SYRINGES AND SYRINGE SYSTEMS FOR SELECTIVELY DISPENSING CONTROLLED AMOUNTS OF A THERAPEUTIC SUBSTANCE

摘要

A syringe may include various forms of a releasable stop adapted to selectively limit the travel of the syringe plunger within the syringe barre l such that a first amount of therapeutic substance may be discharged from the syringe while a residual supply of the therapeutic substance remains in the syringe. Movement of the plunger is permitted to displace the residual suppl y of fluid from the barrel. Syringes according to the invention find particula r application as diluent syringes in a wet/dry drug delivery syringe system having two cooperating syringe barrels in which the residual supply of dilue nt in the diluent syringe may be used to flush additional and otherwise wasted drug from a drug syringe barrel.