Elongate medical device having enhanced torque and methods thereof
First Claim
1. 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, andwherein the third connection is disposed at a longitudinal position that maximizes the torsional stiffness.
1 Assignment
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Accused Products
Abstract
An elongate medical device such as a guidewire, that may comprise a first elongate member having a proximal end, a distal end and a lumen there between, a second elongate member having a proximal end and a distal end, the second elongate member at least partially disposed in the first elongate member, a first connection between first elongate member and the second elongate member at the proximal end of the first elongate member, a second connection between the first elongate member and the second elongate member at the distal end of the first elongate member, and a third connection between the first elongate member and the second elongate member, the third connection disposed at a point between the first connection and the second connection, wherein the third connection is substantially at a location selected by the Method for Enhancing the Ratio of Torsional Stiffness to Transverse Flexibility.
396 Citations
46 Claims
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1. An intravascular medical device having a longitudinal axis, the device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An elongate medical device, comprising:
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a first elongate member having a proximal end, a distal end and a lumen there between; a second elongate member having a proximal end and a distal end, the second elongate member at least partially disposed in the first elongate member; a first connection between first elongate member and the second elongate member proximate the proximal end of the first elongate member; a second connection between the first elongate member and the second elongate member proximate the distal end of the first elongate member; and a third connection between the first elongate member and the second elongate member, the third connection disposed between the first and second connections, 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 is within 10% of the first elongate member portion length of a point that maximizes the torsional stiffness. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An elongate medical device, comprising:
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a first elongate member having a proximal end, a distal end and a lumen there between; a second elongate member having a proximal end and a distal end, the second elongate member at least partially disposed in the first elongate member; a first connection between first elongate member and the second elongate member proximate the proximal end of the first elongate member; a second connection between the first elongate member and the second elongate member proximate the distal end of the first elongate member; and a third connection between the first elongate member and the second elongate member, the third connection disposed at a point that maximizes torsional stiffness of the first and second elongate members, wherein the third connection comprises a collar fixed to the second elongate member at the third connection point and an insert fixed to the first elongate member at the third connection point, the insert defining an open space in which the collar is disposed and through which the collar may move longitudinally but in which the collar is restrained from rotating about a longitudinal axis relative to the insert. - View Dependent Claims (46)
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Specification