Abstract: A tray including a plurality of recesses, each recess being surrounded by a side wall, each recess having an upwardly extending post located therein, a plurality of protruding retaining members extending from the side wall, at least one cartridge placed over one of the posts, the cartridge being retained therein by the plurality of protruding retaining members, each cartridge being spaced from a bottom wall of the recess.

Abstract: An injector including: a housing having an exterior wall, with pairs of slots formed therein, each pair of slots being diametrically opposed to each other; a needle hub having an exterior wall and an interior wall extending interiorly across the exterior wall, forming upper and lower compartments; a first needle extending upwardly from the interior wall, into the upper compartment, a second needle extending downwardly from the interior wall into the lower compartment, the interior wall having an opening forming a fluid passageway; a first cartridge and a second cartridge, each having a plunger and a pierceable cap; a base member having a base bottom wall with a plunger wall extending upwardly therefrom. The first cartridge is inserted into the base member such that the plunger seats on the plunger rod, and the second cartridge is in the housing with the pierceable cap of the second cartridge facing the first needle.