Patent classifications
A
HUMAN NECESSITIES
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A61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
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A61M
DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
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5/00
Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
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A61M5/32
Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
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A61M5/3205
Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
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A61M5/321
Means for protection against accidental injuries by used needles
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A61M5/322
Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
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A61M5/3221
Constructional features thereof, e.g. to improve manipulation or functioning
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A61M2005/3227
the needle being retracted laterally outside the syringe barrel, e.g. with separate guideway
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A61M2005/3227

Dual chamber syringe with retractable needle
12290669 · 2025-05-06 · ·

Embodiments of a retractable syringe assembly are provided that include a dual syringe barrel configuration. One or more embodiments include reuse prevention features and features that prevent premature activation of the retraction mechanism. Methods for aspirating and expelling liquid from medical devices are also provided.