Patent ID: 8105246

Claim:
An intravascular medical device having a longitudinal axis, the device comprising: a first elongate member having a first end, a second end, a length, and a lumen disposed between the first and second end; a second elongate member disposed in the lumen of the first elongate member; a first connection between the first elongate member and the second elongate member proximate the first end; a second connection between the first elongate member and the second elongate member proximate the second end, the first and second connections being spaced apart by a distance; and a third connection between the first and second elongate members, wherein the first elongate member has a portion that extends from the first connection to the second connection, the first elongate member portion having a length that extends from the first connection to the second connection, a shear modulus and a polar moment of inertia, wherein the second elongate member has a portion that extends from the first connection to the second connection, the second elongate member portion having a length that extends from the first connection to the second connection, a shear modulus and a polar moment of inertia, wherein the elongate member has a torsional stiffness that is a function of the lengths, shear moduli and polar moments of inertia of the first and second elongate member portions, and wherein the third connection is disposed at a longitudinal position that maximizes the torsional stiffness.