Osmotic pump with self-retaining, fast-start membrane plug

Details Osmotic pump with self-retaining, fast-start membrane plug Osmotic pump with self-retaining, fast-start membrane plug

2004-10-20

2008-08-05

Sirmons, Kevin C. (Department: 3767)

Surgery

Controlled release therapeutic device or system

Osmotic or diffusion pumped device or system

C604S890100, C424S422000

Reexamination Certificate

active

07407499

ABSTRACT:
An osmotic pump includes a capsule having at least one delivery port formed at a first end and a membrane plug retained in a second end of the capsule remote from the delivery port to provide a fluid-permeable barrier between an interior and an exterior of the capsule. The membrane plug has a columnar body and at least one slot formed in the columnar body to vent pressure from the interior to the exterior of the capsule when the columnar body extends a predetermined distance relative to the second end of the capsule, thereby preventing expulsion of the membrane plug from the second end.

REFERENCES:
patent: 3025991 (1962-03-01), Gillon
patent: 4969884 (1990-11-01), Yum
patent: 5985305 (1999-11-01), Peery et al.
patent: 6113938 (2000-09-01), Chen
patent: 6270787 (2001-08-01), Ayer
patent: 6287295 (2001-09-01), Chen et al.
patent: 6524305 (2003-02-01), Peterson et al.
patent: WO 99/04767 (1999-02-01), None
patent: WO 99/33449 (1999-07-01), None

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