Basket skeleton, basket balloon, basket electrode assembly and basket catheterTechnical Field
The application relates to the technical field of medical appliances, in particular to a basket framework, a basket bag, a basket electrode assembly and a basket catheter.
Background
Atrial fibrillation (atrial fibrillation) is one of the most common cardiac arrhythmias in clinic and is characterized by the loss of orderly electrical activity under the control of sinus rhythm in the atrium, instead of rapidly disordered fibrillation waves, the atrium thus loses effective contraction and relaxation, pump function worsens or is lost, and causes the extremely irregular response of the ventricle, which is one of the main causes of sudden cardiac death.
The effective treatment means of atrial fibrillation mainly comprises two major categories, namely drug treatment and non-drug treatment, wherein the drug treatment is mainly applicable to patients suffering from first-diagnosis atrial fibrillation and paroxysmal atrial fibrillation without related contraindications, the ventricular heart rate can be controlled mainly through the drug treatment, the basic heart functions such as beta receptor blocker, amiodarone, digitalis and the like are ensured, and the non-drug treatment mainly comprises anticoagulation treatment, electrical cardioversion, surgical maze operation and interventional treatment.
Interventional diagnosis and treatment is a modern medical technology rapidly popularized in recent decades, and a channel is generally established between a lesion site and an external operation end in a patient body by means of catheter devices with various structures, shapes and sizes so as to introduce various medical instruments, medicines and implantation instruments to the lesion site of the patient or to lead out body fluid and the like of the lesion site. In the medical field, there are a number of interventional catheter devices, such as guide catheters, delivery sheaths, drainage catheters, etc. Interventional catheters typically have a lumen through which drugs, bodily fluids, and instruments may pass. Due to the tortuous nature of the cardiovascular circulatory system of the human body, interventional catheters generally must have good flexibility, torque control, guidance and adequate axial and radial support. In addition, in the design and manufacturing process of the interventional catheter, the distal end of the catheter is manufactured into different bending shapes according to different expected uses so as to adapt to the anatomical shape of the lumen of a specific lesion, the orifice of the distal end of the catheter is aligned to the lesion, and the instruments or medicines in the catheter are accurately guided to the lesion. In recent years, a variety of distal pre-shaped interventional catheters have been developed and used in clinical therapy.
However, in the clinical use process, the individuation difference of the anatomical structure of the human body lumen is often encountered, even if the distal end pre-shaping sheath tube is designed according to the specific physiological anatomical structure of the human body, the distal end pre-shaping sheath tube is difficult to adapt to the individuation anatomical structure of the human body lumen, the operation process is hindered, the operation effect is further affected, and in order to prevent the problem in the operation process, doctors usually prepare several distal end pre-shaping sheath tubes with different specifications. Once the selected catheter has been found to have an unsuitable distal shape for the lesion, the catheter is withdrawn from the lumen, a pre-shaped catheter of other gauge is selected, and the procedure is repeated for insertion into the lumen. Sometimes, the distal end of the sheath is reshaped to the desired shape at the surgical site, even according to the patient's anatomy. Thus, the expense incurred by the patient is undoubtedly increased, the complexity of the surgical procedure is increased, and the exposure time of the patient to the X-ray environment is prolonged, which is unfavorable for the health of the patient.
Basket catheters commonly used in the prior art are mostly standard spherical, and the top end of the basket catheter possibly causes harm to human bodies. In addition, because the basket is usually the soft substrate of nickel titanium material, deformation easily takes place, influence result of use, there is the sacculus that adopts in the prior art to make the support, but the sacculus shape of general use is the sphere, for example the patent application of publication number CN114343831A, its figure can see that its use is the sphere sacculus, this kind of sphere sacculus can't laminate the basket shape well, can't reach sufficient good supporting effect, more importantly, sacculus and basket are close poorly, can to a great extent influence the effect of ablation discharge, so, optimize the reliability of sacculus and basket, help improving the success rate of operation.
Disclosure of Invention
The application aims to provide a basket framework, a basket electrode assembly and a basket catheter, wherein the top end of the basket framework is not easy to cause injury to a human body, and the safety is higher.
Another object of the present application is to provide a basket ball bladder, a basket electrode assembly, and a basket catheter with a bladder support, which have good reliability of the bladder support.
The technical scheme includes that the basket framework comprises a connecting ring and at least three strip-shaped elastic bodies, wherein the middle of the connecting ring is used for forming an instrument channel, the strip-shaped elastic bodies are arranged at intervals along the circumferential direction of the connecting ring, the strip-shaped elastic bodies are axially divided into a distal end and a proximal end along the connecting ring, the proximal ends of the strip-shaped elastic bodies are connected to a catheter body, the distal ends of the strip-shaped elastic bodies are bent inwards in the radial direction of the connecting ring to form a plane section, the free ends of the plane section are bent inwards in the proximal direction to form concave sections and then are connected to the connecting ring, the concave sections are used for enclosing a concave area, and the connecting ring is positioned in the concave area.
Preferably, a slot for connecting the concave section is arranged on one end of the connecting ring close to the proximal end or the outer side wall of the connecting ring.
Preferably, the distance from the plane section to the connecting ring along the axial direction of the connecting ring is 1mm-2mm.
Preferably, the depth of the concave area along the axial direction of the connecting ring is 1/3-1/2 of the radial dimension of the basket framework.
The application further provides a basket balloon which comprises a balloon body, wherein the balloon body is of an annular structure, the balloon body is divided into a first fixed section, a first deformation section, a second deformation section, a third deformation section and a second fixed section along the direction from the proximal end to the distal end, the first fixed section is connected with a medium input catheter and forms a seal, the second fixed section is connected with the connecting ring and forms a seal, the thickness of the first deformation section is equal or the thickness of the first deformation section is sequentially increased in the direction away from the first fixed section, the thickness of the second deformation section is sequentially increased in the direction away from the first deformation section, the third deformation section is bent in the direction from the interior of the balloon body, the thickness of the third deformation section is sequentially decreased in the direction away from the second deformation section, and the minimum thickness of the third deformation section is larger than the maximum thickness of the first deformation section.
Preferably, the second fixing section is folded back along the axial direction of the balloon towards the direction of the first fixing section, and the outer side of the second fixing section is bonded to the outer ring surface of the connecting ring.
Preferably, the minimum thickness of the first deformation section is greater than or equal to 0.2mm, the difference between the thickness of the second deformation section at the end far away from the first deformation section and the thickness of the first deformation section is 0.1mm-0.4mm, and the difference between the thickness of the second deformation section at the end far away from the first deformation section and the thickness of the third deformation section at the end far away from the second deformation section is 0.1mm-0.4mm.
Preferably, before the balloon is inflated, the distance from the third deformation section to the bottom of the concave section along the axial direction of the connecting ring is 1mm-2mm.
Preferably, the length of the first fixing section and the second fixing section along the axial direction of the connecting ring is 1mm-2mm.
Preferably, the radial distance between the first deformation section and the central axis of the balloon is gradually increased along the direction away from the first fixing section.
Preferably, the radial dimension of the balloon is smaller than the radial dimension of the concave region before the balloon is inflated.
The application also provides a basket electrode assembly, which comprises a basket framework and an electrode body, wherein the electrode body is arranged on the outer side of the plane section on the basket framework.
Preferably, a plurality of electrode bodies are arranged on each plane section at intervals along the length direction of the plane section.
Preferably, the basket electrode assembly further includes the basket balloon.
The application also provides a basket catheter, which comprises the basket electrode assembly.
Compared with the prior art, the application has the beneficial effects that (1) the far end of each strip-shaped elastomer is bent inwards along the radial direction of the connecting ring to form a plane section, and the front end of the basket framework is a plane under the action of the plane section, so that the electrode body arranged on the basket framework is in surface contact with the part of the human body to be ablated and discharged (the traditional spherical contact is point contact), and the contact area is higher (the more the actual contact area is, the better). Meanwhile, as the plane sections are radially arranged along the connecting ring, namely the formed plane at the front end of the basket framework is vertical to the axial direction of the connecting ring, the vertical supporting force is larger and more stable, and therefore the device is not easy to generate obvious deformation due to compression when contacting the discharge part to be ablated. In addition, the free end of the plane section is bent towards the proximal direction to form a concave section and then is connected to the connecting ring, the concave sections are used for enclosing a concave area, and the connecting ring is positioned in the concave area, so that under the action of the concave area, the far end of the strip-shaped elastic body or the connecting ring can not generate a protruding structure or a sharp protruding structure in the process of moving in a human body, and the protruding structure is not more difficult to generate, so that abrupt contact with a discharge part to be ablated is reduced, injury to the human body is avoided, and the safety is higher.
(2) In the balloon provided by the application, under the thickness difference effect of the first deformation section, the second deformation section and the third deformation section on the balloon, when the balloon is filled with a medium, the thickness of the first deformation section is the same as the thickness of the third deformation section (if the thickness of the third deformation section is the same as the thickness of the first deformation section, the first deformation section expands to gradually support the strip-shaped body), then, as the thickness of the second deformation section gradually increases in the direction away from the first deformation section, the thickness of the third deformation section gradually decreases in the direction away from the second deformation section, and the minimum thickness of the third deformation section is larger than or equal to the maximum thickness of the first deformation section, so that the thickness of a first point location is the same as the thickness of the third deformation section (if the minimum thickness of the third deformation section is the same as the maximum thickness of the first deformation section, namely the second deformation section is the junction, the second deformation section is pulled to the first point location, the second deformation section is the same as the second deformation section, the second deformation section is stretched to the junction, the second deformation section is stretched to the same as the first deformation section, the second deformation section is stretched to the junction, and the third deformation section is stretched to the same as the first deformation section, and the first deformation section is stretched to the junction, and the third deformation section is the junction, and the first deformation section is stretched to the second deformation section is the same as the first deformation section is the junction, and finally expanding to the outer side of the position for supporting the strip-shaped elastic body to form the concave area, finally enabling the balloon to gradually lean against the inner side of the strip-shaped elastic body step by step, realizing all fitting, enabling the electrode body on the outer side of the strip-shaped elastic body to better contact with the position needing discharge ablation by improving the fitting reliability of the balloon, reducing the diffusion of discharge ablation energy to other useless positions, and achieving high-efficiency discharge conversion.
(3) The beneficial effects of the basket electrode assembly and the basket catheter are the same as those of the basket skeleton and the basket balloon, and detailed description thereof is omitted.
Drawings
Fig. 1 is a perspective view of a basket framework provided by the application.
Fig. 2 is a cross-sectional view of the basket frame of fig. 1 provided by the present application.
Fig. 3 is an enlarged view of the balloon of fig. 2 provided by the present application.
Fig. 4 is a cross-sectional view of another balloon provided by the present application.
Fig. 5 is a cross-sectional view of yet another balloon provided by the present application.
Fig. 6 is a top view of a basket electrode assembly according to the present application.
Fig. 7 is a cross-sectional view of a partial structure of a basket catheter provided by the present application.
Fig. 8 is an enlarged view of a portion of the fig. 7 article at I provided by the present application.
Fig. 9 is an enlarged view of part II in fig. 7 provided by the present application.
Fig. 10 is a state diagram of the balloon of fig. 7 after inflation in accordance with the present application.
Fig. 11 is an enlarged view of a portion of fig. 10 at III, provided by the present application.
Fig. 12 is a view of the balloon of fig. 1 after inflation in accordance with the present application.
Fig. 13 is a view of the balloon of fig. 4 after inflation in accordance with the present application.
In the figure, 1, a basket framework; 11, connecting rings, 111, inserting grooves, 12, strip-shaped elastic bodies, 121, concave areas, 122, plane sections, 13, fixing rings, 14, a balloon, 141, a first fixing section, 142, a first deformation section, 143, a second deformation section, 144, a third deformation section, 145, a second fixing section, 2, an electrode body, 21, concentric circles, 3, a catheter body, 4, a medium input catheter and 5, an instrument catheter.
Detailed Description
The present application will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.
In the description of the present application, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present application that the device or element referred to must have a specific azimuth configuration and operation. The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, 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 but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Referring to fig. 1 to 2, an embodiment of the present application provides a basket frame 1, which comprises a connection ring 11 and at least three strip-shaped elastic bodies 12, wherein the middle part of the connection ring 11 is used for forming an instrument channel, the strip-shaped elastic bodies 12 are arranged at intervals along the circumferential direction of the connection ring 11, each strip-shaped elastic body 12 is axially divided into a distal end and a proximal end along the connection ring 11, the proximal end of each strip-shaped elastic body 12 is used for being connected to a catheter body 3, the distal end of each strip-shaped elastic body 12 is bent inwards along the connection ring 11 to form a plane section 122, the free end of the plane section 122 is bent inwards in the proximal direction to form a concave section and then is connected to the connection ring 11, each concave section is used for enclosing a concave area 121, and the connection ring 11 is positioned inside the concave area 121.
In the basket skeleton 1 of the present embodiment, since the distal ends of the strip-shaped elastic bodies 12 are bent inward along the radial direction of the connecting ring 11 to form the planar section 122, under the action of the planar section 122, the front end (i.e., the upper part in fig. 2) of the basket skeleton 1 is planar, so that the electrode body 2 (as shown in fig. 6) mounted thereon forms surface contact with the part to be ablated and discharged by the human body, and the contact area is higher (the more the better the actual contact area) than that of the conventional spherical contact (i.e., the point contact). Meanwhile, as the plane sections 122 are radially arranged along the connecting ring 11, namely, the formed plane at the front end of the basket framework 1 is vertical to the axial direction of the connecting ring 11, the vertical supporting force is larger and more stable, and therefore, the device is not easy to generate obvious deformation due to compression when contacting the discharge part to be ablated. In addition, the free ends of the plane sections 122 are bent in the proximal direction to form concave sections and then are connected to the connecting ring 11, the concave sections are used for enclosing a concave area 121, the connecting ring 11 is positioned in the concave area 121, under the action of the concave area 121, the far ends of the strip-shaped elastic bodies 12 or the connecting ring 11 can not generate a protruding structure or a sharp protruding structure in the process of moving in a human body, so that abrupt contact with a discharge part to be ablated is reduced, injury to the human body is avoided, and the safety is higher.
As shown in fig. 1, in the present embodiment, in order to enhance the effect of discharge ablation, the number of the strip-shaped elastic bodies 12 is preferably eight.
In this embodiment, as shown in fig. 8, a slot 111 is further provided on the connecting ring 11 near the proximal end of the strip-shaped elastic body 12 or on the outer side wall of the connecting ring 11 for inserting the distal end. The distal end of the strip-shaped elastic body 12 is preferably inserted from an end of the connection ring 11 near the proximal end of the strip-shaped elastic body 12.
In the present embodiment, as shown in fig. 2, the distance from the flat section 122 to the connection ring 11 along the axial direction of the connection ring 11 is most suitable when the distance is 1mm-2mm, the effect of avoiding abrupt contact is not obvious, and deformation of the basket frame 1 is easily caused.
As shown in fig. 2, in this embodiment, the depth of the concave area 121 along the axial direction of the connection ring 11 is most suitable when it is 1/3-1/2 of the radial dimension of the basket frame 1, and the concave section corresponding to this dimension is least prone to deformation in the human body.
In this embodiment, as shown in fig. 2, the free ends of the planar segments 122 are parallel to the axial direction of the connecting ring 11 when bent in the proximal direction.
It will be appreciated that the proximal ends of the strip-shaped elastic bodies 12 may be directly mounted and fixed on the catheter body 3, or the proximal ends of the strip-shaped elastic bodies 12 may be first integrated onto the fixing ring 13, and then the fixing ring 13 is mounted and fixed on the catheter body 3.
Example two
Referring to fig. 1 and 2, in order to support the basket frame 1, the balloon 14 is disposed inside each strip-shaped elastic body 12, the balloon 14 is used for supporting each strip-shaped elastic body 12 after being filled, and a relief channel is disposed on the balloon 14 corresponding to the position of the instrument channel in a penetrating manner. The support of each strip-like elastic body 12 is achieved by inflating the balloon 14 with a medium (e.g., liquid or gas) to inflate the balloon 14.
It should be understood that the present application is not limited to the specific configuration of balloon 14, and that only three specific configurations (i.e., configuration one, configuration two, and configuration three) are provided below for reference.
As shown in FIG. 3, the balloon 14 is of an annular structure, the balloon 14 is divided into a first fixed section 141, a first deformation section 142, a second deformation section 143, a third deformation section 144 and a second fixed section 145 along the direction from the proximal end to the distal end, the first fixed section 141 is connected with the medium input conduit 4 and forms a seal, the second fixed section 145 is connected with the connecting ring 11 and forms a seal, the thickness of the first deformation section 142 is equal or the thickness of the first deformation section 142 is sequentially increased in the direction away from the first fixed section 141, the radial distance between the first deformation section 142 and the central axis of the balloon 14 is sequentially increased in the direction away from the first fixed section 141, the thickness of the second deformation section 143 is sequentially increased in the direction away from the first deformation section 142, the third deformation section 144 is bent towards the inner direction of the balloon 14, the thickness of the third deformation section 144 is sequentially decreased in the direction away from the second deformation section 143, and the minimum thickness of the third deformation section 144 is larger than the maximum thickness of the first deformation section 142.
The working principle of the balloon 14 is that, with reference to fig. 2, 3 and 7 to 11, under the thickness difference of the first deformation section 142, the second deformation section 143 and the third deformation section 144, the first deformation section 142 is stretched first because the thickness of the first deformation section 142 is the smallest and is closer to the proximal end of the strip-shaped elastic body 12 in the process of filling the balloon 14 with the medium, so that the first deformation section 142 expands and gradually supports the strip-shaped body; then, since the thickness of the second deformation section 143 gradually increases in a direction away from the first deformation section 142, and the thickness of the third deformation section 144 gradually decreases in a direction away from the second deformation section 143, the minimum thickness of the third deformation section 144 is greater than or equal to the maximum thickness of the first deformation section 142, so that there is a point on the first deformation section 142 that has the same thickness as the minimum thickness of the third deformation section 144 (if the minimum thickness of the third deformation section 144 is equal to the maximum thickness of the first deformation section 142, the point is at the junction point of the second deformation section 143 and the first deformation section 142), that is, with the point as a limit, when the position of the balloon 14 that is stretched and expanded is transferred to the point, stretching deformation starts to occur at the position of the minimum thickness of the third deformation section 144 (i.e., the junction point between the third deformation section 144 and the second fixing section 145), at this point, the third deformation section 144 is synchronously expanded in the direction of the second deformation section 143 and the corresponding position on the second deformation section 143, so that the second deformation section 12 is pulled to the radially inner side of the strip-shaped elastic body 12, and finally the strip-shaped elastic body 12 is stretched out to the radially-shaped connection region 11, finally, the balloon 14 is gradually attached to the inner side of the strip-shaped elastic body 12 step by step, so that all attachment is realized (as shown in fig. 12), the electrode body 2 on the outer side of the strip-shaped elastic body 12 is better contacted with a position needing discharge ablation by improving the attachment of the balloon 14, the discharge ablation energy is reduced to be diffused to other useless positions, and high-efficiency discharge conversion is achieved.
As shown in fig. 3 and 8, the second fixing segment 145 is preferably folded back along the axial line of the balloon 14 in the direction in which the first fixing segment 141 is located, and the outer side of the second fixing segment 145 is bonded to the outer circumferential surface of the connection ring 11. Referring to fig. 11, under the action of the foldback structure, after the third deformation section 144 is stretched and expanded, the third deformation section is attached along the bending direction of the strip-shaped elastic body 12, and is tightly contacted with the strip-shaped elastic body 12, so that the balloon 14 is tightly attached to the inner wall of the strip-shaped elastic body 12, and the form of the strip-shaped elastic body 12 is supported and maintained, so that the strength of the strip-shaped elastic body 12 after forming a basket is enhanced, the shaping form of the basket is not changed, and the electrode body 2 is fully contacted with the inner wall of the focus position, and discharge ablation is performed, energy loss is reduced, and ablation effect is greatly improved. Meanwhile, electrode bodies 2 with different rings are matched, the number of the electrode bodies 2 is large, surface ablation is achieved, the position of point ablation is not needed to be particularly accurate, and the operation of a user is facilitated.
Wherein, as shown in fig. 3, the minimum thickness of the first deformation section 142 is preferably greater than or equal to 0.2mm, the difference between the thickness of the end of the second deformation section 143 far from the first deformation section 142 and the thickness of the first deformation section 142 is 0.1mm-0.4mm, and the difference between the thickness of the end of the second deformation section 143 far from the first deformation section 142 and the thickness of the end of the third deformation section 144 far from the second deformation section 143 is 0.1mm-0.4mm.
Wherein, as shown in fig. 3, the length of the first fixing segment 141 and the second fixing segment 145 along the axial direction of the connecting ring 11 is preferably 1mm-2mm.
As shown in FIG. 8, the distance from the third deformation section 144 to the bottom of the concave section along the axial direction of the connecting ring 11 is preferably 1mm-2mm before the balloon 14 is inflated, so as to avoid extrusion friction between the balloon 14 and the concave section.
Wherein, as shown in fig. 8, the radial dimension of balloon 14 is less than the radial dimension of concave region 121 prior to inflation of balloon 14. Since the basket frame 1 needs to be contracted first (i.e. the strip-shaped elastic body 12 is contracted towards the center in fig. 7) when entering the human body, the radial dimension of the balloon 14 is smaller than that of the concave region 121, so that extrusion friction between the balloon 14 and the strip-shaped elastic body 12 is avoided.
Second, as shown in fig. 4, the balloon 14 is shaped to match the "ear" shape of the strip-shaped elastomer 12, and the location corresponding to the second securing section 145 has no reentrant structure, which is also the most easily thought of structure in the design process. However, it has been found through experiments that, although the structural shape is more consistent with the shape of the strip-shaped elastic body 12, in the process of filling and expanding, compared with the first structure, the "ear" position in the second structure can support the strip-shaped elastic body 12 to deform and has poor reliability, as shown in fig. 13, either the top of the "ear" of the balloon 14 is not contacted with the inner side of the strip-shaped elastic body 12, or both sides of the "ear" of the balloon 14 are not reliable, the gap is large, and the strip-shaped elastic body 12 is easily supported to deform locally by synchronous amplification.
Third, as shown in fig. 5, the balloon 14 is in an ellipsoidal shape before filling, and two ends of the balloon are provided with open mounting structures in the same way as the first structure.
Example III
Referring to fig. 1,2 and 6, the present embodiment provides a basket electrode assembly including a basket frame 1 and an electrode body 2 in the first embodiment, the electrode body 2 being adapted to be disposed outside of a planar section 122 on the basket frame 1.
It should be understood that the installation manner of the electrode body 2 and the basket frame 1 and the working principle of the electrode body 2 are all in the prior art, and detailed description thereof is omitted herein.
In this embodiment, as shown in fig. 6, a plurality of electrode bodies 2 are provided on each planar segment 122 at intervals along the length direction thereof. At this time, the electrode bodies 2 located at the same position of the strip-shaped elastic bodies 12 are located on the same concentric circle 21, and the electrode bodies 2 located at different positions of the strip-shaped elastic bodies 12 are located on different circle-shaped concentric circles 21, so as to achieve the purpose of adapting to different working ranges.
In this embodiment, the basket electrode assembly may further include any of the balloons 14 of the second embodiment (i.e., the balloons 14 in either the first, second, or third configurations). Preferably a balloon 14 in configuration one.
Example IV
Referring to fig. 7-11, the present application also provides a basket catheter including the basket electrode assembly of the third embodiment.
It should be understood that the specific structure of the basket catheter is not limited, and reference is made to only one specific structure in which the proximal end of each strip-shaped elastic body 12 or the fixing ring 13 integrated at each proximal end is fixed on the catheter body 3 of the basket catheter, one end of the catheter body 3 far away from the strip-shaped elastic body 12 is provided with a handle, the instrument catheter 5 of the basket catheter is inserted into the catheter body 3, one end outer wall of the instrument catheter 5 is connected on the inner wall of the connecting ring 11 in a sealing manner, the other end of the instrument catheter 5 is connected with the handle, and the handle is provided with an operation part for operating the relative sliding of the instrument catheter 5 relative to the catheter body 3. When the relative sliding is generated between the instrument catheter 5 and the catheter body 3, the size of the propped shape of the strip-shaped elastic body 12 can be adjusted. A medium input conduit 4 is further arranged between the instrument conduit 5 and the conduit body 3, the outer wall of one end of the medium input conduit 4 close to the connecting ring 11 is adhered to the inner wall of the first fixing section 141, and a gap is formed between the inner wall of the medium input conduit 4 and the outer wall of the instrument conduit 5, so that liquid or gas medium can be conveniently input into the balloon 14 or can be conveniently discharged from the balloon 14.
It can be understood that the specific structure and working principle of the handle and the operation portion are all the prior art, and detailed description thereof is omitted herein.
The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the foregoing embodiments, but rather, the foregoing embodiments and description illustrate the principles of the application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, and such changes and modifications are intended to be included within the scope of the application as defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.