127 results about "Intra stent" patented technology

Apparatus and methods for an implant are provided. The implant may have a constrained configuration and a relaxed configuration. The implant may include an outer stent and an inner valve support. The inner valve support may be positioned within the outer stent. The implant may include a transition section spanning between the outer stent and the inner valve support.

The invention relates to an intracavity implantation system which comprises an intracavity prosthesis, the intracavity prosthesis has a radial expansion state and a radial contraction state, the intracavity prosthesis comprises a covered stent, a valve prosthesis and a flexible connecting pipe, the covered stent is of a tubular structure and comprises a main body section and a reducing section which are communicated with each other, and the valve prosthesis is arranged in the main body section. The main body section and the reducing section are arranged in the axial direction of the covered stent, the cross section area of the near end of the reducing section is smaller than that of the far end of the reducing section, the covered stent is further provided with a window penetrating through the side wall of the covered stent, and at least part of the area of the window is located in the reducing section; the valve prosthesis comprises a valve support and an artificial valve leaflet connected to the interior of the valve support. The flexible connecting pipe is of a tubular structure defined by a flexible film, the far end of the flexible connecting pipe is connected with the reducing section, the near end of the flexible connecting pipe is connected with the valve prosthesis, and the two axial ends of the flexible connecting pipe are communicated with the covered stent and the valve prosthesis respectively. In the implanting process of the endoluminal prosthesis, the relative position of the valve prosthesis and the covered stent can be adjusted according to the lumen structure, and the endoluminal prosthesis can better adapt to various lumen structures. In addition, due to the arrangement of the flexible connecting pipe, the risk that the far end of the valve prosthesis is driven to expand and deform due to expansion of the covered stent can be reduced, force generated in the expansion process of the valve prosthesis is not prone to being transmitted to the covered stent, and therefore the risk that coronary blood flow is blocked due to expansion of the near end of the covered stent can be reduced.

A replacement heart valve comprises a unibody, folded, double-wall stent, with a stent cover and a leaflet valve attached to the inner lumen of the stent. The heart valve is delivered using a multi-pulley, suture-based stent restraint assembly provided by fixed guide openings or structures along the distal end of the delivery system that independently permits expansion of the distal and proximal ends of the outer wall of the stent, and control of the inner wall expansion simultaneously with or separately from the expansion of the outer wall.

A stent assembly that is assembled in situ by separate delivery of two nested stents is configured to maintain a lumen in a bifurcated vessel. The stent assembly includes a first stent with a first opening at a first end, a second opening at a second end, and an intermediate opening on a lateral side of the first stent between the first and second openings. The stent assembly further includes a second stent with a first opening at a first end, a second opening at a second end and an intermediate opening on a lateral side of the second stent between the first and second openings. A portion of the second stent with the intermediate opening is nested within the first stent.

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 provides a cardiology department nursing transfer bed, and relates to the field of transfer beds. The nursing transfer bed for the department of cardiology comprises a bottom frame, a support is arranged at the upper end of the bottom frame, a supporting plate is fixedly connected to the middle of the inner wall of the support, and a reinforcing rod is fixedly connected to the front end, close to the supporting plate, of the support. According to the invention, a synchronous electric push rod drives a cam rotating stand, a connecting rod and a connecting rotating rod to be linked, and the cam rotating stand and a fixed rod are matched structurally, so that the bed body is stably lifted and can be accurately matched with the heights of a ward bed, an examination bed and the like, and a servo motor, a screw rod, a threaded sleeve block, a hinge rod and an auxiliary rotating rod are matched to achieve a synergistic effect; the angle of the head plate can be stably and accurately adjusted, the first electric push rod achieves flexible adjustment and control of the leg plate to form a sitting posture state, the second electric push rod drives the whole bed body to rotate through the connecting frame and the rotating column, and physical load and operation risks are greatly reduced when nursing personnel transfer a patient.

An intravascular device and methods of using the same are provided. An expandable portion includes struts movable between a collapsed position and an expanded position, and tissue modification element(s), each having a lower portion residing within or attached to one of the struts, an upper portion which extends outwardly from an outer surface of the strut and physically interacts with tissue during use. Irrigation and / or suction device(s) are provided for providing at least one of irrigation fluid and suction force at the expandable portion when operated.

The present application relates to a kind of based on photodynamic therapy and radiotherapy and chemotherapy treatment stent and its preparation method.The present application includes stent body, stent body is mesh stent, mesh stent is provided with fixed frame, fixed frame includes the 4 support frames of cross arrangement, the cross point of 4 support frames is hinged connection.The present application is simple in structure, easy to make, convenient to use, can be made into different specifications and models, applicable to different tumor size, reduce the damage to normal tissue.

The application relates to a kind of luminal stents and stent systems, the luminal stent includes main body stent, first recess portion, first inner branch, first through hole and second through hole;The main body stent includes first side and second side in the circumference, the first recess portion is arranged at the first side and is recessed towards the inside of the main body stent, the first inner branch is arranged at the proximal side of the first recess portion;The first through hole is arranged at the proximal side of the first recess portion and is communicated with the first recess portion, the second through hole is arranged at the distal end of the first recess portion and is communicated with the first recess portion, the first through hole, the first recess portion and the second through hole form an axial channel in the main body stent close to the first side.The luminal stent provided by the application is convenient to be transported, and the sheath core can pass through, the first recess portion can be positioned at the large bending side of the arch portion by the sheath core, so that the first recess portion is driven by the sheath core and corresponds to the arch upper branch port of the large bending side.

A prosthetic heart valve may include an expandable stent having a plurality of struts forming cells connected to one another in a plurality of annular rows around the stent, a cuff attached to an annulus section of the stent by cuff sutures that have a plurality of stitches extending through material of the cuff and looping around the struts, and a plurality of leaflets each having a belly attached to the cuff within an interior region of the stent. The leaflets may together have a coapted position occluding the interior region of the stent and an open position in which the interior region is not occluded. The belly of each leaflet may be attached to the cuff by leaflet sutures extending in a path that crosses some of the struts in overlap zones. Those struts may be devoid of the stitches within the overlap zones.

The application provides an atrial stent and relates to the technical field of medical devices.The atrial stent comprises a ball cage, a cylindrical stent, a sealing membrane and an artificial valve; the ball cage is supported in an atrium, and a ball cage opening is formed in the bottom end of the ball cage; the cylindrical stent extends from the ball cage opening to the inside of the ball cage; the sealing membrane covers the bottom of the ball cage and the cylinder wall of the cylindrical stent; and the artificial valve is located in the cylindrical stent.In the application, the ball cage is supported in the atrium after surgery, and the structure is stable, so that relative displacement of the ball cage and the original valve cannot be caused by the beating of the heart or the flushing of blood; and the blood in the atrium can flow into the ventricle through the cylindrical stent; the original valve still maintains the original function; the artificial valve and the original valve form a double-valve structure; and the regurgitation caused by the incomplete closure of the original valve during the output of the blood in the ventricle is blocked by the artificial valve, so that the functional defects of the original valve are complemented, and an ideal interventional treatment effect can be achieved.

The invention belongs to the technical field of artery stents, and particularly relates to a degradable coronary artery stent and a preparation method thereof. Wherein the degradable coronary stent is of a tubular network structure prepared by a main frame and connecting rib components, the main frame is of an open network structure, anchoring points are arranged at nodes, and the connecting rib components are detachably connected and lock the main frame through the anchoring points to form an integral rigid structure, so that the elastic retraction force after a blood vessel is implanted is effectively resisted; the connecting rib component is gradually degraded and loses the locking capacity along with the promotion of vascular repair, the loaded rapamycin is synchronously released, smooth muscle cells with active proliferation are accurately inhibited, the risk of restenosis in the stent is reduced, meanwhile, the activity of the main framework is recovered, the main framework slightly deforms along with vascular pulsation, and vascular intimal injury and inflammatory response are reduced.

A stent is provided with a central portion between two end portions, and with the central portion narrower than the end portions to provide a stenosis within the stent, such as for improving function of a dialysis graft or fistula. The stent can be merely a metal wire cage or can additionally include a liner inside and / or outside of the metal cage. One stent includes tapering transitions between the end portions and the central portion. The stent can be self-expanding with a retracted form held by a surrounding sheath until the sheath is retracted and the stent returns to its biased expanded form. A balloon can provide a radial expansion force to expand the stent. The balloon or self¬ expansion can expand the stent partially, with the central portion narrower than the end portions, and optionally further expanded to have a diameter matching that of the end portions.

The utility model provides a metal support for intestinal canal anastomosis and anastomotic leakage, which relates to the technical field of medical instruments and comprises a metal support, a drainage tube and a support release device, the metal support is arranged in the support release device before being released, and the metal support is dumbbell-shaped after being released and comprises a first raised section, a second raised section and a groove section, the groove section is a double-layer metal net and comprises an inner-layer metal net and an outer-layer metal net, a space is formed between the inner-layer metal net and the outer-layer metal net, the inner face and the outer face of the metal support are both wrapped with silica gel coatings, a plurality of round holes communicated with the space are formed in the silica gel coating of the outer-layer metal net, the drainage tube is connected with the groove section, and the interior of the drainage tube is communicated with the space. After being released, the metal stent can block a digestive tract ventage or support liquid secreted by an anastomotic stoma, intestinal mucosa, blood vessels and ventage tissue, the liquid can enter the space between the two layers of metal stent nets through the round holes in the silica gel coating of the outer-layer metal net and is sucked out by negative pressure, cleanliness of the anastomotic stoma and the ventage can be kept, and healing of the anastomotic stoma and the ventage is promoted.

A blood collection system configured to be connected to a set of tubes providing vascular access to a patient, wherein the system has an access device connected to the set of tubes, the access device having a blood collection tube holder and a non-patient needle at least partially located within the blood collection tube holder. A blood collection system further having a syringe, the syringe having a plunger rod, a stopper, and a distal interface, and a cap assembly that can be coupled to the distal interface of the syringe. The cap assembly has a cap body and a bidirectional valve, the bidirectional valve being in fluid communication with a discharge chamber formed within the cap body.

The application relates to the application of lycorine hydrochloride in the preparation of a medicine for inhibiting the proliferation of a neointimal in a blood vessel. Lycorine hydrochloride has the effect of inhibiting the proliferation of a neointimal in a blood vessel, and the effect is mainly realized by inhibiting the proliferation and migration of vascular smooth muscle cells. In the body, the results show that lycorine hydrochloride can significantly inhibit the intimal proliferation caused by left common carotid artery ligation, and in vitro experiments prove that lycorine hydrochloride can intervene in the proliferation, migration and phenotype transformation of VSMCs induced by PDGF-BB. Lycorine hydrochloride inhibits the proliferation, migration and phenotype transformation of VSMCs induced by PDGF-BB, and the proliferation of a neointimal in a blood vessel through a MAPKs signal path. The application provides data for preparing lycorine hydrochloride into a medicine for inhibiting the proliferation of a neointimal in a blood vessel, and is expected to be applied to the prevention and treatment of complications after percutaneous coronary intervention, such as restenosis or in-stent thrombosis, and can become a potential medicine for intervening in restenosis.

A TIPS (Transient Invasive Stent) for flow restriction includes a bare stent with a fixed stent connected to one side. A flow-restricting stent is disposed inside the fixed stent. The flow-restricting stent has a conical structure, with the larger end of the conical stent connected to the inner side of the fixed stent, and the smaller end of the conical stent facing the other end of the fixed stent. A drug-eluting layer is disposed inside the fixed stent. In this application, the flow-restricting stent is a streamlined cone shape with a diameter that gradually decreases from one end to the other. This conical design reduces blood flow turbulence and recirculation, lowers the risk of thrombosis, maintains high stent patency, and more rationally balances the relationship between portal hypertension and hepatic encephalopathy, thus improving patients' quality of life. In some patients, it can more stably maintain the postoperative portal vein pressure gradient within the safe range of 10-12 mmHg. The conical structure achieves a smooth pressure gradient change through a gradually decreasing diameter, which is more in line with the principles of fluid dynamics and has high clinical value in preventing hepatic encephalopathy.

The application discloses an intraoperative stent, which comprises a main stent, an artificial blood vessel, an inlay, and a patching piece. The main stent is provided with a groove on the outer circumferential surface. The artificial blood vessel is connected with the proximal end of the main stent. The inlay is at least partially accommodated in the main stent. The inlay is provided with an inlay channel which is communicated with the groove. The inlay channel is used for cooperating with an implanted external branch stent. The patching piece is at least partially fixed opposite to the outer circumferential surface of the main stent. The patching piece is located on the adjacent side of the groove along the circumferential direction of the main stent. The patching piece has a preset length along the axial direction and the circumferential direction of the main stent. When a cut is arranged on the autologous blood vessel opposite to the groove, the autologous blood vessel at the cut can be sutured with the patching piece, so as to close the cut on the autologous blood vessel and relatively fix the intraoperative stent and the autologous blood vessel. The intraoperative stent solves the problems of branch over-selection and branch stent release positioning when the inlay branch is used to reconstruct the brachiocephalic trunk and the left common carotid branch.

The application discloses an intraoperative stent, which comprises a main stent, an artificial blood vessel, a first outer convex stent and an inner embedding body.

The application discloses a peripheral biodegradable vascular stent with a partitioned reinforced structure, which is divided into at least one double-layer reinforced area and at least one single-layer flexible area along the axial direction; the double-layer reinforced area comprises an inner-layer tube stent and an outer-layer tube stent which are coaxially sleeved, and the tube walls of the inner-layer tube stent and the outer-layer tube stent are in a hollow mesh structure; the peripheral wall of the inner-layer tube stent is provided with a plurality of radially extending connecting holes, and the inner peripheral wall of the outer-layer tube stent is provided with a plurality of radially extending connecting columns which are in one-to-one correspondence with the connecting holes and are embeddedly connected; the single-layer flexible area is in a single-layer mesh structure and has the same configuration as the outer-layer tube stent; and a smooth gradient transition structure is arranged between the double-layer reinforced area and the single-layer flexible area. The application solves the problems of excessive reinforcement, sacrifice of flexibility, insufficient absolute supporting force of a single-layer structure and failure caused by different degradation steps of a multi-layer structure.

The invention relates to the technical field of medical instruments, in particular to an airway stent for airway stenosis treatment, which comprises an end stent, the end stent is composed of an outer tube body, a conical body and an inner tube body which are coaxially distributed, the outer side ring surface of the outer tube body is fixedly connected with the inner wall of a narrowed port of the conical body, and the inner tube body is arranged on the inner side ring surface of the outer tube body. By means of the optimized design of the connecting mechanism, the end support and the valve support are effectively connected, self-adaptive contraction of the valve support can be achieved, the valve support can be matched with the inner membrane mechanism, the dynamic change of an air channel is coped, the self shape and the supporting force are effectively adjusted, the valve support is tightly attached to the wall of the air channel all the time, stable supporting is provided, and the service life of the valve support is prolonged. Support displacement or insufficient support caused by diameter change of the airway is prevented; and through mutual combination of the limiting assembly and the rotary flow distribution assembly, the limiting function during dynamic adjustment is achieved, a flushing agent can be conveniently injected into the support, and granulation is prevented from growing through meshes of the support.

A prosthetic heart valve includes a collapsible stent and a valve assembly disposed within the stent. A first cuff is disposed adjacent the stent. A second cuff having a distal edge facing the outflow end of the stent is disposed about the stent radially outward of the first cuff and the stent. The stent may include a plurality of fingers each having a first end coupled to a corresponding cell of the stent and a free end adapted to extend radially outward of the corresponding cell. The distal edge of the second cuff may be coupled to the fingers at spaced locations around the circumference of the stent to position the distal edge radially outward from the corresponding cells at the spaced locations. Various stent struts may be tapered to reduce the stent circumference in the collapsed condition, and to improve the fatigue resistance and / or bendability of the stent.

A prosthetic heart valve (300) may include leaflets (362) disposed within a stent (350), a flange (380), and anchor arms (370) coupled to the stent. The stent may have collapsed and expanded conditions and inflow (310) and outflow (312) ends. The flange may include a plurality of braided wires and may be coupled to the stent and may be positioned adjacent the inflow end of the stent. Each anchor arm may have a first end (370a) coupled to the stent adjacent the outflow end of the stent, a second end (370b) coupled to the stent adjacent the outflow end of the stent, and center portions (370c, 370d) extending from the first and second ends toward the inflow end of the stent. The center portions may be joined together to form a tip (370e) pointing toward the inflow end of the stent in the expanded condition of the stent.

This disclosure relates to an artificial heart valve for replacing a natural heart valve, comprising: an annular stent including: a mesh structure serving as a circumferential sidewall of the stent; and a leaflet structure, each leaflet being attached to the stent and having a first portion disposed within the stent and a second portion rolled up to the proximal peripheral side of the stent. As the heart grows, the stent can be expanded after the artificial heart valve is anchored to the heart, thereby allowing the artificial heart valve to function in different states without replacement. The edge end of the second portion of each leaflet is connected to the stent at a location between the distal and proximal ends of the stent, but not fixed to the proximal end of the stent. In at least one state, the size of each leaflet exceeds the fit size of the stent in that state, and each leaflet has a redundant portion that hangs freely from the distal to the proximal end to a location away from the stent, thereby allowing the leaflet to be sized away from the stent to form a more functional valve.

The present application relates to a kind of artificial heart valve stents and artificial heart valve.The artificial heart valve stent includes inner support and outer support.Inclination from inflow end to outflow end, first portion and second portion are included in sequence in inner support, the radial dimension of first portion is greater than the radial dimension of second portion, at least a portion of second portion is nested in outer support, and at least a portion of first portion extends to inflow end relative to outer support, and the portion of first portion extending to inflow end relative to outer support covers flow blocking film.The artificial heart valve includes the artificial heart valve stent and artificial valve leaflet fixedly connected in inner support.The artificial heart valve stent and artificial heart valve can reduce the risk of paravalvular leakage while being stably positioned in heart.

The invention discloses a blood flow guiding device auxiliary adherence instrument which comprises a first connecting part, a second connecting part and a supporting part, and a cavity is formed in the middle of the supporting part and used for containing the first connecting part and the second connecting part; the core wire is arranged on one side of the supporting component so as to drive the supporting component to extend into the blood vessel; the adjusting part is arranged on the second connecting part, and the adjusting part is used for adjusting the bending rate of the second connecting part. The size and the shape of a circle of the second connecting part are adjusted by adjusting the tightening degree of a second adjusting wire in the adjusting part, when the multiple strands of soft springs of the second connecting part form the circle, acting force is generated on the support, and the acting force is even and soft. The multi-strand soft spring of the circular second connecting part can be in full contact with the inner wall of the support and conduct circular motion in the support, and comprehensive and careful massage is conducted on the inner wall of the support.

A prosthetic heart valve may include an expandable stent having a plurality of struts forming cells connected to one another in a plurality of annular rows around the stent, a cuff attached to an annulus section of the stent by cuff sutures that have a plurality of stitches extending through material of the cuff and looping around the struts, and a plurality of leaflets each having a belly attached to the cuff within an interior region of the stent. The leaflets may together have a coapted position occluding the interior region of the stent and an open position in which the interior region is not occluded. The belly of each leaflet may be attached to the cuff by leaflet sutures extending in a path that crosses some of the struts in overlap zones. Those struts may be devoid of the stitches within the overlap zones.

This invention discloses a highly flexible appendiceal stent, comprising a proximal anchoring section, a middle flexible section, and a stent body. The outer wall of the stent body is provided with one or more anti-displacement rings. The stent is composed of multiple layers; preferably, the outer layer material of a three-layer stent is one or more combinations of polyurethane, modified nylon Pebax, and nylon. The outer layer materials of the stent body and the flexible section are more flexible than the proximal outer layer material. The middle imaging-enhancing layer is a spring mesh or braided mesh made of metal wires; the inner layer is a super-slippery polytetrafluoroethylene film. Compared to currently used appendiceal stents released via digestive endoscopy, the stent body of this invention is more flexible, causing less damage to the appendix. The stent with the flexible section is less prone to bending and provides smooth drainage. Furthermore, the appendiceal stent of this invention shows good imaging under X-rays, facilitating surgery. The anti-displacement rings and barbs placed in the stent body reduce the risk of displacement.

The invention provides a covered stent with a photo-thermal treatment function and a preparation method of the covered stent, and belongs to the technical field of medical instruments. The covered stent comprises a stent skeleton, a developing ring embedded in the stent skeleton and a photo-thermal conversion functional composite membrane, the composite film with the photo-thermal conversion function is of a three-layer sandwich structure and sequentially comprises an inner covering film, a middle functional layer and an outer covering film from inside to outside. And a stent inner cavity for contents to pass through is defined by the inner covering film. According to the invention, the platinum nanoparticles are adopted as the photo-thermal conversion material to prepare the photo-thermal treatment covered stent for the first time, and the stent has good photo-thermal conversion efficiency, so that the problems of loss of the photo-thermal material and limited load capacity of the photo-thermal material of the stent are solved, and accurate and controllable load of the photo-thermal material of the stent is realized.