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US 6,616,640 B2Granted
Syringe with plunger anti-detachment mechanism
AssigneeNone recorded
InventorMarina Ling-Ko Chen
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AssigneeNone recorded
InventorMarina Ling-Ko Chen
Estimating the term…
A plunger anti-detachment mechanism incorporates with a syringe which includes a hollow barrel, a hollow needle held at one end of the hollow barrel, and a plunger adapted to coaxially travel through the barrel. The plunger anti-detachment mechanism includes at least a locking stopper radially extended on the barrel and at least a resilient arm, having a locking latch outwardly extended therefrom, radially extended from the plunger wherein the resilient arm is adapted to move from an unlocked position to a locked position. At the unlocked position, the locking latch is moved away from the locking stopper such that the plunger is capable of freely traveling through the barrel, and that at the locked position, the locking latch is extended to the locking stopper so as to block up an axial movement of the plunger with respect to the barrel and interlock the plunger with the barrel.
A syringe, comprising:
A syringe, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
1. Field of Invention
The present invention relates to syringes, and more particularly to a syringe with plunger anti-detachment mechanism which securely locks up the plunger in the hollow barrel after use for preventing the plunger detaching from the hollow barrel accidentally, so as to prevent the used needle from contacting with anybody.
2. Description of Related Arts
FIG. 1 is an exploded perspective view of a syringe with plunger anti-detachment mechanism according to a first preferred embodiment of the present invention.
FIG. 2 is a partial sectional view of the syringe, while it is filled with medicine, according to the above first preferred embodiment of the present invention, illustrating the hollow plunger in an unlocked position.
FIG. 3 is a partial sectional view of the syringe, while the medicine is ejected, according to the above first preferred embodiment of the present invention, illustrating the hollow plunger in an unlocked position.
Referring to FIGS. 1 to 4 of the drawings, a syringe 10 with plunger anti-detachment mechanism 80 according to a first preferred embodiment of the present invention is illustrated, which comprises a hollow barrel 20, a hollow needle 30, a mounting seat 60, a needle retraction arrangement 1, and a hollow plunger 70.
The hollow barrel 20 has an open end portion 21, a needle mounting portion 22, and a tubular needle hub 23 extending from the needle mounting portion 22 to provide a needle passageway 24 therethrough and an end shoulder 25 radially extended inwardly from a free end 221 of the needle mounting portion 22, as shown in FIGS. 1 and 2.
The hollow needle 30 has a tissue penetrating end 301 and a tip end 302 thereof affixed with a cylindrical tip head 31 which has a shallow ring groove 32 provided thereon, wherein the tip head 31 of the hollow needle 30 is disposed in the needle mounting portion 22 with the tissue penetrating end 31 penetrating through the needle passageway 24.
Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston: fully automatic needle retraction, i.e. in which…
Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe: for blocking the piston
Having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile: means for preventing re-use by disrupting…
Devices for delivering substances into the body
Term ended 1 Feb 2022 (estimated)