| 摘要 |
<p>The object of the present invention is a syringe the essential function of which is to avoid that it is used again after having been used once. This is achieved by means of a piston (2) detachably joined to a pusher (3). The length of pusher (3) is such that at its maximum insertion there is a free space between the piston (2) and the syringe distal end. A second pusher (4), preferably within a centre bore of the pusher (3), disconnects the piston (2) from the pusher (3) for completing injection, leaving the piston (2) inoperative at the distal end of the syringe. In order to avoid that the end joined to the needle be manipulated, there can be provided a fixed needle, or either a channel between the cylinder and the corkscrew needle, impossible to be manipulated.</p> |
