Self-driven pump assembly and method of operation
First Claim
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1. A pump assembly for the delivery of a quantity of fluid over a prolonged period of time comprising, in combination:
- (a) fluid imbibing pump means for discharging a predetermined volume of fluid, said pump means having an external surface at least a portion of which is permeable to an actuating fluid,(b) fluid impermeable container means receiving said fluid imbibing pump means in fluid sealing relationship with the exterior surface thereof, whereby a fluid receiving volume is defined between the actuating fluid permeable portion of the exterior surface of said fluid imbibing pump means and the interior of said container means and;
(c) means for adjustably varying the area of the actuating fluid permeable portion of said fluid imbibing pump means exposed to actuating fluid contained within said container means.
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Abstract
A pump assembly particularly useful as an infusor for parenteral administration of a small amount of a therapeutically active substance for a prolonged period of time at a substantially constant rate comprising a fluid imbibing pump mounted within a receptacle into which actuating fluid may be charged. The active agent is dispensed from the pump after the pump is exposed to the fluid. Means to vary or stop the pump by obdurating all or a portion of the exterior surface of the pump can also be provided. Variation in flow rates can also be obtained by changing the composition of the actuating fluid.
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Citations
11 Claims
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1. A pump assembly for the delivery of a quantity of fluid over a prolonged period of time comprising, in combination:
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(a) fluid imbibing pump means for discharging a predetermined volume of fluid, said pump means having an external surface at least a portion of which is permeable to an actuating fluid, (b) fluid impermeable container means receiving said fluid imbibing pump means in fluid sealing relationship with the exterior surface thereof, whereby a fluid receiving volume is defined between the actuating fluid permeable portion of the exterior surface of said fluid imbibing pump means and the interior of said container means and; (c) means for adjustably varying the area of the actuating fluid permeable portion of said fluid imbibing pump means exposed to actuating fluid contained within said container means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification