Device for sustained release of active substance

Details Device for sustained release of active substance Device for sustained release of active substance

1990-02-07

1990-11-27

Cannon, Alan W.

Surgery

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

Treating material introduced into or removed from body...

604 49, 604 55, 424424, A61M 3100

Patent

active

049733044

ABSTRACT:
A device for the sustained release of active substance comprises a wall defining a cavity for the reception of active substance, the wall being of impermeable material and having one or more ports therethrough. Sections of hydrogel material are within the cavity, the hydrogel, in use, being swollen to cover the ports in the cavity wall. Active ingredient is released from the container only through the hydrogel covering the ports. In this way sustained and controlled release of the active substance from the device is obtained.

REFERENCES:
patent: 3093831 (1963-06-01), Jordan
patent: 3796217 (1974-03-01), Arien
patent: 3896806 (1975-07-01), Wichterle
patent: 3946734 (1976-03-01), Dedrick et al.
patent: 3971376 (1976-07-01), Wichterle
patent: 4220153 (1980-09-01), Dresback
patent: 4814182 (1989-03-01), Graham et al.
Hacth's Chemical Dictionary, 4th Ed., McGraw-Hill, Inc., 1969, pp. 293,332.
132,384, European Patent Application, published July 30, 1985.

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