摘要:
A two-stage method of compressing a stent entails providing an expandable stent (100,105) in a radially expanded state. An outward pressure is applied to an inner surface of the tubular framework to support the stent, and a diameter of the stent is reduced to a first compressed diameter (D1) while applying the outward pressure. The outward pressure is halted after reaching the first compressed diameter. According to an embodiment in which the stent is balloon-expandable, a delivery balloon catheter (130) comprising an uninflated balloon in a delivery configuration is inserted into the lumen after halting the outward pressure. The diameter of the stent is reduced to a second compressed diameter (D2) smaller than the first compressed diameter to crimp the stent onto the delivery balloon catheter.
摘要:
A two-stage method of compressing a stent entails providing an expandable stent (100,105) in a radially expanded state. An outward pressure is applied to an inner surface of the tubular framework to support the stent, and a diameter of the stent is reduced to a first compressed diameter (D1) while applying the outward pressure. The outward pressure is halted after reaching the first compressed diameter. According to an embodiment in which the stent is balloon-expandable, a delivery balloon catheter (130) comprising an uninflated balloon in a delivery configuration is inserted into the lumen after halting the outward pressure. The diameter of the stent is reduced to a second compressed diameter (D2) smaller than the first compressed diameter to crimp the stent onto the delivery balloon catheter.
摘要:
A method for making a graft layer is provided. The graft layer has at least two layers with different porosities. The two layers are applied by electrospinning. The parameters of the electrospinning may be varied when applying the first and second layers in order to achieve different porosities of the first and second layers.
摘要:
A method for making a graft layer is provided. The graft layer has at least two layers with different porosities. The two layers are applied by electrospinning. The parameters of the electrospinning may be varied when applying the first and second layers in order to achieve different porosities of the first and second layers.
摘要:
The disclosure relates to methods of imaging a portion of a body vessel using magnetic resonance imaging (MRI), methods of performing interventional medical treatment under MRI, interventional medical devices, such as wire guides, useful in performing treatment under MRI, and methods of making interventional medical devices. A method of imaging a portion of a body vessel of a patient using MRI includes advancing through a body vessel an end of a wire guide comprising a continuous metal core member and a continuous jacket disposed over the entire core member through a body vessel and scanning the portion of the patient that is positioned within an MRI scanner and that includes a portion of the body vessel within which the end of the wire guide is disposed. A secondary medical device, such as a catheter, can be disposed over the wire guide and manipulated in the method.
摘要:
An implantable graft device having treated yarn is disclosed. The device comprises a graft body forming a lumen defining a longitudinal axis and comprising proximal and distal ends. The graft body comprises a woven fabric having warp yarns aligned in a first direction and a weft yarns aligned in a second direction. At least one of the weft yarns and the warp yarns has an agent applied thereto defining treated yarns of the graft body.
摘要:
A balloon catheter is provided that may be used to dilate hardened regions of a stenosis on a vessel wall. The balloon catheter is provided with cutting elements that extend along a surface of a balloon. At least one bioactive is present, either on the cutting element, within the interior of the balloon, within the material of the balloon or on an outside surface of the balloon. The bioactive is delivered to the vessel wall upon dilation of the balloon.
摘要:
The disclosure relates to support frames for prosthetic implantable valves. The support frames may include a plurality of symmetrically arrayed interconnected U-shaped member structures. Preferred support frames are tubular structures enclosing a longitudinal axis and including a plurality of U-shaped member structures facing a distal or a proximal end of the support frame. Each U-shaped member structure may be connected to a single longitudinally adjacent U-shaped member facing in an opposite longitudinal direction, as well as two laterally adjacent U-shaped members.
摘要:
An implantable valve prosthesis is provided. The valve prosthesis includes a frame structure having first and second independent frame elements. A graft member is attached to both the first and second frame elements and includes a closure member, such as a valve leaflet. The closure member is movable between a first position that allows fluid flow through the prosthesis in a first, antegrade direction and a second position that restricts flow through the prosthesis in a second, retrograde direction.
摘要:
The present disclosure describes an implantable branched vessel prosthesis, such as a prosthetic valve, having both a radially expandable annular portion and a laterally extendable branch portion. Methods of delivering the branched vessel prosthesis to a branched body vessel are also provided, as well as delivery systems comprising the branched vessel prosthesis. The branched vessel prostheses are useful, for example, as implantable prosthetic venous valves for treating venous valve insufficiency. The delivery system is configured to deploy independently both the annular portion within a primary vessel and the branch portion within a branch vessel with only one delivery system.