3633results about "Blood vessels" patented technology

There is described a computer-implemented method for designing a stent, comprising: providing for display a first image of a 3D model of at least a portion of a body part comprising an aneurysm; receiving a position for each one of a plurality of reference points chosen along the body part; inserting in the first image a visual marker at the position of each reference point, thereby obtaining a second image; providing the second image for display; for each reference point, calculating a respective diameter; calculating at least one length using the positions of the reference points; and outputting the respective diameter and at least one length.

Devices are provided with an internal dimension that can be reduced and increased in vivo. In one example, an interatrial shunt for placement at an atrial septum of a patient's heart includes a body. The body includes first and second regions coupled in fluid communication by a neck region. The body includes a shape-memory material. The body defines a passageway through the neck region for blood to flow between a first atrium and a second atrium. The first and second regions are superelastic at body temperature, and the neck region is malleable at body temperature. A flow area of the passageway through the neck region may be adjusted in vivo.

The invention provides an instant-penetration expanded polytetrafluoroethylene artificial blood vessel and a preparation method thereof. The preparation method comprises the following steps: mixing PTFE dispersion resin and lubricating oil with a first compression ratio, and curing to obtain a first PTFE mixture; mixing the PTFE dispersion resin with a second compression ratio and lubricating oil, and curing to obtain a second PTFE mixture, wherein the first compression ratio is higher than the second compression ratio; the first PTFE mixture is pre-pressed into a middle layer cylinder; pre-pressing the second PTFE mixture into an inner-layer cylinder and an outer-layer cylinder; the middle-layer cylinder is put into the outer-layer cylinder, the inner-layer cylinder is put into the middle-layer cylinder to obtain a composite cylinder, and the composite cylinder is subjected to blank pressing treatment to obtain a secondary blank pressing cylinder; and carrying out one-way stretching on the secondary compaction cylinder to obtain the instant-penetration expanded polytetrafluoroethylene artificial blood vessel which is not layered after being punctured.

The invention discloses a windowing covered stent blood vessel and a delivery system, and belongs to the field of medical instruments, the windowing covered stent blood vessel comprises a covered stent blood vessel main body and a windowing assembly arranged on the covered stent blood vessel main body; wherein the windowing assembly at least comprises a barrel-shaped structural part and a connecting part, and the barrel-shaped structural part is provided with a channel matched with the branch support; the connecting piece is used for connecting the cylindrical structural piece and the covered stent blood vessel main body; the connecting piece is provided with a buffer part, so that the cylindrical structural piece is flexibly connected with the covered stent blood vessel main body; according to the windowing assembly, blocking of the branch support can be effectively avoided, and good wall attaching performance can be provided for the embedded branch support through the buffering part.

A steering device and navigation system for interventional procedures. Included are devices, systems, and methods that incorporate a steering device which consists of an expandable structure that can be controlled to spread out within the vessel lumen, or cardiac chamber, and may apply circumferential force to the tissue. This structure, once spread out, can anchor relative to the anatomy and provides support for an internal catheter through a set of strings connected to the internal catheter. The internal catheter is configured to allow an interventional device, such as a guidewire or catheter, to pass through it. Using the strings that are connected to actuation mechanisms within the device's handle, the internal catheter can be manipulated to allow controlling the position of a device that runs within it or is connected to it and can be used for the purpose of navigation of devices and obtaining measurements from known positions.

The invention relates to a covered stent, a stent system and a manufacturing method of the stent system.The covered stent comprises a main stent body, a covering film and binding wires, the main stent body comprises a main corrugated ring and a main covering film, the main corrugated ring is covered with the main covering film, the binding wires comprise the first binding wire, and the covering film and the main stent body are connected to one side of the main stent body through the first binding wire; the covered stent further comprises a first positioning piece and a second positioning piece, the first positioning piece is arranged at the proximal end of the main stent, the second positioning piece is arranged at the proximal end of the envelope, and when the covered stent is in a natural expansion state, when the envelope is naturally attached to the main stent in the circumferential direction, the envelope is located at the proximal end of the main stent. The first positioning piece and the second positioning piece are roughly located on the same radial line. According to the covered stent provided by the invention, a second fixed connection point of the envelope of the covered stent and the main stent can be determined, and the envelope is prevented from being fixed to the circumferential opposite side of the target position of the main stent, so that the problem of release of the proximal end of the main stent is avoided.

A surgical anchor device for being anchored on the mucous membrane of the inner wall of the intestine, the device having a temporary anchor element presenting anchoring that can be modified in a controlled manner and having a first substantially cylindrical multiply-perforated wall presenting properties of radial elasticity whereby the first wall presents an outer diameter that can be varied in controlled manner, wherein a portion of the inner surface of the first wall is lined with an independent leakproof inner sheath having only its longitudinal ends fastened to the anchor element to define a suction chamber between the inner sheath and the first wall, the temporary anchor element being coupled to a flexible or semi-rigid tube extending outside the anchor element, an open end of the injection-suction tube opening out into the suction chamber enabling air to be injected into or sucked out from the suction chamber.

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.

A device for treating a diseased native valve in a patient is provided, the device including a frame structure and a plurality of leaflets. The device can further include a spiral anchor configured to extend around an outer circumference of the frame structure. The anchor can be configured to deliver a contrast agent into or near a target tissue. Other embodiments and methods of use are also provided.

The invention relates to a covered stent and a stent system.The covered stent comprises a main stent body and a wrapping piece, the main stent body comprises a main corrugated ring and a main covering film, the main corrugated ring is covered with the main covering film, the wrapping piece is connected with the main stent body through a binding wire, the main stent body comprises a binding piece, and the binding piece is connected with the main stent body through a connecting wire. The binding piece comprises a part of the main body wave ring or comprises a binding line, the binding piece extends along the main body covering film, the main body covering film comprises a first through hole and a second through hole, and the first through hole and the second through hole are formed in the two sides of the extending direction of the binding piece respectively; and the binding wire passes through the first through hole and the second through hole and crosses the binding piece. The binding wire of the covered stent provided by the invention crosses the binding piece when penetrating through the main body covering film, when the covered stent is loaded or released, although the covering film and the main body covering film are pulled and stressed by the binding wire, the binding wire mainly pulls the binding piece, and when the binding wire is stressed, the possibility that film holes of the first through hole and the second through hole are expanded can be reduced, so that internal leakage is prevented.

A catheter system can include a tubular body, and at least one of a targeting system coupled to the tubular body, an expandable member, or a fluid injection port. A method of identifying a bifurcation can include inserting a catheter system into a first vessel, positioning the catheter system at a first location, expanding an expandable member to occlude the first vessel, delivering contrast material so the contrast material pooling proximate to the expandable member, and reviewing a shape of the contrast material in the first vessel under fluoroscopy.

Delivery systems for delivering an aortic repair device to treat a diseased portion of the aorta of a patient at or near the aortic arch and associated devices and methods are disclosed herein. A delivery system configured in accordance with embodiments of the present technology can include an outer catheter, an inner catheter assembly extending at least partially through the outer catheter, a handle, a tip capture mechanism configured to releasably secure an end portion of the aortic repair device, and a release wire actuatable to release the end portion from the tip capture mechanism. The handle can be actuated to retract the outer catheter relative to the inner catheter assembly to deploy the aortic repair device. The handle can also be actuated to advance a portion of the inner catheter assembly relative to the outer catheter to reorient and position the end portion of the aortic repair device.

Medical appliances may be formed of multilayered constructs. The layers of the constructs may be configured with various physical properties or characteristics. The disposition and arrangement of each layer may be configured to create an overall construct with a combination of the individual properties of the layers. Constructs may be used to create vascular prostheses or other medical devices.

Provided herein is a device for simultaneous intraoperative leak testing and visualisation of a heart valve seat, the device comprising an end cap configured to engage with and to sealingly close an opening of a tubular vascular graft, the end cap comprising a backing portion, a connector portion, a view port, and at least one fluid conduit element, the connector portion comprising a distal end dimensioned for placement inside of the opening, a first fastening element comprising an external thread, a second fastening element comprising an internal thread and configured to be rotated onto the first fastening element, and the external and internal threads are adapted such that the first and second fastening elements are fittingly engaged with the tubular vascular graft scalingly secured therebetween by less than one rotation of the second fastening element around the outer circumference.

A medical appliance or prosthesis may comprise one or more layers of rotational spun nanofibers, including rotational spun polymers. The rotational spun material may comprise layers including layers of polytetrafluoroethylene (PTFE). Rotational spun nanofiber mats of certain porosities may permit tissue ingrowth into or attachment to the prosthesis. Additionally, one or more cuffs may be configured to allow tissue ingrowth to anchor the prosthesis.

Single and dual frame prosthetic venous valve assemblies, and catheter delivery systems and methods, are disclosed. A representative dual frame venous valve assembly includes an outer valve frame having a lumen and a frame and venous valve assembly arranged within the lumen. The frame and venous valve assembly, which also may be a stand- alone prosthetic venous valve assembly, includes an inner valve frame having a frame matrix forming lateral valve supports and valve commissure supports; a polymeric frame coating encapsulating the frame matrix; and a one or more polymeric leaflets integrally formed with or coupled to the polymeric frame coating, with each leaflet moveable between an open or partially open state and a closed or partially closed state. A delivery catheter includes keys or slots for insertion of locking tabs of the outer valve frame, and a deployment control handle for controlling deployment of the venous valve assembly.

Aspects of the disclosure relate to synthetic tissue or organ scaffolds and methods and compositions for promoting or maintaining their structural integrity. Aspects of the disclosure are useful to prevent scaffold damage (e.g., delamination) during or after implantation into a host. Aspects of the disclosure are useful to stabilize tissue or organ scaffolds that include electrospun fibers.

A catheter system can include a tubular body, and at least one of a targeting system coupled to the tubular body, an expandable member, or a fluid injection port. A method of identifying a bifurcation can include inserting a catheter system into a first vessel, positioning the catheter system at a first location, expanding an expandable member to occlude the first vessel, delivering contrast material so the contrast material pooling proximate to the expandable member, and reviewing a shape of the contrast material in the first vessel under fluoroscopy.

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.

A stent graft delivery system for delivering an aortic prosthetic device includes a handle, an internal lead screw assembly within a track of a handle body of the handle, a lead screw nut that extends about the handle body and threadable engaged with the threaded portion of the internal lead screw assembly, a support member fixed to the handle body, a sheath extending about a portion of the support member and fixed to the internal lead screw assembly, and a hemostasis valve about the supporting member and between the sheath and the lead screw assembly.

The devices and methods described herein include a body lumen fluid flow modulator including an upstream flow accelerator and a downstream flow decelerator. The fluid flow modulator preferably includes one or more openings that define a gap / entrainment region that provides a pathway through which additional fluid from a branch lumen(s) is entrained into the fluid stream flowing from the upstream flow accelerator to the downstream flow decelerator.

The present application provides a shunt device, comprising a shunt member and a flow regulating mechanism. The shunt member comprises a body and an inlet and an outlet located at two ends of the body, and the shunt member defines a shunt passage for pressurized fluid; the flow regulating mechanism is connected to the shunt member, and the flow regulating mechanism is used for regulating the flow of the pressurized fluid flowing through the shunt passage; the flow regulating mechanism comprises a blocking portion having a variable form, and the blocking portion is configured such that when the fluid pressure at the inlet of and / or inside the shunt member is less than the fluid pressure outside the flow regulating mechanism, the blocking portion is driven by the fluid pressure outside the flow regulating mechanism to radially collapse, so that the flow regulating mechanism partially closes the shunt passage.

The utility model provides a balloon dilatation catheter. The balloon dilatation catheter comprises a catheter body, a blood flow tube and a balloon, the blood flow tube comprises a first tube body and a second tube body, the second tube body is located in the first tube body, the outer wall of one side of the second tube body is connected with the inner wall of one side of the first tube body, and a blood flow cavity is formed between the outer wall of the other side of the second tube body and the inner wall of the other side of the first tube body; the balloon is connected to the outer wall of the first tube body in a sleeving mode, and a filling cavity is formed between the balloon and the first tube body; the far end of the catheter body is inserted into the second catheter body, and a first medium cavity is formed between the far end of the catheter body and the second catheter body; and a through part for communicating the first medium cavity with the filling cavity is arranged at the joint of the first pipe body and the second pipe body. The balloon dilatation device can solve the problem of blood flow supply of a far-end blood vessel in the balloon dilatation period.

The invention provides a covered stent coated with an electrostatic spinning membrane and a preparation method thereof.The covered stent comprises a metal stent and a covering membrane, the metal stent is composed of a spiral metal wire, the metal wire is provided with a plurality of zigzag parts which are evenly arranged and connected end to end, every two adjacent zigzag parts are in a wave crest shape and a wave trough shape respectively, and the multiple zigzag parts enable the metal wire to be in a wave shape; the covering film covers the surface of the metal support to form a tubular structure, and the tubular structure can be kept shaped after bending deformation at the lesion position so that the tubular structure can be matched with the lesion position in shape. The covered stent has a high specific surface area and an adjustable porous structure, the micron-sized aperture of the covered stent can effectively prevent blood permeation, the high porosity allows a proper amount of tissue or cells to penetrate, vascularization and tissue integration of the implanted stent are promoted, and therefore the risk of stent displacement or instability is reduced.

The invention discloses an aorta covered stent and an aorta covered stent assembly, and belongs to the technical field of medical instruments. The aorta covered stent comprises a main covered stent body and branch covered stents; a mounting opening is formed in the main body covered stent; the branch covered stent comprises an outer port and an inner port, the side, close to the upstream, of the edge of the outer port is connected with the mounting port through a first membrane, and the first membrane is provided with a first outer convex face and a first inner concave face which are oppositely arranged; one side, close to the downstream, of the edge of the inner port is connected with the mounting port through a second membrane, and the second membrane is provided with a second outer convex surface and a second inner concave surface which are oppositely arranged; the first membrane and the second membrane are connected through the third membrane, and the first membrane, the second membrane and the third membrane seal the installation opening. The assembly comprises a connecting covered stent and the aorta covered stent. The aorta covered stent which does not need to cut the healthy blood vessel of a patient, and is wide in application range, high in flexibility and small in compression occupied space can be formed.

Aortic repair devices and associated systems and methods are disclosed herein. An aortic repair device configured in accordance with embodiments of the present technology can include a base member configured to be implanted in an aorta proximate to a diseased portion of the aorta, such as an aneurysm or dissection near the aortic arch. The base member can direct blood flow past the diseased portion of the aorta to perfuse a portion of the aorta distal of the diseased portion. The aortic repair device can further include a leg member configured to be coupled to the base member. The leg member can provide a flow path from the base member to a branch vessel.

The invention relates to an implantable prosthesis device and an implantable prosthesis system, and relates to the technical field of medical instruments. The implantable prosthetic device includes: a first tubular member having a first lumen; a second tubular member having a second lumen; the first tubular component is connected with the second tubular component, and the second tubular component is partially contained in the first tubular cavity so that the outer wall of the second tubular component can be matched with the inner wall of the first tubular component to form a channel capable of being opened or closed. The channel is in an open state and is communicated with the first pipe cavity; when the first tubular component and the second tubular component are in the radial unfolding state, the channel is in the closed state. The implantable prosthesis device provided by the invention can keep the blood flow smooth in the operation process, and prevents the adverse effect on the health of a patient due to blood flow blockage.

A prosthetic heart valve can comprise a stent frame radially movable between a contracted configuration and a maximum expanded configuration. The stent assembly can comprise a plurality of longitudinally extending jack strut assemblies, wherein each jack strut assembly comprises a proximal jack strut comprising a distal surface, a distal jack strut comprising a proximal surface, and a jack screw connecting the proximal jack strut and the distal jack strut. The proximal surface of each distal jack strut does not contact the distal surface of each respective proximal jack strut when the stent assembly is in the contracted configuration. The proximal surface of each distal jack strut contacts the distal surface of each respective proximal jack strut when the stent assembly is in the maximum expanded configuration.

A prosthesis assembly includes a stent frame that is expandable and configured for being positioned in the ascending aorta, and a receiving socket positioned within a proximal end of the prosthesis assembly. The receiving socket defines a recess for allowing flowthrough of blood into the stent frame. The receiving socket is further configured for selectively receiving a heart valve assembly for replacing a native heart of a patient or maintaining a mode of operation where the socket is empty and blood flows through the socket into the stent frame.