170results about "Blood vessels" patented technology

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.

A stent graft prosthesis for repair of a defective natural vessel comprises a tubular fabric member having at least first and second ends, wherein at least one of those ends is supported by a combination of two cooperating ring stents of different configurations, and the tubular fabric member is attached at selected points to each ring stent, and at least one ring stent is compressible into a folded saddle shape having two peaks and two valleys, and the other ring stent crosses over the saddle shape ring stent at four points, each point being in a region between a peak and a valley of the folded saddle shape. The other ring stent may be selected from ring stents which when deployed, have a circular or cylindrical shape, or a saddle shape, or one or more V-shaped hinge portions with curvilinear portions therebetween, or a Z-shaped stent.

Method for determining the position of windows in aortic endoprostheses, using images from preoperative CT computed tomography, wherein such endoprosthesis comprises a tubular sleeve (1) having a diameter slightly greater than the diameter of such aorta, on which one or more windows (2) must be made in correspondence with the centre of origin of a blood vessel branching from such aorta. The method comprises the following steps: a) on the axial image of such tomography, calculating the aortic arc of circle (AA) between the position (PB) of such centre of origin of the vessel with respect to a reference point (OA) taken on the circumference of the aorta, b) calculating a conversion parameter (P) dependent on the difference between the diameter of the aortic artery and that of the tubular sleeve (1), c) determining the position of the window (PF) on the prosthesis by calculating the arc of circle on the prosthesis (AM) between a reference point (OM) taken on the tubular sleeve (1), placed in juxtaposition to such reference point (OA) on the aorta (A), and such position (PF), by subtracting the value of such conversion parameter (P) from the value of the aortic arc of circle (AA).

Implantable devices—such as stents and rings—that comprise markers for tracking their deployment in a body lumen are disclosed. The markers may be used to monitor progress of expansion of the implantable device, potential migration of the implantable device, and diameters of the body lumen. Markers may be deployed in the body lumen separately from another implantable device to assist tracking of migration of the implantable device. Markers may be placed circumferentially around a wall of a body lumen to track growth of an aneurysm or a stricture.

The application provides a delivery device, a medical system and a rear release mechanism. The delivery device comprises a tube assembly, a guide head and a rear release mechanism. The tube assembly comprises an inner tube and an outer tube. The outer tube is sleeved on the outer circumferential surface of the inner tube, and axial relative movement can be generated between the outer tube and the inner tube. The guide head is arranged at the proximal end of the inner tube, and a plurality of positioning holes are arranged on the guide head in a circumferential direction. The rear release mechanism comprises a wire assembly. The wire assembly can generate axial relative movement with the inner tube. The wire assembly comprises a plurality of restraint wires and a pulling wire. The restraint wires are partially arranged between the inner tube and the outer tube. The proximal end of each restraint wire is used for inserting into a positioning hole. The distal ends of all the restraint wires are connected with the proximal end of the pulling wire. The medical implant is loaded by using the delivery device, and the medical implant is delivered and released to a predetermined position. The positioning accuracy of the release of the medical implant can be improved.

The present application relates to a kind of stent systems, the stent system includes stent and delivery device, the stent includes main body stent and branch stent, the branch stent is located in the side of the main body stent, the delivery device includes sheath core assembly, guide head, sheath and preset guide wire, the guide head is set to the distal end of the sheath core assembly, the sheath is set around the sheath core assembly, the preset guide wire is from the distal end of the main body stent and is from the branch stent, the stent system further includes guide disc, one end of the guide disc is connected with the guide head, the other end of the guide disc is set around the guide head, so that the other end of the guide disc can be relatively axially moved along the guide head;The guide disc includes compressed state and forming state, in the compressed state, the guide disc is placed between the sheath and the guide head in the axial direction, in the forming state, the guide disc is formed with a proximal side guiding surface.This application provides stent system setting guide disc can form proximal side guiding surface in forming state, it is easier to select into branch blood vessel port for preset guide wire, reduce operation time and operation difficulty, and do not need to open upper limb approach, alleviate patient pain.

The present disclosure describes treatment of the vasculature of a patient with an expandable implant. The implant is constrained to a reduced delivery diameter for delivery within the vasculature by at least one sleeve. The implant can be constrained to other diameters, such as an intermediate diameter. The sleeves can be expanded, allowing for expansion of the diameter of the expandable implant, by disengaging a coupling member from the sleeve or sleeves from outside of the body of the patient. The expandable implant can comprise a steering line or lines which facilitate bending and steering of the expandable implant through the vasculature of a patient.

Various aspects of the present disclosure are directed toward apparatuses, systems, and methods for cardiac device anchoring and more specifically to accessing and anchoring in the pericardial space.

The invention relates to an access and occluder device, and in particular a heart valve regurgitation drum and optional closure disk and / or tubular stent to manage and provide levels of intentional regurgitation within a transcatheter heart valve replacement, and in particular, an orthogonally delivered transcatheter prosthetic heart valve having a first inner flow control component / valve, a second inner regurgitation control component, and an outer annular support frame having compressible wire cells that facilitate folding flat along the z-axis and compressing the valve vertically along the y-axis, or orthogonally to the central axis of the flow control component, allowing a very large diameter valve to be delivered and deployed to the tricuspid valve from the inferior vena cava or superior vena cava, or trans-atrrally to the mitral valve, the valve having a height of about 5-60mm and a diameter of about 25-80mm, without requiring an oversized diameter catheter and without requiring delivery and deployment from a catheter at an acute angle of approach.

Introducer sheaths are described. In one embodiment, an introducer sheath comprises a sheath hub, a fixed housing coupled to the sheath hub, a rotating element rotatably coupled to the fixed housing, a sheath tube fixedly coupled to the rotating element, and a lock coupled to the rotating element. The lock is capable of preventing the rotating element and the sheath tube from rotating with respect to the sheath hub.

The present application relates to the technical field of biological tissue engineering, and particularly relates to an artificial blood vessel and a preparation method thereof. The present application creatively develops an artificial blood vessel with a double-network interpenetrating structure based on a design of space-time coupling, wherein a double-layered openwork scaffold serves as a space maintenance network, and a porous hydrogel tube wall serves as a temporary filling network, so that accurate space-time adaptation of degradation and regeneration is realized. Specifically, the double-layered openwork scaffold serves as a main load-bearing framework, and the slow degradation characteristic of the double-layered openwork scaffold provides independent, stable and long-term mechanical support, thereby fundamentally avoiding premature degradation of mechanical properties. Meanwhile, the fast-degrading hydrogel tube wall ensures the airtightness of the blood vessel in the early stage after implantation, and then degrades rapidly to leave a preset and through three-dimensional space for tissue regeneration, thereby ensuring the speed and integrity of the regeneration.

A deployment system is provided. The deployment system includes an expandable stent prosthesis and a medical wire extending through the stent prosthesis. A longitudinal end of the medical wire extends out of a longitudinal end of the stent prosthesis. A protective portion is disposed between the longitudinal end of the stent prosthesis and the longitudinal end of the medical wire. A diameter of the protective portion exceeds a diameter of the longitudinal end of the stent prosthesis when the stent prosthesis is in a collapsed configuration.

The application discloses an absorbable covered stent for treating coronary intervention perforation, relates to the technical field of interventional medical devices, and aims to solve the problems of poor performance and single function of the existing covered stent, comprising a stent which is coiled by multiple lanes of degradable medical magnesium alloy material, a cover which is made of modified polytetrafluoroethylene material and is arranged outside the stent, and an auxiliary repair assembly arranged on the cover; the covered stent is placed in a coronary perforation site, the cover is adhered to a blood vessel wall through the elastic force of the stent, a directional microelectric field is generated through the oxidation-reduction reaction of anode alloy fillings and cathode alloy fillings filled in multiple electrode chambers on the cover, endothelial cells in the arterial perforation site are guided to grow directionally and cover the perforation damage area, and the perforation site is promoted to recover; the covered stent has the advantages of comprehensive function, strong structural stability and absorbable material.

The embodiment of the present disclosure provides a degradable artificial fluid tube, which comprises a tube wall formed by winding a degradable material film and a tube cavity formed in the inside of the tube wall, the tube cavity being configured to allow fluid to flow, wherein the degradable material film is a flexible planar structure, one end of the degradable material film is wound to form an inner wall of the degradable artificial fluid tube, and the other end of the degradable material film is wound to form an outer wall of the degradable artificial fluid tube. The degradable artificial fluid tube provided by the present disclosure has a winding structure, so that when the degradable artificial fluid tube is bent in use, the tube wall can adjust the bending moment degree according to the bending condition of the tube cavity, so as to ensure that the inner diameter of the tube cavity is sufficient for fluid flow, and effectively avoid the embolism problem caused by the reduction of the cross section of the tube cavity due to the bending of the fluid tube.

This invention provides a covered stent and a stent assembly. The covered stent includes a first segment and two second segments respectively disposed at both axial ends of the first segment. The covered stent includes a bare stent and a covering. The bare stent includes a helical structure extending from one second segment through the first segment to the other second segment, and the helical structure has a greater ascending angle in the first segment than in the second segment. The covering covers the circumferential surface of the bare stent. The covered stent is used in a stent assembly as a branch stent for treating lesions involving the aortic arch, and it can well adapt to the anatomical structure of the aortic arch, improving treatment efficacy.

A vascular shunt stent includes a main body tube and at least one branch tube axially inserted into an inner lumen of the main body tube. The main body tube includes a tubular main membrane. At least one branch tube includes a tubular branch membrane, which is accommodated in an inner lumen of the main membrane. A first sealing film is arranged between a distal end of the main membrane and a distal end of the branch membrane to separate the inner lumen of the main membrane into a main opening and at least one first sub-opening, the first sub-opening is in sealed connection with the distal end of the branch membrane. An included angle between a plane defined by the first sub-opening is not parallel with a plane defined by the main opening.

Disclosed in the present invention is a limiting expandable aortic valvular conduit. The limiting expandable aortic valvular conduit comprises a preliminary aortic valvular conduit attached with a collagen fiber coating, wherein the preliminary aortic valvular conduit comprises a proximal pipeline, a valve connecting conduit, and a distal conduit. Further disclosed in the present invention is a preparation method therefor. The limiting expandable aortic valvular conduit provided in the present invention is used for Bentall-type surgeries. Moreover, after the bioprosthetic valve deterioration, the limiting expandable aortic valvular conduit provided in the present invention provides the conditions for implanting a bioprosthetic valve of the same size as the original valve via an interventional approach; that is, after the biological valve deterioration, a valve of the same size as the original valve can be implanted via an interventional approach, without opening the chest of a patient to replace the biological valve of the same size.

The present invention relates to a training device (50, 100, 200, 300) for a surgical procedure for endovascular treatment of an aneurysm, comprising a container (52) having a wall (54) defining a bounded chamber (56) and a first access opening (58) provided in the wall (54), the first access opening (58) being configured to allow insertion of a guide wire (17) and / or a guide catheter (26) for endovascular surgery into the container (52), a first tube (62) connected to the container (52) at the first access opening (58), a target (72, 172), and a movable element (70) comprising a control member (74) connected to the target (72, 172). The target (72, 172) is disposed within the container (52) and comprises a cannulation seat (84, 184) configured to receive the guide wire (17) and / or the guide catheter (26) for endovascular surgery, and the control member (74) at least partially protrudes from the container (52) through control openings (76, 82, 83) in the wall (54) of the container (52). The movable element (70) is movably constrained to the wall (54) of the container (52) at the control openings (76, 82, 83) such that the target (72, 172) can assume a plurality of different positions and / or orientations within the container (52). The present invention further relates to a training method for a surgical procedure for endovascular treatment of an aneurysm in which such a training device (50, 100, 200, 300) is used, and to the use of the device (50, 100, 200, 300) in such a training method.

An implantable medical device comprising a first frame component. The first frame component including a first set of elongate elements configured to conform to an anatomy of a patient. The implantable medical device also comprising a second frame component including a second set of elongate elements configured to conform to an anatomy of a patient. The first frame component and the second frame component being discrete and separate from one another. The implantable medical device also comprising a conduit portion arranged between the first frame component and the second frame component. The conduit portion including a membrane connecting the first frame component and the second frame component.

The present invention provides an artificial blood vessel having an inner surface that appropriately acts on blood flow, and a method for manufacturing an artificial blood vessel having an inner surface that appropriately acts on blood flow. [Solution] The artificial blood vessel comprises a tubular sheet that defines the space through which blood flows. The tubular sheet includes an ion-implanted layer as an inner layer. The main component of the ion-implanted layer is polytetrafluoroethylene. The inner circumferential surface of the ion-implanted layer is composed of a roughened surface mainly made of polytetrafluoroethylene.

Medical devices are provided, comprising a medical device and a sensor.

A method of manipulating a deployment device is provided. The method includes delivering a deployment system including an expandable branching stent prosthesis to a branching implant site including a trunk, a first branch, and a second branch. The branching stent prosthesis includes a trunk portion, a first branching portion, and a second branching portion. The method further includes advancing a sheath over the second branching portion, seating the stent prosthesis at the branching implant, and withdrawing the sheath from over the second branching portion.

A stent graft delivery system includes a stent graft and a thermal stent graft cutter for shortening the stent graft to a desired length in vivo. The thermal stent graft cutter is coupled to at least one of a stent graft cover at a distal longitudinal end of a cover body thereof, and the inner lumen tip of an inner lumen. A safety system allows activation of the stent graft cutter only when the stent graft is suitably sandwiched between the inner lumen tip and the distal end of the stent graft cover to inhibit inadvertent activation of the cutter and provide for proper cutting of the stent graft.

This invention provides a monitoring system for arteriovenous fistulas (AVFs) in artificial blood vessels, relating to the field of medical monitoring technology. It includes a multimodal data acquisition unit, an adaptive signal processing unit, an early warning feedback module, a reference measurement component, and a passive energy transducer module. The multimodal data acquisition unit comprises a flexible strain sensor encapsulated on the surface of the artificial blood vessel, a pressure-conducting diaphragm positioned at the venous branch of the artificial blood vessel, a thermistor array attached to the skin surface, and a resonant auscultation cavity integrating a miniature microphone. This system achieves 24-hour continuous real-time monitoring, effectively solving the problem of existing technologies relying on manual or intermittent detection. Utilizing the passive energy transducer module, powered by the blood vessel's own pulsation, and combined with the synchronous acquisition by the flexible strain sensor, pressure-conducting diaphragm, thermistor array, and resonant auscultation cavity, continuous monitoring of the AVF status is achieved.

This invention relates to a vascular stent for the visceral region of the abdominal aorta, comprising an interconnected proximal non-degradable segment and a distal degradable segment. The proximal non-degradable segment includes a non-degradable metal skeleton and a covering structure. The distal degradable segment is a degradable bare skeleton. The proximal non-degradable segment corresponds to the location of the primary tear in the visceral region of the abdominal aorta, and the distal degradable segment corresponds to the location of branch vessels in the visceral region of the abdominal aorta. This invention is applicable to abdominal aortic dissection anatomical features, where the proximal stent segment is non-degradable and covered, while the distal visceral segment is degradable but not covered. It promotes false lumen thrombosis by sealing the primary tear through covering, while maintaining patency of branch vessels in the visceral segment by not covering. Simultaneously, a drug layer is attached to the covering of the proximal stent segment to actively promote intimal repair.

This invention provides poly(hydroxyoxazolidinone) compounds (PHOx) corresponding to formula (I) or formula (II): wherein R1 ’ R2 ’ Each of the following elements independently represents a C1-C20 alkyl group, preferably a C1-C10 alkyl group, more preferably a C1-C3 alkyl group, and most preferably a methyl group; and -R3 and -R4 independently represent hydrogen or a C1-C20 alkyl group, preferably a C1-C10 alkyl group, more preferably a C1-C3 alkyl group, and most preferably a methyl group; and -R5 and -R5 ’ R6, R6 ’ Each of the following groups independently represents hydrogen or a C1-C20 alkyl group, preferably a C1-C10 alkyl group, more preferably a C1-C3 alkyl group, most preferably methyl, or aryl, preferably phenyl; and A is an organic linking group selected from straight-chain, branched, saturated, unsaturated, cyclic and / or acyclic aliphatic, aromatic or arylaliphatic hydrocarbon groups, preferably having 1 to 20, more preferably 1 to 12, most preferably 1 to 8 carbon atoms, and optionally further comprising one or more functional groups selected from ethers, esters, amides, amines, carboxyl groups, sulfur, halogens and / or carbamates; and optionally, A, R3 and R4 in formula (I) are linked to each other to form a cyclic structure; and optionally, R5 and R5 in formula (II) are linked to each other to form a cyclic structure. ’ , and / or R6 and R6 ’ They are interconnected to form a ring structure; and -R7 is a polymer chain selected from polysiloxanes or polyethers; and n is an integer from 2 to 100, preferably from 2 to 50, more preferably from 2 to 25, and most preferably from 2 to 15. The present invention also provides a process for forming the PHOx compound of the present invention and a poly(alkylene oxazolidinone) compound (POx) obtained by dehydrating the PHOx compound of the present invention. (I)(II).

The present disclosure is directed to lens, methods of making, designing lens and / or methods using lens in which performance may be improved by providing one or more steps in the central portion of the optical zone and one or more steps in the peripheral portion of the optic zone. In some embodiments, such lens may be useful for correcting refractive error of an eye and / or for controlling eye growth.