Multi-layer cannula structure

Details Multi-layer cannula structure Multi-layer cannula structure

1988-05-06

1991-02-19

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604265, 604280, 128768, A61M 500

Patent

active

049940473

ABSTRACT:
A swellable cannula is formed of concentric inner and outer hydrophilic and substantially non-hydrophilic layer structures. The hydrophilic layer structure comprises at least 2/3rds of the cross-sectional area of the wall of the cannula. The substantially non-hydrophilic layer structure is either substantially water impermeable or allows water to pass through at a controlled rate. The substantially non-hydrophilic layer structure may also control the diffusion of medicaments. The cannula has controlled softenability and swellability characteristics.

REFERENCES:
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patent: 3861396 (1975-01-01), Vaillancourt et al.
patent: 4202880 (1980-05-01), Fildes et al.
patent: 4424305 (1984-01-01), Gould et al.
patent: 4459318 (1984-07-01), Hyans
patent: 4527293 (1985-07-01), Eckstein et al.
patent: 4596563 (1986-06-01), Pande
patent: 4668221 (1987-05-01), Luther
patent: 4798597 (1989-01-01), Vaillancourt
patent: 4846812 (1989-07-01), Walker et al.

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