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US 9,918,857 B2Granted
Scaffold having a shaped strut and methods for shaping scaffold struts
AssigneeAbbott Cardiovascular Systems Inc.
InventorsJamey Jacobs, Stephen Pacetti
Life of this patent
Estimating the term…
Abstract
A scaffold strut is shaped to improve hemocompatibility. After laser cutting, the scaffold is placed on a work piece and its struts are shaped by flame polishing or brushing. The abluminal surfaces and luminal surfaces can have corners rounded. The strut can have a sloped surface on its luminal side without reducing strut thickness needed for strength.
Claims13
A medical device, comprising:
- a balloon catheter including a balloon located at a distal end and a distal tip;
- and
- a polymer scaffold crimped to the balloon, the scaffold having a pattern of shaped struts, wherein a shaped strut has a leading edge, a trailing edge, a luminal surface facing a surface of the balloon and an abluminal surface facing away from the balloon surface;
- wherein the shaped strut is, in respect to a cross-section of the strut, asymmetric about each of two orthogonal axes passing through a centroid of the strut cross-section;
- and
- wherein the shaped strut further includes a linear or non-linear taper from the leading to the trailing edge thereof such that a strut thickness at the trailing edge is less than the strut thickness at the leading edge;
- and
- wherein the shaped strut leading edge is located a first distance from the distal tip, the shaped strut trailing edge is located a second distance from the distal tip, and the first distance is greater than the second distance.
5 more elements
A medical device, comprising:
- a balloon catheter including a balloon, a distal end and a distal tip;
- and
- a scaffold crimped to the balloon, wherein the scaffold is made from a tube and the tube is substantially or completely made from a blend of polylactide (PLA) and a PLA and polycaprolactone (PCL) random copolymer (e.g., 5-30% PCL) and the blended PLA-PCL combination has between about 1% to 8% by weight PCL;
- the scaffold including a shaped strut, wherein the shaped strut has a leading edge, a trailing edge, a luminal surface facing a surface of the balloon and an abluminal surface facing away from the balloon surface;
- wherein a cross-section of the shaped strut is asymmetric about each of two orthogonal axes passing through a centroid of the strut cross-section, such that a strut thickness at the trailing edge is between 30% and 80% of the strut thickness at the leading edge;
- wherein the shaped strut leading edge is located a first distance from the distal tip, the shaped strut trailing edge is located a second distance from the distal tip, and the first distance is greater than the second distance.
3 more elements
A medical device, comprising:
- a balloon catheter including a balloon, a distal end and a distal tip;
- and
- a scaffold crimped to the balloon, wherein the scaffold is made from a tube having a wall thickness, and the tube is substantially or completely made from a blend of polylactide (PLA) and a PLA and polycaprolactone (PCL) random copolymer (e.g., 5-30% PCL) and the blended PLA-PCL combination has between about 1% to 8% by weight PCL;
- and
- the scaffold further comprising ring elements formed by struts connected at strut junctions, the struts including shaped struts located at the strut junctions, wherein a shaped strut comprises a leading edge, a trailing edge, a luminal surface facing a surface of the balloon and an abluminal surface facing away from the balloon surface, the shaped strut further comprising:
- a cross-section asymmetric about each of two orthogonal axes passing through a centroid of the cross-section,
- a leading edge thickness between 70% to 95% of the wall thickness,
- a trailing edge thickness between 30% and 60% of the wall thickness,
- a radius of curvature for a corner of a luminal surface is about 4 times higher than a radius of curvature for a corner of an abluminal surface;
- and wherein the shaped strut leading edge is located a first distance from the distal tip, the shaped strut trailing edge is located a second distance from the distal tip, and the first diameter is greater than the second distance.
7 more elements
Dependencies are inferred from the claim text.