Passive shuttle metering device for implantable drug delivery system
First Claim
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1. An implantable delivery device comprising;
- a source of fluid under pressure,a conduit for fluid delivery,a metering element receiving fluid from said fluid source and delivering discrete fluid pulses to said conduit, said metering element comprising a housing having an inlet in fluid communication with said source, an outlet in fluid communication with said conduit and a cavity in said housing in fluid communication with said inlet and outlet, first movable means mounted in said cavity for movement relative to said inlet and said outlet and second movable means retained by said first movable means and movable relative to said outlet, said second movable means responsive to a pressure difference in said cavity for expelling fluid from said cavity into said outlet, and means to move said first movable means.
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Abstract
A fluid metering device useful in implantable drug delivery systems is coupled between a pressurized fluid source and an outlet conduit to provide discrete flow pulses at a predetermined rate. The metering device consists of a first movable member constrained within a housing and a second movable member retained in a cavity by the first. Alternate positioning of the first member simultaneously fills and empties the cavity in which the second resides, discharging fluid through the conduit. The first movable member can be a planar slider, an axially translatable cylinder or a rotatable cylinder. The second movable member may be a flat shuttle, a sliding bar or a diaphragm.
301 Citations
23 Claims
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1. An implantable delivery device comprising;
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a source of fluid under pressure, a conduit for fluid delivery, a metering element receiving fluid from said fluid source and delivering discrete fluid pulses to said conduit, said metering element comprising a housing having an inlet in fluid communication with said source, an outlet in fluid communication with said conduit and a cavity in said housing in fluid communication with said inlet and outlet, first movable means mounted in said cavity for movement relative to said inlet and said outlet and second movable means retained by said first movable means and movable relative to said outlet, said second movable means responsive to a pressure difference in said cavity for expelling fluid from said cavity into said outlet, and means to move said first movable means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable delivery device comprising;
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a source of fluid under pressure; a conduit for fluid delivery; a metering element receiving fluid from said fluid source and delivering discrete fluid pulses to said conduit; said metering element comprising a housing having an inlet in fluid communication with said source, an outlet in fluid communication with said conduit and a cavity in said housing in fluid communication with said inlet and outlet, first driven movable means mounted in said cavity adjacent said inlet and outlet, second movable means carried by said first movable means and movable relative to said outlet as a function of a pressure differential across said second means, and means to move said first movable means to positions opening and blocking said outlet, wherein by positioning said second means fluid from said source is admitted into said cavity and by subsequent movement of said second movable means relative to said outlet, a pulse of fluid is delivered into said conduit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification