Osmotic delivery device having a two-way valve and...

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/00 (2006.01) F16K 17/30 (2006.01) G05D 7/01 (2006.01)

Patent

CA 2466816

An implantable, osmotically-driven delivery system having a dynamic, two-way valve (10) and self-adjusting, variable geometry fluid (1) flow channel. As pressure within the agent delivery system goes up, the fluid channel narrows, thereby restricting flow. At exceptionally high pressures, the valve can be designed to close altogether at the orifice or delivery end, or it can provide a minimal leak path so that a maximum fluid flow is never exceeded. At zero or very low pressures, the valve will close completely at the beneficial agent reservoir end, isolating the beneficial agent formulation from external fluid infiltration and thereby eliminating diffusion of external fluid into the beneficial agent formulation.

L'invention concerne système de distribution implantable, à entraînement osmotique comprenant une valve bidirectionnelle, à réglage automatique et à canal d'écoulement fluidique à géométrie variable. Lorsque la pression augmente dans le système de distribution d'agent, le canal fluidique se rétrécit, ce qui réduit l'écoulement. A des pressions exceptionnellement élevées, la valve peut être conçue de façon à se fermer complètement au niveau de l'orifice ou de l'extrémité de distribution, ou à laisser un passage de fuite minimum de sorte qu'un écoulement fluidique maximum n'est jamais dépassé. A des pressions basses ou nulles, la soupape se ferme complètement au niveau de l'extrémité du réservoir d'agent bénéfique, protégeant ainsi la formulation d'agent bénéfique contre une infiltration fluidique extérieure, ce qui empêche la diffusion d'un fluide extérieur dans ladite formulation d'agent bénéfique.

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