Multi-layer cannula structure

Details Multi-layer cannula structure Multi-layer cannula structure

A - Human Necessities

61

M

128/127

A61M 25/00 (2006.01) A61L 29/00 (2006.01) A61L 29/06 (2006.01)

Patent

CA 1314454

- 29 - Abstract Of The Disclosure Multi-Layer Cannula Structure 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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