Heat exchange structure, cryoablation needle and cryoablation system

Abstract

The utility model discloses a heat exchange structure, a cryoablation needle and a cryoablation system, and relates to the technical field of medical instruments. The heat exchange structure is applied to the cryoablation needle, and the heat exchange structure comprises a first pipe body and a second pipe body; the peripheral side of the first pipe body is sleeved with the second pipe body at intervals, and a gap is formed between the second pipe body and the first pipe body; the first pipe body is provided with a through hole set communicated with the gap and the interior of the first pipe body, the through hole set is used for enabling a low-temperature medium in the first pipe body to be sprayed to the second pipe body, and the second pipe body is used for achieving heat exchange between the low-temperature medium and focus tissue. According to the heat exchange structure, the heat exchange efficiency can be improved, and the freezing effect is enhanced.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a heat exchange structure, a cryoablation needle, and a cryoablation system. Background Art

[0002] During the treatment of cryoablation, a cryoprobe is usually used to deliver a cryogenic medium to cool the diseased location, so as to destroy the diseased cells and achieve the treatment purpose.

[0003] However, in the process of heat exchange between the existing cryoprobe and the diseased tissue, there is a problem that the heat exchange efficiency is low, resulting in an unsatisfactory treatment effect. Summary of the Utility Model

[0004] This application provides a heat exchange structure, a cryoablation needle, and a cryoablation system to improve the heat exchange efficiency.

[0005] In a first aspect, this application provides a heat exchange structure applied to a cryoablation needle. The heat exchange structure includes a first tube body and a second tube body;

[0006] The second tube body is sleeved on the circumferential side of the first tube body at intervals and is configured with a gap;

[0007] A through-hole group communicating the gap and the inside of the first tube body is formed on the first tube body. The through-hole group is used to spray the cryogenic medium in the first tube body onto the second tube body, and the second tube body is used to realize the heat exchange between the cryogenic medium and the diseased tissue.

[0008] Based on the above technical solutions, the heat exchange structure provided by this application can spray the cryogenic medium in the first tube body onto the second tube body through the through-hole group. Thus, the cryogenic medium can directly contact the second tube body for heat exchange, and the cold quantity can be transferred to the diseased tissue of the patient through the second tube body, reducing the heat exchange path, increasing the heat exchange speed, further improving the heat exchange efficiency between the cryogenic medium and the diseased tissue, reducing the cold quantity loss, and enhancing the freezing effect.

[0009] In some possible implementation manners, the through-hole group includes at least one first through-hole group and at least one second through-hole group, and the at least one first through-hole group and the at least one second through-hole group are alternately arranged at intervals along the axial direction of the first tube body.

[0010] In some possible implementation manners, the first through-hole group includes a plurality of first through-holes, and the plurality of first through-holes are evenly spaced and formed on the circumferential direction of the first tube body;

[0011] The second through-hole group includes a plurality of second through-holes, and the plurality of second through-holes are evenly spaced and formed on the circumferential direction of the first tube body.

[0012] In some possible embodiments, in the adjacent first through - hole group and second through - hole group, the included angle α between the first through - hole and the adjacent second through - hole is such that 0° ≤ α ≤ 90°.

[0013] In some possible embodiments, the first through - hole group includes a plurality of first through - holes, and the plurality of first through - holes are evenly spaced and opened in the circumferential direction of the first tube body. The inner diameter R1 of the first through - hole is such that 0.01 mm ≤ R1 ≤ 0.5 mm.

[0014] In some possible embodiments, the second through - hole group includes a plurality of second through - holes, and the plurality of second through - holes are evenly spaced and opened in the circumferential direction of the first tube body. The inner diameter R2 of the second through - hole is such that 0.01 mm ≤ R2 ≤ 0.5 mm.

[0015] In some possible embodiments, the first through - hole group includes N1 first through - holes, and the N1 first through - holes are evenly spaced and opened in the circumferential direction of the first tube body, where 1 ≤ N1; and / or

[0016] The second through - hole group includes N2 second through - holes, and the N2 second through - holes are evenly spaced and opened in the circumferential direction of the first tube body, where 1 ≤ N2.

[0017] In some possible embodiments, the width M of the gap between the first tube body and the second tube body is such that 0.01 mm ≤ M ≤ 2.0 mm.

[0018] In a second aspect, the present application also provides a cryoablation needle, including a needle tube assembly and the heat exchange structure provided in each of the above embodiments, and the heat exchange structure is connected to one end of the needle tube assembly.

[0019] In a third aspect, the present application also provides a cryoablation system, including a cryogenic medium supply device and the heat exchange structure provided in each of the above embodiments;

[0020] The cryogenic medium supply device includes a supply end and a return end. The supply end is communicated with the first tube body, and the return end is communicated with the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1Shows a schematic cross-sectional structure diagram of a heat exchange structure in some embodiments;

[0023] Figure 2 Shows a schematic perspective structure diagram of a heat exchange structure in some other embodiments;

[0024] Figure 3 Shows a schematic structure diagram of a first tube body in some embodiments;

[0025] Figure 4 Shows a schematic cross-sectional structure diagram of a first tube body in some embodiments;

[0026] Figure 5 Shows a cross-sectional structure of a cryoablation needle in some embodiments;

[0027] Figure 6 Shows a schematic cross-sectional structure diagram of a needle tube assembly in some embodiments;

[0028] Figure 7 Shows a schematic cross-sectional structure diagram of a needle tube assembly in some other embodiments;

[0029] Figure 8 Shows a schematic structure diagram of a cryoablation system in some embodiments.

[0030] Description of main element symbols:

[0031] 1000 - Heat exchange structure;

[0032] 100 - First tube body; 101 - Through-hole group; 110 - First through-hole group; 111 - First through-hole; 120 - Second through-hole group; 121 - Second through-hole; 200 - Second tube body; 300 - Gap; 410 - First plug; 420 - Second plug; 500 - Adapter tube;

[0033] 2000 - Needle tube assembly; 2100 - Inlet tube; 2200 - Outlet tube; 2300 - Vacuum tube; 2410 - First void; 2420 - Second void;

[0034] 3000 - Tip structure; 4000 - Low-temperature medium supply device; 4100 - Supply end; 4200 - Return end. Detailed implementation manners

[0035] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0038] In the present application, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0040] As Figure 1 shown, in the embodiment, a heat exchange structure 1000 is provided, which can be applied to a cryoablation needle. Among them, the heat exchange structure 1000 can be inserted into the lesion tissue of a patient to achieve heat exchange between the cryogenic medium and the lesion tissue, transfer the cold quantity of the cryogenic medium to the lesion tissue, so as to provide a cryoablation function for the lesion tissue and destroy the diseased cells.

[0041] In some embodiments, the heat exchange structure 1000 includes a first tube body 100 and a second tube body 200. The second tube body 200 is sleeved on the circumferential side of the first tube body 100 at intervals, and a corresponding gap 300 is formed between the first tube body 100 and the second tube body 200. In addition, a through-hole group 101 is formed in the first tube body 100. The through-hole group 101 can communicate the inside of the first tube body 100 and the gap 300 between the first tube body 100 and the second tube body 200.

[0042] Combined with Figure 2 , in the embodiment, the second tube body 200 can be one of a cylindrical tube structure, an ellipsoidal tube structure, a polygonal prism tube structure, etc. And the second tube body 200 can be made of materials such as plastics and metals. It can be understood that the length of the heat exchange structure 1000 can be set as needed and will not be specifically limited here to meet the heat exchange requirements of different lengths.

[0043] During use, the heat exchange structure 1000 can be inserted into the lesion tissue of a patient. Among them, a cryogenic medium carrying cold can be input into the first tube body 100, and the cryogenic medium located inside the first tube body 100 can be sprayed onto the second tube body 200 through the through-hole group 101. When the cryogenic medium carrying cold contacts the second tube body 200, heat exchange can occur, and the second tube body 200 can transfer the cold to the lesion tissue. That is, the second tube body 200 can realize the heat exchange between the cryogenic medium and the lesion tissue, transfer the cold of the cryogenic medium to the lesion tissue, provide a cryoablation function for the lesion tissue to destroy diseased cells. In addition, the heat-exchanged cryogenic medium can be output from the gap 300 between the first tube body 100 and the second tube body 200.

[0044] In the embodiment, the cryogenic medium in the first tube body 100 is sprayed onto the second tube body 200 through the through-hole group 101. On the one hand, the moving speed of the cryogenic medium can be increased, the heat exchange path can be shortened, and the heat exchange efficiency between the cryogenic medium and the second tube body 200 can be improved. On the other hand, the heat exchange area between the cryogenic medium and the second tube body 200 can be increased, and then the efficient heat exchange area between the cryogenic medium and the lesion tissue can be increased, the heat exchange efficiency between the cryogenic medium and the lesion tissue can be improved, and the freezing effect can be enhanced. Thus, it can be ensured that the cold in the cryogenic medium is transferred to the lesion tissue through the second tube body 200 as much as possible. Furthermore, the cooling speed of the lesion tissue can be increased, the operation time can be shortened, and the discomfort of the patient can be reduced.

[0045] Such as Figure 1As shown, further, in some embodiments, the width M of the gap 300 between the second tube body 200 and the first tube body 100 can be set such that 0.01 mm ≤ M ≤ 2.0 mm, which can ensure the contact efficiency between the cryogenic medium and the second tube body 200, thereby improving the heat conduction efficiency between the cryogenic medium and the lesion tissue. Exemplarily, the width M of the gap 300 between the second tube body 200 and the first tube body 100 can be set to 0.01 mm, 0.04 mm, 0.05 mm, 0.15 mm, 0.2 mm, 0.28 mm, 0.36 mm, 0.42 mm, 0.45 mm, 0.5 mm, 0.65 mm, 0.7 mm, 0.95 mm, 1.02 mm, 1.12 mm, 1.24 mm, 1.35 mm, 1.5 mm, 1.7 mm, 1.85 mm, 2.0 mm or any other value between 0.01 mm and 2.0 mm.

[0046] As Figure 1 , Figure 3 and Figure 4 As shown, further, in some embodiments, the through-hole group 101 can include at least one first through-hole group 110 and at least one second through-hole group 120. The at least one first through-hole group 110 and the at least one second through-hole group 120 can be alternately arranged in sequence along the axial direction of the first tube body 100, and there is a gap between the first through-hole group 110 and the adjacent second through-hole group 120. Among them, the axial direction of the first tube body 100 can be coaxial with the axial direction of the heat exchange structure 1000, and the axial direction of the heat exchange structure 1000 can refer to the extending direction of the axis L.

[0047] Exemplarily, the through-hole group 101 can include one group, two groups, four groups, or six groups, etc., of first through-hole groups 110. The through-hole group 101 can include one group, two groups, four groups, or six groups, etc., of second through-hole groups 120. And the number of groups of the first through-hole group 110 is equal to or differs by one group from the number of groups of the second through-hole group 120.

[0048] As Figure 3 shown, in some embodiments, the through-hole group 101 can include two first through-hole groups 110 and one second through-hole group 120. Along the axial direction of the first tube body 100, the second through-hole group 120 can be arranged between the two first through-hole groups 110, and there is an interval between the second through-hole group 120 and the first through-hole groups 110 on both sides.

[0049] In an embodiment, the first through-hole group 110 can include several first through-holes 111. The first through-hole group 110 can include N1 first through-holes 111, where 1 ≤ N1, and it can be understood that N1 is an integer. Exemplarily, the first through-hole group 110 can include 1, 2, 3, 5, 7, 8, or any other number of first through-holes 111.

[0050] In some embodiments, the first through-hole group 110 includes a plurality of first through-holes 111. The plurality of first through-holes 111 may be evenly spaced along the circumferential direction of the first tube body 100. Thus, the cryogenic medium in the first tube body 100 can be sprayed through the first through-hole group 110 to various parts of the circumferential direction of the second tube body 200.

[0051] In other embodiments, the plurality of first through-holes 111 may be unevenly distributed along the circumferential direction of the first tube body 100.

[0052] In some specific embodiments, the first through-hole group 110 may include four first through-holes 111. The four first through-holes 111 are evenly spaced and opened in the circumferential direction of the first tube body 100 and are located on the same circumference. It can be understood that each first through-hole 111 in the first through-hole group 110 communicates with the inside of the first tube body 100 and the gap 300.

[0053] In an embodiment, the second through-hole group 120 may include several second through-holes 121. The second through-hole group 120 may include N2 first through-holes 111, where 1 ≤ N2, and it can be understood that N2 is an integer. Exemplarily, the second through-hole group 120 may include 1, 2, 3, 5, 7, 8 or any other number of second through-holes 121.

[0054] In some embodiments, the second through-hole group 120 includes a plurality of second through-holes 121. The plurality of second through-holes 121 may be evenly spaced along the circumferential direction of the first tube body 100. Thus, the cryogenic medium in the first tube body 100 can be sprayed through the second through-hole group 120 to various parts of the circumferential direction of the second tube body 200.

[0055] In other embodiments, the plurality of second through-holes 121 may be unevenly distributed along the circumferential direction of the first tube body 100.

[0056] In some specific embodiments, the second through-hole group 120 may include four second through-holes 121. The four second through-holes 121 are evenly spaced and opened in the circumferential direction of the first tube body 100 and are located on the same circumference. It can be understood that each second through-hole 121 in the second through-hole group 120 communicates with the inside of the first tube body 100 and the gap 300.

[0057] Such as Figure 3 and Figure 4As shown, in some embodiments, in adjacent first through-hole groups 110 and second through-hole groups 120, a plurality of first through-holes 111 and a plurality of second through-holes 121 are arranged alternately in sequence along the circumferential direction of the first pipe body 100. That is, in adjacent first through-hole groups 110 and second through-hole groups 120, along the circumferential direction of the first pipe body 100, the first through-holes 111 and the adjacent second through-holes 121 are arranged in a staggered manner. Thus, it can be ensured that the low-temperature medium in the first pipe body 100 can be sprayed through the through-hole group 101 to various parts of the circumferential direction of the second pipe body 200, reducing the interference between the first through-hole group 110 and the second through-hole group 120, increasing the efficient heat exchange area between the low-temperature medium and the second pipe body 200, and improving the heat exchange efficiency.

[0058] Of course, in some other embodiments, in adjacent first through-hole groups 110 and second through-hole groups 120, along the circumferential direction of the first pipe body 100, the first through-holes 111 and the adjacent second through-holes 121 may also not be arranged in a staggered manner.

[0059] In an embodiment, in adjacent first through-hole groups 110 and second through-hole groups 120, the included angle α between the first through-holes 111 and the adjacent second through-holes 121 can be set such that 0° ≤ α ≤ 90°. Thus, it can be further ensured that the low-temperature medium in the first pipe body 100 is sprayed more evenly through the through-hole group to various parts of the second pipe body 200, reducing the interference between the first through-hole group 110 and the second through-hole group 120, increasing the heat exchange area between the low-temperature medium and the second pipe body 200, and enhancing the heat exchange efficiency. Exemplarily, in adjacent first through-hole groups 110 and second through-hole groups 120, the included angle α between the first through-holes 111 and the adjacent second through-holes 121 can be set to 0°, 15°, 22.5°, 23°, 25°, 27.5°, 32°, 35°, 37.5°, 40°, 43.5°, 45°, 52°, 56°, 60°, 65°, 67.5°, 71°, 72.5°, 78°, 82.5°, 85°, 90° or any other angle within 0° to 90°.

[0060] Such as Figure 3 and Figure 4As shown, further, in some embodiments, the inner diameter R1 of the first through hole 111 can be set such that 0.01 mm ≤ R1 ≤ 0.5 mm, which can provide a suitable throttling and pressure boosting effect for the cryogenic medium, ensuring that the cryogenic medium inside the first tube body 100 has sufficient pressure to quickly spray towards the second tube body 200, enabling the cryogenic medium to directly contact the second tube body 200 for heat exchange. On the one hand, it can increase the spraying speed of the cryogenic medium and improve the cold quantity transfer efficiency. On the other hand, it can also reduce the loss of cold quantity during the heat exchange process. Exemplarily, the inner diameter R1 of the first through hole 111 can be set to 0.01 mm, 0.03 mm, 0.05 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.22 mm, 0.26 mm, 0.27 mm, 0.3 mm, 0.33 mm, 0.36 mm, 0.38 mm, 0.42 mm, 0.45 mm, 0.49 mm, 0.5 mm or any other value within 0.01 mm to 0.5 mm.

[0061] In some embodiments, the inner diameter R2 of the second through hole 121 can be set such that 0.01 mm ≤ R2 ≤ 0.5 mm, which can provide a suitable throttling and pressure boosting effect for the cryogenic medium, ensuring that the cryogenic medium inside the first tube body 100 has sufficient pressure to quickly spray towards the second tube body 200, enabling the cryogenic medium to directly contact the second tube body 200 for heat exchange. On the one hand, it can increase the spraying speed of the cryogenic medium and improve the cold quantity transfer efficiency. On the other hand, it can also reduce the loss of cold quantity during the heat exchange process. Exemplarily, the inner diameter R2 of the second through hole 121 can be set to 0.01 mm, 0.03 mm, 0.05 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.22 mm, 0.26 mm, 0.27 mm, 0.3 mm, 0.33 mm, 0.36 mm, 0.38 mm, 0.42 mm, 0.45 mm, 0.49 mm, 0.5 mm or any other value within 0.01 mm to 0.5 mm.

[0062] In this application, the cryogenic medium in the first tube body 100 sprays towards the second tube body 200 through the staggered first through hole group 110 and second through hole group 120, enabling the cryogenic medium to directly contact the second tube body 200 for heat exchange. On the one hand, it can improve the heat exchange efficiency between the cryogenic medium and the second tube body 200, allowing the cold quantity in the cryogenic medium to quickly transfer to the lesion tissue through the second tube body 200 and enhancing the refrigeration efficiency of the cryoablation needle. On the other hand, it can also reduce the loss of the cold quantity carried by the cryogenic medium, ensuring that the cold quantity in the cryogenic medium is transferred to the lesion tissue through the second tube body 200 as much as possible, and can also reduce the use of the cryogenic medium and lower the cost.

[0063] As Figure 5As shown, in the embodiments, a cryoablation needle is further provided, which may include the heat exchange structure 1000 provided in the embodiments. Additionally, the cryoablation needle further includes a needle tube assembly 2000, and the heat exchange structure 1000 may be connected to one end of the needle tube assembly 2000.

[0064] Combined with Figure 6 , the needle tube assembly 2000 may include an inlet tube 2100, an outlet tube 2200, and a vacuum tube 2300. In some embodiments, the inlet tube 2100 and the outlet tube 2200 may be arranged in parallel within the vacuum tube 2300, and a first gap 2410 is formed between them and the vacuum tube 2300. Among them, the inlet tube 2100 may be internally connected to the first tube body 100, and the outlet tube 2200 may be connected to the gap 300 between the first tube body 100 and the second tube body 200. Additionally, the first gap 2410 within the vacuum tube 2300 may be evacuated or filled with heat insulation materials such as polyurethane foam, polyimide film, aerogel felt, etc., which can reduce the loss of cold energy of the low-temperature medium in the inlet tube 2100.

[0065] As Figure 7 shown, in some other embodiments, the outlet tube 2200 may also be sleeved outside the inlet tube 2100 at intervals, and a second gap 2420 is formed between the outlet tube 2200 and the inlet tube 2100, that is, the outlet tube 2200 is located between the inlet tube 2100 and the vacuum tube 2300. Additionally, the first gap 2410 may be formed between the outlet tube 2200 and the vacuum tube 2300. Among them, the inlet tube 2100 may be internally connected to the first tube body 100, and the second gap 2420 may be connected to the gap 300 between the first tube body 100 and the second tube body 200. The first gap 2410 may be evacuated or filled with heat insulation materials such as polyurethane foam, polyimide film, aerogel felt, etc.

[0066] As Figure 5 shown, in some embodiments, one end of the first tube body 100 close to the needle tube assembly 2000 may be blocked by a first plug 410 and connected to the inlet tube 2100 through an adapter tube 500. One end of the first tube body 100 far from the needle tube assembly 2000 may be blocked by a second plug 420. Thus, it can be ensured that the low-temperature medium in the first tube body 100 is sprayed towards the second tube body 200 through the through-hole group 101 as much as possible, improving the heat exchange efficiency.

[0067] As Figure 5 shown, in some embodiments, the cryoablation needle further includes a tip structure 3000. The tip structure 3000 may be connected to the end of the heat exchange structure 1000 far from the needle tube assembly 2000. It can be understood that the end of the tip structure 3000 far from the heat exchange structure 1000 may be a tip. During use, the tip structure 3000 can be used for puncture, which is beneficial for inserting into the patient's lesion tissue and enabling the heat exchange structure 1000 to be smoothly inserted into the lesion tissue.

[0068] As shown Figure 8 In the embodiment, a cryoablation system is further provided, which may include the cryoablation needle provided in the embodiment. In addition, the cryoablation system further includes a cryogenic medium supply device 4000, which can be used to supply cryogenic medium to the cryoablation needle to provide the cooling capacity required for cryoablation.

[0069] Specifically, the cryogenic medium supply device 4000 may include a supply end 4100 and a return end 4200. Among them, the supply end 4100 can be internally connected to the first tube body 100 of the heat exchange structure 1000 through the inlet tube 2100. The return end 4200 can be connected to the gap 300 between the first tube body 100 and the second tube body 200 through the outlet tube 2200.

[0070] During use, the cryogenic medium supply device 4000 can transport the cryogenic medium carrying cooling capacity to the inlet tube 2100 through the supply end 4100, and transport it to the first tube body 100 through the inlet tube 2100. The cryogenic medium in the first tube body 100 can be sprayed onto the second tube body 200 through the through-hole group 101 and perform heat exchange with the second tube body 200. The cooling capacity in the cryogenic medium can be transferred to the lesion tissue through the second tube body 200. The cryogenic medium after heat exchange can be transported to the outlet tube 2200 through the gap 300, and transported to the return end 4200 of the cryogenic medium supply device 4000 through the outlet tube 2200.

[0071] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A heat exchange structure, characterized in that: Applied to a cryoablation needle, the heat exchange structure comprises a first tube body and a second tube body; The second tube body is sleeved on the circumference of the first tube body at intervals and is provided with a gap; The first tube body is provided with a through hole group connecting the gap and the inside of the first tube body, the through hole group is used to spray the low-temperature medium in the first tube body to the second tube body, and the second tube body is used to achieve heat exchange between the low-temperature medium and the lesion tissue.

2. The heat exchange structure according to claim 1, characterized in that: The through hole group includes at least one first through hole group and at least one second through hole group, and the at least one first through hole group and the at least one second through hole group are alternately arranged in sequence along the axial direction of the first tube body.

3. The heat exchange structure according to claim 2, characterized in that: The first through hole group includes a plurality of first through holes, and the plurality of first through holes are evenly spaced and opened in the circumference of the first tube body; The second through hole group includes a plurality of second through holes, and the plurality of second through holes are evenly spaced and opened in the circumference of the first tube body.

4. The heat exchange structure according to claim 3, characterized in that: In the adjacent first through hole group and the second through hole group, the included angle α between the first through hole and the adjacent second through hole is 0°≤α≤180°.

5. The heat exchange structure according to any one of claims 2 to 4, characterized in that: The first through hole group includes a plurality of first through holes, and the plurality of first through holes are evenly spaced and opened in the circumference of the first tube body. The inner diameter R1 of the first through hole is 0.01 mm≤R1≤0.5 mm.

6. The heat exchange structure according to any one of claims 2 to 4, characterized in that: The second through hole group includes a plurality of second through holes, and the plurality of second through holes are evenly spaced and opened in the circumference of the first tube body. The inner diameter R2 of the second through hole is 0.01 mm≤R2≤0.5 mm.

7. The heat exchange structure according to any one of claims 2 to 4, characterized in that: The first through hole group includes N1 first through holes, and the N1 first through holes are evenly spaced and opened in the circumference of the first tube body, wherein 1≤N1; and / or The second through hole group includes N2 second through holes, and the N2 second through holes are evenly spaced and opened in the circumference of the first tube body, wherein 1≤N2.

8. The heat exchange structure according to claim 1, characterized in that: The width M of the gap between the first tube body and the second tube body is 0.01 mm≤M≤2.0 mm.

9. A cryoablation needle, characterized in that: It comprises a needle tube assembly and a heat exchange structure as claimed in any one of claims 1 to 8, wherein the heat exchange structure is connected to one end of the needle tube assembly.

10. A cryoablation system, characterized in that: It comprises a low temperature medium supply device and a heat exchange structure according to any one of claims 1 to 8; The low-temperature medium supply device includes a supply end and a return end, the supply end is communicated with the first tube body, and the return end is communicated with the gap.

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