摘要:
A valve prosthesis (43), such as an artificial venous valve, having a support frame (11) and leaf structure comprising one or more leaflets (78, 79) in which the outer edge (112) of each leaflet engages the inner circumference of the bodily passageway along a serpentine path urged against the passageway by an expandable frame, while the inner edges move in response to fluid to restrict retrograde flow. Optionally, one or more elements (31, 32) can extend from the support frame/leaf structure to provide centering support and/or protection from the leaflet adhering to the vessel wall. In one embodiment, the centering support structure (164) comprises a second or third expandable frames (31, 32) attached to and extending from the proximal and/or distal ends of main valve structure and support frame. In another embodiment, one or more support elements extend outward from the valve support frame to engage the vessel wall to provide greater longitudinal stability.
摘要:
The present invention provides self-expanding or otherwise expandable artificial valve prostheses for deployment within a bodily passageway, such as a vessel or duct of a patient. The valve prostheses include a support structure having an outer frame (201) defining a lumen and supporting radial members (204,205,206) each having a first end joined with the first end of the other radial members within the lumen and a second end attached to the circumference portion (202) of the outer frame (201).
摘要:
A valve prosthesis (43), such as an artificial venous valve, having a support frame (11) and leaf structure comprising one or more leaflets (78, 79) in which the outer edge (112) of each leaflet engages the inner circumference of the bodily passageway along a serpentine path urged against the passageway by an expandable frame, while the inner edges move in response to fluid to restrict retrograde flow. Optionally, one or more elements (31, 32) can extend from the support frame/leaf structure to provide centering support and/or protection from the leaflet adhering to the vessel wall. In one embodiment, the centering support structure (164) comprises a second or third expandable frames (31, 32) attached to and extending from the proximal and/or distal ends of main valve structure and support frame. In another embodiment, one or more support elements extend outward from the valve support frame to engage the vessel wall to provide greater longitudinal stability.
摘要:
The present invention provides self-expanding or otherwise expandable artificial valve prostheses for deployment within a bodily passageway, such as a vessel or duct of a patient. The valve prostheses include a support structure having an outer frame (201) defining a lumen and supporting radial members (204,205,206) each having a first end joined with the first end of the other radial members within the lumen and a second end attached to the circumference portion (202) of the outer frame (201).
摘要:
An expandable venous valve having a support structure (11) that configured to enlarge the area adjacent to the valve structure (12) such that the flow patterns of retrograde flow are modified in a way that facilitates the flushing of the pockets at the base of the valve area to prevent stagnation of bodily fluid, which in the venous system, can lead to thrombus formation. The enlarged pocket areas can be created by forming an artificial sinus (34) adjacent the valve structure in an unsupported section of vessel wall between two support frame section or the support frame can comprise an expanded-diameter intermediate or proximal section that forms an artificial sinus adjacent the valve structure. In another group of embodiments, the attachment pathway between opposing leaflets and the support frame and/or vessel wall comprises a proximal portion that places the leaflets in extended contact with one another and a distal portion forms a large angle with respect to the adjacent walls such that a large pocket is created at the base of the leaflets. In one embodiment, the attachment pathway extends distally along a pair of substantially parallel longitudinal attachment struts to create an extended leaflet contact area, then angles circumferentially and distally from the former along distal attachment struts to define the bottom edge of the leaflets.