| 摘要 |
THE INVENTION DESCRIBES AN INJECTION DEVICE (1) FOR USE ONCE ONLY, COMPRISING A SYRINGE CYLINDER (2) FOR RECEIVING A LIQUID MEDIUM, AN INJECTION NEEDLE (6), A MOVABLE PISTON (4) POSITIONED IN THE INNER CHAMBER OF THE SYRINGE CYLINDER (2), WHICH IS MOTIONALLY COUPLED TO A PISTON ROD (5) EXTENDING FROM SAID PISTON IN THE OPPOSITE DIRECTION OF THE INJECTION NEEDLE (6). FURTHERMORE, IT HAS AN ORIGINALITY SAFEGUARD DEVICE (7) ACTUATED BY THE MEDIUM MOVED WITH THE PISTON (4), WHICH IS ARRANGED IN AN INLET REGION (37) OF THE SYRINGE CYLINDER (2) FACING TOWARDS THE INJECTION NEEDLE (6) AND PRESENTS A SWITCHING UNIT (22) WITH A SEALING SECTION (48) HAVING A GREATER CROSS-SECTION SURFACE THAN THE PASSAGE CROSS-SECTION OF AN OPENING (33) IN A RETAINING MEMBER (21) AND ITS SEALING SECTION (48) BEING KEPT IN NEUTRAL POSITION, WITH THE ANNULAR RETAINING MEMBER (21) LOCATED ON THE SIDE OF SAID RETAINING MEMBER FACING TOWARDS THE PISTON (4) AND ELASTICALLY DEFORMABLE IN A RADIAL DIRECTION OR IN THE DIRECTION OF THE INJECTION NEEDLE (6). IN A LOCKED POSITION OF THE SWITCHING UNIT (22), THE SEALING SECTION (49 IS LOCATED ON THE SIDE OF THE RETAINING MEMBER (21) FACING TOWARDS THE INJECTION NEEDLE (6) WHICH IS FORMED AS A SEALING STOP (48) FOR THE SWITCHING UNIT (22) IN THE DIRECTION OF THE PISTON (4). A RECEIVING CHAMBER FOR THE SWITCHING UNIT (22) OR ITS SEALING SECTION (48) IS ARRANGED BETWEEN THE RETAINING MEMBER (21) AND THE INJECTION NEEDLE (6). THE RETAINING MEMBER (21) IS PRODUCED FROM AN ELASTICALLY RETURNABLE MATERIAL AND IS KEPT IN POSITION OR MOULDED TO A HOUSING (18) OF THE ORIGINALITY SAFEGUARD DEVICE (7) INSERTED IN THE INNER CHAMBER (3) OF THE SYRINGE CYLINDER (2) , WHICH CONSISTS OF A HARDER MATERIAL THAN THAT OF THE RETAINING MEMBER (21). THE SWITCHING UNIT (22) PRESENTS ADJACENT TO THE SEALING SECTION (48) A GUIDING ELEMENT (23) WHICH IS GUIDED IN A GUIDE TRACK (49) OF THE HOUSING (18) OR IN THE SYRINGE CYLINDER (2), WHEREBY A GUIDING LENGTH BETWEEN THE GUIDING ELEMENT (23) AND THE GUIDE TRACK (49) IS GREATER THAN AT LEAST ONE LENGTH BETWEEN THE NEUTRAL AND THE LOCKED POSITION OF THE SWITCHING UNIT (22). (FIG.2)
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