207 results about "Vascular stent" patented technology

The invention discloses a rigidity self-adaptive intravascular stent based on a three-dimensional virtual woven structure and a control method thereof. The method comprises the steps of reconstructing a preoperative tumor blood vessel three-dimensional model based on clinical iconography data, constructing a stent initialization model, starting a hexagonal knitting three-dimensional virtual algorithm, performing intravascular stent knitting modeling, realizing structural parameter optimization and adaptive stent expansion in combination with preoperative image data of a patient, and completing personalized deployment. The wire winding angle and the mesh density of each area of the stent are adjustable, the stent is adaptive to the complex intracranial aneurysm blood vessel form, accurate fitting and risk guiding are achieved, the treatment effect is improved, the postoperative complication risk is reduced, and the stent has good engineering suitability and clinical application prospects.

The invention relates to an intravascular stent auxiliary windowing method, device and system, computer equipment, a storage medium and a computer program product. The intravascular stent auxiliary windowing method comprises the following steps: constructing a first intravascular stent model based on a three-dimensional image of a blood vessel; displaying the first intravascular stent model on a first intravascular stent object in an overlapping manner; a virtual window hole contour in a preset circumferential range on the first intravascular stent model forms a mapping contour on the first intravascular stent real object, and the mapping contour is used for assisting in forming a windowing mark on the first intravascular stent real object; and rotation information is acquired, so that the first intravascular stent model and the first intravascular stent real object can synchronously rotate based on the rotation information. According to the method, the requirement for precise punching in a large range in the circumferential direction of the first intravascular stent can be met, and punching assistance in multiple positions in the circumferential direction of the first intravascular stent is achieved.

The invention provides a recoverable intravascular stent, and belongs to the technical field of interventional therapy instruments. The stent comprises a first stent body, a second stent body and an isolation component, and the outer side wall of the first stent body is used for directly supporting a blood vessel and can automatically contract in the radial direction; the second stent is coaxially arranged on the inner side of the first stent and used for supporting radial expansion of the first stent; the isolation part is arranged on the first bracket and / or the second bracket and is used for reducing the friction force between the first bracket and the second bracket; when the stent is taken out, the second stent is gradually taken out from the inner side of the first stent, the first stent automatically and radially contracts in the process of losing the support of the second stent to reduce the embedding force with the side wall of the blood vessel, and the whole stent is conveniently taken out; the intravascular stent is mainly used for solving the technical problems that in the prior art, the intravascular stent is large in resistance and not easy to take out.

The invention discloses a branch intravascular stent, and belongs to the technical field of medical instruments. Comprising a cylindrical branch covering film main body and a branch bare stent fixed on the branch covering film main body, a disc-shaped bottom covering film is in butt joint with the lower end of the branch covering film main body; the plum blossom bare stent is fixed on the lower side surface of the bottom covering film; the felt covers the upper side surface of the bottom covering film; a plurality of anchoring needles arranged around the center of the bottom covering film penetrate through the bottom covering film and the felt; the lower ends of the anchoring thorns are buckled on the plum blossom bare support, and the upper ends of the anchoring thorns exceed the felt and are provided with barbs inclining downwards. The branch intravascular stent is independent relative to the main intravascular stent, can be replaced or adjusted at any time, and has good adaptability; the detachable and adjustable felt ring has better sealing performance, so that the surgical operation difficulty can be reduced, and the surgical time can be saved; the anchoring thorns are fixedly connected with all parts of the branch intravascular stent and can be anchored into the main intravascular stent and the native blood vessel, and the problem of displacement of the subsequent branch intravascular stent is solved.

The utility model provides an intravascular stent structural member, which relates to the technical field of medical instruments and comprises a plurality of wave-shaped support rings and a plurality of connecting pieces, the wave-shaped support rings and the connecting pieces are arranged at intervals, and the connecting pieces are asymmetrically arranged at two ends of the wave-shaped support rings. The S-shaped connecting pieces with the opposite opening directions are arranged on the two sides of the wave-shaped supporting rings, so that circumferential stretching of the connecting pieces is counteracted, when the wave-shaped supporting rings expand, the adjacent wave-shaped supporting rings reversely rotate in the circumferential direction, and the situation that the intravascular stent structural piece rotates around the axis and drives a micro catheter is prevented; the problem that in the stent releasing process, the stent drives the micro-catheter to rotate, and consequently instability is caused is solved. The utility model further provides an intravascular stent comprising the intravascular stent structural member, and the intravascular stent has good flexibility and trafficability.

Devices and methods for treating a target site in a body lumen are provided. A medical device includes a stent-like structure including a plurality of scoring and non-scoring filaments interwoven with one another. Generally, the stent-like structure will have more non-scoring filaments than scoring filaments to provide greater structural support and to focus the scoring forces on only a few select areas. The stent-like structure is expanded within the target site to score the target site and to provide temporary structural support while the target site is infused with a therapeutic agent. Such therapeutic agent infusion occurs with the use of a drug eluting or drug coated balloon disposed within the stent-like structure or by occluding the target site and introducing a drug into the occluded target site to sit for a period of time.

The utility model relates to the technical field of intravascular stents, and provides an intravascular stent which comprises a stent body, the stent body comprises a plurality of sets of wave-shaped supporting rings and a plurality of connecting rods, the connecting rods are connected between every two adjacent sets of wave-shaped supporting rings, the stent body is conical, the diameter of the first end is larger than that of the second end, and the connecting rods are arranged from the first end to the second end. The length of the unfolded waveform support rings is gradually reduced, the design of the waveform support rings not only ensures the radial strength of the stent, but also enhances the flexibility and adaptability of the stent, so that the stent can be better attached to the blood vessel wall, two adjacent sets of waveform support rings are connected through a plurality of connecting rods, and the overall stability and structural integrity of the stent are ensured. The main body of the stent is conical, so that the stent can better adapt to the physiological structural characteristics of a conical blood vessel, the gradual transition of radial supporting force of the stent at different positions is ensured, the excessive compression on the blood vessel wall is reduced, the risks of stent breakage and restenosis in the stent are reduced, and the use safety performance is improved.

The invention discloses an intravascular stent bending torsion fatigue test device, and belongs to the technical field of fatigue test machinery. The intravascular stent bending torsional fatigue test device comprises a rack, the rack comprises a door-shaped support, a back plate and a base, the door-shaped support is provided with a bending load module, the bending load module comprises a first stepping motor, the output end of the first stepping motor penetrates through the back plate and is fixedly connected with an eccentric wheel through an extension shaft, and a pair of sliding blocks is additionally arranged; a sliding rail is arranged on the inner side of the door-shaped support, the sliding blocks are arranged on the sliding rail, a cantilever is connected between the pair of sliding blocks, the top of the cantilever is connected with the lower side of the top of the door-shaped support through a spring, a plurality of first loading connectors are arranged on the front face of the cantilever, and a torsion module is additionally arranged. The fatigue durability under bending-torsion dual loads can be tested, and the fatigue performance of the stent under the condition of blood vessel deformation during limb movement can be truly simulated.

The invention discloses an extravascular stent, and belongs to the technical field of intravascular stents.The extravascular stent comprises a plurality of vascular clamps, at least one vascular clamp is suitable for being clamped on the periphery of a first blood vessel, and at least one vascular clamp is suitable for being clamped on the periphery of a second blood vessel; the shaping hose is connected among the plurality of vascular clamps, and the shaping hose can be randomly bent in space and can be kept in a bent shape; when the multiple vascular clamps are clamped on the peripheries of the first blood vessel and the second blood vessel, the included angle between the first blood vessel and the second blood vessel is bent and shaped along with bending and shaping of the shaping hose. After the external vascular stent is installed, an operator can adjust the included angle between the first blood vessel and the second blood vessel in place, the shaping hose is shaped in a bent shape, and at the moment, the first blood vessel and the second blood vessel are shaped by the shaping hose in an angle-adjusted shape; therefore, angle adjustment and space shaping of the first blood vessel and the second blood vessel within the 360-degree range can be achieved.

The invention discloses an electrolytic polishing device for a magnesium alloy intravascular stent, and relates to the technical field of electrolytic polishing. A partition plate is fixed in the middle of the interior of the electrolytic tank and divides the electrolytic tank into two areas, the left area is filled with electrolyte, and the right area is filled with cleaning fluid; two guide frames are fixed to the top end face of the electrolytic bath through screws, and a mounting frame of a concave structure is arranged on the two guide frames in a sliding mode. A connecting block is fixed to the right side of the top end face of the electrolytic tank. From the aspect of polishing effect, the advantages are very prominent. In the electrolysis assembly, the coil connected with the cathode binding post enhances the cathode effect, and is connected with the cathode of the pulse power supply to effectively reduce the hydrogen evolution reaction and optimize the electrolysis process. When the sliding frame moves downwards, the stress rod interacts with the protrusion, the tooth row drives the gear to achieve reciprocating rotation of the rotating shaft and the magnesium alloy intravascular stent, meanwhile, the spiral spring drives the magnesium alloy intravascular stent to move up and down under vibration, and the contact effect between the magnesium alloy intravascular stent and electroplating liquid is greatly improved.

The application provides an absorbable vascular stent covering facilitating endothelialization and a preparation method thereof, and belongs to the technical fields of biomedical materials and vascular stent covering preparation. The absorbable vascular stent covering facilitating endothelialization is prepared based on modified silk fibroin and domestic silkworm silk. The inner surface of the absorbable vascular stent covering facilitating endothelialization has a nano topological structure and a matrix-like component simulating a vascular basement membrane, and the outer surface has a micro topological structure. The absorbable vascular stent covering facilitating endothelialization has good mechanical properties and excellent endothelial cell activity, and can be used for producing a vascular stent capable of rapidly forming a new endothelial layer, maintaining stable blood flow, and inhibiting thrombosis and inflammation.

The application relates to a loading device for assisting stent sheathing and a manufacturing method thereof, which is used for sleeving on a sheath tube and comprises a first protection section with a cylindrical lumen and a protection section inner diameter D4, a second protection section with a conical lumen and connected with the first protection section at a large end side, and a loading guide section with a conical lumen and connected with the small end side of the second protection section at a second stage; the protection section inner diameter D4 is larger than the maximum outer diameter D1 of the sheath tube, and the minimum diameter D5 of the second stage is smaller than the minimum inner diameter D2 of the sheath tube. The loading device can assist the vascular stent to enter the inner cavity of the sheath tube, reduces the difficulty of stent sheathing, reduces the labor of doctors, and improves the success rate of surgery.

This invention relates to a cardiovascular stent loading sheath and a retraction system for an advancing stent sheath. The cardiovascular stent loading sheath, through the deformation-sealing opening of a deformable element disposed on the sheath tube, achieves the purpose of sealing the sheath opening after stent deployment. This ensures that when the loading sheath retracts across the stent, the sheath end opening does not snag on the stent, effectively preventing stent displacement and reducing surgical risks.

The application provides a recyclable vascular stent, and belongs to the technical field of interventional treatment instruments; the stent comprises a first stent, a second stent and a separation component; the outer side wall of the first stent is used for directly supporting a blood vessel and can automatically contract in a radial direction; the second stent is coaxially arranged on the inner side of the first stent and is used for supporting the first stent to expand in a radial direction; the separation component is arranged on the first stent and / or the second stent and is used for reducing the friction between the first stent and the second stent; when the stent is taken out, the second stent is gradually taken out from the inner side of the first stent, and the first stent automatically contracts in a radial direction in the process of losing the support of the second stent to reduce the embedding force with the side wall of the blood vessel, so that the taking out of the whole stent is facilitated; and the technical problem that the existing technology has a large resistance and is not easy to take out when the vascular stent is taken out is solved.

The invention discloses a negative Poisson's ratio stent structure for heart and cerebral vessels and an optimization method of the negative Poisson's ratio stent structure, belongs to the technical field of medical instruments, and solves the problems of axial shortening, contradiction between radial supporting force and flexibility and low calculation efficiency in an optimization process of a traditional vascular stent due to a positive Poisson's ratio effect. Wherein a bracket structure of a curved-edge concave hexagonal geometric unit is adopted, and the bracket synchronously extends in the axial direction to present a negative Poisson's ratio effect when being subjected to an expansion load in the radial direction; degradable macromolecules or degradable metals are selected as the material of the stent; according to the optimization method, candidate design is generated through parametric modeling, performance indexes are obtained through finite element simulation, a neural network agent model is trained to predict multi-target performance, a Pareto optimal solution set is obtained through optimization by adopting a multi-target optimization algorithm, and manufacturing parameters are determined through finite element review. According to the invention, the implantation precision and the positioning accuracy of the stent are improved, the mechanical property and the biocompatibility are optimized, and the design efficiency is improved.

The present invention relates to the field of medical device technology, and in particular, to a vascular stent, a vascular stent system, and a method for preparing same. The method comprises: dissolving a degradable water-insoluble polymer in a solvent to prepare a first spinning solution, dissolving a degradable water-soluble polymer in a solvent to prepare a second spinning solution, connecting the first spinning solution and the second spinning solution to an electrospinning device, and performing electrostatic spinning to form a vascular stent. In the described preparation process, the degradable water-insoluble polymer and the degradable water-soluble polymer are subjected to a spinning process for vascular stent processing. When the vascular stent is delivered and expanded in vivo, a degradable water-soluble polymer part of the fiber filament is dissolved in the body fluid, thereby enhancing the slippage capability between fibers and improving the expansion and over-expansion performance of the stent.

The present invention discloses a bioresorbable cardiovascular stent (100). The bioresorbable cardiovascular stent (100) comprising at least one strut (104) (110) connecting the plurality of rhombus-shaped cells (102) in both the longitudinal directions and the circumferential directions and each strut (104) (110) provided with a consistent thickness (108) and width (106). The stent (100) maintains a uniform thickness (108) throughout its length, and featuring struts (104, 110) with consistent thickness (108). The stent (100) is manufactured by using a micro-injection molding process with a single sprue-less hot runner gate. The bioresorbable cardiovascular stent (100) is configured to maintain structural integrity, biocompatible properties, improve radial stiffness to (612 kPa / mm) and radial strength to (225 kPa).

The present application relates to a kind of transarticular vascular stents and its preparation method, transarticular vascular stent includes the first part and second part distributed along the axial direction of transarticular vascular stent;First part includes multiple first stent rings spaced apart along the axial direction of transarticular vascular stent and independent of each other and the whole surface film fixedly arranged on multiple first stent rings;Wherein, from proximal end to distal end, the distance between adjacent two first stent rings gradually increases;Second part includes multiple second stent rings spaced apart along the axial direction of transarticular vascular stent and independent of each other and multiple rows of connecting film groups sequentially arranged along the axial direction of transarticular vascular stent;Each row of connecting film groups includes multiple connecting membranes uniformly distributed along the circumferential direction of transarticular vascular stent, and both ends of each connecting membrane are respectively fixedly connected with adjacent two second stent rings;The width of the rod forming first stent ring is greater than the width of the rod forming second stent ring.

The invention discloses an intravascular stent coating as well as a preparation method and application thereof, and belongs to the technical field of biological materials. The intravascular stent coating is obtained by reaction of a porous coating and an anion solution containing drug molecules, the porous coating contains micro-nano albumin-polypeptide particles stacked on the surface of a stent matrix, and the micro-nano albumin-polypeptide particles are formed by co-assembly of albumin and polypeptide containing hydrophobic amino acid under induction of an oxidizing agent; the porosity of the intravascular stent coating is smaller than that of the porous coating. The intravascular stent coating has excellent biocompatibility and can achieve high loading of drugs, along with degradation of the intravascular stent coating, the released polypeptide and drugs can play dual effects, and the degradation process is beneficial to prolonging the treatment effect of the intravascular stent. The intravascular stent with the intravascular stent coating can reduce or avoid inflammatory response and postoperative complications, and has high application value.

The utility model relates to the technical field of medical instruments, and provides a conveying system which comprises a shell, a finger wheel, a transmission mechanism, a catheter assembly and an intravascular stent. Part of the finger wheel and the transmission mechanism are arranged in the shell, the finger wheel is connected with the transmission mechanism, part of the catheter assembly extends out of the shell, the transmission mechanism is connected with the catheter assembly, and the catheter assembly is used for conveying an intravascular stent; when the finger wheel rotates, the transmission mechanism can be driven to act, and then the catheter assembly is driven to move to release the intravascular stent. The intravascular stent comprises a stent body, and the diameter of the stent body is gradually reduced or gradually reduced in the extension direction of the length of the stent body. According to the conveying system, the stent body is arranged to be in the hollow circular truncated cone shape or the stepped barrel shape, the conveying system can adapt to blood vessel physiological deformation with unequal diameters and taper, blood vessels can be effectively expanded and well attached to the wall, damage caused by excessive expansion to the blood vessels is avoided, and the treatment effect is guaranteed.

The invention relates to an intravascular stent for regulating neutrophil phenotype and a preparation method of the intravascular stent, and belongs to the technical field of cardiovascular implant materials. Specifically, a polymer coating for loading a neutrophil chemotactic active substance and a neutrophil phenotype regulation substance is formed on the outer wall of the intravascular stent. The coating can induce neutrophile granulocytes collected due to intimal mechanical injury caused by intravascular stent implantation to infiltrate into a focus and convert to N2 phenotype. Then, the neutrophil exerts an upstream immune regulation effect, induces the macrophages to be converted from a pro-inflammatory M1 type to a repair-promoting M2 type, further secretes repair-promoting related factors, improves an immune microenvironment related to endangium tissue regeneration and repair, realizes stent surface endothelialization, and finally realizes endangium tissue regeneration and repair.

The invention relates to the technical field of medical instruments, in particular to an intravascular stent conveying system and a conveying method.The intravascular stent conveying system comprises an intravascular stent and a conveying device, and the intravascular stent comprises a telescopic tube, a main tube connected with the front end of the telescopic tube and a plurality of branch tubes connected to one side of the telescopic tube; the conveying device comprises a handle assembly, a main body bending adjusting assembly, a main body releasing assembly, a branch bending adjusting assembly, a branch releasing assembly and an outer sheath assembly. The handle assembly comprises a holding handle, a supporting rod and a guide head which are connected in sequence, and the holding handle is hollow; the outer sheath assembly is arranged on the periphery of the supporting rod in a sleeving mode and located between the holding handle and the guide head. The requirement for bending adjustment during intravascular stent implantation is met, independent release of all structures of the intravascular stent is achieved, the release mode is simple and convenient, the learning curve is short, profound hypothermia circulation arrest is avoided in the whole operation process, the operation difficulty is reduced, and damage to a patient is reduced.

The invention relates to a cardiovascular stent with a double-ultrasonic positioning function, which adopts an ultrasonic positioning principle to position plaques in blood vessels, and comprises a catheter assembly, a balloon component and a vascular stent, the balloon component is arranged at the far end of the catheter assembly, the vascular stent is arranged on the outer side of the balloon component, and the balloon component is arranged on the outer side of the balloon component through special design of a built-in catheter. The balloon catheter has an ultrasonic positioning and imaging function and a double-ultrasonic positioning function, the imaging function in coronary vessels can be achieved on the premise of reducing use of contrast agents and X-rays, accurate positioning of the balloon is achieved, accurate release of the stent is completed, the problem that part of patients are intolerant to the contrast agents is solved, and the balloon catheter has the advantages of being simple in structure and convenient to use. By optimizing the combination mode of the ultrasonic sensor and the intravascular stent, the accuracy and safety of the operation are improved, and a new solution is provided for percutaneous coronary intervention and treatment of cardiovascular diseases.

The invention discloses a guide wire with an intravascular stent. The guide wire comprises a guide wire body and the intravascular stent arranged on the guide wire body in a sleeving mode, and a connecting wire is arranged between the guide wire body and the intravascular stent. The guide wire comprises an inner guide wire and an outer guide wire; the inner guide wire and the outer guide wire are both of tubular structures, the outer guide wire is arranged on the outer side of the inner guide wire in a sleeving mode, and the intravascular stent is located between the inner guide wire and the outer guide wire; the connecting wire is respectively connected with the outer guide wire and the intravascular stent; an easy-to-break point is arranged in the middle of the connecting wire; a stable supporting frame is provided through the double-tube structure of the inner guide wire and the outer guide wire, the inner guide wire serves as a main guide wire and provides hardness and rigidity, accurate positioning of the guide wires in a blood vessel is guaranteed, the outer guide wire plays a protection role, the intravascular stent is prevented from making direct contact with the blood vessel wall in the positioning process, potential damage to the blood vessel is reduced, and the intravascular stent has a good application prospect. The controllability of the guide wire can be effectively improved, so that a doctor can accurately adjust the placement position of the intravascular stent, and the stability and the optimal unfolding effect of the intravascular stent are ensured.

An intravascular device may have a first configuration during deployment and a second configuration after deployment. The first configuration has a first radial strength; and the second configuration has a second radial strength. The first radial strength is less than the second radial strength. A system may include an intravascular device; a wire extending through the intravascular device to expand or contract the intravascular device; a proximal hub coupled to the wire; a distal hub coupled to the wire; and a plurality of tethers extending from an input device and through the intravascular device. At least a portion of the plurality of tethers has electrical conductivity. Application of energy to the at least a portion of the plurality of tethers may disengage the plurality of tethers from the intravascular device and fuse a luminal segment of the plurality of tethers, extending through the intravascular device, to the intravascular device.

The utility model provides a kind of vascular stent, the device includes: first support, first support includes first support unit and first pipe body, first support unit is set on first pipe body, along the length direction of first pipe body extends, and stop and resist the outside wall of first pipe body, first pipe body is distributed with multiple first hollow holes of interval distribution;Second support, second support includes second support unit and second pipe body, second support unit is set on second pipe body, along the length direction of second pipe body extends, and stop and resist the outside wall of second pipe body, second pipe body is distributed with multiple second hollow holes of interval distribution;The end of second support is connected with first support, the lumen of first pipe body is communicated with the lumen of second pipe body.In the utility model, sufficient radial support force is provided while excellent flexibility is guaranteed, the mechanical stress stimulation to blood vessel intima is small, and the long-term patency of main branch and side branch is guaranteed.

The application discloses a multifunctional blood vessel stent with a negative Poisson's ratio structure and a preparation method thereof, relates to the technical field of medical devices, and comprises the construction of a blood vessel stent model with a negative Poisson's ratio structure, selective laser melting additive manufacturing, chemical polishing treatment and surface biomimetic modification treatment. The stent can better adapt to the deformation of a blood vessel by virtue of the negative Poisson's ratio characteristic, reduces incompatibility caused by different deformation steps, the structure of the stent is round and smooth, blood flow turbulence and vortex at sharp corners of a traditional stent can be effectively avoided, the hemodynamic performance is improved, the risk of platelet activation and thrombosis is reduced, a surface gradient coating is prepared, multi-mechanism synergy is realized, and the formation of an endothelial layer on the surface of the stent is facilitated.

The invention relates to a withdrawing system for a cardiovascular stent loading sheath and an advancing stent sheath. According to the cardiovascular stent loading sheath, the opening is sealed through deformation of the deformable piece arranged on the sheath tube, the purpose of sealing the opening of the sheath tube after the stent is released is achieved, the opening in the sheath end cannot be hung on the stent when the loading sheath retreats to cross the stent, displacement of the stent is effectively prevented, and the surgical risk is reduced.

The application discloses a controllable degradation high-corrosion-resistance medical magnesium-aluminum alloy blood vessel stent and a preparation method thereof. The method comprises the following steps: subjecting magnesium alloy ingots containing Al, Zn, Ca and Mn to homogenization treatment, hot extrusion, cold drawing and recrystallization annealing to obtain low-aluminum magnesium-aluminum alloy microtubular materials containing aluminum second-phase non-continuous discrete distribution; after laser cutting, deburring, electrochemical polishing and surface activation, an inner layer rich in MgF2 and an outer layer rich in calcium and phosphorus are sequentially constructed; a polydopamine interface anchoring layer is formed, and a degradable polymer sealing liquid containing a heparinized hyaluronic acid-REDV peptide composite active component is coated to form an active flexible sealing layer after solidification. The stent obtained by the application has good corrosion resistance, controllable degradation, mechanical support retention capacity and endothelial repair promotion performance.

The invention relates to a peripheral artery end-side anastomosis device for passing through a blood vessel intracavity approach. The peripheral artery end-side anastomosis device comprises a conveying system and an artificial blood vessel stent, the artificial blood vessel stent is of a Y-shaped structure with branches. The main body part and the branch part are respectively provided with two rows of small wire rings along the generatrix direction, after the main body part and the branch part are respectively folded, the two rows of small wire rings are overlapped together, and the metal wire sequentially penetrates through the overlapped wire rings to complete diameter binding; the conveying rod composite body is located in the conveying sheath, and the conveying sheath can contain the diameter-restrained artificial blood vessel stent. The conveying rod composite body comprises a thin rod, a thick rod, a balloon and a water injection opening communicated with the balloon. The thin rod comprises a hollow metal rod and a balloon control channel which is attached to the surface and communicated with the balloon. The thick rod is formed by extending the thin rod towards the near end and is provided with two long grooves which are spaced by 180 degrees and are used for containing metal wires, and the water injection port is formed in the near end of the thick rod; the rotating wheel is attached to the handle, and the conveying sheath can be withdrawn or pushed back and forth through rotating operation.