초록 ▼

An implantable medication infusion device wherein a generally cylindrical manifold is employed having a shallow recess on one face thereof. A flexible diaphragm is positioned to form with the face of said manifold a medication reservoir. A circular cover member is positioned over the diaphragm to fo

An implantable medication infusion device wherein a generally cylindrical manifold is employed having a shallow recess on one face thereof. A flexible diaphragm is positioned to form with the face of said manifold a medication reservoir. A circular cover member is positioned over the diaphragm to form with said diaphragm a pressure stabilizing chamber within which is positioned a two-phase fluid for maintaining a constant pressure on said diaphragm. A permanent magnet is positioned at the center of said diaphragm and is movable therewith. A Hall effect transducer positioned on said manifold opposite said permanent magnet is employed continuously to measure the position of said diaphragm and provide an indication of the amount of medication in said reservoir. A method of filling and sealing the pressure stabilizing chamber which insures that a small bubble of two-phase fluid is present in said chamber at all times. An inlet filter is positioned between the medication reservoir and an inlet check valve to act as a bubble trap during the intake stroke of a pulsatile pumping unit also mounted in the manifold.

대표청구항 ▼

An implantable medication infusion unit, comprising a flat generally disc shaped manifold having a shallow recess on one face thereof, a flexible circular diaphragm secured at its periphery to the edge of said recess to form with said one face of said manifold a medication reservoir, means accessibl

An implantable medication infusion unit, comprising a flat generally disc shaped manifold having a shallow recess on one face thereof, a flexible circular diaphragm secured at its periphery to the edge of said recess to form with said one face of said manifold a medication reservoir, means accessible from the exterior of said unit through a first penetrable septum mounted in the other face of said manifold for filling said medication reservoir, said last named means including a fill check valve, a pulsatile pumping unit mounted in said manifold and including an inlet check valve mounted in said manifold, a second penetrable septum mounted in said manifold, means defining a chamber beneath said second penetrable septum, and a passage in said manifold interconnecting said chamber and said reservoir, whereby the space between said fill check valve and said inlet check valve may be evacuated through said penetrable second septum.