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An injector for co-axial-type dispensers for multiple flowable components is provided. The dispenser has a multi-chamber cartridge with a first outlet for a first flowable component arranged within a second outlet for a second flowable component. The injector includes an inner sleeve for fitting eng

An injector for co-axial-type dispensers for multiple flowable components is provided. The dispenser has a multi-chamber cartridge with a first outlet for a first flowable component arranged within a second outlet for a second flowable component. The injector includes an inner sleeve for fitting engagement with an inner wall of the first outlet of the dispenser, wherein an interior of the inner sleeve defines a first passage for the first flowable component; and an outer sleeve for fitting engagement with an outer wall of the first outlet of the dispenser.

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1. An injector for a dispenser for multiple flowable components, the dispenser having a multi-chamber cartridge with a first outlet for a first flowable component arranged within a second outlet for a second flowable component, the injector comprising: an inner sleeve for fitting engagement with an

1. An injector for a dispenser for multiple flowable components, the dispenser having a multi-chamber cartridge with a first outlet for a first flowable component arranged within a second outlet for a second flowable component, the injector comprising: an inner sleeve for fitting engagement with an inner wall of the first outlet of the dispenser, wherein an interior of the inner sleeve defines a first passage for the first flowable component;wherein a distal end of the first passage comprises at least one injector outlet hole; andwherein the injector outlet hole is sized to restrict backflow of the second flowable component into the first passage, wherein the injector outlet hole has a diameter in the range of 0.005″ to 0.100″. 2. An injector according to claim 1 wherein the injector outlet hole has a diameter in the range of 0.010″ to 0.035″. 3. An injector according to claim 1 wherein the injector outlet hole widens in the direction away from the first passage. 4. An injector according to claim 1 wherein the injector outlet hole is oriented radially outward. 5. An injector according to claim 1 wherein a distance from the injector outlet hole to a proximal end of the inner sleeve is at least double a diameter of the first outlet. 6. An injector according to claim 1 wherein the inner sleeve is sized to displace a sufficient volume of the first flowable component within the first outlet to prevent overflow of the first flowable component from the first outlet when an extended-length storage plug is inserted into the first outlet. 7. An injector according to claim 1 wherein the distal end of the first passage comprises a plurality of the injector outlet holes. 8. An injector according to claim 1 wherein a wall thickness of the inner sleeve is sized to provide simultaneous flow of the first flowable component and the second flowable component into a mixing chamber of the dispenser at a predetermined mixing ratio. 9. An injector according to claim 1 further comprising an outer sleeve for fitting engagement with an outer wall of the first outlet of the dispenser, wherein the outer sleeve and the inner sleeve are coupled. 10. An injector according to claim 9 wherein an exterior of the outer sleeve partially defines a second passage for the second flowable component. 11. An injector according to claim 10 wherein wall thicknesses of the inner sleeve and/or the outer sleeve are sized to provide simultaneous flow of the first flowable component and the second flowable component through the first passage and the second passage respectively into a mixing chamber of the dispenser at a predetermined mixing ratio. 12. An injector according to claim 1 wherein the distal end of the first passage is hemispherical. 13. An injector according to claim 1 comprising an inverted frustoconical element disposed distal of the injector outlet hole and proximal of a static mixer of the dispenser. 14. An injector according to claim 13 wherein the frustoconical element is molded integrally with the injector, molded integrally with the static mixer, or provided as a separate piece from the injector and the static mixer. 15. An injector according to claim 9 wherein the outer sleeve comprises a plurality of radially arranged ridges, wherein spaces between the ridges partially define the second passage. 16. An injector according to claim 15 wherein an outer wall of the ridges comprise a locking element for interlocking with a locking element on an inner wall of a mixer housing of the dispenser. 17. An injector according to claim 9 wherein a proximal end of the outer sleeve comprises an outwardly radiating flange for abutment against an inner wall of the second outlet, wherein the flange comprises a plurality of cutouts. 18. A mixing assembly comprising: a static mixer; andan injector according to claim 1. 19. A dispenser comprising: a multi-chamber cartridge comprising a plurality of outlets;a static mixer; andan injector according to claim 1. 20. A dispenser according to claim 19 wherein the static mixer and the injector are spaced apart to define a mixing chamber therebetween.