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US 2001/0025187 A1Published application
Vein filter
AssigneeNipro Corporation
InventorMasayosi Okada
Life of this patent
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AssigneeNipro Corporation
InventorMasayosi Okada
Estimating the term…
A vein filter having improved collectability of chyme blood or thrombi and stability of in dwelling. The filter includes at least 3 wires radially spreading backward of a head member and connected such that the intervals between any adjacent two wires are connected with threads of an equal length at a substantially equal distance from the head member. At respective connection parts where the threads are connected to the wires, hook parts to be hooked on the inner wall of a blood vessel are provided. The head member is on the apex of a shaft extending back and the rear end of each wire is connected to a slide member slidable along the shaft. The wires are preferably made of shape memory alloy or stainless spring steel.
A vein filter comprising a head member, at least three wires of equal length, said wires having front ends fixed to said head member, and extending radially from said head member backward, a connection part comprising threads of substantially equal length, each thread connecting two adjacent wires at a position an equal distance from said head member, and a hook part provided at a connection between a thread and wire for hooking onto an inner wall of a blood vessel to fix the filter.
Dependencies are inferred from the claim text.