17 results about "Valve prosthesis" patented technology

This invention provides a valve prosthesis, comprising: a valve stent, leaflets, and a leaflet connector; the valve stent has a support rod; the leaflet connector includes a folded portion and a connecting portion, the folded portion being used to fold and accommodate the support rod; the connecting portion extends from both ends of the folded portion, and the connecting portion connects to the leaflet, such that the leaflet is connected to the support rod through the leaflet connector. This design improves the leaflet closure and the connection stability between the leaflet and the valve stent, thereby enhancing the overall stability of the valve prosthesis under complex operating conditions.

A dry valve crimping and loading system includes packaging, a crimper disposed in the packaging, and a dry valve prosthesis disposed within a crimper chamber of the crimper. The crimper chamber has a first volume in an expanded state a second volume in a collapsed state, wherein the first volume is greater than the second volume. The crimper is configured to transition the dry valve prosthesis from an uncompressed state to a compressed state when the crimper chamber transitions from the expanded state to the collapsed state to expel the glycerol from the dry valve prosthesis as the crimper transitions the dry valve prosthesis from the uncompressed state to the compressed state.

The disclosure relates to heart valve prostheses with the reduced need of pacemaker implantation and / or improved means for positioning the replacement heart valve. A heart valve prosthesis is provided with a stent and at least one locator. The locator has an adapted design for positioning within a cusp of the native aortic valve for implantation at the native heart valve site. Placement of the locators within the cusps preferably prevents movement from the native heart valve site post-implantation, including proximal movement of the prosthesis into the left ventricle.

This invention provides a transcatheter valve prosthesis comprising a stent, a prosthetic valve component, and a paravalvular leakage prevention component. The paravalvular leakage prevention component is coupled to the stent and includes an inner skirt, an outer covering, a lumen, an opening, and a one-way valve. The inner skirt is disposed on an inner surface of the stent and has an inflow end and a downstream end. The outer covering surrounds an outer surface of the stent and has an inflow end and a downstream end, the inflow end being coupled to the inflow end of the inner skirt. The lumen is formed between the outer surface of the inner skirt and the inner surface of the outer covering. The opening is disposed between the inner skirt and the outer covering. The one-way valve includes a flap at the opening, the flap being configured to open to allow blood to flow into the lumen but prevent blood from flowing out of the lumen.

This invention relates to a valve prosthesis, which includes a support body and an elastic element disposed outside the support body. The support body has a through-hole, and the elastic element is arranged circumferentially around the support body, forming an annular cavity structure with the support body. The through-hole communicates with the annular cavity structure. Thus, by providing a through-hole in the support body, the through-hole communicates with the semi-closed structure, allowing blood flow within the semi-closed structure to flow out through the through-hole, preventing blood from stagnating within the semi-closed structure and forming a thrombus, thus promoting smooth blood flow. Furthermore, blood flow in the opposite direction can flow into the elastic element, where it is buffered, preventing blood from directly overflowing from the sidewall of the stent due to the through-hole in the inner fabric, thus avoiding paravalvular leakage.

The present disclosure relates to valve replacement devices that are foldable for catheter-based deployment to the site of implantation, as well as systems for the delivery of valve prostheses, including prostheses having the special characteristics of the disclosed valve replacement devices. The devices include highly effective adhering mechanisms for secure and enduring precision implantation. The adhering mechanisms may employ a unique sealing mechanism that includes a cuff that expands slowly whereby the device is not secured in place until the completion of the implantation procedure. The implanted device, optionally together with the cuff, prevents perivalvular leaks and incorporate an appropriate leaflet system for reliable functioning in situ.

This invention relates to the field of medical device technology, and more particularly to an absorbable valve stent and a valve prosthesis including the absorbable valve stent. The absorbable valve stent includes an inner stent and an outer stent disposed on the outer periphery of the inner stent. The outer stent includes a main body segment and a valve annulus segment connected together. The main body segment is used to match the atrium, and the valve annulus segment is used to match the valve annulus. The bottom of the valve annulus segment is connected to the bottom of the inner stent via a connecting frame. The main body segment is composed of a first rod, which is either a non-fully absorbable rod or entirely made of a biodegradable absorbable material. The non-fully absorbable rod includes an inner core made of a non-biodegradable absorbable material and an outer sheath made of a biodegradable absorbable material that wraps around the inner core. After implantation, the support force of the main body segment on the atrium is weakened by the degradation and absorption of the outer sheath, or the support of the atrium is relieved by the complete degradation and absorption of the main body segment, allowing the atrium to restore normal contractility.

A medical device for treating a heart valve insufficiency, with an endoprosthesis which can be introduced into a patient's body and expanded to secure a heart valve prosthesis in the patient's aorta. In an embodiment, the endoprosthesis has a plurality of positioning arches configured to be positioned with respect to a patient's aorta and a plurality of retaining arches to support a heart valve prosthesis. The endoprosthesis includes a first collapsed mode during the process of introducing it into the patient's body and a second expanded mode when it is implanted.

A method of delivering and deploying a modular heart valve prosthesis includes delivering a first heart valve device including a first valve support and an anchoring frame in a radially compressed configuration to a site of a native heart valve. A first prosthetic valve including first leaflets having a first thickness is disposed within the first valve support. The method further includes deploying the first heart valve device within native leaflets of the native heart valve, delivering a second heart valve device in a radially compressed configuration to within the first valve support, and deploying the second heart valve device within the first prosthetic valve and the first valve support. The second heart valve device includes a second valve support and a second prosthetic valve comprising second leaflets having a second thickness greater than the first thickness disposed within the second valve support.

The embodiment of the application provides a heart valve stent, a heart valve prosthesis and a preparation method thereof, and belongs to the technical field of medical devices. The heart valve stent comprises a first valve frame and a second valve frame. The first valve frame comprises a first valve frame body and a plurality of first valve corners. The first valve frame body defines a flow channel for blood circulation. The plurality of first valve corners are distributed along the circumference of the first valve frame body and are located on the same side of the first valve frame body in the axial direction. The second valve frame comprises a plurality of second valve corners for connecting valve leaflets. The plurality of second valve corners have the same extension direction in the axial direction as the first valve corners and correspond to the first valve corners in the circumferential direction. The second valve frame is arranged on the radially inner side of the first valve frame. The second valve frame and the first valve frame are connected after being shaped, and the second valve corners are connected with the corresponding first valve corners. The heart valve stent is beneficial to reducing the difficulty of covering the membrane, improving the covering effect of the heart valve stent, and prolonging the service life of the heart valve stent.

The application discloses a valve prosthesis, comprising an inflow end, an outflow end and a main body part, two ends of the main body part are connected with the inflow end and the outflow end respectively, the maximum circumference of the main body part is greater than the maximum circumference of the inflow end or the outflow end; further comprising a valve leaflet assembly, the valve leaflet assembly is connected with the inner wall of the main body part, the maximum circumference of the valve leaflet assembly is greater than the maximum circumference of the inflow end or the outflow end. Thus, by the maximum circumference of the main body part being greater than the maximum circumference of the inflow end or the outflow end, the valve leaflet assembly is connected with the inner wall of the main body part, the maximum circumference of the valve leaflet assembly is greater than the maximum circumference of the outflow end or the outflow end, so that the opening area of the valve leaflet assembly is increased, so as to facilitate the blood flow through the valve leaflet assembly and promote the blood circulation.

The application provides a valve stent and a valve prosthesis, the valve stent comprising an outer layer stent, an inner layer stent and at least one buffer part; the outer layer stent is sleeved outside the inner layer stent and is connected with the inner layer stent through the buffer part. The buffer part can effectively reduce the influence of the deformation of the outer layer stent on the opening and closing of the valve leaflet on the inner layer stent, so that the buffer part can significantly weaken or isolate the mutual force between the outer layer stent and the inner layer stent. In addition, the valve stent adopts the design of double-layer stent, which can effectively improve the fatigue resistance of the valve prosthesis, make the valve prosthesis more fit the original tissue, reduce the influence of the valve stent on the ventricular contraction capacity and ensure the stability of the closed valve stent.

The present application provides a venous valve prosthesis, comprising a stent body and a valve; the stent body has an inner cavity, and the stent body comprises a proximal positioning part, a supporting part and a distal positioning part; the valve is connected to at least the supporting part and divides the inner cavity into a first segment and a second segment arranged from the proximal end to the distal end; the valve has a first position and a second position; the venous valve prosthesis is used for implanting into a target lumen for the target liquid to flow through; when the valve is subjected to a pressure from the target liquid pointing from the distal end to the proximal end, the valve is in the first position, so as to make the first segment and the second segment communicate to allow the target liquid to flow from the second segment into the first segment; when the valve is subjected to a pressure from the target liquid pointing from the proximal end to the second segment, the valve is in the second position, so as to make the first segment and the second segment isolated to prevent the target liquid from flowing from the first segment into the second segment. The venous valve prosthesis can be implanted into a venous vessel and replace a diseased venous valve, thereby preventing blood reflux.

The application belongs to the field of medical devices, and particularly relates to a valve prosthesis for treating a tricuspid valve, comprising a stent and artificial valve leaflets, wherein the stent comprises a braided ring and a valve sewing segment, the braided ring is connected with the valve sewing segment, the braided ring comprises a ventricular part, an annulus part and an atrial part, the atrial part comprises a septal annulus segment, an anterior annulus segment and a posterior annulus segment, the anterior annulus segment and the posterior annulus segment are both provided with close-fitting structures, the close-fitting structures enable the edges of the anterior annulus segment and the posterior annulus segment to be pressed towards the proximal end direction, the edges of the anterior annulus segment and the posterior annulus segment are in a wavy shape, the edges of the middle region of the anterior annulus segment and the middle region of the posterior annulus segment are at wave trough positions, the edges of the end of the anterior annulus segment and the end of the posterior annulus segment are at wave crest positions, and when the native valve is opened and closed, the edge height of the middle region of the anterior annulus segment and the edge height of the middle region of the posterior annulus segment are always lower than the edge height of the end of the anterior annulus segment and the edge height of the end of the posterior annulus segment.

The application belongs to the technical field of interventional medical instruments, and provides an artificial valve prosthesis conveying device, which comprises a handle part, a valve prosthesis containing assembly, a first pipe body in sealed connection with the valve prosthesis containing assembly, a second pipe body extending in the first pipe body and penetrating through the first pipe body, and a third pipe body extending in the second pipe body and penetrating through the second pipe body; a first sealing piece for preventing the distal end of the first pipe body from taking in air is arranged in the valve prosthesis containing assembly, a second sealing piece for preventing the proximal end of the second pipe body from taking in air is arranged between the second pipe body and the handle part, and a third sealing piece for preventing the proximal end of the third pipe body from taking in air is arranged in the handle part. According to the scheme, the emptying operation of the artificial valve prosthesis conveying device can be simpler and more reliable, and the operation safety can be improved.

The present application relates to a multi-part replacement heart valve prosthesis. The replacement mitral valve prosthesis includes a support structure and a valve body having three flexible leaflets. The support structure preferably includes an inner valve frame and an outer sealing frame. The valve frame supports the flexible leaflets. The sealing frame is adapted to conform to the shape of a native mitral annulus. The sealing frame can be coupled to an inlet end of the valve frame, an outlet end of the valve frame, or both. A plurality of anchors are coupled to the outlet end of the valve frame. The anchors extend radially outward to be disposed behind native leaflets. The prosthesis preferably includes a skirt disposed along an exterior of the outer sealing frame. The prosthesis is collapsible for delivery into the heart by a delivery catheter. The prosthesis is configured to self-expand for deployment in the heart upon release from the delivery catheter.