Syringe for one sole use
First Claim
1. A single use hypodermic syringe, comprising,a cylinder having a tip which includes a fluid outlet opening,a piston which is movable in the cylinder to expel liquid through the fluid outlet opening,a pusher for pushing the piston forwardly toward the fluid outlet opening, said pusher having a first part that is shorter than the piston and is detachably connected to the piston, said pusher having a second part that is long enough to move the piston to the end of the cylinder, andmeans for detachably connecting said pusher to the piston so that said piston will not move when the pusher moves rearwardly.
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Accused Products
Abstract
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 joined to a pusher which inside the cylinder of the syringe does not reach the end, as there has to be provided a second pusher situated preferably in the centerof same which separates the piston of the pusher resting the piston at the interior end of the syringe, and the pusher free. 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.
36 Citations
8 Claims
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1. A single use hypodermic syringe, comprising,
a cylinder having a tip which includes a fluid outlet opening, a piston which is movable in the cylinder to expel liquid through the fluid outlet opening, a pusher for pushing the piston forwardly toward the fluid outlet opening, said pusher having a first part that is shorter than the piston and is detachably connected to the piston, said pusher having a second part that is long enough to move the piston to the end of the cylinder, and means for detachably connecting said pusher to the piston so that said piston will not move when the pusher moves rearwardly.
Specification