Auto-injector retainer and drug administration device

A drug administration device comprising:

• at least two auto injectors, each having a housing that has a cylindrical shape and houses a prefilled syringe and a gasket pushing mechanism;
• and
• an auto-injector retainer for use in simultaneous administration by the at least two auto-injectors, the auto-injector retainer comprising:
• a plurality of retaining units located in parallel, each retaining unit retaining a respective one of the auto-injectors, wherein:
• each of the retaining units comprises a casing that covers a proximal end of the housing of the respective auto-injector, and
• each casing comprises:
• a distal opening into which the proximal end of the housing of the respective auto-injector is insertable,
• a proximal wall abutting on or facing a proximal end face of the housing of the respective auto-injector, and
• a cylindrical peripheral wall that is elastically deformed and holds the proximal end of the housing housed in the casing by an elastic restoring force.

A drug administration method comprising:

• providing a drug administration device comprising:
• at least two auto injectors, each having a housing that has a cylindrical shape and houses a prefilled syringe and a gasket pushing mechanism, and
• an auto-injector retainer for use in simultaneous administration by the at least two auto-injectors, the auto-injector retainer comprising:
• a plurality of retaining units located in parallel, each retaining unit retaining a respective one of the auto-injectors, wherein:
• each of the retaining units comprises a casing that covers a proximal end of the housing of the respective auto-injector, and
• each casing comprises:
• a distal opening into which the proximal end of the housing of the respective auto-injector is insertable,
• a proximal wall abutting on or facing a proximal end face of the housing of the respective auto-injector, and
• a cylindrical peripheral wall that is elastically deformed and holds the proximal end of the housing housed in the casing by an elastic restoring force;
• and
• while the at least two auto-injectors are held by the auto-injector retainer, simultaneously administering medical liquids from the at least two auto-injectors.