Surgery – Instruments – Internal pressure applicator
Reexamination Certificate
2005-03-08
2005-03-08
Reip, David O. (Department: 3731)
Surgery
Instruments
Internal pressure applicator
C606S194000, C604S103090, C604S096010
Reexamination Certificate
active
06863678
ABSTRACT:
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.
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Lee Jeong S.
Wang Edwin
White Roseminda J.
Advanced Cardiovascular Systems Inc.
Davis D. Jacob
Fulwider Patton Lee & Utecht LLP
Reip David O.
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