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US 9,908,297 B2Granted
Scaffolds having variable wall thickness
AssigneeAbbott Cardiovascular Systems Inc.
InventorsStephen D. Pacetti, Chad J. Abunassar, Diem U. Ta, Richard J. Rapoza
Life of this patent
Estimating the term…
Abstract
A scaffold strut is shaped to improve hemocompatibility. The scaffold is made from a tube having variable wall thickness. Methods are disclosed for modifying the thickness of the tube in such a way as to achieve a reduced hemodynamic profile, but without significantly affecting strength properties in areas where stress concentrations exist when the scaffold is loaded.
Claims20
A medical device, comprising:
- a tubular body made from a polymer material, the tubular body having one of an undulating inner wall surface and an undulating outer wall surface such that a ratio of a maximum wall thickness (t-max) to a minimum wall thickness (t-min) for the tubular body is between 2 and 1.2;
- wherein the one of an undulating inner wall surface and an undulating outer wall surface comprises a curved surface that repeats every 20, 30, or 45 degrees about a circumference of the tubular body;
- wherein the tubular body is a scaffold having interconnected elements comprising a first ring connected to a second ring by a link;
- and
- wherein the first ring and the second ring have crowns interconnected by struts.
2 more elements
A medical device, comprising:
- a scaffold made from a polymer material and having interconnected elements, the scaffold made from a polymer material and having interconnected elements, the scaffold having one of an undulating inner wall surface and an undulating outer wall surface such that a ratio of a maximum wall thickness (t-max) to a minimum wall thickness (t-min) for the scaffold is between 2 and 1.2;
- wherein the one of an undulating inner wall surface and an undulating outer wall surface comprises a curved surface that repeats every 180 degrees about a circumference of the scaffold;
- the interconnected elements comprising:
- a first ring connected to a second ring by a first link and a second link,
- the second ring connected to a third ring by a third link and a fourth link,
- the first link and the second link are separated by 180 degrees and each hold a radiopaque marker, and
- the first link and the second link have the wall thickness t-max, and the third link and the fourth link have the wall thickness t-min.
4 more elements
A medical device, comprising:
- a tubular body made from a polymer material, the tubular body having one of an undulating inner wall surface and an undulating outer wall surface such that a ratio of a maximum wall thickness (t-max) to a minimum wall thickness (t-min) for the tubular body is between 2 and 1.2;
- wherein the tubular body is a scaffold, comprising:
- a first ring, a second ring and a third ring, each of the rings having a number of crowns (NC) interconnected by struts,
- each of the struts of the first ring, second ring and third ring comprise the t-min wall thickness,
- each of the crowns of the first ring, second ring and third ring comprise the t-max wall thickness, and
- when viewed in cross section the one of an undulating inner wall surface and an undulating outer wall surface repeats every 360/NC degrees about a circumference of the scaffold.
3 more elements
Dependencies are inferred from the claim text.