INTRAVASCULAR DEVICE WITH ENHANCED ONE-BEAM CUT PATTERN
Disclosed are intravascular devices having enhanced one-beam cut patterns. An elongated member includes a plurality of fenestrations that define a plurality of axially extending beams interspersed between a plurality of circumferentially extending rings. The beams are formed using a dual-pass cutting method in which a blade makes two, rotationally offset cutting passes at a given longitudinal location of the elongated member. The resulting beam has enhanced structure that avoids overly sharp edges and minimizes structural weak points.
1 . An intravascular device, comprising:
an elongated member extending between a proximal end and a distal end along a longitudinal axis, and having a plurality of fenestrations that define a plurality of axially extending beams and circumferentially extending rings in a one-beam cut pattern, wherein between each pair of adjacent circumferentially extending rings is disposed a single axially extending beam without other axially extending beams,
wherein at least one beam includes an interior surface, an exterior surface, and a pair of lateral surfaces, wherein the lateral surfaces, wherein the lateral surfaces are substantially planar,
wherein the at least one beam of the one-beam cut pattern has a shape resulting from cutting the stock material to a depth of 30% to 70% of the stock material diameter from a first angle, and cutting the stock material to a depth of 30% to 70% of the stock material diameter from a second angle, wherein the first angle and the second angle are 60 degrees to 120 degrees apart, and
wherein an angle formed between the interior surface and one or both of the lateral surfaces is less than 135 degrees.
2 . The device of claim 1 , wherein the angle formed between the interior surface and one or both of the lateral surfaces is between about 75 degrees and about 130 degrees.
3 . The device of claim 1 , wherein the angle formed between the interior surface and one or both of the lateral surfaces is between about 80 degrees and about 120 degrees.
4 . The device of claim 1 , wherein the elongated member is a tube structure.
5 . The device of claim 4 , further comprising a core disposed within the tube structure.
6 . The device of claim 4 , further comprising an inner tube disposed within the tube structure.
7 . The device of claim 4 , further comprising one or more coils disposed within the tube structure.
8 . The device of claim 1 , wherein the elongated member comprises a polymer.
9 . The device of claim 1 , wherein the rings and beams are encapsulated in a polymer.
10 . The device of claim 1 , wherein the elongated member comprises a nickel-titanium alloy.
11 . The device of claim 1 , wherein the elongated member comprises stainless steel.
12 . The device of claim 1 , wherein the elongated member is formed from two or more different materials.
13 . The device of claim 1 , wherein the at least one beam has a substantially uniform thickness across its circumferential length.
14 . The device of claim 1 , wherein an angle formed between the exterior surface and one or both lateral surfaces is greater than about 45 degrees.
15 . The device of claim 14 , wherein the angle formed between the exterior surface and one or both lateral surfaces is about 50 degrees to about 90 degrees.
16 . The device of claim 1 , wherein the intravascular device is a guidewire.
17 . The device of claim 1 , wherein the intravascular device is a catheter.
18 . An intravascular device, comprising:
an elongated member extending between a proximal end and a distal end along a longitudinal axis, and having a plurality of fenestrations that define a plurality of axially extending beams and circumferentially extending rings in a one-beam cut pattern, wherein between each pair of adjacent circumferentially extending rings is disposed a single axially extending beam without other axially extending beams,
wherein at least one beam includes an interior surface, an exterior surface, and a pair of lateral surfaces, wherein the lateral surfaces, wherein the lateral surfaces are substantially planar,
wherein the at least one beam of the one-beam cut pattern has a shape resulting from cutting the stock material to a depth of 30% to 70% of the stock material diameter from a first angle, and cutting the stock material to a depth of 30% to 70% of the stock material diameter from a second angle, wherein the first angle and the second angle are 60 degrees to 120 degrees apart,
wherein an angle formed between the interior surface and one or both of the lateral surfaces is between about 80 degrees and about 120 degrees, and
wherein an angle formed between the exterior surface and one or both lateral surfaces is greater than about 45 degrees.
19 . A method of manufacturing an intravascular device, the method comprising:
providing a piece of stock material;
passing a blade into the stock material to form a first cut in the stock material without passing completely through the stock material, the blade being oriented such that a cutting edge is substantially perpendicular to a longitudinal axis of the stock material;
retracting the blade;
rotating the stock material relative to the blade without longitudinally advancing the stock material relative to the blade; and
passing the blade into the stock material to form a second cut.
20 . The method of claim 19 , wherein the stock material is rotated relative to the blade by about 60 degrees to about 120 degrees, and wherein the first and second cuts are made by passing the blade into the stock material to a depth of about 30% to about 70% of the diameter of the stock material.