CN207870951U - A kind of cryoablation conduit - Google Patents

Abstract

The utility model is related to a kind of cryoablation conduits, including supply unit and freezing unit, the supply unit includes sheath and axially disposed circulation loop in the sheath, the freezing unit is arranged on the distal portions of the sheath, the freezing unit includes sacculus and directional curvature part, the distal portions of the circulation loop are arranged in the sacculus, the distal end of the circulation loop is fixedly connected with the distal end of the sacculus, the directional curvature part is socketed on the distal portions of the circulation loop, the change in shape of the sacculus drives the directional curvature part bending, so that the spacing-controllable of the circulation loop and the sacculus inner wall；It is avoided that sacculus inner direct refrigerant, effectively controls the rate of temperature fall and cryogenic temperature in cryoablation region, improve the freezing performance of cryoablation conduit.

Description

A kind of cryoablation conduit

Technical field

The utility model belongs to cryoablation field, and in particular to a kind of cryoablation conduit.

Background technology

With China's life-time dilatation per capita, senile hypertension illness rate up to 40%~60%, although at present safely, have The drug of effect is more and more, but the current treatment status of hypertension is still poor.It was announced according to 2006《Chinese cardiovascular disease report 2005》Statistics indicate that at present China's Hypertensive Population awareness, treatment rate and control rate respectively be only 30.6%, 24.7%, 6.1%, hypertension prevention and control work in China's is also in reduced levels, therefore the timely and effective treatment of hypertension is that a whole society need to The problem of paying close attention to jointly.Prevent according to the U.S., detection, assess and 2003 the 7th time report of the treatment hypertension Joint National committee It accuses (JNC7), there is hypertensive patient 1,000,000,000 or so in the current whole world, more in rising trend in recent years.Especially for intractable height The treatment of blood pressure is particularly urgent, and resistant hypertension refers to taking the antihypertensive drugs of three kinds or more (including diuretics) together When also change life style, but hypertension of the blood pressure still above or equal to 140/90mmHg.Resistant hypertension is old in being Year most common angiocardiopathy of people, is to lead to coronary heart disease, cerebral apoplexy, congestive heart failure, renal failure, aortic aneurysm Etc. important risk factors and the middle-aged and the old are lethal, the first cause disabled.

Research shows that：Renal sympathetic nerve discharge (renal sympathetic nerve activity, RSNA) can cause Renal tubule sodium fluid reabsorption increases, renin release and renal vascular resistance is caused to change, to make blood pressure increase.And it is handed over by kidney Afferent nerve is felt by the reflection signal transduction of kidney receptor to maincenter, then blood pressure is adjusted by renal sympathetic efferent nerve. RSNA can not only adjust the variation of arteria renalis antiotasis, and long-term an important factor for maintaining hypertension in short term.Therefore, using kidney Artery cryoablation conduit carries out arteria renalis sympathetic nerve ablation, is a kind of to treat high blood for obstinate hypertension The new hope of pressure, while being also a new method of non-drug therapy hypertension, this is shown according to the clinical test of external early period Method is safe and effective and can be widely used, and hypertensive patient can also be made to break away from the puzzlement of daily drug administration.

Chinese patent CN201520045658 has the cryoablation foley's tube of guidewire lumen, and basic principle is to pass through ball It is encapsulated the stifled arteria renalis, blocking blood flow, then by the helical structure released cold quantity of intermediate region in sacculus, to reach to the arteria renalis It is melted, although the conduit can carry out cryoablation to the arteria renalis, needs to block the arteria renalis and blocking blood flow to improve The freezing performance of conduit, there is a possibility that kidney causes ischemic necrosis if blocking time is long.

Mostly in existing cryoablation product is outside centered on low-temperature receiver in sacculus inner direct refrigerant or sacculus The structure of diffusion, but this structure of sacculus inner direct refrigerant is easy to keep sacculus explosion, danger coefficient too high；And sacculus Interior too slow to the structure rate of temperature fall of external diffusion centered on low-temperature receiver, cold consumption is too big.

Invention content

In view of the drawbacks described above of the prior art, the technical problem to be solved by the utility model is to provide a kind of cryoablations Conduit, this cryoablation conduit avoid refrigerant and inject directly in sacculus, but by balloon features variation drive It is equipped with the circulation line bending of directional curvature part so that spacing of the circulation loop apart from sacculus inner wall is adjustable.

Technical solution adopted by the utility model to solve its technical problems is：

A kind of cryoablation conduit, including supply unit and freezing unit, the supply unit include sheath and described Axially disposed circulation loop in sheath, the freezing unit are arranged on the distal portions of the sheath, and the freezing is single Member includes sacculus and directional curvature part, and the distal portions of the circulation loop are arranged in the sacculus, the circulation loop Distal end be fixedly connected with the distal end of the sacculus, the directional curvature part is socketed in the distal portions of the circulation loop On, the change in shape of the sacculus drives the directional curvature part bending so that the circulation loop and the sacculus inner wall Spacing-controllable.

The utility model solves further technical solution used by its technical problem：

In one embodiment, the directional curvature part is the stainless steel tube or NiTi pipe of unilateral joint-cutting, the unilateral side Joint-cutting is arranged on the side towards the sacculus geometric center.

In one embodiment, the directional curvature part is spring ring, and the middle section of the spring ring is described in Sacculus geometric center side is fixed on the circulation loop.

In one embodiment, it is provided in the distal end of the directional curvature part and/or proximal end and adjusts curved bolster.

In one embodiment, the curved bolster is spring or macromolecule hose.

In one embodiment, the circulation loop includes multigroup input pipe and efferent duct, input pipe described in every group and The distal end of the efferent duct connects, and forms a n shapes circuit, the interlaced setting in distal end in multiple n shapes circuits.

In one embodiment, the circulation loop includes input pipe and efferent duct, and the distal end of the circulation loop is set Multi-channel pipe is set, the multi-channel pipe is fixedly connected with the distal end of the sacculus, and the input pipe is defeated with the multi-channel pipe The delivery outlet of inlet seal, the efferent duct and the multi-channel pipe seals.

In one embodiment, the circulation loop includes input pipe and efferent duct, and the distal end of the circulation loop is set Cooling capacity exchanging element is set, the distal end of the Cooling capacity exchanging element is blocked, distal end and the sacculus of the Cooling capacity exchanging element Distal end be fixedly connected, the proximal end of the Cooling capacity exchanging element distal seal with the input pipe and the efferent duct respectively.

In one embodiment, the supply unit further includes liquid injection pipe, and proximal end and the topping-up pump of the liquid injection pipe connect Logical, the distal end of the liquid injection pipe is in fluid communication with the sacculus, and the heat-conducting medium in the topping-up pump passes through the liquid injection pipe quilt It is injected into the sacculus.

In one embodiment, the amount of the heat-conducting medium injected in the sacculus limits the shape of the sacculus.

Compared with the existing technology, as follows with progress the advantages of the utility model：

1, the cryoablation conduit of the utility model passes through directional curvature by the way that directional curvature part is arranged on circulation loop The design positioned in the middle part of part unilateral side joint-cutting or spring ring makes the bending direction of directional curvature part controllable, is adjusted by topping-up pump Pressure in sacculus changes the shape of sacculus so that the bending angle of directional curvature part with sacculus shape respective change, The angle of pressure more macrobending is bigger, and directional curvature part is closer apart from sacculus inner wall, and then circulation loop is driven to synchronize bending, makes The spacing for obtaining circulation loop and sacculus inner wall is adjustable, and the smaller freezing performance of spacing of circulation loop and sacculus inner wall is got over It is good, therefore the rate of temperature fall and cryogenic temperature in cryoablation region can be effectively controlled, improve the freezing performance of conduit.

2, the cryoablation conduit of the utility model adjusts curved bolster by the setting at directional curvature part both ends, can be to avoid Directional curvature part operation risk caused by with being damaged in knee when ball intraluminal pressure macrobending amplitude increases, improves safety Property.

3, the cryoablation conduit of the utility model is by being arranged multigroup circulation loop, can be with by multigroup cross arrangement Effectively improve the freezing performance of conduit so that cold disperses evenly；The distal end switching multi-channel pipe of circulation loop, each access It staggeredly communicates so that freezing performance is more balanced；Cooling capacity exchanging element is arranged in the distal end of circulation loop, and cold aggregation can be more preferable Control cold dispersion, optimization freezing performance.

Description of the drawings

Fig. 1 is the structural schematic diagram of the cryoablation conduit of the utility model；

Fig. 2 a are the structural schematic diagrams of the first freezing unit of the cryoablation conduit of the utility model；

Fig. 2 b-2d are the using process diagrams of the freezing unit of Fig. 2 a；

Fig. 3 is the structural schematic diagram of second of freezing unit of the cryoablation conduit of the utility model；

Fig. 4 a are diagrammatic cross-section of the supply unit along A-A of the cryoablation conduit shown in FIG. 1 of the utility model；

Fig. 4 b and Fig. 4 c are the freezing unit of the cryoablation conduit of the utility model and its diagrammatic cross-section along B-B；

Fig. 5 a are the structural schematic diagrams of the distal end of the first circulation loop of the cryoablation conduit of the utility model；

Fig. 5 b are the structural schematic diagrams of the distal end of second of circulation loop of the cryoablation conduit of the utility model；

Fig. 5 c are the structural schematic diagrams of the distal end of the third circulation loop of the cryoablation conduit of the utility model；

Wherein, 110 be freezing unit, and 120 be supply unit, and 130 be operating unit, and 111 be sacculus, and 1121 be directing curves Bent part, 11211 be the stainless steel tube or NiTi pipe of unilateral joint-cutting, and 11212 be spring ring, and 1122 be to adjust curved bolster, and 11221 are First adjusts curved bolster, and 11222 be the curved bolster of the second tune, and 1123 be Cooling capacity exchanging element, and 1124 be multi-channel pipe, and 121 are Sheath, 122 be circulation loop, and 123 be wire leading pipe, and 124 be liquid injection pipe, and 1221 be input pipe, and 1222 be efferent duct, and 131 be control Handle processed, 132 be freezing handle, and 1311 be operation handle, and 1312 be wire leading pipe connecting seat, and 1313 be liquid injection pipe connecting seat, 1321 be connection flexible pipe, and 1322 be inlet suction port, and 1323 be vacuum adapter, and 1324 be return-air connector.

Specific implementation mode

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, develop simultaneously reality referring to the drawings Example is applied the utility model is described in detail.

Proximal end described in the utility model refers to one end close to operator, and the distal end refers to far from surgical procedure One end of person.

Shown in b as Figures 1 and 4, a kind of cryoablation conduit of the utility model includes freezing unit 110, supply unit 120, operating unit 130, the supply unit 120 include sheath 121 and axially disposed in the sheath 121 are recycled back to Road 122, the circulation loop 122 include input pipe 1221 and efferent duct 1222, and the freezing unit 110 is arranged on described 121 distal portions of sheath, the freezing unit 110 include sacculus 111 and directional curvature part 1121, the circulation loop 122 Distal portions are arranged in the sacculus 111, and the distal end of the distal end of the circulation loop 122 and the sacculus 111, which is fixed, to be connected It connects, the directional curvature part 1121 is socketed on the distal portions of the circulation loop 122, and the shape of the sacculus 111 becomes Change and the directional curvature part 1121 is driven to be bent so that the spacing-controllable of the circulation loop 122 and 111 inner wall of the sacculus.

Wherein input pipe 1221 flows back for conveying refrigerant, efferent duct 1222 for refrigerant, and input pipe 1221 conveys Refrigerant is flowed back by efferent duct 1222 again to sacculus 111, establishes a circulation path, and refrigerant passes through input pipe 1221 and output With the heat-conducting medium heat exchange in sacculus 111 to which cold is transmitted to therapentic part, refrigerant does not spray directly pipe 1222 In sacculus inner wall, the safety of cryoablation conduit is improved.

Shown in a as Figures 1 and 4, supply unit 120 includes wire leading pipe 123, liquid injection pipe 124, circulation loop 122 and sheath 121, wherein wire leading pipe 123, liquid injection pipe 124, circulation loop 122 is respectively set in sheath 121,121 distal end of sheath and ball 111 proximal end hot-melting sealed of capsule, 121 inner cavity of sheath generate vacuum by equipment, form vacuum heat-insulating layer；The distal end of wire leading pipe 123 With the distal end hot-melting sealed of sacculus 111,1312 dispensing of wire leading pipe connecting seat on the proximal control handle 131 of wire leading pipe 123 is close Envelope, wire leading pipe 123 is seal wire access, for assisting cryoablation conduit to establish channel in vivo；The distal end of liquid injection pipe 124 and ball The proximal end hot-melting sealed of capsule 111, and be in fluid communication with the sacculus 111, the proximal end of the liquid injection pipe 124 is connected to topping-up pump, Heat-conducting medium in the topping-up pump is injected by the liquid injection pipe 124 in the sacculus 111, keeps sacculus 111 full, note The amount for entering the heat-conducting medium in the sacculus 111 limits the shape of the sacculus 111, the proximal end of liquid injection pipe 124 and control 1313 dispensing of liquid injection pipe connecting seat sealing on handle 131.

Operating unit 130 includes freezing handle 132 and control handle 131, and freezing handle 132 includes connection flexible pipe 1321 With inlet suction port 1322, return-air connector 1324 and the vacuum adapter 1323 in freezing handle 132 proximal end are set, be recycled back to Road 122 is arranged in the connection flexible pipe 1321, and is connect with freezing equipment by inlet suction port 1322, for receiving refrigeration Agent.The distal end of connection flexible pipe 1321 is in fluid communication by controlling handle 131 and sheath 121, and with control handle 131 and freezing 132 dispensing of handle seals, so that the inner cavity of hose 1321 and sheath 121 is generated vacuum will pass through equipment, forms vacuum insulation Layer, for protecting circulation loop 122 to optimize the performance of cryoablation conduit.

Seal wire is arranged in wire leading pipe 123, and cryoablation conduit is moved to destination organization ablation areas along seal wire.Note Liquid pump is connected to the liquid injection pipe connecting seat 1313 on control handle 131, passes through 124 filling heat-conductive medium Filled Balloon of liquid injection pipe 111, topping-up pump, which is adjusted to suitable pressure, can make 111 dilatancy of sacculus, drive directional curvature part 1121 to be bent so that fixed It drives circulation loop 122 to be bonded 111 inner wall of sacculus to bool 1121,1121 distance of directional curvature part can be controlled by pressure regulation The spacing of 111 inner wall of sacculus, therefore the rate of temperature fall and cryogenic temperature of cryoablation conduit can be efficiently controlled；Starting device Freezing function, refrigerant are inputted by equipment storage device, the inlet suction port 1322 on chilled handle 132 and circulation loop 122 It is transported in sacculus 111, as shown in Figure 5 a, circulation loop 122 includes multigroup input pipe 1221 and efferent duct 1222, and every group defeated Enter pipe 1221 to connect with the distal end of efferent duct 1222, be arranged to a n shapes circuit, the distal end in multiple n shapes circuits is mutually handed over Mistake setting.Refrigerant is directly flowed back by efferent duct 1222 after reaching 1221 distal end of input pipe, is reached using supply unit 120 cold Freeze handle 132, refrigerant storage device is flowed by return-air connector 1324, thus generates freeze cycle.Due to having in sacculus 111 The distal portions of injection, circulation loop 122 generate cold under ultralow temperature by liquid conductive, and sacculus 111 is made to form ice hockey, Make its internal generation ice crystal and tearing phenomenon through tissue, to achieve the purpose that cryoablation.After being chilled to the predetermined time, Pass hull closure freezes button, opens rewarming function, and rewarming is the room temperature that equipment will enter cryoablation conduit by heating device Gas is heated to scheduled temperature, to make the gas into input pipe 1221 become hot gas, reaches the remote of circulation loop 122 It can accelerate the dissolving of ice hockey that sacculus 111 is made to be rapidly separated tissue after end part, avoid due to 111 long-time blocking blood flow of sacculus It causes to damage.After reaching the rewarming predetermined time, rewarming button is closed, pumpback topping-up pump makes sacculus 111 shrink, while freezing being disappeared Melt conduit and recall intrathecal, it is external to recalling so that freezing unit 110 becomes lineament by the constraint and resistance of sheath, completes whole A cryoablation process.

As shown in Figure 5 b, the circulation loop 122 includes multigroup input pipe 1221 and efferent duct 1222, circulation loop 122 Distal end multi-channel pipe 1124 is set, the multi-channel pipe 1124 is fixedly connected with the distal end of the sacculus 111, every group of input pipe 1221 weld with the input port welded seal of multi-channel pipe 1124, the delivery outlet of every group of efferent duct 1222 and multi-channel pipe 1124 Sealing, multigroup input pipe 1221 and the combined stabilized structure of efferent duct 1222, cold is uniformly dispersed when freezing, and performance is more steady It is fixed.As shown in Figure 5 c, the distal end setting Cooling capacity exchanging element 1123 of circulation loop 122, the distal end quilt of Cooling capacity exchanging element 1123 It blocks, the distal end of the Cooling capacity exchanging element 1123 is fixedly connected with the distal end of the sacculus 111, Cooling capacity exchanging element 1123 The proximal end distal end welded seal with the input pipe of the circulation loop 122 1221 and efferent duct 1222 respectively, refrigerant is through input After pipe 1221 reaches Cooling capacity exchanging element 1123, the injection release in Cooling capacity exchanging element 1123, then flowed by efferent duct 1222 Go out to refrigerant storage device, complete freeze cycle, this structure cold is more assembled, and performance is uniform, and effect is more preferable.

In one embodiment, as shown in figures 2 a and 2b, directional curvature part 1121 be unilateral joint-cutting stainless steel tube or NiTi pipe 11211, unilateral joint-cutting are arranged on the side towards 111 geometric center of the sacculus, built in directional curvature part 1121 Input pipe 1221 or efferent duct 1222, conduct in order to not influence cold, and material is preferably metal.Because of directional curvature part 1121 Both ends are separately fixed at sacculus 111 proximally and distally, during 111 dilatancy of sacculus, 1121 stress of directional curvature part Crimp, it is fixed since the joint-cutting direction of directional curvature part 1121 is directed towards the side of 111 geometric center of the sacculus It is that the direction expanded towards sacculus 111 is bent to bool 1121, when sacculus 111 because internal pressure becomes larger, when deformation increases, 1121 stress of directional curvature part also becomes larger therewith, and the bending angle of directional curvature part 1121 also becomes larger simultaneously；It is closed when pressure reaches Just when directional curvature part 1121 can be bonded 111 inner wall of sacculus.When sacculus 111 is shunk, with the reduction of pressure in sacculus 111 and The external constraint of sacculus 111, directional curvature part 1121 can opposite rebound, tend to lineament, when withdraw cryoablation conduit into It is intrathecal, in addition the restraining force of sheath can make freezing unit 110 become linear so that cryoablation conduit withdraws from external ratio smoothly. Directional curvature part 1121 can realize the big ditty adjusted curved function, and can deformed according to sacculus 111 according to 111 expansion or shrinkage of sacculus The bending angle of control directional curvature part 1121 is allowed to be bonded 111 inner wall of sacculus so that the freezing performance of cryoablation conduit is more It is good.It, can be by the deformation extent of regulation and control sacculus 111, to change if preventing from causing unnecessary damage because cold release is excessive The distance between directional curvature part 1121 and 111 inner wall of sacculus, to control the rate of temperature fall and freezing temperature in cryoablation region Degree.The stainless steel tube or 11211 plasticity of NiTi pipe of unilateral joint-cutting are preferable, are easy to control, fixed simple, can preferably meet simultaneously Directional curvature part 1121 is bent and rebound function, and cryoablation conduit is facilitated to withdraw into sheath.

It is provided in the distal end of directional curvature part 1121 and/or proximal end and adjusts curved bolster (1122).In an embodiment In, it is the first curved bolster 11221 of tune to be arranged in 1121 distal end of directional curvature part, is arranged in the directional curvature part 1121 proximal ends are second to adjust curved bolster 11222.First adjusts the proximal end of curved bolster 11221 and 1121 distal end of directional curvature part Fixed, first adjusts the distal end of curved bolster 11221 and the distal end of input pipe 1221 or efferent duct 1222 to fix；Second adjusts curved delay The distal end of stamping 11222 is fixed with 1121 proximal end of directional curvature part, and second adjusts the proximal end of curved bolster 11222 and input pipe 1221 Or efferent duct 1222 is fixed.It is spring or macromolecule hose that the first curved bolster 11221 and second of tune, which adjusts curved bolster 11222,. In one embodiment, first adjust curved bolster 11221 proximal end and directional curvature part 1121 distal end clearance fit, boundary At gap protection is fixed using UV glue or high molecular material；Second adjusts the distal end of curved bolster 11222 and directional curvature part 1121 proximal end clearance fit fixes protection at the gap of boundary using UV glue or high molecular material；When sacculus 111 expands, The meeting flexural deformation of directional curvature part 1121, if it is spring that the first curved bolster 11221 and second of tune, which adjusts curved bolster 11222, by In the elasticity and better softness of spring, and it is arranged in the knee of directional curvature part 1121, it can be in directional curvature part 1121 Strong buffering and protection are provided when bend by pressure and input pipe 1221 and efferent duct 1222 can be protected not to be lost；Sacculus 111 After contraction, first adjusts curved bolster 11221 and second to adjust curved bolster 11222 that directional curvature part 1121 can be followed to change, finally Initial linear construction is returned, is withdrawn from vitro convenient for cryoablation conduit.

In another embodiment, as shown in figure 3, with Fig. 2 a and 2b difference lies in：Directional curvature part 1121 is bullet Spring coil 11212, the middle section of the spring ring 11212 is fixed on towards 111 geometric center side of the sacculus to be recycled back to On the road, with fixed spring circle and bending direction is controlled, 11212 loose opposite side of spring ring makes directional curvature convenient for bending The direction that part 1121 is expanded towards sacculus 111 is bent and is intended to 111 inner wall of sacculus；The elasticity and flexibility of spring ring 11212 Preferably, bending and rebound function can be realized well, when sacculus 111 is shunk, with the reduction of pressure and ball in sacculus 111 The external constraint of capsule 111, freezing unit 110 tend to be linear, withdraw cryoablation conduit 100 into sheath to more smooth in vitro.

Finally it should be noted that the foregoing is merely the preferred embodiment of the utility model, it is not used to limit The utility model processed, all any modification, equivalent and improvement made within the spirit and principle of the present invention etc., It should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of cryoablation conduit, it is characterised in that：Including supply unit (120) and freezing unit (110), the conveying is single First (120) include sheath (121) and axially disposed circulation loop (122) in the sheath (121), the freezing unit (110) distal portions of the sheath (121) are arranged on, the freezing unit (110) includes sacculus (111) and directional curvature The distal portions of part (1121), the circulation loop (122) are arranged in the sacculus (111), the circulation loop (122) Distal end be fixedly connected with the distal end of the sacculus (111), the directional curvature part (1121) is socketed in the circulation loop (122) on distal portions, the change in shape of the sacculus (111) drives directional curvature part (1121) bending so that institute State the spacing-controllable of circulation loop (122) and the sacculus (111) inner wall.

2. cryoablation conduit according to claim 1, which is characterized in that the directional curvature part (1121) is that unilateral side is cut The stainless steel tube or NiTi pipe (11211) of seam, the unilateral side joint-cutting are arranged on one towards the sacculus (111) geometric center Side.

3. cryoablation conduit according to claim 1, which is characterized in that the directional curvature part (1121) is spring ring (11212), the middle section of the spring ring (11212) is fixed to described towards the sacculus (111) geometric center side On circulation loop (122).

4. cryoablation conduit according to claim 1, which is characterized in that in the distal end of the directional curvature part (1121) And/or proximal end is provided with and adjusts curved bolster (1122).

5. cryoablation conduit according to claim 4, which is characterized in that the curved bolster (1122) is spring or height Molecule hose.

6. cryoablation conduit according to claim 1, which is characterized in that the circulation loop (122) includes multigroup defeated Enter pipe (1221) and efferent duct (1222), input pipe (1221) described in every group is connected with the distal end of the efferent duct (1222), shape At a n shapes circuit, the interlaced setting in distal end in multiple n shapes circuits.

7. cryoablation conduit according to claim 1, which is characterized in that the circulation loop (122) includes input pipe (1221) and multi-channel pipe (1124), the multi-channel pipe is arranged in efferent duct (1222), the distal end of the circulation loop (122) (1124) it is fixedly connected with the distal end of the sacculus (111), the input pipe (1221) is defeated with the multi-channel pipe (1124) Inlet seal, the efferent duct (1222) and the delivery outlet of the multi-channel pipe (1124) seal.

8. cryoablation conduit according to claim 1, which is characterized in that the circulation loop (122) includes input pipe (1221) it is handed over efferent duct (1222), the distal end setting Cooling capacity exchanging element (1123) of the circulation loop (122), the cold The distal end for changing element (1123) is blocked, and the distal end of the Cooling capacity exchanging element (1123) is solid with the distal end of the sacculus (111) Fixed connection, the proximal end of the Cooling capacity exchanging element (1123) respectively with the input pipe (1221) and the efferent duct (1222) Distal seal.

9. cryoablation conduit according to claim 1, which is characterized in that the supply unit (120) further includes fluid injection It manages (124), the proximal end of the liquid injection pipe (124) is connected to topping-up pump, the distal end of the liquid injection pipe (124) and the sacculus (111) it is in fluid communication, the heat-conducting medium in the topping-up pump is injected into the sacculus (111) by the liquid injection pipe (124) It is interior.

10. cryoablation conduit according to claim 9, which is characterized in that injects in the sacculus (111) described leads The amount of thermal medium limits the shape of the sacculus (111).