阅读说明：本技术 可调靶向区的冷冻消融针 (The cryoablation needle of adjustable targeting district ) 是由 杨迟 徐彬凯 吴银龙 常兆华 于 2019-08-13 设计创作，主要内容包括：本发明涉及一种可调靶向区的冷冻消融针,包括调节部件和固定部件,所述调节部件可相对于所述固定部件轴向运动以调节靶向区的长度：固定部件包括针杆、后段隔热管、进气管件和回气管,针杆的后端与后段隔热管的前端固定连接,针杆与后段隔热管相通并形成容置腔；进气管件和回气管均从后段隔热管的后端插入容置腔；调节部件包括前段隔热管和芯轴,前段隔热管轴向滑动设置在容置腔内以调节靶向区的长度；进气管件穿过前段隔热管并延伸至针杆内；芯轴从后段隔热管的后端插入并与前段隔热管联动,本发明解决了现有的冷冻消融针因靶向区固定而造成治疗操作复杂且易伤及周边健康组织的技术问题。(The present invention relates to a kind of cryoablation needles of adjustable targeting district, including regulating member and fixation member, the regulating member can be axially moved to adjust the length of targeting district relative to the fixation member: fixation member includes shank, back segment instlated tubular, air inlet pipe fitting and muffler, the rear end of shank is fixedly connected with the front end of back segment instlated tubular, and shank communicates with back segment instlated tubular and forms accommodating cavity；Air inlet pipe fitting and muffler are inserted into accommodating cavity from the rear end of back segment instlated tubular；Regulating member includes leading portion instlated tubular and mandrel, and leading portion instlated tubular slides axially the length for being arranged in and adjusting targeting district in accommodating cavity；Air inlet pipe fitting passes through leading portion instlated tubular and extends in shank；Mandrel is inserted into from the rear end of back segment instlated tubular and links with leading portion instlated tubular, and the present invention solves existing cryoablation needle and causes to treat complicated for operation and easy the technical issues of injuring periphery health tissues because targeting district is fixed.)

1. a kind of cryoablation needle of adjustable targeting district, which is characterized in that described including regulating member (1) and fixation member (2) Regulating member (1) can be axially moved to adjust the length of targeting district (3) relative to the fixation member (2):

The fixation member (2) includes shank (21), back segment instlated tubular (22), air inlet pipe fitting (24) and muffler (25), described The rear end of shank (21) is fixedly connected with the front end of the back segment instlated tubular (22), the shank (21) and the back segment instlated tubular (22) it communicates and forms accommodating cavity；The air inlet pipe fitting (24) and muffler (25) are from the rear end of the back segment instlated tubular (22) It is inserted into the accommodating cavity；

The regulating member (1) includes leading portion instlated tubular (12) and mandrel (11), and the leading portion instlated tubular (12), which slides axially, to be set Set the length that targeting district (3) are adjusted in the accommodating cavity；The air inlet pipe fitting (24) passes through the leading portion instlated tubular (12) And it extends in shank (21)；The mandrel (11) is from the insertion of the rear end of the back segment instlated tubular (22) and heat-insulated with the leading portion Manage (12) linkage.

2. the cryoablation needle of adjustable targeting district as described in claim 1, which is characterized in that the shank (21) is coated at institute It states on leading portion instlated tubular (12), passes through between the outer wall of the leading portion instlated tubular (12) and the inner wall of the back segment instlated tubular (22) Forward end seal component (13) the dynamic sealing connection.

3. the cryoablation needle of adjustable targeting district as claimed in claim 2, which is characterized in that the forward end seal component (13) Including forward end seal coil assembly and intermediate connection tube (133), the forward end seal coil assembly is arranged in the leading portion instlated tubular (12) between the inner wall of outer wall and the back segment instlated tubular (22)；The front end of the intermediate connection tube (133) and the leading portion Instlated tubular (12) is fixedly connected and communicates, and rear end is fixedly connected with the mandrel (11).

4. the cryoablation needle of adjustable targeting district as claimed in claim 3, which is characterized in that the forward end seal coil assembly packet Front end gear sealing ring baffle and forward end seal circle are included, the forward end seal circle baffle fixing sleeve is set to the intermediate connection tube (133) front end or/and leading portion instlated tubular (12) rear end, the forward end seal circle baffle, which is equipped with, accommodates the forward end seal circle Groove, the forward end seal circle is fixed in this groove.

5. the cryoablation needle of adjustable targeting district as described in claim 1, which is characterized in that the back segment instlated tubular (22) Internal diameter is greater than the internal diameter of the shank (21).

6. the cryoablation needle of adjustable targeting district as claimed in claim 3, which is characterized in that the air inlet pipe fitting (24) includes J-T slot (241), finned tube (242) and air inlet pipe (243), the both ends of the finned tube (242) respectively with the J-T slot (241) It is fixedly connected and communicates with air inlet pipe (243), the finned tube (242) is wound on the mandrel (11) outside；

It is offered return-air slot (1331) on the tube wall of the intermediate connection tube (133), the J-T slot (241) is returned from described in extroversion The front end of the shank (21) is pierced into the leading portion instlated tubular (12) and extended in air drain (1331).

7. the cryoablation needle of adjustable targeting district as described in claim 1, which is characterized in that the fixation member (2) is also wrapped It includes back-end sealing component (23), passes through the back-end sealing component between the mandrel (11) and the back segment instlated tubular (22) (23) dynamic sealing connects.

8. the cryoablation needle of adjustable targeting district as claimed in claim 7, which is characterized in that the back segment seal ring assembly packet Two back-end sealing circle baffles (232) and back-end sealing circle (231) are included, a back-end sealing circle baffle (232) is fixed at On the inner wall of the back segment instlated tubular (22), two back-end sealing circle baffle (232) cooperations are with the fixation back-end sealing circle (231), the mandrel (11) passes through the back-end sealing circle (231) and connect with its dynamic sealing；

It is also provided with two fairleads (2321) on the back-end sealing circle baffle (232), the air inlet pipe (243) and muffler (25) it is individually fixed in a fairlead (2321).

9. the cryoablation needle of adjustable targeting district as claimed in claim 7, which is characterized in that the back-end sealing component (23) Including back-end sealing coil assembly and extension (233), the fixed connection in the front end of the extension (233) is in the back segment instlated tubular (22) rear end face, in the rear end of the extension (233), the mandrel (11) passes through institute for the back-end sealing coil assembly setting It states extension (233) and is connect with the back-end sealing coil assembly dynamic sealing.

10. the cryoablation needle of adjustable targeting district as claimed in claim 7, which is characterized in that the back segment instlated tubular (22) Rear end face also open up two fairleads (2321), the air inlet pipe (243) and muffler (25) are individually fixed in an extraction In hole (2321).

11. the cryoablation needle of adjustable targeting district as claimed in claim 9, which is characterized in that the back-end sealing coil assembly Including two back-end sealing circle baffles (232) and back-end sealing circle (231), a back-end sealing circle baffle (232) is installed in institute The rear end of extension (233) is stated, two back-end sealing circle baffle (232) cooperations are with the fixation back-end sealing circle (231), institute Mandrel (11) are stated across the back-end sealing circle (231) and are connect with its dynamic sealing.

12. the cryoablation needle of adjustable targeting district as described in claim 1, which is characterized in that the regulating member (1) is also wrapped It includes an adjusting sleeve pipe (14), the back segment instlated tubular (22), the adjusting sleeve pipe (14) is sheathed on outside the adjusting sleeve pipe (14) A upper fixed driving lever (143), the rear end of the adjusting sleeve pipe (14) offer guidance window (141) and mandrel connecting hole (142), The mandrel (11) passes through the mandrel connecting hole (142) and is fixedly connected with the mandrel connecting hole (142).

13. the cryoablation needle of adjustable targeting district as claimed in claim 12, which is characterized in that the fixation member (2) is also Including handle (26), handle (26) fixation is set on the shank 21 or/and back segment instlated tubular 22, the adjusting sleeve pipe (14) in the gap between the handle (26) and the back segment instlated tubular (22), the handle (26) is equipped with regulating tank (261), driving lever (143) is stretched out from the regulating tank (261).

14. the cryoablation needle of adjustable targeting district as claimed in claim 13, which is characterized in that the fixation member (2) is also Including back-end sealing component (23), the back-end sealing component (23) includes back-end sealing coil assembly, muffler (25) set It is located at the rear end of the handle (26), the air inlet pipe (243) is located in the muffler (25), the back segment instlated tubular (22) It is connect between the adjusting sleeve pipe (14) by the back-end sealing coil assembly dynamic sealing.

15. the cryoablation needle of adjustable targeting district as claimed in claim 14, which is characterized in that the back-end sealing coil assembly Including two back-end sealing circle baffles (232) and back-end sealing circle (231), back-end sealing circle baffle (232) fixed setting On the outer wall of the back segment instlated tubular (22), two back-end sealing circle baffle (232) cooperations are with the fixation back-end sealing It encloses (231), the back-end sealing circle (231) contacts with the inner wall of the adjusting sleeve pipe (14) and connect with its dynamic sealing.

16. the cryoablation needle of adjustable targeting district as claimed in claim 6, which is characterized in that the fixation member (2) is also wrapped It includes wire component (27), the wire component (27) includes thermometric line (271) and electric wire fairlead (272), and the electric wire is drawn Pipe (272) is fixed on the rear end of the back segment instlated tubular (22), the thermometric line (271) sequentially pass through leading portion instlated tubular (12), Return-air slot (1331), the gap of finned tube (242) and electric wire fairlead (272) are drawn outside needle, the thermometric of the thermometric line (271) Point (2711) is located at the leading portion of the J-T slot (241).

17. the cryoablation needle of adjustable targeting district as claimed in claim 3, which is characterized in that the regulating member (1) is also wrapped Include thermometric line (271), the mandrel (11) be hollow tubular product, the thermometric line (271) sequentially pass through leading portion instlated tubular (12), in Between connecting tube (133), mandrel (11) lead to outside needle, the temperature measuring point (2711) is located at the front end of leading portion instlated tubular (12).

Technical field

The present invention relates to cryoablation needle, in particular to the cryoablation needle of adjustable targeting district.

Background technique

Cryoablation is a kind of therapeutic modality that pathological tissues are destroyed using low temperature, it is considered to be a kind of to treat pernicious swell Efficient, the invasive methods of tumor.Cryoablation technical operation simplicity, few intercurrent disease, effectively analgesia, moreover, the ice hockey that ablation is formed Sharpness of border, convenient for observation, can the ablation of safety close on the lesion of big blood vessel or important organ.Cryoablation can also take spininess The mode of freezing keeps ablation range bigger, is suitable for big lesion and form Irregular focus.

Targeting district (i.e. effective freeze space) is located at the syringe needle leading portion of cryoablation needle, and length determines the big of freezing range Small, targeting district is longer, and the ice hockey for freezing formation is bigger.But the targeting district of existing cryoablation needle is mostly fixed structure, The size of its ice hockey generated is also fixation, and in clinical application, doctor need to select different targeting districts according to the size of lesion The cryoablation needle of length.For pathological tissues in irregular shape, the probe using a variety of different sizes is needed, it is reciprocal to carry out Repeatedly treatment operation, and easily injure periphery health tissues.Such as " pears " shape tumour small for the big tail end of head end, it is clinical at this stage In can be used it is single the cryoablation needle of long targeting district is melted on a large scale, but in this way can the middle part of " pears " one enclose damage compared with More normal tissues；Can also front and back place the cryoablation needle freezing different time of two short targeting districts to realize ablation, but It will increase the expense and difficulty of operation in this way.

Summary of the invention

The purpose of the present invention is to provide a kind of cryoablation needles of adjustable targeting district, to solve existing cryoablation needle It causes to treat complicated for operation and easy the technical issues of injuring periphery health tissues because targeting district is fixed.

To solve the above-mentioned problems, the present invention provides a kind of cryoablation needles of adjustable targeting district, including regulating member And fixation member, the regulating member can be axially moved to adjust the length of targeting district relative to the fixation member:

The fixation member includes shank, back segment instlated tubular, air inlet pipe fitting and muffler, the rear end of the shank with it is described The front end of back segment instlated tubular is fixedly connected, and the shank communicates with the back segment instlated tubular and forms accommodating cavity；The air inlet pipe Part and muffler are inserted into the accommodating cavity from the rear end of the back segment instlated tubular；

The regulating member includes leading portion instlated tubular and mandrel, and the leading portion instlated tubular, which slides axially, to be arranged in the accommodating It is intracavitary that with the length that adjusts targeting district, (leading portion instlated tubular can be stretched in shank, the front end of leading portion instlated tubular and the front end of needle point Between vertical range be targeting district length)；The air inlet pipe fitting passes through the leading portion instlated tubular and extends in shank；Institute Mandrel is stated to be inserted into from the rear end of the back segment instlated tubular and link with the leading portion instlated tubular.

Preferably, the shank is coated on the leading portion instlated tubular, the outer wall and the back segment of the leading portion instlated tubular It is connected between the inner wall of instlated tubular by the forward end seal component dynamic sealing.

Preferably, the forward end seal component includes forward end seal coil assembly and intermediate connection tube, the forward end seal circle Component is arranged between the outer wall of the leading portion instlated tubular and the inner wall of the back segment instlated tubular；The front end of the intermediate connection tube It is fixedly connected and communicates with the leading portion instlated tubular, rear end is fixedly connected with the mandrel.

Preferably, the forward end seal coil assembly includes that front end gear sealing ring baffle and forward end seal circle, the front end are close Seal baffle fixing sleeve is set to the front end or/and leading portion instlated tubular rear end of the intermediate connection tube, the forward end seal circle baffle It is equipped with the groove for accommodating the forward end seal circle, the forward end seal circle is fixed in this groove.

Preferably, the internal diameter of the back segment instlated tubular is greater than the internal diameter of the shank.

Preferably, the air inlet pipe fitting includes J-T slot, finned tube and air inlet pipe, the both ends of the finned tube respectively with institute It states J-T slot to be fixedly connected and communicate with air inlet pipe, the finned tube is wound on outside the mandrel；

Return-air slot is offered on the tube wall of the intermediate connection tube, the J-T slot pierces into institute out of export-oriented the return-air slot State in leading portion instlated tubular and extend to the front end of the shank.

Preferably, the fixation member further includes back-end sealing component, lead between the mandrel and the back segment instlated tubular Cross the back-end sealing component dynamic sealing connection.

Preferably, the back segment seal ring assembly includes two back-end sealing circle baffles and back-end sealing circle, a rear end Sealing ring baffle is fixed on the inner wall of the back segment instlated tubular, and the two back-end sealing circle baffle fits are described in fixation Back-end sealing circle, the mandrel pass through the back-end sealing circle and connect with its dynamic sealing；

Two fairleads are also provided on the back-end sealing circle baffle, the air inlet pipe and muffler are individually fixed in an institute It states in fairlead.

Preferably, the back-end sealing component includes back-end sealing coil assembly and extension, the front end of the extension is solid In the rear end face of the back segment instlated tubular, the rear end of the extension is arranged in the back-end sealing coil assembly, described for fixed connection Mandrel passes through the extension and connect with the back-end sealing coil assembly dynamic sealing.

Preferably, the rear end face of the back segment instlated tubular also opens up two fairleads, the air inlet pipe and muffler are solid respectively Due in a fairlead.

Preferably, the back-end sealing coil assembly includes two back-end sealing circle baffles and back-end sealing circle, a rear end Sealing ring baffle is installed in the rear end of the extension, and the two back-end sealing circle baffle fits are with the fixation back-end sealing Circle, the mandrel pass through the back-end sealing circle and connect with its dynamic sealing.

Preferably, the regulating member further includes an adjusting sleeve pipe, it is heat-insulated to be sheathed on the back segment outside the adjusting sleeve pipe It manages, a fixed driving lever on the adjusting sleeve pipe, the rear end of the adjusting sleeve pipe offers guidance window and mandrel connecting hole, described Mandrel passes through the mandrel connecting hole and is fixedly connected with the mandrel connecting hole.

Preferably, the fixation member further includes handle, the handle fixation is set in the shank or/and back segment is heat-insulated Guan Shang, in the gap between the handle and the back segment instlated tubular, the handle is equipped with to be adjusted the adjusting sleeve pipe Slot, driving lever are stretched out from the regulating tank.

Preferably, the fixation member further includes back-end sealing component, the back-end sealing component includes back-end sealing circle Component, the muffler are set in the rear end of the handle, and the air inlet pipe is located in the muffler, the back segment instlated tubular It is connect between the adjusting sleeve pipe by the back-end sealing coil assembly dynamic sealing.

Preferably, the back-end sealing coil assembly includes two back-end sealing circle baffles and back-end sealing circle, a rear end Sealing ring baffle is fixed on the outer wall of the back segment instlated tubular, and the two back-end sealing circle baffle fits are described in fixation Back-end sealing circle, the back-end sealing circle are contacted with the inner wall of the adjusting sleeve pipe and are connect with its dynamic sealing.

Preferably, the fixation member further includes wire component, the wire component includes thermometric line and electric wire fairlead, The electric wire fairlead is fixed on the rear end of the back segment instlated tubular, the thermometric line sequentially pass through leading portion instlated tubular, return-air slot, The gap of finned tube and electric wire fairlead are drawn outside needle, and the temperature measuring point of the thermometric line is located at the leading portion of the J-T slot.

Preferably, the inside of the electric wire fairlead, which fills, sets glue, the thermometric line is drawn by glue and the electric wire Seal of tube connection.

Preferably, the regulating member further includes thermometric line, the mandrel is hollow tubular product, and the thermometric line sequentially passes through Leading portion instlated tubular, intermediate connection tube, mandrel are led to outside needle, and the temperature measuring point is located at the front end of leading portion instlated tubular.

Preferably, the inside of the mandrel, which fills, is equipped with glue, the thermometric line is connect by glue with the stem seal.

Preferably, the tube wall of the back segment instlated tubular be double-layer vacuum wall, the back segment instlated tubular include back segment inner tube and Back segment outer tube forms vacuum interlayer between the back segment inner tube and back segment outer tube.

Preferably, the tube wall of the leading portion instlated tubular be double-layer vacuum wall, the leading portion instlated tubular include leading portion inner tube and Leading portion outer tube forms vacuum interlayer between the leading portion inner tube and leading portion outer tube.

Compared with prior art, there are following technical effects by the present invention:

1, the length adjustment that targeting district is realized using the method for mandrel linkage leading portion instlated tubular is solved existing freezing and disappeared Melt needle to cause to treat complicated for operation and easy the technical issues of injuring periphery health tissues because targeting district is fixed；

2, it is securely welded between shank and back segment instlated tubular, can avoid shank and projected by high pressure gas, be also prevented from low temperature gas Body leaks in the position close to patient；Back segment instlated tubular is located at the hand steered position held of doctor, can prevent frostbite, and avoid cooling capacity stream It loses；

3, the adjusting of targeting district need to only be completed from syringe needle rear operating, it is not necessary that shank and back segment instlated tubular are separated from each other, It is securely welded between shank and rear end instlated tubular, effectively avoids causing shank to be penetrated by high pressure gas since return gas channel blocks Out；

4, forward end seal component is placed in needle, when for avoiding sealing ring from failing, causes frostbite to patient or doctor；

5, back-end sealing component is located at syringe needle rear portion, for preventing outside return-air airflow leaks to needle；

6, forward end seal component is located inside needle, and back-end sealing component is located at syringe needle rear portion, once seal failure and occur Leakage, cold air can only be discharged from the position far from patient and doctor's hand, not will cause frostbite, it is ensured that the safety of operation；

7, using the method for mandrel linkage leading portion instlated tubular, existing adjustable targeting district cryoablation needle is solved using outer Reveal the method for (leading portion) instlated tubular and caused by the too long problem of (leading portion) instlated tubular.Leading portion instlated tubular is always positioned in shank Portion, can effectively shorten the length of leading portion instlated tubular, and then return-air is more smooth, and the back pressure in shank is lower, and the temperature of syringe needle is lower, It is better to freeze performance；

8, during targeting district is adjusted, there is one section of overlapping in leading portion instlated tubular and back segment instlated tubular always between each other Region can release to avoid cooling capacity from the middle position of thermal insulation areas in this way.

Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Attached drawing be briefly described, it is therefore apparent that drawings in the following description are only some embodiments of the invention, for ability For field technique personnel, without creative efforts, it is also possible to obtain other drawings based on these drawings.It is attached In figure:

Fig. 1 is a kind of schematic diagram of the cryoablation needle of adjustable targeting district of the present invention；

Fig. 2 is the structural schematic diagram of regulating member in the present invention；

Fig. 3 is the cross-sectional view A-A of regulating member in the present invention；

Fig. 4 is the structural schematic diagram of forward end seal component in the present invention；

Fig. 5 is the cross-sectional view B-B of forward end seal component in the present invention；

Fig. 6 is the structure of the cryoablation needle of the adjustable targeting district for the embodiment that present invention China and foreign countries postpone end seal assembly Schematic diagram；

Fig. 7 is the structural schematic diagram for the embodiment that present invention China and foreign countries postpone end seal assembly；

Fig. 8 is the cross-sectional view C-C for the embodiment that present invention China and foreign countries postpone end seal assembly；

Fig. 9 is a kind of structural representation of an embodiment of the most short targeting district of the cryoablation needle of adjustable targeting district of the present invention Figure；

Figure 10 is that a kind of structure of an embodiment of the longest targeting district of the cryoablation needle of adjustable targeting district of the present invention is shown It is intended to；

Figure 11 is a kind of section view of an embodiment of the longest targeting district of the cryoablation needle of adjustable targeting district in the present invention Scheme D-D；

Figure 12 is the cryoablation needle of the adjustable targeting district for another embodiment that present invention China and foreign countries postpone end seal assembly Partial structural diagram；

Figure 13 is the structural schematic diagram for another embodiment that present invention China and foreign countries postpone end seal assembly；

Figure 14 is the cross-sectional view E-E for another embodiment that present invention China and foreign countries postpone end seal assembly；

Figure 15 is the cryoablation needle of the adjustable targeting district for the third embodiment that present invention China and foreign countries postpone end seal assembly Partial structural diagram；

Figure 16 is the cryoablation needle of the adjustable targeting district for the third embodiment that present invention China and foreign countries postpone end seal assembly Cross-sectional view F-F；

Figure 17 is the implementable structural schematic diagram that thermometric line is drawn in finned tube gap in the present invention；

Figure 18 is the structural schematic diagram that mandrel draws thermometric line in the present invention；

Figure 19 is the process signal of adjustable conformal ablation " pears " shape tumour of targeting district cryoablation needle in the present invention.

Specific embodiment

It is detailed to a kind of cryoablation needle progress of adjustable targeting district provided by the invention below with reference to Fig. 1 to Figure 19 Description, the present embodiment implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and specific Operating process, but protection scope of the present invention is not limited to following embodiments, and those skilled in the art are not changing essence of the invention In the range of mind and content, can it be modified and be polished.

Fig. 1 to Figure 19, a kind of cryoablation needle of adjustable targeting district, including regulating member 1 and fixation member 2 are please referred to, The regulating member 1 can be moved relative to the fixation member 2 with the adjustable targeting district 3 of outer surface formation length in ablation needle With thermal insulation areas 4, in the present invention, the length of targeting district 3 and thermal insulation areas 4 is adjustable:

The fixation member 2 includes shank 21, back segment instlated tubular 22, air inlet pipe fitting 24 and muffler 25, the shank 21 Rear end be fixedly connected with the front end of the back segment instlated tubular 22, the shank 21 is communicated and is formed with the back segment instlated tubular 22 Accommodating cavity；The air inlet pipe fitting 24 and muffler 25 are inserted into the accommodating cavity from the rear end of the back segment instlated tubular 22；

The regulating member 1 includes leading portion instlated tubular 12 and mandrel 11, and the leading portion instlated tubular 12, which slides axially to be arranged, to exist The length of targeting district 3 is adjusted in the accommodating cavity；The air inlet pipe fitting 24 passes through the leading portion instlated tubular 12 and extends to needle In bar 21；The mandrel 11 is inserted into from the rear end of the back segment instlated tubular 22 and links with the leading portion instlated tubular 12.

In the present embodiment, the shank 21 is coated on the leading portion instlated tubular 12, outside the leading portion instlated tubular 12 It is connected between wall and the inner wall of the back segment instlated tubular 22 by 13 dynamic sealing of forward end seal component.Leading portion instlated tubular 12 Between front end face and the needle point front end of shank 21 ablation needle outer surface formed region be targeting district 3, this region is effective Freeze region.The region formed between the front end of leading portion instlated tubular 12 and the rear end of back segment instlated tubular 22 in the outer surface of ablation needle For thermal insulation areas 4, this thermal insulation areas 4 can prevent normal tissue frostbite.In the present embodiment, mandrel 11, leading portion instlated tubular 12 and front end 13 three of seal assembly is integrated front and back and does piston motion to adjust the length of targeting district 3 and thermal insulation areas 4.

In the present embodiment, the front end of leading portion instlated tubular 12 is protruded into shank 21, and rear end is protruded into back segment instlated tubular 22, preceding Section instlated tubular 12 is heat-insulated for 21 back segment of shank, and forward end seal component 13 is axial piston sealing structure, for preventing return-air Gap of the air-flow between shank 21 and leading portion instlated tubular 12 passes through.Shank 21 and back segment instlated tubular 22 are axially solderable or one Body formed, the present invention is to this and is not particularly limited, it is therefore an objective to be avoided shank 21 from being projected by high pressure gas, be also prevented from cryogenic gas It leaks in the position close to patient.Back segment instlated tubular 22 is located at the hand steered position held of doctor, can prevent frostbite, and avoid cooling capacity stream It loses.

Fixation member 2 further includes back-end sealing component 23, and back-end sealing component 23 is also axial piston sealing structure, after this End seal assembly 23 is for preventing outside return-air airflow leaks to needle.

Air inlet pipe fitting 24 is inserted into from the rear end of back segment instlated tubular 22, and extends to the front end inside shank 21, is used for High pressure gas is conveyed and is throttled to targeting district 3, the gas after throttling is after 3 released cold quantity of targeting district again through leading portion instlated tubular 12 Outside 25 discharging pin of muffler.Specifically, air inlet pipe fitting 24 includes J-T slot 241, finned tube 242 and air inlet pipe 243, the wing The both ends of piece pipe 242 are welded and are connected to the J-T slot 241 and air inlet pipe 243 respectively, and the finned tube 242 is with certain spiral shell Away from being wound on outside the mandrel 11, J-T slot 241 is passed through from return-air slot 1331, so that regulating member 1 will not in adjustment process Influence the position of air inlet pipe fitting 24.

In the present embodiment, in the adjustment process of targeting district 3, leading portion instlated tubular 12 and back segment instlated tubular 22 it is mutual it Between always exist one section of overlapping region, can thus be discharged to avoid cooling capacity from the middle position of thermal insulation areas 4.

In the present embodiment, forward end seal component 13 is located inside needle, and back-end sealing component 23 is located at needle rear end, once hair Raw leakage, cold air can only be discharged from the position far from patient and doctor's hand, it is ensured that the safety of operation.

The cryoablation needle being inserted into side by side for muffler 25 and air inlet pipe 243 in back segment instlated tubular 22, back-end sealing group Part 23 for the piston seal between 22 inner wall of mandrel 11 and back segment instlated tubular, back-end sealing component 23 external to back segment every Heat pipe 22 is also built-in in back segment instlated tubular 22.

The cryoablation needle of air inlet pipe 243 is coated at for muffler 25, back-end sealing component 23 is used for back segment instlated tubular Piston seal between 22 and adjusting sleeve pipe 14, back-end sealing component 23 are placed outside the rear end of back segment instlated tubular 22.

Below in conjunction with attached drawing, lifts several specific embodiments and be described in detail.