CN107928783B - Cryoablation catheter, cryoablation operating device and cryoablation equipment - Google Patents
Cryoablation catheter, cryoablation operating device and cryoablation equipment Download PDFInfo
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- 238000002679 ablation Methods 0.000 claims abstract description 44
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- 210000004204 blood vessel Anatomy 0.000 claims description 7
- 239000002775 capsule Substances 0.000 abstract description 29
- 238000007710 freezing Methods 0.000 abstract description 22
- 230000008014 freezing Effects 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 19
- 230000003631 expected effect Effects 0.000 abstract description 5
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- 238000000034 method Methods 0.000 description 11
- 206010003658 Atrial Fibrillation Diseases 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
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- 238000007674 radiofrequency ablation Methods 0.000 description 5
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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
- A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
- A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
- A61B2018/00023—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids closed, i.e. without wound contact by the fluid
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00345—Vascular system
- A61B2018/00351—Heart
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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
- A61B2018/0262—Characteristics of handpieces or probes using a circulating cryogenic fluid
-
- 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 discloses a low-temperature ablation catheter, a low-temperature ablation operation device and low-temperature ablation equipment, which belong to the technical field of low-temperature ablation, wherein the low-temperature ablation catheter comprises a sleeve, a core tube and a capsule body, and the core tube is accommodated in the sleeve and can slide in the sleeve; the bag body is sleeved on the outer wall of the front end of the core tube, and is surrounded with the outer wall of the sleeve to form a cavity suitable for containing low-temperature fluid, and the bag body is suitable for moving under the drive of the core tube; the device also comprises at least two fluid channels which are arranged in the core tube, one end of each fluid channel is communicated with the bag body, and the other end of each fluid channel is communicated with the tail end of the core tube. The cryoablation catheter provided by the invention enables the freezing effect to be as consistent as possible with the expected effect, the freezing effect is controllable, the success rate of the operation can be improved, and the physical burden of a patient can be reduced.
Description
Technical Field
The invention relates to the technical field of ablation, in particular to a low-temperature ablation catheter, a low-temperature ablation operation device and low-temperature ablation equipment.
Background
Atrial fibrillation is a medical condition in which electrical activity of the heart is abnormal. The current medical community tends to consider that the electrical signals that cause atrial fibrillation originate in the cuffs outside the four pulmonary veins (two left veins and two right veins). Thus, one approach to treating atrial fibrillation is to isolate the sleeves outside of the pulmonary veins from electrical signals from and to the atrial tissue, typically by ablating portions of the myocardial tissue. Catheter ablation is currently the most commonly used method of ablating myocardial tissue. The catheter radio frequency ablation is one of catheter ablation, the catheter radio frequency ablation is that a radio frequency ablation catheter is sent into an atrium through a peripheral vein, high-frequency electromagnetic waves, namely radio frequency energy, are emitted at the connection part of the atrium and a pulmonary vein, the radio frequency energy is ablated for one circle along an opening of the pulmonary vein, the radio frequency energy generates heat to enable the temperature of muscle tissues of the peripheral atrium to rise, annular scars are formed, abnormal activation of the pulmonary vein causing atrial fibrillation attacks is blocked in the pulmonary vein, and the abnormal activation cannot be conducted to the left atrium, so that the aim of radically curing atrial fibrillation is fulfilled.
However, while rf ablation is capable of radical treatment of atrial fibrillation, there is also a risk as with other invasive procedures, the most serious complications include: pericardial tamponade: i.e., the operation center room is perforated. Although the complications are dangerous, the complications can be released through pericardial puncture drainage or surgical hemostasis; cerebral infarction: the reasons are mainly that the pre-operation patient has in the atrium that the thrombus is shed during or after operation, or the thrombus is formed because the mechanical contraction function of the atrium after operation is not completely restored.
Along with the disadvantages of radio frequency ablation, another catheter ablation, i.e., cryoablation, has evolved significantly in recent years. As shown in fig. 1, in the cryoablation, an ablation catheter with a balloon is sent to an atrium through a peripheral vein, when the catheter reaches the atrium, a low-temperature fluid is filled into the balloon, the balloon is opened and is contacted with a pulmonary vein opening, the relative sliding between the balloon and myocardial tissue is avoided by using the low-temperature adsorption effect, the myocardial tissue is further necrotized by using low temperature, and abnormal activation of the pulmonary vein causing the atrial fibrillation attack is blocked in the pulmonary vein. Compared with radio frequency ablation, the low-temperature ablation has the advantages of stable target point, good adhesion and the like, and more importantly, because the cryoablation is adopted, necrotic myocardial tissue can be absorbed by a body, so that the probability of embolism after the operation can be effectively reduced.
However, the front end of the cryoablation catheter in the prior art generally adopts a spherical soft capsule to store the cryogenic fluid, which has the following defects in actual use: the cooling liquid in the spherical soft bag shares a channel when being filled into the soft bag and when being released from the soft bag after freezing, the volume of the bag body is limited, the temperature of the bag body can be gradually increased in the process of myocardial contact, and in order to ensure that the cooling medium can still freeze myocardial tissues after the temperature is increased, the temperature of the cooling medium is only reduced, so that the freezing effect is deviated from the expected effect, and the recovery of a patient is influenced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the freezing effect of the low-temperature ablation catheter in the prior art is unexpected when the low-temperature ablation catheter is used for carrying out low-temperature ablation on myocardial tissue, and further provide the low-temperature ablation catheter with controllable freezing effect.
The invention aims to solve the other technical problem that the low-temperature ablation catheter overcomes the defect that the freezing effect is unexpected when the low-temperature ablation catheter is used for carrying out low-temperature ablation on myocardial tissues in the prior art, and further provides a low-temperature ablation operation device capable of controlling the freezing effect.
The invention aims to solve the other technical problem that the low-temperature ablation catheter overcomes the defect that the freezing effect is unexpected when the low-temperature ablation catheter is used for carrying out low-temperature ablation on myocardial tissues in the prior art, and further provides low-temperature ablation equipment capable of controlling the freezing effect.
Therefore, the technical scheme provided by the invention is as follows:
a cryoablation catheter comprising:
A sleeve;
a core tube accommodated in the sleeve and slidable therein;
the bag body is sleeved on the outer wall of the front end of the core tube, and is surrounded with the outer wall of the sleeve to form a cavity suitable for containing low-temperature fluid, and the bag body is suitable for moving under the drive of the core tube;
the fluid channels are arranged in the core tube, one end of each fluid channel is communicated with the bag body, and the other end of each fluid channel is communicated with the tail end of the core tube.
As a preferable technical scheme, the front end of the core tube is provided with an elastic part, the elastic part has a restoring elastic force for restoring the elastic part into at least one ring shape, and the bag body and the elastic part can be synchronously deformed.
As a preferable technical scheme, the elastic part is an elastic section arranged at the front end of the core tube, and the elastic section has a restoring elastic force for restoring the elastic section into at least one annular shape.
As a preferable embodiment, the elastic portion is an elastic member fitted in the core tube, and the elastic member has a restoring elastic force for restoring the front end of the core tube to at least one annular shape.
As a preferable embodiment, the elastic portion has a restoring elastic force for restoring the elastic portion to a spiral taper shape.
As a preferable technical scheme, the fluid channel communicated with the capsule body comprises at least one fluid channel with one end communicated with the front end of the capsule body and at least one fluid channel communicated with the root of the capsule body.
As a preferable technical scheme, the core tube can drive the capsule body to retract into the sleeve, and the capsule body can be elastically deformed into a shape which can be accommodated in the sleeve under the restriction of the sleeve.
As a preferred solution, the core tube is further provided with a guide cavity extending along the length direction of the core tube, and the guide cavity can slide along a guide wire which is pre-placed in the blood vessel.
As a preferable technical scheme, the front end of the core tube is provided with a sensor.
As a preferable technical scheme, the mapping electrode is arranged at the front section of the core tube.
As a preferable technical scheme, the mapping electrode is linear, and the outer wall of the mapping electrode is provided with a bulge.
As a preferred solution, the core tube has a wire cavity adapted to receive a wire, which is electrically connected to the mapping electrode or the sensor.
A cryoablation procedure instrument comprising:
the handle is connected with the low-temperature ablation catheter in the technical scheme;
the actuator is connected with the core tube in the technical scheme and is suitable for driving the core tube to slide in the sleeve.
A cryoablation apparatus comprising a cryoablation catheter as described in the foregoing aspects, or a cryoablation procedure instrument.
The technical scheme of the invention has the following advantages:
1. In the technical scheme provided by the invention, the low-temperature ablation catheter comprises a sleeve, a core tube and a capsule body, wherein the core tube is accommodated in the sleeve and can slide in the sleeve; the bag body is sleeved on the outer wall of the front end of the core tube, and is surrounded with the outer wall of the sleeve to form a cavity suitable for containing low-temperature fluid, and the bag body is suitable for synchronous deformation under the drive of the core tube; the device also comprises at least two fluid channels, wherein the fluid channels are arranged in the core tube, and one end of each fluid channel is communicated with the capsule body, and the other end of each fluid channel is communicated with the tail end of the core tube. When the invention is used for carrying out cryoablation, the core tube and the capsule body are positioned in the sleeve at the initial stage, the front end of the sleeve is guided into an atrium through an artery or a vein, and the handle and the actuator are operated, so that the core tube drives the capsule body to extend out of the sleeve. And then filling the low-temperature fluid into the bag body by using one fluid channel, and flowing out of the other fluid channel after filling the bag body, so that the low-temperature fluid is circulated. In the process, the low-temperature fluid is always circulated in the bag body, so that the low-temperature fluid can be set to be in a constant-temperature state when being filled, and the temperature attenuation amplitude of the low-temperature fluid is also constant in the process of contacting the bag body with myocardial tissue, so that the myocardial tissue can be ensured to be always in a nearly constant temperature in the freezing process, the freezing effect is consistent with the expected effect as much as possible, and the freezing effect is controllable.
2. According to the technical scheme provided by the invention, the front end of the core tube is provided with the elastic part, the elastic part is provided with the recovery elastic force for recovering the elastic part into at least one annular shape, and the bag body and the elastic part can be synchronously deformed. Under the drive of the elastic part, the bag body can be deformed into a ring shape after extending out of the sleeve, after the ring-shaped bag body is attached to myocardial cells of an atrium, the myocardial cells around a pulmonary vein inlet can be subjected to ring-shaped ablation, and the annular necrotic myocardial cells can isolate electrical signals between the pulmonary vein and the atrium and further cure atrial fibrillation. The advantage of this scheme lies in, owing to the bag body has become annular to can effectually reduce the contact area of blood and bag body in the atrium, avoid the reduction of blood temperature in the atrium, reduce patient's physical burden. Meanwhile, the heat exchange efficiency between the myocardial tissue and the low-temperature fluid can be improved, the temperature attenuation amplitude of the low-temperature fluid can be further reduced, and the predictability of the freezing effect can be improved.
3. In the technical scheme provided by the invention, the elastic part is an elastic section arranged at the front end of the core tube, and the elastic section has a restoring elastic force for restoring the elastic section into at least one annular shape. After the elastic part is designed into the form, the elastic section and the core pipe can be integrally formed, so that risks of mutual separation, dislocation of installation positions and the like caused by the fact that the elastic part and the core pipe are two parts are reduced.
4. In the technical scheme provided by the invention, the elastic part is an elastic element embedded in the core tube, and the elastic element has at least one annular restoring elastic force for restoring the front end of the core tube. After the elastic part is designed into the form, the elastic element and the core tube are respectively two parts, so that when the parameters such as the elasticity and the deformation of the elastic part are required to be adjusted, the adjustment of the corresponding parameters of the elastic element can be realized, the limitation of the material of the core tube is avoided, and the separated elastic element and the core tube are easier to manufacture under the prior technical condition.
5. In the technical scheme provided by the invention, the elastic part has a restoring elastic force for restoring the elastic part into a spiral cone shape. The bag body is also deformed into a spiral cone shape under the drive of the elastic part. When the spiral cone-shaped capsule body is attached to the pulmonary vein entrance of the atrium, the spiral cone-shaped capsule body is provided with a plurality of circular rings, so that myocardial tissues can be subjected to covered freezing, the myocardial tissues around the pulmonary vein entrance are completely subjected to low-temperature ablation, the condition that the myocardial tissues are possibly subjected to incomplete ablation during annular ablation is avoided, and the success rate of the operation is further improved.
6. In the technical scheme provided by the invention, the fluid channel communicated with the balloon comprises at least one fluid channel with one end communicated with the front end of the balloon and at least one fluid channel communicated with the root of the balloon. When the connecting ends of the fluid channel and the bag body are respectively positioned at the front end and the root of the bag body, the low-temperature fluid can be respectively introduced into or discharged from the front end and the root of the bag body, so that the low-temperature fluid in the bag body can be circulated more thoroughly.
7. In the technical scheme provided by the invention, the core tube can drive the capsule body to retract into the sleeve, and the capsule body is elastically deformed into a shape capable of being accommodated in the sleeve under the restriction of the sleeve. After the capsule body is accommodated in the sleeve, the low-temperature ablation catheter can be ensured to smoothly enter the atrium by utilizing the blood vessel, and further the smooth operation is ensured.
8. In the technical scheme provided by the invention, the core tube is also internally provided with a guide cavity extending along the length direction of the core tube, and the guide cavity can slide along a guide wire which is pre-arranged in a blood vessel. The guide cavity can be used for enabling the ablation catheter to slide along the guide wire which is stretched into the atrium in advance, so that the ablation catheter can be ensured to smoothly and rapidly enter the atrium.
9. In the technical scheme provided by the invention, the mapping electrode is linear, and the outer wall of the mapping electrode is provided with a bulge. The pulmonary vein isolation condition can be monitored in real time by using the mapping electrode, and the convex electrode on the mapping electrode can ensure that the mapping electrode is in good contact with heart tissue.
In conclusion, the cryoablation catheter provided by the invention enables the freezing effect to be as consistent as possible with the expected effect, the freezing effect is controllable, the success rate of the operation can be improved, and the physical burden of a patient can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art cryoablation catheter operating in an atrium;
FIG. 2 is a perspective view of the cryoablation catheter provided in example 1 of the present invention;
FIG. 3 is a front view of the cryoablation catheter shown in FIG. 2;
FIG. 4 is a schematic view of the balloon of the cryoablation catheter of FIG. 2 in a configuration within a sleeve;
FIG. 5 is a cross-sectional view of the structure of the sleeve and core tube of the cryoablation catheter shown in FIG. 2;
reference numerals illustrate:
1-cannula, 2-balloon, 3-core tube, 4-sensor, 5-mapping electrode, 31-fluid channel, 32-guide lumen, 33-guide lumen.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1:
For example 1 of the present invention, a cryoablation catheter is provided for partially ablating myocardial tissue. The embodiment comprises a sleeve 1, a core tube 3 and a capsule body 2, wherein the core tube 3 is accommodated in the sleeve 1 and can slide in the sleeve 1; the bag body 2 is sleeved on the outer wall of the front end of the core tube 3 and is surrounded with the outer wall of the sleeve 1 together to form a cavity suitable for containing low-temperature fluid, and the bag body 2 is suitable for synchronous deformation under the drive of the core tube 3; the device also comprises at least two fluid channels 31, wherein the fluid channels 31 are arranged in the core tube 3, and one end of each fluid channel 31 is communicated with the capsule body 2, and the other end of each fluid channel is communicated with the tail end of the core tube 3.
When the invention is used for carrying out cryoablation, the core tube 3 and the capsule body 2 are positioned in the sleeve 1 at the initial stage, the front end of the sleeve 1 is guided into an atrium through an artery or a vein, and the handle and the actuator are operated, so that the core tube 3 drives the capsule body 2 to extend out of the sleeve 1. The bladder 2 is then filled with a cryogenic fluid through one of the fluid passages 31, and the cryogenic fluid flows out of the other fluid passage 31 after filling the bladder 2, thereby circulating the cryogenic fluid. In the above process, since the low-temperature fluid is always circulated in the capsule body 2, the low-temperature fluid can be set to a constant temperature state during filling, and the temperature attenuation amplitude of the low-temperature fluid is also constant in the process of contacting the capsule body 2 with myocardial tissue, the myocardial tissue can be ensured to be always at a nearly constant temperature in the freezing process, so that the freezing effect is consistent with the expected effect as much as possible, and the freezing effect is controllable.
As an improved embodiment of the ablation catheter, the front end of the core tube 3 is provided with an elastic part, the elastic part has a restoring elastic force for restoring the core tube into at least one ring shape, and the capsule body 2 can be synchronously deformed with the elastic part. Under the drive of the elastic part, the bag body 2 can be deformed into a ring shape after extending out of the sleeve 1, after the ring-shaped bag body 2 is attached to myocardial cells of an atrium, the myocardial cells around a pulmonary vein inlet can be subjected to ring-shaped ablation, and the annular necrotic myocardial cells can isolate electrical signals between the pulmonary vein and the atrium and further cure atrial fibrillation. The advantage of this scheme lies in, owing to the cyst body 2 has become annular to can effectually reduce the contact area of blood and cyst body 2 in the atrium, avoid the reduction of blood temperature in the atrium, reduce patient's physical burden. Meanwhile, the heat exchange efficiency between the myocardial tissue and the low-temperature fluid can be improved, the temperature attenuation amplitude of the low-temperature fluid can be further reduced, and the predictability of the freezing effect can be improved.
As a specific embodiment of the elastic portion, the elastic portion is an elastic segment provided at the front end of the core tube 3, the elastic segment having a restoring elastic force to restore it to at least one ring shape. After the elastic part is designed into the form, the elastic section and the core pipe 3 can be integrally formed, so that risks of mutual separation, dislocation of installation positions and the like caused by the fact that the elastic part and the core pipe 3 are two parts are reduced.
As an alternative embodiment of the elastic part, the elastic part is an elastic element fitted in the core tube 3, the elastic element having a restoring elastic force that restores the front end of the core tube 3 to at least one ring shape. After the elastic part is designed into the above form, the elastic element and the core tube 3 are respectively two parts, so that when the parameters such as the elasticity and the deformation of the elastic part are required to be adjusted, the adjustment of the corresponding parameters of the elastic element can be realized, the limitation of the material of the core tube 3 is avoided, and the separated elastic element and the core tube 3 are easier to manufacture under the prior technical condition.
As an important improvement embodiment of the cryoablation catheter, the elastic portion has a restoring elastic force that restores it to a spiral taper. The capsule body 2 is also deformed into a spiral cone shape under the drive of the elastic part. When the spiral cone-shaped bag body 2 is attached to the pulmonary vein entrance of an atrium, as the spiral cone-shaped bag body is provided with a plurality of circular rings, myocardial tissues can be subjected to covered freezing, the myocardial tissues around the pulmonary vein entrance are completely subjected to low-temperature ablation, the situation that the myocardial tissues are possibly subjected to incomplete ablation during annular ablation is avoided, and the success rate of the operation is further improved.
As an improved embodiment of the fluid channel 31, the fluid channel 31 communicated with the bladder 2 comprises at least one fluid channel 31 with one end communicated with the front end of the bladder 2, and at least one fluid channel 31 communicated with the root of the bladder 2. When the connection ends of the fluid channel 31 and the capsule body 2 are respectively located at the front end and the root of the capsule body 2, the low-temperature fluid can be respectively introduced into or discharged from the front end and the root of the capsule body 2, so that the low-temperature fluid in the capsule body 2 can be circulated more thoroughly.
As an improved embodiment of the cryoablation catheter, the core tube 3 can drive the balloon 2 to retract into the sleeve 1 and elastically deform to a shape capable of being accommodated in the sleeve 1 under the restriction of the sleeve 1. After the bag body 2 is accommodated in the sleeve 1, the low-temperature ablation catheter can be ensured to smoothly enter an atrium by utilizing a blood vessel, and further the smooth operation is ensured.
As an improved embodiment of the cryoablation catheter, the core tube 3 is also provided with a guide cavity 32 extending along the length direction of the core tube 3, and the guide cavity 32 can slide along a guide wire which is pre-placed in a blood vessel. The guide lumen 32 allows the ablation catheter to slide along a guidewire that has been advanced into the atrium, ensuring that the ablation catheter is advanced into the atrium smoothly and quickly.
As a modified embodiment of the cryoablation catheter, the front end of the core tube 3 is provided with a sensor 4. The sensor 4 may be provided in plural numbers and may have various types of parameters for monitoring the temperature, blood pressure, and contact with the body of the patient. The front section of the core tube 3 is also provided with a mapping electrode 5. The mapping electrode 5 is linear, and the outer wall of the mapping electrode 5 is provided with a bulge. The isolation condition of the pulmonary vein electric signals can be monitored in real time by using the mapping electrode 5, and the convex electrode on the mapping electrode 5 can ensure that the mapping electrode 5 has good contact with heart tissues. The core tube has a wire lumen 33 adapted to receive a wire that is electrically connected to a mapping electrode or sensor.
Example 2:
The present embodiment provides a cryoablation apparatus including: a handle connected to the cryoablation catheter of example 1; an actuator is connected to the core tube 3 of example 1 and is adapted to drive the core tube 3 to slide within the sleeve 1. During the operation, the handle is used for operating the cryoablation catheter to enter the vicinity of the target tissue along the guide wire which is pre-stretched into the atrium, along the blood vessel from the opening of the body surface. Then, the front end of the core tube 3 is pushed out of the sleeve 1 by the actuator, the capsule body 2 is filled with the low-temperature fluid, and the ablation is started after the capsule body 2 is attached to the target tissue.
Since this embodiment includes the cryoablation catheter of embodiment 1, the corresponding advantages of the cryoablation catheter of embodiment 1 are also provided.
Example 3:
The embodiment provides a cryoablation device, when the device itself has a handle and an operation device such as a driver, the cryoablation device can be smoothly operated by connecting with the cryoablation catheter in embodiment 1; when the apparatus itself is not provided with a real handle, an actuator, or the like, it is necessary to connect with the cryoablation operation device provided in embodiment 2 to perform the cryoablation.
Since this embodiment includes the cryoablation catheter in embodiment 1 or the cryoablation operating device in embodiment 2, the corresponding advantages of the cryoablation catheter in embodiment 1 or the cryoablation operating device in embodiment 2 are also provided.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (13)
1. A low-temperature ablation catheter which comprises a catheter body, characterized by comprising the following steps:
A sleeve;
a core tube accommodated in the sleeve and slidable therein;
the bag body is sleeved on the outer wall of the front end of the core tube, and is surrounded with the outer wall of the sleeve to form a cavity suitable for containing low-temperature fluid, and the bag body is suitable for moving under the drive of the core tube;
the fluid channels are arranged in the core tube, one end of each fluid channel is communicated with the bag body, and the other end of each fluid channel is communicated with the tail end of the core tube;
The front end of the core tube is provided with an elastic part, the elastic part is provided with at least one annular restoring elastic force, and the bag body can generate the same deformation with the core tube after extending out of the sleeve under the drive of the elastic part.
2. The cryoablation catheter as recited in claim 1 wherein the resilient portion is a resilient section disposed at the forward end of the core tube, the resilient section having a restoring spring force that restores it to at least one loop shape.
3. The cryoablation catheter as recited in claim 1 wherein the resilient portion is a resilient member embedded within the core tube, the resilient member having a restoring spring force that restores the forward end of the core tube to at least one annular shape.
4. A cryoablation catheter as in claim 2 or 3 wherein the resilient portion has a restoring spring force that returns it to a spiral taper.
5. The cryoablation catheter as recited in claim 1 wherein the fluid passages communicating with the balloon include at least one fluid passage having one end communicating with the forward end of the balloon and at least one fluid passage communicating with the root of the balloon.
6. The cryoablation catheter as recited in claim 1 wherein the core tube is adapted to retract the balloon within the sleeve and to elastically deform under the restriction of the sleeve to a shape receivable within the sleeve.
7. The cryoablation catheter as recited in claim 1 wherein the core tube further has a guide lumen extending along the length of the core tube, the guide lumen being slidable along a guidewire pre-positioned within the blood vessel.
8. The cryoablation catheter as recited in claim 1 wherein the core tube forward end is provided with a sensor.
9. The cryoablation catheter as recited in claim 1 wherein the core tube forward section is fitted with a mapping electrode.
10. The cryoablation catheter as recited in claim 9 wherein the mapping electrode is linear and wherein the mapping electrode has protrusions on an outer wall.
11. The cryoablation catheter as recited in any one of claims 8 to 10 wherein the core tube has a guidewire lumen adapted to receive a guidewire, the guidewire being electrically connected to a mapping electrode or sensor.
12. A low-temperature ablation operating device, characterized by comprising the following steps:
a handle connected to the cryoablation catheter as recited in any one of claims 1-11;
an actuator connected to the core tube of any one of claims 1 to 11 and adapted to drive the core tube to slide within the sleeve.
13. A cryoablation apparatus comprising the cryoablation catheter as recited in any one of claims 1-11 or the cryoablation operating device of claim 12.
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| CN109199569A (en) * | 2018-09-30 | 2019-01-15 | 姚雪松 | A kind of ablation protective separation device and ablation apparatus |
| CN111759449B (en) * | 2020-06-19 | 2021-08-13 | 首都医科大学附属北京潞河医院 | Freezing device and tumor ablation equipment |
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