Patent Description:
Digestive tract-gallbladder anastomosis is that under an endoscope, a thermal implantation device punctures into the gallbladder at a target location through a gastric wall or a duodenal wall, a distal end of a fully covered double mushroom head stent is placed in the gallbladder, and a proximal end of mushroom heads is placed in the stomach or duodenum, so as to open up a passage between the digestive tract and the gallbladder, in other words, to recreate a new path between the digestive tract and the gallbladder. Afterwards, through a gastroscope and the newly built passage, stones in the gallbladder are removed by a stone removal basket, so as to achieve endoscopic gallbladder preservation and stone removal surgery, which provides a new treatment problem for patients with a gallbladder disease who are not suitable for surgery, and can also provide patients having good gallbladder function with a treatment method that can preserve the gallbladder function, improving the long-term quality of life of the patients. The stomach-pancreatic pseudocyst stent anastomosis is that under an endoscope, a large-diameter fully covered double mushroom head stent punctures into a pancreatic pseudocyst of a patient through the stomach, and is placed therein, so as to achieve the anastomosis between the stomach and the pancreatic pseudocyst, thereby fully draining the hydrops and sphacelus in the pancreatic pseudocyst.

In the Duodenum-bile duct anastomosis, a traditional ERCP surgery is inserting a guide wire or other instrument into the duodenal papilla retrogradely from the duodenum through an ERCP endoscopy, to reach the common bile duct, and performing stones removal and biopsy treatment on the common bile duct, etc. For a patient into whose body the guide wire is difficult to insert, percutaneous puncture or surgical operation is usually required, which may lower the patient's quality of life or bring a greater trauma.

Regarding gastrointestinal anastomosis, a patient who has been vomiting because a passage of food in the stomach into the intestine is blocked due to tumor invasion, is either subjected to laparotomy to establish a new gastrointestinal passage, or can only rely on intravenous nutrition for support, in the past. For those patients who are old or whose physical conditions are no longer suitable for laparotomy, their quality of life is extremely low, which also bring a heavy burden to their families. Gastrointestinal anastomosis is that under an endoscopic ultrasonography scope (EUS), a large diameter fully covered double mushroom head stent punctures into a nearness small bowel through the stomach, and is placed therein, to open up a passage between the stomach and the small intestine, in other words, to recreate a new path between the stomach and the small intestine, thereby solving influence of duodenal obstruction on the life of patients.

In the past, such "bypass" construction requires laparotomy under general anesthesia, which is more traumatic. A minimally invasive surgery under an endoscopy has less trauma, short operation time, small pain and quick recovery, which fully shows the advantages of endoscopic minimally invasive surgery. In recent years, with the continuous development and upgrading of endoscopic technology and various instrument accessories, the endoscopy plays an increasingly important role in the diagnosis and treatment of various diseases of the digestive system, especially the continuous innovation of the minimally invasive surgery under endoscopy provides a new minimally invasive treatment method for many patients with gastrointestinal and biliary and pancreatic diseases who are unable or unwilling to undergo a surgery. Currently, in the above four traditional surgeries, the stent is usually a metal double mushroom head stent with a diameter of ϕ10mm-ϕ16mm, and an outer diameter of a matching thermal implantation device is ϕ3. <NUM> (<NUM>. 8Fr), and a traditional ultrasound endoscopic channel is ϕ3. <NUM>, because the gap is too small, a traditional charged implantation device cannot move freely back and forth in the endoscopic channel, which is a main reason why the above surgeries are difficult to perform. At the same time, the outer diameter of an ultrasound endoscope is ϕ14mm, which is <NUM> larger than the outer diameter of a traditional gastroscope (ϕ10mm), thus it is more inconvenient to operate and has relatively fewer places to reach.

Therefore, in order to carry out a stomach gallbladder anastomosis, a gastrointestinal anastomosis, and a human body natural orifice transluminalendoscopic surgery (NOTES), etc., through gastroscope, it is necessary to design a smaller charged implantation device, and simplify release step of the stent through a gastroscopic channel, so as to release the stent more safely and quickly.

<CIT> discloses a stent delivery system comprising: a connector portion connected to an external current source; an electrocautery tip connected to the connector portion by a wire; and a delivery portion, one side of which is linked with the electrocautery tip, the other side of which is linked with the connector portion, and in which the wire is arranged to connect the electrocautery tip and the connector portion, wherein a stent space portion is formed adjacent to the electrocautery tip inside the delivery portion such that a stent is arranged therein.

<CIT> discloses an integral stent implantation device, comprising a front handle and a rear handle, a front end of the front hand being provided with an outer tube which is freely connected with a cutting head at its top end, a middle tube and a support being provided inside the outer tube; and also discloses a stainless steel tube.

<NPL>) discloses that endoscopic ultrasonography (EUS)-guided translumenal drainage of pancreatic fluid collections and obstructed bile and pancreatic ducts has been widely practiced for over a decade now, using conventional tubular plastic and metal stents. Their application for transmural drainage has been "off label" and limited by the lack of lumen-to-lumen anchorage that can lead to leakage, perforation, and stent migration. In addition, the length of a tubular stent exceeding the anatomical requirement of a translumenal anastomosis can lead to tissue trauma at the stent ends.

The present invention is defined in the appended set of claims. The present invention provides a brand-new method to solve bile duct obstruction, and meanwhile the method saves surgery time, saves surgical instruments, reduces the difficulty of surgery, providing possibility for more doctors to carry out this surgery. A thermopuncture stent implantation device according to the present invention eliminates an inner tube and a conductive wire of a traditional implantation device, and replaces them with a conductive part, which achieves the purpose of supporting the stent and meanwhile has the function of transmitting high-frequency electricity. An outer diameter of the existing thermopuncture implantation device can be reduced from <NUM>-<NUM> (<NUM>. 8Fr) to <NUM> (<NUM>. 5Fr), so that the thermopuncture implantation device can pass through a traditional gastroscopic channel of ϕ3. <NUM>, providing possibility for doctors to perform more advanced digestive tract-gallbladder anastomosis, duodenum-bile duct anastomosis, stomach-pancreatic pseudocyst stent anastomosis, gastrointestinal anastomosis, NOTES surgery and so on.

In the following, one end of a conductive head is defined as a distal end, and an end of the implantation device connected to an external power source is defined as a proximal end.

The thermopuncture stent implantation device has a proximal end and a distal end, a distal end of a front handle is provided with an outer tube, the outer tube extends from the proximal end to the distal end, an outer diameter of the distal end of an outer tube is less than or equal to <NUM>, an insulating middle tube is provided in the outer tube, and extends from the proximal end to the distal end, a conductive part is provided in the insulating middle tube, the insulating middle tube and the conductive part extend from the proximal end to the distal end, a terminal of the proximal end of the conductive part can be connected to an external power source; a boosting tube is provided between the proximal end of the outer tube and the insulating middle tube, the distal end of the boosting tube and the proximal end of the insulating middle tube are connected with each other; the distal end of the conductive part is provided with an insulating part, a conductive head is distributed on the insulating part, and the conductive head is connected with the conductive part to achieve a conductive function, and the stent, after being compressed, is located in a space between the distal end of the conductive part and the outer tube, and the front handle is connected to the proximal end of the outer tube, and moved backwards along the boosting tube, to drive the outer tube to move backwards to release the stent. The conductive part not only conducts electricity, but also supports the stent. Compared with a traditional stent implantation device, the conductive part reduces an inner tube and a guide wire, and at the same time, it can conduct electricity, cut tissues, and release the stent after reaching a lesion site.

There is a certain gap between the insulating part and the conductive part, the conductive head is provided at a terminal of the distal end of the implantation device, one end of the conductive head can extend from the distal end to the proximal end to enter the gap between the insulating part and the conductive part, and thus be connected with the conductive part to achieve a conductive function, the other end of the conductive head is covered on an outer surface of the insulating part.

Preferably, the conductive part is a hollow conductive part.

More preferably, the terminal of the proximal end of the conductive part is connected with a Luer connector to achieve liquid injection.

Preferably, the conductive part is a conductive wire.

Preferably, the conductive part is a nickel-titanium wire.

Preferably, the conductive part is a metal material. More preferably, the conductive part is a stainless steel material.

Preferably, the material of the insulating part is ceramic.

The outer tube includes a proximal outer tube and a distal outer tube, the proximal outer tube and the distal outer tube are connected in a taper. The boosting tube extends towards the proximal end and is connected with a rear handle, and a positioning part is provided between the front handle and the rear handle. An outer surface of the conductive part at a certain distance from the conductive head is covered with a resistance part. The conductive head comprises two or four conductive wires, and the two or four conductive wires are evenly distributed within a groove on an outer surface of the insulating part. The other end of the conductive head close to an outer side is completely covered on the outer surface of the insulating part, and when cutting with the conductive head, a cut surface of a wound is a circular surface. An outer surface of the conductive part can be covered with a riveting tube, an end of the conductive head can extend from the distal end to the proximal end to enter the gap between the insulating part and the conductive part, and achieve the conductive function by connection of the riveting tube and the conductive part.

The outer diameter of the thermopuncture stent according to the present invention is smaller than the outer diameter of the stent implantation device in the prior art, and provides a new minimally invasive treatment method for many patients with gastrointestinal and biliary and pancreatic diseases who are unable or unwilling to undergo a surgery.

The thermopuncture implantation device (diameter of <NUM>) according to the present invention can accommodate a double mushroom head metal stent that is braided by a nickel-titanium wire and has a diameter of ϕ10mm-ϕ16mm, and can enter into stomach, duodenum and other organs through a traditional gastroscopic channel of <NUM>; the implantation device is electrified to puncture a stomach wall or an intestinal wall, and enter into the small intestine, gallbladder, pancreatic cyst, common bile duct and other structures, to release the stent precisely, and it can anastomose the above tissues with the stomach wall or the intestinal wall respectively, to achieve drainage, gallbladder protection, stone removal, bypass opening and other functions.

It can be inferred from the above that in the case where the traditional ultrasound endoscopic channel is ϕ3. <NUM>, when the outer diameter of the implantation device of the present disclosure is increased from <NUM> (<NUM>. 5Fr) to <NUM>-<NUM> (<NUM>. 8Fr), then a cross-sectional area of the implantation device will be increased by <NUM>-<NUM>%, as calculated by the formula (π*R1*R1)/(π*R2*R2), where R1=<NUM>/<NUM> or <NUM>/<NUM>, and R2=<NUM>/<NUM>, so that a double mushroom head metal stent that is braided by a nickel-titanium wire and has a larger diameter (e.g., ϕ18mm) than diameter ϕ16mm can be fitted into the thermopuncture implantation device of the present disclosure. For example, When the diameter of the stent is <NUM>, (π*R3*R3)/(π*R4*R4)=<NUM>% where R3=<NUM>/<NUM>, R4=<NUM>/<NUM>, that is, a cross-sectional area of the stent with a diameter of <NUM> is increased by <NUM>% compared with the stent with a diameter of <NUM>. Since the increase of the cross-sectional area of the implantation device is <NUM>-<NUM>%, the stent with a cross-sectional area increase of <NUM>% can be placed into the implantation device.

<NUM>-conductive head, <NUM>-insulating part, <NUM>-conductive part, <NUM>-outer tube, <NUM>-proximal outer tube, <NUM>-distal outer tube, <NUM>-boosting tube, <NUM>-insulating middle tube, <NUM>-safety buckle, <NUM>-outer tube locking cap, <NUM>-safety lock, <NUM>-positioning part, <NUM>-resistance part, <NUM>-riveting tube, <NUM>-front handle, <NUM>-rear handle, <NUM>-conductive base, <NUM>-conductive plug, <NUM>-Luer connector, <NUM>-distal tissue, <NUM>-proximal tissue, and <NUM>-double mushroom head stent.

In order to make the purpose, technical solutions and advantages of the present invention more explicit, the present invention will be further illustrated in detail in combination with accompanying drawings and embodiments hereinafter. It should be understood that specific embodiments described herein are only used for explaining the present invention, instead of limiting the present invention.

In the following, an end of a conductive head is defined as a distal end, and an end of a stent implantation device connected to an external power source is defined as a proximal end.

As shown in <FIG>, the stent implantation device according to the present invention has the proximal end and the distal end, and the stent implantation device includes an outer tube <NUM>, a boosting tube <NUM>, an insulating middle tube <NUM>, an outer tube locking cap <NUM>, a safety lock <NUM>, a positioning part <NUM>, a resistance part <NUM>, a front handle <NUM>, a rear handle <NUM>, a conductive base <NUM>, a conductive plug <NUM>, a Luer connector <NUM>, a conductive head <NUM>, an insulating part <NUM> and a conductive part <NUM>.

The outer tube <NUM> includes a proximal outer tube <NUM> and a distal outer tube <NUM>. The proximal outer tube <NUM> is provided at the distal end of the front handle <NUM>, and can be fixed with the front handle <NUM> through the outer tube locking cap <NUM>, the safety lock <NUM> is provided at the proximal end of the front handle <NUM>, and the safety lock <NUM> has threads, which can be matched with threads on the proximal end of the front handle <NUM>, and installed thereon. The insulating middle tube <NUM> and a stent are arranged within the outer tube <NUM>, the proximal end of the stent abuts against the distal end of the insulating middle tube <NUM>, and the distal end of the stent is close to the insulating part <NUM>, leaving a certain gap; the proximal outer tube <NUM> and the distal outer tube <NUM> are connected in a taper. The boosting tube <NUM> is provided between the proximal outer tube <NUM> and the insulating middle tube <NUM>, the boosting tube <NUM> can be made of a stainless steel material, the distal end of the boosting tube <NUM> and the proximal end of the insulating middle tube <NUM> are connected with each other; such taper design of the proximal outer tube <NUM> and the distal outer tube <NUM> makes the size of the distal outer tube <NUM> entering a lesion site less than or equal to <NUM>, and the boosting tube <NUM> is provided between the proximal outer tube <NUM> and the insulating middle tube <NUM>, to provide a force required to release the stent. The insulating middle tube <NUM> can be made from a special polymer material polyether ether ketone, has high-performance electrical insulating property and thus can isolate the high-frequency electricity of the conductive part <NUM> from the boosting tube <NUM>, so that the operator can completely avoid the risk of electric shock. The boosting tube <NUM> extends towards the proximal end and is connected with the rear handle <NUM>, the conductive base <NUM> is provided at the proximal end of the rear handle <NUM>, there is the conductive plug <NUM> within the conductive base <NUM>, and the conductive plug <NUM> can be connected to the conductive head <NUM> through the conductive part <NUM>, so as to achieve electrifying.

The positioning part <NUM> may be further provided between the front handle <NUM> and the rear handle <NUM>, the positioning part <NUM> can be designed as a structure of a safety buckle <NUM>. As shown in FIG. 11A and FIG. 11B, the positioning part <NUM> is the structure of the safety buckle <NUM>, and when releasing the stent, the safety lock <NUM> is first loosed to move backwards the front handle <NUM> towards the proximal end, so as to touch the safety buckle <NUM>, the distal end of the stent is released within the distal tissue <NUM>, the stent implantation device is withdrawn, to pull the stent to close to the proximal tissue, and remove the safety buckle <NUM>. The front handle <NUM> is continued to be withdrawn towards the proximal end, and the stent is continued to be released in the proximal tissue <NUM>, so as to achieve an anastomosing connection of the distal tissue <NUM> with the proximal tissue <NUM> by the stent.

An outer surface of the conductive part <NUM> at a certain distance from the conductive head <NUM> can be covered with the resistance part <NUM>. The resistance part <NUM> can provide a certain resistance for the stent when the stent is released, so that the stent is not easy to slip to the outside of the lesion.

The distal end of the stent implantation device further includes the conductive head <NUM>, the insulating part <NUM> and the conductive part <NUM>. When the conductive plug <NUM> is connected to an external high-frequency power source, the high-frequency power source is transmitted to the conductive head <NUM> through the conductive part <NUM>, so that the stent implantation device has electrical cutting function, to perform a high-frequency cutting on a human tissue. The conductive part <NUM> can be any kind of medical metal material, such as nickel titanium material or stainless steel material; the conductive part <NUM> is arranged within the insulating middle tube <NUM>, extends from the distal end to the proximal end, and is connected to the conductive plug <NUM> through the rear handle <NUM>, the size of the outer diameter of the conductive part <NUM> can be designed according to actual needs, the present invention can reduce an outer diameter of an implantation part of an existing thermopuncture stent implantation device from <NUM>-<NUM> (<NUM>. 8Fr) to below <NUM> (9Fr) through a design of the conductive part <NUM>, and preferably, it can be reduced to <NUM> (<NUM>. In addition, the conductive part <NUM> can be a hollow conductive part, so as to achieve the function of liquid injection and development, and the conductive part <NUM> can also be designed as a conductive wire. When the conductive part <NUM> is designed as a hollow conductive part, a cross-sectional diagram taken along B-B position in <FIG> is shown in <FIG>, showing a position relation of the conductive part <NUM>, the insulating middle tube <NUM> and the distal outer tube <NUM>, and a cross-sectional diagram taken along C-C position in <FIG> is shown in <FIG>, showing a position relation of the conductive part <NUM>, the insulating middle tube <NUM> and the proximal outer tube <NUM>. <FIG> is a cross-sectional view of a proximal tail structure of a stent implantation device corresponding to <FIG> and <FIG>, <FIG> is a partial enlarged view of <FIG>, there is the conductive plug <NUM> within the conductive base <NUM>, and the conductive plug <NUM> can be connected to the conductive head <NUM> through the conductive part <NUM>, so as to achieve electrifying. The proximal end of the conductive part <NUM> communicates with the Luer connector <NUM>, a doctor can connect the Luer connector <NUM> with a standard injector, and can inject a liquid or a contrast agent into a hollow tube cavity, the liquid or the contrast agent passes through the tube cavity of the conductive part <NUM> to reach the conductive head <NUM> at the distal end of the implantation device, and then is injected into a patient's lesion site, the contrast agent is developed under X-ray, marking a target location of the lesion for the doctor, and the doctor can prepare for the next step of releasing the stent.

When the conductive part <NUM> is designed as a conductive wire, the conductive wire can adopt different sizes according to requirements. A cross-sectional diagram taken along B-B position in <FIG> is shown in <FIG>, showing a position relation of the conductive part <NUM>, the insulating middle tube <NUM> and the distal outer tube <NUM>; a cross-sectional diagram taken along C-C position in <FIG> is shown in <FIG>, showing a positional relation of the conductive part <NUM>, the insulating middle tube <NUM> and the proximal outer tube <NUM>. <FIG> is a structural cross-sectional view of a proximal tail of a stent implantation device corresponding to <FIG>, there is the conductive plug <NUM> within the conductive base <NUM>, and the conductive plug <NUM> can be connected to the conductive head <NUM> through the conductive part <NUM>, so as to achieve electrifying.

The insulating part <NUM> is located at the distal end of the conductive part <NUM>, there is a certain gap between the insulating part <NUM> and the conductive part <NUM>, one end of the conductive head <NUM> can extend from the distal end to the proximal end, to enter the gap between the insulating part <NUM> and the conductive part <NUM>, so as to be connected with the conductive part <NUM> to achieve a conductive function, and the other end of the conductive head <NUM> is covered on an outer surface of the insulating part <NUM>. High-frequency electricity is transmitted to the conductive head <NUM> at the distal end of the stent implantation device through the conductive part <NUM>, so that the stent implantation device has an electrical cutting function, and can perform a high-frequency cutting and puncture on a human tissue. The insulating part <NUM> can be made of, such as, a ceramic material, which can prevent tissues from sticking, and make cutting more convenient.

The conductive part <NUM> according to the present invention replaces an inner tube and a conductive wire of a traditional stent implantation device, having a conductive function, and replacing an outer diameter ϕ1. <NUM> of an original inner tube and an outer diameter ϕ0. <NUM> of the original conductive wire with a diameter less than ϕ0. <NUM> of the conductive part <NUM>, with the total diameter being reduced by a space of ϕ1mm (a space of 3Fr), so that a conventional covered gastrointestinal stent (<NUM>-<NUM>) can be installed; and since ϕ3. <NUM> (<NUM>. 8Fr) of the outer diameter of an original traditional thermal implantation device is reduced to <NUM> (<NUM>. 5Fr), an electric implantation device can smoothly pass through a gastroscopic channel of ϕ3.

The structures of the conductive head <NUM>, the insulating part <NUM> and the conductive part <NUM> at the distal end of the stent implantation device according to the present invention are as shown in <FIG>, the conductive head <NUM> can comprises two or four conductive wires, one end of the conductive head <NUM> can extend from the distal end to the proximal end, to enter the gap between the insulating part <NUM> and the conductive part <NUM>, and thus be connected with the conductive part <NUM> to achieve a conductive function; the other end of the conductive head <NUM> is covered on the outer surface of the insulating part <NUM>. At the distal end, the conductive head <NUM> can be evenly distributed within grooves on an outer surface of the insulating part <NUM> by the two or four conductive wires, so as to achieve conductive and cutting functions. Within grooves on the outer surface of the insulating part <NUM>, adjacent conductive wires are spaced apart in the same angle, and radially distributed on the outer surface of the insulating part <NUM>.

As shown in <FIG>, one end of the conductive head <NUM> can extend from the distal end to the proximal end, to enter the gap between the insulating part <NUM> and the conductive part <NUM>, and thus be connected with the conductive part <NUM> to achieve a conductive function; the other end of the conductive head <NUM> is fully covered on the outer surface of the insulating part <NUM>. In this case, when cutting with the conductive head <NUM>, a cut surface is a circular surface, instead of a straight incision, thus it is easier to stop bleeding when using a hemostatic clip to stop bleeding, which is beneficial to wound healing.

As shown in <FIG>, the outer surface of the conductive part <NUM> can be covered with a riveting tube <NUM>, one end of the conductive head <NUM> can extend from the distal end to the proximal end to enter the gap between the insulating part <NUM> and the conductive part <NUM>, and can be connected with the conductive part <NUM> through the riveting tube <NUM> to achieve a conductive function. The riveting tube <NUM> can be made of stainless steel, and can connect the conductive part <NUM> with the insulating part <NUM>. As shown in <FIG>, the other end of the conductive head <NUM> can be fully covered on the outer surface of the insulating part <NUM>, and in this case, when cutting with the conductive head <NUM>, the cut surface is a circular surface, instead of a straight incision, which is beneficial to wound healing.

As shown in <FIG>, the other end of the conductive head <NUM> can also be distributed within a groove on the surface of the insulating part <NUM> in the form of one conductive wire, and is looped around a terminal of the distal end of the stent implantation device to form a "<IMG>" bevel conductive incision, and at this time, when cutting a tissue, the conductive wire looped and the conductive wire distributed within the groove are utilized. If there is no riveting tube <NUM>, one end of the conductive head <NUM> is directly connected to the conductive part <NUM>, and the other end of the conductive head <NUM> is distributed on the periphery of the insulating part <NUM>, which can also achieve the conductive function.

When the stent implantation device according to the present invention is used, after the conductive plug <NUM> is connected to an external high-frequency power source, the high-frequency power source is transmitted to the conductive head <NUM> through the conductive part <NUM>, so that the stent implantation device has an electrical cutting function, and can cut the diseased distal tissue <NUM>; if the conductive part <NUM> is a hollow conductive part, it is connected with an external Luer connector, so as to make the stent implantation device have a liquid injection function.

As shown in <FIG>, the double mushroom head stent <NUM> is released by the thermopuncture stent implantation device, and when the double mushroom head stent <NUM> is opened, one end of which is in the distal tissue <NUM> and the other end of which is in the proximal tissue <NUM>.

Claim 1:
An thermopuncture stent implantation device, wherein the thermopuncture stent implantation device has a proximal end and a distal end, a front handle (<NUM>), a rear handle (<NUM>), the distal end of the front handle (<NUM>) is provided with an outer tube (<NUM>), the outer tube (<NUM>) extends from the proximal end to the distal end, an outer diameter of the distal end of the outer tube (<NUM>) is less than or equal to <NUM>, an insulating middle tube (<NUM>) is provided in the outer tube (<NUM>), the insulating middle tube (<NUM>) extends from the proximal end to the distal end, a conductive part (<NUM>) is provided in the insulating middle tube (<NUM>), the conductive part (<NUM>) extends from the proximal end to the distal end, a terminal of the proximal end of the conductive part (<NUM>) can be connected to an external power source; a boosting tube (<NUM>) is provided between the proximal end of the outer tube (<NUM>) and the insulating middle tube (<NUM>), the distal end of the boosting tube (<NUM>) and the proximal end of the insulating middle tube (<NUM>) are connected with each other; the distal end of the conductive part (<NUM>) is provided with an insulating part (<NUM>), a conductive head (<NUM>) is distributed on the insulating part (<NUM>), and the conductive head (<NUM>) is connected with the conductive part (<NUM>) to achieve a conductive function, and the conductive part (<NUM>) also has a function of supporting a stent; when the stent is compressed, it is located in a space between the distal end of the conductive part (<NUM>) and the outer tube (<NUM>), the front handle (<NUM>) is connected to the proximal end of outer tube (<NUM>), and is moved backwards along the boosting tube (<NUM>), to drive the outer tube (<NUM>) to move backwards to release the stent;
the conductive part (<NUM>) is a hollow tubular conductive part, or a conductive wire; and
the boosting tube (<NUM>) extends towards the proximal end and is connected with the
rear handle (<NUM>), and a positioning part (<NUM>) is provided between the front handle (<NUM>) and the rear handle (<NUM>).