the liquid inlet 11, the inner liquid inlet pipe 111, the first cavity 15, the inner liquid return pipe 121, the liquid return port 12 and the outer liquid return pipe 3, and then flows back to the refrigeration host 8 to complete the circulation of the fluid.

[0053] Since there will be residual fluid in the valve body 1, when the terminal device 9 needs to be used, the fluid retained in the valve body 1 will first flow into the terminal device 9, but the temperature of the fluid retained in the valve body 1 is relatively high. When the relatively high temperature fluid flows through the terminal device 9, the cooling effect is relatively poor, and it is necessary to wait for several minutes for the subsequent low temperature fluid to flow through before the terminal device 9 can be slowly cooled. By setting the first circulation pipeline, the fluid remains in a flowing state, so that the fluid maintains a relatively low temperature as a whole, which facilitates the rapid cooling of the terminal device 9 when the terminal device 9 needs to be used.

[0054] Reference Figure 2 Furthermore, a three-way valve provided by the present invention also includes a second circulation pipeline. By setting the second circulation pipeline, the fluid in the valve body 1 can flow into the terminal device 9, so that the fluid can continuously cool the terminal device 9.

[0055] Reference Figure 2 and Figure 4Specifically, a liquid outlet 13 is provided on the end of the valve body 1 away from the liquid inlet 11, an inner liquid outlet pipe 131 connecting the first cavity 15 and the liquid outlet 13 is provided in the valve body 1, and an outer liquid outlet pipe 4 for connecting the terminal device 9 is plugged into the liquid outlet 13, and a one-way liquid flow port 5 is provided on the end of the valve body 1 away from the liquid inlet 11, and the one-way liquid flow port 5 is adjacent to the liquid outlet 13. An outer one-way liquid flow pipe 51 for connecting the terminal device 9 is plugged into the one-way liquid flow port 5, and an inner one-way liquid flow pipe 54 connecting the one-way liquid flow port 5 and the liquid return port 12 is provided in the valve body 1, and a second connecting pipe 55 is connected between the inner one-way liquid flow pipe 54 and the inner liquid return pipe 121, and the inner liquid outlet pipe 131, the outer liquid outlet pipe 4, the outer one-way liquid flow pipe 51 and the inner one-way liquid flow pipe 54 form a second circulation pipeline that can cool the terminal device 9. The fluid is retained from the refrigeration main unit 8, flows through the external liquid inlet pipe 2, the liquid inlet port 11, the internal liquid inlet pipe 111, the first cavity 15, the internal liquid outlet pipe 131, the liquid outlet port 13, the terminal device 9, the external one-way liquid flow pipe 51, the internal one-way liquid flow pipe 54, the second connecting pipe 55, the internal liquid return pipe 121, the liquid return port 12 and the external liquid return pipe 3, and then flows back to the refrigeration main unit 8 to complete the circulation of the fluid.

[0056] Reference Figure 2 and Figure 6 Furthermore, a one-way valve 52 is provided in the inner one-way liquid flow pipe 54 to control the liquid to flow from the one-way liquid flow port 5 to the return liquid port 12. The one-way valve 52 is provided to facilitate the isolation of the first circulation pipeline and the second circulation pipeline, so that they can work independently and avoid mutual interference.

[0057] Reference Figure 6Specifically, a mounting cavity 53 for accommodating a one-way valve 52 is provided in the valve body 1. The mounting cavity 53 is respectively connected to the one-way liquid flow port 5 and the inner one-way liquid flow tube 54. The one-way valve 52 includes an elastic member 521 and a stopper 522. The stopper 522 is located in the mounting cavity 53. One end of the elastic member 521 abuts against the side wall of the mounting cavity 53, and the other end abuts against the stopper 522. The end of the stopper 522 away from the elastic member 521 blocks the one-way liquid flow port 5. In this embodiment, the elastic member 521 is configured as a conical spring, which better ensures the concentricity of the stopper 522 and facilitates better sealing and opening of the stopper 522. At the same time, the conical spring has a small volume and a large compressible space, and is suitable for the case where the installation space is small. The stopper 522 includes a connecting rod 5221 and a plugging head 5222. The elastic member 521 is sleeved on the outer side of the connecting rod 5221, and one end of the plugging head 5222 abuts against the plugging head 5222. The end of the plugging head 5222 away from the elastic member 521 blocks the one-way liquid flow port 5. When a fluid flows from the return liquid port 12 to the one-way liquid flow port 5, the plugging head 5222 always blocks the one-way liquid flow port 5. At this time, the fluid cannot pass through and is blocked by the plugging head 5222, and can only flow to the return liquid port 12. When the fluid flows from the one-way liquid flow port 5 to the return liquid port 12, the fluid abuts against the plugging head 5222. Under the pressure of the fluid, the plugging head 5222 is squeezed to produce a certain displacement. At this time, the plugging head 5222 has no blocking effect, and the fluid can flow from the one-way liquid flow port 5 to the return liquid port 12.

[0058] The elastic member 521 may also be a cylindrical spring, and the stopper 522 may not be provided with a connecting rod 5221. In this case, a mounting groove may be provided on a side of the sealing head 5222 close to the elastic member 521, and one end of the elastic member 521 is located in the mounting groove.

[0059] Reference Figure 2 , Figure 5 and Figure 6 Furthermore, a second cavity 16 is provided in the valve body 1, the first cavity 15 is connected to the second cavity 16 through a connection channel 151, the second cavity 16 is connected to the inner liquid outlet pipe 131 through a first connection pipe 17, and the three-way valve further includes a switching slider 14 for switching from the first circulation pipeline to the second circulation pipeline, the switching slider 14 is provided in the first cavity 15, and the switching slider 14 can block the end of the inner liquid return pipe 121 close to the first cavity 15 or the connection channel 151. By adjusting the switching slider 14, the valve body 1 is switched from the first circulation pipeline to the second circulation pipeline. Since the previous fluid has been in the state of the first circulation pipeline, the temperature is relatively low, and the temperature of the fluid retained in the valve body 1 is also relatively low. At this time, after switching to the state of the second circulation pipeline, the fluid with a relatively low temperature flows through the terminal device 9, which can quickly cool the terminal device 9.

[0060] Reference Figure 5 and Figure 6Specifically, the surface of the switching slider 14 is coated with a rubber cushion, which has a good blocking effect, and is convenient for the switching slider 14 to block the return liquid pipe 121 or the connecting channel 151. A driving member 6 for controlling the movement of the switching slider 14 is installed in the second cavity 16. In this embodiment, the driving member 6 adopts a solenoid valve 61, and the solenoid valve 61 is located inside the valve body 1. One end of the piston rod of the solenoid valve 61 is fixedly connected to the switching slider 14. When the solenoid valve 61 is energized, the piston rod of the solenoid valve 61 moves to drive the switching slider 14 to move, so that the switching slider 14 abuts against and blocks the liquid outlet 13 or the return liquid port 12. When the switching slider 14 completes the abutment and blocking, the switching slider 14 is squeezed and fixed under the pressure of the fluid, thereby ensuring the switching between the first circulation pipeline and the second circulation pipeline.

[0061] The driving member 6 can also adopt a stepper motor, and the start of the stepper motor can drive the movement of the switching slider 14, so that the switching slider 14 abuts against and blocks the liquid inlet 11 or the liquid return port 12. The driving member 6 can also adopt a manual knob, by setting a manual knob and a screw rod, the rotation of the knob drives the rotation of the screw rod, and then the movement of the screw rod can drive the movement of the switching slider 14, and then the blocking of the liquid inlet 11 or the liquid return port 12 is achieved. The driving member 6 can also adopt two driving modes: a manual knob and an electromagnetic valve 61. When the electromagnetic valve 61 is accidentally damaged, the movement of the switching slider 14 can also be controlled by a manual knob. Or two driving modes of a manual knob and a stepper motor can be adopted.

[0062] By setting up the internal circulation pipeline, the fluid maintains a flowing state, so that the fluid maintains a relatively low temperature as a whole. When the terminal device 9 needs to be used, the valve body 1 can be switched from the internal circulation pipeline to the external circulation pipeline by adjusting the switching slider 14. Since the previous fluid has been maintaining an internal circulation state with a relatively low temperature, the temperature of the fluid retained in the valve body 1 is also relatively low. At this time, after switching to the external circulation state, the fluid with a relatively low temperature flows through the terminal device 9, which can quickly cool down the terminal device 9.

[0063] Reference Figure 5 and Figure 6 Furthermore, a cover plate 7 for reinforcing the driving member 6 is provided at one end of the driving member 6 close to the outer side of the valve body 1. By providing the cover plate 7, the connection of the driving member 6 is reinforced, so that the driving member 6 is more firmly connected in the valve body 1, and the driving member 6 is prevented from deviating and affecting the accuracy, resulting in a weakened blocking effect of the switching slider 14.

[0064] Reference Figure 3 and Figure 4Furthermore, the valve body 1 is made of a low-temperature resistant material. The valve body 1 is made of a low-temperature resistant material, which is convenient for placing the valve body 1 in a vacuum low-temperature box for heat insulation treatment. The temperature in the vacuum low-temperature box is low, and the valve body 1 is made of a low-temperature resistant material, which is not easy to cause damage to the valve body 1 in a low-temperature environment. In this embodiment, the low-temperature resistant material can be a low-temperature resistant material such as PEEK, low-temperature resistant silicone or polytetrafluoroethylene.

[0065] The implementation process of this embodiment is as follows: when the terminal device 9 is not needed, the switching slider 14 abuts the connecting channel 151, and the fluid is retained from the refrigeration main unit 8, flows through the external liquid inlet pipe 2, the liquid inlet port 11 and the internal liquid inlet pipe 111, and then enters the first cavity 15. At this time, the switching slider 14 blocks the connecting channel 151, so the liquid can only flow back from the internal liquid return pipe 121. The liquid flowing through the internal liquid return pipe 121 can flow to the second connecting pipe 55 and then flow into the internal one-way liquid flow pipe 54, but the internal one-way liquid flow pipe 54 is provided with a one-way valve 52, and at this time, the internal one-way liquid flow pipe 54 cannot circulate, so the fluid can only flow from the internal liquid return pipe 121 through the liquid return port 12 and the external liquid return pipe 3 and then flow back to the refrigeration main unit 8.

[0066] When the terminal device 9 needs to be used, the switching slider 14 abuts against one end of the inner liquid return pipe 121 close to the first cavity 15, and the fluid is retained from the refrigeration host 8, flows through the outer liquid inlet pipe 2, the liquid inlet port 11 and the inner liquid inlet pipe 111, and then enters the first cavity 15. At this time, the inner liquid return pipe 121 is blocked, and the connecting channel 151 is opened. The fluid flows from the first cavity 15 through the connecting channel 151, the second cavity 16, the first connecting pipe 17, the inner liquid outlet pipe 131, the outer liquid outlet pipe 4, the terminal device 9, the outer one-way liquid flow pipe 51, the inner one-way liquid flow pipe 54, the second connecting pipe 55, the inner liquid return pipe 121, the liquid return port 12 and the outer liquid return pipe 3, and then flows back to the refrigeration host 8.

[0067] Example 2

[0068] Reference Figure 1 and Figure 2 , an embodiment of the present invention also provides a cryoablation device, including a refrigeration main unit 8, the above-mentioned three-way valve and a terminal device 9, the refrigeration main unit 8, the three-way valve and the terminal device 9 are connected in sequence, and the terminal device 9 is also connected to the refrigeration main unit 8 to form a fluid circulation passage. The three-way valve is placed in a vacuum box, and the external liquid inlet pipe 2 and the external liquid return pipe 3 can be placed side by side in the vacuum pipe. The three-way valve is located in the vacuum box, and the external liquid inlet pipe 2 and the external liquid return pipe 3 are placed side by side in the vacuum pipe, which minimizes the heat leakage of the fluid. The cryoablation device adopts the above-mentioned three-way valve, which can quickly cool down the terminal device 9 and also reduce energy loss to a certain extent.

[0069] Among them, the refrigeration host 8 is a device that can refrigerate in the prior art, and the terminal device 9 can adopt the freezing balloon disclosed in the Chinese invention patent with authorization announcement number CN209301296U, or other devices that require low temperature.

[0070] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-way valve, comprising a valve body (1), the valve body (1) being provided with a liquid inlet (11) and a liquid return port (12), the liquid inlet (11) being plugged with an external liquid inlet pipe (2) for connecting to a refrigeration main unit (8), the liquid return port (12) being plugged with an external liquid return pipe (3) for connecting to a refrigeration main unit (8), characterized in that: The liquid inlet (11) and the liquid return port (12) are located on the same side of the valve body (1), and the external liquid inlet pipe (2) and the external liquid return pipe (3) can be placed side by side in a vacuum pipe; The external liquid inlet pipe (2) and the external liquid return pipe (3) are both axially parallel to the valve body (1); A first cavity (15) is provided in the valve body (1), an internal liquid inlet pipe (111) is connected between the liquid inlet port (11) and the first cavity (15), an internal liquid return pipe (121) is connected between the liquid return port (12) and the first cavity (15), a first circulation pipeline for cooling the valve body (1) is provided in the valve body (1), the first circulation pipeline comprising the internal liquid inlet pipe (111), the first cavity (15) and the internal liquid return pipe (121); A liquid outlet (13) is provided at one end of the valve body (1) away from the liquid inlet (11); an internal liquid outlet pipe (131) is provided in the valve body (1) and communicates with the first cavity (15) and the liquid outlet (13); and an external liquid outlet pipe (4) for connecting to a terminal device (9) is plugged into the liquid outlet (13); A one-way liquid flow port (5) is provided on one end of the valve body (1) away from the liquid inlet (11), and an external one-way liquid flow pipe (51) for connecting to the terminal device (9) is plugged into the one-way liquid flow port (5); An inner one-way liquid flow pipe (54) is provided in the valve body (1) and communicates with the one-way liquid flow port (5) and the liquid return port (12); A second circulation pipeline for cooling the terminal device (9) is provided in the valve body (1), and the second circulation pipeline comprises the inner liquid outlet pipe (131), the outer liquid outlet pipe (4), the outer one-way liquid flow pipe (51) and the inner one-way liquid flow pipe (54).

2. A three-way valve according to claim 1, characterized in that: A second connecting pipe (55) is connected between the inner one-way liquid flow pipe (54) and the inner liquid return pipe (121), and a one-way valve (52) is also provided in the inner one-way liquid flow pipe (54) for controlling the flow of liquid from the one-way liquid flow port (5) to the liquid return port (12).

3. A three-way valve as claimed in claim 2, characterized in that: The valve body (1) is provided with an installation cavity (53) for accommodating the one-way valve (52); the installation cavity (53) is respectively connected to the one-way liquid flow port (5) and the inner one-way liquid flow pipe (54); the one-way valve (52) includes a stopper (522) that can slidably block the one-way liquid flow port (5).

4. A three-way valve as claimed in claim 3, characterized in that: The one-way valve (52) further comprises an elastic member (521), the block (522) comprising a plugging head (5222) and a connecting rod (5221) arranged on the side of the plugging head (5222) away from the one-way liquid flow port (5), the elastic member (521) is sleeved on the connecting rod (5221), and one end of the elastic member (521) is in contact with the plugging head (5222), and the other end is in contact with the inner wall of the mounting cavity (53).

5. A three-way valve as claimed in claim 4, characterized in that: The elastic member (521) is configured as a conical spring.

6. A three-way valve according to claim 1, characterized in that: The valve body (1) is provided with a second cavity (16); the first cavity (15) and the second cavity (16) are connected via a connecting passage (151); the second cavity (16) and the inner liquid outlet pipe (131) are connected via a first connecting pipe (17); the three-way valve further comprises a switching slider (14) for switching from the first circulation pipeline to the second circulation pipeline; the switching slider (14) is provided in the first cavity (15), and the switching slider (14) can block an end of the inner liquid return pipe (121) close to the first cavity (15) or the connecting passage (151).

7. A three-way valve according to claim 6, characterized in that: A driving member (6) for controlling the movement of the switching slider (14) is installed in the second cavity (16).

8. A three-way valve according to claim 7, characterized in that: The driving member (6) is a solenoid valve (61), which is located inside the valve body (1), and one end of the piston rod of the solenoid valve (61) is fixedly connected to the switching slider (14).

9. A three-way valve according to claim 7, characterized in that: A cover plate (7) for reinforcing the driving member (6) is provided at one end of the driving member (6) close to the outer side of the valve body (1).

10. A three-way valve according to any one of claims 1 to 9, characterized in that: The valve body (1) is made of low-temperature resistant material.

11. A cryoablation device, characterized in that: It comprises a refrigeration main unit (8), a three-way valve as claimed in any one of claims 1 to 10 and a terminal device (9) connected in sequence, wherein the three-way valve is placed in a vacuum box, and the external liquid inlet pipe (2) and the external liquid return pipe (3) can be placed side by side in a vacuum pipe.

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