[54] INJECTION DEVICE
[75] Inventors: Peter Michel, Burgdorf; Fritz Kirchhofer, Sumiswald, both of Switzerland
[73] Assignee: Medimpex Ets., Balzers, Liechtenstein
[21] Appl. No.: 133,108
[22] PCT Filed: Feb. 12,1993
[86] PCT No.: PCT/CH93/00037
§ 371 Date: Oct. 13,1993
§ 102(e) Date: Oct. 13,1993 [87] PCT Pub. No.: WO93/16740
PCT Pub. Date: Sep. 2,1993
[30] Foreign Application Priority Data
Feb. 21, 1992 [CH] Switzerland 0053492-3
[51] Int. CI.* A61M 5/00
[52] U.S. Q 604/207; 604/232
[58] Field of Search 604/207, 208, 209, 210,
604/211, 218, 232, 187
[56] References Cited
U.S. PATENT DOCUMENTS
4,973,318 11/1990 Holm et al 604/208
5,017,190 5/1991 Simon et al 604/207
5,292,318 3/1994 Haber et al 604/207 X
5,295,976 3/1994 Harris 604/211
5,304,152 4/1994 Sams 604/207
Primary Examiner—John D. Yasko
Attorney, Agent, or Firm—Walter C. Farley
[57] ABSTRACT
The invention concerns an injection device (1) receiving in exchangeable manner an ampoule (4) with a plunger (5) and an injection needle (6). It further comprises an actuation means (7) essentially consisting of an operating head (8), a drive element (11), a guide element (24) and an output member (9,19) preferably in the form of a rod (9) and flange (19). The output member is nonrotatably affixed to the guide element (11) itself rigidly mounted inside the device (1) and seated by its own thread in an internal thread (27) of the drive element (11) which can be displaced axially and into rotation by the manual operating head (8). When rotating the operating head (8), the output member (9, 19) is advanced and in the process forces forward the plunger (5), the result being injection. The stationary guide element (24) of the disclosed device is located axially ahead of the axially displaceable drive element (11). Accordingly the length of the actuation system (7) is shorter than in state-of-the-art injection devices, whereby a larger maximum dose can be injected with a device (1) of the same length. The device (1) is applicable in medicine.
8 Claims, 4 Drawing Sheets
