[54] NON-REUSABLE SYRINGE
[75] Inventors: Alan H. Polyblank, 1/401 New South Head Road, Double Bay, NWS 2028, Australia; Alexander S. Richardson, West Ryde, Australia
[73] Assignee: Alan H. Polyblank, Double Bay, Australia
[21] Appl. No.: 924,947
[22] Filed: Aug. 5,1992
[30] Foreign Application Priority Data
Feb. 15, 1990 [AU] Australia PJ8666
Dec. 10, 1990 [AU] Australia PK3819
Aug. 5, 1991 [AU] Australia PK7588
[51] Int. CI.' A61M 5/00
[52] U.S. a 604/110; 604/218
[58] Field of Search 604/110, 187, 218, 220
[56] References Cited
U.S. PATENT DOCUMENTS
4,731,068 3/1988 Hesse 604/110
FOREIGN PATENT DOCUMENTS
5877990 1/1991 Australia .
0360329 3/1990 European Pat. Off. A61M 5/50
0376697 7/1990 European Pat. Off. A61M 5/50
2181580 12/1973 France A61M 5/00
8802640 4/1988 PCT Int'l Appl. .
8904187 5/1989 PCT Int'l Appl. .
9004424 5/1990 PCT Int'l Appl. .
9112039 8/1991 PCT Int'l Appl. .
2220143 1/1990 United Kingdom A61M 5/315
Primary Examiner—John D. Yasko
Attorney, Agent, or Firm—Rothwell, Figg, Ernst & Kurz
[57] ABSTRACT
A syringe device (10) which is not reusable after the first delivery stroke. The syringe has a hollow body (11) slidably containing a plunger (12) in fluid sealing relationship. The plunger (12) has a plunger rod (13) which includes a guide arrangement (17) receiving and guiding a locking member (18). The guide arrangement (17) is adapted to maintain the locking member (18) in an unengaged position relative to the body (11) when the plunger (12) is moved in the direction of a first intake stroke and in a first delivery stroke, and allows relative sliding movement and consequential pivoting movement of the locking member (18) such that, upon commencement of a second intake stroke, the locking member (18) snaggingly engages the inside surface of the body (11) to resist further movement of the plunger (12) in the intake stroke direction. Accordingly, in use, the locking member (18) interacts with the guide arrangement (17) of the plunger (12) and the inside surface of the body (11) so as to allow a first intake stroke and a delivery stroke, but to prevent a second intake stroke of the plunger (12). The syringe device (10) may also allow for aspiration testing, and may have a plunger rod (113) which has two interacting parts (113A, 113B).
11 Claims, 13 Drawing Sheets
