Valve insertable into a body lumen
A valve insertable into a body lumen has a body region forming a first leaflet and a second leaflet, with the first leaflet in contact with the second leaflet to provide the valve with a closed position. The body region includes a multiblock copolymer that is biomimetic and hydrolytically stable.
1. A valve insertable into a body lumen, the valve comprising:
a body region forming a first leaflet and a second leaflet, with the first leaflet in contact with the second leaflet to provide the valve with a closed position;
wherein the body region comprises a viscoelastic triblock copolymer that is biomimetic and hydrolytically stable comprising:
wherein:
each Z represents a point of attachment to a urethane or urea linkage;
each of X and Y is independently a polymer or co-polymer chain formed from one or more of a polyether, a polyester, a polycarbonate, or a fluoropolymer;
each of R1, R2, R3, R4, R5 and R6 is independently selected from one or more of R, OR, —CO2R, a fluorinated hydrocarbon, a polyether, a polyester or a fluoropolymer;
each R is independently hydrogen, an optionally substituted C 1-20 aliphatic group, or an optionally substituted group selected from phenyl, 8-10 membered bicyclic aryl, a 4-8 membered monocyclic saturated or partially unsaturated heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulphur, or 5-6 membered monocyclic or 8-10 membered bicyclic heteroaryl group having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur;
each of m, n, and p is independently 2 to 100; and
each of L1 and L2 is independently a bivalent C 1-20 hydrocarbon chain wherein 1-4 methylene units of the hydrocarbon chain are optionally and independently replaced by —O—, —S—, —N(R)—, —C(O)—, —C(O)N(R)—, —N(R)C(O)—, —SO 2 —, —SO 2 N(R)—, —N(R)SO 2 —, —OC(O)—, —C(O)O—, or a bivalent cycloalkylene, arylene, heterocyclene, or heteroarylene, provided that neither of L 1 nor L 2 comprises a urea or urethane moiety.
2. The valve of claim 1 , further comprising a proximal rim defining an outer perimeter of the valve at a proximal end of the valve.
3. The valve of claim 2 , wherein the body region extends in a distal direction away from the proximal rim to form the first leaflet and the second leaflet.
4. The valve of claim 1 , wherein the valve is adapted to allow antegrade flow through the valve in a first direction from a proximal end of the valve through the first leaflet and the second leaflet.
5. The valve of claim 1 , wherein the valve is adapted to invert to allow retrograde flow through the valve in a direction from the first leaflet and the second leaflet toward a proximal end of the valve.
6. The valve of claim 1 , wherein the body region comprises a foam.