Implantable infusion system with a neutral pressure medication container
First Claim
1. An implantable infusion system comprising:
- a housing adapted for implantation in a patient;
a neutral pressure medication supply container disposed in aid housing for containing liquid medication to be administered to said patient, at least a portion of said medication container being flexible so that said container has a volume which changes dependent on an amount of medication contained in aid medication container;
a catheter connected to an exterior of said housing and adapted for implantation in the body of said patient with a tip of said catheter disposed at a medication delivery site;
pumping means, disposed in aid housing and connecting an interior of said medication container to said catheter for pumping medication from said medication container to said catheter; and
means for defining a closed space in which said medication container is disposed, said means for defining a closed space having a volume at least partially contained in said housing, and having a flexible wall portion means exposed to an exterior of said housing, for causing the volume of said closed space to change by a corresponding amount when the volume of said medication container changes for maintaining a pressure acting on said supply container substantially constant.
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Accused Products
Abstract
An implantable infusion system has a neutral pressure medication supply container for liquid medication to be delivered to the patient, the supply container being devised so that its volume changes according to the amount of medication it contains, and a pump for pumping medication from the supply container, via a catheter, to the patient'"'"'s body. The supply container and the pump are arranged inside an enclosure to which the catheter is connectable at the output of the pump. A closed space, at least partly contained inside the enclosure, in which the supply container is arranged, and in which essentially atmospheric pressure prevails, is arranged to change its volume to a corresponding degree when the volume of the supply container changes, so that the pressure is kept essentially unchanged.
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Citations
35 Claims
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1. An implantable infusion system comprising:
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a housing adapted for implantation in a patient; a neutral pressure medication supply container disposed in aid housing for containing liquid medication to be administered to said patient, at least a portion of said medication container being flexible so that said container has a volume which changes dependent on an amount of medication contained in aid medication container; a catheter connected to an exterior of said housing and adapted for implantation in the body of said patient with a tip of said catheter disposed at a medication delivery site; pumping means, disposed in aid housing and connecting an interior of said medication container to said catheter for pumping medication from said medication container to said catheter; and means for defining a closed space in which said medication container is disposed, said means for defining a closed space having a volume at least partially contained in said housing, and having a flexible wall portion means exposed to an exterior of said housing, for causing the volume of said closed space to change by a corresponding amount when the volume of said medication container changes for maintaining a pressure acting on said supply container substantially constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification