CN219614011U - Cryoablation device - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, and discloses a cryoablation device, which comprises: a conduit having a first channel and a second channel formed therein; a balloon having a receiving cavity in communication with the first channel and the second channel; and the driving piece is communicated with the guide pipe and the freezing medium source. According to the utility model, after the balloon reaches a designated position along with the catheter, a freezing medium continuously enters the accommodating cavity through the first channel and flows out through the second channel, the initial state of the balloon is a contracted state, the balloon can be gradually propped up while the accommodating cavity is filled with the freezing medium, a propping-up assembly is not required to be arranged, the balloon can always keep a preset freezing temperature by the circularly flowing freezing medium, after the balloon is attached to the inner wall of a target position, the target position is quickly frozen and proliferated cells are killed, and the necrotic cells are discharged through metabolism, so that the inner wall thinning inner diameter of the target position is increased, and the problem that the existing balloon dilating catheter is difficult to effectively eliminate vascular stenosis is effectively solved.

Description

Cryoablation device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a cryoablation device.

Background

Vascular stenosis generally refers to the phenomenon in which the lumen of a blood vessel becomes small, resulting in a blockage of blood flow through a stenosed portion. There are many factors that cause vascular stenosis, one is vascular stenosis caused by congenital vascular abnormalities, the other is vascular stenosis caused by acquired diseases, including bad life, the inner wall of the blood vessel is gradually thickened, and finally, the vascular stenosis is formed.

At present, vascular stenosis is mainly treated by Percutaneous Transluminal Angioplasty (PTA), after percutaneous puncture of a blood vessel, a balloon dilation catheter is sent to a stenosis part, the stenosis part is dilated, the inner diameter of the balloon dilation catheter is corrected to be consistent with the inner diameter of a normal blood vessel, the method is small in wound, quick in treatment, less in vascular damage and capable of being repeatedly performed, but as a result, only the stenosis part can be corrected by using the balloon dilation catheter, the problem of vascular stenosis cannot be fundamentally solved, and a patient needs to dilate the stenosis part again every half year to ensure the correction effect, so that the existing balloon dilation catheter still has the problem that the vascular stenosis is difficult to effectively eliminate.

Disclosure of Invention

In view of the above, the present utility model provides a cryoablation device to solve the problem that the existing balloon dilation catheter is difficult to effectively eliminate vascular stenosis.

The present utility model provides a cryoablation device comprising: the guide pipe is internally provided with a first channel and a second channel, a medium inlet communicated with the first channel and the outer wall of the guide pipe is formed in the guide pipe, a medium outlet communicated with the second channel and the outer wall of the guide pipe is also formed in the guide pipe, and the first channel and the second channel are suitable for being communicated with a freezing medium source; the balloon is fixedly sleeved on the catheter, the inner wall of the balloon and the outer wall of the catheter encircle to form a containing cavity, the containing cavity is respectively communicated with the medium inlet and the medium outlet, the balloon is provided with an expansion state expanding outwards and a contraction state contracting inwards, a freezing medium source, a first channel, the containing cavity and a second channel form a first circulation loop, and the balloon is suitable for being switched from the contraction state to the expansion state under the action of the freezing medium so as to enable the balloon to be attached to the inner wall of the tissue to be cryoablated; and the driving part is communicated with the guide pipe and the freezing medium source and drives the freezing medium to circularly flow in the first circulation loop.

The balloon is arranged at one end of the catheter, the other end of the balloon is connected with a freezing medium source, when the balloon reaches a designated position along with the catheter, the freezing medium continuously enters the accommodating cavity through the first channel and flows out through the second channel, the initial state of the balloon is a contracted state, the balloon can be gradually supported by the freezing medium when the freezing medium is input and the accommodating cavity is filled, a supporting component is not required to be arranged, the balloon can always keep a preset freezing temperature by the circulating freezing medium, after the balloon is attached to the inner wall of the target position, the target position is quickly frozen and proliferated cells are killed, the necrotic cells are discharged through metabolism, the inner wall of the target position is thinned, the inner diameter of the balloon is increased, and the problem that the existing balloon dilating catheter is difficult to effectively eliminate vascular stenosis is effectively solved by using a simple and reliable device.

In an alternative embodiment, the first channel and the second channel are arranged side by side.

The freezing medium in the accommodating cavity flows out from the medium outlet to form a stable circulating passage, and the device has a simple structure and is convenient to process.

In an alternative embodiment, the cryoablation device further comprises a host in which the drive member and the source of the freezing medium are disposed, the host having a frozen state in which the freezing medium flows in the first circulation loop.

The working state of the driving piece is controlled by the controller in the host, so that the input and output of the freezing medium are controlled, and the control process is more intelligent and rapid.

In an optional embodiment, the host is further provided with a normal temperature medium source, the first channel, the accommodating cavity and the second channel form a second circulation loop, the host is further provided with a temperature return state for enabling the normal temperature medium to flow in the second circulation loop, the host is suitable for being switched into the temperature return state after the freezing state is finished, the risk of frostbite or embolism and the like caused by long-time low temperature of the target position is avoided, and the cryoablation process is safer and more reliable.

In an alternative embodiment, the freezing medium and the normal temperature medium are the same medium at different temperatures, and both the freezing medium and the normal temperature medium are in a gaseous or liquid state.

If the freezing medium and the normal temperature medium are different, when the temperature of the freezing medium is increased from a liquid state to a gas state, the volume of the freezing medium is rapidly expanded, and the balloon or the catheter is easily broken, so that the medium in the same state needs to be selected.

In an alternative embodiment, the catheter is further provided with a third channel inside, the third channel extending in a direction consistent with the direction of extension of the catheter and extending through both ends of the catheter, the third channel being adapted for the delivery of one or more of a guidewire, a drug and a developer.

In an alternative embodiment, the interior of the catheter is further provided with a fourth channel, the direction of extension of which corresponds to the direction of extension of the catheter, the fourth channel being adapted to be penetrated by the detection member.

The detection component can detect various state information at the balloon and also can detect state information near the target position, and the cryoablation process is monitored in real time, so that the cryoablation is accurately carried out.

In an alternative embodiment, the end of the catheter far away from the balloon is fixedly provided with a connecting part, and the catheter is connected with the host computer through the connecting part, so that the structure is simple and reliable.

In an alternative embodiment, the connecting portion includes connector, first connecting pipe and second connecting pipe, and the one end fixed connection that the sacculus was kept away from to connector and pipe, and first connecting pipe passes through connector and first passageway intercommunication, and the second connecting pipe passes through connector and second passageway intercommunication, and the one end that the connector was kept away from to first connecting pipe and second connecting pipe communicates with the freezing medium source respectively, prevents that first passageway and second passageway interval distance from being less and interfering each other.

In an alternative embodiment, the interior of the catheter is further provided with a third channel, the connection part further comprises a third connection pipe, the third connection pipe is communicated with the third channel through the connection head, and one or more of the guide wire, the medicine and the developer are suitable for entering the third channel through the third connection pipe; and/or, the inside of the conduit is also provided with a fourth channel for the detection part to penetrate through, the connecting part also comprises a fourth connecting pipe, the fourth connecting pipe is communicated with the fourth channel through a connector, and the detection part is suitable for penetrating into the fourth channel through the fourth connecting pipe.

The third connecting pipe and the fourth connecting pipe are independent pipelines, and the guide wire and the detection part can stably penetrate into the corresponding channel, so that interference conditions in the using process are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a three-dimensional schematic view of a cryoablation apparatus in accordance with a first embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the cryoablation device of FIG. 1 in one direction of a balloon;

FIG. 3 is another directional cross-sectional view of the balloon of the cryoablation device shown in FIG. 1;

FIG. 4 is a schematic cross-sectional view of a catheter of the cryoablation device shown in FIG. 1;

fig. 5 is a schematic cross-sectional view of a catheter of a cryoablation device in accordance with a second embodiment of the present utility model.

Reference numerals illustrate:

1. a conduit; 101. a first channel; 1011. a media inlet; 102. a second channel; 1021. a medium outlet; 103. a third channel; 104. a fourth channel; 2. a balloon; 201. a receiving chamber; 301. a connector; 302. a first connection pipe; 303. a second connection pipe; 304. a third connection pipe; 305. a fourth connection pipe; 306. an outer joint.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiments of the present utility model are described below with reference to fig. 1 to 5.

According to a first aspect of the embodiments of the present utility model, there is provided a cryoablation device comprising a catheter 1, a balloon 2 and a driver.

The inside of the conduit 1 forms a first channel 101 and a second channel 102, a medium inlet 1011 which is communicated with the first channel 101 and the outer wall of the conduit 1 is arranged on the conduit 1, a medium outlet 1021 which is communicated with the second channel 102 and the outer wall of the conduit 1 is also arranged on the conduit 1, and the first channel 101 and the second channel 102 are suitable for being communicated with a freezing medium source;

the balloon 2 is fixedly sleeved on the catheter 1, the inner wall of the balloon 2 and the outer wall of the catheter 1 are surrounded to form a containing cavity 201, the containing cavity 201 is respectively communicated with a medium inlet 1011 and a medium outlet 1021, the balloon 2 is provided with an outward-expansion state and an inward-contraction state, a freezing medium source, the first channel 101, the containing cavity 201 and the second channel 102 form a first circulation loop, and the balloon 2 is suitable for being switched from the contraction state to the expansion state under the action of the freezing medium so as to enable the balloon 2 to be attached to the inner wall of a tissue to be cryoablated;

the driving member is communicated with the guide pipe 1 and the freezing medium source, and drives the freezing medium to circularly flow in the first circulation loop.

By applying the cryoablation device of the embodiment, the balloon 2 is arranged at one end of the catheter 1, the other end of the balloon 2 is connected with a freezing medium source, after the balloon 2 reaches a designated position along with the catheter 1, the freezing medium continuously enters the accommodating cavity through the first channel 101 and flows out through the second channel 102, the initial state of the balloon 2 is a contracted state, the balloon 2 can be gradually propped up while the accommodating cavity is filled with the freezing medium due to certain pressure during the input of the freezing medium, a propping-up assembly is not needed, the balloon 2 can always keep a preset freezing temperature through the circulating freezing medium, after the balloon 2 is attached to the inner wall of a target position, the target position is quickly frozen and proliferated cells are killed, and the necrotized cells are discharged through metabolism, so that the inner wall thickness of the target position is increased, and the problem that the existing balloon dilation catheter is difficult to effectively eliminate vascular stenosis is effectively solved by using a simple and reliable device.

The cryoablation device of the embodiment can fundamentally solve the problem of vascular stenosis, avoid the problems of easy recurrence of PTA, easy vascular injury and rupture, and the like, and greatly improve the life quality of patients.

Specifically, in the related art, in order to keep the balloon 2 in the expanded state, an independent expanding device is required to be additionally arranged in the balloon 2, and the balloon 2 is expanded by using a mechanical structure or an independent expanding layer, because the inner diameters of blood vessels applying the balloon 2 and the catheter 1 are smaller, the balloon 2 is expanded by a mode in the related art while the catheter 1 and the balloon 2 have a cryoablation function, the structural complexity of the whole device is greatly improved, faults are easy to occur during use, and the device is difficult to process and manufacture, so the cryoablation device in the embodiment directly expands the balloon 2 by using a freezing medium with a certain pressure, and the device does not need to be provided with an independent expanding device while having the cryoablation function, thereby simplifying the structure and ensuring more reliable cryoablation process.

Further, if the pressure of the freezing medium cannot effectively expand the balloon 2, gas or liquid capable of expanding the balloon 2 may be introduced into the accommodating cavity 201, and after the balloon 2 is expanded, the freezing medium is used for cryoablation through the first circulation loop;

if considering that the balloon 2 can retract when the internal pressure becomes smaller and cannot be attached to the target position, the balloon 2 with the diameter slightly larger than the diameter required to be used at the target position can be used, and because the retraction amount of the balloon 2 is limited after the balloon 2 is fully expanded, a certain amount of retraction occurs when the balloon 2 is fully expanded and is filled with a freezing medium, at the moment, the diameter of the balloon 2 can just be matched with the diameter required to be used at the target position, the retracted balloon 2 still can be completely attached to the target position, and therefore the retraction problem after the balloon 2 is expanded is not worried. It should be noted that, the size of the balloon 2 to be marked is usually the size in practical application, and this size has already considered the problem of retraction in practical application, so the balloon 2 with the corresponding marked size may be used in the freezing operation, and the freezing medium can normally prop the balloon 2 open and make the balloon 2 completely fit with the target position, which is just one practical solution to the problem of retraction that may occur.

In this embodiment, the first channel 101 and the second channel 102 are arranged in parallel, and the two channels do not affect each other, so that the processing and manufacturing are convenient.

Specifically, the flow direction of the freezing medium in the first channel 101 and the second channel 102 is not limited, and the freezing medium may flow into the accommodating cavity 201 from the second channel 102 and flow out from the first channel 101; the specific opening positions of the medium inlet 1011 and the medium outlet 1021 are not limited, and may be circumferentially spaced on the outer wall of the catheter 1, or may be axially and circumferentially spaced at a certain interval.

Further, balloon 2 can withstand temperatures below-60 ℃; the outer diameter and the length of the balloon 2 are not limited, and can be selected according to the requirements of different focuses; the balloon 2 is preferably blow molded after being preheated by an extruded tube; the balloon 2 and the catheter 1 are formed by laser welding, so that the laser welding precision is higher, and the welding seam is not obvious. It will be appreciated that as an alternative embodiment, the balloon 2 may also be attached to the catheter 1 by means of an adhesive connection, hot melt welding, ultrasonic welding, etc.

Preferably, if the duct 1 is in a state of being low on the left and right during freezing, the medium inlet 1011 is provided at the right end of the accommodating chamber 201, the medium outlet 1021 is provided at the left end of the accommodating chamber 201, and if the duct 1 is in a state of being low on the left and right during freezing, the medium inlet 1011 is provided at the left end of the accommodating chamber 201, the medium outlet 1021 is provided at the right end of the accommodating chamber 201, so that the medium outlet 1021 is provided at the higher end, and the freezing medium can be in more sufficient contact with the inner wall of the accommodating chamber 201 after entering the accommodating chamber 201, thereby ensuring the freezing effect.

If the duct 1 is in a horizontal state during freezing, the positions of the medium inlet 1011 and the medium outlet 1021 may be selected according to the degree of convenience of processing.

Wherein, the direction toward the left indicated by the arrow in fig. 2 is toward the right indicated by the arrow in fig. 2.

In this embodiment, the cryoablation device further includes a host, in which the driving member and the source of the freezing medium are disposed, the host has a freezing state in which the freezing medium flows in the first circulation loop, and the working state of the driving member is controlled by a controller in the host, so as to control the input and output of the freezing medium, so that the control process is more intelligent and rapid.

Specifically, the specific structure of the host is not limited, reference can be made to the existing host capable of conveying the freezing medium, the specification of which can be selected according to the actual use requirement, and the specific structure and working principle of the host are not described here.

In this embodiment, the host is further provided with a normal temperature medium source, the first channel 101, the accommodating cavity 201 and the second channel 102 form a second circulation loop, the host is further provided with a temperature return state for flowing the normal temperature medium in the second circulation loop, the host is suitable for being switched to the temperature return state after the freezing state is finished, and risks such as frostbite or embolism caused by long-time low temperature of the target position are avoided, so that the cryoablation process is safer and more reliable.

In this embodiment, the freezing medium and the normal temperature medium are the same medium with different temperatures, and the freezing medium and the normal temperature medium are both in a gas state or a liquid state, and since the temperatures of the freezing medium and the normal temperature medium differ greatly, when the normal temperature medium is introduced into the accommodating chamber 201 in the frozen state, the normal temperature medium remains in contact with the freezing medium, and if the freezing medium and the normal temperature medium are different media, the volume of the freezing medium will expand rapidly when the temperature of the freezing medium increases from the liquid state to the gas state, which easily causes the balloon 2 or the catheter 1 to rupture, and therefore the medium in the same state needs to be selected.

Specifically, in order to prevent the mixed medium from being unusable due to the different types of the freezing medium and the normal temperature medium, the same type of medium is selected here.

Preferably, the freezing medium and the normal temperature medium are absolute ethyl alcohol, the temperature of the freezing medium is absolute ethyl alcohol lower than 50 ℃ below zero, the normal temperature medium is absolute ethyl alcohol in a room temperature state, and the freezing point of the absolute ethyl alcohol is 117.3 ℃ below zero, the boiling point of the absolute ethyl alcohol is 78.3 ℃ above zero, and the absolute ethyl alcohol is stable liquid in the normal temperature state and the low temperature state, so that the absolute ethyl alcohol is safer and more reliable in use, the risk of the traditional low temperature freezing medium such as liquid nitrogen is greatly reduced, and the absolute ethyl alcohol is more friendly to patients.

In this embodiment, the catheter 1 is further provided with a third channel 103 inside, the third channel 103 extending in the same direction as the catheter 1 and penetrating both ends of the catheter 1, the third channel 103 being adapted for delivering one or more of a guide wire, a drug and a developer.

Specifically, a guide wire is inserted into the third channel 103, the catheter 1 is guided by the guide wire to reach a target position, the medicine is conveyed through the third channel 103 to reach a formulated position, and the developer is conveyed through the third channel 103 to perform contrast examination on the target position, so that the third channel 103 has multiple functions.

In this embodiment, the catheter 1 is further provided with a fourth channel 104, the extending direction of the fourth channel 104 is consistent with the extending direction of the catheter 1, a detecting component is suitable for penetrating through the fourth channel 104, and the detecting component can detect various status information at the balloon 2 and status information near the target position, and can monitor the cryoablation process in real time, so as to precisely perform cryoablation.

Specifically, the type of the detecting member is not limited, and may be a temperature measuring device, a developing device, or the like, and may be selected as required.

Preferably, the detecting component is a temperature measuring device, a temperature measuring probe of the temperature measuring device is inserted into the fourth channel 104, and when the probe penetrates into the balloon 2, the temperature at the balloon 2 can be monitored in real time, so that the accurate control of the cryoablation technology is realized, and accidents caused by temperature runaway or errors are prevented.

In this embodiment, the end of the catheter 1 far away from the balloon 2 is fixedly provided with a connecting portion, and the catheter 1 is connected with a host through the connecting portion, so that the structure is simple and reliable.

In this embodiment, the connection portion includes a connector 301, a first connection pipe 302 and a second connection pipe 303, where the connector 301 is fixedly connected with one end of the catheter 1 away from the balloon 2, the first connection pipe 302 is communicated with the first channel 101 through the connector 301, the second connection pipe 303 is communicated with the second channel 102 through the connector 301, one ends of the first connection pipe 302 and the second connection pipe 303 away from the connector 301 are respectively communicated with a freezing medium source, and the first connection pipe 302 and the second connection pipe 303 are independent pipelines, so that the first channel 101 and the second channel 102 can be more conveniently communicated with the freezing medium source, and the first channel 101 and the second channel 102 are prevented from interfering with each other due to smaller separation distance.

In this embodiment, the catheter 1 is further provided with a third channel 103 inside, the connection part further comprises a third connection pipe 304, the third connection pipe 304 is communicated with the third channel 103 through the connection head 301, and one or more of a guide wire, a medicine and a developer are suitable for entering the third channel 103 through the third connection pipe 304; the inside of pipe 1 still is equipped with the fourth passageway 104 that supplies detection component to wear to establish, and connecting portion still includes fourth connecting pipe 305, and fourth connecting pipe 305 passes through connector 301 and fourth passageway 104 intercommunication, and detection component is suitable for penetrating in the fourth passageway 104 through fourth connecting pipe 305, and third connecting pipe 304 and fourth connecting pipe 305 are independent pipeline, and seal wire and detection component can more stably penetrate in the passageway that corresponds, reduce the interference condition in the use.

Specifically, the end of each connection tube remote from the connection head 301 is further provided with an external joint 306 for connection of the respective connection tube to the corresponding apparatus or device.

Preferably, the connector 301 is formed by insert injection molding, and the specific specification and size of the connector can be selected according to requirements; each connecting pipe is formed by extrusion; the outer joint 306 is formed by insert injection molding, and the connecting pipes of the outer joint 306 adopting the process are more firmly connected, and meanwhile, the bonding process can be omitted, so that the use of glue is avoided.

Further, the inner diameters and shapes of the first channel 101, the second channel 102, the third channel 103 and the fourth channel 104 are not limited, and each channel may have the same inner diameter with the same shape, may have different shapes and different direct shapes, and may be selected according to actual requirements, which is not strictly limited here.

According to a second embodiment of the present utility model, there is also provided a cryoablation device, which differs from the first embodiment in whether the fourth passage 104 and the fourth connection tube 305 are provided. The cryoablation device of the present embodiment is not provided with the fourth channel 104 and the fourth connecting tube 305.

The following describes a procedure of using the cryoablation device according to the first embodiment:

delivering the balloon 2 to the tissue to be cryoablated; the driving piece conveys the freezing medium to the accommodating cavity of the balloon 2 through the first channel 101 or the second channel 102 of the catheter 1, the balloon 2 is switched from a contracted state to an expanded state under the action of the freezing medium and is attached to the tissue to be cryoablated, and the pressure of the balloon 2 after expansion can reach more than 10 atm; the driving piece drives the freezing medium to circularly flow in a first circulation loop formed by the freezing medium source, the first channel 101, the accommodating cavity 201 and the second channel 102, the surface temperature of the balloon 2 is reduced to below 50 ℃ below zero within 30 seconds, and the freezing medium carries out cryoablation on the tissue to be cryoablated. Stopping delivering the freezing medium into the accommodating cavity of the balloon 2 after the cryoablation process is finished; a medium at normal temperature is fed into the accommodating chamber of the balloon 2 to warm the balloon 2. The driving piece drives the normal-temperature medium to circularly flow in a second circulation loop formed by the normal-temperature medium source, the first channel 101, the accommodating cavity 201 and the second channel 102; simultaneously with the steps, a detection component is arranged in the fourth channel 104 of the catheter 1 in a penetrating way so as to monitor the state of the balloon 2; after the proliferation cells killed by rapid freezing are discharged by metabolism, the inner diameter of the blood vessel is increased by thinning the wall of the blood vessel.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (10)

1. A cryoablation apparatus comprising:

a conduit (1) with a first channel (101) and a second channel (102) formed therein, wherein a medium inlet (1011) for communicating the first channel (101) with the outer wall of the conduit (1) is formed in the conduit (1), a medium outlet (1021) for communicating the second channel (102) with the outer wall of the conduit (1) is formed in the conduit (1), and the first channel (101) and the second channel (102) are suitable for communicating with a freezing medium source;

the balloon (2) is fixedly sleeved on the catheter (1), an accommodating cavity (201) is formed by encircling the inner wall of the balloon (2) and the outer wall of the catheter (1), the accommodating cavity (201) is respectively communicated with the medium inlet (1011) and the medium outlet (1021), the balloon (2) has an expansion state expanding outwards and a contraction state contracting inwards, the freezing medium source, the first channel (101), the accommodating cavity (201) and the second channel (102) form a first circulation loop, and the balloon (2) is suitable for being switched from the contraction state to the expansion state under the action of the freezing medium so as to enable the balloon (2) to be attached to the inner wall of tissue to be cryoablated;

and the driving piece is communicated with the guide pipe (1) and the freezing medium source and drives the freezing medium to circularly flow in the first circulation loop.

2. The cryoablation device of claim 1 wherein the first channel (101) and the second channel (102) are juxtaposed.

3. The cryoablation device of claim 1 further comprising a host in which the drive and the source of cryogenic medium are disposed, the host having a frozen state in which the cryogenic medium flows in the first circulation loop.

4. A cryoablation apparatus as in claim 3 wherein a source of ambient medium is further provided in the host, the source of ambient medium, the first channel (101), the receiving cavity (201) and the second channel (102) forming a second circulation loop, the host further having a tempering state for flowing the ambient medium in the second circulation loop, the host being adapted to switch to the tempering state after the end of the freezing state.

5. The cryoablation device of claim 4 wherein the freezing medium and the normothermic medium are the same medium at different temperatures, both being gaseous or liquid.

6. The cryoablation device according to any of claims 1 to 5, wherein the interior of the catheter (1) is further provided with a third channel (103), the third channel (103) extending in a direction consistent with the direction of extension of the catheter (1) and extending through both ends of the catheter (1), the third channel (103) being adapted for delivering one or more of a guidewire, a drug and a developer.

7. The cryoablation device according to any one of claims 1 to 5, wherein a fourth channel (104) is further provided inside the catheter (1), the direction of extension of the fourth channel (104) being consistent with the direction of extension of the catheter (1), the fourth channel (104) being adapted for penetration of a detection member.

8. The cryoablation device according to any one of claims 1 to 5, wherein an end of the catheter (1) remote from the balloon (2) is fixedly provided with a connection portion through which the catheter (1) is connected to a host computer.

9. The cryoablation device of claim 8 wherein the connection comprises a connector (301), a first connection tube (302) and a second connection tube (303), the connector (301) being fixedly connected to an end of the catheter (1) remote from the balloon (2), the first connection tube (302) being in communication with the first channel (101) via the connector (301), the second connection tube (303) being in communication with the second channel (102) via the connector (301), the ends of the first connection tube (302) and the second connection tube (303) remote from the connector (301) being in communication with the source of the cryogen medium, respectively.

10. The cryoablation apparatus of claim 9 wherein the device comprises a plurality of electrodes,

a third channel (103) is further arranged in the catheter (1), the connecting part further comprises a third connecting pipe (304), the third connecting pipe (304) is communicated with the third channel (103) through the connector (301), and one or more of a guide wire, a medicine and a developer are suitable for entering the third channel (103) through the third connecting pipe (304);

and/or the number of the groups of groups,

the inside of pipe (1) still is equipped with the fourth passageway (104) that supplies detection component to wear to establish, connecting portion still includes fourth connecting pipe (305), fourth connecting pipe (305) pass through connector (301) with fourth passageway (104) intercommunication, detection component is suitable for through fourth connecting pipe (305) are worn in fourth passageway (104).