Process for the filing of a propellant chamber of a gas driven pump
First Claim
1. A process for the filling of a propellant chamber of a gas pressure driven implantable infusion pump with a fluid propellant, comprising the steps of:
- dividing a pumping chamber of the gas pressure driven pump into the propellant chamber and a liquid storage chamber,evacuating the propellant chamber of substantially all gases;
filling a pillow with the propellant, wherein the pillow is essentially permeable to and inert to the propellant;
inserting the pillow filled with the propellant in the propellant chamber; and
closing the propellant chamber.
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Accused Products
Abstract
A process for the filling of the pumping chamber of a gas pressure driven medicine pump. A pillow filled with the propellant is formed which consists of a material permeable to the propellant. The pillow filled with the propellant is inserted into the propellant chamber which is evacuated. Then, the propellant chamber is sealed gas tight. Subsequently, the propellant diffuses through the wall of the pillow into the propellant chamber. The process according to the invention offers the possibility of filling the pumping chamber in a simple manner without allowing the penetration of foreign gases.
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Citations
10 Claims
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1. A process for the filling of a propellant chamber of a gas pressure driven implantable infusion pump with a fluid propellant, comprising the steps of:
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dividing a pumping chamber of the gas pressure driven pump into the propellant chamber and a liquid storage chamber, evacuating the propellant chamber of substantially all gases; filling a pillow with the propellant, wherein the pillow is essentially permeable to and inert to the propellant; inserting the pillow filled with the propellant in the propellant chamber; and closing the propellant chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A gas pressure driven pump, in particular an implantable infusion pump, comprising:
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a pumping chamber, which is divided into a liquid storage chamber and a propellant chamber; and a pillow filled with propellant which is inserted into the propellant chamber wherein the pillow is permeable to and inert to the propellant. - View Dependent Claims (10)
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Specification