| 摘要 |
The present invention relates to a flow restrictor arrangement suitable for the controlled transfer of fluid from a first compartment to a second compartment. More specifically, the invention relates to indicating means allowing a user to detect an operational state of a delivery device incorporating a flow restrictor. The present invention provides a delivery device comprising a housing, a first cavity containing a drive fluid, a flow restrictor comprising a flow channel, a second cavity in fluid communication with the first cavity through the flow channel, a drug reservoir having in a situation of use an outlet means, where the second cavity and the drug reservoir is arranged such that the volume of the drug reservoir diminishes when the volume of the second cavity increases. The delivery device further comprises drive means for expelling the drive fluid from the first to the second cavity through the flow restrictor, whereby drug is expelled from the drug reservoir through the outlet. In accordance with the invention, the housing comprises a transparent portion allowing the content of the second variable volume cavity or the flow restrictor to be viewed from outside the delivery device, wherein the drive fluid is coloured for easy visual verification of its presence in the second variable volume cavity or the flow restrictor. <IMAGE>
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