EP-AI-No. 0059694 describes a drug administration device for releasing a drug into a flow of liquid during administration by a parenteral route to a patient, such device comprising a cell having an inlet and outlet for the liquid so as to permit the liquid to flow through the cell, the cell containing a solid drug-releasing unit positioned to contact the liquid flowing through the cell in use, the drug releasing unit being adapted to release the drug at a controlled rate into the liquid. Such device is gaining interest as a valuable new concept in intravenous infusion therapy i.a. The present inventors have found that by an improvement to such device substantial advantages can be gained, and further employment in extended therapeutical fields can be made possible.
EP-AI-No. 0077604 and GB-A-No. 2107191 describe further devices for drug release to a liquid for parenteral administration.