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 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.

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 stent for blood vessels with complex supporting tendons. The stent is a hollow tube and includes multiple groups of hollow rings; each group of hollow rings includes a first hollow ring monomer and a second hollow ring arranged symmetrically in a mirror Single body; the first hollow ring single body includes a plurality of first zigzag support ribs connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located; the first zigzag support ribs include first support ribs connected in sequence, and the second The supporting ribs are the first supporting connecting ribs, the third supporting ribs and the fourth supporting ribs; the second hollow ring monomer includes a plurality of second zigzag supporting ribs connected end to end and fitted with the cylindrical surface where the inner wall of the hollow tube is located; the second The two zigzag supporting ribs include the fifth supporting rib, the sixth supporting rib, the third supporting connecting rib, the seventh supporting rib and the eighth supporting rib connected in sequence. The invention has good flexibility, which enables the stent to be smoothly transported to the affected area by being pressed and held on the balloon, and can ensure the ability of the stent to pass through complex blood vessels and reach the lesion position smoothly.

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 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 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 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.