In situ venous valve device and method of formation
First Claim
1. A method for forming a vascular valve for directing blood flow in an antegrade direction to an autologous vessel that requires a vascular valve, said method comprising the steps of,A. providing a tubular conduit means for providing passage for the blood flow from an upstream portion of the autologous vessel to a downstream portion of the autologous vessel, B. folding a portion of a wall of said tubular conduit means and holding it in apposition with another portion of a wall to form at least two regions, a first region having an open inlet end and an open outlet end, and a second region having an open outlet end and closed inlet end, C. holding a portion of a wall of said first region into contact with a portion of a wall of said second region forming at least a portion of at least one valve cusp, whereby said first region provides passage for antegrade blood flow and said valve cusp directs a portion of retrograde blood flow into said open outlet end of said second region.
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Accused Products
Abstract
A venous valve device provides antegrade blood flow in venous vessels of the body having dysfunctional valves; it is formed in situ from autologous vein conduit not having a valve present locally. An overlap region is formed by attaching two opposing walls of the vein together in a generally axial direction forming two tubular regions. One region provides antegrade blood flow and the other region provides a sinus cavity that is filled during the initiation of retrograde blood flow. A valve cusp is formed by attaching vessel wall together forming a commissure that extends between the two overlap regions. A single valve cusp moves toward the sinus cavity to allow antegrade blood flow and moves away from the sinus cavity to block retrograde blood flow. The venous valve can also be formed from biological tissue from an autologous, heterologous, or other tissue source and implanted interpositionally at the site of valvular incompetancy.
100 Citations
16 Claims
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1. A method for forming a vascular valve for directing blood flow in an antegrade direction to an autologous vessel that requires a vascular valve, said method comprising the steps of,
A. providing a tubular conduit means for providing passage for the blood flow from an upstream portion of the autologous vessel to a downstream portion of the autologous vessel, B. folding a portion of a wall of said tubular conduit means and holding it in apposition with another portion of a wall to form at least two regions, a first region having an open inlet end and an open outlet end, and a second region having an open outlet end and closed inlet end, C. holding a portion of a wall of said first region into contact with a portion of a wall of said second region forming at least a portion of at least one valve cusp, whereby said first region provides passage for antegrade blood flow and said valve cusp directs a portion of retrograde blood flow into said open outlet end of said second region.
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11. A vascular valve for directing blood flow in an antegrade direction to an autologous vessel that requires a vascular valve, said vascular valve comprising,
A. a tubular conduit means for providing passage for the blood flow from an upstream portion of the autologous vessel to a downstream portion of the autologous vessel, said tubular conduit having a tubular conduit wall that is divided into sectors, B. a portion of said tubular conduit means in a first sector being held in apposition to another portion of said tubular conduit means that is not contained in said first sector forming a first region having an open inlet end and an open outlet end and a second region having an open outlet end and closed inlet end, and forming a portion of a valve cusp, whereby said first region provides passage for antegrade blood flow and said valve cusp directs a portion of retrograde blood flow into said open outlet end of said second region.
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12. A vascular valve for directing blood flow in an antegrade direction to an autologous vessel that requires a venous valve, said venous valve comprising,
A. a tubular conduit means for providing passage for the blood flow from an upstream portion of the autologous vessel to a downstream portion of the autologous vessel, B. a portion of said tubular conduit means being held in apposition with another portion to form at least two regions, comprising a first region having an open inlet end and an open outlet end, and a second region having an open outlet end and closed inlet end, and forming at least a portion of a valve cusp. whereby said valve cusp directs a portion of retrograde blood flow into said open outlet end of said second region.
Specification