Disposable syringe
AssigneeFirma Carl Freudenberg
InventorsHerbert Schumacher, Norbert Messner, Ernst Osen, Dirk Ecknig
Life of this patent
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Abstract
A disposable syringe for administering liquid medicinal agents to live animal or human subjects is disclosed. The syringe comprises a hollow cylinder, filled with a medicinal agent, with which an injection needle is attached. The cylinder surrounds a piston that can be moved by means of a piston rod towards the injection needle. The piston is produced from a thermoplastically processable rubber mixture and is delimited in the direction of the medicinal agent by a peripheral sealing lip that contacts the hollow cylinder and that can be deflected in the radial direction.
Claims14
A disposable syringe for administering liquid medicinal agents;
- comprising:
- a hollow cylinder having proximal and distal ends, said hollow cylinder being configured to receive a liquid;
- an injection needle located at the proximal end of the hollow cylinder;
- a piston made from a thermoplastically processable rubber mixture and being delimited in the proximal direction by a radially deflectable peripheral sealing lip, said piston being provided with a recess radially inside the sealing lip;
- and a piston rod, said piston being located at one end of the piston rod, said piston rod and said piston being configured to be slidable within the hollow cylinder so that the piston can be displaced by the piston rod within the hollow cylinder towards the injection needle at the proximal end of the cylinder;
- wherein the peripheral sealing lip on the piston contacts the hollow cylinder and is configured to be radially deformed so as to reduce the recess when driven by the piston rod towards the proximal end of the hollow cylinder.
Dependencies are inferred from the claim text.