A 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 an insulation tube and an air return tube, wherein the insulation tube is a curved tube, and the air return tube is inserted from the rear end of the insulation tube and fixedly connected thereto; the adjusting component comprises a needle rod and an air intake pipe fitting, wherein the needle rod is sleeved on the front section of the insulation tube and is axially slidably connected thereto; the air intake pipe fitting is inserted from the rear end of the insulation tube and extends into the needle rod, wherein the air intake pipe fitting is fixedly connected to the needle rod, and the needle rod is linked to the air intake pipe fitting to adjust the length of the target area, thereby solving the technical problems of existing cryoablation needles that are complicated in treatment operation and easy to damage surrounding healthy tissues due to the fixation 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] 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 a target area:

[0006] The fixing component includes a heat insulation pipe and a return air pipe, wherein the heat insulation pipe is a curved pipe, and the return air pipe is inserted from the rear end of the heat insulation pipe and fixedly connected thereto;

[0007] The adjusting component includes a needle rod and an air intake pipe fitting, wherein the needle rod is sleeved on the front section of the heat insulation tube and is axially slidably connected thereto; the air intake pipe fitting is inserted from the rear end of the heat insulation tube and extends into the needle rod, and the air intake pipe fitting is fixedly connected to the needle rod, and the needle rod is linked to the air intake pipe fitting to adjust the length of the target area.

[0008] Preferably, a countersunk hole is provided in the needle tip of the needle rod, the countersunk hole is communicated with the interior of the needle rod, and the front end of the air intake pipe is fixed in the countersunk hole; a plurality of throttling holes are provided on the air intake pipe, and the plurality of throttling holes are always located in front of the heat insulation pipe; or,

[0009] The outer wall of the air intake pipe is fixed on the inner wall of the needle rod, and a throttling hole is arranged at the front end of the air intake pipe.

[0010] Preferably, the needle rod is covered on the front section of the heat insulation tube through a sealing member and is axially slidably connected thereto;

[0011] The air intake pipe is retractable, and both the air intake pipe and the air return pipe are inserted from the rear end of the heat insulation pipe. The outer walls of the air intake pipe and the air return pipe are fixedly connected to the rear end of the heat insulation pipe without a gap.

[0012] Preferably, the sealing member comprises a sealing ring, a groove for accommodating the sealing ring is provided on the front section of the needle rod or the heat-insulating tube, and the sealing ring is dynamically sealed and arranged between the needle rod and the front section of the heat-insulating tube; or,

[0013] The sealing member comprises a sealing ring and a sealing ring baffle, wherein the sealing ring baffle is fixedly mounted on the front section of the needle rod or the insulation tube, and a groove for accommodating the sealing ring is arranged on the sealing ring baffle, and the sealing ring is dynamically sealed and arranged between the needle rod and the front section of the insulation tube.

[0014] Preferably, the sealing ring baffle includes a front baffle and a rear baffle, the front baffle is sleeved on the rear end of the needle rod, the rear baffle is threadedly fixed to the front baffle, a groove facing the front section of the insulation tube is formed between the front baffle and the rear baffle, and the sealing ring is embedded in the groove.

[0015] Preferably, at least one section of the air inlet pipe is a spring structure, and the spring structure can be stretched or compressed as the needle rod moves axially relative to the front section of the insulation pipe.

[0016] Preferably, the air intake pipe comprises a JT groove, a fin tube and an air intake pipe, and the front and rear ends of the fin tube are respectively connected to the JT groove and the air intake pipe;

[0017] The front section of the JT slot is wound into a spring structure, and the spring structure is always located in the needle rod and at the front end of the insulation tube;

[0018] or,

[0019] The middle section of the JT slot is wound into a spring structure and is always located in the insulation tube;

[0020] or,

[0021] A spring structure is connected between the JT groove and the fin tube or / and between the fin tube and the air intake pipe, and the spring structure is a spring tube.

[0022] Preferably, the fixing component further comprises a core shaft, the core shaft is inserted from the rear end of the thermal insulation tube, and the outer wall of the core shaft is fixedly connected to the rear end of the thermal insulation tube without a gap;

[0023] The fin tube is wound into a plurality of spiral turns, and the core shaft passes through the spiral turns of the fin tube.

[0024] Preferably, the air intake pipe comprises a JT groove, a spring structure and an air intake pipe, the front and rear ends of the spring structure are respectively connected to the JT groove and the air intake pipe, and the outer side of the spring structure is also provided with fins;

[0025] The ablation needle further comprises a core shaft, which is inserted from the rear end of the thermal insulation tube and passes through the spiral coil of the spring structure;

[0026] Preferably, the fixing component also includes a temperature measuring line, which passes through the core shaft and extends forward through the interior of the thermal insulation tube, and the temperature measuring point of the temperature measuring line is located at the front end of the thermal insulation tube.

[0027] Preferably, the core shaft is a hollow tubular structure, and the temperature measuring wire and the core shaft are sealed by pouring glue.

[0028] Preferably, it also includes an adjustment lever and a handle:

[0029] The handle is wrapped around the outside of the insulation tube and fixedly connected to the insulation tube. An adjustment groove is provided on the side wall of the handle. The adjustment lever passes through the adjustment groove and is fixedly connected to the needle bar. The adjustment lever is pushed axially, and the adjustment lever drives the needle bar to move axially relative to the front section of the insulation tube.

[0030] Preferably, a plurality of safety locking grooves are further provided on the side wall of the handle, wherein the safety locking grooves are located outside the adjusting groove and are connected thereto, and the adjusting lever can be inserted into the safety locking grooves to be fixed.

[0031] Preferably, the safety locking groove includes a radial rotation groove and a safety card groove, wherein the radial rotation groove is located in the radial direction of the needle rod, and the radial rotation groove is arranged outside the adjustment groove and communicated with it; the safety card groove is located in the axial direction of the needle rod, and the safety card groove is arranged outside the radial rotation groove and communicated with it;

[0032] The adjusting lever is rotated along the circumferential direction of the handle to enter the radial rotating groove, and then the adjusting lever is axially moved to be clamped into the safety clamping groove.

[0033] Preferably, the wall of the heat-insulating tube is a double-layer vacuum wall:

[0034] The heat-insulating tube comprises a heat-insulating inner tube and a heat-insulating outer tube, and the two ends of the heat-insulating inner tube and the heat-insulating outer tube are fixedly connected; a vacuum interlayer is formed between the heat-insulating inner tube and the heat-insulating outer tube.

[0035] Preferably, the front section of the heat-insulating tube is a straight tube, the middle section is a curved tube, and the rear section is a straight tube.

[0036] Compared with the prior art, the present invention has the following technical effects:

[0037] 1. The present invention uses the needle rod to link the axial movement of the air inlet pipe to achieve the length adjustment of the target area, which solves the technical problems of the existing cryoablation needle that the treatment operation is complicated and the surrounding healthy tissues are easily damaged due to the fixed target area.

[0038] 2. The existing cryoablation needles with adjustable target areas all have at least two parts that need to be sealed. Since the existing sealing structures all use sealing rings to achieve sealing, and the sealing rings are easily consumable, the more parts that need to be sealed, the greater the probability of air leakage. Once air leakage occurs during the operation, it is very likely to cause frostbite to the patient and the doctor. Therefore, the present invention reduces the number of sealing rings to one, reduces the probability of air leakage, and improves the safety of cryotherapy.

[0039] 3. The air inlet pipe is a retractable structure, and the front end of the air inlet pipe is fixedly connected to the front end of the needle rod, ensuring that the position of the throttle hole moves with the needle rod during the adjustment of the target area, thereby ensuring that the ice ball can grow forward to cover the needle tip, avoiding the throttle hole being too far away from the needle tip during the adjustment process, resulting in the needle tip passing through the tumor and inserting into normal tissue during the operation.

[0040] 4. A safety locking groove for fixing the adjusting lever is provided at the handle. When the adjusting lever is moved to the desired position, the adjusting lever is fixed by the safety locking groove, which not only prevents the adjusting component from moving relative to the fixed component and causing accidental adjustment of the length of the target area, but also ensures that the needle rod will not be rushed out by the high-pressure gas through the fixed connection between the front and rear ends of the air intake pipe and the needle rod and the insulation tube respectively.

[0041] 5. Considering the doctor's hand-holding comfort, the curved hand-held operation is more comfortable.

[0042] 6. The curved 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 cryoablation needle is more suitable for minimally invasive surgeries such as CT and MRI.

[0043] 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

[0044] 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:

[0045] Figure 1 It is a schematic diagram of the structure of a curved adjustable cryoablation needle of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure in which the spring structure is arranged in the target area when the target area is the shortest in the present invention;

[0047] Figure 3 It is a structural schematic diagram of the spring structure being arranged in the target area when the target area is the longest in the present invention;

[0048] Figure 4 This is a schematic diagram of the structure in which the spring structure is arranged in the heat-insulating tube when the target area is the shortest in the present invention;

[0049] Figure 5 This is a schematic diagram of the structure in which the spring structure is arranged in the heat insulation tube when the target area is the longest in the present invention;

[0050] Figure 6 It is a schematic diagram of the structure in which the spring structure acts as a fin tube when the target area is the shortest in the present invention;

[0051] Figure 7 It is a structural schematic diagram of the spring structure acting as a fin tube when the target area is the longest in the present invention;

[0052] Figure 8 It is a schematic diagram of the structure in which the adjusting lever is located in the adjusting slot in the present invention;

[0053] Fig. 9 It is a schematic diagram of the structure in which the adjusting lever is located in the radial rotation slot in the present invention;

[0054] Fig.10 It is a structural schematic diagram of the adjustment lever in the present invention being located in the safety slot. DETAILED DESCRIPTION

[0055] The following will be combined Figures 1 to 10A 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.

[0056] Please refer to Figures 1 to 7 , a curved adjustable cryoablation needle, comprising an adjusting component 1 and a fixing component 2, wherein the adjusting component 1 can move axially relative to the fixing component 2 to form a targeting area 3 with adjustable length and a heat-insulating area 4 with fixed length on the outer surface of the ablation needle:

[0057] The fixing component 2 includes a heat-insulating tube 21 and a return air tube 22. The heat-insulating tube 21 is a curved tube. The return air tube 22 is inserted from the rear end of the heat-insulating tube 21 and fixedly connected thereto.

[0058] The adjusting component 1 includes a needle rod 11 and an air intake pipe 12, wherein the needle rod 11 is sleeved on the front section of the insulation tube 21 and is axially slidably connected thereto; the air intake pipe 12 is inserted from the rear end of the insulation tube 21 and extends into the needle rod 11, and the air intake pipe 12 is fixedly connected to the needle rod 11, and the needle rod 11 is linked to the air intake pipe 12 to adjust the length of the target area 3.

[0059] The present invention does not impose any specific restrictions on the bending shape of the insulation tube 21, and the specific shape of this structure can be determined according to specific surgical requirements. For example, the front section of the insulation tube 21 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 insulation tube 21 is composed of at least one curved tube, as long as the needle rod 11 can be covered with the front section of the insulation tube 21 and slide axially with it, during the relative axial sliding process between the needle rod 11 and the front section of the insulation tube 21, the needle rod 11 drives the air intake pipe 12 to move in the insulation tube 21 to adjust the length of the target area 3.

[0060] A specific embodiment is described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

[0061] In this embodiment, the heat-insulating pipe 21 includes a first straight pipe 213, a curved pipe 214 and a second straight pipe 215 which are integrally formed, that is, the front section and the rear section of the heat-insulating pipe 21 are both straight pipes, and the middle section is a curved pipe 214. The first straight pipe 213 and the second straight pipe 215 are respectively connected to the front and rear ends of the curved pipe 214, and the return air pipe 22 is inserted from the rear end of the second straight pipe 215 and fixedly connected thereto.

[0062] The adjusting component 1 includes a needle rod 11 and an air intake pipe 12, wherein the needle rod 11 is sleeved on the first straight tube 213 and slidably connected thereto; the air intake pipe 12 is inserted from the rear end of the second straight tube 215 and extends into the needle rod 11, and the air intake pipe 12 is fixedly connected to the needle rod 11.

[0063] The tube wall of the insulated tube 21 is made of insulating material and can also be a double-layer vacuum wall. The present invention does not make any specific restrictions. The present embodiment preferably uses a double-layer vacuum wall, that is, the insulated tube 21 includes an insulated inner tube 211 and an insulated outer tube 212. The two ends of the insulated inner tube 211 and the insulated outer tube 212 are fixedly connected. The two ends of the insulated inner tube 211 and the insulated outer tube 212 can be fixedly connected with a flat end, a flared end, or a shrunken end. The present invention does not make any restrictions on this. A vacuum interlayer is formed between the insulated inner tube 211 and the insulated outer tube 212.

[0064] The inner diameters of the first straight tube 213 and the second straight tube 215 may be the same or different, and the present invention does not impose any specific restrictions on this. In this embodiment, since the rear end of the second straight tube 215 needs to accommodate fins, the inner diameter of the second straight tube 215 needs to be larger than the inner diameter of the first straight tube 213. In order to enable the first straight tube 213 and the second straight tube 215 to be connected continuously, the insulation tube 21 includes a first straight tube 213 section, a connecting tube section, and a second straight tube 215 section that are fixedly connected and communicated in sequence, the inner diameter of the second straight tube 215 section is the same as the inner diameter of the second straight tube 215, the inner diameter of the first straight tube 213 section is smaller than the inner diameter of the second straight tube 215, and the connecting tube is a trumpet tube, that is, the inner diameter of one end of the connecting tube is the same as the inner diameter of the first straight tube 213 section, and the inner diameter of the other end is the same as the inner diameter of the second straight tube 215 section. In this embodiment, the wall thickness of each component of the insulation tube 21 is the same. Furthermore, the needle rod 11 is axially slidably connected to the first straight tube 213 .

[0065] In the present embodiment, a needle tip 111 is provided at the front end of the needle rod 11, and the needle tip 111 is blocked and closed; the needle rod 11 has an accommodating space for the front section of the air intake pipe 12 and the first straight tube 213. In the present embodiment, the needle rod 11 is a straight cylindrical structure, and the vertical distance between the front end of the needle tip 111 and the front end face of the first straight tube 213 (this front end face is the end face of the maximum outer diameter of the first straight tube 213) is the length of the target area 3. With the relative axial sliding between the needle rod 11 and the first straight tube 213, the length of this target area 3 is variable; the overall length of the insulation tube 21 is the length of the insulation area 4, and this length is fixed.

[0066] In the present invention, the front end of the air intake pipe 12 is fixedly connected to the front end of the needle rod 11, and the front end of the air intake pipe 12 transports cold air to the needle rod 11 by opening a throttling hole 1211. The setting structure of the throttling hole 1211 is described in detail below in combination with two embodiments.

[0067] As an example, please refer to Figures 4 to 7 A countersunk hole is provided in the needle tip 111 of the needle rod 11, and the countersunk hole is communicated with the interior of the needle rod 11. The front end of the air intake pipe 12 is inserted into and fixed in the countersunk hole. A plurality of throttling holes 1211 are provided on the air intake pipe 12, and the plurality of throttling holes 1211 are always located in front of the insulation tube 21, that is, no matter how the needle rod 11 and the insulation tube 21 slide relative to each other, the throttling holes 1211 will not enter the insulation tube 21.

[0068] Furthermore, a plurality of throttling holes 1211 are evenly distributed along the axial or radial direction of the air inlet pipe 12, and the distribution section length of the throttling holes 1211 should not be greater than the length from the rear end face of the needle tip 111 to the front end face of the insulation wall in the shortest target area 3, so as to ensure that when the target area 3 is in any adjustment position, the throttling holes 1211 are always located inside the target area 3. If some of the throttling holes 1211 are located inside the insulation tube 21, part of the cold energy will not be released in the target area 3.

[0069] As another example, please refer to Figure 2 and Figure 3 The outer wall of the front end of the air intake pipe 12 is fixed on the inner wall of the needle rod 11, and a throttling hole 1211 is opened at the front end of the air intake pipe 12.

[0070] In the present invention, at the front end, a dynamic seal is used between the needle rod 11 and the first straight tube 213. The present invention does not specifically limit whether the rear end return air pipe and the air inlet pipe are respectively sealed with the insulation pipe by a sealing ring or directly fixedly connected without gaps to achieve the sealing effect. In the prior art, the existing cryoablation needles of the adjustable targeting area 3 have at least two parts that need to be sealed. Since the existing sealing structures all use sealing rings to achieve sealing, and the sealing rings are easily consumable equipment, the more parts that need to be sealed, the greater the probability of air leakage. Once air leakage occurs during the operation, it is very likely to cause frostbite to the patient and the doctor. Therefore, the present invention preferably reduces the number of sealing rings to one, which reduces the probability of air leakage and improves the safety of cryotherapy. The specific structure is as follows:

[0071] In this embodiment, the inner diameter of the needle rod 11 is larger than the outer diameter of the first straight tube 213, and there is a gap between the inner wall of the needle rod 11 and the outer wall of the first straight tube 213. In order to prevent cold air from leaking from the gap, a dynamic seal is used between the needle rod 11 and the first straight tube 213.

[0072] Furthermore, the needle rod 11 and the first straight tube 213 are dynamically sealed by a seal 13:

[0073] As an embodiment, the sealing member 13 includes a sealing ring 131. An annular groove is provided on the inner wall of the needle rod 11 or the outer wall of the first straight tube 213. The sealing ring 131 is embedded in the groove. The sealing ring 131 is dynamically sealed and disposed between the needle rod 11 and the first straight tube 213.

[0074] As another embodiment, the sealing member 13 includes a sealing ring 131 and a sealing ring baffle, both of which are annular structures. The sealing ring baffle is fixed on the needle rod 11 or the first straight tube 213, and a groove for accommodating the sealing ring 131 is provided on the sealing ring baffle. When the sealing ring baffle is fixed on the needle rod 11, the groove faces the first straight tube 213, and the sealing ring 131 is fixed in the groove and tightly adheres to the outer wall of the first straight tube 213 to seal the gap between the needle rod 11 and the first straight tube 213; when the sealing ring baffle is fixed on the outer wall of the first straight tube 213, the groove faces the needle rod 11, and the sealing ring 131 is fixed in the groove and tightly adheres to the inner wall of the needle rod 11 to seal the gap between the needle rod 11 and the first straight tube 213.

[0075] The sealing ring baffle can be an integrated structure (please refer to Figure 1 ), or a detachable structure (please refer to Figures 2 to 7 ), the present invention does not impose specific restrictions on this. In order to facilitate the replacement of the sealing ring 131, the present embodiment preferably has a detachable sealing ring baffle, that is, the sealing ring baffle includes a front baffle 132 and a rear baffle 133, and the front baffle 132 and the rear baffle 133 are detachably connected, such as being snap-fitted or threadedly connected. In the present embodiment, preferably, the front baffle 132 is sleeved on (fixed) the rear end of the needle rod 11, and the rear baffle 133 is threadedly fixedly connected to the front baffle 132, and a groove facing the first straight tube 213 is formed between the front baffle 132 and the rear baffle 133, and the sealing ring 131 is embedded in the groove.

[0076] In this embodiment, the front end of the ablation needle is sealed with a seal 13, while the rear end is not. The specific structure is as follows:

[0077] As an embodiment, a rear end wall is fixedly provided at the rear end of the second straight pipe 215, and a return air pipe insertion hole and an intake pipe insertion hole are opened on the rear end wall. The return air pipe 22 is inserted into the insulation pipe 21 from the return air pipe insertion hole, and is fixedly connected to the return air pipe insertion hole without a gap.

[0078] The air intake pipe 12 is inserted into the heat insulation tube 21 from the air intake pipe insertion hole and extends all the way to the front end of the needle rod 11 , and the outer wall of the air intake pipe 12 is fixedly connected to the air intake pipe insertion hole without a gap.

[0079] As another embodiment, there is no need to set a rear end wall at the rear end of the second straight pipe 215. At the rear end of the second straight pipe 215, the outer walls of the return air pipe 22 and the air intake pipe fitting 12 and the inner wall of the second straight pipe 215 are directly fixed by seamless welding, that is, the gap between the outer walls of the return air pipe 22 and the air intake pipe fitting 12 and the inner wall of the second straight pipe 215 is filled with solder.

[0080] In the present invention, the front end of the air intake pipe fitting 12 is fixed to the needle rod 11, and the rear end is fixed to the second straight tube 215, but the needle rod 11 and the first straight tube 213 are relatively movable axially, so the length of the air intake pipe fitting 12 must be retractable. In order to meet the retractability of the air intake pipe fitting 12, the air intake pipe fitting 12 may have a certain flexibility, such as being made of a flexible material; the air intake pipe fitting 12 may also be made into a retractable spring structure, and the present invention does not impose specific restrictions on this. The present embodiment is preferably made into a spring structure, such as at least one section of the air intake pipe fitting 12 is a spring structure. Since the air intake pipe fitting 12 includes a JT groove 121, a fin tube 122 and an air intake pipe 123, the front and rear ends of the fin tube 122 are respectively connected to the JT groove 121 and the air intake pipe 123. In order to achieve the scalability of the intake pipe 12, as an embodiment, a spring structure (this spring structure is a spring tube) can be added between the JT groove 121 and the fin tube 122 or / and between the fin tube 122 and the intake pipe 123. If the spring tube is connected between the JT groove 121 and the fin tube 122, the spring tube is respectively connected to the JT groove 121 and the fin tube 122; if the spring tube is connected between the fin tube 122 and the intake pipe 123, the spring tube is respectively connected to the fin tube 122 and the intake pipe 123.

[0081] As another embodiment, at least a section of the air intake pipe 12 is wound into a spring structure 1212, and the spring structure 1212 can be stretched or compressed as the needle rod 11 moves axially relative to the first straight tube 213. This embodiment is described in detail below with reference to the accompanying drawings.

[0082] The air intake pipe 12 includes a JT groove 121, which is located at the front section of the air intake pipe 12. The front end of the JT groove 121 is fixed to the front end of the needle rod 11. As an embodiment, please refer to Figure 2 and Figure 3The front section of the JT groove 121 is wound into a spring structure 1212, and the spring structure 1212 is always located in the needle rod 11 and at the front end of the insulation tube 21. No matter how the needle rod 11 and the insulation tube 21 move relative to each other, the spring structure 1212 is always located in the target area 3; as another embodiment, please refer to Figure 4 and Figure 5 The middle section of the JT slot 121 is wound into a spring structure 1212 . No matter how the needle rod 11 and the insulation tube 21 move relative to each other, the spring structure 1212 is always located inside the insulation tube 21 .

[0083] In this embodiment, the throttle hole 1211 is located on the JT groove 121 .

[0084] In this embodiment, the fixing component 2 also includes a core shaft 24, and the core shaft 24 is inserted from the rear end of the second straight tube 215; further, a core shaft insertion hole is opened on the rear end wall of the insulation tube 21, and the core shaft 24 is inserted into the insulation tube 21 from the core shaft insertion hole, and the core shaft 24 is fixedly connected to the core shaft insertion hole without a gap.

[0085] In the present invention, the air intake pipe 12 may include a finned tube, or may not include a finned tube, but may use a spring structure as the finned tube. The specific structure is as follows:

[0086] When the air intake pipe fitting 12 includes a finned tube, that is, the air intake pipe fitting 12 includes a JT groove 121, a finned tube 122 and an air intake pipe 123, the front and rear ends of the finned tube 122 are respectively connected to the JT groove 121 and the air intake pipe 123, the finned tube 122 is wound into a plurality of spiral turns, and the core shaft 24 passes through the spiral turns of the finned tube 122; the front section or the middle section of the JT groove 121 is provided with a spring structure 1212, the specific structure of which has been described above and will not be repeated here.

[0087] When the air intake pipe 12 does not include the finned tube 122, the spring structure 122' acts as the finned tube 122, please refer to Figure 6 and Figure 7 That is, the air intake pipe 12 includes a JT groove 121, a spring structure 122' and an air intake pipe 123. The spring structure 1212 may be provided on the JT groove 121, or may not be provided. The present invention does not make any specific limitation. This embodiment takes the JT groove 121 without the spring structure 1212 as an example. The front and rear ends of the spring structure 122' are respectively connected to the JT groove 121 and the air intake pipe 123. The spring structure 122' is always located in the insulation tube 21. The core shaft 24 passes through the spring structure 122'. The outer side of the spring structure 122' is also provided with fins.

[0088] Furthermore, the spring structure 122 ′ is a hollow tube made of stainless steel, spring steel, nickel-titanium alloy or other memory metal materials.

[0089] In this embodiment, the air inlet pipe 123 is fixedly connected to the rear end wall of the second straight pipe 215 without any gap.

[0090] In the present invention, the fixing component 2 also includes a temperature measuring line 25 , which passes through the core shaft 24 and extends forward through the inside of the insulation tube 21 . The temperature measuring point 251 of the temperature measuring line 25 is located at the front end of the first straight tube 213 .

[0091] Furthermore, the core shaft 24 is a hollow tubular structure, and the temperature measuring line 25 and the core shaft 24 are sealed by pouring glue.

[0092] In the present invention, the adjusting component 1 can be directly operated manually to make it move relative to the fixed component, 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:

[0093] Please refer to Figures 2 to 10 , the adjusting component 1 further includes an adjusting lever 14, and the fixing component 2 further includes a handle 23:

[0094] The handle 23 is wrapped around the outside of the insulation tube 21 and fixedly connected to the insulation tube 21. In this embodiment, the shape of the handle 23 matches the shape of the insulation tube 21. An adjustment slot 231 is provided on the side wall of the handle 23. The adjustment slot 231 is long and arranged along the axial direction of the needle rod 11. The adjustment lever 14 passes through the adjustment slot 231 and is fixedly connected to the needle rod 11. The adjustment lever 14 is pushed axially, and the adjustment lever 14 drives the needle rod 11 to move axially relative to the first straight tube 213, that is, the adjustment lever 14 is axially slid, and the adjustment lever 14 drives the entire adjustment component 1 to move axially relative to the fixed component 2.

[0095] When the adjustment lever 14 is at the rearmost end of the adjustment slot 231, the needle rod 11 is at the rearmost position relative to the first straight tube 213, at which time the length of the target area 3 is the smallest, and the ice ball produced by freezing is the smallest. When the adjustment lever 14 is adjusted to the frontmost end of the adjustment slot 231, the needle rod 11 extends to the frontmost position relative to the first straight tube 213, at which time the length of the target area 3 is the largest, and the ice ball produced by freezing is the largest.

[0096] As an embodiment, when the target area 3 is the shortest, the spring structure is in a natural state (when the spring structure is in the natural state, the spiral coil of the spring structure can be tightly wound without gaps, but the present invention is not limited thereto), and when the target area 3 is lengthened, the spring structure is in a stretched state;

[0097] As another embodiment, when the target area 3 is the longest, the spring structure is in a natural state (when the spring structure is in the natural state, there is a gap between the spiral coils of the spring structure), and when the target area 3 is shortened, the spring structure is in a compressed state;

[0098] As a third embodiment, when the targeting zone 3 is of intermediate length, the spring structure is in a natural state (when the spring structure is in the natural state, there is a gap between the spiral coils of the spring structure), when the targeting zone 3 is lengthened from the intermediate targeting zone 3 position, the spring is in a stretched state, and when the targeting zone 3 is shortened from the intermediate targeting zone 3 position, the spring is in a compressed state.

[0099] In the present invention, please refer to Figures 8 to 10 , the side wall of the handle 23 is also provided with a plurality of safety locking grooves, the safety locking grooves are located outside the adjustment groove 231 and are connected thereto, and the adjustment lever 14 can be inserted into the safety locking grooves to be fixed. In the present invention, if the friction force of the dynamic seal between the needle bar 11 and the first straight tube 213 is large enough, the needle bar 11 will not slide relative to the first straight tube 213 when the doctor is treating the patient. Therefore, if the friction force between the needle bar 11 and the first straight tube 213 is large enough, the adjustment lever 14 can be limited by the safety locking grooves instead of the friction force.

[0100] Furthermore, the safety locking groove includes a radial rotation groove 232 and a safety card groove 233, wherein the radial rotation groove 232 is located in the radial direction of the needle rod 11, and the radial rotation groove 232 is arranged on the outside of the adjustment groove 231 and is connected thereto; the safety card groove 233 is located in the axial direction of the needle rod 11, and the safety card groove 233 is arranged on the outside of the radial rotation groove 232 and is connected thereto; the adjustment lever 14 is rotated along the circumferential direction of the handle 23 into the radial rotation groove 232, and then the adjustment lever 14 is moved axially to be clamped into the safety card groove 233, and the direction of the safety card groove 233 is the same as the direction of the spring force.

[0101] In the present invention, the safety locking groove and the front and rear ends of the air inlet pipe 12 are respectively fixedly connected to the needle rod 11 and the insulation tube 21, thereby ensuring that the needle rod 11 will not be rushed out by the high-pressure gas.

[0102] The present invention does not limit the shape of the curved tube 214 . In this embodiment, the curved tube 214 is an arc-shaped tube, the bending angle of the arc-shaped tube is 90°, and the first straight tube 213 is perpendicular to the second straight tube 215 .

Claims

1. A curved adjustable cryoablation needle, characterized in that: It comprises an adjusting component and a fixing component, and the adjusting component can move relative to the fixing component to adjust the length of the target area: the fixing component comprises a heat-insulating tube and a return air tube, the heat-insulating tube is a curved tube, and the return air tube is inserted from the rear end of the heat-insulating tube and fixedly connected thereto; the adjusting component comprises a needle rod and an air intake pipe fitting, the needle rod is sleeved on the front section of the heat-insulating tube and axially slidably connected thereto; the air intake pipe fitting is inserted from the rear end of the heat-insulating tube and extends into the needle rod, the air intake pipe fitting is fixedly connected to the needle rod, and the needle rod is linked to the air intake pipe fitting to adjust the length of the target area; A countersunk hole is provided in the needle tip of the needle rod, the countersunk hole is communicated with the interior of the needle rod, and the front end of the air intake pipe is fixed in the countersunk hole; a plurality of throttle holes are provided on the air intake pipe, and the plurality of throttle holes are always located in front of the heat insulation tube; or, the outer wall of the air intake pipe is fixed on the inner wall of the needle rod, and a throttle hole is provided at the front end of the air intake pipe; The needle rod is sheathed on the front section of the heat-insulating tube through a sealing member and is axially slidably connected thereto; the air intake pipe is retractable, the air intake pipe and the air return pipe are both inserted from the rear end of the heat-insulating tube, and the outer walls of the air intake pipe and the air return pipe are fixedly connected to the rear end of the heat-insulating tube without a gap; The sealing member includes a sealing ring, a groove for accommodating the sealing ring is provided on the front section of the needle rod or the heat-insulating tube, and the sealing ring is dynamically sealed and arranged between the needle rod and the front section of the heat-insulating tube; or, the sealing member includes a sealing ring and a sealing ring baffle, the sealing ring baffle is fixedly arranged on the front section of the needle rod or the heat-insulating tube, a groove for accommodating the sealing ring is provided on the sealing ring baffle, and the sealing ring is dynamically sealed and arranged between the needle rod and the front section of the heat-insulating tube; The sealing ring baffle includes a front baffle and a rear baffle, the front baffle is sleeved on the rear end of the needle rod, the rear baffle is threadedly fixedly connected to the front baffle, a groove facing the front section of the insulation tube is formed between the front baffle and the rear baffle, and the sealing ring is embedded in the groove.

2. The curved adjustable cryoablation needle according to claim 1, characterized in that: At least one section of the air inlet pipe is a spring structure, and the spring structure can be stretched or compressed as the needle rod moves axially relative to the front section of the insulation pipe.

3. The curved adjustable cryoablation needle according to claim 2, characterized in that: The intake pipe fitting includes a JT groove, a fin tube and an intake pipe, and the front and rear ends of the fin tube are respectively connected to the JT groove and the intake pipe; the front section of the JT groove is wound into a spring structure, and the spring structure is always located in the needle rod and located at the front end of the insulation tube; or, the middle section of the JT groove is wound into a spring structure and is always located in the insulation tube; or, the spring structure is connected between the JT groove and the fin tube or / and between the fin tube and the intake pipe, and this spring structure is a spring tube.

4. The curved adjustable cryoablation needle according to claim 3, characterized in that: The fixing component also includes a core shaft, which is inserted from the rear end of the insulation tube, and the outer wall of the core shaft is fixedly connected to the rear end of the insulation tube without a gap; the fin tube is wound into a plurality of spiral turns, and the core shaft passes through the spiral turns of the fin tube.

5. The curved adjustable cryoablation needle according to claim 1, characterized in that: The air inlet pipe includes a JT groove, a spring structure and an air inlet pipe. The front and rear ends of the spring structure are respectively connected to the JT groove and the air inlet pipe. Fins are also provided on the outside of the spring structure. The ablation needle also includes a core shaft, which is inserted from the rear end of the insulation tube and passes through the spiral coil of the spring structure.

6. The adjustable curved cryoablation needle according to claim 4 or 5, characterized in that: The fixing component also includes a temperature measuring line, which passes through the core shaft and extends forward through the interior of the thermal insulation tube. The temperature measuring point of the temperature measuring line is located at the front end of the thermal insulation tube.

7. The curved adjustable cryoablation needle according to claim 1, characterized in that: It also includes an adjustment rod and a handle: the handle is wrapped around the outside of the insulation tube and fixedly connected to the insulation tube, an adjustment groove is provided on the side wall of the handle, the adjustment rod passes through the adjustment groove and is fixedly connected to the needle rod, and the adjustment rod is pushed axially, and the adjustment rod drives the needle rod to move axially relative to the front section of the insulation tube.

8. The curved adjustable cryoablation needle according to claim 7, characterized in that: A plurality of safety locking grooves are also provided on the side wall of the handle. The safety locking grooves are located outside the adjusting groove and are connected thereto. The adjusting lever can be inserted into the safety locking grooves to be fixed.

9. The curved adjustable cryoablation needle according to claim 8, characterized in that: The safety locking groove includes a radial rotation groove and a safety card groove, wherein the radial rotation groove is located in the radial direction of the needle rod, and the radial rotation groove is arranged on the outer side of the adjustment groove and is connected thereto; the safety card groove is located in the axial direction of the needle rod, and the safety card groove is arranged on the outer side of the radial rotation groove and is connected thereto; the adjustment lever is rotated along the circumferential direction of the handle into the radial rotation groove, and then the adjustment lever is moved axially to be clamped into the safety card groove.

10. The curved adjustable cryoablation needle according to claim 1, characterized in that: The front section of the heat insulation pipe is a straight pipe, the middle section is a curved pipe, and the rear section is a straight pipe.

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