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AssigneeAdvanced Cardiovascular Systems, Inc.
InventorsJeong Lee, Edwin Wang, Roseminda White
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A catheter having an multilayered shaft section with a first layer formed of a polyimide first material and a second layer formed of a second material. In a presently preferred embodiment, the polyimide material is a thermoset polyimide. However, in alternative embodiments, a thermoplastic polyimide is used. The thermoset polyimide has a very high glass transition temperature (Tg) of approximately 400° C. (as measured by differential scanning calorimetry), and excellent dimensional stability at the processing temperature of polyamides commonly used in catheter components. As a result, during formation and assembly of the catheter, production of a thin polyimide layer with controlled dimensions is facilitated. The polyimide has a high modulus and provides a thin walled yet highly pushable shaft section, while the second layer provides kink resistance. In one embodiment, the second material is selected from the group consisting of a polyamide material and a polyurethane material.
A catheter, comprising an an elongated shaft defining a lumen and having at least a section thereof which is multilayered with a first layer of a polyimide first material, and a second layer of a second material having a lower Shore durometer hardness than the polyimide material and selected from the group consisting of a polyamide material and a polyurethane material, the second layer is not in whole or in part separated from the first layer by a braid or mesh reinforcement, and the second layer is in direct contact with a surface of the first layer around a circumference of the first layer, and the polyimide material is not fusion bondable to the polyamide or polyurethane material.
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A balloon catheter, comprising;
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A balloon catheter, comprising;
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Dependencies are inferred from the claim text.