Accumulator for implantable pump
First Claim
1. An implantable infusion apparatus comprising:
- a rechargeable positive pressure infusate reservoir;
metering means receiving infusate from said reservoir and outputting a series of volume spikes, said metering means comprising first and second valves and an accumulator in fluid communication with each of said valves, said first valve positioned between said infusate reservoir and said accumulator and said second valve positioned between said accumulator and an outlet; and
said accumulator comprising a housing having an infusate chamber, a first diaphragm, a second chamber containing a transfer fluid and separated from said first chamber by said first diaphragm, a second diaphragm in contact with said transfer medium and, means to bias said second diaphragm for deflection toward said first diaphragm.
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Accused Products
Abstract
An accumulator for an implantable infusion system employs a pair of separated diaphragms movable in unison by a transfer fluid disposed therebetween. A first chamber receives infusate in metered amounts and dispenses the contents as a function of toggled valve operation. During filling, the first diaphragm deflects upward and by pressure transfer causes a corresponding deflection in the second diaphragm. The second diaphragm is biased by springs, gas under pressure or the like. Hence, when the outlet valve opens, the pressure differential across the diaphragm causes downward deflection. No mechanical stops are needed in the infusate chamber for the first diaphragm since its movement is controlled by the pressure differential across the second diaphragm.
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Citations
25 Claims
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1. An implantable infusion apparatus comprising:
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a rechargeable positive pressure infusate reservoir; metering means receiving infusate from said reservoir and outputting a series of volume spikes, said metering means comprising first and second valves and an accumulator in fluid communication with each of said valves, said first valve positioned between said infusate reservoir and said accumulator and said second valve positioned between said accumulator and an outlet; and said accumulator comprising a housing having an infusate chamber, a first diaphragm, a second chamber containing a transfer fluid and separated from said first chamber by said first diaphragm, a second diaphragm in contact with said transfer medium and, means to bias said second diaphragm for deflection toward said first diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An accumulator for an implantable infusion apparatus comprising:
a housing having an infusate chamber, a first diaphragm, a second chamber containing a transfer medium and separated from said first chamber by said first diaphragm, a second diaphragm in contact with said transfer medium, means to bias said second diaphragm for deflection toward said first diaphragm and, contact means apart from said infusate chamber to limit deflection of at least two surfaces of said first and second diaphragms. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
Specification