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Automatic medicament ingredient mixing and injecting apparatus

  • US 4,689,042 A
  • Filed: 05/20/1985
  • Issued: 08/25/1987
  • Est. Priority Date: 05/20/1985
  • Status: Expired due to Term
First Claim
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1. An automatic injecting apparatus comprisingan outer housing assembly including therein first and second medicament ingredient containers,a hypodermic needle disposed within said outer housing assembly for movement from a storage position in a sterile condition outwardly of said outer housing assembly into the muscle tissue of a patient for passage of liquid medicament therethrough and into the muscle tissue of the patient,a first liquid medicament ingredient in said first container,a first piston mounted in said first container in a storage position in sealingly retaining relation with respect to said liquid medicament ingredient therein for movement from said storage postion relatively through said first container in a liquid medicament ingredient moving stroke,a second medicament ingredient in said second container,a second piston mounted in said second container for movement from a liquid medicament moving position through said second container in a liquid medicament discharging stroke,spring means disposed within said outer housing assembly in a storage position in a releasable stressed condition capable of being released twice, first to move through a first piston moving stroke causing said first piston to move through its liquid medicament ingredient moving stroke and second to move through a second piston moving stroke causing said second piston to move through its liquid medicament discharging stroke,first releasing means operable in response to a first predetermined manual actuating procedure for effecting the first release of the stressed condition of said spring means,means operable when said first piston is moved through its liquid medicament ingredient moving stroke by the first release of the stressed condition of said spring means for causing the first liquid medicament ingredient discharging from said first container to flow into said second container to mix with the second medicament ingredient contained therein to form liquid medicament, andsecond releasing means operable in response to a second predetermined manual actuating procedure for effecting the second release of the stressed condition of said spring means so as to cause said second piston to move through its liquid medicament discharging stroke during which said hypodermic needle is moved into the muscle tissue of the patient and the liquid medicament is moved through said needle into the muscle tissue of the patient.

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