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Introducer sheath assembly

  • US 4,634,432 A
  • Filed: 05/13/1985
  • Issued: 01/06/1987
  • Est. Priority Date: 05/13/1985
  • Status: Expired due to Fees
First Claim
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1. A flexible tube for the introduction of catheters and like devices into a vascular system, comprising:

  • a helical coiled spring having a plurality of coils, each of a plurality of said coils being spaced from at least one adjacent coil; and

    a thin cylindrical wall prepared from a protective coating composition completely surrounding said spring to define an inner wall surface and an outer wall surface, the portion of said cylindrical wall surrounding each of said coils having a first thickness and the portion of said cylindrical wall between said spaced coils having a second, smaller thickness, with said inner and outer wall surfaces being indented thereat;

    said coating composition comprising a thermoplastic polymeric material dissolved in a solvent solution, said composition having a solids content ranging from about 4% to about 18%, and said solution comprising a solvent selected from the group consisting of tetrahydrofuran, dioxane, methyl ethyl ketone, dimethylformamide, cyclohexane, and mixtures thereof.

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