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US 2017/0028616 A1Published application
Methods for crimping a polymeric stent onto a delivery balloon
AssigneeAbbott Cardiovascular Systems Inc.
InventorsKevin F. Jow, Arlene Sucy Yang, JR., Yunbing Wang, Kathleen W. Yan
Life of this patent
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Abstract
A medical device-includes a polymer stent crimped to a catheter having an expansion balloon. The stent is crimped to the balloon by a process that includes heating the stent to a temperature below the polymer's glass transition temperature to improve stent retention without adversely affecting the mechanical characteristics of the stent when later deployed to support a body lumen.
Claims21
1-20. (canceled)
A method for making a medical device, comprising:
- providing a tube from a polymer comprising poly(L-lactide), the polymer having a glass transition temperature (Tg);
- forming a scaffolding from the tube, the scaffolding comprising:
- ring structures, each ring structure forming a plurality of diamond-shaped cells,
- linking struts that connect adjacent ring structures, and
- an outer diameter;
- and
- using a crimping device having a crimp head, crimping the scaffolding to a balloon of a balloon catheter, the crimping including the steps of:
- raising the temperature of the scaffolding to an elevated temperature between Tg and 15 degrees below Tg,
- reducing the crimp head to a crimped diameter to reduce the scaffolding's outer diameter from a first size to a second size,
- holding the crimp head at the crimped diameter for a dwell period, and
- reducing elastic recoil in the scaffolding including placing the scaffolding within a sheath.
8 more elements
A method for making a medical device, comprising:
- forming a tube from a polymer comprising poly(L-lactide), the tube having a tube diameter;
- forming a scaffolding from the tube, the scaffolding comprising:
- ring structures, each ring structure forming a plurality of diamond-shaped cells,
- linking struts that connect adjacent ring structures, and
- an outer diameter;
- and
- using a crimping device having a crimp head, crimping the scaffolding to a balloon of a balloon catheter, wherein the balloon has an inflated diameter that is equal to, or less than the tube diameter, the crimping including the steps of:
- increasing a retention between the scaffolding and the balloon by raising the temperature of the scaffolding to an elevated temperature between 40 Degrees Celsius and 55 Degrees Celsius,
- reducing the crimp head to a crimped diameter to reduce the scaffolding's outer diameter from a first size to a second size,
- holding the crimp head at the crimped diameter for a dwell period.
7 more elements
A method for making a medical device, comprising the steps of:
- using a scaffolding, comprising:
- ring structures, each ring structure forming a plurality of diamond-shaped cells,
- linking struts that connect adjacent ring structures, and
- an outer diameter,
- wherein the scaffolding is made from a polymer tube, the polymer having a glass transition temperature (Tg);
- and
- using a crimping device having a crimp head, crimping the scaffolding to a balloon of a balloon catheter, the crimping including the steps of:
- increasing a retention between the scaffolding and the balloon by raising the temperature of the scaffolding to an elevated temperature between Tg and 15 degrees below Tg,
- reducing the crimp head to a crimped diameter,
- holding the crimp head at the crimped diameter for a dwell period while the scaffolding has the elevated temperature, and
- reducing elastic recoil in the scaffolding including placing the scaffolding within a sheath while the scaffolding outer diameter has about the crimped diameter.
8 more elements
Dependencies are inferred from the claim text.