Device for administering fluid drugs, in particular for infusion
First Claim
1. A method for the administration of a liquid medicinal preparation comprising the steps of:
- (a) providing a device for the continuous administration of a liquid medicinal preparation, said device having a body and a reservoir disposed in the body, and an elastic membrane surrounding at least a portion of the body;
(b) dilating the membrane by inserting fluid into the membrane;
(c) placing a medicinal preparation in said reservior;
(d) forcing the fluid through a capillary duct and onto a moving wall disposed in said reservoir by retracting the elastic membrane to administer the medicinal preparation from the reservoir.
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Accused Products
Abstract
The invention concerns a device and a process for administering a liquid g preparation, in particular by infusion, by implantation or percutaneously, at a given flow rate for relatively long period of time, using a technique involving the retractation of an elastic membrane. More specifically, using this technique, said drug preparation is placed in a tubular reservoir (13) where it is subjected to the action of at least one movable wall (112, 112a). The movable wall is displaced by the pressure of a hydraulic fluid (10), the entry of which is controlled by a capillary tube (4) fed with hydraulic fluid (10) under pressure by a hydraulic accumulator subject to the thrust of a previously dilated retractable elastic membrane (8).
76 Citations
18 Claims
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1. A method for the administration of a liquid medicinal preparation comprising the steps of:
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(a) providing a device for the continuous administration of a liquid medicinal preparation, said device having a body and a reservoir disposed in the body, and an elastic membrane surrounding at least a portion of the body; (b) dilating the membrane by inserting fluid into the membrane; (c) placing a medicinal preparation in said reservior; (d) forcing the fluid through a capillary duct and onto a moving wall disposed in said reservoir by retracting the elastic membrane to administer the medicinal preparation from the reservoir. - View Dependent Claims (2, 3, 4, 5, 18)
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6. A device for the continuous administration of a liquid medicinal preparation, comprising:
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(a) a cylindrical body having a recess hollowed out of the cylindrical body and open to the outside, the recess running along a longitudinal axis of the cylindrical body; (b) a reservoir having an administration site, the reservoir being disposed in the recess; (c) a retractable elastic membrane being fixed in a lock-tight manner to at least a portion of an outer surface of the cylindrical body; (d) a hydraulic accumulator which is driven by the elastic membrane and which comprises a hydraulic fluid which can be accommodated in a space, the space being situated between the elastic membrane which has been dilated by insertion of the fluid and an outer surface of the cylindrical body; (e) a capillary duct connected to the accumulator and supplied with the fluid by the accumulator; (f) a piston located downstream of the capillary duct and driven by the fluid coming from the capillary duct, the piston providing for a continuous transfer of the medicinal preparation contained in the reservoir through the administration site. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification