Trilayer, extruded medical tubing and medical devices incorporating such tubing
AssigneeSchneider (USA) Inc.
InventorsChristine M. Samuelson, Sarah J. Krieger
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Abstract
The present invention provides a length of trilayer, extruded, medical tubing comprising an outer layer, a core layer, and an intermediate tie layer. The outer layer comprises a polymer that is directly bondable, while the core layer comprises a lubricious polymer. The core layer thus defines a lumen that exhibits the desired characteristics, i.e., low friction for the advancement of a guidewire or catheter through the lumen without comprising the strength and stiffness that is desirable in tubing that is to be used in medical devices. Additionally, the tubing is easily coextruded and yet, is not subject to delamination, thus providing the added advantage of providing a reduction in the overall cost of manufacture.
Claims42
A length of coextruded, flexible tubing suitable for use in a medical device comprising:
- an outer layer comprising a directly bondable polymer having a first glass transition temperature;
- a core layer defining a lumen extending through the length of tubing, said core layer comprising a lubricious polymer, said core layer having a third glass transition temperature;
- and
- an intermediate tie layer comprising a functionalized polymer having a second glass transition temperature;
- wherein the first, second and third glass transition temperatures are within 85% to 115% of the glass transition of the layer or layers adjacent thereto.
A length of coextruded, flexible tubing suitable for use in a medical device comprising:
- an outer layer comprising a directly bondable polymer selected from the group consisting of polyesters, polyamides, or combinations thereof;
- a core layer defining a lumen extending through the length of tubing, said core layer comprising a lubricious polymer;
- and
- an intermediate tie layer comprising a functionalized polymer.
- a core layer defining a lumen extending through the length of tubing, said core layer comprising a lubricious polymer, said core layer having a third glass transition temperature;
- and
- an intermediate tie layer comprising a functionalized polymer.
A medical device adapted for percutaneous transluminal use comprising:
- a length of coextruded, tubing comprising:
- an outer layer comprising a directly bondable polymer having a first glass transition temperature;
- a core layer defining a lumen extending through the length of tubing, said core layer comprising a lubricious polymer, said core layer having a third transition temperature, and
- an intermediate tie layer comprising a functionalized polymer having a second glass transition temperature,
- wherein the first, second and third glass transition temperatures are within 85% to 115% of the glass transition of the layer or layers adjacent thereto;
- and
- a radially expansive component coupled to the length of tubing.
Dependencies are inferred from the claim text.