Patent ID: 6387078
Filing Date: 2002-05-14
Classification: A61M

Abstract:
An automatic mixing and injecting apparatus comprising:a. a housing having a cavity and a proximal and a distal end; b. a syringe assembly within the housing cavity, the syringe assembly further comprising: (1) a first chamber for holding a liquid; (2) a second chamber for holding a dry medicine, the second chamber disposed distally to the first chamber; the second chamber releasably sealed with respect to the first chamber; (3) a needle, the needle disposed distally of the second chamber; and, (4) a plunger; the plunger having a plunger shaft disposed proximally; the plunger being operable to force the liquid from the first chamber into the second chamber; (5) a spring-to-plunger coupling engaging the plunger shaft and the driver spring; (6) a splitter; the splitter attached to the housing distally to the spring-to-plunger coupling; the splitter further having a surface for engaging the spring-to-plunger coupling and forcing the spring-to-plunger coupling to disengage from the plunger shaft, thereby disengaging the driver spring from the syringe assembly; and, c. a driver spring within the housing, the driver spring engaging the plunger shaft, and operable when released to inject the needle and displace the liquid from the first chamber, through the second chamber and through the needle.