105 results about "Self expandable" patented technology

The invention discloses a drug eluting stent, which comprises a stent main body and a plurality of thorn-shaped components, the stent main body has a radially compressible contraction state and a radially self-expanding expansion state to support blood vessels, and the plurality of thorn-shaped components are arranged on the outer surface of the stent main body and coated with a drug coating for inhibiting vascular restenosis. The spine-shaped components are arranged on the stent body and are configured to protrude towards the outer side of the stent body from the outer surface of the stent body to penetrate into calcified lesions on the inner wall of a blood vessel when the stent body is switched from the contraction state to the expansion state, each spine-shaped component is provided with a part capable of generating elastic deformation, and the spine-shaped components are configured to be capable of generating deformation in a self-adaptive mode according to the thickness of the contacted calcified lesions. Therefore, the medicine can be uniformly distributed in a target lesion area, and the utilization rate of the medicine and the treatment effect are remarkably improved.

An endoluminal prosthesis including a stent-graft formed of a stent and a base graft. The stent-graft is expandable in a radial direction of the endoluminal prosthesis and exhibits a self-expansion force in the radial direction such that the stent-graft is self-expanding in the radial direction from a compacted condition to a self-expanded condition. The endoluminal prosthesis further includes a radially restraining sleeve member having first and second ends and a middle portion, where each of the first and second ends are fixedly coupled to the stent-graft through a heat application process. The radially restraining sleeve member is adjustable to an adjusted diameter in the radial direction in a range of diameters between the self-expanded condition of the stent-graft and the maximum expanded condition of the stent graft through the application of an external force.

Some embodiments of percutaneous ventricular assist devices have an expandable pump impeller and an associated flexible drive shaft. The drive shaft can be coupled to a motor located external to the patient. The motor can rotate the drive shaft to spin the pump impeller inside of the pump housing, causing blood to be pumped within the patient. In some embodiments, the pump impeller is inflatable and / or self-expandable. The percutaneous ventricular assist devices with inflatable or self-expandable pump impellers are designed to have very small delivery profiles. Accordingly, various deployment modalities, including radial artery deployment, are practicable using the two-part percutaneous ventricular assist devices described herein.

The invention discloses a drug eluting stent, which comprises a stent main body and a plurality of thorn-shaped components, the stent main body has a radially compressible contraction state and a radially self-expanding expansion state to support blood vessels, and the plurality of thorn-shaped components are arranged on the outer surface of the stent main body and coated with a drug coating for inhibiting vascular restenosis. The spine-shaped components protrude from the outer surface of the stent body to the outer side of the stent body so as to penetrate into calcification lesions on the inner wall of a blood vessel when the stent body is switched from the contraction state to the expansion state, each spine-shaped component comprises a spine section, and the spine section at least comprises a first section and a second section of which the roots are connected together. The first section and the second section are attached to each other in a natural state to form a compact structure, and can elastically deform and be separated relative to the root part when subjected to opposite acting force from calcification lesion, so that the calcification lesion can be punctured at a larger angle, the slippage risk is reduced, the puncturing efficiency is improved, and the puncturing effect is improved. Therefore, the effect of inhibiting vascular restenosis is enhanced.

Some embodiments of the invention advantageously leverage the expansion, dilation or by-pass of the Schlemm's canal using adjustable reversible self-expanding eye stents (SES) or eye tension rings (ETRs) of desired sizes to control and improve aqueous flow throughout the range of the uveolymphatic canal. As such, some embodiments include tension ring(s) or cylinders that sits either inside or outside the Schlemm's canal wall and is at least partially within the canal and / or is partially or fully anchored, attached, adhered, or otherwise held in place with respect to the wall and / or elsewhere in the canal. The partial or complete expansion of the canal can be pre-configured based on pre-operative metrology of the Schlemm's canal to a customized and adjustable fit across the various zones within the uveolymphatic canal and based on the patient specific and evolving needs. Additionally, the SES can utilize entry / exit features for by-pass of fluid, varying control of dilation across its shape that may also allow anchoring, repositioning, and retrieval.

A valve prosthesis includes a self-expanding frame and a prosthetic valve coupled to an interior of the frame. The frame includes a plurality of endcrowns at a first end thereof, and a first paddle connected to a first endcrown by a first stem. The first end of the frame is collapsible to a collapsed configuration when a restraining force is applied to the first paddle and to the endcrowns, is configured to expand from the collapsed configuration to a partially deployed configuration when the restraining force is removed from the endcrowns but is still applied to the first paddle, and is configured to expand to a fully deployed configuration when the restraining force is removed from the endcrowns and from the first paddle. A first vale of a lateral dimension of the first end in the partially deployed configuration is at least 70 percent of a second value of the lateral dimension of the first end in the fully deployed configuration.

Systems for replacing the function of a native atrioventricular valve are described. The systems can include a prosthetic heart valve including a self-expanding frame and a plurality of leaflets. The systems can include a delivery catheter having an elongate shaft for advancing the prosthetic heart valve through a patient's vasculature to the native atrioventricular valve, the elongate shaft including a capsule along a distal end portion of the elongate shaft for maintaining the prosthetic heart valve in a compressed state. A tether assembly can extend through the elongate shaft of the delivery catheter and can include loop portions. A release assembly can include a plurality of flexible release tethers that are retractable for removal from the loop portions and thereby allowing the tether assembly to be released from the prosthetic heart valve.

A delivery system for transcatheter implantation of a heart valve prosthesis. The delivery system includes an outer sheath component defining a lumen therethrough, an elongate tube having at least two flat wires longitudinally extending from a distal end thereof, and self-expanding first and second frames disposed in series within a distal portion of the outer sheath component and held in a compressed delivery configuration therein. The elongate tube and the at least two flat wires are slidably disposed within the lumen of the outer sheath component. In the compressed delivery configuration the at least two flat wires longitudinally extend along exterior portions of the first and second frames and are woven through adjacent ends of the first and second frames to releasably couple them to each other. Proximal retraction of the at least two flat wires from the first and second frames releases at least the first frame from the delivery system.

The subject of the invention is a delivery system for delivering a self-expanding endoluminal prosthesis to the patient's ascending aorta and aortic valve, the system comprising: - an inner tube (33), extending along a longitudinal Y axis of the delivery system (100), from an atraumatic distal tip (27) to a handle (37); - a metal tube (32), slide-fitted on the inner tube (33), and extending from the internal space of the distal tip (27) to a handle (37); - an outer tubular catheter shaft (22) slide-fitted on the metal tube (32), the catheter shaft (22) is brought out from the handle (37) and is terminated by a capsule (20), containing inside the radially compressed on the metal tube (32), self-expanding endoluminal prosthesis (1) having defined construction and covered at least partially by a coating (16), - the capsule (20) has closed position when is closed by the tip (27) and has open position when the capsule (20) and the tip (27) are displaced relative to each other; wherein the distal part of the metal tube (32) is equipped with receiving means (41, 42) on which the distal locking means (7) of prosthesis (1) are removably embedded and blocked in the inner space of the tip (27) and the delivery system (100) comprises also removable holding means (45, 45') retaining the proximal locking means (9) of the prosthesis (1), so that when the capsule (20) is in its fully open position, the prosthesis (1) is still maintained partially compressed, holding its crimping length.

Implant (1) having the following features: a. an implant body (2) is expandable from a non-expanded state to an expanded state; b. the implant body (2) is self-expanding; c. it comprises a flexible tensioning means (8) which loops around the implant body (2) with at least one loop in order to hold the implant body (2) in the non-expanded state; d. the loop has a locking crown at one end which is in operative engagement with a locking body (15); e. the locking body (15) is displaceable relative to the locking crown in order to release the locking crown and the loop and in order to expand the implant body (2).

The application provides a controllable self-expanding intramedullary nail internal fixation system for long bone fracture, belonging to the technical field of orthopedic medical instruments, and comprising a self-expanding intramedullary nail, a visible controllable self-expanding platform and a locking nail; the self-expanding intramedullary nail comprises a locking hole and an expandable support; the locking hole is arranged at the proximal end of the self-expanding intramedullary nail and is matched with the locking nail to fix the proximal end of the self-expanding intramedullary nail; the expandable support is arranged at the distal end of the self-expanding intramedullary nail after expansion to fix the distal end of the self-expanding intramedullary nail. The visible controllable self-expanding platform is in communication with the expandable support and can display the expansion size, and the self-expanding intramedullary nail can be prevented from being expanded too large to affect the medullary cavity by precalculating the expansion size.

Provided is a stent with which it is possible to safely and easily perform appropriate expansion of a stenosed site.　A stent 10 comprises a self-expanding cylindrical part 11 that is used for expanding a stenosed site of a biological lumen. The cylindrical part 11 has a mesh pattern structure composed of a plurality of struts. The cylindrical part 11 includes a radiopaque coating layer formed over a range of the effective length VL thereof. The expansion force is different between a central portion 11a and opposite end portions 11b, 11c of the range of the effective length VL.

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.

Tubular braided implantable endovascular embolization device including a folded over tubular braid forming a folded over atraumatic distal surface and preformed into multiple distinct sections including: a stabilizing section; a sealing section; an intermediate section interposed between the sealing and stabilizing sections; and a proximal section. The stabilizing section and the sealing section are radially self-expanding to a maximum outer diameter larger than the intermediate section or the proximal section. Enhanced stiffness while obstructing open space regions maximizing disruption of blood flow therethrough is achieved by using a plurality of nested layers (at least one of which is the folded over tubular braid) to form the sealing section while the stabilizing section preferably formed by a single braided layer (i.e., the folded over tubular braid) optimizes compressibility and positioning.

An endovascular embolization system including a braided implantable device having: a tubular braid pre-formed as a default shape into multiple distinct sections including: an intermediate section interposed directly between a stabilizing section and a sealing section; the intermediate section having a stiffness greater than that of the stabilizing section; and a proximal section. Each of the stabilizing section and the sealing section are self-expanding between a radially expanded state when free from an externally applied radial force and a radially constricted state when subject to the externally applied radial force; each of the stabilizing section and the sealing section while in the radially expanded state have a maximum outer diameter larger than an outer diameter of each of the distal section, the intermediate section, and the proximal section.

The present disclosure relates to a stent for a TIPS surgery, including a first stent body and a second stent body. During use, the first stent body sleeves the second stent body, to control a self-expansion range of the second stent body. The first stent body includes first connectors, intermediate connectors, and second connectors. The second stent body is formed by weaving a single strand of memory alloy. The second stent body includes a first segment and a second segment which are connected. The first segment is of a woven spiral structure, and the second segment is of a woven self-locking structure. By arranging the first stent body to include the first connectors, the intermediate connectors, and the second connectors, the first stent body can shorten to a minimal extent in a length direction during expansion. Moreover, the design of the structure, combined with a stainless steel or cobalt-chromium alloy material, facilitates mechanical diameter control and prevents creep deformation within a long period under physiological conditions, thereby effectively improving the stability of the stent for the TIPS surgery.

Devices and methods for treatment of a patient's vasculature including occluding aneurysms and blood vessels are described. The device includes a self-expanding resilient permeable shell having a radially constrained state and an expanded state with an axially shortened configuration. The permeable shell may be a single layer of braided elongate filaments having first and second ends that are secured at the proximal end of the permeable shell. The devices may also include permeable shells made of woven braided mesh having a variable mesh density, i.e., the average size of pores in one region are a different than the average size of pores in another region. Devices and methods of using the device to treat a cerebral aneurysm are also described.

An assembly includes a holder device and a non-self-expandable prosthetic heart valve. The prosthetic heart valve can be radially compressed from an expanded configuration to a compressed configuration. The holder device is configured to hold the prosthetic heart valve in the expanded configuration and to allow the prosthetic heart valve to be inserted in a crimping device so that the prosthetic heart valve can be crimped onto a valve mounting portion of a delivery apparatus.

Disclosed are methods and devices for isolating all three of the left subclavian, left common carotid and brachiocephalic arteries from embolic debris that might flow through the aortic arch, via a single access point. A system may include an elongate flexible tubular sheath, having a proximal end and a distal end, and an inner member extending through the sheath and moveable relative to the sheath. A left subclavian element may be supported by the inner member. A filter membrane may be configured to isolate the aorta from the brachiocephalic, left common carotid and left subclavian arteries when the left subclavian element is expanded within the left subclavian artery and the sheath is retracted to expose the membrane. The left subclavian element may include a self expandable frame, which may carry a left subclavian filter.

Stoma interface devices and methods for manufacturing the same for total laryngectomy and select partial laryngectomy patients that fit directly into the tracheostoma where the devices provide a support which can interface with standardized tracheostoma components (e.g., speaking valves) and offer hands-free alternatives for tracheoesophageal (TE) speech production. Devices hereof comprise a body having a self-expanding frame coated in multi-durometer silicone elastomers to form a distal portion with a distal flange configured to engage the tracheostoma of the patient, and a proximal portion configured to interface with the tracheostoma components.

Vascular treatment devices and methods include a woven structure including a plurality of bulbs that may be self-expanding, a hypotube, for example including interspersed patterns of longitudinally spaced rows of kerfs, and a bonding zone between the woven structure and the hypotube. The woven structure may include patterns of radiopaque filaments measureable under x-ray. Structures may be heat treated to include various shapes at different temperatures. The woven structure may be deployable to implant in a vessel. A catheter may include a hypotube including interspersed patterns of longitudinally spaced rows of kerfs and optionally a balloon. Laser cutting systems may include fluid flow systems.

Methods for draining pseudocysts and stent delivery systems for use therein are disclosed. An illustrative system may include a catheter shaft having an inflatable balloon affixed to a distal end region thereof. A cutting electrode may be disposed at the distal end of the system and at least one heating electrode may be disposed within the inflatable balloon. A self expandable stent may be disposed about the inflatable balloon. The stent may be formed of a shape memory polymer. The inflation fluid may be heated within the balloon to facilitate expansion of the stent.

An occlusive medical implant for implantation within a left atrial appendage may include an expandable framework configured to self-expand from a collapsed configuration to an expanded configuration, and an occlusive element disposed on a proximal portion of the expandable framework. At least a portion of the expandable framework may be mechanically expandable from the expanded configuration to a securement configuration. When the occlusive medical implant is disposed within the left atrial appendage, the expandable framework exerts a first radial force on the left atrial appendage in the expanded configuration and the expandable framework exerts a second radial force on the left atrial appendage in the securement configuration. The second radial force is greater than the first radial force.

The application discloses a single-layer composite stent, relates to the field of medical devices, and discloses a single-layer composite stent which comprises a supporting main body and a woven wire mesh, wherein the supporting main body is a self-expanding net tube structure, and a plurality of through holes are arranged at intervals in the supporting main body; the woven wire mesh is arranged in the through holes and wound on the supporting main body; the composite stent can treat stenosis lesions in blood vessels through the supporting main body, and effectively prevent the shedding of plaques at the stenosis lesions through the woven wire; the wall thickness of the single-layer stent is adopted to realize the effect of a double-layer stent, the loss of a blood vessel cavity is minimized, the blood flow is fully ensured to be smooth, and the single-layer composite stent has remarkable clinical significance; the single-layer composite stent has good firmness and composite strength, and is not prone to delamination or even breakage and shedding after implantation, so that other complications are effectively avoided; meanwhile, the release resistance of the single-layer composite stent can be effectively reduced, and the single-layer composite stent is convenient for doctors to operate.

Self-expanding implants useful as vascular flow reducers are disclosed with minimized wall porosity configured to maximize the percentage of total vascular flow routed through the reduced orifice while maintaining an overall stable structure that avoids or minimizes distortions such as in-folding when the implant is compressed to a smaller diameter suitable for delivery through the vasculature to the treatment site.

The self-expanding occlusion device includes a hypotube. The outer diameter of the occlusion device self-expands or increases, and the occlusion device automatically assumes its final shape after deployment to the target location. The occlusion device can maintain its increased outer diameter and final shape while the occlusion device remains exposed to one or more conditions at the target location.

The utility model relates to the field of anorectal examination, in particular to a portable self-expansion electronic anorectal endoscopy device. Comprising an anal tube and an anal mirror, the anal tube comprises an inner tube, an air inflation bag and a grab handle, the inner tube is sleeved with the air inflation bag, the air inflation bag is inflated through an air inflation opening, the air inflation bag is deflated through an air deflation opening, and the grab handle is installed at the end, away from the insertion opening, of the inner tube; the diameter of the outer wall of the anoscope is the same as that of the inner wall of the inner tube, and the anoscope is slidably connected with the inner tube. According to the anal dilatation device, anal dilatation is carried out by inflating the inflatable cushion, so that the purpose of dilating the anus with high comfort is achieved.

Medical devices and methods for making and using medical devices are disclosed. An example medical device may include an access valve that may be retrieved after implantation. The access valve may include a frame having a lumen, a self-expandable member extending through the lumen, and an elastic membrane extending through the lumen and a second end of the frame to releasably seal the lumen. The access valve may releasably attach to a wall of a patient and releasably seal an opening through the wall. The access valve may be attached to the wall by placing the frame adjacent the wall, extending the self-expandable member through the opening in the wall, and expanding the self-expandable member such that the self-expandable member applies a first force against the wall and a second force opposite the first force against the frame to sandwich the wall between the self-expandable member and the frame.

The present disclosure provides a tissue lumen stent having an elongated tubular configuration and a shortened configuration in which an upstream end, a downstream end, or both the upstream end and the downstream end are radially expanded into a flanged and / or trumpet-shaped structure, while the region therebetween is typically cylindrical. The maximum lateral dimension, axial width, and / or axial radius of the upstream flange structure is greater than the maximum lateral dimension, axial width, and / or axial radius of the downstream flange structure, and may include a sloped portion having an axial length at least as long as the maximum diameter of the saddle region when the body is in the shortened configuration.

Embodiments described herein relate to a stent for vascular interventions. The stent may be used for jugular vein interventions. The stent addresses challenges inherent to the jugular vein by incorporating adaptability, sizing versatility, and a self-expanding mechanism. In some embodiments, the stent may include Nitinol for biocompatibility. In some embodiments, the stent includes a tapered body and may be configured to have a diameter corresponding to a diameter of a jugular vein of a patient. In some embodiments, the stent may include open-cell and / or closed-cell geometries. In some embodiments, the stent may include peak-to-valley (PTV) and helical bridge connections between cells.