CN111759450B - Cryoablation needle with adjustable return air path - Google Patents
Cryoablation needle with adjustable return air path Download PDFInfo
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- CN111759450B CN111759450B CN202010767640.0A CN202010767640A CN111759450B CN 111759450 B CN111759450 B CN 111759450B CN 202010767640 A CN202010767640 A CN 202010767640A CN 111759450 B CN111759450 B CN 111759450B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
- A61B2018/0212—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques using an instrument inserted into a body lumen, e.g. catheter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
- A61B2018/0231—Characteristics of handpieces or probes
- A61B2018/0237—Characteristics of handpieces or probes with a thermoelectric element in the probe for cooling purposes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
- A61B2018/0293—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques using an instrument interstitially inserted into the body, e.g. needle
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Abstract
The invention provides a cryoablation needle with an adjustable return air path, which comprises a needle tube, a J-T groove, a finned tube, an air inlet tube, a mandrel, a first return air channel cavity, a second return air channel cavity and a valve assembly, wherein the needle tube is arranged on the needle tube; the valve assembly includes a first valve structure; the mandrel stretches into the needle tube, an annular cavity is formed between the mandrel and the vacuum wall, the finned tube is wound on the outer side of the mandrel and is positioned in the annular cavity, and the outer ring of the finned tube is tightly attached to the vacuum wall; the air inlet of the first air return channel cavity is directly or indirectly connected to the first end of the annular cavity; the air inlet of the second air return channel cavity is directly or indirectly connected to the second end of the annular cavity; the first valve structure is used for: when the air return temperature is higher than the threshold temperature, the first air return channel cavity is controlled to circulate air return, so that part or all of the air return can be discharged through the first air return channel cavity; and when the return air temperature is lower than the threshold temperature, controlling the first return air channel cavity not to circulate return air so as to enable the return air to be discharged through the second return air channel cavity.
Description
Technical Field
The invention relates to the technical field of medical machinery, in particular to a cryoablation needle with an adjustable return air path.
Background
Cryoablation is a therapeutic means for damaging cells with extremely low temperatures, and in order to cause more serious irreversible damage to cells by undergoing a large temperature difference change in a shorter time, the cooling rate of the cryoablation apparatus needs to be further improved in order to maximize the effect of low-temperature damage.
In the prior art, in order to avoid the waste of cold energy in the use process of the cryoablation needle, a finned tube is often arranged on an air return path, so that the air return is subjected to heat exchange through fins or winding gaps of the finned tube, and the surplus cold energy in the air return is utilized.
However, in practical implementation processes, for example, in a period of time when the cryoablation needle is initially opened and in a needle test process in which the cryoablation needle is subjected to a method of freezing before re-warming, the temperature of the return air is often higher than the temperature of the inlet air, and in this case, the heat exchange at the fin tube cannot achieve the effect of recovering the cold energy, but also causes the temperature of the inlet air to rise, thereby affecting the cooling effect (for example, generating a negative effect on accelerating the cooling rate).
Disclosure of Invention
The invention provides a cryoablation needle with an adjustable return air path, which solves the problem that the cooling effect is affected when the return air temperature is higher than the air inlet temperature in the prior art.
According to the invention, there is provided a cryoablation needle with an adjustable return air path, comprising a needle tube, a J-T groove, a finned tube, an air inlet tube, a mandrel, a first return air channel cavity, a second return air channel cavity and a valve assembly; the valve assembly includes a first valve structure; the J-T groove, the finned tube and the air inlet pipe are sequentially and fixedly connected to form an air inlet channel;
the partial inner wall of the needle tube is a vacuum wall; the core shaft stretches into the needle tube, an annular cavity is formed between the core shaft and the vacuum wall, the finned tube is wound on the outer side of the core shaft and is positioned in the annular cavity, and the outer ring of the finned tube is tightly attached to the vacuum wall;
the air inlet of the first air return channel cavity is directly or indirectly connected to the first end of the annular cavity; the first end of the annular cavity is one end of the annular cavity close to the J-T groove;
the air inlet of the second air return channel cavity is directly or indirectly connected to the second end of the annular cavity; the second end of the annular cavity is the end of the annular cavity away from the J-T groove;
The first valve structure is arranged at least one of the following parts of the first air return channel cavity: the air inlet end, the air outlet end, in the first air return channel cavity, be used for:
When the return air temperature is higher than the threshold temperature, controlling the first return air channel cavity to circulate return air so that part or all of the return air can be discharged through the first return air channel cavity; when the return air temperature is lower than a threshold temperature, controlling the first return air channel cavity not to circulate return air, so that the return air is discharged through the second return air channel cavity; wherein the return air temperature is indicative of a gas temperature at a first end of the annular cavity; the threshold temperature is matched with the air inlet temperature of the air inlet end of the fin tube.
Optionally, the first air return channel cavity is formed in a first air return pipe;
the first air return pipe is an air return pipe arranged outside the needle tube, or: the mandrel is multiplexed as the first muffler.
Optionally, the first valve structure comprises a phase change spring, a first valve core, a first valve shell and a first sealing ring;
The first valve core can slide along the inner wall of the first valve shell, and a first valve sealing surface is arranged in the first end of the first valve shell; the first sealing ring is arranged on the first valve core, and the first valve core is also provided with a first valve core air return hole; the first end or the second end of the first valve shell is connected with one end of the first muffler; the first end of the first valve core air return hole is communicated to the first side of the first valve core along the air return flowing direction, the second end of the first valve core air return hole is communicated with a first interval between the outer wall of the first valve core and the inner wall of the first valve shell, and the first sealing ring is positioned between the first interval and the first valve sealing surface;
when the first valve core is positioned at a first valve core plugging position, the first valve sealing surface is in sealing contact with the first sealing ring to isolate the first interval from the second side of the first valve core along the return air flowing direction, so that the return air cannot be discharged through the first return air pipe;
when the first valve core is positioned at a first valve core non-blocking position, the first valve sealing surface is in unsealed contact with the first sealing ring, and the first interval is communicated with the second side of the first valve core along the return air flowing direction so that return air can be discharged through the first return air pipe;
one end of the phase change spring is directly or indirectly connected with the first valve core, so that the first valve core is driven to switch between the first valve core blocking position and the first valve core non-blocking position through telescopic deformation of the phase change spring.
Optionally, when the return air temperature is higher than the threshold temperature, the phase-change spring is in an austenite form; and when the return air temperature is lower than the threshold temperature, the phase change spring is in a martensitic form.
Optionally, the phase change spring is installed in the first valve housing, and the other end of the phase change spring is directly or indirectly connected with the second end of the first valve housing;
the first end of first valve casing is connected the one end of first muffler, the second end of first valve casing is equipped with first casing return vent, first casing return vent intercommunication is to the first end of annular chamber.
Optionally, the first valve structure further includes a phase-change spring housing, the phase-change spring is installed in the phase-change spring housing, one end of the phase-change spring is fixedly connected with the first end of the phase-change spring housing, and the other end of the phase-change spring is connected with the first valve core through a pull rod;
the second end of the first valve shell is connected with one end of the first air return pipe, the second end of the phase-change spring shell is connected with the other end of the first air return pipe, and the pull rod penetrates through the first air return pipe; the first end of the phase change spring shell is provided with a phase change spring shell air return hole, and the phase change spring shell air return hole is communicated to the first end of the annular cavity.
Optionally, the first valve structure further includes a compression spring, one end of the compression spring is connected with the first valve core, a position of the other end of the compression spring is fixed relative to the first valve housing, and the compression spring can generate a force that makes the first valve core approach to the first valve core blocking position.
Optionally, the second air return channel cavity is formed in a second air return pipe; the valve assembly further comprises a second valve structure, wherein the second valve structure comprises a second valve core, a second valve shell and a second sealing ring;
The second valve core can slide along the inner wall of the second valve shell, the inner wall of the second valve shell close to the first end is provided with a second valve sealing surface, the second end of the second valve shell is provided with a second shell air return hole, and the second shell air return hole is directly or indirectly communicated with the second air return channel cavity;
The second sealing ring is arranged on the second valve core, and a second valve core air return hole is further formed in the second valve core; the first end of the second valve core air return hole is communicated to the first side of the second valve core along the air return flowing direction, the second end of the second valve core air return hole is communicated to a second interval between the outer wall of the second valve core and the inner wall of the second valve shell, and the second sealing ring is positioned between the second interval and the second valve sealing surface;
the second valve core is connected with the first valve core through a push-pull rod so as to move along with the first valve core;
When the first valve core is positioned at the first valve core plugging position, the second valve sealing surface is in unsealed contact with the second sealing ring, and the second interval is communicated with the second side of the second valve core along the return air flowing direction so that return air can be discharged through the second return air pipe;
When the first valve core is positioned at the non-blocking position of the first valve core, the second valve sealing surface is in sealing contact with the second sealing ring so as to separate the second interval from the second side of the second valve core along the air return circulation direction, so that the air return cannot be discharged through the second air return pipe.
Optionally, the second valve structure further includes an extension spring, one end of the extension spring is installed on the second valve core, the other end of the extension spring is installed on the second valve housing, and the extension spring can generate an acting force that makes the second valve core approach to the second valve core plugging position.
Optionally, the first end of the second valve housing is directly or indirectly connected to the first end of the first valve housing, wherein: the second valve housing and the first valve housing are of an integral structure, or: the second valve housing is assembled with the first valve housing.
Optionally, the cryoablation needle with the adjustable return air path further comprises a total return air pipe, and the total return air pipe is connected to the air outlet of the first return air channel cavity and the air outlet of the second return air channel cavity.
Optionally, the cryoablation needle with the adjustable return air path further comprises a controller and a return air channel cavity temperature detection element; the valve assembly comprises a first electric control valve for controlling the on-off of the first return air channel cavity; the valve assembly further comprises a second electric control valve for controlling the on-off of the second return air channel cavity;
The return air channel cavity temperature detection element is used for detecting the return air temperature and feeding back the return air temperature to the controller;
the controller is electrically connected with the first electric control valve and the second electric control valve and is used for:
When the return air temperature is higher than the threshold temperature, the first electric control valve is controlled to be opened, so that all or part of return air can be discharged through the first return air channel cavity; and: and when the return air temperature is lower than the threshold temperature, controlling the first electric control valve to be closed and controlling the second electric control valve to be opened so that the return air can be discharged through the second return air channel cavity.
According to the cryoablation needle with the adjustable return air path, through switching of the return air path, when the return air temperature is higher than the air inlet temperature, the return air does not exchange heat with the air inlet or exchanges heat with the air inlet only by a small amount, so that the air inlet is prevented from being heated; when the temperature of the return air is lower than the temperature of the inlet air, the return air and the inlet air are subjected to heat exchange, so that the cooling rate of the inlet air is accelerated; thereby avoided the freeze ablation needle return air and the heat exchange that takes place with the air inlet and led to the air inlet temperature to rise, effectively ensured the cooling effect, be favorable to further improving the cooling rate of freeze ablation needle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a cryoablation needle with an adjustable return air path in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a cryoablation needle with an adjustable return air path in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a cryoablation needle with an adjustable return air path in accordance with one embodiment of the invention;
fig. 4 is a schematic diagram of a cryoablation needle with an adjustable return air path in accordance with an embodiment of the invention.
FIG. 5 is a schematic diagram of a first valve structure according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a cryoablation needle with an adjustable return air path in accordance with one embodiment of the invention;
FIG. 7 is a second schematic diagram of a first valve structure according to the present invention;
FIG. 8 is a schematic cross-sectional view of a valve assembly according to one embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a cryoablation needle with an adjustable return air path in accordance with an embodiment of the invention;
FIG. 10 is a schematic cross-sectional view of a valve assembly according to an embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view of a valve assembly according to an embodiment of the present invention;
FIG. 12 is a schematic cross-sectional view of a valve assembly according to an embodiment of the present invention.
Reference numerals illustrate:
1-a first muffler;
10-a first return air channel cavity;
2-a second muffler;
20-a second return air channel cavity;
3-valve assembly;
30-total air return pipe;
300-total air return holes;
301-a total return air channel cavity;
31-a first valve structure;
310-phase change spring;
311-a first valve core;
3110-a first valve core return vent;
3111-a first seal ring groove;
312-a first valve housing;
3120—a first sealing surface;
3121—a first housing back cover;
3122—a first housing return vent;
313-a first seal ring;
314—a phase change spring housing;
3140—a phase change spring housing rear cover;
3141-a phase change spring return air hole;
315-pull rod;
316-compression spring;
32-a second valve structure;
320-stretching a spring;
321-a second valve core;
3210-a second valve core air return hole;
3211-a second seal ring groove;
322-a second valve housing;
3220-a second sealing surface;
3221-a second housing rear cover;
3222-a second housing return vent;
323-second sealing ring;
33-a push-pull rod;
4-an air inlet pipe;
5-a mandrel;
6-fin tubes;
7-vacuum walls;
711-a front section outer tube;
712-rear end outer tube;
72-inner tube
8-J-T slots;
9-needle tube;
91-an extension tube;
92-handle.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the invention.
The terms first, second, third and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the examples of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Referring to fig. 1 to 4, the cryoablation needle with an adjustable return air path comprises a needle tube 9, a J-T slot 8, a finned tube 6, an air inlet tube 4, a mandrel 5, a first return air channel cavity 10, a second return air channel cavity 20 and a valve assembly 3; the valve assembly 3 comprises a first valve structure 31, and the J-T groove 8, the finned tube 6 and the air inlet tube 4 are sequentially and fixedly connected to form an air inlet channel;
Referring to fig. 3 or fig. 4, the air intake passes through the air intake channel from the tail of the needle tube 9 to finally reach the needle 93, and is output out of the needle tube 9 through the needle 93; return air can be understood as: the needle 93 does not successfully output the gas remained in the needle tube 9 outside the needle tube 9; the direction of the return air flow is opposite to the direction of the intake air flow.
A part of the inner wall of the needle tube 9 is a vacuum wall 7;
in an example, referring to fig. 3 and 4, the vacuum wall 7 is formed by vacuum-treating an inner tube 72 and an outer tube, and the outer tube includes a front outer tube 711 and a rear outer tube 712.
In one example, the needle cannula 9 further includes an extension tube 91 and a handle 92.
Referring to fig. 1 to 4, the mandrel 5 extends into the needle tube 9, the finned tube 6 is wound on the outer side of the mandrel 5, and the outer ring of the finned tube 6 is tightly attached to the vacuum wall 7; an annular cavity is formed between the mandrel 5 and the vacuum wall 7; the finned tube 6 is located in the annular cavity.
The air inlet of the first return air channel cavity 10 is directly or indirectly connected to the first end of the annular cavity; the first end of the annular cavity is the end of the annular cavity close to the J-T groove 8;
The air inlet of the second return air channel chamber 20 is connected to the second end of the annular chamber; the second end of the annular cavity is the end of the annular cavity away from the J-T groove 8;
In the annular cavity, a winding gap can be formed between the fin tube 6 and the mandrel 5 and between the fin tube 6 and the vacuum wall 7, wherein the return air can exchange heat with the air inlet in the fin tube 6 when passing through the annular cavity.
In one example, the second air return pipe 2 is located inside the cryoablation needle, the air return is discharged through the rear end of the cryoablation needle, in other examples, the second air return pipe 2 can also be located at the section of the cryoablation needle and the host, and the air return is discharged after passing through the cryoablation needle and the host.
The first valve structure 31 in the valve assembly 3 is disposed in at least one of the following parts of the first return air channel chamber 10: the air inlet end, the air outlet end, in the first air return channel cavity, be used for: when the return air temperature is higher than the threshold temperature, the first return air channel cavity 10 is controlled to circulate return air so that part or all of the return air can be discharged through the first return air channel cavity; when the return air temperature is lower than a threshold temperature, controlling the first return air channel cavity 10 not to circulate return air so that the return air is discharged through the second return air channel cavity 20;
The return air temperature is indicative of a gas temperature at a first end of the annular chamber;
the threshold temperature matches the intake air temperature of the intake end of the fin tube 6.
In one example, a temperature sensitive element may be used in the first valve structure 31 of the valve assembly 3, and the characteristic that the element may change according to different properties of temperature may be used to control the circulation or non-circulation of the first return air channel cavity 10, such as a thermistor, a memory alloy, and the like. The selection of the component performance parameter matches the threshold temperature.
In other examples, the return air temperature may be collected by a temperature detecting element disposed at the first end of the annular chamber, the threshold temperature may be collected by a temperature detecting element disposed at the air inlet end of the fin tube 6, for example, and the valve assembly 3 may be capable of controlling the circulation or non-circulation of the first return air channel chamber 10 in response to a comparison of the return air temperature collecting value and the threshold temperature collecting value, and in further aspects, may also control the circulation or non-circulation of the second return air channel chamber 20.
In an exemplary working process, when the return air temperature is greater than the threshold temperature, the valve assembly 3 controls the first return air channel cavity 10 to circulate, and part or all of return air flows out from the valve assembly 3 through the first return air channel cavity 10 sequentially through the vacuum wall 7; when the return air temperature is less than the threshold temperature, the valve assembly 3 controls the first return air channel cavity 10 not to circulate, and all return air flows out through the second return air channel cavity 20 through the vacuum wall 7 and the annular cavity in sequence.
The application fully considers the influence of the relative height of the return air temperature and the air inlet temperature on the cooling rate of the cryoablation needle, and particularly considers the negative effect on the cooling rate of the cryoablation needle when the return air temperature is higher than the air inlet temperature. The method comprises the following steps:
In the scheme, through switching of the air return path, when the air return temperature is higher than the air inlet temperature, the air return does not exchange heat with the air inlet or exchanges heat with the air inlet only slightly, so that the air inlet is prevented from being heated; when the temperature of the return air is lower than the temperature of the inlet air, the return air and the inlet air are subjected to heat exchange, so that the cooling rate of the inlet air is accelerated; therefore, the defect that the temperature of the air inlet is increased due to heat exchange between the air return and the air inlet under the condition that the temperature of the air return of the cryoablation needle is higher than the temperature of the air inlet in the actual implementation process is avoided, and negative effects are generated on the cooling rate, so that the possibility is provided for further improving the cooling rate of the cryoablation needle.
In one embodiment, referring to fig. 1 and 2, the first return air channel cavity 10 is formed in the first return air pipe 1; the second return air passage chamber 20 is formed in the second return air pipe 2.
In some cases, as shown in fig. 1, the first air return pipe 1 may be an air return pipe disposed outside the needle tube, and in other cases, as shown in fig. 2, the mandrel 5 may be reused as the first air return pipe 1;
In one example, the first air return pipe 1 is located inside the cryoablation needle, and the air return is discharged through the rear end of the cryoablation needle, in other examples, the first air return pipe 1 may also be located at the cryoablation needle and the host machine section, and the air return is discharged through the cryoablation needle and the host machine.
Referring to fig. 5, the first valve structure 31 in the valve assembly 3 includes a phase change spring 310, a first valve core 311, a first valve housing 312 and a first sealing ring 313;
The first valve core 311 can slide along the inner wall of the first valve housing 312, and the first end of the first valve housing 312 is provided with a first valve sealing surface 3120; the first sealing ring 313 is mounted on the first valve element 311, and the first valve element is further provided with a first valve element air return hole 3122; the first end or the second end of the first valve housing 312 is connected to one end of the first muffler 1; a first end of the first valve core air return hole 3110 is connected to a first side of the first valve core 311 along the air return flow direction, and a second end of the first valve core air return hole 3122 is connected to a first interval between an outer wall of the first valve core 311 and an inner wall of the first valve housing 312; the first seal ring 313 is located between the first gap and the first valve sealing surface 3120;
In one example, the first valve core air return hole 3122 is provided at the first valve housing rear cover 3121 of the first valve housing 312.
In one example, the first valve element 311 has a first seal groove 3111 thereon, and the first seal 313 is mounted to the first seal groove 3111.
When the first valve element 311 is at the first valve element blocking position, the first valve sealing surface 3120 is in sealing contact with the first sealing ring 313 to block the first space from the second side of the first valve element 311 along the air return flowing direction, at this time, the first end of the first valve housing 312 is blocked, and the air return cannot be discharged through the first air return pipe 1;
When the first valve element 311 is at the first valve element non-blocking position, the first valve sealing surface 3120 is not in sealing contact with the first sealing ring 313, and the first interval is communicated with the second side of the first valve element 311 along the return air flowing direction, so that return air can be discharged through the first return air pipe 1;
One end of the phase change spring 310 is directly or indirectly connected to the first valve core 311, so as to drive the first valve core 311 to switch between the first valve core blocking position and the first valve core non-blocking position through the telescopic deformation of the phase change spring 310.
In one example, the phase change spring 310 is made of nickel-titanium alloy, and in other examples, the phase change spring 310 may be made of other memory alloys.
In one embodiment, when the return air temperature is higher than the threshold temperature, the phase change spring 310 is in an austenite form; when the return air temperature is lower than the threshold temperature, the phase change spring 310 is in a martensitic form.
The phase change spring 310 has elasticity in the austenite state, and the phase change spring 310 having elasticity cannot be stretched when the return air passes through, so that the return air can be kept flowing through the first return air channel chamber 10, and the phase change spring 310 has no elasticity in the martensite state, and the phase change spring 310 having no elasticity is stretched when the return air passes through, so that the first valve element 311 is driven to be in the first valve element blocking position, and the first return air channel chamber 10 can be controlled not to flow the return air.
In one embodiment, referring to fig. 5 and 6, the phase change spring 310 is installed in the first valve housing 312, and the other end of the phase change spring 310 is directly or indirectly connected to the second end of the first valve housing 312;
If the first end of the first valve housing 312 is connected to one end of the first muffler 1, then: the second end of the first valve housing 312 is provided with a first housing return air hole 3122, and the first housing return air hole 3122 is communicated to the first end of the annular cavity.
In one embodiment, referring to fig. 7 to 9, the first valve structure 31 of the valve assembly 3 further includes a phase change spring housing 314, the phase change spring 310 is installed in the phase change spring housing 314, one end of the phase change spring 310 is fixedly connected to the first end of the phase change spring housing 314, and the other end of the phase change spring 310 is connected to the first valve core 311 through a pull rod 315; the pull rod 315 passes through the interior of the first muffler 1;
If the second end of the first valve housing 312 is connected to one end of the first muffler 1, then: the second end of the phase-change spring housing 314 is connected to the other end of the first muffler 1, the first end of the phase-change spring housing 314 is provided with a phase-change spring housing air return hole 3141, and the phase-change spring housing air return hole 3141 is communicated to the first end of the annular cavity.
In one example, a phase change spring return air hole 3141 is provided in the phase change spring housing rear cover 3140 of the phase change spring housing 314.
In an example, the phase-change spring housing 314 is disposed at a front end of the first muffler 1 along the air-return flow direction, and the first valve housing 312 is disposed at a rear end of the first muffler 1 along the air-return flow direction. In other examples, the phase change spring housing 314 and the first valve housing 312 may be disposed at any position of the first return air channel chamber 10.
In one embodiment, referring to fig. 7 and 8, the valve assembly 3 further includes a compression spring 316, one end of the compression spring 316 is connected to the first valve core 311, the other end of the compression spring 316 is fixed relative to the first valve housing 312, and the compression spring 316 is capable of generating a force to bring the first valve core 311 close to the first valve core plugging position.
In an example, when the phase-change spring 310 is in an austenite state, the sum of the elastic force of the compression spring 316 and the acting force of the return air on the first valve element 311 is smaller than the elastic force of the phase-change spring 310, so that the first return air channel cavity 10 can be kept to circulate the return air, when the phase-change spring 310 is in a martensite state, the elastic force of the compression spring 316 is smaller than the acting force of the return air on the first valve element 311, the return air drives the first valve element 311 to be in a first valve element blocking position, and the compression spring 316 is compressed, so that the first return air channel cavity 10 can be closed to not circulate the return air.
In one embodiment, referring to fig. 8 and 10, the valve assembly 3 further includes a second valve structure 32, and the second valve structure 32 includes a second valve core 321, a second valve housing 322, and a second sealing ring 323;
The second valve core 321 is capable of sliding along the inner wall of the second valve housing 322, the inner wall of the second valve housing 322 near the first end has a second valve sealing surface 3220, the second end of the second valve housing 322 is provided with a second housing air return hole 3222, and the second housing air return hole 3222 is communicated with the second air return channel cavity 20;
The second sealing ring 323 is installed on the second valve core 321, and the second valve core 321 is further provided with a second valve core air return hole 3210; a first end of the second valve core air return hole 3210 is connected to a first side of the second valve core 321 along the air return flow direction, a second end of the second valve core air return hole 3210 is connected to a second space between an outer wall of the second valve core 321 and an inner wall of the second valve housing 322, and the second seal ring 323 is located between the second space and the second valve seal surface 3220;
In one example, the second valve element 321 has a second seal groove 3211, and the second seal 323 is mounted in the second seal groove 3211.
The second valve core 321 is connected to the first valve core 311 through a push-pull rod 33 so as to move along with the first valve core 311;
when the first valve element 311 is at the first valve element blocking position, the second valve sealing surface 3220 is not in sealing contact with the second sealing ring 323, and the second interval is communicated with the second side of the second valve element 321 along the circulation direction of the return air, so that the return air can be discharged through the second return air pipe 2;
When the first valve element 311 is in the first valve element non-blocking position, the second valve sealing surface 3220 is in sealing contact with the second sealing ring 323 to block the second space from the second side of the second valve element 321 along the air return flow direction, so that the first end of the second valve housing 322 is blocked, and the air return cannot be discharged through the second air return pipe 2.
In one example, the second valve housing 322 is disposed at the tail end of the first return air channel 10 along the return air flowing direction. In other examples, the second valve housing 322 may be disposed at any position of the first air return channel cavity 10 and the second air return channel cavity 20.
In one embodiment, referring to fig. 11 and 12, the second valve structure 32 of the valve assembly 3 further includes an extension spring 320, one end of the extension spring 320 is mounted on the second valve core 321, and the other end of the extension spring 320 is mounted on the second valve housing 322; the tension spring 320 is capable of generating a force that brings the second spool 321 close to the second spool blocking position;
In an example, when the second sealing surface 3220 is in sealing contact with the second sealing ring 323, the sum of the elastic force of the stretched spring 320 and the acting force of the return air on the second valve core 321 is smaller than the elastic force of the phase-change spring 310 in the austenitic state, so that the second return air channel cavity 20 can be kept from flowing the return air;
When the second sealing surface 3220 is not in sealing contact with the second sealing ring 323, the stretched elastic force of the stretching spring 320 is smaller than the acting force of the air return on the second valve core 321, and the air return drives the second valve core 321 to move in the air return flowing direction, so that the second sealing ring 323 is separated from the second valve sealing surface 3220, and the second valve core air return hole 3210 is communicated with the second housing air return hole 3222, so that the air return flowing of the second air return channel cavity 20 can be controlled.
In one embodiment, referring to fig. 8, 10 and 11, the first end of the second valve housing 3221 is directly or indirectly connected to the first end of the first valve housing 3121, wherein: the second valve housing 322 is of integral structure 312 with the first valve housing, or: the second valve housing 322 is assembled with the first valve housing 312.
In one embodiment, referring to fig. 8 and 10 to 12, the cryoablation needle with adjustable air return path further includes a total air return pipe 30, and the total air return pipe 30 is connected to the air outlet of the first air return channel cavity 10 and the air outlet of the second air return channel cavity 20;
For example, referring to fig. 3,4, 8 and 11, when the return air temperature is greater than the threshold temperature, all the return air is exhausted through the first return air path, or: part of the air is discharged through a first air return path, and the rest of the air is discharged through a second air return path; when the return air temperature is less than the threshold temperature, all return air is exhausted through the second return air path.
Wherein, the first return air path is: the return air is discharged after passing through the needle tube 9, the vacuum wall 7, the annular cavity, the first return air pipe 1, the first valve core return air hole 3110, the total return air hole 300 and the total return air pipe 30 in sequence; the second return air path is as follows: the return air is discharged after passing through the needle tube 9, the vacuum wall 7, the annular cavity, the second return air pipe 2, the second valve core return air hole 3210, the total return air hole 300 and the total return air pipe 30 in sequence.
In one embodiment, the cryoablation needle with adjustable return air path further comprises a controller and return air channel cavity temperature detection elements arranged in the first return air channel cavity 10 and the second return air channel cavity 20;
The valve assembly 3 comprises a first electric control valve for controlling the on-off of the first return air channel cavity 10; the valve assembly 3 further comprises a second electric control valve for controlling the on-off of the second return air channel cavity 20;
The return air channel cavity temperature detection element is used for detecting the return air temperature and feeding back the return air temperature to the controller;
The controller is electrically connected with the first electric control valve and the second electric control valve and is used for: when the return air temperature is higher than the threshold temperature, the first electric control valve is controlled to be opened so that all or part of return air can be discharged through the first return air channel cavity 10; and: and when the return air temperature is lower than the threshold temperature, the first electric control valve is controlled to be closed, and the second electric control valve is controlled to be opened, so that return air can be discharged through the second return air channel cavity 20.
In one example, the temperature detecting element of the air return channel cavity is disposed at the first end of the annular cavity and the air inlet end of the finned tube 6, and the temperature obtained by the temperature detecting element of the air return channel cavity at the air inlet end of the finned tube 6 is the threshold temperature.
In other examples, the temperature detecting element may be disposed only at the first end of the annular chamber for obtaining the return air temperature, and the threshold temperature is a temperature value obtained when the temperature of the first end of the annular chamber and the temperature of the air inlet end of the fin tube 6 are equal as found by the rule of the freezing experiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The cryoablation needle with the adjustable return air path is characterized by comprising a needle tube, a J-T groove, a finned tube, an air inlet tube, a mandrel, a first return air channel cavity, a second return air channel cavity and a valve assembly; the valve assembly includes a first valve structure; the J-T groove, the finned tube and the air inlet pipe are sequentially and fixedly connected to form an air inlet channel;
the partial inner wall of the needle tube is a vacuum wall; the core shaft stretches into the needle tube, an annular cavity is formed between the core shaft and the vacuum wall, the finned tube is wound on the outer side of the core shaft and is positioned in the annular cavity, and the outer ring of the finned tube is tightly attached to the vacuum wall;
the air inlet of the first air return channel cavity is directly or indirectly connected to the first end of the annular cavity; the first end of the annular cavity is one end of the annular cavity close to the J-T groove;
the air inlet of the second air return channel cavity is directly or indirectly connected to the second end of the annular cavity; the second end of the annular cavity is the end of the annular cavity away from the J-T groove;
The first valve structure is arranged at least one of the following parts of the first air return channel cavity: the air inlet end, the air outlet end, in the first air return channel cavity, be used for:
When the return air temperature is higher than the threshold temperature, controlling the first return air channel cavity to circulate return air so that part or all of the return air can be discharged through the first return air channel cavity; when the return air temperature is lower than a threshold temperature, controlling the first return air channel cavity not to circulate return air, so that the return air is discharged through the second return air channel cavity; wherein the return air temperature is indicative of a gas temperature at a first end of the annular cavity; the threshold temperature is matched with the air inlet temperature of the air inlet end of the fin tube;
the first air return channel cavity is formed in the first air return pipe;
The first air return pipe is an air return pipe arranged outside the needle tube, or: the mandrel is reused as the first muffler;
The first valve structure comprises a phase change spring, a first valve core, a first valve shell and a first sealing ring;
The first valve core can slide along the inner wall of the first valve shell, and a first valve sealing surface is arranged in the first end of the first valve shell; the first sealing ring is arranged on the first valve core, and the first valve core is also provided with a first valve core air return hole; the first end or the second end of the first valve shell is connected with one end of the first muffler; the first end of the first valve core air return hole is communicated to the first side of the first valve core along the air return flowing direction, the second end of the first valve core air return hole is communicated with a first interval between the outer wall of the first valve core and the inner wall of the first valve shell, and the first sealing ring is positioned between the first interval and the first valve sealing surface;
when the first valve core is positioned at a first valve core plugging position, the first valve sealing surface is in sealing contact with the first sealing ring to isolate the first interval from the second side of the first valve core along the return air flowing direction, so that the return air cannot be discharged through the first return air pipe;
when the first valve core is positioned at a first valve core non-blocking position, the first valve sealing surface is in unsealed contact with the first sealing ring, and the first interval is communicated with the second side of the first valve core along the return air flowing direction so that return air can be discharged through the first return air pipe;
one end of the phase change spring is directly or indirectly connected with the first valve core so as to drive the first valve core to switch between the first valve core blocking position and the first valve core non-blocking position through the telescopic deformation of the phase change spring;
the phase change spring is arranged in the first valve shell, and the other end of the phase change spring is directly or indirectly connected with the second end of the first valve shell;
The first end of the first valve shell is connected with one end of the first air return pipe, the second end of the first valve shell is provided with a first shell air return hole, and the first shell air return hole is communicated with the first end of the annular cavity;
The second air return channel cavity is formed in the second air return pipe; the valve assembly further comprises a second valve structure, wherein the second valve structure comprises a second valve core, a second valve shell and a second sealing ring;
The second valve core can slide along the inner wall of the second valve shell, the inner wall of the second valve shell close to the first end is provided with a second valve sealing surface, the second end of the second valve shell is provided with a second shell air return hole, and the second shell air return hole is directly or indirectly communicated with the second air return channel cavity;
The second sealing ring is arranged on the second valve core, and a second valve core air return hole is further formed in the second valve core; the first end of the second valve core air return hole is communicated to the first side of the second valve core along the air return flowing direction, the second end of the second valve core air return hole is communicated to a second interval between the outer wall of the second valve core and the inner wall of the second valve shell, and the second sealing ring is positioned between the second interval and the second valve sealing surface;
the second valve core is connected with the first valve core through a push-pull rod so as to move along with the first valve core;
When the first valve core is positioned at the first valve core plugging position, the second valve sealing surface is in unsealed contact with the second sealing ring, and the second interval is communicated with the second side of the second valve core along the return air flowing direction so that return air can be discharged through the second return air pipe;
when the first valve core is positioned at the non-blocking position of the first valve core, the second valve sealing surface is in sealing contact with the second sealing ring to block the second interval from the second side of the second valve core along the air return flowing direction, so that the air return cannot be discharged through the second air return pipe;
The device also comprises a controller and a return air channel cavity temperature detection element; the valve assembly comprises a first electric control valve for controlling the on-off of the first return air channel cavity; the valve assembly further comprises a second electric control valve for controlling the on-off of the second return air channel cavity;
The return air channel cavity temperature detection element is used for detecting the return air temperature and feeding back the return air temperature to the controller;
the controller is electrically connected with the first electric control valve and the second electric control valve and is used for:
When the return air temperature is higher than the threshold temperature, the first electric control valve is controlled to be opened, so that all or part of return air can be discharged through the first return air channel cavity; and: and when the return air temperature is lower than the threshold temperature, controlling the first electric control valve to be closed and controlling the second electric control valve to be opened so that the return air can be discharged through the second return air channel cavity.
2. The adjustable return air path cryoablation needle of claim 1 wherein the phase change spring is in an austenitic state when the return air temperature is above the threshold temperature; and when the return air temperature is lower than the threshold temperature, the phase change spring is in a martensitic form.
3. The adjustable return air path cryoablation needle of claim 1 wherein the first valve structure further comprises a phase change spring housing, the phase change spring is mounted in the phase change spring housing, one end of the phase change spring is fixedly connected to a first end of the phase change spring housing, and the other end of the phase change spring is connected to the first valve core through a pull rod;
the second end of the first valve shell is connected with one end of the first air return pipe, the second end of the phase-change spring shell is connected with the other end of the first air return pipe, and the pull rod penetrates through the first air return pipe; the first end of the phase change spring shell is provided with a phase change spring shell air return hole, and the phase change spring shell air return hole is communicated to the first end of the annular cavity.
4. The adjustable return air path cryoablation needle of claim 3 wherein the first valve structure further comprises a compression spring having one end connected to the first valve core and the other end positioned stationary relative to the first valve housing, the compression spring being capable of generating a force that causes the first valve core to approach the first valve core blocking position.
5. The adjustable return air path cryoablation needle of claim 1 wherein the second valve structure further comprises an extension spring having one end mounted to the second valve core and the other end mounted to the second valve housing, the extension spring being capable of generating a force that causes the second valve core to approach the second valve core blocking position.
6. The adjustable return air path cryoablation needle of claim 1 wherein the first end of the second valve housing is directly or indirectly connected to the first end of the first valve housing wherein: the second valve housing and the first valve housing are of an integral structure, or: the second valve housing is assembled with the first valve housing.
7. The adjustable return air path cryoablation needle of claim 1 further comprising a total return air tube connected to the air outlet of the first return air channel cavity and the air outlet of the second return air channel cavity.
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| CN202010767640.0A CN111759450B (en) | 2020-08-03 | 2020-08-03 | Cryoablation needle with adjustable return air path |
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| CN202010767640.0A CN111759450B (en) | 2020-08-03 | 2020-08-03 | Cryoablation needle with adjustable return air path |
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| RU2614104C1 (en) * | 2016-03-25 | 2017-03-22 | Общество с ограниченной ответственностью "МедСпецТруб" (ООО "МедСпецТруб") | Cryoprobe |
| TWI655401B (en) * | 2017-09-07 | 2019-04-01 | 進得展有限公司 | Refrigeration device and temperature control module thereof |
| US11628007B2 (en) * | 2018-09-14 | 2023-04-18 | Atricure, Inc. | Cryoprobe |
| CN109730763B (en) * | 2019-02-28 | 2024-11-22 | 上海导向医疗系统有限公司 | Split flexible cryoablation needle device |
| CN210582629U (en) * | 2019-06-21 | 2020-05-22 | 海杰亚（北京）医疗器械有限公司 | Cryoablation system |
| CN110507405B (en) * | 2019-08-13 | 2025-01-03 | 上海导向医疗系统有限公司 | Cryoablation needle with adjustable targeting area |
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| CN212308019U (en) * | 2020-08-03 | 2021-01-08 | 上海导向医疗系统有限公司 | Cryoablation needle with adjustable air return path |
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