United States Patent  [li] Patent Number: 4,755,169
Sarnoff et al.  Date of Patent: Jul. 5, 1988
 AUTOMATIC MEDICAMENT INGREDIENT MIXING AND INJECTING APPARATUS
 Inventors: Stanley J. Sarnoff; William R.
Tarello, both of Bethesda; Claudio
Lopez, Silver Spring, all of Md.;
Daniel M. Karcher, Great Falls, Va.
 Assignee: Survival Technology, Inc., Bethesda, Md.
 Appl. No.: 943,135
 Filed: Dec. 18,1986
Related U.S. Application Data
 Division of Ser. No. 735,995, May 20, 1985, Pat. No. 4,689,042.
 Int. a* A61M5/00
 U.S. CI 604/51; 604/89;
604/136; 604/191; 604/157
 Field of Search 604/82, 85-89,
604/90-92, 135, 136, 139, 148, 157, 51, 191
 References Cited
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An automatic injector apparatus comprising an outer housing assembly, a hypodermic needle, first and second containers, a first liquid medicament ingredient in the first container and a second medicament ingredient in the second container, first and second pistons in the first and second containers respectively, a releasable stressed spring arrangement capable of being released twice, once for movement through a first piston moving stroke and second through a second piston moving stroke, a first releasing device operable in response to a first predetermined actuating procedure for accomplishing a first release of the spring arrangement so as to effect movement of the first piston through a liquid medicament ingredient moving stroke causing the liquid medicament ingredient to mix with the medicament ingredient in the second container to form liquid medicament and a second releasing device operable in response to a second actuating procedure for accomplishing a second release of the spring arrangement so as to effect movement of the second piston through an operative stroke causing the hypodermic needle to be moved into the muscle tissue of the patient and the liquid medicament to be moved through the needle into the muscle tissue of the patient.
12 Claims, 8 Drawing Sheets