CN110604613A - Curved adjustable cryoablation needle - Google Patents
Curved adjustable cryoablation needle Download PDFInfo
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- CN110604613A CN110604613A CN201910751316.7A CN201910751316A CN110604613A CN 110604613 A CN110604613 A CN 110604613A CN 201910751316 A CN201910751316 A CN 201910751316A CN 110604613 A CN110604613 A CN 110604613A
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- pipe
- tube
- heat insulation
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- sealing ring
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- 238000009413 insulation Methods 0.000 claims abstract description 122
- 238000007789 sealing Methods 0.000 claims description 178
- 238000005452 bending Methods 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 206010028980 Neoplasm Diseases 0.000 description 15
- 238000002679 ablation Methods 0.000 description 11
- 230000008014 freezing Effects 0.000 description 11
- 238000007710 freezing Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 239000011229 interlayer Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 239000003292 glue Substances 0.000 description 6
- 235000014443 Pyrus communis Nutrition 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 208000001034 Frostbite Diseases 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000036592 analgesia Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036210 malignancy Effects 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00773—Sensed parameters
- A61B2018/00791—Temperature
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
- A61B2018/0231—Characteristics of handpieces or probes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
- A61B2018/0293—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques using an instrument interstitially inserted into the body, e.g. needle
Abstract
The invention relates to a bending type adjustable cryoablation needle, which comprises an adjusting part and a fixing part, wherein the adjusting part can move relative to the fixing part to adjust the length of a target area: 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-section heat insulation pipe is a bent 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 mandrel is inserted from the rear end of the rear-section heat insulation pipe and is fixedly connected with the front-section heat insulation pipe through the middle connecting pipe, the middle connecting pipe is arranged in the rear-section heat insulation pipe in a bendable manner, and the technical problems that treatment operation is complex and peripheral healthy tissues are easily injured due to fixation of a target area of the existing cryoablation needle are solved.
Description
Technical Field
The invention relates to a cryoablation needle, in particular to a bent adjustable cryoablation needle.
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.
Disclosure of Invention
The invention aims to provide a bent adjustable cryoablation needle, which solves the technical problems that the existing cryoablation needle is complex in treatment operation and easy to injure peripheral healthy tissues due to fixation of a target area.
In order to solve the above problems, the present invention provides a curved adjustable cryoablation needle comprising an adjustment member and a fixation member, the adjustment member being movable relative to the fixation member to adjust the length of a 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-section heat insulation pipe is a bent 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, and the front-section heat insulation pipe is axially arranged in the accommodating cavity in a sliding mode 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 mandrel is inserted from the rear end of the rear-section heat insulation pipe and is fixedly connected with the front-section heat insulation pipe through a middle connecting pipe, and the middle connecting pipe is arranged in the rear-section heat insulation pipe in a bendable manner.
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 the front end sealing assembly.
Preferably, the front end sealing assembly comprises a front end sealing ring assembly and the 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 through a connecting pipe fixing piece.
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;
the connecting pipe fixing piece is fixed at the rear end of the middle connecting pipe and is provided with an air return hole which is communicated with the middle connecting pipe and used for circulating air return and guiding the J-T groove to penetrate through and a mandrel front end connecting hole which is fixedly connected with the front end of the mandrel.
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 ring assembly comprises two rear-end sealing ring baffles and a rear-end sealing ring, one rear-end sealing ring baffle is fixedly arranged on the inner wall of the rear-end 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 rear-end connecting hole are formed in the rear end of the adjusting sleeve, and the rear end of the mandrel penetrates through the mandrel rear-end connecting hole and is fixedly connected with the mandrel rear-end 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 middle connecting pipe, the connecting pipe fixing piece, the gap of the finned pipe 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.
Preferably, the rear-section heat insulation pipe comprises a first straight pipe, an elbow pipe and a second straight pipe which are integrally connected, and the first straight pipe and the second straight pipe are respectively communicated with the front end and the rear end of the elbow pipe;
the front section heat insulation pipe is axially connected with the first straight pipe in a sliding manner;
the middle connecting pipe is a bendable pipe, and when the front section heat insulation pipe axially moves along the first straight pipe, the mandrel can axially move in the second straight pipe under the drive of the middle connecting pipe.
Preferably, the intermediate connecting pipe is a hypotube, a spiral slotted pipe or a corrugated pipe.
Compared with the prior art, the invention has the following technical effects:
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 leakage occurs, cold air can be discharged from a position far away from the patient and the hands of a doctor, and the safety of the operation is ensured;
7. 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.
8. The bending type hand-held operation is more comfortable due to the hand-held comfort of doctors.
9. The curved adjustable cryoablation needle is inserted under the guidance of CT, so that the interference between the extension tube behind the handle and the window when the curved adjustable cryoablation needle enters and exits the CT scanning window is avoided, and the extension tube behind the handle is basically horizontal after the curved cryoablation needle is inserted into a human body, so that the curved cryoablation needle cannot interfere with the window during CT scanning. Therefore, the bending adjustable cryoablation needle is more suitable for minimally invasive operations such as CT, nuclear magnetic resonance and the like.
10. Middle connecting pipe has the bendability, and the purpose is for the crooked shape of cooperation back end heat insulating tube, and the front end and the anterior segment heat insulating tube fixed connection of middle connecting pipe have ensured the target district and have adjusted the in-process, and middle connecting pipe flexible can also provide forward thrust or backward pulling force to the anterior segment heat insulating tube simultaneously.
Of course, it is not necessary for any product in which the invention is practiced 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 needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
FIG. 1 is a schematic view of a curved adjustable cryoablation needle according to the present invention;
FIG. 2 is a schematic view of the structure of an adjusting member according to the present invention;
FIG. 3 is a cross-sectional view A-A of an adjustment member of the present invention;
FIG. 4 is a schematic view of the front end seal assembly of the present invention;
FIG. 5 is a cross-sectional view B-B of the front end seal assembly of the present invention;
FIG. 6 is a schematic structural view of a curved adjustable cryoablation needle according to an embodiment of the external rear seal assembly of the present invention;
FIG. 7 is a schematic structural view of an embodiment of an outboard rear end seal assembly of the present invention;
FIG. 8 is a cross-sectional view C-C of one embodiment of an outboard rear end seal assembly of the present invention;
FIG. 9 is a schematic structural view of an embodiment of the shortest target area of the curved adjustable cryoablation needle of the present invention;
FIG. 10 is a schematic structural view of one embodiment of the longest target area of the curved adjustable cryoablation needle of the present invention;
FIG. 11 is a cross-sectional view D-D of one embodiment of the longest target area of the curved adjustable cryoablation needle of the present invention;
FIG. 12 is a partial schematic view of a curved adjustable cryoablation needle according to another embodiment of the external rear seal assembly of the present invention;
FIG. 13 is a schematic structural view of another embodiment of an outboard rear end seal assembly of the present invention;
FIG. 14 is a cross-sectional view E-E of another embodiment of the outboard rear end seal assembly of the present invention;
FIG. 15 is a partial schematic view of a cryoablation needle with an adjustable target area according to a third embodiment of the external rear seal assembly of the present invention;
FIG. 16 is a cross-sectional view F-F of a curved adjustable cryoablation needle according to a third embodiment of the external rear end seal assembly of 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 finned tube in the invention;
FIG. 18 is a schematic structural view of a temperature measuring line led out from a mandrel according to 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 present invention will be described in detail with reference to fig. 1 to 19, which illustrate a curved adjustable cryoablation needle according to the present invention, and the present invention is implemented on the premise of the technical solution of the present invention, and the detailed embodiment and the specific operation process 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 curved adjustable cryoablation needle without changing the spirit and content of the present invention.
Referring to fig. 1 to 19, a curved adjustable cryoablation needle comprises an adjusting member 1 and a fixing member 2, wherein the adjusting member 1 is movable relative to the fixing member 2 to form a target area 3 and an insulation area 4 with adjustable lengths on the outer surface of the ablation needle, and in the invention, the lengths of the target area 3 and the insulation area 4 are 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-section heat insulation pipe 22 is a bent pipe, 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 integrally 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 is disposed in the rear-stage insulating pipe 22 through a bendable intermediate connecting pipe 133, and the mandrel 11 is linked with the front-stage insulating pipe 12.
The present invention is not limited to any particular curved shape for the posterior segment insulating tubing 22, and the particular shape of the structure may be determined according to the particular surgical needs. If the front section of the rear section heat insulation pipe 22 is a straight pipe, the middle section is a bent pipe, and the rear section is a straight pipe; or the front section is a straight pipe, and the rear section is a bent pipe; or the front section is a bent pipe, and the rear section is a straight pipe; or the rear-section heat-insulating pipe 22 is only composed of at least one bent pipe, as long as the needle rod 21 is sleeved outside the front section of the front-section heat-insulating pipe 12 and slides axially with the front section heat-insulating pipe, and the front-section heat-insulating pipe 12 drives the mandrel 11 to move, so that the length of the target area 3 can be adjusted in the relative axial sliding process of the needle rod 21 and the front-section heat-insulating pipe 12.
The following detailed description is given with reference to the accompanying drawings as an example, but the present invention is not limited thereto.
Referring to fig. 1, the rear-stage insulating pipe 22 includes a first straight pipe 223, an elbow pipe 224 and a second straight pipe 225 which are integrally connected, and the first straight pipe 223 and the second straight pipe 225 are respectively communicated with the front end and the rear end of the elbow pipe 224;
the front section heat insulation pipe 12 is sleeved in the first straight pipe 223 and is axially connected with the first straight pipe 223 in a sliding manner;
the intermediate connecting pipe 133 is a bendable pipe, and when the front-stage insulating pipe 12 moves axially along the first straight pipe 223, the intermediate connecting pipe 133 drives the mandrel 11 to move axially in the second straight pipe 225. In the present invention, the middle connection pipe 133 may be made of a bendable material having a certain flexibility, such as a flexible material; a bendable structure may be adopted, for example, the middle connection pipe 133 is a hypotube, a spiral slotted tube, or a corrugated tube.
In this embodiment, it is preferable that the intermediate connection pipe 133 is a hypotube, a spiral grooved pipe, or a corrugated pipe, and the intermediate connection pipe 133 is flexible and can provide a pushing force forward or a pulling force backward.
The shape of the bent pipe 224 is not limited, and in this embodiment, the bent pipe 224 is an arc-shaped pipe, the bending angle of the arc-shaped pipe is 90 °, and the first straight pipe 223 is perpendicular to the second straight pipe 225.
Referring to fig. 3 to 5, the connecting pipe fixing member 134 is fixed at the rear end of the middle connecting pipe 133 and is communicated with the middle connecting pipe 133, the connecting pipe fixing member 134 is provided with an air return hole 1341 communicated with the middle connecting pipe 133 and used for circulating air return and guiding the air inlet pipe 24 to pass through, and a spindle front end connecting hole 1342 fixedly connected with the front end of the spindle 11, that is, at least two air return holes 1341 are formed in the connecting pipe fixing member 134, one is used for communicating with the air return pipe 25, the other is used for the air inlet pipe 24 to penetrate, and the air inlet pipe 24 penetrates from the air return hole 1341 and sequentially penetrates through the middle connecting pipe 133 and the front section heat insulation pipe 12 to the needle.
In this embodiment, the needle bar 21 is sleeved on the front section heat insulation pipe 12, the needle bar 21 and the front section heat insulation pipe 12 are both straight pipes, and the outer wall of the front section heat insulation pipe 12 is connected with the inner wall of the first straight pipe 223 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 the present embodiment, the front end of the front-stage heat insulation pipe 12 extends into the needle bar 21, the rear end thereof extends into the first straight pipe 223, the front-stage heat insulation pipe 12 is used for heat insulation of the rear stage 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-stage heat insulation pipe 12. The needle shaft 21 and the first straight tube 223 are welded or integrally formed in the axial direction, which is not particularly limited by the present invention, in order to prevent the needle shaft 21 from being ejected by high-pressure gas and also prevent low-temperature gas from leaking out at a position close to the 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 second straight pipe 225 and extends to the front end inside the needle bar 21 for conveying and throttling the 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 hole 1331, so that the adjusting part 1 cannot influence the position of the air inlet pipe fitting 24 in the adjusting process.
In this embodiment, during the adjustment of the target area 3, there is always a section of overlapping area between the front insulating pipe 12 and the first straight pipe 223, so that the cold can be prevented from being released from the middle position of the insulating area 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-stage insulating pipe 12 may be made of a heat insulating material, or may be made of a double-layer vacuum wall, but the invention is not limited thereto, and the double-layer vacuum wall is preferred in this embodiment, that is, the front-stage insulating pipe 12 includes a front-stage inner pipe 122 and a front-stage outer pipe 121, and a vacuum interlayer is formed between the front-stage inner pipe 122 and the front-stage 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 into the front section insulating pipe 12 and welded, and the rear end is fixedly connected to the mandrel 11 through a connecting pipe fixing member 134. 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 inner diameter of the first straight pipe 223 is larger than that of the needle bar 21, the front section heat insulation pipe 12 is always located in the first straight pipe 223 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 region 3, one section of overlapping region is always arranged between the front section heat insulation pipe 12 and the first straight pipe 223, and the two sections cannot be separated from each other, so that the cold energy can be prevented from being released from the middle position of the heat insulation region 4.
In this embodiment, the mandrel 11 is solid bar stock.
In this embodiment, the mandrel 11 and the second straight pipe 225 are connected in a dynamic sealing manner through the rear end sealing assembly 23.
The pipe wall of the rear-stage heat-insulating pipe 22 may be made of a heat-insulating material, or may also be made of a double-layer vacuum wall, and the present invention is not particularly limited thereto, and in this embodiment, a double-layer vacuum wall is preferred, that is, the pipe wall of the rear-stage heat-insulating pipe 22 is a double-layer vacuum wall, the rear-stage heat-insulating pipe 22 includes a rear-stage inner pipe 222 and a rear-stage outer pipe 221, and a vacuum interlayer is formed between the rear-stage inner pipe 222 and the rear-. 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 air return pipe 25 and the air inlet pipe 243 are inserted side by side into the rear end of the second straight pipe 225, and the rear end sealing assembly 23 is used for sealing the piston between the mandrel 11 and the inner wall of the second straight pipe 225. The rear end seal assembly 23 may be externally disposed on the second straight pipe 225, or may be internally disposed on the second straight pipe 225:
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 second straight pipe 225, 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 second straight tube 225 has a rear end wall, the rear end wall is provided with three insertion holes at intervals 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 gaps.
As another embodiment, the rear end of the second straight pipe 225 does not need to be provided with a rear end wall, and at the rear end of the second straight pipe 225, the air inlet pipe 243, the air return pipe 25 and the outer wall of the extension pipe 233 are directly fixed by seamless welding with the inner wall of the second straight pipe 225, that is, the gap between the outer wall of the air inlet pipe 243, the air return pipe 25 and the extension pipe 233 and the inner wall of the second straight pipe 225 is filled with solder.
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 embedded in the rear section (i.e. the second straight pipe 225) of the rear section insulating pipe 22, 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.
In the present invention, the adjusting component 1 may be directly and manually operated to be movable relative to the fixed component 2, or the adjusting component 1 may be indirectly operated through the adjusting lever, which is not specifically limited in the present invention, and the present embodiment is described in detail by taking the second embodiment as an example, and the specific structure is as follows:
the adjusting component 1 further includes an adjusting sleeve 14, the adjusting sleeve 14 is sleeved outside the rear-section heat-insulating pipe 22, in this embodiment, a rear end face of the adjusting sleeve 14 is located behind the second straight pipe 225, 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 rear-end connecting hole 142 are disposed on the rear end face of the adjusting sleeve 14, the mandrel 11 passes through the mandrel rear-end connecting hole 142 and is fixedly connected with the mandrel rear-end connecting hole 142, and the fixed connecting manner may 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 face of the adjusting sleeve 14 is located behind the rear-stage heat insulation pipe 22, and the rear end face of the adjusting sleeve 14 of this structure also includes a guide window 141 and a mandrel rear-end connecting hole 142, in which the mandrel 11 is fixed in the mandrel rear-end connecting 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-stage inner tube 122, the intermediate connecting tube 133, the connecting tube fixing member 134 and the gap of the finned tube 242 in sequence (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, wherein the electric wire leading-out tube 272 is filled with glue to ensure that the temperature measuring line 271 is led out, and at the same time. 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 bending type adjustable cryoablation needle is used, accurate 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 disclosure above is only one specific embodiment of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.
Claims (19)
1. A curved adjustable cryoablation needle comprising an adjustment member (1) and a fixation member (2), the adjustment member (1) being movable relative to the fixation member (2) for adjusting the length of a target area (3):
the fixing component (2) comprises a needle rod (21), a rear-section heat insulation pipe (22), an air inlet pipe fitting (24) and an air return pipe (25), the rear-section heat insulation pipe (22) is a bent pipe, the rear end of the needle rod (21) is fixedly connected with the front end of the rear-section heat insulation pipe (22), and the needle rod (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 section heat insulation pipe (22) and is fixedly connected with the front section heat insulation pipe (12) through a middle connecting pipe (133), and the middle connecting pipe (133) is arranged in the rear section heat insulation pipe (22) in a bendable manner.
2. The curved adjustable cryoablation needle as claimed in claim 1, wherein said needle shaft (21) is sleeved on said front section of heat insulation tube (12), and the outer wall of said front section of heat insulation tube (12) is connected with the inner wall of said rear section of heat insulation tube (22) in a dynamic sealing manner through said front end sealing assembly (13).
3. The curved adjustable cryoablation needle according to claim 2, wherein said forward sealing assembly (13) comprises a forward sealing ring assembly and said intermediate connecting tube (133), said forward sealing ring assembly being disposed between an outer wall of said forward insulated tube (12) and an inner wall of said 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 core shaft (11) through a connecting pipe fixing piece (134).
4. The curved adjustable cryoablation needle 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 secured to the front end of the middle connecting tube (133) or/and the rear end of the front insulating tube (12), the front sealing ring baffle has a groove for receiving the front sealing ring, and the front sealing ring is fixedly secured in the groove.
5. The curved adjustable cryoablation needle as defined in claim 1 wherein said rear section insulated tubing (22) has an inner diameter greater than an inner diameter of said needle shaft (21).
6. The bend-type adjustable cryoablation needle as claimed in 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);
the connecting pipe fixing piece (134) is fixed at the rear end of the middle connecting pipe (133), and the connecting pipe fixing piece (134) is provided with an air return hole (1341) which is communicated with the middle connecting pipe (133) and is used for circulating air return and guiding the J-T groove (241) to pass through and a mandrel front end connecting hole (1342) which is fixedly connected with the front end of the mandrel (11).
7. The curved adjustable cryoablation needle according to claim 1, wherein said fastening member (2) further comprises a rear end sealing assembly (23), and said mandrel (11) and said rear insulating tube (22) are movably and sealingly connected by said rear end sealing assembly (23).
8. The curved adjustable cryoablation needle according to claim 7, wherein said rear seal ring assembly comprises two rear seal ring baffles (232) and a rear seal ring (231), one of said rear seal ring baffles (232) being fixedly disposed on an inner wall of said rear insulating tube (22), said two rear seal ring baffles (232) cooperating to secure said rear seal ring (231), said mandrel (11) passing through said rear seal ring (231) and being in dynamic sealing engagement 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 curved adjustable cryoablation needle according to 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 connected to the rear end surface of the rear section insulating tube (22), the rear end sealing ring assembly is disposed 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 curved adjustable cryoablation needle as claimed in claim 7, wherein the rear end face of the rear-stage heat insulation tube (22) is further provided with two exit holes (2321), and the air inlet tube (243) and the air return tube (25) are respectively fixed in one of the exit holes (2321).
11. The curved adjustable cryoablation needle according to claim 9, wherein the rear sealing ring assembly comprises two rear sealing ring retainers (232) and a rear sealing ring (231), one of the rear sealing ring retainers (232) is fixedly disposed at the rear end of the extension tube (233), the two rear sealing ring retainers (232) cooperate to fix the rear sealing ring (231), and the core shaft (11) passes through the rear sealing ring (231) and is in dynamic sealing connection therewith.
12. The curved adjustable cryoablation needle according to claim 1, wherein the adjusting member (1) further comprises an adjusting sleeve (14), the adjusting sleeve (14) is sleeved on the rear-end insulating tube (22), a driving lever (143) is fixedly disposed on the adjusting sleeve (14), a guiding window (141) and a mandrel rear-end connecting hole (142) are formed in a rear end of the adjusting sleeve (14), and a rear end of the mandrel (11) passes through the mandrel rear-end connecting hole (142) and is fixedly connected to the mandrel rear-end connecting hole (142).
13. The curved adjustable cryoablation needle according to claim 12, wherein said fastening member (2) further comprises a handle (26), said handle (26) is fixedly disposed on said needle shaft (21) and/or said rear-stage heat-insulating tube (22), said adjusting sleeve (14) is disposed in a gap between said handle (26) and said rear-stage heat-insulating tube (22), said handle (26) is provided with an adjusting groove (261), and a driving rod (143) extends from said adjusting groove (261).
14. The curved adjustable cryoablation needle 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 tube (25) is sleeved on the rear end of the handle (26), the air inlet tube (243) is located in the air return tube (25), and the rear section of the thermal insulation tube (22) is movably and sealingly connected with the adjusting sleeve (14) through the rear end sealing ring assembly.
15. The curved adjustable cryoablation needle according to claim 14, wherein said rear seal ring assembly comprises two rear seal ring baffles (232) and a rear seal ring (231), one of said rear seal ring baffles (232) being fixedly disposed on the outer wall of said rear section insulating tube (22), said two rear seal ring baffles (232) cooperating to secure said rear seal ring (231), said rear seal ring (231) contacting and being in dynamic sealing engagement with the inner wall of said adjustment sleeve (14).
16. The curved adjustable cryoablation needle according to claim 6, wherein the fixing member (2) further comprises a wire assembly (27), the wire assembly (27) comprises a temperature measuring wire (271) and a wire outlet tube (272), the wire outlet tube (272) is fixed to the rear end of the rear-stage insulated tube (22), the temperature measuring wire (271) passes through the front-stage insulated tube (12), the middle connecting tube (133), the connecting tube fixing member (134), the gap between the finned tubes (242) and the wire outlet tube (272) in sequence, and the temperature measuring point (2711) of the temperature measuring wire (271) is located at the front stage of the J-T groove (241).
17. The curved adjustable cryoablation needle according to claim 6, wherein the adjusting member (1) further comprises a temperature measuring wire (271), the core shaft (11) is a hollow tube, the temperature measuring wire (271) is led out of the needle through the front-segment insulating tube (12), the middle connecting tube (133) and the core shaft (11) in sequence, and the temperature measuring point (2711) is located at the front end of the front-segment insulating tube (12).
18. The curved adjustable cryoablation needle according to claims 1 to 17, wherein the rear insulated tube (22) comprises a first straight tube (223), an elbow (224) and a second straight tube (225) which are integrally connected, wherein the first straight tube (223) and the second straight tube (225) are respectively communicated with the front end and the rear end of the elbow (224);
the front section heat insulation pipe (12) is axially connected with the first straight pipe (223) in a sliding manner;
the middle connecting pipe (133) is a bendable pipe, and when the front-section heat insulation pipe (12) axially moves along the first straight pipe (223), the mandrel (11) can axially move in the second straight pipe (225) under the driving of the middle connecting pipe (133).
19. The curved adjustable cryoablation needle according to claim 18, wherein said intermediate connecting tube (133) is a hypotube, a helically grooved tube or a corrugated tube.
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| CN201910751316.7A CN110604613A (en) | 2019-08-13 | 2019-08-13 | Curved adjustable cryoablation needle |
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| CN201910751316.7A CN110604613A (en) | 2019-08-13 | 2019-08-13 | Curved adjustable cryoablation needle |
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| CN111805478A (en) * | 2020-08-19 | 2020-10-23 | 许巧珍 | Processing equipment of adjustable cryoablation needle of curved |
| WO2021169800A1 (en) * | 2020-02-24 | 2021-09-02 | 上海导向医疗***有限公司 | Flow adjusting assembly and flow-adjustable flexible cryoprobe |
| CN113367789A (en) * | 2021-07-16 | 2021-09-10 | 成都安捷畅医疗科技有限公司 | Bending adjustable cryoprobe |
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