Patent ID: 7875001

Claim:
A nasal spray apparatus for simultaneously introducing at least two medicaments having incompatible properties into a user's nasal cavity, the nasal spray apparatus comprising: a spray nozzle configured for insertion of medicaments into a user's nasal cavity; two separate chambers for storing each of the two medicaments; a receptacle separate from the spray nozzle between the spray nozzle and the separate chambers in which the two medicaments first mix before being injected through the spray nozzle into the user's nasal cavity; two separate piston pumps for pumping each of the two medicaments from the separate chambers to the receptacle, the piston pumps and receptacle being configured so that medicaments having incompatible properties are mixed in prescribed concentrations immediately prior to injection through the spray nozzle into the user's nasal cavity, check valves positioned between the piston pumps and the receptacle, each check valve including a head that is shiftable into the receptacle to open the check valve, wherein the receptacle comprises a common receptacle located between the two separate piston pumps and the spray nozzle in which the at least two medicaments are first mixed, the common receptacle having a volume less than the volume of individual spray pumps so that only a relatively small volume of mixed medicaments can be retained in the receptacle after injection of metered doses of medications into the user's nasal cavity.