Component mixing syringe

摘要

A two component mixing syringe for mixing and then self-administering a pharmaceutical by injection. A first liquid component is contained within an annular volume between a pair of coaxial housings. A pair of sealing bands defines the upper and lower boundaries of the annular volume. The lower sealing band is located above an aperture communicating with the inner housing interior. A driving sleeve is mounted with a driving end resting on the upper sealing band, the sleeve being located in the annular space between the two housings. Downward motion of the sleeve forces the upper sealing band downwardly causing the liquid component to drive the lower seal downwards past the cross bore. Thereafter, the liquid is free to flow through the cross bore and mix with the second component in the interior of the inner housing element.