259 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 provides a conveying system and a medical instrument. The delivery system includes a handle body, a branch channel establishment assembly, and a bundle diameter adjustment assembly. And the bending degree of the deformable part in the second state is greater than that of the deformable part in the first state. The compression degree of the intravascular stent in the fourth state is smaller than that of the intravascular stent in the third state. The deformable part can move in the axial direction of the handle body so that the far end of the deformable part can move to the open window of the intravascular stent, and the deformable part in the second state can stretch out of the open window. According to the intravascular stent, the branch channel establishing assembly and the beam diameter adjusting assembly are matched with each other, when the intravascular stent is in the fourth state, the deformable part in the second state extends out of the open window, and the branch channel is accurately established, so that the accuracy of the branch channel is improved, and the treatment effect is improved.

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 relates to the technical field of intelligent stents, in particular to a super-flexible electronic device capable of being integrated on an intravascular stent and application of the super-flexible electronic device. The invention provides a super-flexible electronic device. The super-flexible electronic device comprises a self-expansion intravascular stent, a flexible substrate and an electrode, wherein the flexible substrate and the electrode are sequentially stacked on the surface of the self-expansion intravascular stent; the self-expansion intravascular stent is of a grid structure; the flexible substrate is of a grid structure, and the flexible substrate covers the surface of a part of grid lines of the grid structure; the electrode is located on the surface of the flexible substrate. The super-flexible electronic device has a deformation characteristic and does not affect the mechanical property of the support in the deformation process, and meanwhile the super-flexible electronic device has a signal monitoring function.

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 present invention provides a molybdenum-based alloy and a preparation method therefor, and a medical implant device and a preparation method therefor. The molybdenum-based alloy comprises a molybdenum matrix, polydopamine, and an alloy element, wherein the alloy element comprises at least one of a strengthening-toughening alloy element and a purification alloy element, the strengthening-toughening alloy element comprises at least one of a tantalum element, an iridium element, and a platinum element, and the purification alloy element comprises at least one of a strontium element, a titanium element, and a cerium element. The medical implant device is made of the molybdenum-based alloy. The present invention can solve the problems of room-temperature brittleness and anisotropy of molybdenum-based alloys, thereby improving the comprehensive performance of the molybdenum-based alloys, guaranteeing that a medical implant device such as a vascular stent prepared from the molybdenum-based alloy provided by the present invention has excellent mechanical properties under an in vivo use temperature condition.

The invention belongs to the technical field of intravascular stents, and particularly discloses a degradable peripheral artery stent, the cross section of the degradable peripheral artery stent is of an annular structure, the degradable peripheral artery stent is applied to the peripheral artery of the human body and comprises a plurality of supporting units and connecting units in the axial direction of the stent, the connecting units are located between the supporting units, and the adjacent supporting units are connected through the connecting units; the supporting unit comprises an end supporting unit and a middle supporting unit, and the end supporting unit and the middle supporting unit are each of a closed-loop structure formed by intersecting a sine-like curve and a reverse sine-like curve. The stent is integrally formed through a 3D printing technology, and is high in structural stability and good in flexibility. According to the degradable peripheral artery stent of the structure, degradable polylactic acid is adopted as a stent material, inflammatory reaction caused by the fact that the stent exists in blood vessels for a long time is greatly avoided, and the stent has good flexibility and adherence performance under the condition that the stent has enough radial supporting force; and the risk of restenosis after the stent operation is reduced.

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.

The invention discloses a long-section peripheral vascular stent which is used for treating diseases such as peripheral vascular stenosis below knees and the like and solves the problems that an existing stent is difficult to introduce into peripheral blood vessels and lacks effective support. The stent has two states of a pressing and holding state and an expansion state with different section radiuses, is implanted into a peripheral vascular affected part in the pressing and holding state, and supports a blood vessel at the affected part in the expansion state. Sufficient radial yield strength is provided through a plurality of supporting rings so as to adapt to the characteristics that the peripheral blood vessel is large in elasticity and thick in outer base layer. And the stent is prepared from a degradable material, so that mechanical support required in the early stage of fusion is met, the stent also has relatively high strength and toughness, and the stent can be degraded in vivo, so that the use safety is greatly improved. Moreover, the pattern of the stent is optimized, so that the circumferential rotation phenomenon of the longer intravascular stent in the expansion process is improved, and the damage to the vascular wall in the implantation process is reduced to the greatest extent.

The invention discloses a passive brain-computer interface system based on an intravascular stent. The passive brain-computer interface system comprises at least one extensible intravascular stent, a charging module, a brain signal receiving module and a brain signal analysis module, the expandable intravascular stent comprises a stent net, an intracranial physiological signal detection module, a wireless charging module, a wireless communication module and a stent circuit, the wireless charging module is used for receiving a wireless charging signal sent by the charging module and providing a power supply signal according to the wireless charging signal; the brain signal receiving module is used for sending a received brain signal to the brain signal analysis module; and the brain signal analysis module is used for obtaining an analysis result according to the brain signal. According to the embodiment of the invention, an intracranial electroencephalogram signal can be collected in a low-risk manner.

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 invention provides a biological vascular stent material and a preparation method thereof, and belongs to the technical field of biomedical materials. The polylactic acid-polyvinyl alcohol emulsion is used as a skin layer spinning solution, a sodium alginate solution containing exosomes is used as a core layer spinning solution, a composite material is prepared through a coaxial electrostatic spinning technology, and the biological vascular stent material is obtained in cooperation with a post-treatment process, so that the porosity of the material is effectively improved, and the biological vascular stent is prepared. Meanwhile, the elongation and the supporting force of the intravascular stent are increased.

The invention relates to the technical field of intravascular stents, and discloses an implantation device for an intravascular stent, the implantation device comprises a box body, the box body is provided with a disinfection mechanism, and the disinfection mechanism comprises a rotating shaft, a knob, a placement disc, a fixing rod, a rotating cylinder and a UVC sterilization lamp; the rotating shaft penetrates through the back face of the box body through a bearing, the rotary knob is fixedly connected to one end of the rotating shaft, the outer wall of the rotating shaft is fixedly sleeved with the containing disc, the fixing rod is fixedly connected to the inner wall of the box body, the rotating cylinder is rotationally connected with the fixing rod through a bearing, and the number of the UVC sterilization lamps is two. And the two UVC germicidal lamps are symmetrically arranged on the inner wall of the rotary drum. By arranging the box body and the box cover, catheters can be stored, the situation that secondary infection is caused in the transportation process, and consequently the success rate of an operation is affected is avoided, the catheters in the box body can be rapidly sterilized and disinfected by arranging the UVC sterilization lamp, and therefore the success rate of intravascular stent implantation is increased.

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.

A branch stent, including a stent body and a skirt structure disposed on the stent body. The stent body includes a main body stent and a main body covering film disposed on the main body stent. The skirt structure includes a sealing stent segment connected to the stent body and a fixing stent segment connected to the sealing stent segment, and the skirt structure is provided with a developing structure. For the branch stent, a branch opening of a vascular stent is sealed by the sealing stent segment to prevent endoleaks. The fixing stent segment can be folded, and is automatically folded after being released from a delivery sheath, to prevent the branch stent from moving. Also, the skirt structure is provided with the developing structure for displaying the state of the skirt structure after being released from the delivery sheath, making it convenient for an operator to observe.

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 present invention provides a vascular stent delivery system, a vascular stent and a recovery mechanism connected to the vascular stent; the recovery mechanism includes multiple introduction wires, a locking nail, a locking wire, a middle tube, a small sealing handle, a locking button and a rivet, multiple introduction wires are inserted and connected to the vascular stent, the head ends of multiple introduction wires are in a free state, the tail ends of multiple introduction wires are limited to the locking nail, the locking nail is detachably fixed to the front end of the middle tube, the small sealing handle is sleeved on the tail end of the middle tube, a locking wire through hole is formed on the middle tube, the proximal end of the locking wire is inserted into the locking nail, the distal end of the locking wire passes through the locking wire through hole and is riveted to the locking button through the rivet, and the locking button is clamped to the small sealing handle. The vascular stent of the present invention can accurately adjust the position, has a simple structure, and is easy to operate.

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.