Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1985-10-10
1987-08-04
Pellegrino, Stephen C.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604413, A61M 516, A61J 100
Patent
active
046843655
ABSTRACT:
A refill unit for a negative pressure type implanted infusion device includes a hollow cylindrical housing member which is adapted to receive at one end a bottle of vacuum conditioned medication. As the bottle is inserted first and second needles or tubes penetrate the closure member of the bottle, the shorter one of these needles being positioned to receive medication inside the bottle and the longer one extends into the ullage space of the bottle when it is inserted and held vertically. The shorter needle communicates with a refill needle, which extends downwardly from the other end of the cylindrical member, through a membrane type filter which is hydrophilic to the medication and has a micron rating such that the filter once it is wetted can pass air bubbles but only at a differential pressure substantially greater than the negative pressure differential of the implanted device. The longer needle communicates with ambient air through a membrane type filter which is hydrophobic to the medication and permits the unobstructed flow of air into the ullage space of the bottle while preventing air-borne bacteria from entering this air space.
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Eaton Corporation
Pellegrino Stephen C.
Rowe D. A.
Vande Zande L. G.
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