United States Patent [19] [11] Patent Number: 4,861,335
Reynolds [45] Date of Patent: Aug. 29, 1989
[54] SYRINGE
[75] Inventor: David L. Reynolds, Montreal, Canada
[73] Assignee: Duoject Medical Systems Inc., Montreal, Canada
[21] Appl. No.: 18,934
[22] Filed: Feb. 25, 1987
Related U.S. Application Data
[63] Continuation-in-part of Ser. No. 759,432, Jul. 26, 1985, abandoned.
[51] Int. Q.4 A61M3/00
[52] U.S. CI 604/88; 604/191
[58] Field of Search 604/87, 88, 82, 56,
604/89-92, 191, 413, 414, 416; 222/80
[56] References Cited
U.S. PATENT DOCUMENTS
2,684,068 7/1954 Orens 604/88
3,477,432 11/1969 Shaw 604/91
3,489,147 1/1970 Shaw 604/88
3,636,950 1/1972 Gomez et al 604/88
3,724,460 4/1973 Gomez et al 604/88
4,171,698 10/1979 Genese 604/88
4,405,317 9/1983 Case 604/90
4,581,016 4/1986 Gettig 604/92
Primary Examiner—Stephen C. Pellegrino
Assistant Examiner—Ralph Lewis
Attorney, Agent, or Firm—Ridout & Maybee
[57] ABSTRACT
A syringe provides for the isolated storage of two components of a medicament until immediately prior to use of the syringe. One liquid component is stored in a collapsible chamber of a sealed capsule within a hollow plunger stem of the syringe, and the other component beneath the head of the plunger. A double headed needle arrangement between the head and stem of the plunger is caused to penetrate the plunger head and the capsule when the syringe is to be used so that the plunger may be drawn back to exhaust the contents of the capsule chamber into admixture with the component stored beneath the head of the plunger. Communication through the double headed needle arrangement is then interrupted before the plunger is used to eject the syringe contents through an external needle fitted to the syringe.
IS Claims, 6 Drawing Sheets
