32results about How to "Good radial support" patented technology

The invention provides a vascular thrombus retrieval machine and a thrombus retrieval device which are particularly applicable to retrieving thrombi in intracranial blood vessels. The thrombus retrieval machine comprises an outer-layer stent and an inner-layer stent. The inner-layer stent and the outer-layer stent are netted, the outer-layer stent covers the inner-layer stent, and a gap is formed between the outer-layer stent and the inner-layer stent. The vascular thrombus retrieval machine and the thrombus retrieval device have the advantages that the thrombi can be firmly fixed by the aid of the vascular thrombus retrieval machine in withdrawal procedures after being captured, accordingly, the capturing stability can be improved, the thrombi can be prevented from falling off, the problem of secondary embolism of distal blood vessels due to the fact that plaques on the walls of blood vessels and fragmental thrombus blocks are easy to fall off can be solved, and the vascular thrombus retrieval machine and the thrombus retrieval device are small in size and good in flexibility.

The invention provides a biodegradable intravascular stent and a production method thereof. The biodegradable intravascular stent is characterized in that the biodegradable intravascular stent comprises an annular net structure made of biodegradable fiber braided threads; the annular net structure is composed of a plurality of rows of wavy structures; each row of wavy structure is composed of a plurality of V-shaped structure units; every two rows of wavy structures are parallel to each other; the endpoint in the middle of each V-shaped structure unit is connected with the endpoint in the middle of the symmetrical V-shaped structure unit in the adjacent row once every other two non-joint points to form a joint point. The biodegradable intravascular stent low in axial shortening rate can radially deform greatly due to the annular net structure, and the V-shaped structure units of two adjacent rows are connected once every other two non-joint points, so that the length of the stent is not changed greatly under the condition of great change of radial diameter of the stent, and the intravascular stent can be implanted conveniently by means of a conveyor.

The invention provides a magnesium alloy coronary support frame and relates to a metal coronary artery support frame. The problems that metal preparation which is not degradable of stainless steel, cobalt chrome alloy, platinum iridium alloy, chromel alloy, tantalum and the like are adopted by the prior support frame, toxic reaction is caused due to the fact that the support frame is implanted in a blood vessel as a foreign material are solved. The support frame is carved into a net shape round pipe structure by the magnesium alloy through a laser. The net shape round pipe structure is composed of a plurality of subject units and a plurality of straight line connecting bodies. Each subject unit is composed of a half circular ring, two quarters of round rings and two arcs. The two quarters of the round rings are arranged symmetrically at two ends of the half circular ring. The quarters of the round rings are connected with the half circular ring through the arcs. The plurality of the subject units are uniformly arranged along the axial direction and the circumference direction of a net pipe. Every adjacent two subject units are arranged symmetrically relative to a straight line connecting body in the plurality of the subject units arranged along the circumference direction. Arc top ends of every adjacent two half circular rings are connected with one straight line connecting body. The magnesium alloy coronary support frame is used for clinical curing coronary disease.

The invention discloses a sealing-type self-expanding unit stent. The unit stent includes a main body segment and a developing mark part connected to one end of the main body segment; the main body segment is of a tubular structure and has a shrinking state and an expansion state, wherein under the shrinking state, the main body segment is conveniently put into a blood vessel; under the expansionstate, the main body segment expands in the blood vessel. The main body segment includes triangular waveform units which are connected with one another into a whole part in the circumferential and axial directions of the stent under the shrinking state. Each triangular waveform unit is provided with an octagonal sealing frame body formed under the expansion state. The multi-segment stent can be distributed in a lesion blood vessel part for supporting; after being implanted, compared with stents of the same kind, the sealing-type self-expanding unit stent has the advantages that positioning isstable, a rejection effect on the human body is small, and bloodstream interference is small.

The invention provides a novel thrombus removal device with a built-in barb structure. The thrombus removal device comprises a main body net barrel, a traction portion is arranged at the proximal endof the main body net barrel, multiple barbs warping towards the interior of the main body net barrel are arranged in net holes of the distal end of the main body net barrel, and the barbs are disposedin the circumferential direction of the main body net barrel. Each barb includes a barb top and protection portions on both sides of the barb top, the end parts of the protection portions are connected to grid lines of the main body net barrel to form a whole, and the barbs form a thrombus capturing, anti-falling and anti-escaping structure. The novel thrombus removal device has high thrombus capture capability, and more importantly, the distal protection design is novel and effective.

The invention relates to a vascular stent. The vascular stent comprises multiple supporting rings and multiple connecting rods, and the supporting rings are arranged at the near end and the far end ofthe vascular stent and in the middle of the vascular stent, and are composed of multiple unit waves; every two adjacent supporting rings are connected through a connecting rod; the connecting rod between every two adjacent supporting rings is connected to the wave tops of the two corresponding adjacent unit waves through a top-to-top mode; each connecting rod is composed of one or more first connecting parts, and the first connecting parts are one or a combination of S-shaped connecting parts, N-shaped connecting parts and Z-shaped connecting parts. The vascular stent has the advantages thatby improving the structure, the number of segments of the vascular stent si decreased, the distance between the segments is increased, accordingly, the coverage rate of metal of the stent is decreased, and the flexibility and wall attachment of the vascular stent are improved; multiple holes are formed in a film covering unit, so that the permeability of the film covering unit is improved; statindrugs are loaded onto the film covering unit to accelerate endothelialization of blood vessels.

The invention provides an anti-skid, self-dilating and degradable esophagus stent with a negative Poisson's ratio structure. The anti-skid, self-dilating and degradable esophagus stent with the negative Poisson's ratio structure is characterized by comprising a main stent body made of a totally or partially degradable material, wherein the main stent body comprises an upper end part, a middle partand a lower end part which are connected in sequence, an upper port and a lower port are formed in the top end of the upper end part and the bottom end of the lower end part respectively, and inner diameter of the upper port and inner diameter of the lower port are both larger than inner diameter of the middle part. Minimally invasive implanting of the esophagus stent is realized by the negativePoisson's ratio effect, and the esophagus wall is uniformly stressed in the stent dilating process, so that damage is effectively prevented, axial shrinkage is avoided and the stent is prevented fromdisplacing; meanwhile, by means of the negative Poisson's ratio structure, discomfort of a patient in an eating process can be relieved by the radial process of the stent while displacement is avoidedin the eating and swallowing process of the patient. The esophagus stent dilates automatically and gradually and is biodegradable under external motivation, and the problems of in-stent restenosis, difficulty in taking-out after implantation and the like are effectively solved.

A non-covered vascular scaffold comprises Z-shaped supports and grid supports which are integrally connected directly or connected alternately via one or any of medical macromolecular suture lines, metal rings and macromolecular vascular cloth. The non-covered vascular scaffold is of straight tube, expanded junction or converging structure and has good flexibility and good radial supporting force such that vascular true lumens are reshaped, false lumens are downsized and formation of thrombi in false lumens is promoted. The non-covered vascular scaffold employs a structure of the front end released later and can provide precision positioning; a control wire is passed through the trough of the tail end of the last grid support at the distal end of the vascular scaffold, the control wire is loosened to release the vascular scaffold, and the control wire is retracted to reclaim the vascular scaffold.

The invention discloses intra-arterial medical equipment, namely a carotid artery stent system, which belongs to the field of medical apparatus and instruments. The carotid artery stent system comprises a carotid artery stent and a conveyor, wherein the carotid artery stent is implanted into a pathological blood vessel spot through the conveyor; the carotid artery stent is precompressed into an outer sheath of the conveyor, and is released to a pathological region through withdrawing the conveyor. The carotid artery stent system is characterized in that the carotid artery stent is a self-expansion laser-carved nickel-titanium superelastic alloy stent, and a stent release condition is of a mesh cylinder structure composed of multiple V unit structures, and opposite V units form a diamond mesh, and the stent of the mesh cylinder structure consists of three sections, wherein every three diamond meshes of big mesh sections at the two ends have a cross structure, and every two diamond meshes of small mesh sections in the middle have a cross structure, and the stent shrinks in a peak-to-valley manner when being bent; the top end of the conveyor is of a biconical head end shape. Compared with the prior art, the stent has the advantages of more excellent blood vessel adherence performance and flexibility, good non-deformability and good durability and the like by utilizing the design characteristics of the stent itself.

The invention discloses a variable radial support force optimization method of an artificial interventional aortic valve stent. The optimization method belongs to the technical field of artificial interventional aortic valve stent optimization. The method specifically comprises the following steps of: optimizing a support grid structure, optimizing a support rib structure and optimizing a supportmaterial. The optimization method is simple in principle, does not change the overall size of an original stent, inherits the core design concept and method of the original stent, optimizes the radialsupporting force of a non-lesion region on the basis of the treatment effect of the original stent on the lesion region, and can select a diversified optimization scheme according to different practical application scenes, thereby solving a practical problem from multiple angles by using multiple schemes. Meanwhile, the optimization method has higher feasibility. The invention provides scientificand reasonable design thoughts and research and development directions for scientific research workers engaged in artificial interventional aortic valve stent design, shortens the research and development period and improves the research and development benefit.

The invention provides a regional blood flow guiding device as well as a preparation method and a use method thereof, and mainly aims to insulate a wide-necked aneurysm and a parent artery blood vessel and ensure blood flow in a collateral vessel to be unblocked. The regional blood flow guiding device comprises a skeleton, a regional dense net area, end part connection ribs and developing markers. The preparation method comprises the steps of skeleton cutting, residue removing, heat treatment and formation, acid pickling, polishing, marker assembling, and dense net area producting. The use method comprises the following steps: pressing the regional blood flow guiding device into a transferring sheath, sending the transferring sheath to a diseased region, locating under X rays via the developing marker of the regional blood flow guiding device, and releasing the device, wherein the dense net area completely covers the aneurysmal neck part of the wide-necked aneurysm, and blood flow in the collateral vessel is prevented from being unblocked. Compared with the prior art, the problem that the conventional regional blood flow guiding device is easy to cause blockage of the collateral vessel is solved, and operation risk is reduced effectively.

The invention discloses a complex support rib vascular stent. The stent is a hollowed-out tube and comprises multiple groups of hollowed-out rings, each group of hollowed-out rings comprise a first hollowed-out ring unit and a second hollowed-out ring unit which are in mirror symmetry; each first hollowed-out ring unit comprises multiple first sawtooth-shaped support ribs which are connected end to end and attached to a cylindrical surface where the inner wall of the hollowed-out tube is located; each first sawtooth-shaped support rib comprises a first support rib, a second support rib, a first support connecting rib, a third support rib and a fourth support rib which are sequentially connected; each second hollowed-out ring unit comprises multiple second sawtooth-shaped support ribs which are connected end to end and attached to the cylindrical surface where the inner wall of the hollowed-out tube is located; each second sawtooth-shaped support rib comprises a fifth support rib, a sixth support rib, a third support connecting rib, a seventh support rib and an eighth support rib which are sequentially connected. The vascular stent has good flexibility and thus can be pressed and held on a balloon to be smoothly conveyed to the affected part and has the capacity of smoothly passing complex vessels to reach the lesion part.

In a sewing machine (1) with a base plate (2), a support plate (3), a bearing for tilting the support plate relative to the base plate about a folding axis (4), an upper arm (5), a stand (6) connected to the base plate and upper arm and an operating lever (9) below the support plate, leading from a housing (7) and acting via a tilting element in combination with a lifting rod (18) in the stand for raising at least a sewing implement(s) (10), the operating lever is joined to the tilting element in such a way that the tilting of the lever relative to the rod about a tilting axis (19) approximately parallel to the folding axis is possible. Thus, the obtained sewing machine can easily turn over around the tilting axis without demolishing the operating lever.

The invention provides a thrombectomy bracket with a gradually changing mesh, comprising a main body mesh cylinder, wherein the proximal end of the main body mesh cylinder is provided with a tractionpart. The bracket is characterized in that the mesh size of the distal end of the main body mesh cylinder is smaller than the mesh size of the proximal end of the main body mesh cylinder, and the mesh is more compact. The bracket has remarkable radial support force, excellent compliance, good adherence to the wall and distal protection capability.

A torsional vibration damper for operation in an oil bath comprising an input flange for connecting to a drive motor, an output flange for connecting to a transmission, and a bow spring for the torsionally elastic coupling of the input flange to the output flange, where the bow spring is in contact radially on the outside with an encircling holding device that is formed on one of the flanges. At the same time, the holding device has an opening in the area of the bow spring, in order to enable a flow of oil through an area of contact of the bow spring with the holding device.

The invention relates to an intravascular stent. The intravascular stent comprises a plurality of supporting rings and a plurality of connecting rods, wherein the supporting rings are distributed at intervals in the length direction of the intravascular stent, the connecting rods are arranged between and connected with every two corresponding adjacent supporting rings, and the wall thickness of at least one part of the connecting rods is smaller than the wall thickness of the supporting rings. According to the intravascular stent, the design of different wall thicknesses can be carried out in a specified position area, and the detail structure of the intravascular stent is adjusted to achieve the effect that the intravascular stent has different wall thicknesses, so the flexibility of a thinned position (namely a connecting rod) can be ensured, the generation of a low-shear-stress area is reduced, vortex generation probability is reduced, a secondary stenosis rate is reduced, the strength of other positions (namely the supporting rings) with the non-thinned walls is ensured, and the whole intravascular stent still keeps good supporting performance.

The invention relates to a blood vessel implant. The blood vessel implant comprises an implant body, a first end and a second end, wherein the first end and the second end are located at the two axial ends of the implant body; at least one first end developing mark is arranged at the first end, and at least one second end developing mark is arranged at the second end; the implant body is formed by weaving at least two weaving wires in a staggered mode, and at least one weaving wire of the weaving wires has developing performance; each weaving wire comprises a core wire and a sleeve wrapping the core wire, wherein the sleeve is made of nickel-titanium alloy, the core wire is made of platinum, and the sectional area of the core wire accounts for 20%-35% of the total sectional area of the weaving wire; and the ratio of the identification degree of the first end developing mark to the identification degree of the implant body to the identification degree of the second end developing mark under X rays is 0.99: (0.32-0.66): 1.0, the relative density of the material of the blood vessel implant is 15-25, and the thickness of the blood vessel implant in the X ray direction is 0.015mm-0.2mm. Through the configuration, the developing performance of the two ends of the blood vessel implant under the X rays is superior to the developing performance of the middle section of the implant, and meanwhile various properties of the blood vessel implant can be ensured.

The invention relates to a wind-driven generator stator and rotor sleeving tool, which comprises a stator bracket and a rotor connector, wherein the stator bracket and the rotor connector are connected by means of a guiding device, the stator bracket comprises a stator concentric disc, the stator concentric disc is connected with a stator core by means of a rotary connecting column, a plurality ofconnecting arms are arranged on the periphery of a connecting column in an annular array, and two groups of guide rail pieces in mirror symmetry are fixed to the end part of each connecting arm; theguiding device comprises a guiding surface, the guide rail pieces are fixed to the two transverse sides of the guiding surface by means of one edges in the width direction, and the other edge of the guide rail pieces are provided with limiting protruding strips; the guiding device further comprises a sliding support fixed on a rotor outer shell, the sliding support comprises an arc-shaped rotor connector, a stator contactor is fixedly connected to the lower part of the rotor connector, and the stator contactor comprises a plurality of sliding contact surfaces used for being in contact with thesurface of a stator; and the stator contactor and the rotor connector are both fixed on a sliding connector, and a plurality of limiting sliding blocks are symmetrically arranged on the sliding connector.

The invention discloses a multi-core tensile network cable, include a protective coat, a reinforcing layer, a support layer and a core layer, the inner side of the protective outer layer is provided with a reinforcing layer, A plurality of first reinforcing ribs are arranged in the reinforcing layer, the axial direction of the reinforcing rib is arranged parallel to the axial direction of the network line, the inner side of the reinforcing layer is provided with a support layer, The inner side of the support layer is provided with a core wire layer, and the core wire layer sequentially comprises an insulating outer film, a filler, an insulating inner film and a plurality of core wires from the outside to the inside. The core wire is formed by screwing a plurality of wires, and the insulating inner film is wrapped on the outer side of the core wire. A filler is arranged between the insulating outer film and the insulating inner film. The invention discloses a multi-core tensile networkwire, which is simple in structure, comprises a plurality of first reinforcing ribs in a reinforcing layer and a plurality of second reinforcing ribs in a supporting layer, wherein the reinforcing ribs can improve the ductility and tensile performance of the network wire, so that the network wire is not easy to be damaged or broken when subjected to axial tensile force.

The invention relates to an integrated pre-tightening force-limiting retractor, the retractor includes a moving shaft, a fixed shaft, a pre-tightening wheel, a bracket, and a force-limiting rod; one end of the moving shaft is installed on the fixed shaft , the fixed shaft is equipped with a pre-tightening wheel; one end of the pre-tightening wheel is provided with a support ring; the outer periphery of the support ring is supported on the bracket; the outer end of the fixed shaft is equipped with a load wheel; The radial support of the bearing wheel has a cover; the support ring and the fixed shaft are designed in one piece; one end of the support ring is docked with the pretension wheel, and the other end is docked with the moving shaft. Its advantages are as follows: the integrated design of the support ring and the fixed shaft prevents the support ring from shifting due to the rotation of the pre-tensioner wheel, thereby better radially supporting the bracket; Rotation and displacement, so as to better radially support the stent, so that the force value in the force-limiting stage remains stable.

The invention provides a stent-graft, comprising a stent body and a film, the stent body is arranged on the surface of the stent body, the stent body includes a main body stent part and a branch stent part, two branch stent parts and a main body stent part are connected with each other The covering film is fixedly connected and forms a Y-shaped structure. The stent body includes several annular stent segments arranged at intervals in the axial direction. and the transition zone; the outer diameter of the transition zone decreases from the proximal end to the distal end; the main body zone has the same outer diameter; the outer diameter of the proximal end of the transition zone is the same as the outer diameter of the main body zone; The proximal sealing area includes a proximal sealing bracket section, the transition area includes a transition bracket section, and the main body area includes a main body bracket section; the maximum length of the wave rod of the proximal sealing bracket section is less than that of the main body bracket section The length; this configuration improves the flexibility of the covered stent and reduces the risk of endoleak and displacement.

The invention discloses a five-claw elastic pneumatic clamping device for a turning and grinding machine tool. The device comprises a piston body, a cylinder assembly, a clamping assembly and a compressed spring assembly, wherein a piston rod is connected to the piston body in a sliding mode; the cylinder assembly comprises a self-locking cylinder shaft, a cylinder body and a cylinder cover, the self-locking cylinder shaft, the cylinder body and the cylinder cover are all arranged inside the piston body, one end of the cylinder body is fixed to one end of the self-locking cylinder shaft, and the cylinder cover is fixed to the other end of the cylinder body; the clamping assembly comprises a special-shaped five-claw part and a V-shaped locating block, one side wall of the V-shaped locatingblock is arranged at the other end of the self-locking cylinder shaft, the special-shaped five-claw part is arranged on the other side wall of the V-shaped locating block, and the special-shaped five-claw part, the V-shaped locating block and the self-locking cylinder shaft are sequentially connected through bolts; and the compressed spring assembly comprises a compressed spring seat, a compressedspring locating sleeve and a rectangular compressed spring, the compressed spring seat is arranged opposite to the compressed spring locating sleeve, and the rectangular compressed spring is arrangedis arranged between the compressed spring seat and the compressed spring locating sleeve. The clamping device is good in structure compactness, good in clamping consistency, safe and reliable in clamping and high in adjustment precision controllability.

The invention provides an anti-slip self-expanding degradable esophageal tube stent with a negative Poisson's ratio structure, which is characterized in that it includes a stent body made of all or part of degradable materials, and the stent body includes sequentially connected The upper end, the middle part and the lower end, the top of the upper end and the bottom of the lower end respectively form an upper port and a lower port, and the inner diameters of the upper port and the lower port are larger than the inner diameter of the middle part. The present invention can utilize the negative Poisson's ratio effect to realize minimally invasive implantation of the esophageal tube stent, and the esophageal wall is evenly stressed during the expansion process of the stent to effectively avoid damage and avoid axial contraction to avoid migration of the stent; at the same time, the negative Poisson's ratio structure satisfies the needs of patients. During eating and swallowing, while the stent avoids displacement, the radial process of the stent can reduce the discomfort of the patient during eating. The invention gradually expands autonomously and is biodegradable under external excitation, and effectively avoids problems such as restenosis in the stent and difficulty in taking it out after implantation.

The invention discloses a five-claw elastic pneumatic clamping device for a turning and grinding machine tool, which comprises: a piston body, on which a piston rod is slidably connected; a cylinder assembly, which includes a self-locking cylinder shaft, a cylinder body and a cylinder head, The self-locking cylinder shaft, cylinder body and cylinder head are all located inside the piston body, one end of the cylinder body is fixed on one end of the self-locking cylinder shaft, and the cylinder head is fixed on the other end of the cylinder body; the clamping assembly includes special-shaped five Claws and V-shaped positioning block, one side wall of the V-shaped positioning block is set on the other end of the self-locking cylinder shaft, the special-shaped five-claw is set on the other side wall of the V-shaped positioning block, and the special-shaped five-claw, V-shaped positioning block It is connected with the self-locking cylinder shaft in sequence through bolts; the compression spring assembly, the compression spring assembly includes a compression spring seat, a compression spring positioning sleeve and a rectangular compression spring, and the compression spring seat and the compression spring positioning sleeve are arranged oppositely, and the rectangular compression spring is located on the two between. The clamping device has good structure compactness, good clamping consistency, safe and reliable clamping, and strong controllability of adjustment precision.

The invention provides a sectional type bare stent, which comprises a tubular stent formed by a plurality of wavy supporting pieces connected in the axial direction, and each wavy supporting piece isof an annular structure arranged in a wavy mode. The tubular stent comprises a near-end supporting mechanism, a middle-area supporting mechanism and a far-end supporting mechanism which are connectedin sequence. The near-end supporting mechanism comprises a near-end end face, and the near-end end face is perpendicular to the axis of the near-end supporting mechanism. According to the sectional bare stent provided by the invention, the tubular stent is formed by adopting the wavy supporting piece with the annular structure; which has good radial supporting force, and can be aligned at the near-end end face of the near-end supporting mechanism, so that the near-end supporting mechanism has high supporting force in the circumferential direction when applied to a bifurcated blood vessel, andthe near-end supporting mechanism can be prevented from being pressed by an artery stent nearby the near-end supporting mechanism or hard tissue nearby the bifurcated blood vessel to deform.

The invention discloses a magnesium-zinc alloy biliary stent and a preparation method, and relates to the technical field of biliary stents.The preparation method comprises the following steps that S1, a magnesium-zinc alloy casting blank is selected, the mass fraction of Zn is 1.8%-2.2%, and the balance is Mg; s2, the magnesium-zinc alloy casting blank is subjected to single-pass extrusion at the temperature of 330-350 DEG C, and an extruded pipe is obtained; s3, the extruded pipe is subjected to multi-pass room temperature rolling deformation, and a rolled pipe is obtained; s4, the rolled pipe is subjected to hot drawing at the temperature of 230-260 DEG C, and a magnesium-zinc alloy pipe is obtained; s5, a spiral groove is machined in the peripheral face of the magnesium-zinc alloy pipe, and the magnesium-zinc alloy pipe is divided into annular supporting parts at the two ends and a spiral supporting part in the middle; and S6, the magnesium-zinc alloy pipe is subjected to electrolytic polishing, burrs are removed, and the surface is activated. The magnesium-zinc alloy biliary stent is high in dimensional precision, good in mechanical property, high in flexibility, good in radial supporting force and long in degradation service cycle.

The invention relates to a quick-change system for changing attachments on a construction machine. THE quick-change system for changing attachments on a construction machine includes a quick changer (1) mounted to rotate in a drive housing (4) of a rotary device (3) and rotatable relative to drive housing (4) by a rotary drive (9, 10), and a rotary joint (6) arranged in the drive housing (4) with a stator (7) and a rotor (8) rotatable within THE stator (7) to supply a working fluid to the quick changer (1). In order to permit simple and stable fastening of the rotary joint, the stator (7) of the rotary joint (6) arranged within a through-opening (30) of the drive housing (4) is radially supported against the drive housing (4) above an upper end surface (38) and beneath the upper end surface (38) of a drive wheel (10) of the rotary drive (10) arranged in the drive housing (4).

The invention relates to an integrated pre-tightening force limiting type retractor. The retractor comprises a movable shaft, a fixed shaft, a pre-tightening wheel, a support and a force limiting rod. One end of the movable shaft is mounted on a fixed shaft, and a pre-tightening wheel is mounted on the fixed shaft; a supporting ring is arranged at one end of the pre-tightening wheel; the periphery of the supporting ring is supported on the bracket; a bearing wheel is mounted at the outer end of the fixed shaft; a cover cap is supported in the radial direction of the bearing wheel; the supporting ring and the fixed shaft are integrally designed; one end of the supporting ring is in butt joint with the pre-tightening wheel, and the other end of the supporting ring is in butt joint with the movable shaft. The support has the advantages that the support ring and the fixed shaft are integrally designed, so that the support ring cannot move due to rotation of the pre-tightening wheel, and the support can be better supported in the radial direction; and the supporting ring cannot move due to rotation of the pre-tightening wheel, so that the support is better supported in the radial direction, and the force value in the force limiting stage is kept stable.

The invention discloses a detachable esophageal stent and a preparation method thereof. The detachable esophageal stent consists of three bracket alloy wire weaving sheets; the surfaces of the bracket alloy wire weaving sheets are coated with a layer of silicon rubber; the bracket alloy wire weaving sheets are connected in a seaming manner through poly(lactic acid-hydroxyacetic acid) copolymer (PLGA) and are prepared from nickel-titanium memory alloy. The invention discloses all technologies of synthesis, extrusion processing and stretching filamentation of PLGA and discloses technologies for weaving, coating and connecting the detachable esophageal stent. The detachable esophageal stent keeps the characteristic of high radial supporting force of a metal bracket and has the biological degradability of a degrading material; the detaching of the bracket is controlled by regulating the degrading time of PLGA, so that the aims of provisionality and periodicity which are clinically required are fulfilled; a brand new measure and a method are provided for treatment of benign esophageal stricture.