Manufacture of plungers for medical syringes comprises forming plunger or its part through manufacturing a piston body and plunger body or its part using injection molding, and injecting plunger body or its part against piston body

摘要

Plungers (3) are manufactured by forming plunger or its part through manufacturing piston body (5), and plunger body (4) or its part using injection molding and injecting plunger body or its part against the piston body. The plunger consists of >= 2 parts, the longitudinal plunger body made of plastic, and piston body having plastic that is softer than the plastic of the plunger body. Independent claims are also included for: (a) a medical device (11) for manufacturing plungers for medical syringes comprising mold parts (12, 13, 14, 15) defining first and second mold impressions (16, 17) for forming the piston body and plunger body or its part, motion mechanism that makes it possible to move the mold parts in relation to one another and to position them differently in first and second positions, and injection mechanism to supply the plastic to be injected to the mold impressions; and (b) a syringe for medical purposes comprising cylinder body with outlet that is formed of a narrowed outlet part, and plunger working in conjunction with the cylinder body that is provided with a piston body and plunger body.