Multi-reservoir implantable pump with variable flow rate capabilities
First Claim
Patent Images
1. An implantable device for dispensing an active substance to a patient comprising:
- a propellant chamber defined by a first flexible membrane and a second flexible membrane, the first and second flexible membranes attached to each other to entirely surround the propellant chamber;
a first active substance chamber separated from said propellant chamber by the first flexible membrane;
a second active substance chamber separated from said propellant chamber by the second flexible membrane;
an outlet in fluid communication with said first and second active substance chambers;
a first replenishment opening in fluid communication with said first active substance chamber and a first septum sealing the first replenishment opening; and
a second replenishment opening in fluid communication with said second active substance chamber and a second septum sealing the second replenishment opening.
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Abstract
A multiple reservoir or chambered implantable pumps is disclosed. The pump according to the present invention is particularly useful in allowing for multiple constant flow rates to be provided from an otherwise constant flow implantable pump. The pump is also useful in allowing for housing of multiple active substances. A multiple reservoir implantable pump is also disclosed, which has at least one chamber capable of providing a constant flow rate and at least one chamber capable of being utilized for patient controlled injections.
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Citations
25 Claims
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1. An implantable device for dispensing an active substance to a patient comprising:
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a propellant chamber defined by a first flexible membrane and a second flexible membrane, the first and second flexible membranes attached to each other to entirely surround the propellant chamber; a first active substance chamber separated from said propellant chamber by the first flexible membrane; a second active substance chamber separated from said propellant chamber by the second flexible membrane; an outlet in fluid communication with said first and second active substance chambers; a first replenishment opening in fluid communication with said first active substance chamber and a first septum sealing the first replenishment opening; and a second replenishment opening in fluid communication with said second active substance chamber and a second septum sealing the second replenishment opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable pump comprising:
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a housing and two flexible membranes disposed within said housing, said housing and said two flexible membranes defining at least first, second, and third chambers, said housing further including a first replenishment opening fluid communication with said first chamber and a first septum sealing first replenishment opening, and a second replenishment opening in fluid communication with said second chamber and a second septum sealing the second replenishment opening; and an outlet in fluid communication with at least said first and second chambers, wherein said two flexible membranes are attached to each other to entirely surround said third chamber and said third chamber contains a propellant capable of expanding isobarically. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An implantable pump comprising:
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a housing having first and second portions; a first flexible membrane captured between said first and second portions; a second flexible membrane captured between said first and second portions; a first chamber defined by said first portion of said housing and said first flexible membrane; a second chamber defined by said second portion said housing and said second flexible membrane; a third chamber defined solely by said first and second flexible membranes; an outlet in fluid communication with said first and second chambers, wherein said housing further includes a first replenishment opening in fluid communication with said first chamber and a first septum sealing the first replenishment opening, and a second replenishment opening in fluid communication with said second chamber and a second septum sealing the first replenishment opening. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification