Patent ID: 7632290

Claim:
A blood vessel anastomosing auxiliary tool, comprising: a hollow conduit having openings only at both ends, and having flexibility and self-restoring property for inserting into a blood vessel; a blood leaking preventer to prevent blood leaking from a space formed between the external wall of said conduit and an inner wall of the blood vessel, when the hollow conduit is inserted into the blood vessel; and a retrieving means for retrieving said conduit from within the blood vessel, wherein said blood leaking preventer satisfies following (a) to (e): (a) said blood leaking preventer comprises first and second bulky portions which are formed at both ends of said hollow conduit, each of said first and second bulky portions having a diameter larger than that of non-bulky portion of the hollow conduit; (b) the bulky portions are disposed eccentrically with respect to a central axis of the hollow conduit; (c) a twist angle γ is within ±45 degrees, where the twist angle γ is a crossing angle made by a line m 1 and a line m 2 , where the line m 1 is an eccentric line which formed by connecting a central axis of the hollow conduit and a central axis of the first bulky portion, and the m 2 is an eccentric line which formed by connecting a central axis of the hollow conduit and a central axis of the second bulky portion; (d) an inserting angle α of the bulky portions is between 20 and 45 degrees; and (e) a retrieving angle α of the two circular bulky portions is between 19 and 45 degrees.