Multi-layer cannula structure
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United States of America Patent
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Feb 19, 1991
Grant Date -
N/A
app pub date -
May 6, 1988
filing date -
May 6, 1988
priority date (Note) -
Expired
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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.
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