37 results about "Self-expanding stent" patented technology

An improved stent delivery device configured to have radiopaque characteristics without sacrificing the structural integrity or functionality of the device itself is disclosed. In at least one embodiment, the stent delivery device provides a plurality of individual strands woven together to form a self-expanding stent delivery structure having a proximal end and an opposite distal end, the delivery structure forming an elongate initial shape for insertion of a catheter. At least one radiopaque marker is coaxially disposed within and secured to the circumferentially inner surface of the delivery structure. Thus, the delivery structure has an initial outer diameter that is substantially uniform along the entire length of the delivery structure.

An implantable medical device comprising an elongated body having a first end, a second end, and a lumen extending therebetween, a saddle region defined between the first end and the second end, a retention member at the first end, the second end, or both, wherein the retention member extends substantially traverse to a longitudinal axis of the implantable medical device and is configured to deform responsive to an application of a force along a longitudinal axis of the implantable medical device.

A stent delivery system is adapted to deliver and release a self-expanding stent with improved force transfer efficiency and reduced energy loss. The stent delivery system includes an inner member including a stent receiving region; a proximal member comprising a buckling reducing member adapted to reduce collapsibility within the proximal member; and a deployment sheath extending coaxially around the inner member and the proximal member and movable between a position in which the deployment sheath constrains the self-expanding stent and a position in which the deployment sheath does not constrain the self-expanding stent, the deployment sheath includes a stretch reducing member adapted to reduce stretchability within the deployment sheath, wherein the reduced collapsibility of the proximal member and the reduced stretchability of the deployment sheath together reduce energy loss within the stent delivery system.

The present disclosure relates generally to the field of medical devices. In particular, the present disclosure relates to devices and methods for controlled delivery of a stent, such as a self-expanding stent, and more particularly for controlling the full deployment of a stent in incremental steps from a sheath and for controlling the reconstrainment of a stent in incremental steps within a sheath.

The present disclosure relates generally to the field of medical devices and medical device delivery. In particular, the present disclosure relates to medical devices, systems, and methods for delivering a barrier device within a body lumen of a patient, such as the GI tract. For example, a barrier device may include a distal self-expanding stent. A tubular barrier may have a proximal end, a distal end, and a lumen extending therethrough. The distal stent may be disposed at the distal end of the tubular barrier. An anchoring self-expanding stent may be disposed at the proximal end of the tubular barrier.

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.

The invention discloses a covered stent for pancreatic-intestinal anastomosis and a manufacturing method of the covered stent. The covered stent comprises a self-expanding stent body which is columnar after being expanded, one end of the self-expanding stent body is a stent pancreas end, a stent jejunum end which protrudes outwards after being expanded is arranged at the position, close to the end, of the other end of the self-expanding stent body, and a membranous material layer for preventing pancreatic juice from leaking is arranged on the surface of the self-expanding stent body; the side, close to the pancreatic end of the stent, of the self-expansion stent body is provided with an annular piece. By adopting the covered stent, the contact stability of the self-expansion stent body and the inner wall of the pancreatic duct can be improved, the use stability of the covered stent is improved, and the pancreatic fistula risk is reduced.

In exemplary examples, methods and systems for treating vascular disease by implanting a stent within the vasculature and using intravascular imaging to determine and ensure that the stent was property implanted and producing a desirable and effective results is disclosed herein. For example, a system may obtain optical shape sensing data and intravascular imaging data for a blood vessel. The system may process the optical shape sensing data and the intravascular imaging data to generate a three-dimensional model and image of the blood vessel immediately before and immediately after stent implantation into the blood vessel, and perform a precise comparison of the before and after images to ensure that the stent was properly implanted and will produce or is producing a desirable and effective result. The precise comparison may be based on a derived diameter associated with the location at which the stent is placed in the blood vessel based on the generated pre and post generated three-dimensional models.

The present application belongs to the field of medical device technology, and specifically relates to an endoscope, a cooling assembly and a method of using the same. The cooling assembly is applied to medical devices and can cool a self-expanding stent, including a base and a cooling tube, the cooling tube is passed through the base, the side wall of the cooling tube includes a first spray portion, the first spray portion is provided with a plurality of first spray holes spaced along the circumference of the cooling tube, and the cooling tube has a first state; when the cooling tube is in the first state, the distal end of the cooling tube is in a closed state, the first spray portion is located on the distal side of the distal end surface of the base and on the proximal side of the closure of the cooling tube, and the first spray portion can extend into the self-expanding stent. The present application can help remove the self-expanding stent from the fistula, and help reduce the risk of damage to the fistula wall during the removal of the self-expanding stent.

A self-expanding stent configured to shift between a delivery configuration and a deployed configuration, the self-expanding stent including a tubular body having a proximal end and a distal end. In embodiments, the tubular body of the self-expanding stent defines a proximal flange, a distal flange, and a saddle portion extending from the proximal flange to the distal flange. The proximal flange and / or the distal flange may include an open-cell foam material affixed adjacent to or within the proximal flange and / or the distal flange to promote tissue ingrowth therein. Additional flanges, flange orientations, materials, and disposition of materials for a self-expanding stent are also contemplated.

An improved stent delivery device is configured to have radiopaque characteristics without sacrificing the structural integrity or functionality of the device itself. In at least one embodiment, the stent delivery device provides a plurality of individual strands that are woven together to form a self-expanding stent delivery structure having a proximal end and an opposing distal end, the delivery structure forming an elongated initial shape capable of being inserted into a catheter. At least one radiopaque marker is coaxially disposed within and secured to a circumferential inner surface of the delivery structure. Thus, the delivery structure has an initial outer diameter that is substantially uniform along the entire length of the delivery structure.

A stent comprises a framework that includes a sequence of cells that each occupy a discrete segment of the stent length, and each of the cells includes a plurality of struts with ends connected at respective vertices. In some forms the hollow cylindrical shape of the framework is moveable among a loading diameter that is smaller than a tube diameter, which is smaller than an expanded diameter, and every strut of the framework is oriented parallel to the stent axis when the hollow cylindrical shape is at the tube diameter. In other forms the framework includes T-bars that connect adjacent cells, where the T-bars have a column that has a minimum width perpendicular to the long axis that is wider than a maximum width of each of the struts, and the column defines at least one slot. In still other forms, the framework exhibits geometries that facilitate a high packing density for the framework when the stent is in a compressed tube or loading configuration.

The invention relates to a self-expansion stent system for a bifurcated blood vessel, the bifurcated blood vessel comprises a lesion blood vessel and a non-lesion blood vessel communicated with the lesion blood vessel, the self-expansion stent system comprises an outer layer sheathing canal, a release tube, an inner tube, a self-expansion stent, a positioning guide wire and a guide guide wire, the release tube is sleeved with the outer layer sheathing canal, and the outer layer sheathing canal is sleeved with the inner tube; the release tube is sleeved outside the inner tube, the self-expansion stent is releasably accommodated between the release tube and the far-end part of the inner tube, the guide wire and the inner tube are in sliding fit along the axial direction and extend into a lesion blood vessel, the positioning guide wire extends into a non-lesion blood vessel, a fixing piece is arranged at the far-end part of the outer sheath tube, and the self-expansion stent is fixed on the outer sheath tube. The fixing part is in sliding fit with the positioning guide wire, so that an included angle is formed between the positioning guide wire and the release tube, the stent can be accurately positioned and released to a required position, the influence of the positioning guide wire on the pressing and holding effect and the wall adhesion of the stent is avoided, and the displacement of the released stent due to withdrawing of the positioning guide wire is prevented.

An implantable endoluminal prosthesis for replacing a damaged aortic valve is provided. In one embodiment, the prosthesis includes a balloon-expandable stent, a tubular conduit that extends into the ascending aorta, and a self-expanding stent. The tubular conduit extends across the balloon-expandable stent. The tubular conduit includes an artificial valve. The self-expanding stent extends across the tubular conduit into the ascending aorta. The balloon-expandable stent, the tubular conduit, and the self-expanding stent are coupled to provide unidirectional flow of fluid into the aorta and further into the coronary arteries. Also provided is a method for implanting the endoluminal prosthesis.

A stent delivery catheter assembly for delivering and implanting a self-expanding stent in a body lumen includes a handle assembly for one handed use. The handle assembly has a mode selection for advancing, reversing and locking the stent delivery components. Rotation of a thumbwheel allows the physician to deploy and implant the self-expanding stent in the body lumen with control and precision by simultaneously pulling a sheath proximally and pushing a pusher member distally.

The invention relates to a self-expandable stent, especially a pulmonary stent, with a proximal section, a middle section and a distal section arranged at a longitudinal axis of the stent, the stent having a dry valve made of bovine pericardium arranged at the middle section thereof, a skirt surrounding the dry valve at least at the middle section and made of one of bovine pericardium and polyester, wherein the stent further comprises eyelets arranged at a distal end at the distal section and / or a proximal end at the proximal section for fixing the stent at an artery, and wherein the stent comprises a frame composed of a plurality of arms forming the proximal, the middle and the distal section with the sections being interconnected, and the stent comprising a fixture area at the middle section of the frame with the arms being arranged in parallel to each other at the fixture area and the middle section comprising one or more fixture openings at said fixture area for fixing the valve at the frame. The invention further relates to A delivery device for delivering a self-expandable stent according to claims 1 to 14, the delivery device comprising a flush port, a main body part for holding, inflating and / or releasing the stent, and an actuation mechanism for moving the stent to a delivery site, and / or wherein the actuation mechanism has a torque control and can rotate the stent about an axis of the main body, and / or the delivery device having a knob or the like at the actuation mechanism, with the knob in particular being able to be rotated about an axis of rotation of the actuation mechanism.

A stent comprises a framework that includes a sequence of cells that each occupy a discrete segment of the stent length, and each of the cells includes a plurality of struts with ends connected at respective vertices. An adjacent pair of the cells are attached to one another by a plurality of T-bars that each include a column defining a long axis that extends parallel to the stent axis, and a top bar attached to one end of the column. An opposite end of the column is attached to a first cell, and the top bar is attached at opposite ends to a second cell of the adjacent pair of cells. The top bar includes a curved edge on an opposite side from the column, and the curved edge straddles the long axis.

A vascular implant for replacing a native heart valve comprises a self expanding stent supporting a valve body having leaflets. The stent preferably comprises an anchoring structure configured to prevent the implant from passing through the valve annulus. For delivery, the implant is compacted within delivery device and secured at one end. During delivery the implant is partially released from the delivery device, and positioning of the implant can be verified prior to full release. The implant can be at least partially resheathed and repositioned if desired.

Devices and methods for deploying an anastomotic stent between portions of the gastro-intestinal (GI) tract are disclosed. The anastomotic stents are configured to atraumatically engage the tissue walls and to permit the flow of fluid, partially digested food, and food. The stents can be deployed using endoscopic catheter devices, laparoscopic tools, and combinations of both endoscopic tools and laparoscopic tools. Examples of anastomoses include anastomoses between the stomach and a portion of the intestines such as the jejunum. Anastomoses can also be formed between two closed ends of the intestines, such as two closed ends of the colon formed during a colon resection procedure. Anastomoses can also be formed between a fundal pouch formed during a gastric bypass procedure and the jejunum. Laparoscopic tools are disclosed to deploy a stent by selectively removing a radial restraint on a self expanding stent with the restraint removed through the laparoscopic access points.

The invention provides stent preparation equipment and a stent preparation method. The support preparation equipment comprises a bearing frame; the knitting tool is rotatably arranged on the bearing frame and can rotate in the first direction, and a plurality of positioning protrusions arranged according to a preset mode are arranged on the peripheral face of the knitting tool; the feeding mechanism is movably arranged on the bearing frame and comprises a feeding pipe, the feeding pipe can move in the second direction, the first direction and the second direction are parallel, the interior of the feeding pipe is used for raw material wires to pass through, and the bottom end of the feeding pipe is used for stretching into the positioning protrusions; during weaving, the raw material yarn is in a tensioned state, one end of the raw material yarn is connected with the discharging equipment, the other end of the raw material yarn penetrates through the feeding pipe and then is fixed to the weaving tool, and while the weaving tool rotates, the feeding pipe moves and pulls the raw material yarn to be attached to the outer circumferential face of the weaving tool to bypass the positioning protrusions. And then the self-expanding stent with the preset shape and size is prepared, and the consistency and stability of the stent are good.

Described herein are radially self-expanding stents. The disclosed stents can be used to widen arteries and / or veins of a patient to counteract or combat narrowing of the arteries and / or veins associated with certain congenital diseases, such as aortic coarctation. As an example, the disclosed stents are configured to be placed at or near a narrowed portion of the aorta where the stent produces a radial outward force on the aorta. The radial force produced by the stent widens the aorta and causes the stent to expand with the aorta. The disclosed stents can be crimped to relatively small sizes for placement in small patients (e.g., less than about 10 kg in size) and can be configured to expand to widen the aorta and to accommodate growth in the patient.

A stent comprises a framework that includes a sequence of cells that each occupy a discrete segment of the stent length, and each of the cells includes a plurality of struts with ends connected at respective vertices. An adjacent pair of the cells are attached to one another by a plurality of T-bars that each include a column defining a long axis that extends parallel to the stent axis, and a top bar attached to one end of the column. An opposite end of the column is attached to a first cell, and the top bar is attached at opposite ends to a second cell of the adjacent pair of cells. The column has a minimum width perpendicular to the long axis that is wider than a maximum width of each of the struts, and the column defines at least one slot. The top bar includes a curved edge on an opposite side from the column, and the curved edge straddles the long axis.

An expandable frame assembly for cable-driven mechanism steering that includes a plurality of steering cables, a catheter, a self-expanding frame, and a guiding sheath. The plurality of steering cables each extends from a control unit at a proximal end to an end-effector at a distal end. The self-expandable frame is proximate the distal end of the plurality of steering cables and includes: a self-expandable support having a tubular base through which the catheter extends and a framework portion that surrounds the catheter; and a plurality of curved branch tubes equivalent to the number of steering cables, each one of the plurality of curved branch tubes attached to the tubular base of the self-expandable support, wherein each one of the plurality of curved branch tubes serves as an anchor and includes an internal passage for one of the plurality of steering cables to extend through.

The utility model discloses a stent imbedding device, which is suitable for imbedding a self-expanding stent and comprises a shell, a stent carrier, a guide tube, a stent binding rope and an operation pressing handle component, and the stent carrier is mounted in the shell; the guide pipe is arranged outside the bracket carrier in a sliding manner; the stent binding rope is suitable for restraining and fixing the self-expanding stent on the stent carrier, and a release line connected with the guide tube is arranged on the stent binding rope; one end of the operation pressing handle assembly is hinged to the shell, the other end of the operation pressing handle assembly is hinged to the guide pipe, and the operation pressing handle assembly is suitable for being pressed and driving the guide pipe to move in the shell so as to pull the release line of the connected stent binding rope and release the self-expanding stent on the stent carrier extending out of the guide pipe. The self-expanding stent can be protected when the self-expanding stent goes deep into the focus of a human body, accidental release of the self-expanding stent is avoided, and operation is more convenient.

The present disclosure provides medical devices such as self-expanding stents or tissue lumen stents with an overlapping layer. The medical devices can have a coating or cover disposed over all or a portion of the medical device. The overlapping layer define a doubled back portion at an end of the medical device that includes an elongate section to provide dynamic movement of the end of the medical device relative to a central portion of the medical device.

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.

A stent delivery system includes a delivery sheath having a distal expandable region, and an elongate shaft disposed within the sheath, the shaft including a dilation balloon at its distal end. The expandable region is configured to constrain a self-expanding stent in a collapsed configuration. The balloon is configured to shift the stent to an expanded configuration within the distal expandable region. A method of delivering a self-expanding stent includes positioning the stent delivery system at a target site, inflating the balloon within the expandable region, retracting the sheath with the balloon in an inflated configuration to move the stent out of the expandable region, and thereafter, deflating the balloon to release the stent. A stent delivery system includes a delivery sheath configured to receive a stent in a collapsed configuration, and a balloon disposed within the sheath. The balloon is configured to advance the stent out of the sheath.

An implantable medical device comprising an elongated body having a first end, a second end, and a lumen extending therebetween, a saddle region defined between the first end and the second end, a retention member at the first end, the second end, or both, wherein the retention member extends substantially traverse to a longitudinal axis of the implantable medical device and is configured to deform responsive to an application of a force along a longitudinal axis of the implantable medical device.

To provide a method, apparatus, and kit for assisting in the expansion of a self-expanding stent, especially within highly curved or tortuous blood vessels.SOLUTION: An elongated pusher 112 having an expandable distal mesh portion can be positioned within a self-expanding stent, expanding during delivery to provide extra expansion force to the stent to ensure the stent properly expands.SELECTED DRAWING: Figure 3

The present application belongs to the field of medical device technology, and specifically relates to a cooling assembly and an endoscope. The cooling assembly includes a base and a cooling tube, the cooling tube is arranged through the base, and the side wall of the cooling tube includes a first spray part, and the first spray part is provided with a plurality of first spray holes spaced along the circumference of the cooling tube; the cooling tube has a first position, and when the cooling tube is in the first position, the first spray part is located at the far side of the distal end surface of the base, and the first spray part can extend into the self-expanding stent; the cooling tube also includes a closable part, which is located at the far side of the first spray part, and the closable part can switch between a closed state and an open state, and when the closable part is in a closed state, the closable part is cut off; when the closable part is in an open state, the closable part is turned on. The present application can help to remove the self-expanding stent from the fistula, and help to reduce the risk of damage to the fistula wall during the removal of the self-expanding stent.