SAFETY MEDICAL SYRINGE WITH RETRACTABLE NEEDLE
A syringe (20) for giving medical injections which has an internal mechanism for releasing, and retracting a needle (60) into the syringe after the injection has been given and retaining the needle, and a hollow plunger (30) inside the barrel of the syringe to reduce the risk of accidental needle st...
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Format: | Patent |
Sprache: | eng ; fre |
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Zusammenfassung: | A syringe (20) for giving medical injections which has an internal mechanism for releasing, and retracting a needle (60) into the syringe after the injection has been given and retaining the needle, and a hollow plunger (30) inside the barrel of the syringe to reduce the risk of accidental needle sticks. The interior of the hollow plunger is initially hydraulically sealed off by a plunger front end wall (44) from the fluid chamber of the syringe t o prevent fluid from entering the interior of the hollow plunger. After the plunger has been depressed to expel fluid from the barrel, further depressio n of the plunger causes cutting punch type members to sever a disc shaped flan ge portion of a stem type needle retaining member and the plunger front end wal l thereby permitting the spring to propel the needle, and needle retaining member into the hollow plunger thereby retracting the needle and retaining member inside the barrel. |
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