Multiple material dispensing with primary piston expressing bolus and secondary piston actuated by primary piston t express material from secondary reservoir

摘要

Primary piston 2 is actuated by a force generator 4,5 so as to express material 3 through an outlet that is sealed or plugged by bolus carried material 7. Following expression of the material 7 further movement of piston 2 causes material 3 to bear on one or more secondary pistons 110, 190, directly or indirectly, causing co-expression of materials in primary and secondary reservoirs 11, 9.