Non-reusable disposable syringe
First Claim
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1. A disposable and non-reusable syringe comprising:
- a cylinder having a front end and a rear end,a plunger rod movable within the cylinder, said plunger rod terminating in a piston,said piston moving forwardly in said cylinder to a forward dispense position,blocking means to prevent said piston from being retracted from said forward dispensing position after it is moved, said blocking means comprising a locking ring surrounding said plunger rod and being movable therewith, said locking ring being locked into a fixed position to maintain said piston in said forward dispensing position.
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Abstract
There is disclosed a disposable and non-reusable syringe which has its piston locked in its forward dispense position after it is used, and the plunger is pulled out from the piston if the plunger is sought to be retracted from the syringe. The non-reusable syringe is so constructed to prevent the piston from reengaging with the plunger, even if the plunger is retracted and sought to be reinserted.
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Citations
13 Claims
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1. A disposable and non-reusable syringe comprising:
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a cylinder having a front end and a rear end, a plunger rod movable within the cylinder, said plunger rod terminating in a piston, said piston moving forwardly in said cylinder to a forward dispense position, blocking means to prevent said piston from being retracted from said forward dispensing position after it is moved, said blocking means comprising a locking ring surrounding said plunger rod and being movable therewith, said locking ring being locked into a fixed position to maintain said piston in said forward dispensing position. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11, 12, 13)
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- 7. A disposable and non-reusable syringe as claimed in claim 7, wherein there are at least five projection members.
Specification