CN211355848U - Cryoablation needle with adjustable target area - Google Patents

Abstract

The utility model relates to a cryoablation needle in adjustable target district, including adjusting part and fixed part, adjusting part can for fixed part axial motion is with the length in adjustment target district: the fixing component comprises a needle rod, a rear-section heat insulation pipe, an air inlet pipe fitting and an air return pipe, the rear end of the needle rod is fixedly connected with the front end of the rear-section heat insulation pipe, and the needle rod is communicated with the rear-section heat insulation pipe to form an accommodating cavity; the air inlet pipe fitting and the air return pipe are inserted into the accommodating cavity from the rear end of the rear-section heat insulation pipe; the adjusting component comprises a front-section heat insulation pipe and a mandrel, and the front-section heat insulation pipe is axially arranged in the accommodating cavity in a sliding manner so as to adjust the length of the target area; the air inlet pipe fitting penetrates through the front section heat insulation pipe and extends into the needle rod; the dabber inserts and links with the thermal-insulated pipe of anterior segment from the rear end of the thermal-insulated pipe of back end, the utility model provides a current cryoablation needle cause the treatment operation complicated and easily hinder the technical problem of peripheral healthy tissue because of the target district is fixed.

Description

Cryoablation needle with adjustable target area

Technical Field

The utility model relates to a cryoablation needle, in particular to a cryoablation needle with an adjustable target area.

Background

Cryoablation is a treatment that utilizes cryogenic temperatures to destroy diseased tissue and is considered an efficient, minimally invasive method of treating malignancies. The cryoablation technology has simple and convenient operation, few complications and effective analgesia, and the ice hockey formed by ablation has clear boundary and convenient observation, and can safely ablate the focus close to the great vessels or important visceral organs. The cryoablation can also adopt a multi-needle freezing mode, so that the ablation range is wider, and the cryoablation is suitable for large focuses and morphologically irregular focuses.

The target area (i.e. the effective freezing area) is positioned at the front end of the needle head of the cryoablation needle, the length of the target area determines the size of the freezing range, and the longer the target area is, the larger the ice ball formed by freezing is. However, most of the target regions of the existing cryoablation needles are fixed structures, the size of the generated ice ball is also fixed, and in clinical application, doctors need to select cryoablation needles with different target region lengths according to the size of a focus. For the irregular-shaped pathological tissues, a plurality of probes with different specifications are required to be used for carrying out treatment operation repeatedly, and the surrounding healthy tissues are easy to be injured. For example, for a pear-shaped tumor with a large head end and a small tail end, a single cryoablation needle with a long target area can be used for large-scale ablation in clinical practice at present, but a circle of normal tissues with more damage can be generated in the middle of the pear; the ablation can also be achieved by placing two cryoablation needles with short target areas in front and back for different times of freezing, but this increases the cost and difficulty of the operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cryoablation needle in adjustable target district to solve current cryoablation needle and cause the treatment operation complicated and easily hinder the technical problem of peripheral healthy tissue because of the target district is fixed.

In order to solve the above problem, the present invention provides a cryoablation needle with an adjustable target area, which comprises an adjusting part and a fixing part, wherein the adjusting part can move axially relative to the fixing part to adjust the length of the target area:

the fixing component comprises a needle bar, a rear-section heat insulation pipe, an air inlet pipe fitting and an air return pipe, the rear end of the needle bar is fixedly connected with the front end of the rear-section heat insulation pipe, and the needle bar is communicated with the rear-section heat insulation pipe to form an accommodating cavity; the air inlet pipe fitting and the air return pipe are inserted into the accommodating cavity from the rear end of the rear-section heat insulation pipe;

the adjusting component comprises a front-section heat insulation pipe and a mandrel, the front-section heat insulation pipe is axially and slidably arranged in the accommodating cavity so as to adjust the length of the target area (the front-section heat insulation pipe can extend into the needle rod, and the vertical distance between the front end of the front-section heat insulation pipe and the front end of the needle point is the length of the target area); the air inlet pipe fitting penetrates through the front section heat insulation pipe and extends into the needle rod; the mandrel is inserted from the rear end of the rear section heat insulation pipe and is linked with the front section heat insulation pipe.

Preferably, the needle rod is sleeved on the front section heat insulation pipe in a sleeving manner, and the outer wall of the front section heat insulation pipe is in dynamic sealing connection with the inner wall of the rear section heat insulation pipe through a front end sealing assembly.

Preferably, the front end sealing assembly comprises a front end sealing ring assembly and a middle connecting pipe, and the front end sealing ring assembly is arranged between the outer wall of the front section heat insulation pipe and the inner wall of the rear section heat insulation pipe; the front end of the middle connecting pipe is fixedly connected and communicated with the front section heat insulation pipe, and the rear end of the middle connecting pipe is fixedly connected with the core shaft.

Preferably, the front end sealing ring assembly comprises a front end blocking sealing ring baffle and a front end sealing ring, the front end sealing ring baffle is fixedly sleeved at the front end of the middle connecting pipe or/and the rear end of the front section heat insulation pipe, a groove for accommodating the front end sealing ring is formed in the front end sealing ring baffle, and the front end sealing ring is fixedly arranged in the groove.

Preferably, the inner diameter of the rear-section heat insulation pipe is larger than that of the needle rod.

Preferably, the air inlet pipe fitting comprises a J-T groove, a finned tube and an air inlet pipe, two ends of the finned tube are fixedly connected and communicated with the J-T groove and the air inlet pipe respectively, and the finned tube is wound outside the mandrel;

and the wall of the middle connecting pipe is provided with an air return groove, and the J-T groove penetrates into the front section heat insulation pipe from the outside to the inside of the air return groove and extends to the front end of the needle rod.

Preferably, the fixing component further comprises a rear end sealing assembly, and the mandrel is in dynamic sealing connection with the rear-section heat insulation pipe through the rear end sealing assembly.

Preferably, the rear end sealing assembly comprises two rear end sealing ring baffles and a rear end sealing ring, the rear end sealing ring baffle is fixedly arranged on the inner wall of the rear section heat insulation pipe, the two rear end sealing ring baffles are matched to fix the rear end sealing ring, and the mandrel penetrates through the rear end sealing ring and is in dynamic sealing connection with the rear end sealing ring;

two leading-out holes are further formed in the rear end sealing ring baffle, and the air inlet pipe and the air return pipe are respectively fixed in one leading-out hole.

Preferably, the rear end sealing assembly comprises a rear end sealing ring assembly and an extension pipe, the front end of the extension pipe is fixedly communicated with the rear end surface of the rear section heat insulation pipe, the rear end sealing ring assembly is arranged at the rear end of the extension pipe, and the mandrel penetrates through the extension pipe and is in dynamic sealing connection with the rear end sealing ring assembly.

Preferably, the rear end face of the rear-section heat insulation pipe is further provided with two lead-out holes, and the air inlet pipe and the air return pipe are respectively fixed in one of the lead-out holes.

Preferably, the rear end sealing ring assembly comprises two rear end sealing ring baffles and a rear end sealing ring, the rear end sealing ring baffle is fixedly arranged at the rear end of the extension pipe, the two rear end sealing ring baffles are matched to fix the rear end sealing ring, and the mandrel penetrates through the rear end sealing ring and is connected with the rear end sealing ring in a dynamic sealing mode.

Preferably, the adjusting part further comprises an adjusting sleeve, the adjusting sleeve is sleeved outside the rear section heat insulation pipe, a shift lever is fixedly arranged on the adjusting sleeve, a guide window and a mandrel connecting hole are formed in the rear end of the adjusting sleeve, and the mandrel penetrates through the mandrel connecting hole and is fixedly connected with the mandrel connecting hole.

Preferably, the fixing part further comprises a handle, the handle is fixedly sleeved on the needle rod or/and the rear-section heat insulation pipe, the adjusting sleeve is located in a gap between the handle and the rear-section heat insulation pipe, an adjusting groove is formed in the handle, and the shifting rod extends out of the adjusting groove.

Preferably, the fixed part further comprises a rear end sealing assembly, the rear end sealing assembly comprises a rear end sealing ring assembly, the air return pipe is arranged at the rear end of the handle in a sleeved mode, the air inlet pipe is located in the air return pipe, and the rear section heat insulation pipe is connected with the adjusting sleeve pipe in a dynamic sealing mode through the rear end sealing ring assembly.

Preferably, the rear end sealing ring assembly comprises two rear end sealing ring baffles and a rear end sealing ring, the rear end sealing ring baffle is fixedly arranged on the outer wall of the rear section heat insulation pipe, the two rear end sealing ring baffles are matched to fix the rear end sealing ring, and the rear end sealing ring is in contact with the inner wall of the adjusting sleeve and is in dynamic sealing connection with the inner wall.

Preferably, the fixing part further comprises a wire assembly, the wire assembly comprises a temperature measuring wire and a wire leading-out pipe, the wire leading-out pipe is fixed at the rear end of the rear-section heat insulation pipe, the temperature measuring wire sequentially penetrates through the front-section heat insulation pipe, the air return groove, the gap of the finned tube and the wire leading-out pipe leading-out needle, and a temperature measuring point of the temperature measuring wire is located at the front section of the J-T groove.

Preferably, glue is poured into the electric wire leading-out pipe, and the temperature measuring wire is connected with the electric wire leading-out pipe in a sealing mode through the glue.

Preferably, the adjusting part further comprises a temperature measuring line, the mandrel is a hollow pipe, the temperature measuring line sequentially penetrates through the front-section heat insulation pipe, the middle connecting pipe and the mandrel and is led out of the needle, and the temperature measuring point is located at the front end of the front-section heat insulation pipe.

Preferably, glue is poured into the mandrel, and the temperature measuring wire is connected with the mandrel in a sealing mode through the glue.

Preferably, the pipe wall of the rear-section heat insulation pipe is a double-layer vacuum wall, the rear-section heat insulation pipe comprises a rear-section inner pipe and a rear-section outer pipe, and a vacuum interlayer is formed between the rear-section inner pipe and the rear-section outer pipe.

Preferably, the tube wall of the front-section heat insulation tube is a double-layer vacuum wall, the front-section heat insulation 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.

Compared with the prior art, the utility model discloses there are following technological effect:

1. the length adjustment of the target area is realized by adopting a method of linking the mandrel with the front-section heat insulation pipe, and the technical problems that the treatment operation is complicated and peripheral healthy tissues are easy to be injured due to the fixation of the target area of the existing cryoablation needle are solved;

2. the needle bar and the rear section heat insulation pipe are firmly welded, so that the needle bar can be prevented from being ejected by high-pressure gas, and low-temperature gas can be prevented from leaking at a position close to a patient; the rear-section heat insulation pipe is positioned at the position where the doctor holds the pipe by hands, so that frostbite can be prevented, and cold energy loss is avoided;

3. the adjustment of the target area is completed only by operating from the rear part of the needle head without separating the needle rod and the rear-section heat insulation pipe from each other, the needle rod and the rear-end heat insulation pipe are firmly welded, and the needle rod is effectively prevented from being ejected by high-pressure gas due to the blockage of the air return channel;

4. the front end sealing assembly is placed in the needle and used for preventing frostbite of a patient or a doctor when the sealing ring is invalid;

5. the rear end sealing assembly is positioned at the rear part of the needle head and used for preventing return air flow from leaking out of the needle;

6. the front end sealing assembly is positioned in the needle, the rear end sealing assembly is positioned at the rear part of the needle head, once the sealing fails and leakage occurs, cold air can be discharged from the position far away from the patient and the hands of a doctor, frostbite cannot be caused, and the safety of the operation is ensured;

7. the method of linking the front-section heat insulation pipe by the mandrel solves the problem that the (front-section) heat insulation pipe is too long because the existing adjustable target area cryoablation needle adopts the method of exposing the (front-section) heat insulation pipe. The front-section heat insulation pipe is always positioned in the needle rod, so that the length of the front-section heat insulation pipe can be effectively shortened, and further, the more smooth the air return is, the lower the back pressure in the needle rod is, the lower the temperature of the needle head is, and the better the freezing performance is;

8. in the process of adjusting the target area, one overlapping area is always arranged between the front-section heat insulation pipe and the rear-section heat insulation pipe, so that the cold energy can be prevented from being released from the middle position of the heat insulation area.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. In the drawings:

fig. 1 is a schematic view of a cryoablation needle with an adjustable target area according to the present invention;

FIG. 2 is a schematic structural diagram of an adjusting member of the present invention;

FIG. 3 is a cross-sectional view A-A of the adjustment member of the present invention;

fig. 4 is a schematic structural view of the front end seal assembly of the present invention;

FIG. 5 is a cross-sectional view B-B of the mid-nose seal assembly of the present invention;

fig. 6 is a schematic structural view of a cryoablation needle with an adjustable target area according to an embodiment of the external rear-end sealing assembly of the present invention;

fig. 7 is a schematic structural diagram of an embodiment of the external rear end sealing assembly of the present invention;

FIG. 8 is a cross-sectional view C-C of an embodiment of the outer back end seal assembly of the present invention;

fig. 9 is a schematic structural view of an embodiment of the shortest target area of a cryoablation needle with adjustable target area according to the present invention;

fig. 10 is a schematic structural view of an embodiment of the longest target region of a cryoablation needle with adjustable target region according to the present invention;

FIG. 11 is a cross-sectional view D-D of one embodiment of the longest target zone of a cryoablation needle with an adjustable target zone in accordance with the present invention;

fig. 12 is a partial schematic view of a cryoablation needle with an adjustable target area according to another embodiment of the external back-end seal assembly of the present invention;

fig. 13 is a schematic structural view of another embodiment of the external rear end sealing assembly according to the present invention;

FIG. 14 is a cross-sectional view E-E of another embodiment of the outer back end seal assembly of the present invention;

fig. 15 is a schematic view of a partial structure of a cryoablation needle with an adjustable target area according to a third embodiment of the external back-end seal assembly of the present invention;

fig. 16 is a cross-sectional view F-F of a cryoablation needle with an adjustable target area of a third embodiment of an external back end seal assembly in accordance with the present invention;

FIG. 17 is a schematic diagram of an implementable structure of a temperature measuring line led out from the gap of the middle finned tube of the present invention;

FIG. 18 is a schematic structural view of the temperature measuring line led out from the center spindle of the present invention;

fig. 19 is a flow chart of the adjustable target area cryoablation needle for conformal ablation of pear-shaped tumors.

Detailed Description

The cryoablation needle with adjustable target area provided by the present invention will be described in detail with reference to fig. 1 to 19, and this embodiment is implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and color the cryoablation needle without changing the spirit and content of the present invention.

Referring to fig. 1 to 19, a cryoablation needle with adjustable target area comprises an adjusting part 1 and a fixing part 2, wherein the adjusting part 1 is movable relative to the fixing part 2 to form a target area 3 and a thermal insulation area 4 with adjustable length on the outer surface of the ablation needle, in the present invention, the lengths of the target area 3 and the thermal insulation area 4 are both adjustable:

the fixing component 2 comprises a needle bar 21, a rear section heat insulation pipe 22, an air inlet pipe 24 and an air return pipe 25, the rear end of the needle bar 21 is fixedly connected with the front end of the rear section heat insulation pipe 22, and the needle bar 21 is communicated with the rear section heat insulation pipe 22 to form an accommodating cavity; the air inlet pipe 24 and the air return pipe 25 are inserted into the accommodating cavity from the rear end of the rear-section heat insulation pipe 22;

the adjusting component 1 comprises a front-section heat insulation pipe 12 and a mandrel 11, and the front-section heat insulation pipe 12 is axially arranged in the accommodating cavity in a sliding manner so as to adjust the length of the target area 3; the air inlet pipe 24 penetrates through the front section heat insulation pipe 12 and extends into the needle rod 21; the mandrel 11 is inserted from the rear end of the rear-stage insulating pipe 22 and interlocked with the front-stage insulating pipe 12.

In this embodiment, the needle bar 21 is sleeved on the front section heat insulation pipe 12, and the outer wall of the front section heat insulation pipe 12 is connected with the inner wall of the rear section heat insulation pipe 22 in a dynamic sealing manner through the front end sealing assembly 13. The region formed on the outer surface of the ablation needle between the front end surface of the front-stage heat insulation tube 12 and the front end of the needle tip of the needle shaft 21 is a target region 3, which is an effective freezing region. The region formed between the front end of the front section heat insulation tube 12 and the rear end of the rear section heat insulation tube 22 on the outer surface of the ablation needle is a heat insulation region 4, and the heat insulation region 4 can prevent the normal tissue from being frostbitten. In this embodiment, the mandrel 11, the front-end heat insulation pipe 12 and the front-end sealing assembly 13 are integrated to perform a piston motion back and forth to adjust the lengths of the target region 3 and the heat insulation region 4.

In this embodiment, the front end of the front heat insulation pipe 12 extends into the needle bar 21, the rear end extends into the rear heat insulation pipe 22, the front heat insulation pipe 12 is used for heat insulation of the rear section of the needle bar 21, and the front end sealing assembly 13 is an axial piston sealing structure for preventing the return air flow from passing through the gap between the needle bar 21 and the front heat insulation pipe 12. The needle bar 21 and the rear section heat insulation pipe 22 can be welded or integrally formed in the axial direction, the utility model does not specifically limit the axial direction, and aims to prevent the needle bar 21 from being ejected by high-pressure gas and prevent low-temperature gas from leaking out at a position close to a patient. The rear section heat insulation pipe 22 is positioned at the position supported by the hands of the doctor, so that frostbite can be prevented, and cold loss is avoided.

The stationary part 2 further comprises a rear end seal assembly 23, the rear end seal assembly 23 also being an axial piston seal arrangement, the rear end seal assembly 23 serving to prevent the return air flow from leaking out of the needle.

The air inlet pipe 24 is inserted from the rear end of the rear section heat insulation pipe 22 and extends to the front end inside the needle bar 21, and is used for conveying and throttling high-pressure air to the target area 3, and the throttled air is discharged out of the needle through the front section heat insulation pipe 12 and the air return pipe 25 after the cold energy is released in the target area 3. Specifically, the air inlet pipe fitting 24 comprises a J-T groove 241, a finned tube 242 and an air inlet pipe 243, two ends of the finned tube 242 are respectively welded with and communicated with the J-T groove 241 and the air inlet pipe 243, the finned tube 242 is wound outside the mandrel 11 at a certain screw pitch, and the J-T groove 241 penetrates through the air return groove 1331, so that the position of the air inlet pipe fitting 24 cannot be influenced by the adjusting part 1 in the adjusting process.

In this embodiment, during the adjustment of the target zone 3, there is always an overlapping area between the front insulating pipe 12 and the rear insulating pipe 22, so that the cold can be prevented from being released from the middle of the insulating zone 4.

In the present embodiment, the front end sealing assembly 13 is located inside the needle, the rear end sealing assembly 23 is located at the rear end of the needle, and once leakage occurs, cold air can be discharged only from a position far away from the hands of the patient and the doctor, so that the safety of the operation is ensured.

For the cryoablation needle in which the air return pipe 25 and the air inlet pipe 243 are inserted into the rear-stage insulation pipe 22 side by side, the rear-end sealing assembly 23 is used for sealing the piston between the mandrel 11 and the inner wall of the rear-stage insulation pipe 22, and the rear-end sealing assembly 23 can be externally arranged on the rear-stage insulation pipe 22 or can be internally arranged in the rear-stage insulation pipe 22.

For the cryoablation needle with the muffler 25 sleeved on the air inlet pipe 243, the rear end sealing assembly 23 is used for sealing the piston between the rear-section heat insulation pipe 22 and the adjusting sleeve 14, and the rear end sealing assembly 23 is externally arranged at the rear end of the rear-section heat insulation pipe 22.

The following detailed description is made in conjunction with the accompanying drawings, which illustrate several embodiments.

Example 1

Referring to fig. 3, the wall of the front-section heat insulation pipe 12 may be made of a heat insulation material, or may be a double-layer vacuum wall, but the present invention is not limited to this, and the double-layer vacuum wall is preferred in this embodiment, that is, the front-section heat insulation pipe 12 includes a front-section inner pipe 122 and a front-section outer pipe 121, and a vacuum interlayer is formed between the front-section inner pipe 122 and the front-section outer pipe 121.

As an example, both ends of the front section outer tube 121 are shrunk and vacuum-welded with the front section inner tube 122 to form a permanent vacuum interlayer;

as another embodiment, both ends of the front section inner tube 122 are flared and vacuum welded with the front section outer tube 121 to form a permanent vacuum interlayer;

as a third embodiment, two ports of the front-section inner tube 122 are flush with two ports of the front-section outer tube 121, and a permanent vacuum interlayer is formed between the two ports.

Referring to fig. 4 and 5, the front end sealing assembly 13 includes a front end sealing ring 131 and an intermediate connecting pipe 133, the front end of the intermediate connecting pipe 133 is sleeved on the front section insulating pipe 12 and welded, and the rear end is sleeved on the mandrel 11 and welded. The present embodiment does not limit the specific arrangement structure of the front end seal ring 131:

as an embodiment, an annular groove is provided at the front end of the middle connection pipe 133 or the rear end of the front stage heat insulation pipe 12, and the front end sealing ring 131 is embedded in the annular groove;

in another embodiment, the front end sealing ring 131 is fixedly sleeved at the front end of the middle connecting pipe 133 or/and the rear end of the front section insulating pipe 12 by a front end sealing ring baffle, the front end sealing ring baffle is provided with a groove for accommodating the front end sealing ring 131, and the front end sealing ring is fixedly arranged in the groove. Specifically, the front end of the middle connecting pipe 133 is fixedly provided with two front end sealing ring baffles 132, the two front end sealing ring baffles 132 are arranged at intervals, and the front end sealing ring 131 is embedded between the two front end sealing ring baffles 132. The two front end seal ring baffles 132 may be integrally formed with an outer groove formed therebetween for securing the front end seal ring 131; alternatively, a front end sealing ring baffle 132 is welded on the outer wall of the middle connecting pipe 133, the two front end sealing ring baffles 132 can be connected in a threaded fastening manner, an outer groove is formed between the two front end sealing ring baffles 132, the front end sealing ring 131 is fixedly embedded in the outer groove, and the two front end sealing ring baffles 132 can be detachably connected to facilitate replacement of the front end sealing ring 131.

The internal diameter of the rear-section heat insulation pipe 22 is larger than that of the needle bar 21, the front-section heat insulation pipe 12 is always positioned in the rear-section heat insulation pipe 22 through the blocking of the front-end sealing assembly 13 and cannot enter the needle bar 21, and the purpose is that in the adjusting process of the targeting zone 3, one section of overlapping region is always arranged between the front-section heat insulation pipe 12 and the rear-section heat insulation pipe 22, the two sections cannot be separated from each other, and therefore cold energy can be prevented from being released from the middle position of the heat insulation zone 4.

In the present embodiment, the rear-stage heat insulating pipe 22 is a straight pipe, but the present invention is not limited thereto, and may be a bent pipe.

The pipe wall of the middle connecting pipe 133 is provided with an air return groove 1331, the number of the air return grooves 1331 is not limited in this embodiment, and may be one or two, and the air return groove 1331 is used for discharging the return air inside the front-stage heat insulating pipe 12 to the outside of the front-stage sealing assembly 13.

In this embodiment, the mandrel 11 is solid bar stock.

In this embodiment, the mandrel 11 and the rear-end heat insulation pipe 22 are connected in a dynamic sealing manner through the rear-end sealing assembly 23.

The pipe wall of back end heat insulation pipe 22 can adopt thermal insulation material to make, also can adopt double-deck vacuum wall, the utility model discloses do not specifically limit, the preferred double-deck vacuum wall of this embodiment, the pipe wall of back end heat insulation pipe 22 is double-deck vacuum wall promptly, back end heat insulation pipe 22 includes back end inner tube 222 and back end outer tube 221, form vacuum interlayer between back end inner tube 222 and the back end outer tube 221. The two ends of the rear-section outer pipe 221 are necked down and are welded with the rear-section inner pipe 222 in a vacuum manner to form a permanent vacuum interlayer; alternatively, both ends of the rear-section inner tube 222 are flared and vacuum-welded with the rear-section outer tube 221 to form a permanent vacuum interlayer.

In this embodiment, the muffler 25 and the intake pipe 243 are inserted side by side into the rear end of the rear stage insulating pipe 22, and the rear end sealing assembly 23 is used for sealing the piston between the mandrel 11 and the inner wall of the rear stage insulating pipe 22. The rear end seal assembly 23 may be externally disposed on the rear-stage heat insulating pipe 22, or may be internally disposed in the rear-stage heat insulating pipe 22:

referring to fig. 6 to 11, as an embodiment, the rear end sealing assembly 23 is externally disposed on the rear inner tube 222, and the rear end of the rear outer tube 221 is vacuum welded to the rear inner tube 222 after being shrunk. The rear end seal assembly 23 includes a rear end seal ring assembly and an extension pipe 233, and the extension pipe 233 is intended to extend the position of the rear end seal ring assembly rearward, avoiding interference between the rear end seal assembly 23 and the intake pipe 243 and the return pipe 25. In this embodiment, the front end of the extension pipe 233 is welded to the rear-section inner pipe 222, the rear-end sealing ring assembly is disposed at the rear end of the extension pipe 233, and the mandrel 11 passes through the extension pipe 233 and is in dynamic sealing connection with the rear-end sealing ring assembly. The rear end sealing ring assembly comprises two rear end sealing ring baffle plates 232 and a rear end sealing ring 231, the rear end sealing ring baffle plates 232 are fixed on the extension pipe 233, the two rear end sealing ring baffle plates 232 can be connected in a threaded fastening mode, an inner groove is formed between the two rear end sealing ring baffle plates 232, the rear end sealing ring 231 is fixedly embedded in the inner groove, and the two rear end sealing ring baffle plates 232 can be detachably connected to facilitate replacement of the rear end sealing ring 231. In this embodiment, the rear end seal ring 231 contacts with the outer wall of the mandrel 11, and the mandrel 11 is connected with the rear end seal ring 231 in a dynamic seal manner.

In the present embodiment, the air inlet pipe 243, the air return pipe 25 and the extension pipe 233 are all inserted into the rear end of the rear-section inner pipe 222, and the outer walls of the air inlet pipe 243, the air return pipe 25 and the extension pipe 233 are sealed with the rear-section inner pipe 222 by seamless welding:

in one embodiment, the rear-stage insulating pipe 22 has a rear end wall, three insertion holes are formed at intervals in the rear end wall for inserting the air inlet pipe 243, the air return pipe 25 and the extension pipe 233, and the air inlet pipe 243, the air return pipe 25 and the extension pipe 233 are respectively welded in one insertion hole without a gap.

As another embodiment, the rear end of the rear-stage insulating pipe 22 does not need to be provided with a rear end wall, and the rear end of the rear-stage insulating pipe 22, the outer walls of the intake pipe 243, the return pipe 25 and the extension pipe 233 and the inner wall of the rear-stage insulating pipe 22 are directly fixed by seamless welding, that is, the gap between the outer walls of the intake pipe 243, the return pipe 25 and the extension pipe 233 and the inner wall of the rear-stage insulating pipe 22 is filled with solder.

The structure that the air inlet pipe 243 and the air return pipe 25 are arranged side by side at the rear end of the rear-section heat insulation pipe 22 and are welded and sealed is suitable for the cryoablation needle with lower return air temperature.

Referring to fig. 12 to 14, as another embodiment, the rear end sealing assembly 23 is a rear end sealing ring assembly, the rear end sealing ring assembly is disposed in the rear section inner tube 222, and the mandrel 11 passes through the rear end sealing ring assembly and is in dynamic sealing connection with the rear end sealing ring assembly. In this embodiment, the rear end of the rear inner tube 222 of the rear insulation tube 22 is flared and vacuum welded to the rear outer tube 221, and the rear end of the rear inner tube 222 is flared and vacuum welded to the rear outer tube 221 and then extends rearward to ensure that the rear end of the rear inner tube 222 has sufficient space for the rear gasket 231 and the rear gasket retainer 232 to fit therein. 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 with the flared end of the rear section inner tube 222, the two rear end sealing ring baffles 232 are in threaded fit to fix the rear end sealing ring 231, the two rear end sealing ring baffles 232 can be connected in a threaded fastening manner, 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, and the mandrel 11 passes through the rear end sealing ring 231 and is connected with the rear end sealing ring 231 in a dynamic sealing manner.

In this embodiment, the rear end seal assembly 23 is plugged into the rear section flare of the rear section inner tube 222 and welded, which helps to reduce the length of the handle 26.

In this embodiment, two leading-out holes 2321 are formed in 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 leading-out holes 2321.

The utility model discloses in, can directly manually operate adjusting part 1, make it can be for the 2 motion of fixed part, also can indirectly operate adjusting part 1 through adjusting the driving lever, the utility model discloses do not specifically limit to this, this embodiment uses second kind embodiment as the example to explain in detail, and concrete structure is as follows:

the adjusting component 1 further includes an adjusting sleeve 14, the adjusting sleeve 14 is sleeved outside the rear-stage heat-insulating pipe 22, in this embodiment, a rear end face of the adjusting sleeve 14 is located behind the rear-stage heat-insulating pipe 22, a shift lever 143 is disposed on a side wall of the adjusting sleeve 14, a guide window 141 through which the air inlet pipe 243 and the air return pipe 25 can pass and a mandrel connecting hole 142 are disposed on the rear end face of the adjusting sleeve 14, the mandrel 11 passes through the mandrel connecting hole 142 and is fixedly connected with the mandrel connecting hole 142, and the fixed connection manner can be welding or threaded connection. The shift lever 143 is used to shift the adjustment member 1 forward or backward by hand, thereby adjusting the length of the target area 3.

In this embodiment, the fixing component 2 further includes a handle 26, the handle 26 is fixedly sleeved on the needle bar 21 or/and the rear-section heat-insulating pipe 22, the adjusting sleeve 14 is located in a gap between the handle 26 and the rear-section heat-insulating pipe 22, an adjusting groove 261 is provided on a side surface of the handle 26, and the shift lever 143 extends out of the adjusting groove 261, so as to facilitate shifting by a human hand. The handle 26 is not subjected to any pressure from the inside of the needle.

In the adjusting process of the target area 3, the driving lever 143 is manually moved to adjust the target area forward and backward, the driving lever 143 drives the whole adjusting part 1 to perform piston movement, and the J-T groove 241 and the mandrel 11 have certain flexibility, so that the problem that the target area cannot be adjusted due to the fact that the target area is not concentric with the needle head is solved. The rear end of the adjusting sleeve 14 is shown in a cross-section in fig. 8, and the air inlet pipe 243 and the air return pipe 25 penetrate through the guide window 141, so that the air inlet pipe 243 and the air return pipe 25 which are fixed in position during the adjusting process do not cause obstruction to the adjusting assembly. When the shortest target area 3 is adjusted, the whole adjusting assembly is positioned most forward relative to the fixing part 2, the length of the formed target area 3 is shortest, and the ice ball generated by corresponding freezing is also smallest; when the adjustment is carried out to the longest target area 3, the whole adjustment assembly is positioned at the most back relative to the fixing part 2, and the formed target area 3 has the longest length and is the largest corresponding to the ice ball generated by freezing.

Example 2

Referring to fig. 15 and 16, when the return air temperature of the cryoablation needle is not too low, the return air tube 25 may be sleeved on the air inlet pipe 243, fig. 11 shows a rear structure of the adjustable target region 3 of the cryoablation needle of this type, which is not shown in the drawings and is identical to fig. 9 and 10. The rear end of the rear-section inner tube 222 of the structure is in an open state, only the air inlet pipe 243 is fixedly connected with the rear-section inner tube 222, the air return pipe 25 is sleeved at the rear part of the handle 26, and the air inlet pipe 243 is located inside the air return pipe 25. The rear end sealing assembly 23 of the structure is a rear end sealing ring assembly which is fixed on the outer side of the rear end of the rear section heat insulation pipe 22, and the rear section heat insulation pipe 22 is in dynamic sealing connection with the adjusting sleeve 14 through the rear end sealing ring assembly.

Further, the rear end sealing ring subassembly includes two rear end sealing ring baffles 232 and rear end sealing ring 231, one rear end sealing ring baffle 232 is fixed to be set up on the outer wall of rear segment heat insulating pipe 22, two rear end sealing ring baffle 232 cooperates with fixedly rear end sealing ring 231 (two rear end sealing ring baffles 232 accessible screw fastening's mode is connected, forms an outer recess between two rear end sealing ring baffles 232, and rear end sealing ring 231 is fixed to be inlayed and is established on this outer recess), rear end sealing ring 231 with adjusting sleeve 14's inner wall contact and rather than the dynamic seal connection. The rear end seal 231 contacts the inside of the adjustment sleeve 14 and prevents return air from escaping forward from the gap between the adjustment sleeve 14 and the rear stage insulating tube 22. In the present embodiment, the rear end surface of the adjustment sleeve 14 is located behind the rear-stage heat insulation pipe 22, and the rear end surface of the adjustment sleeve 14 of this structure also includes a guide window 141 and a spindle connection hole 142, in which the spindle 11 is fixed in the spindle 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, the solution can be used for single-layer wall, i.e. only the inner tube 222 of the rear section is retained, the outer tube 221 of the rear section is removed, and the insulation of the handle 26 section is achieved only by adjusting the gap between the sleeve 14 and the inner tube 222 of the rear section.

Example 3

In order to monitor the working state 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 in the target area. As shown in fig. 17, the temperature measuring line 271 can be led out through the gap of the finned tube 242, the fixing member 22 of this embodiment further comprises an electric wire assembly 27, the electric wire assembly 27 comprises the temperature measuring line 271 and an electric wire leading-out tube 272, the temperature measuring point 2711 of the temperature measuring line 271 is placed at the foremost end of the J-T groove 241, the temperature measuring line 271 passes through the inside of the front-section inner tube 122, the air return groove 1331 and the gap of the finned tube 242 (the finned tube 242 is wound on the mandrel 11 at a certain pitch, the temperature measuring line 271 does not penetrate into the tube of the finned tube 242, but penetrates through the cylinder wound by the spiral finned tube 242) and the electric wire leading-out tube 272 in sequence, wherein the electric wire leading-out tube 272 is filled with glue to ensure that the gas in the needle does not leak out through the electric wire leading-out tube 272 while. The electric wire outlet tube 272 is welded to the rear end surface of the rear-stage inner tube 222 together with the air inlet tube 243, the air return tube 25 and the rear-end sealing component 23, and the four (the electric wire outlet tube 272, the air inlet tube 243, the air return tube 25 and the rear-end sealing component 23) are arranged in a sealing manner (for preventing return air from escaping forward from the rear end surface of the rear-stage inner tube 222), and the electric wire outlet tube 272, the air inlet tube 243 and the air return tube 25 together pass through the guide window 141. The structure of the scheme is complex, but the position of the temperature measuring point 2711 is fixed and does not change along with the adjustment of the target area. The extraction mode of the rewarming wire for realizing the rewarming function of the cryoablation needle is consistent with the extraction mode of the temperature measuring wire 271.

Example 4

The temperature measuring wire 271 can also be led out of the needle through the mandrel 11, as shown in fig. 18, the wire assembly 27 of this solution comprises only one temperature measuring wire 271, which is part of the adjusting part 1. The mandrel 11 of the scheme is a hollow pipe, a temperature measuring point 2711 of a temperature measuring line 271 is placed at the front end of the front-section inner pipe 122, the temperature measuring line 271 sequentially passes through the inside of the front-section inner pipe 12, the inside of the middle connecting pipe 133 and the outside of the mandrel 11 leading-out needle, and the inside of the mandrel 11 is filled with glue to prevent gas in the needle from leaking. The scheme is simple in structure, but the temperature measuring point 2711 can change along with the adjustment of the target area, and the longer the length of the target area is, the larger the difference between the temperature of the temperature measuring point 2711 and the central temperature of the target area 3 is. The extraction mode of the rewarming wire for realizing the rewarming function of the cryoablation needle is consistent with the extraction mode of the temperature measuring wire 271.

Example 5

For tumors which are approximately spherical or ellipsoidal, the length of a proper target area can be selected according to the size of the tumors to carry out cryoablation, but in actual clinical practice, the shape of the tumors is often irregular, for example, the pear-shaped tumors with large head ends and small tail ends can be used, and for the pear-shaped tumors, a single cryoablation needle with a long target area can be used for carrying out large-range ablation in clinical practice at present, so that a circle of normal tissues with more damage can be arranged in the middle of a pear, and two cryoablation needles with short target areas can be arranged in the front and back for freezing for different times to realize ablation, so that the cost and difficulty of an operation can be increased. If the cryoablation needle with the adjustable target area is used, precise conformal ablation of a single needle can be realized. Fig. 19 is an embodiment of a procedure for achieving "pear" shaped tumor cryoablation with shortest and longest target zones: the needle head is inserted from the tail end of the pear-shaped tumor 5 (the range shown by the thin dotted line) until the needle tip reaches the interior of the head end of the tumor, the target area is adjusted to the shortest length, and after the pear-shaped tumor is started to be frozen for a period of time, the head end of the tumor is primarily frozen by the ice hockey 6 (the range shown by the thick solid line). The target area is then adjusted to the maximum length and the freezing continues, the ice hockey 6 will freeze the head and tail of the tumor simultaneously, and finally the shape of the ice hockey 6 will conform to cover the "pear" shaped tumor 5.

The above disclosure is only for the purpose of describing several embodiments of the present application, but the present application is not limited thereto, and any variations that can be considered by those skilled in the art are intended to fall within the scope of the present application.

Claims (17)

1. A targeted-area-adjustable cryoablation needle comprising an adjustment member (1) and a fixation member (2), the adjustment member (1) being axially movable relative to the fixation member (2) to adjust the length of a targeted area (3):

the fixing component (2) comprises a needle bar (21), a rear-section heat insulation pipe (22), an air inlet pipe fitting (24) and an air return pipe (25), the rear end of the needle bar (21) is fixedly connected with the front end of the rear-section heat insulation pipe (22), and the needle bar (21) is communicated with the rear-section heat insulation pipe (22) to form an accommodating cavity; the air inlet pipe fitting (24) and the air return pipe (25) are inserted into the accommodating cavity from the rear end of the rear-section heat insulation pipe (22);

the adjusting component (1) comprises a front section heat insulation pipe (12) and a mandrel (11), and the front section heat insulation pipe (12) is axially arranged in the accommodating cavity in a sliding mode so as to adjust the length of the target area (3); the air inlet pipe fitting (24) penetrates through the front section heat insulation pipe (12) and extends into the needle rod (21); the mandrel (11) is inserted from the rear end of the rear-stage heat insulation pipe (22) and is interlocked with the front-stage heat insulation pipe (12).

2. The adjustable target area cryoablation needle as claimed in claim 1, wherein the needle shaft (21) is sleeved on the front section heat insulation pipe (12), and the outer wall of the front section heat insulation pipe (12) is in dynamic sealing connection with the inner wall of the rear section heat insulation pipe (22) through a front end sealing assembly (13).

3. The adjustable target area cryoablation needle of claim 2 wherein the forward seal assembly (13) comprises a forward seal ring assembly and an intermediate connecting tube (133), the forward seal ring assembly being disposed between an outer wall of the forward insulated tube (12) and an inner wall of the rearward insulated tube (22); the front end of the middle connecting pipe (133) is fixedly connected and communicated with the front section heat insulation pipe (12), and the rear end of the middle connecting pipe is fixedly connected with the mandrel (11).

4. The cryoablation needle with adjustable target area according to claim 3, wherein the front sealing ring assembly comprises a front sealing ring baffle and a front sealing ring, the front sealing ring baffle is fixedly sleeved on the front end of the middle connecting pipe (133) or/and the rear end of the front section heat insulation pipe (12), the front sealing ring baffle is provided with a groove for accommodating the front sealing ring, and the front sealing ring is fixedly arranged in the groove.

5. The adjustable target area cryoablation needle of claim 1 wherein the inner diameter of the posterior segment insulated tubing (22) is greater than the inner diameter of the needle shaft (21).

6. The cryoablation needle with the adjustable target area according to claim 3, wherein the air inlet pipe fitting (24) comprises a J-T groove (241), a finned tube (242) and an air inlet pipe (243), two ends of the finned tube (242) are fixedly connected and communicated with the J-T groove (241) and the air inlet pipe (243) respectively, and the finned tube (242) is wound outside the mandrel (11);

an air return groove (1331) is formed in the wall of the middle connecting pipe (133), and the J-T groove (241) penetrates into the front section heat insulation pipe (12) from the outside to the inside of the air return groove (1331) and extends to the front end of the needle rod (21).

7. The adjustable target area cryoablation needle of claim 1, wherein the fixation member (2) further comprises a back end sealing assembly (23), and the mandrel (11) and the back end heat insulation tube (22) are in dynamic sealing connection through the back end sealing assembly (23).

8. The adjustable target area cryoablation needle of claim 7, wherein the rear seal assembly (23) comprises two rear seal ring baffles (232) and a rear seal ring (231), one of the rear seal ring baffles (232) is fixedly disposed on the inner wall of the rear insulating tube (22), the two rear seal ring baffles (232) cooperate to fix the rear seal ring (231), and the mandrel (11) passes through the rear seal ring (231) and is in dynamic sealing connection therewith;

two leading-out holes (2321) are further formed in the rear end sealing ring baffle (232), and the air inlet pipe (243) and the air return pipe (25) are respectively fixed in one leading-out hole (2321).

9. The adjustable target area cryoablation needle of claim 7, wherein 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 communicated with the rear end surface of the rear section insulating tube (22), the rear end sealing ring assembly is arranged at the rear end of the extension tube (233), and the mandrel (11) penetrates through the extension tube (233) and is in dynamic sealing connection with the rear end sealing ring assembly.

10. The cryoablation needle with the adjustable target area as claimed in claim 7, wherein the rear end face of the rear section of the heat insulation pipe (22) is further provided with two lead-out holes (2321), and the air inlet pipe (243) and the air return pipe (25) are respectively fixed in one of the lead-out holes (2321).

11. The adjustable target area cryoablation needle of claim 9, wherein the rear seal ring assembly comprises two rear seal ring retainers (232) and a rear seal ring (231), one of the rear seal ring retainers (232) is fixedly disposed at the rear end of the extension tube (233), the two rear seal ring retainers (232) cooperate to secure the rear seal ring (231), and the mandrel (11) passes through the rear seal ring (231) and is in dynamic sealing connection therewith.

12. The cryoablation needle with the adjustable target area according to claim 1, wherein the adjusting member (1) further comprises an adjusting sleeve (14), the adjusting sleeve (14) is sleeved on the rear-section heat insulation tube (22), a shift lever (143) is fixedly arranged on the adjusting sleeve (14), a guide window (141) and a mandrel connecting hole (142) are formed in the rear end of the adjusting sleeve (14), and the mandrel (11) passes through the mandrel connecting hole (142) and is fixedly connected with the mandrel connecting hole (142).

13. The cryoablation needle with adjustable target area according to claim 12, wherein the fixing member (2) further comprises a handle (26), the handle (26) is fixedly sleeved on the needle shaft (21) or/and the rear-section heat insulation pipe (22), the adjusting sleeve (14) is positioned in a gap between the handle (26) and the rear-section heat insulation pipe (22), the handle (26) is provided with an adjusting groove (261), and the driving rod (143) extends out of the adjusting groove (261).

14. The cryoablation needle with adjustable target area according to claim 13, wherein the fixing member (2) further comprises a rear end sealing assembly (23), the rear end sealing assembly (23) comprises a rear end sealing ring assembly, the air return pipe (25) is sleeved on the rear end of the handle (26), the air inlet pipe (243) is located in the air return pipe (25), and the rear section of the heat insulation pipe (22) is movably and hermetically connected with the adjusting sleeve (14) through the rear end sealing ring assembly.

15. The adjustable target area cryoablation needle of claim 14 wherein the rear seal assembly comprises two rear seal ring baffles (232) and a rear seal ring (231), one of the rear seal ring baffles (232) being fixedly disposed on the outer wall of the rear section insulating tube (22), the two rear seal ring baffles (232) cooperating to secure the rear seal ring (231), the rear seal ring (231) contacting and being in dynamic sealing engagement with the inner wall of the adjustment sleeve (14).

16. The adjustable target area cryoablation needle according to claim 6, wherein the fixing part (2) further comprises a wire assembly (27), the wire assembly (27) comprises a temperature measuring wire (271) and a wire leading-out tube (272), the wire leading-out tube (272) is fixed at the rear end of the rear-section heat insulation tube (22), the temperature measuring wire (271) sequentially passes through the front-section heat insulation tube (12), the air return groove (1331), the gap of the finned tube (242) and the wire leading-out tube (272) to be led out of the needle, and the temperature measuring point (2711) of the temperature measuring wire (271) is located at the front section of the J-T groove (241).

17. The cryoablation needle with the adjustable target area according to claim 3, wherein the adjusting component (1) further comprises a temperature measuring wire (271), the mandrel (11) is a hollow tube, the temperature measuring wire (271) is led out of the needle through the front-section heat insulation tube (12), the middle connecting tube (133) and the mandrel (11) in sequence, and the temperature measuring point (2711) is located at the front end of the front-section heat insulation tube (12).

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