Safety hypodermic syringe with retractable needle
First Claim
Patent Images
1. A safety hypodermic syringe comprising:
- (A) a hollow barrel for containing a fluid, having a rear end opening and a front end opening;
(B) a hollow needle extending through the front end opening of the barrel to permit fluid from the barrel to be injected through the needle;
(C) mounting means temporarily securing the needle within the front end of the barrel with the needle protruding forwardly from the front end opening of the barrel until an injection given by the needle has been completed;
(D) a hollow plunger containing an axial chamber therein which is large enough to receive the needle and mounting means therein, the plunger having a front end inserted through the rear end opening of the barrel and being slideable longitudinally within said barrel to move inwardly when pressure is applied to an outwardly extending rear end of the plunger, the front end of the plunger being open for communication between the axial chamber and the interior of the barrel except when the end is initially covered by an end cover which temporarily seals the chamber of the plunger until the plunger is depressed a sufficient distance to complete the injection of fluid from the chamber through the needle;
(E) means removing the end cover from the front end of the plunger;
(F) means moving the needle rearwardly out of the front end opening of the barrel with at least part of the mounting means and into a stored position within the hollow plunger; and
(G) means to retain the needle and mounting means in the stored position to prevent the needle from protruding from the front end of the barrel.
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Accused Products
Abstract
A syringe for giving medical injections which has an internal mechanism for retracting the needle into the syringe after the injection has been given and locking the needle and plunger inside the barrel of the syringe to reduce the risk of accidental needle pricks. In one embodiment the needle is manually retracted by pulling back on the plunger and in the other embodiment the needle is propelled by a compressed spring into a hollow chamber within the plunger.
223 Citations
29 Claims
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1. A safety hypodermic syringe comprising:
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(A) a hollow barrel for containing a fluid, having a rear end opening and a front end opening; (B) a hollow needle extending through the front end opening of the barrel to permit fluid from the barrel to be injected through the needle; (C) mounting means temporarily securing the needle within the front end of the barrel with the needle protruding forwardly from the front end opening of the barrel until an injection given by the needle has been completed; (D) a hollow plunger containing an axial chamber therein which is large enough to receive the needle and mounting means therein, the plunger having a front end inserted through the rear end opening of the barrel and being slideable longitudinally within said barrel to move inwardly when pressure is applied to an outwardly extending rear end of the plunger, the front end of the plunger being open for communication between the axial chamber and the interior of the barrel except when the end is initially covered by an end cover which temporarily seals the chamber of the plunger until the plunger is depressed a sufficient distance to complete the injection of fluid from the chamber through the needle; (E) means removing the end cover from the front end of the plunger; (F) means moving the needle rearwardly out of the front end opening of the barrel with at least part of the mounting means and into a stored position within the hollow plunger; and (G) means to retain the needle and mounting means in the stored position to prevent the needle from protruding from the front end of the barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A safety hypodermic syringe comprising:
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(A) a hollow barrel for containing a fluid, having a rear end opening and a front end opening of smaller diameter than the rear end opening; (B) a needle assembly having a hollow needle with a front and rear end and a head portion attached to the needle at the rear end thereof; (C) separable means temporarily mounting the needle assembly in the front end of the barrel with the front end of the needle protruding forwardly through the front end opening of the barrel in a ready position for injection of fluid from the barrel and the rear end of the needle and the head portion extending into the barrel at the front end thereof, said hollow needle providing communication between the inside and outside of the barrel; (D) a hollow plunger containing an axial chamber therein which is large enough to receive the needle assembly therein and having a front end thereof inserted through the rear end opening of the barrel and being longitudinally slideable within said barrel to move inwardly when pressure is applied to an outwardly extending rear end of the plunger, the front end of the plunger being open for communication with the interior of the barrel except when the end is initially covered by a removeable end cover which temporarily seals the chamber of the plunger until the plunger is depressed a sufficient distance to inject fluid from the chamber through the needle; (E) means removing the end cover from the front end of the plunger; (F) means withdrawing the needle assembly and separable means from sealing engagement with the front end opening of the barrel and moving the needle assembly and yieldable means into the barrel and into a retracted position within the axial chamber of the plunger; (G) means closing the front end opening of the barrel after withdrawal of the needle assembly into the barrel to prevent the needle from protruding from the front of the barrel; and (H) means locking the plunger in the depressed position within the barrel after the needle assembly has been stored in the chamber of the plunger. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A safety hypodermic syringe comprising:
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(A) a hollow barrel for containing a fluid, having a rear end opening and a separable needle mounting means integral with the front end thereof for temporarily securing a hollow needle within the front end of the barrel with the needle protruding forwardly from the front end of the barrel until an injection given by the needle has been completed; (B) a hollow plunger containing an axial chamber therein which is large enough to receive the needle and mounting means therein, the plunger having a front end inserted through the rear end opening of the barrel and being slideable longitudinally within said barrel to move inwardly when pressure is applied to an outwardly extending rear end of the plunger, the front end of the plunger being open for communication between the axial chamber and the interior of the barrel except when the end is initially covered by an end cover which temporarily seals the chamber of the plunger until the plunger is depressed a sufficient distance to complete the injection of fluid from the chamber through the needle; (C) a front end closure cap secured to the front end of the barrel enclosing the needle mounting means and having a central opening therein through which the needle projects forwardwardly therefrom; (D) means removing the end cover from the front end of the plunger; (E) means separating the needle mounting means from the front end of the barrel; (F) means moving the needle rearwardly from the front end of the barrel with at least part of the mounting means and into a stored position within the hollow plunger; and (G) means to retain the needle and mounting means in the stored position to prevent the needle from protruding from the front of the barrel.
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Specification