70 results about "Pulmonary valve" patented technology

A system for replacing a pulmonary valve includes a conduit having a lumen, a delivery catheter and a replacement valve device disposed on the delivery catheter. The replacement valve device includes a prosthetic valve connected to a valve support region of an expandable support structure. The valve support region includes a plurality of protective struts disposed between a first stent region and a second stent region. A method for replacing a pulmonary valve includes implanting a conduit and delivering a replacement valve device to the conduit. The replacement valve device includes a valve connected to a valve support region that includes a plurality of protective struts. The method also includes deploying the prosthetic valve device from a delivery catheter into the lumen, positioning the prosthetic valve device within the conduit lumen and expanding the prosthetic valve device into contact with the inner wall of the conduit.

A valve replacement system that can be used for treating abnormalities of the right ventricular outflow tract in a nonsymmetrical region of a vessel or conduit that includes a prosthetic valve device and a foundation structure. The foundation structure contacts a portion of the inner wall of a vessel or conduit, and undergoes a shape change resulting in a corresponding change in the wall of the vessel or conduit. As a result, the lumen of the conduit is made symmetrical, and is complementary to the exterior surface of the stented valve, and thereby, improves the functioning of the valve. Another embodiment of the invention includes a method for replacing a pulmonary valve that includes forming a symmetrical region in a lumen of a conduit and placing a stented valve in the symmetrical region.

A system for treating abnormalities of the right ventricular outflow tract includes a prosthetic valve device having a barrier material contacting at least a portion of the outer surface of the valve device. One embodiment of the invention includes a barrier member attached to the exterior surface of the valve device. Another embodiment includes a barrier material that is injected within the vascular system. Yet another embodiment of the invention includes a method for replacing a pulmonary valve that includes forming a barrier around the outer surface of a replacement valve and preventing blood flow around the replacement valve.

The invention relates to a novel percutaneous aortic valve and pulmonary valve exchanger, which is a self-expand support with biological valve, formed by the support in special shape and made from nickel titanium alloy skeleton and the three-blade one-way opening valve formed by pig heart, wherein, the support has fixing and supporting functions, and the pig heart forms three valves fixed in the support. The invention has little hurt, high safety and reduced complication.

A tiny electrically powered hydrodynamic blood pump is disclosed which occupies one third of the aortic or pulmonary valve position, and pumps directly from the left ventricle to the aorta or from the right ventricle to the pulmonary artery. The device is configured to exactly match or approximate the space of one leaflet and sinus of valsalva, with part of the device supported in the outflow tract of the ventricular cavity adjacent to the valve. In the configuration used, two leaflets of the natural tri-leaflet valve remain functional and the pump resides where the third leaflet had been. When implanted, the outer surface of the device includes two faces against which the two valve leaflets seal when closed. To obtain the best valve function, the shape of these faces may be custom fabricated to match the individual patient's valve geometry based on high resolution three dimensional CT or MRI images. Another embodiment of the invention discloses a combined two leaflet tissue valve with the miniature blood pump supported in the position usually occupied by the third leaflet. Either stented or un-stented tissue valves may be used. This structure preserves two thirds of the valve annulus area for ejection of blood by the natural ventricle, with excellent washing of the aortic root and interface of the blood pump to the heart. In the aortic position, the blood pump is positioned in the non-coronary cusp. A major advantage of the transvalvular VAD is the elimination of both the inflow and outflow cannulae usually required with heart assist devices.

Disclosed are methods, compounds and compositions useful for treatment of a patient with valvular dysfunction. The invention relates to using stem cells, modified stem cells, derivatives thereof, and agents stimulatory to stem cells in order to substantially ameliorate, and in some cases induce a therapeutic benefit, to a patient suffering from a dysfunction of the mitral, aortic, tricuspid, or pulmonary valve. In some embodiments the invention treats the valve dysfunction itself, whereas in other embodiments treatment of associated cardiac structures is performed. Furthermore, in other embodiments the invention permits physiological compensation for the valve dysfunction, prolonging the time until surgical intervention is needed.

There is provided an artificial cardiac or heart valve, more particularly a flexible leaflet heart valve used to replace natural aortic or pulmonary valves of the heart in which the leaflet geometry is defined by a parabolic function and a method of manufacturing said artificial cardiac valves. In addition, there is provided leaflets which have geometry defined by a parabolic function.

A method for diagnosing pulmonary hypertension from phase-contrast magnetic resonance (MR) images includes providing a time series of one or more magnetic resonance (MR) flow images of a patient's mediastinum during one or more cardiac cycles, segmenting the pulmonary artery within each image of the times series of images, identifying the anterior wall and pulmonary valve within the segmented pulmonary artery, analyzing blood flow during a diastolic phase of the one or more cardiac cycles to determine a relative duration of blood flow, t_streamlines, during the diastolic phase, analyzing blood flow during a latter portion of a systolic phase and a subsequent diastolic phase of the one or more cardiac cycles to detect the presence and duration t_vortex of a vortex, and diagnosing the presence of pulmonary hypertension from t_streamlines and t_vortex.

A prosthetic tissue valve for aortic, pulmonary, mitral or tricuspid valve replacement is described herein. A sewing ring for use with the prosthetic tissue valve is also described. The valve can have a circumference that is a predetermined distance larger than the circumference of an annulus in a defective valve. The valve can be substantially planar in an unstressed position before attachment at the annulus and substantially non-planar upon attachment in a biased position at the annulus. Methods are provided for placing the valve as described herein in the biased position within the annulus of the defective valve.

The invention discloses a pulmonary artery support and a pulmonary artery valve replacement device with the same. The pulmonary artery support comprises a tubular support net rack, an inflow section and an outflow section, wherein the inflow section and the outflow section are connected to two axial ends of the support net rack and are radially expanded to form flareouts; the part, adjacent to the outflow section, of the support network rack is provided with a plurality of first cells distributed in the circumferential direction; the outflow section is composed of a plurality of positioning strips which are sequentially distributed in the circumferential direction of the support network rack; the middle of each positioning strip is bent toward the outflow direction; two ends of each positioning strip are connected with the top points of two separated first cells. The pulmonary artery valve replacement device comprises the pulmonary artery support, and a prosthesis valve fixed in the pulmonary artery support. The pulmonary artery support disclosed by the invention is unlikely to cause damage to blood vessels and has little blocking effect on blood flow.

The invention provides a trileaflet semi-lunar prosthetic tissue valve for aortic, pulmonary, mitral or tricuspid valve replacement. The valve is planar before attachment at an annulus of a valvular lumen, and non-planar upon attachment at the annulus of the defective valve. A sewing ring having a circumference greater than the annular circumference of annulus of the valve being replaced is also described and the sewing ring is placed at the approximate position of the annulus of the defective valve in a non-planar configuration.

The invention belongs to the field of interventional therapy, and relates to a balloon catheter for ultrasound-guided percutaneous pulmonary valve balloon dilatation. The balloon catheter comprises a catheter and two balloons which are arranged on the outer side of the catheter, the balloons are connected with the catheter in a sleeving mode to achieve sealing, and the two balloons comprises a guiding balloon and a working balloon in sequence; three tunnels which are parallel in the length direction of the catheter and are independent from one to another, each balloon is correspondingly and only connected to the outer side of each tunnel opening located on the side wall in a sealing and sleeving mode, and therefore inflatable sealed spaces which are independent and non-interfering are formed. According to the dilatation used by the balloon catheter, ultrasound can be effectively used for guiding, and the harm brought by radioactive ray guiding in the prior art can be avoided. The double-balloon design is beneficial for reducing the diameter of the catheter and reducing complications of femoral vein injury, and suitable for an underweight patient. Spacing of 1-5 cm exists between the guiding balloon and the working balloon to enable the guiding balloon to play a role in positioning, and when the guiding balloon is located nearby an opening of a left pulmonary artery, the working balloon is exactly located on a pulmonary valve ring.