Ablation needle and ablation system

Abstract

The application provides an ablation needle and an ablation system, comprising: an ablation needle part, a temperature insulation sheath pipe; the ablation needle part comprises: a needle rod, a vacuum inner wall pipe and an air inlet pipe, the distal end of the needle rod is provided with a needle tip; the temperature insulation sheath pipe is sleeved on the needle rod; the two are detachably connected; the distal end of the needle rod and the distal end of the temperature insulation sheath pipe have a preset distance, and a region where the preset distance is located is a target area; the distal end of the temperature insulation sheath pipe is an end of the temperature insulation sheath pipe close to the needle tip; the vacuum inner wall pipe is inserted into the needle rod, and a sandwich layer is formed between the two; the sandwich layer is a sandwich layer capable of forming a vacuum; the air inlet pipe is inserted into the needle rod, the distal end of the air inlet pipe extends into the target area, and the distal end of the air inlet pipe is an end of the air inlet pipe close to the needle tip. Through the design of the temperature insulation sheath pipe and the detachable connection between the temperature insulation sheath pipe and the needle rod, the application can realize single needle channel biopsy and ablation, and avoid the harm to the patient caused by secondary puncture.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ablation technology, in particular to an ablation needle and an ablation system. BACKGROUND

[0002] Before percutaneous puncture cryoablation, puncture biopsy is often needed to identify the development stage of the tumor, and each of the biopsy and the ablation needs to be punctured at least once. The increase in the number of punctures increases the complications such as bleeding, metastasis and pneumothorax. SUMMARY

[0003] The present application provides an ablation needle and an ablation system to solve the problem of multiple punctures in the prior art.

[0004] According to a first aspect of the present application, an ablation needle is provided, comprising: an ablation needle part, a temperature insulation sheath tube; wherein,

[0005] The ablation needle part comprises: a needle shaft, a vacuum inner wall tube and an air inlet pipe, the distal end of the needle shaft has a needle tip;

[0006] The temperature insulation sheath tube is sleeved on the needle shaft; the temperature insulation sheath tube and the needle shaft are detachably connected;

[0007] The distal end of the needle shaft and the distal end of the temperature insulation sheath tube have a preset distance, and a region where the preset distance is located is a target area; the distal end of the temperature insulation sheath tube is an end of the temperature insulation sheath tube close to the needle tip;

[0008] The vacuum inner wall tube is inserted into the needle shaft, and the vacuum inner wall tube and the needle shaft form a sandwich layer, and the sandwich layer is a sandwich layer capable of forming a vacuum;

[0009] The air inlet pipe is inserted into the needle shaft, the distal end of the air inlet pipe extends into the target area, and the distal end of the air inlet pipe is an end of the air inlet pipe close to the needle tip.

[0010] Preferably, the temperature insulation sheath tube comprises: a sheath tube outer layer and a sheath tube inner layer;

[0011] The sheath tube outer layer is sleeved on the sheath tube inner layer, and the sheath tube outer layer and the sheath tube inner layer form a sheath tube sandwich layer, and the sheath tube sandwich layer is a sandwich layer capable of forming a vacuum.

[0012] Preferably, the distal end of the temperature insulation sheath tube is provided with a chamfered portion on the end face.

[0013] Preferably, it further comprises: a handle part, the handle part comprises a sheath tube connector, and the sheath tube connector is connected with the temperature insulation sheath tube.

[0014] Preferably, the handle part further comprises: a sealing assembly;

[0015] The proximal end of the sheath connector extends out of the proximal end of the temperature-insulated sheath, and the proximal end of the needle rod extends out of the proximal end of the temperature-insulated sheath; the proximal end of the sheath connector is the end of the sheath connector that is away from the needle tip;

[0016] The sealing assembly is used to isolate the inner and outer spaces of the handle part.

[0017] Preferably, the sealing assembly comprises a sealing ring and a sealing ring pressing member, wherein,

[0018] The sealing ring is sleeved on the needle rod, and the sealing ring pressing member is pressed on the outer wall of the sealing ring.

[0019] Preferably, the handle part further comprises a suction interface.

[0020] The gap between the needle rod and the temperature-insulated sheath forms a suction cavity.

[0021] One end of the suction interface is connected to the suction cavity.

[0022] Preferably, the needle rod and the temperature-insulated sheath can slide relative to each other along the axial direction of the needle rod to adjust the length of the target area.

[0023] Preferably, the device further comprises a locking positioning member that can control the relative sliding between the needle rod and the temperature-insulated sheath.

[0024] Preferably, the locking positioning member comprises a first locking positioning member and a second locking positioning member, wherein,

[0025] One end of the first locking positioning member is directly or indirectly connected to the temperature-insulated sheath, and the other end of the first locking positioning member can be controlled to be locked to the second locking positioning member.

[0026] The second locking positioning member can control the relative sliding between the first locking positioning member and the needle rod.

[0027] Preferably, the first locking positioning member comprises a first positioning member and a first locking member.

[0028] The second locking positioning member comprises a second positioning member and a second locking member; wherein,

[0029] The distal end of the first positioning member is directly or indirectly connected to the temperature-insulated sheath, and the proximal end of the first positioning member is sleeved on the second positioning member; the distal end of the first positioning member is the end of the first positioning member that is close to the needle tip.

[0030] The first locking member is sleeved on the first positioning member and can be controlled to lock, so as to lock the proximal end of the first positioning member to the second positioning member.

[0031] The second positioning member is sleeved on the needle rod, and the second locking member is sleeved on the proximal end of the second positioning member and can be controlled to lock, so as to lock the proximal end of the second positioning member to the needle rod. The proximal end of the second positioning member is an end away from the needle tip.

[0032] Preferably, the direct or indirect connection between the first positioning member and the temperature insulation sheath is fixed through a luer joint.

[0033] Preferably, the proximal end of the first positioning member is a multi-claw structure, and when the first locking member is controlled to lock, the multi-claw structure of the first positioning member can be forced to contract inward and tightly hold the second positioning member.

[0034] And / or,

[0035] The proximal end of the second positioning member is a multi-claw structure, and when the second locking member is controlled to lock, the multi-claw structure of the second positioning member can be forced to contract inward and tightly hold the needle rod.

[0036] Preferably, the second positioning member is provided with a scale, which can indicate the length of the current target area.

[0037] According to the second aspect of the present application, an ablation system is provided, which comprises the ablation needle of any one of the above.

[0038] The ablation needle and the ablation system provided by the present application can realize biopsy and ablation of a single needle channel without pulling out the temperature insulation sheath, thereby avoiding the harm to the patient caused by secondary puncture.

[0039] The ablation needle and the ablation system provided by the present application can realize double-layer temperature insulation through the design of the vacuum inner tube and the temperature insulation sheath, and the other layer of the temperature insulation can still play a role in temperature insulation in the case that one layer of the temperature insulation fails, so that the temperature insulation is more secure.

[0040] In an optional solution of the present application, the ablation needle target area is adjustable through the design of the two-layer structure, the vacuum inner tube is the inner layer structure, and the needle rod is the outer layer structure. The two-layer structure is: the vacuum inner tube and the needle rod. Most of the existing cold ablation needles with adjustable target area function adopt a three-layer tube structure (needle rod, vacuum outer layer tube, and vacuum inner layer tube). Compared with the three-layer tube structure in the prior art, the two-layer structure of the present application reduces the diameter of the ablation needle, that is, can effectively reduce the needle channel wound in the tumor, and reduce the incidence of complications such as bleeding, pneumothorax, and needle channel implantation.

[0041] In an optional solution of the present application, the length of the targeting area can be adjusted by the relative sliding between the needle rod and the temperature-insulation sheath along the axial direction of the needle rod, the targeting area of different length can be selected according to the size of the tumor, and then the size and shape of the ice ball can be adjusted, which can better conform to the ablation, and can avoid excessive ablation, incomplete ablation or freezing of the surrounding organs and blood vessels. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0043] Figure 1 The schematic diagram of the ablation needle of an embodiment of the present application;

[0044] Figure 2 The chamfering schematic diagram of the temperature-insulation sheath of an embodiment of the present application;

[0045] Figure 3 The schematic diagram of the ablation needle of an embodiment of the present application;

[0046] Figure 4 The partial enlarged view of the ablation needle of an embodiment of the present application;

[0047] Figure 5 The schematic diagram of the ablation needle of another embodiment of the present application;

[0048] Figure 6 The schematic diagram of the suction cavity of another embodiment of the present application;

[0049] Figure 7 The schematic diagram of the locking positioning member of an embodiment of the present application;

[0050] Explanation of reference signs:

[0051] 1-sheath part,

[0052] 11-temperature-insulation sheath,

[0053] 111-sheath outer layer,

[0054] 112-sheath inner layer,

[0055] 12-chamfering,

[0056] 13-suction cavity;

[0057] 2-ablation needle part,

[0058] 2 ， - targeting zone,

[0059] 21- needle shaft,

[0060] 211- needle tip,

[0061] 22- air inlet pipe,

[0062] 23- inner vacuum pipe,

[0063] 24- gasket;

[0064] 3- handle part,

[0065] 31- sheath pipe connector,

[0066] 32- sealing ring,

[0067] 33- sealing ring presser,

[0068] 34- suction port;

[0069] 4- locking positioning member,

[0070] 41- first positioning member,

[0071] 42- first locking member,

[0072] 43- second positioning member,

[0073] 44- second locking member. DETAILED DESCRIPTION

[0074] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0075] In the description of the present application, it should be understood that the terms "upper", "lower", "upper end", "lower end", "lower surface", "upper surface" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0076] In the description of the present application, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features.

[0077] In the description of the present application, the meaning of "a plurality of" is a plurality, for example, two, three, four, etc., unless otherwise explicitly specified and limited.

[0078] In the description of the present application, unless otherwise explicitly specified and limited, the term "connection" and other terms should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0079] The technical solutions of the present application will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described in detail in some examples.

[0080] In an embodiment, an ablation needle is provided, which comprises: a sheath tube part 1, an ablation needle part 2, please refer to Figure 1 . Wherein, the sheath tube part 1 comprises: a temperature insulation sheath tube 11; the ablation needle part comprises: a needle rod 21, an air inlet pipe 22, a vacuum inner tube 23, the distal end of the needle rod 21 has a needle tip 211; the temperature insulation sheath tube 11 is sleeved on the needle rod 21, and the temperature insulation sheath tube 11 and the needle rod 21 are detachably connected. The distal end of the needle rod 21 and the distal end of the temperature insulation sheath tube 11 have a preset distance, and the region where the preset distance is located is a target area 2 ， ; the distal end of the temperature insulation sheath tube 11 is the end of the temperature insulation sheath tube 11 close to the needle tip 211. The vacuum inner tube 23 is arranged in the needle rod 21, and the vacuum inner tube 23 and the needle rod 21 form a sandwich layer, which is a sandwich layer capable of forming a vacuum. The air inlet pipe 22 is inserted into the needle rod 21, and the distal end of the air inlet pipe 22 extends into the target area 2 ， , and the distal end of the air inlet pipe 22 is the end of the air inlet pipe 22 close to the needle tip 211.

[0081] When the ablation needle of the above-mentioned embodiment is used for ablation, the refrigerant or high-pressure gas reaches the target area 2 ， through the inner cavity of the air inlet pipe 22 to ablate the tumor on the outer wall, and then the refrigerant or high-pressure gas is recovered through the cavity between the needle rod 21 and the air inlet pipe 22.

[0082] The ablation needle of the above embodiment separates the heat insulation sheath and the needle rod, through the design of the independent heat insulation sheath, and the detachable connection between the heat insulation sheath and the needle rod, the needle rod in the heat insulation sheath can be exchanged as needed, the heat insulation sheath does not need to be pulled out, the independent needle rod can also realize single needle channel biopsy and ablation, and the biopsy and ablation only need to be punctured once, so that the number of punctures can be reduced, and complications such as bleeding, metastasis and pneumothorax caused by an increase in the number of punctures can be avoided. In addition, a vacuum inner tube is also provided, through the design of the vacuum inner tube and the heat insulation sheath, double-layer heat insulation is realized, the heat insulation effect is better, in the case that one layer of heat insulation fails, the other layer of heat insulation can still play a heat insulation role, and the heat insulation is more secure. Further, the above embodiment adopts a two-layer structure design, the vacuum inner tube is an inner layer structure, and the needle rod is an outer layer structure, so that the target area can be adjusted, and the two-layer structure is: the vacuum inner tube and the needle rod; most of the existing technology of the cryoablation needle with adjustable target area function adopts a three-layer tube structure (needle tube, vacuum outer layer tube and vacuum inner layer tube), compared with the three-layer tube structure in the prior art, the two-layer structure of the present application reduces the diameter of the ablation needle, that is, the needle channel wound in the tumor can be effectively reduced, and the incidence of complications such as bleeding, pneumothorax and needle channel implantation can be reduced.

[0083] In an embodiment, the vacuum inner tube 23 and the needle rod 21 are sealed by a gasket 24, and the gasket 24 is sleeved on the distal end of the vacuum inner tube 23, please refer to Figure 4 . The proximal end of the vacuum inner tube 23 and the needle rod can also be sealed by a gasket, or can also be sealed by vacuum welding.

[0084] In different embodiments, the distal end of the vacuum inner tube 23 and the needle rod 21 can also be sealed by vacuum welding.

[0085] In an embodiment, the heat insulation sheath 11 comprises: a sheath outer layer 111 and a sheath inner layer 112; the sheath outer layer 111 is sleeved on the sheath inner layer 112, and a sheath interlayer is formed between the sheath outer layer 111 and the sheath inner layer 112, which is a interlayer capable of forming a vacuum.

[0086] In an embodiment, in order to facilitate puncture, the distal end surface of the heat insulation sheath 11 is provided with a chamfer 12, please refer to Figure 1 , Figure 2 When the heat insulation sheath is punctured with the ablation needle, the puncture resistance can be reduced.

[0087] The material and form of the heat insulation sheath 11 are not limited, and preferably a stainless steel tube.

[0088] In an embodiment, the ablation needle further comprises: a handle part 3, the handle part 3 comprises a sheath connecting piece 31, and the sheath connecting piece 31 is connected with the heat insulation sheath 11, please refer to Figure 3 .

[0089] In an embodiment, the sheath connecting piece 31 and the temperature-insulation sheath 11 can be connected together by means of adhesion, welding, injection molding, or the like.

[0090] In an embodiment, the handle part 3 further comprises: a sealing assembly; the proximal end of the sheath connecting piece 31 extends out of the proximal end of the temperature-insulation sheath 11, and the proximal end of the needle rod 21 extends out of the proximal end of the temperature-insulation sheath 11; the proximal end of the sheath connecting piece 31 is the end of the sheath connecting piece 31 that is far away from the needle tip 211. The sealing assembly is used to isolate the inner and outer spaces of the handle part.

[0091] In an embodiment, the sealing assembly comprises: a sealing ring 32, and a sealing ring pressing piece 33, please refer to Figure 3 . Under normal circumstances, the central cavity of the sealing ring 32 is in a closed state, which can isolate the inner and outer spaces of the handle 3; when the temperature-insulation sheath and the ablation needle part are used together, the needle rod 21 passes through the central cavity of the sealing ring 32 to make it expand, at this time the sealing ring 32 tightly wraps the needle rod, realizing sealing and also isolating the inner and outer spaces of the handle 3. The sealing ring pressing piece 33 is pressed on the outer wall of the sealing ring 32, and the sealing ring pressing piece 33 is used to press the sealing ring 32 to limit the movement of the sealing ring 32.

[0092] In an embodiment, the sealing ring 32 is preferably a self-sealing silicone sealing ring.

[0093] In an embodiment, the handle part further comprises: a suction port 34; the gap between the needle rod 21 and the temperature-insulation sheath 11 forms a suction cavity 13, please refer to Figure 5 ; one end of the suction port 34 is connected to the suction cavity 13, please refer to Figure 5 . The other end of the suction port 34 can be externally connected to a suction device, such as a suction pump, a suction balloon, or the like. When the ablation needle punctures into the lesion area, the effusion, blood, or gas overflowed from pneumothorax in the patient's body can all flow through the suction cavity 13 to the outside of the suction port 34, thereby preventing complications such as effusion, massive bleeding in the body, pneumothorax, and the like.

[0094] In an embodiment, the needle rod and the temperature-insulation sheath can relatively slide along the axial direction of the needle rod to adjust the length of the target area 2 ， .

[0095] In an embodiment, it further comprises: a locking positioning piece 4, which can be controlled to limit the relative sliding between the needle rod 21 and the temperature-insulation sheath 11, so as to fix the length of the current target area 2 ， .

[0096] In an embodiment, the locking positioning member 4 comprises: a first locking positioning member and a second locking positioning member, wherein one end of the first locking positioning member is directly or indirectly connected to the temperature insulation sheath 11, and the other end of the first locking positioning member can be controlled to be locked to the second locking positioning member; the second locking positioning member can be controlled to limit the relative sliding between the first locking positioning member and the needle rod.

[0097] In an embodiment, one end of the first locking positioning member is indirectly connected to the temperature insulation sheath 11 through a sealing ring pressing member.

[0098] In an embodiment, the first locking positioning member comprises: a first positioning member 41 and a first locking member 42; and the second locking positioning member comprises: a second positioning member 43 and a second locking member 44; wherein the distal end of the first positioning member 41 is connected to the sheath connecting member 31, the proximal end of the first positioning member 41 is sleeved on the second positioning member 43, and the two can be coaxially displaced, the distal end of the first positioning member 41 is the end close to the needle tip 211; the first locking member is sleeved on the first positioning member 41 and can be controlled to be locked to lock the proximal end of the first positioning member 41 to the second positioning member 43; the second positioning member 43 is sleeved on the needle rod 21, and the second locking member 44 is sleeved on the proximal end of the second positioning member 43 and can be controlled to be locked to lock the proximal end of the second positioning member 43 to the needle rod 21; the proximal end of the second positioning member 43 is the end away from the needle tip 211.

[0099] The locking positioning member 4 in the above embodiment plays a role in fixing the temperature insulation sheath 11 and the ablation needle part 2, i.e. fixing the length of the current target area; on the other hand, the locking positioning member 4 can isolate temperature, and together with the interlayer between the needle rod and the vacuum inner tube, plays a double-layer protection effect, further protecting the safety of the operator.

[0100] In an embodiment, the connection between the first positioning member 41 and the sheath connecting member 31 is fixed through a luer joint, specifically: the distal end of the first positioning member 41 is a luer joint, which is fixed with the luer joint provided at the proximal end of the sheath connecting member 31.

[0101] In an embodiment, the proximal end of the first positioning member 41 is a multi-claw structure, and when the first locking member 42 is controlled to be locked, the multi-claw structure of the first positioning member 41 can be forced to shrink inwardly and tightly grip the second positioning member 43. And / or, the proximal end of the second positioning member 43 is a multi-claw structure, and when the second locking member 44 is controlled to be locked, the multi-claw structure of the second positioning member 43 can be forced to shrink inwardly and tightly grip the needle rod 21.

[0102] In one embodiment, the multi-prong structure of the first positioning member 41 is provided with a certain angle, and the first locking member 42 is also provided with a certain angle, which can force the multi-prong structure to shrink inward when the first locking member 42 is locked.

[0103] In one embodiment, the second positioning member is provided with a scale, please refer to Figure 6 , which can indicate the length of the current target area.

[0104] The locking and positioning element structure is various, which is not limited to the structure used in the above embodiment, such as: locking and positioning nails, positioning pins or sliding block positioning can also be used.

[0105] The ablation needle part of the above embodiment can be a cryoablation needle, or other diagnosis and treatment products, such as: radiofrequency ablation needle, microwave ablation needle, etc., and also can be a biopsy needle. With the above sheath part, it can be easily switched as different diagnosis and treatment products, realizing single channel biopsy and ablation, avoiding the harm to patients caused by secondary puncture.

[0106] The ablation needle of the above embodiment is suitable for both cryoablation instruments and instruments based on heat conduction ablation. In addition, as a cryoablation instrument, it includes but is not limited to instruments based on Joule-Thomson principle, instruments based on liquid nitrogen delivery principle; as a heat conduction ablation instrument, it includes but is not limited to instruments based on water, water vapor, alcohol, alcohol vapor delivery principle.

[0107] In one embodiment, an ablation system is also provided, which includes: the ablation needle of any one of the above embodiments.

[0108] In the description of the present specification, the description of the terms "one embodiment", "one embodiment", "specific implementation process", "one example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0109] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An ablation needle, characterized in that, include: The ablation needle, the heat-insulating sheath, and the locking and positioning components; among which, The ablation needle includes: a needle shaft, a vacuum inner tube, and an air inlet tube, wherein the distal end of the needle shaft has a needle tip; The heat-insulating sheath is sleeved on the needle bar; the heat-insulating sheath and the needle bar are detachably connected; the locking and positioning component can controllably restrict the axial relative sliding between the needle bar and the heat-insulating sheath; The locking and positioning components include a first locking and positioning component and a second locking and positioning component. The first locking and positioning component includes a first positioning component and a first locking component. The second locking and positioning component includes a second positioning component and a second locking component. The distal end of the first positioning component is directly or indirectly connected to the heat-insulating sheath, and the proximal end of the first positioning component is fitted onto the second positioning component. The distal end of the first positioning component is the end of the first positioning component closest to the needle tip. The first locking component is fitted onto the first positioning component and can be controlled to lock the proximal end of the first positioning component to the second positioning component. The second positioning component is fitted onto the needle shaft, and the second locking component is fitted onto the proximal end of the second positioning component and can be controlled to lock the proximal end of the second positioning component to the needle shaft. The proximal end of the second positioning component is the end of the second positioning component furthest from the needle tip. There is a preset distance between the distal end of the needle bar and the distal end of the heat insulation sheath, and the area where the preset distance is located is the target area; the distal end of the heat insulation sheath is the end of the heat insulation sheath closer to the needle tip. The vacuum wall inner tube passes through the needle rod, and an interlayer is formed between the vacuum wall inner tube and the needle rod. The interlayer is an interlayer capable of forming a vacuum. The air inlet tube is inserted into the needle shaft, and the distal end of the air inlet tube extends into the target area. The distal end of the air inlet tube is the end of the air inlet tube closest to the needle tip.

2. The ablation needle according to claim 1, characterized in that, The heat-insulating sheath includes: an outer layer of sheath and an inner layer of sheath; The outer layer of the sheath is fitted over the inner layer of the sheath, and a sheath interlayer is formed between the outer layer and the inner layer of the sheath. The sheath interlayer is capable of forming a vacuum.

3. The ablation needle according to claim 2, characterized in that, The distal end face of the heat-insulating sheath is chamfered.

4. The ablation needle according to claim 1, characterized in that, Also includes: The handle portion includes a sheath connector, which is connected to the heat-insulating sheath.

5. The ablation needle according to claim 4, characterized in that, The handle portion further includes: a sealing assembly; The proximal end of the sheath connector extends beyond the proximal end of the heat-insulating sheath, and the proximal end of the needle bar extends beyond the proximal end of the heat-insulating sheath; the proximal end of the sheath connector is the end of the sheath connector furthest from the needle tip. The sealing assembly is used to isolate the inner and outer spaces of the handle portion.

6. The ablation needle according to claim 5, characterized in that, The sealing assembly includes: a sealing ring and a sealing ring pressing element, wherein... The sealing ring can be sleeved on the needle bar, and the sealing ring pressing member is pressed against the outer wall of the sealing ring.

7. The ablation needle according to claim 5, characterized in that, The handle also includes a suction port; The gap between the needle bar and the heat-insulating sheath forms a suction chamber; One end of the suction port is connected to the suction chamber.

8. The ablation needle according to any one of claims 1 to 7, characterized in that, The needle bar and the heat-insulating sheath can slide relative to each other along the axial direction of the needle bar to adjust the length of the target area.

9. The ablation needle according to claim 1, characterized in that, The direct or indirect connection between the first positioning element and the heat insulation sheath is fixed by a Luer joint.

10. The ablation needle according to claim 1, characterized in that, The proximal end of the first positioning member has a multi-claw structure. When the first locking member is locked in a controlled manner, it can force the multi-claw structure of the first positioning member to retract inward and grip the second positioning member. And / or, The proximal end of the second positioning member has a multi-claw structure. When the second locking member is locked in a controlled manner, it can force the multi-claw structure of the second positioning member to retract inward and grip the needle bar.

11. The ablation needle according to claim 1, characterized in that, The second positioning element is provided with a scale.

12. An ablation system, characterized in that, include: The ablation needle as described in any one of claims 1 to 11.

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