Curved adjustable cryoablation needle

Abstract

The present invention relates to a curved adjustable cryoablation needle, comprising an adjusting component and a fixing component, wherein the adjusting component can move relative to the fixing component to adjust the length of a target area: the fixing component comprises a needle rod, a rear-section thermal insulation tube, an air intake pipe and an air return pipe, wherein the rear-section thermal insulation tube is a curved tube, the rear end of the needle rod is fixedly connected to the front end of the rear-section thermal insulation tube, the needle rod is communicated with the rear-section thermal insulation tube to form a containing cavity; the air intake pipe and the air return pipe are both inserted into the containing cavity from the rear end of the rear-section thermal insulation tube; the adjusting component comprises a front-section thermal insulation tube and a core shaft, wherein the front-section thermal insulation tube is axially slidably arranged in the containing cavity to adjust the length of the target area; the air intake pipe passes through the front-section thermal insulation tube and extends into the needle rod; the core shaft is inserted from the rear end of the rear-section thermal insulation tube and fixedly connected to the front-section thermal insulation tube through an intermediate connecting tube, and the intermediate connecting tube can be bent and arranged in the rear-section thermal insulation tube, thereby solving the technical problems of the existing cryoablation needles that the treatment operation is complicated and the surrounding healthy tissues are easily damaged due to the fixing of the target area.

Description

Technical Field

[0001] The invention relates to a cryoablation needle, in particular to a curved adjustable cryoablation needle. Background Art

[0002] Cryoablation is a treatment method that uses low temperatures to destroy diseased tissues. It is considered to be an efficient and minimally invasive method for treating malignant tumors. Cryoablation technology is easy to operate, has few complications, and effectively relieves pain. In addition, the ice ball formed by ablation has clear boundaries and is easy to observe. It can safely ablate lesions near large blood vessels or important organs. Cryoablation can also use a multi-needle freezing method to expand the ablation range, which is suitable for large lesions and lesions with irregular shapes.

[0003] The target area (i.e., the effective freezing area) is located at the front section of the cryoablation needle, and its length determines the size of the freezing range. The longer the target area, the larger the ice ball formed by freezing. However, the target areas of existing cryoablation needles are mostly fixed structures, and the size of the ice ball they produce is also fixed. In clinical applications, doctors need to select cryoablation needles with different target area lengths according to the size of the lesion. For irregularly shaped lesions, it is necessary to use a variety of probes of different specifications, perform multiple treatment operations back and forth, and easily damage surrounding healthy tissues. For example, for "pear"-shaped tumors with a large head and a small tail, a single cryoablation needle with a long target area can be used in clinical practice at this stage for large-scale ablation, but this will damage more normal tissue in the middle of the "pear"; two cryoablation needles with short target areas can also be placed in front and behind to freeze for different times to achieve ablation, but this will increase the cost and difficulty of the operation. Summary of the invention

[0004] The purpose of the present invention is to provide a curved adjustable cryoablation needle to solve the technical problems of the existing cryoablation needles that the treatment operation is complicated and the surrounding healthy tissues are easily damaged due to the fixed target area.

[0005] In order to solve the above problems, the present invention provides a curved adjustable cryoablation needle, comprising an adjusting component and a fixing component, wherein the adjusting component can move relative to the fixing component to adjust the length of the target area:

[0006] The fixing component includes a needle rod, a rear heat insulation pipe, an air intake pipe and a return pipe. The rear heat insulation pipe is a curved pipe. The rear end of the needle rod is fixedly connected to the front end of the rear heat insulation pipe. The needle rod is in communication with the rear heat insulation pipe to form a receiving cavity. The air intake pipe and the return pipe are both inserted into the receiving cavity from the rear end of the rear heat insulation pipe.

[0007] The adjusting component includes a front section insulation tube and a core shaft, wherein the front section insulation tube is axially slidably arranged in the accommodating cavity to adjust the length of the target area; the air intake pipe passes through the front section insulation tube and extends into the needle rod; the core shaft is inserted from the rear end of the rear section insulation tube and is fixedly connected to the front section insulation tube through an intermediate connecting tube, and the intermediate connecting tube can be bent and arranged in the rear section insulation tube.

[0008] Preferably, the needle rod is outer-mounted on the front-section thermal insulation tube, and the outer wall of the front-section thermal insulation tube and the inner wall of the rear-section thermal insulation tube are dynamically sealed and connected via the front-end sealing assembly.

[0009] Preferably, the front end sealing assembly includes a front end sealing ring assembly and the intermediate connecting pipe, and the front end sealing ring assembly is arranged between the outer wall of the front section insulation pipe and the inner wall of the rear section insulation pipe; the front end of the intermediate connecting pipe is fixedly connected to and communicated with the front section insulation pipe, and the rear end is fixedly connected to the core shaft through a connecting pipe fixing piece.

[0010] Preferably, the front end sealing ring assembly includes a front end sealing ring baffle and a front end sealing ring, the front end sealing ring baffle is fixedly sleeved on the front end of the intermediate connecting pipe and / or the rear end of the front section insulation pipe, the front end sealing ring baffle is provided with a groove for accommodating the front end sealing ring, and the front end sealing ring is fixed in this groove.

[0011] Preferably, the inner diameter of the rear insulation tube is larger than the inner diameter of the needle rod.

[0012] Preferably, the air intake pipe member comprises a JT groove, a fin tube and an air intake pipe, the two ends of the fin tube are respectively fixedly connected to and communicated with the JT groove and the air intake pipe, and the fin tube is wound outside the core shaft;

[0013] The connecting pipe fixing piece is fixed to the rear end of the intermediate connecting pipe, and the connecting pipe fixing piece is provided with a return air hole communicating with the intermediate connecting pipe for circulating return air and guiding the JT groove to pass through, and a core shaft front end connecting hole for fixed connection with the front end of the core shaft.

[0014] Preferably, the fixing component further comprises a rear end sealing assembly, and the core shaft and the rear section thermal insulation pipe are dynamically sealedly connected via the rear end sealing assembly.

[0015] Preferably, the rear-end sealing ring assembly comprises two rear-end sealing ring baffles and a rear-end sealing ring, one of the rear-end sealing ring baffles is fixedly arranged on the inner wall of the rear-end heat-insulating pipe, the two rear-end sealing ring baffles cooperate to fix the rear-end sealing ring, and the core shaft passes through the rear-end sealing ring and is dynamically sealed and connected thereto;

[0016] The rear end sealing ring baffle is also provided with two outlet holes, and the air inlet pipe and the air return pipe are respectively fixed in one of the outlet holes.

[0017] Preferably, the rear end sealing assembly includes a rear end sealing ring assembly and an extension tube, the front end of the extension tube is fixedly connected to the rear end surface of the rear section insulation tube, the rear end sealing ring assembly is arranged at the rear end of the extension tube, and the core shaft passes through the extension tube and is dynamically sealed with the rear end sealing ring assembly.

[0018] Preferably, the rear end surface of the rear insulation pipe is further provided with two outlet holes, and the air inlet pipe and the air return pipe are respectively fixed in one of the outlet holes.

[0019] Preferably, the rear end sealing ring assembly includes two rear end sealing ring baffles and a rear end sealing ring, one of the rear end sealing ring baffles is fixed at the rear end of the extension tube, the two rear end sealing ring baffles cooperate to fix the rear end sealing ring, and the core shaft passes through the rear end sealing ring and is dynamically sealed therewith.

[0020] Preferably, the adjusting component also includes an adjusting sleeve, which is arranged outside the rear insulation tube, and a lever is fixed on the adjusting sleeve. A guide window and a core shaft rear end connecting hole are opened at the rear end of the adjusting sleeve, and the rear end of the core shaft passes through the core shaft rear end connecting hole and is fixedly connected to the core shaft rear end connecting hole.

[0021] Preferably, the fixing component also includes a handle, and the handle is fixedly sleeved on the needle rod and / or the rear insulation tube, and the adjustment sleeve is located in the gap between the handle and the rear insulation tube, and the handle is provided with an adjustment groove, and the lever extends from the adjustment groove.

[0022] Preferably, the fixing component also includes a rear end sealing assembly, which includes a rear end sealing ring assembly, the return air pipe is sleeved on the rear end of the handle, the air intake pipe is located in the return air pipe, and the rear section insulation pipe and the adjusting sleeve are dynamically sealed and connected via the rear end sealing ring assembly.

[0023] Preferably, the rear end sealing ring assembly includes two rear end sealing ring baffles and a rear end sealing ring, one of the rear end sealing ring baffles is fixedly disposed on the outer wall of the rear section insulation tube, the two rear end sealing ring baffles cooperate to fix the rear end sealing ring, and the rear end sealing ring contacts the inner wall of the adjusting sleeve and is dynamically sealed therewith.

[0024] Preferably, the fixing component also includes an electric wire assembly, which includes a temperature measuring wire and a wire lead-out tube, wherein the wire lead-out tube is fixed to the rear end of the rear insulation tube, and the temperature measuring wire passes through the front insulation tube, the middle connecting tube, the connecting tube fixing piece, the gap between the fin tube and the outside of the wire lead-out tube lead-out needle in sequence, and the temperature measuring point of the temperature measuring wire is located at the front section of the JT slot.

[0025] Preferably, glue is poured inside the wire lead-out tube, and the temperature measuring wire is sealed and connected to the wire lead-out tube via the glue.

[0026] Preferably, the adjusting component also includes a temperature measuring line, the core shaft is a hollow tube, the temperature measuring line passes through the front insulation tube, the middle connecting tube, the core shaft and leads out of the needle in sequence, and the temperature measuring point is located at the front end of the front insulation tube.

[0027] Preferably, glue is poured inside the core shaft, and the temperature measuring line is sealed and connected to the core shaft via the glue.

[0028] Preferably, the tube wall of the rear section heat-insulated tube is a double-layer vacuum wall, and the rear section heat-insulated tube comprises a rear section inner tube and a rear section outer tube, and a vacuum interlayer is formed between the rear section inner tube and the rear section outer tube.

[0029] Preferably, the tube wall of the front section heat-insulated tube is a double-layer vacuum wall, and the front section heat-insulated tube comprises a front section inner tube and a front section outer tube, and a vacuum interlayer is formed between the front section inner tube and the front section outer tube.

[0030] Preferably, the rear section heat insulation pipe comprises a first straight pipe, a curved pipe and a second straight pipe which are integrally connected, and the first straight pipe and the second straight pipe are respectively connected to the front and rear ends of the curved pipe;

[0031] The front section heat insulation pipe is axially slidably connected to the first straight pipe;

[0032] The intermediate connecting tube is a bendable tube. When the front section heat insulation tube moves axially along the first straight tube, the core shaft can be driven by the intermediate connecting tube to move axially in the second straight tube.

[0033] Preferably, the intermediate connecting pipe is a hypotube, a spiral grooved pipe or a corrugated pipe.

[0034] Compared with the prior art, the present invention has the following technical effects:

[0035] 1. The method of using the mandrel to link the front insulation tube to achieve the length adjustment of the target area solves the technical problems of the existing cryoablation needle, which causes complicated treatment operation and easy damage to surrounding healthy tissues due to the fixed target area;

[0036] 2. The needle rod and the rear insulation tube are firmly welded to prevent the needle rod from being ejected by high-pressure gas and to prevent low-temperature gas from leaking near the patient; the rear insulation tube is located at the position where the doctor's hand is supported, which can prevent frostbite and avoid loss of cold;

[0037] 3. The adjustment of the target area can be completed only from the rear of the needle, without separating the needle rod and the rear insulation tube. The needle rod and the rear insulation tube are firmly welded, which effectively prevents the needle rod from being ejected by high-pressure gas due to blockage of the return air channel.

[0038] 4. The front sealing component is placed inside the needle to prevent frostbite to the patient or doctor when the sealing ring fails;

[0039] 5. The rear sealing component is located at the rear of the needle and is used to prevent the return air flow from leaking out of the needle;

[0040] 6. The front sealing component is located inside the needle, and the rear sealing component is located behind the needle. Once a leak occurs, the cold air will only be discharged from a position away from the patient and the doctor's hands, ensuring the safety of the operation;

[0041] 7. During the adjustment of the target area, there is always an overlapping area between the front insulation tube and the rear insulation tube, which can prevent the cold from being released from the middle position of the insulation area.

[0042] 8. Considering the doctor's hand-holding comfort, the curved hand-held operation is more comfortable.

[0043] 9. The curved adjustable cryoablation needle is inserted under the guidance of CT to avoid interference between the extension tube behind the handle and the window when entering and exiting the CT scanning window. After the curved needle is inserted into the human body, the extension tube behind the handle is basically horizontal, and will not interfere with the window during CT scanning. Therefore, the curved adjustable cryoablation needle is more suitable for minimally invasive surgeries such as CT and MRI.

[0044] 10. The middle connecting tube is bendable in order to match the curved shape of the rear insulation tube. The front end of the middle connecting tube is fixedly connected to the front insulation tube, ensuring that during the adjustment of the target area, the middle connecting tube can be bent while providing forward thrust or backward pulling force to the front insulation tube.

[0045] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0047] Figure 1 This is a schematic diagram of a curved adjustable cryoablation needle of the present invention;

[0048] Figure 2 It is a structural schematic diagram of the adjusting component in the present invention;

[0049] Figure 3 AA is a cross-sectional view of the adjusting component in the present invention;

[0050] Figure 4 It is a structural schematic diagram of the front end sealing assembly in the present invention;

[0051] Figure 5 BB is a cross-sectional view of the front end sealing assembly of the present invention;

[0052] Figure 6 It is a structural schematic diagram of a curved adjustable cryoablation needle according to an embodiment of an external rear end sealing assembly of the present invention;

[0053] Figure 7 It is a structural schematic diagram of an embodiment of an external rear end sealing assembly in the present invention;

[0054] Figure 8 It is a cross-sectional view CC of an embodiment of an external rear end sealing assembly of the present invention;

[0055] Fig. 9 It is a structural schematic diagram of an embodiment of the shortest targeting area of ​​the curved adjustable cryoablation needle of the present invention;

[0056] Fig.10 It is a schematic structural diagram of an embodiment of the longest target area of ​​the curved adjustable cryoablation needle of the present invention;

[0057] Fig.11 It is a cross-sectional view DD of an embodiment of the longest target area of ​​the curved adjustable cryoablation needle in the present invention;

[0058] Fig.12 It is a partial structural schematic diagram of a curved adjustable cryoablation needle according to another embodiment of the external rear end sealing assembly of the present invention;

[0059] Fig.13 It is a structural schematic diagram of another embodiment of the external rear end sealing assembly in the present invention;

[0060] Fig.14is a cross-sectional view EE of another embodiment of the external rear end sealing assembly of the present invention;

[0061] Fig.15 It is a schematic diagram of the partial structure of a cryoablation needle with an adjustable targeting area according to the third embodiment of the external rear end sealing component of the present invention;

[0062] Fig.16 FF is a cross-sectional view of a curved adjustable cryoablation needle according to a third embodiment of an external rear end sealing assembly of the present invention;

[0063] Fig.17 It is a schematic diagram of an implementable structure for leading out a temperature measuring line from the gap between fin tubes in the present invention;

[0064] Fig.18 This is a schematic diagram of the structure of the temperature measuring line led out of the core shaft in the present invention;

[0065] Fig.19 The figure is a schematic diagram of the process of conformal ablation of a "pear" shaped tumor using an adjustable targeted area cryoablation needle in the present invention. DETAILED DESCRIPTION

[0066] The following will be combined Figures 1 to 19 The curved adjustable cryoablation needle provided by the present invention is described in detail. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. However, the protection scope of the present invention is not limited to the following embodiments. Those skilled in the art can modify and polish it without changing the spirit and content of the present invention.

[0067] Please refer to Figures 1 to 19 A curved adjustable cryoablation needle comprises an adjusting component 1 and a fixing component 2. The adjusting component 1 can move relative to the fixing component 2 to form a targeting area 3 and a heat-insulating area 4 with adjustable lengths on the outer surface of the ablation needle. In the present invention, the lengths of the targeting area 3 and the heat-insulating area 4 are both adjustable:

[0068] The fixing component 2 includes a needle rod 21, a rear heat-insulated tube 22, an air intake pipe 24 and an air return pipe 25. The rear heat-insulated tube 22 is a curved tube. The rear end of the needle rod 21 is fixedly connected to the front end of the rear heat-insulated tube 22. The needle rod 21 and the rear heat-insulated tube 22 are integrally connected to form a receiving cavity. The air intake pipe 24 and the air return pipe 25 are both inserted into the receiving cavity from the rear end of the rear heat-insulated tube 22.

[0069] The adjusting component 1 includes a front section thermal insulation tube 12 and a core shaft 11. The front section thermal insulation tube 12 is axially slidably arranged in the accommodating cavity to adjust the length of the target area 3; the air intake pipe 24 passes through the front section thermal insulation tube 12 and extends into the needle rod 21; the core shaft 11 is inserted from the rear end of the rear section thermal insulation tube 22 and is arranged in the rear section thermal insulation tube 22 through a bendable intermediate connecting tube 133, and the core shaft 11 is linked with the front section thermal insulation tube 12.

[0070] The present invention does not impose any specific restrictions on the bending shape of the rear section heat insulation tube 22, and the specific shape of this structure can be determined according to specific surgical requirements. For example, the front section of the rear section heat insulation tube 22 is a straight tube, the middle section is a curved tube, and the rear section is a straight tube; or the front section is a straight tube and the rear section is a curved tube; or the front section is a curved tube and the rear section is a straight tube; or the rear section heat insulation tube 22 is composed of at least one curved tube, as long as the needle rod 21 can be covered with the front section of the front section heat insulation tube 12 and slide axially with it, and the front section heat insulation tube 12 drives the core shaft 11 to move, the length of the target area 3 can be adjusted during the relative axial sliding process between the needle rod 21 and the front section heat insulation tube 12.

[0071] A specific embodiment is described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

[0072] Please refer to Figure 1 The rear heat-insulated pipe 22 includes a first straight pipe 223, a curved pipe 224 and a second straight pipe 225 which are integrally connected. The first straight pipe 223 and the second straight pipe 225 are respectively connected to the front and rear ends of the curved pipe 224;

[0073] The front section heat insulation tube 12 is sleeved inside the first straight tube 223 and is axially slidably connected to the first straight tube 223;

[0074] The intermediate connecting tube 133 is a bendable tube. When the front section heat insulation tube 12 moves axially along the first straight tube 223, the intermediate connecting tube 133 drives the core shaft 11 to move axially in the second straight tube 225. In the present invention, the intermediate connecting tube 133 is bendable and can be made of a bendable material with a certain flexibility, such as a flexible material; a bendable structure can also be adopted, such as the intermediate connecting tube 133 is a hypotube, a spiral grooved tube or a corrugated tube.

[0075] In this embodiment, the intermediate connecting tube 133 is preferably a sea wave tube, a spiral groove tube or a corrugated tube. The intermediate connecting tube 133 is characterized in that it is bendable and can provide thrust forward or pull backward.

[0076] The present invention does not limit the shape of the curved pipe 224 . In this embodiment, the curved pipe 224 is an arc-shaped pipe, the bending angle of the arc-shaped pipe is 90°, and the first straight pipe 223 is perpendicular to the second straight pipe 225 .

[0077] Please refer to Figures 3 to 5 The connecting tube fixing part 134 is fixed at the rear end of the intermediate connecting tube 133 and communicated therewith. The connecting tube fixing part 134 is provided with an air return hole 1341 communicated with the intermediate connecting tube 133 for circulating return air and guiding the air intake pipe 24 to pass through, and a core shaft front end connecting hole 1342 for fixedly connecting with the front end of the core shaft 11, that is, at least two air return holes 1341 are opened on the connecting tube fixing part 134, one is used for communicating with the air return pipe 25, and the other is for the air intake pipe 24 to pass through. The air intake pipe 24 passes through one air return hole 1341 and passes through the intermediate connecting tube 133 and the front section insulation tube 12 to the needle rod 21 in sequence.

[0078] In the present embodiment, the needle rod 21 is sleeved on the front insulation tube 12, and the needle rod 21 and the front insulation tube 12 are both straight tubes. The outer wall of the front insulation tube 12 and the inner wall of the first straight tube 223 are dynamically sealed by the front sealing assembly 13. The area formed on the outer surface of the ablation needle between the front end face of the front insulation tube 12 and the front end of the needle tip of the needle rod 21 is the targeting area 3, which is an effective freezing area. The area formed on the outer surface of the ablation needle between the front end of the front insulation tube 12 and the rear end of the rear insulation tube 22 is the insulation area 4, which can prevent frostbite of normal tissue. In the present embodiment, the core shaft 11, the front insulation tube 12 and the front sealing assembly 13 are integrated and move back and forth as a piston to adjust the length of the targeting area 3 and the insulation area 4.

[0079] In this embodiment, the front end of the front insulation tube 12 extends into the needle rod 21, and the rear end extends into the first straight tube 223. The front insulation tube 12 is used to insulate the rear section of the needle rod 21. The front sealing assembly 13 is an axial piston sealing structure, which is used to prevent the return air flow from passing through the gap between the needle rod 21 and the front insulation tube 12. The needle rod 21 and the first straight tube 223 can be welded or integrally formed in the axial direction. The present invention does not impose specific restrictions on this. The purpose is to prevent the needle rod 21 from being ejected by high-pressure gas and to prevent low-temperature gas from leaking near the patient. The rear insulation tube 22 is located at the position where the doctor's hand supports, which can prevent frostbite and avoid cold loss.

[0080] The fixing component 2 further comprises a rear end sealing component 23, which is also an axial piston sealing structure. The rear end sealing component 23 is used to prevent the return air flow from leaking out of the needle.

[0081] The air intake pipe 24 is inserted from the rear end of the second straight tube 225 and extends to the front end of the needle rod 21, and is used to transport and throttle the high-pressure gas to the target area 3. The throttled gas releases cold energy in the target area 3 and then is discharged from the needle through the front insulation tube 12 and the return air pipe 25. Specifically, the air intake pipe 24 includes a JT groove 241, a fin tube 242 and an air intake pipe 243. The two ends of the fin tube 242 are respectively welded and connected to the JT groove 241 and the air intake pipe 243. The fin tube 242 is wound outside the core shaft 11 with a certain pitch. The JT groove 241 passes through the return air hole 1331, so that the adjustment component 1 will not affect the position of the air intake pipe 24 during the adjustment process.

[0082] In this embodiment, during the adjustment of the target area 3 , there is always an overlapping area between the front insulation tube 12 and the first straight tube 223 , so that the cold energy can be prevented from being released from the middle position of the insulation area 4 .

[0083] In this embodiment, the front sealing component 13 is located inside the needle, and the rear sealing component 23 is located at the rear end of the needle. Once a leak occurs, the cold air will only be discharged from a position away from the patient and the doctor's hands, ensuring the safety of the operation.

[0084] For the cryoablation needle in which the return air pipe 25 and the inlet air pipe 243 are inserted side by side into the rear insulation tube 22, the rear end sealing assembly 23 is used for piston sealing between the core shaft 11 and the inner wall of the rear insulation tube 22. The rear end sealing assembly 23 can be placed outside the rear insulation tube 22 or built into the rear insulation tube 22.

[0085] For the cryoablation needle with the return air pipe 25 externally mounted on the air inlet pipe 243 , the rear end sealing assembly 23 is used for piston sealing between the rear insulation pipe 22 and the regulating sleeve 14 , and the rear end sealing assembly 23 is externally mounted on the rear end of the rear insulation pipe 22 .

[0086] Several specific embodiments are described in detail below with reference to the accompanying drawings.

[0087] Example 1

[0088] Please refer to Figure 3 The tube wall of the front section heat-insulated tube 12 can be made of heat-insulating material or a double-layer vacuum wall. The present invention does not make any specific limitations. The present embodiment preferably uses a double-layer vacuum wall, that is, the front section heat-insulated tube 12 includes a front section inner tube 122 and a front section outer tube 121, and a vacuum interlayer is formed between the front section inner tube 122 and the front section outer tube 121.

[0089] As an embodiment, the two ends of the front section outer tube 121 are narrowed and vacuum welded with the front section inner tube 122 to form a permanent vacuum interlayer;

[0090] As another embodiment, both ends of the front section inner tube 122 are expanded and vacuum welded with the front section outer tube 121 to form a permanent vacuum interlayer;

[0091] As a third embodiment, the two ends of the front section inner tube 122 are flush with the two ends of the front section outer tube 121, and a permanent vacuum interlayer is formed therebetween.

[0092] Please refer to Figure 4 and Figure 5 The front sealing assembly 13 includes a front sealing ring 131 and an intermediate connecting pipe 133. The front end of the intermediate connecting pipe 133 is inserted into the front insulation pipe 12 and welded, and the rear end is fixedly connected to the core shaft 11 through a connecting pipe fixing member 134. The specific setting structure of the front sealing ring 131 is not limited in this embodiment:

[0093] As an embodiment, an annular groove is provided at the front end of the intermediate connecting pipe 133 or the rear end of the front insulation pipe 12, and the front sealing ring 131 is embedded in the annular groove;

[0094] As another embodiment, the front sealing ring 131 is fixedly sleeved on the front end of the intermediate connecting pipe 133 or / and the rear end of the front section heat insulation pipe 12 through a front sealing ring baffle, and the front sealing ring baffle is provided with a groove for accommodating the front sealing ring 131, and the front sealing ring is fixedly arranged in the groove. Specifically, two front sealing ring baffles 132 are fixedly arranged at the front end of the intermediate connecting pipe 133, and the two front sealing ring baffles 132 are arranged at intervals, and the front sealing ring 131 is embedded between the two front sealing ring baffles 132. The two front end sealing ring baffles 132 can be made in one piece, and an outer groove for fixing the front end sealing ring 131 is formed therebetween; alternatively, a front end sealing ring baffle 132 is welded to the outer wall of the middle connecting pipe 133, and the two front end sealing ring baffles 132 can be connected by threaded fastening, and an outer groove is formed between the two front end sealing ring baffles 132, and the front end sealing ring 131 is fixedly embedded in this outer groove. The purpose of the detachable connection of the two front end sealing ring baffles 132 is to facilitate the replacement of the front end sealing ring 131.

[0095] The inner diameter of the first straight tube 223 is larger than the inner diameter of the needle rod 21. The front insulation tube 12 is always located in the first straight tube 223 due to the obstruction of the front end sealing component 13 and will not enter the needle rod 21. The purpose is that during the adjustment process of the target area 3, there is always an overlapping area between the front insulation tube 12 and the first straight tube 223, and there will be no separation between the two, thereby preventing the cold from being released from the middle position of the insulation area 4.

[0096] In this embodiment, the mandrel 11 is a solid bar.

[0097] In this embodiment, the core shaft 11 and the second straight pipe 225 are dynamically sealed via the rear end sealing assembly 23 .

[0098] The tube wall of the rear section heat insulation tube 22 can be made of heat insulation material or double-layer vacuum wall, which is not specifically limited in the present invention. In this embodiment, the double-layer vacuum wall is preferred, that is, the tube wall of the rear section heat insulation tube 22 is a double-layer vacuum wall, and the rear section heat insulation tube 22 includes a rear section inner tube 222 and a rear section outer tube 221, and a vacuum sandwich is formed between the rear section inner tube 222 and the rear section outer tube 221. The two ends of the rear section outer tube 221 are contracted and vacuum welded with the rear section inner tube 222 to form a permanent vacuum sandwich; or, the two ends of the rear section inner tube 222 are expanded and vacuum welded with the rear section outer tube 221 to form a permanent vacuum sandwich.

[0099] In this embodiment, the return air pipe 25 and the intake air pipe 243 are inserted side by side into the rear end of the second straight pipe 225, and the rear end sealing assembly 23 is used for piston sealing between the core shaft 11 and the inner wall of the second straight pipe 225. The rear end sealing assembly 23 can be placed outside the second straight pipe 225, or can be placed inside the second straight pipe 225:

[0100] Please refer to Figures 6 to 11 As an embodiment, the rear end sealing assembly 23 is externally disposed on the rear section inner tube 222, and the rear end of the rear section outer tube 221 is narrowed and vacuum welded to the rear section inner tube 222. The rear end sealing assembly 23 includes a rear end sealing ring assembly and an extension tube 233. The purpose of the extension tube 233 is to extend the position of the rear end sealing ring assembly backward to avoid interference between the rear end sealing assembly 23 and the intake pipe 243 and the return pipe 25. In this embodiment, the front end of the extension tube 233 is welded to the rear section inner tube 222, the rear end sealing ring assembly is arranged at the rear end of the extension tube 233, and the core shaft 11 passes through the extension tube 233 and is dynamically sealed and connected to the rear end sealing ring assembly. The rear end sealing ring assembly includes two rear end sealing ring baffles 232 and a rear end sealing ring 231. One rear end sealing ring baffle 232 is fixed on the extension tube 233. The two rear end sealing ring baffles 232 can be connected by threaded fastening. An inner groove is formed between the two rear end sealing ring baffles 232. The rear end sealing ring 231 is fixedly embedded in the inner groove. The purpose of the detachable connection of the two rear end sealing ring baffles 232 is to facilitate the replacement of the rear end sealing ring 231. In this embodiment, the rear end sealing ring 231 contacts the outer wall of the core shaft 11, and the core shaft 11 is dynamically sealed with the rear end sealing ring 231.

[0101] In this embodiment, the air intake pipe 243, the air return pipe 25 and the extension pipe 233 are all inserted into the rear end of the second straight pipe 225, and the outer walls of the air intake pipe 243, the air return pipe 25 and the extension pipe 233 are sealed with the rear inner pipe 222 by seamless welding:

[0102] As an embodiment, the second straight pipe 225 has a rear end wall, and three insertion holes are provided in the rear end wall for the air intake pipe 243, the air return pipe 25 and the extension pipe 233 to be inserted. The air intake pipe 243, the air return pipe 25 and the extension pipe 233 are seamlessly welded in one insertion hole.

[0103] As another embodiment, there is no need to set a rear end wall at the rear end of the second straight pipe 225. At the rear end of the second straight pipe 225, the outer walls of the air inlet pipe 243, the air return pipe 25 and the extension pipe 233 and the inner wall of the second straight pipe 225 are directly fixed by seamless welding, that is, the gap between the outer walls of the air inlet pipe 243, the air return pipe 25 and the extension pipe 233 and the inner wall of the second straight pipe 225 is filled with solder.

[0104] The structure in which the air inlet pipe 243 and the air return pipe 25 are placed side by side and welded and sealed at the rear end of the rear insulation pipe 22 is suitable for cryoablation needles with relatively low return air temperature.

[0105] Please refer to Figure 12 to Figure 14 As another embodiment, the rear end sealing assembly 23 is a rear end sealing ring assembly, which is built into the rear end (i.e., the second straight tube 225) of the rear end insulation tube 22, and the mandrel 11 passes through the rear end sealing ring assembly and is dynamically sealed with the rear end sealing ring assembly. In this embodiment, the rear end of the rear end inner tube 222 of the rear end insulation tube 22 is expanded and vacuum welded with the rear end outer tube 221, and the rear end of the rear end inner tube 222 is expanded and welded with the rear end outer tube 221 and continues to extend backward to ensure that the rear end of the rear end inner tube 222 has enough space to accommodate the rear end sealing ring 231 and the rear end sealing ring baffle 232. In this embodiment, the rear end sealing assembly 23 includes two rear end sealing ring baffles 232 and a rear end sealing ring 231. A rear end sealing ring baffle 232 is welded to the flared end of the rear section inner tube 222. The two rear end sealing ring baffles 232 are threadedly matched to fix the rear end sealing ring 231. The two rear end sealing ring baffles 232 can be connected by threaded fastening. An inner groove is formed between the two rear end sealing ring baffles 232. The rear end sealing ring 231 is fixedly embedded in this inner groove. The core shaft 11 passes through the rear end sealing ring 231 and is dynamically sealed therewith.

[0106] In this embodiment, the rear end sealing assembly 23 is inserted into the rear end expansion opening of the rear end inner tube 222 and welded. This structure helps to reduce the length of the handle 26.

[0107] In this embodiment, two outlet holes 2321 are opened on the rear end sealing ring baffle 232 , and the air inlet pipe 243 and the air return pipe 25 are respectively welded in one of the outlet holes 2321 .

[0108] In the present invention, the adjusting component 1 can be directly operated manually to make it move relative to the fixing component 2, or the adjusting component 1 can be indirectly operated by adjusting the lever. The present invention does not make any specific restrictions on this. This embodiment takes the second implementation as an example to explain in detail. The specific structure is as follows:

[0109] The adjusting component 1 also includes an adjusting sleeve 14, which is placed on the rear insulation tube 22. In this embodiment, the rear end face of the adjusting sleeve 14 is located behind the second straight tube 225. A lever 143 is provided on the side wall of the adjusting sleeve 14. A guide window 141 and a mandrel rear end connection hole 142 are provided on the rear end face of the adjusting sleeve 14 for the air inlet pipe 243 and the air return pipe 25 to pass through. The mandrel 11 passes through the mandrel rear end connection hole 142 and is fixedly connected to the mandrel rear end connection hole 142. The fixed connection method can be welding or threaded connection. The lever 143 is used to manually move the adjusting component 1 forward or backward to adjust the length of the target area 3.

[0110] In this embodiment, the fixing component 2 further comprises a handle 26, which is fixedly sleeved on the needle rod 21 or / and the rear heat insulation tube 22, and the adjusting sleeve 14 is located in the gap between the handle 26 and the rear heat insulation tube 22. The side of the handle 26 is provided with an adjusting groove 261, and the lever 143 extends from the adjusting groove 261, so as to facilitate manual manipulation. The handle 26 does not bear any pressure from the inside of the needle.

[0111] During the adjustment process of the target area 3, the lever 143 is manually moved forward and backward to drive the entire adjustment component 1 to perform piston movement. Since the JT groove 241 and the core shaft 11 have a certain degree of flexibility, they will not be unable to adjust due to the problem of non-concentricity with the needle. Figure 8 As shown, the air inlet pipe 243 and the air return pipe 25 pass through the guide window 141, ensuring that the air inlet pipe 243 and the air return pipe 25 in the fixed position will not cause obstruction to the adjustment component during the adjustment process. When the adjustment is to the shortest target area 3, the entire adjustment component is located most forward relative to the fixed component 2, the target area 3 formed is the shortest, and the ice ball generated by the corresponding freezing is also the smallest; when the adjustment is to the longest target area 3, the entire adjustment component is located most backward relative to the fixed component 2, the target area 3 formed is the longest, and the ice ball generated by the corresponding freezing is the largest.

[0112] Example 2

[0113] Please refer to Fig.15 and Fig.16 When the return air temperature of the cryoablation needle is not too low, the return air tube 25 can be placed outside the air inlet tube 243. Fig.11 The rear structure of the adjustable targeting zone 3 of this type of cryoablation needle, the structure not shown in the figure is similar to Fig. 9 , Fig.10 The rear end of the rear inner tube 222 of the structure is in an open state, and the air inlet pipe 243 only needs to be fixedly connected to the rear inner tube 222. The return air pipe 25 is sleeved on the rear part of the handle 26, and the air inlet pipe 243 is located inside the return air pipe 25. The rear end sealing assembly 23 of the structure is a rear end sealing ring assembly, which is fixed to the rear end outside of the rear end of the rear insulation tube 22, and the rear insulation tube 22 and the adjusting sleeve 14 are dynamically sealed through the rear end sealing ring assembly.

[0114] Further, the rear end sealing ring assembly includes two rear end sealing ring baffles 232 and a rear end sealing ring 231, one of the rear end sealing ring baffles 232 is fixedly arranged on the outer wall of the rear end heat insulation tube 22, and the two rear end sealing ring baffles 232 cooperate to fix the rear end sealing ring 231 (the two rear end sealing ring baffles 232 can be connected by threaded fastening, and an outer groove is formed between the two rear end sealing ring baffles 232, and the rear end sealing ring 231 is fixedly embedded in this outer groove), and the rear end sealing ring 231 contacts the inner wall of the regulating sleeve 14 and is dynamically sealed therewith. The rear end sealing ring 231 contacts the inner side of the regulating sleeve 14 to prevent the return air from escaping forward from the gap between the regulating sleeve 14 and the rear end heat insulation tube 22. In this embodiment, the rear end face of the regulating sleeve 14 is located behind the rear section heat insulation tube 22. The rear end face of the regulating sleeve 14 of this structure also includes a guide window 141 and a mandrel rear end connection hole 142. The mandrel 11 is fixed in the mandrel rear end connection hole 142, and the air inlet pipe 243 passes through the guide window 141. In addition, since the return air temperature of this type of cryoablation needle is not too low, this solution can be a single-layer tube wall, that is, only the rear section inner tube 222 is retained, and the rear section outer tube 221 is removed. The heat preservation of the handle 26 section is achieved only by the gap between the regulating sleeve 14 and the rear section inner tube 222.

[0115] Example 3

[0116] In order to monitor the working status of the cryoablation needle and the central temperature of the freezing area in real time, the cryoablation needle needs to have a real-time temperature measurement function inside the target area. Fig.17As shown, the lead-out method of the temperature measuring wire 271 can be led out through the gap of the fin tube 242. The fixed component 22 of this scheme also includes a wire assembly 27, and the wire assembly 27 includes a temperature measuring wire 271 and a wire lead-out tube 272. The temperature measuring point 2711 of the temperature measuring wire 271 is placed at the front end of the JT groove 241. The temperature measuring wire 271 passes through the interior of the front inner tube 122, the middle connecting tube 133, the connecting tube fixing part 134, the gap of the fin tube 242 (the fin tube 242 is wound on the core shaft 11 with a certain pitch, and the temperature measuring wire 271 does not penetrate into the tube of the fin tube 242, but passes through the cylinder wound by the spiral fin tube 242) and the wire lead-out tube 272 to lead out of the needle, wherein the wire lead-out tube 272 is filled with glue to ensure that when the temperature measuring wire 271 is led out, the gas in the needle will not leak to the outside of the needle through the wire lead-out tube 272. The wire lead-out tube 272 is welded to the rear end face of the rear inner tube 222 together with the air inlet tube 243, the air return tube 25 and the rear end sealing assembly 23, and the four (wire lead-out tube 272, air inlet tube 243, air return tube 25 and rear end sealing assembly 23) are isolated and sealed from each other (the purpose is to prevent the return air from escaping forward from the rear end face of the rear inner tube 222), and the wire lead-out tube 272 passes through the guide window 141 together with the air inlet tube 243 and the air return tube 25. The structure of this scheme is more complicated, but the position of the temperature measuring point 2711 is fixed and does not change with the adjustment of the target area. The lead-out method of the rewarming line for realizing the rewarming function of the cryoablation needle is consistent with the lead-out method of the temperature measuring line 271.

[0117] Example 4

[0118] The temperature measuring wire 271 can also be led out of the needle through the core shaft 11, such as Fig.18 As shown, the wire assembly 27 of this scheme only includes a temperature measuring wire 271, which is part of the adjustment component 1. The core shaft 11 of this scheme is a hollow tube, and the temperature measuring point 2711 of the temperature measuring wire 271 is placed at the front end of the front inner tube 122. The temperature measuring wire 271 passes through the inside of the front inner tube 12, the inside of the intermediate connecting tube 133 and the core shaft 11 to lead out of the needle. The inside of the core shaft 11 is filled with glue to prevent gas leakage in the needle. The structure of this scheme is simple, but the temperature measuring point 2711 will change with the adjustment of the target area. The longer the length of the target area, the greater the difference between the temperature of the temperature measuring point 2711 and the center temperature of the target area 3. The lead-out method of the rewarming wire that realizes the rewarming function of the cryoablation needle is consistent with the lead-out method of the temperature measuring wire 271.

[0119] Example 5

[0120] For tumors that are approximately spherical or ellipsoidal, the appropriate length of the targeted area can be selected for cryoablation according to their size. However, in actual clinical practice, the shape of tumors is often irregular, such as a "pear"-shaped tumor with a large head and a small tail. For "pear"-shaped tumors, a single cryoablation needle with a long targeted area can be used in clinical practice for large-scale ablation, which will damage more normal tissue in the middle of the "pear". Two cryoablation needles with short targeted areas can also be placed in front and behind to freeze for different periods of time to achieve ablation, but this will increase the cost and difficulty of the operation. If a curved adjustable cryoablation needle is used, precise conformal ablation with a single needle can be achieved. Fig.19 An example of a process for achieving cryoablation of a "pear"-shaped tumor using the shortest and longest target areas: insert the needle from the tail end of the "pear"-shaped tumor 5 (the range shown by the thin dotted line) until the needle tip reaches the head end of the tumor, adjust the target area to the shortest length, start freezing for a period of time, and the ice ball 6 (the range shown by the thick solid line) will initially freeze the head end of the tumor. Then adjust the target area to the maximum length, continue freezing, and the ice ball 6 will freeze the head and tail ends of the tumor at the same time, and finally the shape of the ice ball 6 will conform to the "pear"-shaped tumor 5.

[0121] The above disclosure is only a specific embodiment of the present application, but the present application is not limited thereto, and any changes that can be conceived by technicians in this field should fall within the protection scope of the present application.

Claims

1. A curved adjustable cryoablation needle, characterized in that: The invention comprises an adjusting component (1) and a fixing component (2), wherein the adjusting component (1) can move relative to the fixing component (2) to adjust the length of a target area (3); the fixing component (2) comprises a needle rod (21), a rear section heat insulation pipe (22), an air intake pipe (24) and an air return pipe (25); the rear section heat insulation pipe (22) is a curved pipe; the rear end of the needle rod (21) is fixedly connected to the front end of the rear section heat insulation pipe (22); the needle rod (21) is in communication with the rear section heat insulation pipe (22) to form a receiving cavity; the air intake pipe (24) and the air return pipe (25) are both connected to the rear section heat insulation pipe (22) and the air return pipe (25) is ... intake pipe (24) and the air return pipe (25) are connected to the rear section heat insulation pipe (22) and the air return pipe (25) is connected to the rear section heat insulation pipe (22) and the air return pipe (25) is connected to the rear section heat insulation pipe (22) and the air return pipe (25) is connected to the rear section heat insulation pipe (22) and the air return pipe (25) is connected to the rear section heat insulation pipe (22) and the air return pipe ( The rear end of the tube (22) is inserted into the accommodating cavity; the adjusting component (1) comprises a front section heat insulation tube (12) and a core shaft (11), the front section heat insulation tube (12) is axially slidably arranged in the accommodating cavity to adjust the length of the target area (3); the air intake pipe (24) passes through the front section heat insulation tube (12) and extends into the needle rod (21); the core shaft (11) is inserted from the rear end of the rear section heat insulation tube (22) and is fixedly connected to the front section heat insulation tube (12) through an intermediate connecting tube (133), and the intermediate connecting tube (133) is bendably arranged in the rear section heat insulation tube (22); The needle rod (21) is sleeved on the front section heat insulation tube (12), and the outer wall of the front section heat insulation tube (12) and the inner wall of the rear section heat insulation tube (22) are dynamically sealed and connected via the front end sealing assembly (13); The front end sealing assembly (13) comprises a front end sealing ring assembly and the intermediate connecting pipe (133), wherein the front end sealing ring assembly is arranged between the outer wall of the front section heat insulation pipe (12) and the inner wall of the rear section heat insulation pipe (22); the front end of the intermediate connecting pipe (133) is fixedly connected to and communicates with the front section heat insulation pipe (12), and the rear end is fixedly connected to the core shaft (11) via a connecting pipe fixing piece (134); The front end sealing ring assembly comprises a front end sealing ring baffle and a front end sealing ring, wherein the front end sealing ring baffle is fixedly sleeved on the front end of the intermediate connecting pipe (133) and / or the rear end of the front section heat insulation pipe (12), and the front end sealing ring baffle is provided with a groove for accommodating the front end sealing ring, and the front end sealing ring is fixedly arranged in the groove; The fixed component (2) further comprises a rear end sealing assembly (23), and the core shaft (11) and the rear section heat insulation pipe (22) are dynamically sealedly connected via the rear end sealing assembly (23); The rear end sealing assembly (23) comprises two rear end sealing ring baffles (232) and a rear end sealing ring (231); one of the rear end sealing ring baffles (232) is fixedly arranged on the inner wall of the rear section heat insulation pipe (22); the two rear end sealing ring baffles (232) cooperate to fix the rear end sealing ring (231); the core shaft (11) passes through the rear end sealing ring (231) and is dynamically sealed therewith; two outlet holes (2321) are also provided on the rear end sealing ring baffle (232); the air inlet pipe (243) and the air return pipe (25) are respectively fixed in one of the outlet holes (2321); The rear end sealing assembly (23) comprises a rear end sealing ring assembly and an extension tube (233); the front end of the extension tube (233) is fixedly connected to the rear end surface of the rear section heat insulation tube (22); the rear end sealing ring assembly is arranged at the rear end of the extension tube (233); the core shaft (11) passes through the extension tube (233) and is dynamically sealed to the rear end sealing ring assembly; The rear end surface of the rear insulation pipe (22) is also provided with two outlet holes (2321), and the air inlet pipe (243) and the air return pipe (25) are respectively fixed in one of the outlet holes (2321); The rear end sealing ring assembly comprises two rear end sealing ring baffles (232) and a rear end sealing ring (231), one of the rear end sealing ring baffles (232) being fixedly arranged at the rear end of the extension tube (233), the two rear end sealing ring baffles (232) cooperating to fix the rear end sealing ring (231), and the core shaft (11) passing through the rear end sealing ring (231) and being dynamically sealed therewith; The adjusting component (1) further comprises an adjusting sleeve (14), the adjusting sleeve (14) being arranged on the outer surface of the rear heat insulation tube (22), a lever (143) being fixedly arranged on the adjusting sleeve (14), a guide window (141) and a core shaft rear end connecting hole (142) being provided at the rear end of the adjusting sleeve (14), and a rear end of the core shaft (11) passing through the core shaft rear end connecting hole (142) and being fixedly connected to the core shaft rear end connecting hole (142).

2. The adjustable curved cryoablation needle according to claim 1, characterized in that: The inner diameter of the rear heat insulation tube (22) is greater than the inner diameter of the needle rod (21).

3. The adjustable curved cryoablation needle according to claim 1, characterized in that: The air intake pipe member (24) comprises a JT groove (241), a fin tube (242) and an air intake pipe (243); the two ends of the fin tube (242) are respectively fixedly connected to and communicated with the JT groove (241) and the air intake pipe (243); the fin tube (242) is wound around the outside of the core shaft (11); the connecting pipe fixing member (134) is fixed to the rear end of the intermediate connecting pipe (133); the connecting pipe fixing member (134) is provided with an air return hole (1341) which is in communication with the intermediate connecting pipe (133) and is used for circulating return air and guiding the JT groove (241) to pass through, and a core shaft front end connecting hole (1342) which is fixedly connected to the front end of the core shaft (11).

4. The adjustable curved cryoablation needle according to claim 1, characterized in that: The fixing component (2) further comprises a handle (26), wherein the handle (26) is fixedly sleeved on the needle rod (21) and / or the rear section heat insulation tube (22), the adjusting sleeve (14) is located in the gap between the handle (26) and the rear section heat insulation tube (22), and the handle (26) is provided with an adjusting groove (261), and the shifting rod (143) extends from the adjusting groove (261).

5. The adjustable curved cryoablation needle according to claim 4, characterized in that: The fixing component (2) further comprises a rear end sealing assembly (23), wherein the rear end sealing assembly (23) comprises a rear end sealing ring assembly, the return air pipe (25) is sleeved on the rear end of the handle (26), the intake air pipe (243) is located in the return air pipe (25), and the rear section heat insulation pipe (22) and the regulating sleeve (14) are dynamically sealed and connected via the rear end sealing ring assembly.

6. The adjustable curved cryoablation needle according to claim 5, characterized in that: The rear end sealing ring assembly comprises two rear end sealing ring baffles (232) and a rear end sealing ring (231); one of the rear end sealing ring baffles (232) is fixedly arranged on the outer wall of the rear section heat insulation pipe (22); the two rear end sealing ring baffles (232) cooperate to fix the rear end sealing ring (231); the rear end sealing ring (231) contacts the inner wall of the adjusting sleeve (14) and is dynamically sealed therewith.

7. The adjustable curved cryoablation needle according to claim 3, characterized in that: The fixing component (2) also includes a wire assembly (27), the wire assembly (27) including a temperature measuring wire (271) and a wire lead-out tube (272), the wire lead-out tube (272) being fixed to the rear end of the rear insulation tube (22), the temperature measuring wire (271) sequentially passing through the front insulation tube (12), the middle connecting tube (133), the connecting tube fixing member (134), the gap between the fin tube (242) and the lead-out needle of the wire lead-out tube (272), and the temperature measuring point (2711) of the temperature measuring wire (271) is located at the front end of the JT groove (241).

8. The adjustable curved cryoablation needle according to claim 3, characterized in that: The regulating component (1) further comprises a temperature measuring line (271); the core shaft (11) is a hollow tube; the temperature measuring line (271) sequentially passes through the front section heat insulation tube (12), the middle connecting tube (133), and the core shaft (11) and is led out of the needle; the temperature measuring point (2711) is located at the front end of the front section heat insulation tube (12).

9. The adjustable bend cryoablation needle according to any one of claims 1 to 8, characterized in that: The rear section heat-insulating tube (22) comprises a first straight tube (223), a curved tube (224) and a second straight tube (225) which are integrally connected, and the first straight tube (223) and the second straight tube (225) are respectively connected to the front and rear ends of the curved tube (224); the front section heat-insulating tube (12) is axially slidably connected to the first straight tube (223); the intermediate connecting tube (133) is a bendable tube, and when the front section heat-insulating tube (12) moves axially along the first straight tube (223), the core shaft (11) can be driven by the intermediate connecting tube (133) to move axially in the second straight tube (225).

10. The adjustable curved cryoablation needle according to claim 9, characterized in that: The intermediate connecting pipe (133) is a hypotube, a spiral grooved pipe or a corrugated pipe.

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