| 摘要 |
Several improvements are disclosed for a drug delivery pack (250a) with dry reagent (400) in a housing (300), each of which can be employed independentl y or in conjunction with others of the improvements. A novel spring (5) is provided with two spring columns (30, 40) extending in parallel between a spring top (10), and a spring bottom (20). The spring is particularly design ed for fitting within the housing and compacting a dry reagent bed, and a plung er mechanism to ratchet housing portions between two positions. In one position , a compression component adjacent the reagent bed is relatively un-compressed , such that it does not "set" over time. When the user is about to use the dru g delivery device, the plunger is slid to compress the compression component s o that it exerts pressure on the reagent bed. A similar sliding mechanism can also divert a stream of diluent through the housing from a priming path, whe re diluent bypasses the reagent bed, to a functional path passing through, and eroding the reagent bed.
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