阅读说明：本技术 用于人体腔道脏器恶性肿瘤的适形可调的内放射膜性支架 (Conformal adjustable internal radioactive membranous stent for malignant tumor of human body cavity and organ ) 是由 刘全达 于 2021-06-01 设计创作，主要内容包括：本发明提供一种用于人体腔道脏器恶性肿瘤的适形可调的内放射膜性支架,该支架包括：采用弹性高分子材料制备而成的膜性本体,可单独使用或外套金属裸支架等应用方式；环绕覆膜本体的外壁一体凸设有阵列分布的密闭的容置巢,容置巢用以放置放射性粒子,可根据人体恶性肿瘤三维重建结果适形准确分布放射性粒子。本发明提供的用于人体腔道脏器恶性肿瘤的适形可调的内放射膜性支架,可个体化定制、可肿瘤适形、可装载/卸除放射性粒子、不易移位脱落且便于标准化生产,有效用于解除梗阻并精准内照射治疗恶性肿瘤。(The invention provides a conformal and adjustable inner radioactive membranous stent for malignant tumor of human body cavity and channel viscera, which comprises: the film body prepared by elastic high polymer material can be used independently or sheathed with metal bare stent and other application modes; the outer wall of the covering film body is integrally and convexly provided with closed accommodating nests which are distributed in an array mode, the accommodating nests are used for accommodating radioactive particles, and the radioactive particles can be properly and accurately distributed according to the three-dimensional reconstruction result of the malignant tumor of the human body. The conformal and adjustable internal radioactive membranous stent for malignant tumor of human body cavity viscera provided by the invention can be customized individually, can be shaped like tumor, can load/unload radioactive particles, is not easy to shift and fall off, is convenient for standardized production, and is effectively used for relieving obstruction and treating malignant tumor by accurate internal radiation.)

1. A conformable and adjustable endoradioactive membranous stent for malignant tumors of organs in the lumen of the human body, comprising:

the membrane body is prepared from an elastic high polymer material, at least one end of the membrane body is provided with a support hook, the outer wall of the membrane body is integrally and convexly provided with closed accommodating nests distributed in an array manner, and the accommodating nests are used for accommodating radioactive particles.

2. The conformal adjustable endoradioactive membranous scaffold for malignant tumor of organs in human body cavity and tract according to claim 1,

the accommodating nest is in a strip shape, and the inner cavity of the accommodating nest is in a cuboid or cylinder shape;

the accommodating nests are distributed in parallel with the axial direction of the membrane body, or the accommodating nests are distributed in a spiral shape obliquely surrounding the membrane body.

3. The conformable and adjustable endorf stent for malignant tumors in organs of body lumens and tracts according to claim 1, wherein the membranous stent comprises a nickel titanium memory alloy skeleton, and the membranous body integrally coats the skeleton when prepared and molded.

4. The conformable and adjustable endoradioactive membranous scaffold for malignant tumors of organs in cavities and canals of human bodies according to claim 3, wherein said skeleton is assembled by a plurality of axial wires and radial rings; or the framework is a spiral structure woven by nickel-titanium memory alloy wires; or the framework is a telescopic structure formed by weaving nickel-titanium memory alloy wires.

5. The conformable and adjustable endoradioactive membranous stent for malignant tumors of organs in cavities and canals of human bodies according to claim 1, wherein a bare stent made of nickel titanium memory alloy is arranged inside the membranous body.

6. The conformable and adjustable endoradioactive membranous stent for malignant tumors of organs in cavities and canals of human bodies according to claim 1, wherein said membranous body has a smooth inner surface.

7. The conformal adjustable endoradioactive membranous scaffold for malignant tumor of organs in human body cavity and tract according to claim 1,

the port of the membrane body is gradually expanded towards the outer side and is in a bell mouth shape; alternatively, the first and second electrodes may be,

the port of the membrane body gradually expands towards the outer side, so that the whole membrane body is in a dumbbell shape; alternatively, the first and second electrodes may be,

the whole membrane body is Y-shaped.

8. The conformable and adjustable endoradioactive membranous stent for human luminal visceral organ tumors as claimed in claim 1, wherein said stent hooks comprise hook wires or hook holes.

9. The conformable and adjustable endoradioactive membranous scaffold for malignant tumor of human body lumen viscera according to any one of claims 1 to 8, wherein said high molecular material is at least one of latex, polytetrafluoroethylene, silica gel and polyurethane; or the high polymer material is a composite high polymer material for combined application.

10. The conformable and adjustable endorf membranous stent for visceral organ tumor of human body as claimed in claim 9, further comprising a puncture needle, wherein said puncture needle comprises a puncture needle body, an inner core push rod and an elastic element;

the puncture needle body is tubular, the tail end of the puncture needle body is provided with a filling groove for placing radioactive particles, and the top end of the filling groove is a conical needle point;

the inner core push rod penetrates into the pricking pin body from the head end of the pricking pin body, the end part of the inner core push rod is pushed and resisted to the filling groove, the other end of the inner core push rod is provided with a thimble component, and the thimble component is positioned on the outer side of the head end of the pricking pin body; a fixed snap ring is arranged at a position of a preset distance, exposed out of the puncture needle body, of the inner core push rod, and is used for limiting the distance of the inner core push rod for pushing forwards, wherein the distance is just the distance of pushing the radioactive particles out of the filling groove;

the elastic piece is positioned in the puncture needle body, one end of the elastic piece is connected with the puncture needle body, and the other end of the elastic piece is connected with the inner core push rod, so that the elastic piece has the tendency of recovering the original shape after the inner core push rod is pushed to push out the radioactive particles positioned in the filling groove.

Technical Field

The invention relates to the field of medical instruments, in particular to a conformal and adjustable inner radioactive membranous stent for malignant tumors of organs of a human body cavity.

Background

The human body has many hollow organs, such as esophagus, stomach, small intestine, colon and rectum, biliary tract, trachea, bronchus, ureter, etc. Once these organs suffer from primary or metastatic malignant tumors and cannot be resected by surgery, obstruction of local channels often occurs, which brings serious harm to patients, for example, when esophagus is obstructed, food intake cannot be performed, intestinal tract is obstructed, exhaust and defecation cannot be performed, trachea obstruction can cause asphyxia, biliary tract obstruction can cause jaundice, ureter obstruction can cause hydronephrosis, thus causing damage and failure of multiple organ functions of the whole body, and death can be caused in serious cases.

Currently, the obstruction can be spread by placing a stent at the tumor to treat or alleviate the above problems. For example, in the case of malignant esophageal tumor, when the tumor cannot be resected by surgery, the esophagus is usually obstructed, and at this time, the patient cannot eat the normal diet through the mouth, and needs intestinal fistulization or intravenous nutrition support, and the patient cannot eat the diet through the mouth for a long time, so that serious physical and mental diseases can be followed, and the social, medical and economic costs are greatly increased. To address this problem, esophageal stents that strut tumor blockages may be selected to restore the oral diet. At present, the traditional commercial stent, such as an esophageal stent, only has the function of recanalizing the esophagus; scientific research personnel have also researched and developed the esophageal stent who has the radiotherapy function concurrently, can realize two functions simultaneously: 1) recanalizing the esophagus; 2) the internal irradiation tumor reduces local focus or delays tumor progression, thereby avoiding esophageal re-obstruction and obstruction.

However, the currently available internal radiation stents are mostly made of a bare metal stent or a covered stent as a main body, and are loaded with radioactive particles by manually binding radioactive particles or an external cuff-type pocket or covered with a cap after filling by using a tubular semi-open capsule. For example, application No. 201680060092X, a radioactive support is provided that secures the radioactive particles to the support by hand-binding; the application number is 2009102334843, the biliary tract irradiation stent provided is that a sleeve pocket is used for loading radioactive particles, and then the biliary tract irradiation stent is fixed on a metal stent; the biliary radiotherapy stent provided in application No. 2009102334843 is in the form of a tubular semi-open capsule. These approaches have a number of disadvantages: 1) the manual binding mode of radioactive particles has a rough process, is limited by radioactive particle material filling and manual techniques, has poor distribution planning of the filled radioactive particles, and cannot accurately arrange the positions of the radioactive particles as required, so that the curative effect is influenced; 2) in a binding or external pocket/tubular semi-open capsule manner, radioactive particles are easy to fall off and shift from the opening of the placed capsule, thereby causing serious unexpected calculations; 3) the manual manufacturing mode and process cannot realize standardized and large-scale batch production.

Therefore, there is a need in the art for an innovative design of internal radiation cradle to address the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a conformal adjustable internal radiation membranous stent for malignant tumors of organs in human body cavities and ducts, which can be customized individually, can be shaped like a shape of a tumor, can load/unload radioactive particles, is not easy to fall off, is convenient for standardized production, and is effectively used for relieving obstruction and treating the tumor by accurate internal radiation.

In order to achieve the purpose, the invention adopts the following technical scheme:

a conformable and adjustable endoradioactive membranous stent for use in human luminal visceral organ malignancies, said stent comprising:

the membrane body is prepared from an elastic high polymer material, at least one end of the membrane body is provided with a support hook, the outer wall of the membrane body is integrally and convexly provided with closed accommodating nests distributed in an array manner, and the accommodating nests are used for accommodating radioactive particles.

Further, a preferred technical solution provided by the present invention is:

the accommodating nest is in a strip shape, and the inner cavity of the accommodating nest is in a cuboid or cylinder shape; the accommodating nests are distributed in parallel with the axial direction of the membrane body, or the accommodating nests are distributed in a spiral shape obliquely surrounding the membrane body.

Further, a preferred technical solution provided by the present invention is:

the membranous stent comprises a nickel-titanium memory alloy framework, and the membranous body integrally coats the framework during preparation and molding.

Further, a preferred technical solution provided by the present invention is:

the framework is formed by assembling a plurality of axial wires and radial rings; or the framework is a spiral structure woven by nickel-titanium memory alloy wires; or the framework is a telescopic structure formed by weaving nickel-titanium memory alloy wires.

Further, a preferred technical solution provided by the present invention is:

the inner side of the membranous body is provided with a bare stent made of nickel-titanium memory alloy.

Further, a preferred technical solution provided by the present invention is:

the membranous body has a smooth interior surface.

Further, a preferred technical solution provided by the present invention is:

the port of the film covering body is gradually expanded towards the outside and is in a bell mouth shape, a dumbbell shape or a Y shape.

Further, a preferred technical solution provided by the present invention is:

the stent hook member comprises a hook wire or a hook hole.

Further, a preferred technical solution provided by the present invention is:

the high polymer material is at least one of latex, polytetrafluoroethylene, silica gel and polyurethane; or the high polymer material is a composite high polymer material for combined application.

Further, a preferred technical solution provided by the present invention is:

the puncture needle comprises a puncture needle body, an inner core push rod and an elastic piece;

the puncture needle body is tubular, the tail end of the puncture needle body is provided with a filling groove for placing radioactive particles, and the top end of the filling groove is a conical needle point;

the inner core push rod penetrates into the pricking pin body from the head end of the pricking pin body, the end part of the inner core push rod is pushed and resisted to the filling groove, the other end of the inner core push rod is provided with a thimble component, and the thimble component is positioned on the outer side of the head end of the pricking pin body; a fixed snap ring is arranged at a position of a preset distance, exposed out of the puncture needle body, of the inner core push rod, and is used for limiting the distance of the inner core push rod for pushing forwards, wherein the distance is just the distance of pushing the radioactive particles out of the filling groove;

the elastic piece is positioned in the puncture needle body, one end of the elastic piece is connected with the puncture needle body, and the other end of the elastic piece is connected with the inner core push rod, so that the elastic piece has the tendency of recovering the original shape after the inner core push rod is pushed to push out the radioactive particles positioned in the filling groove.

Compared with the prior art, the technical scheme at least has the following beneficial effects:

the conformal and adjustable internal radioactive membranous stent for malignant tumor of human body cavity organ provided by the invention can be customized individually, and radioactive particles can be arranged in a conformal manner according to the three-dimensional form of tumor, so that the tumor can be treated accurately and the damage caused by wrong irradiation is avoided.

Furthermore, the conformal adjustable internal radioactive membranous stent for the malignant tumor of the human body cavity viscera can be taken out in the using process, and the particles are accurately filled again for recycling according to the dynamic change of the local tumor after treatment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a partial schematic structural view of a first embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a first embodiment of the present invention;

FIG. 4 is a schematic view of a radioactive particle-loaded structure according to a first embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a radioactive particle-packed bed according to a first embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 7 is a schematic cross-sectional structure of a second embodiment of the present invention;

FIG. 8 is a schematic view of a radioactive particle-loaded structure according to a second embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of a radioactive particle-loaded structure according to a second embodiment of the present invention;

FIG. 10 is a schematic view of the construction of the magnetic lancet of the present invention;

FIG. 11 is a schematic view of the end structure of the lancet body of the present invention after being loaded with radioactive particles;

FIG. 12 is a schematic view showing the state of use of the magnetic puncture needle of the present invention;

FIG. 13 is a schematic flow diagram of a personalized precise three-dimensional conformal internal irradiation process for treating tumors;

FIG. 14 is a schematic flow diagram corresponding to a cross-section of a conformally loaded radioactive particle for individualized custom membrane stent for three-dimensional reconstruction of a tumor;

fig. 15 is a schematic flow diagram of the correspondence of longitudinal sections of a conformal loaded radioactive particle for individualized custom membrane stent for tumor three-dimensional reconstruction.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer", "top", "end", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 5, there is shown a main structure of a conformable and adjustable inner radioactive membranous stent 10 for visceral tumor of human body cavity according to a first embodiment of the present invention. The conformal and adjustable inner radiation membranous stent 10 for the visceral organ tumor of the human body cavity, provided by the embodiment of the invention, is a simple membranous stent, and comprises a membranous body 11 prepared from an elastic high polymer material, wherein at least one end of the membranous body 11 is provided with a stent hook part 12, closed accommodating nests 14 which are distributed in an array mode are integrally and convexly arranged around the outer wall of the membranous body 11, and the accommodating nests 14 are used for accommodating radioactive particles 15.

The film body 11 and the accommodating nest 14 may be integrally formed by using a mold, or may be implemented by using other processes, such as a 3D printing technology. The elastic polymer material used for preparing the membrane body 11 and the accommodating nest 14 may be one of latex, Polytetrafluoroethylene (PTFE), silica gel, polyurethane, or a composite polymer material used in combination. The membranous layers of the membranous body 11 and the accommodating nest 14 can be made of high molecular materials in an integrated or layered mode, so that the membranous layers have high toughness and plasticity, and the convex accommodating nest 14 also has high elasticity. The film-like body 11 has a smooth inner surface. The accommodating nest 14 is elongated and extends along the length direction of the film body 11. The inner cavity of the accommodating nest 14 can be a cuboid or a cylinder. The size of the housing nest is adapted to the commercial radioactive particles, for example, slightly larger than the radioactive 125 iodine particles (4.5 mm long, 0.8mm diameter cylinders). It should be noted that, although the accommodating nests 14 are distributed parallel to the axial direction of the film body 11 in the embodiment, the accommodating nests 14 may be distributed in other forms, for example, the accommodating nests 14 are distributed spirally around the film body 11.

The stent hook member 12 is used to remove or move the stent 10 at the time of endoscopic surgery again, for example, the stent hook member 12 may be a hook wire 121 or a hook hole 122, and the hook wire 121 or the hook hole 122 is directly hooked by a hook clamp under the endoscope at the time of surgery to remove or move the stent 10. As shown in fig. 1, both ends of the film body 11 may be provided with hook holes 122, and one end thereof is provided with a hook wire 121. The number of hook holes 122 at each end may be 2-4 or more, and it should be noted that the number of hook holes 122 and hook threads 121 may be set according to the size of the film-like body 11 or the actual need, and is not limited herein. Only the hook hole 122 may be provided on the bracket 10, or only the hook wire 121 may be provided on the bracket 10, that is, one of the hook wire 121 and the hook hole 122 may be provided on the bracket 10.

In this embodiment, the length of the cavity of the accommodating nest 14 is 5.0-5.5mm, and the height thereof is 1.0-1.2 mm. It should be noted that the respective density and size of the housing nest 14 can be individually tailored according to the treatment needs (different tumor volumes, different radioactive particles); the overall height of the housing nest 14 may vary according to the tumor at different locations, thereby increasing the frictional resistance between the stent 10 and the local tissue and preventing the stent 10 from being displaced. In addition, the overall shape of the membrane body 11 may be tubular, or one or both side ports of the membrane body 11 may be flared outward to form a bell shape or the membrane body 11 may be dumbbell-shaped to further prevent the stent 10 from being displaced. It should be understood that the membranous body 11 may also have other shapes, such as a Y-shaped stent that fits the junction of the left and right bronchi, to provide more optimal organ suitability.

Referring to fig. 6 to 9, it is a main structure of a conformal adjustable inner radioactive membranous stent 10 for malignant tumor of human body cavity viscera according to a second embodiment of the present invention. The main differences between the conformal and adjustable inner radioactive membranous stent 10 for the visceral organ tumor of the human body cavity and the first embodiment are as follows: the membranous stent 10 also comprises a skeleton 16 of the nickel titanium memory alloy, and the membranous body 11 covers the skeleton 16 when being prepared and molded. The armature 16 is assembled from a plurality of axial wires 161 and radial rings 162. The axial filaments 161 and the radial rings 162 are enclosed within the membranous body, the axial filaments 161 extending axially along the membranous body 11, and the radial rings 162 surrounding the membranous body 11. The frame 16 may also be a helical structure woven from nitinol wires, or the frame 16 may be a retractable structure woven from nitinol wires, similar to a conventional bare metal stent.

In addition, the framework 16 can also be integrally prepared by weaving a nickel-titanium memory alloy wire 17 into a frame, or can be an existing commercial self-expanding metal bare stent, namely, the stent 10 can be formed by sheathing the membrane body 11 on the metal bare stent by using the elasticity of the membrane body.

Referring to fig. 10 to 12, there is provided a main structure of a magnetic puncture needle 20 according to an embodiment of the present invention. The conformal and adjustable inner radioactive membranous stent 10 for malignant tumor of human cavity and channel viscera can also comprise a puncture needle 20. The puncture needle 20 includes a puncture needle body 21, an inner core plunger 22, and an elastic member 23. The puncture needle body 21 is tubular, and a loading groove 24 for placing the radioactive seeds 15 is provided at the end thereof, and the top of the loading groove 24 is a tapered needle tip 25. The main body of the inner core push rod 22 is positioned in the lumen of the puncture needle body 21 and pushes and resists the end part thereof to the filling groove 24, the other end of the inner core push rod 22 is provided with an ejector pin component 26, and the ejector pin component 26 is positioned outside the puncture needle body 21. A fixing snap ring 27 is installed at a predetermined distance position where the plunger rod 22 is exposed out of the puncture needle body 21, so as to limit the forward pushing distance of the plunger rod 22, which is just the distance to push the radioactive seeds 15 out of the loading slot 24. That is, when the core plunger 22 pushes the radioactive seeds 15 out of the loading groove 24, the fixing clip 27 abuts against the edge of the puncture needle body 21 to achieve the limit effect. The fixing clip 27 may be integrally formed with the core pusher 22 or may be a socket. Optionally, the filling slot 24 and the tapered needle tip 25 are magnetic.

The elastic element 23 is located in the lancet body 21, and one end of the elastic element is connected with the lancet body 21, and the other end of the elastic element is connected with the plunger push rod 22, so that the elastic element has a tendency of recovering after the plunger push rod 22 is pushed to push out the radioactive particles 15 located in the loading slot 24. In this embodiment, the elastic member 23 is a spring.

The puncture needle 20 is used for installing or removing the radioactive seeds 15 in the accommodating nest 14. The puncture needle 20 punctures the longitudinal side wall of the containing nest 14 by utilizing the triangular conical needle point 25, pushes the thimble component 26 to send the radioactive particles 15 into the nest for fixation, and when the puncture needle is pulled out, the needle eye naturally retracts due to the elasticity of the nest wall, thereby recovering the tightness. When the efficacy of the radioactive particles is attenuated, the radioactive particles 15 are taken out and replaced by the magnetic puncture needle 20 in the same method, so that when the tumor progresses or shrinks, the covered stent 10 is taken out by an endoscope, and the quantity of the radioactive particles 15 is supplemented or reduced or the radioactive particles 15 are replaced according to dynamic change of a new three-dimensional reconstruction result of the tumor after a certain time of treatment, or the arrangement of the radioactive particles is readjusted according to needs.

Referring to fig. 13, a clinical procedure for treating malignant tumors for personalized, precise three-dimensional conformal internal irradiation. The method mainly comprises the following steps: step 1, reconstructing a hollow organ tumor in three dimensions through an endoscope and image data; step 2, customizing an internal radioactive membranous scaffold in a personalized way according to the structural relationship between the hollow organ tumor and surrounding tissues; step 3, filling radioactive particles in a form-fitting manner; step 4, placing an inner radioactive membrane bracket by an endoscope (or under image guidance); step 5, periodically rechecking and adjusting the configuration of the bracket and the radioactive particles in time; and 6, realizing dynamic accurate treatment of the tumor.

Referring to fig. 14, fig. 14 is a flow chart of cross-sectional mapping for personalized customization of an endoradioactive stent for three-dimensional reconstruction of a tumor, conformal loading with radioactive particles, for targeting endoirradiation. As shown in fig. 14, the left side (a) shows the structural relationship between the hollow organ tumor and the surrounding tissues, and the right side (b) shows the radioactive particles placed in the containing nest corresponding to the tumor position, but no tumor position exists, and no filling is performed in the containing nest. Fig. 15 is a flow chart of profile mapping for individually customizing an endoradioactive stent for tumor three-dimensional reconstruction, and conformally loading radioactive particles for precise endoirradiation.

Referring to fig. 15, fig. 15 is a flow chart of correspondence of longitudinal sections for individually customizing an inner radioactive membrane stent and conformally filling radioactive particles to perform quasi-inner irradiation for tumor three-dimensional reconstruction. As shown in fig. 15, the left side (c) shows the longitudinal height of different positions (A, B, C) of the hollow organ tumor, and the right side (d) shows the corresponding accommodating nest of the inner radioactive stent for filling the radioactive stent. In addition, the device can customize different storage nest densities, support pipe diameters and specifications of radioactive particles according to the characteristics of tumor volume, texture, pathology and the like, and realizes the radiotherapy through conformal filling of the radioactive particles. The radioactive particles are mainly iodine 125 in the market, but not limited to the iodine 125, and can also be other radioactive particles currently or available in the market in future for radiotherapy, such as iridium-192, ytterbium-169, palladium-103, cesium-131 and the like.

In conclusion, the conformal and adjustable inner radioactive membranous stent for the visceral organ tumor of the human body cavity can be customized individually, can be conformal according to the tumor, can load/unload radioactive particles, dynamically adjust the particle arrangement, is not easy to shift and fall off, is convenient for standardization and industrialized production, and is effectively used for relieving obstruction and treating malignant tumor by precise inner irradiation. The invention can be used by a single person for many times, has simple and convenient operation, high safety and high cost performance.

The conformal and adjustable inner radioactive membranous stent for the human body cavity organ tumor can be used for treating esophageal cancer and also can be used for treating malignant tumors of other human body cavity organs, such as primary or metastatic malignant tumor pressure obstruction of large blood vessels such as trachea, bronchus, biliary tract, gastroduodenal, colorectal, ureter, aorta and inferior vena cava.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.