Method and arrangements in aseptic preparation
A first aspect of the invention relates to a method for aseptic preparation with an injection syringe. The syringe comprises a container for injection agent and an immovable connection nozzle connected to the container. The method entails charging the container with air. According to the invention air is forced to pass through an air filter arranged on the connection nozzle. This enables the syringe container to be charged with aseptic air in a simple and reliable fashion. Other aspects of the invention relate to devices for performing the method, viz. an injection syringe equipped with an air filter in the connection nozzle, a filter unit ( 2 ) connectable to an injection syringe's ( 1 ) connection nozzle ( 13 ) and a system comprising an injection syringe ( 1 ) and a separate filter unit ( 2 ). The invention devices convey advantages of the same kind as the invention method.
1. A method for antiseptic preparation by means of a liquid injection syringe, said liquid injection syringe comprising a container for a liquid injection agent and an immovable connection nozzle attached to the container, the method including the sequential steps of:
mounting an air filter on the connection nozzle,
charging the container with air,
removing the air filter from the connection nozzle,
connecting the connection nozzle to a vessel containing a liquid injection agent via a separate coupling means to provide an air-tight connection between the connection nozzle and the vessel,
forcing the air from the container into the vessel, and
thereafter, while the connection nozzle is maintained connected to the vessel, drawing liquid injection agent from the vessel into the container, wherein charging the container with air causes air to pass through the connection nozzle and the air filter mounted on the connection nozzle.
2. The method according to claim 1 , wherein a separate filter unit is attached to the connection nozzle before the container is charged with air.
3. The method according to claim 1 , wherein a cannula of the coupling means is forced to penetrate a coupling means membrane and a vessel membrane in order to establish an airtight connection between the injection agent container and the vessel.
4. The method according to claim 1 , wherein the volume of the vessel changes, after the vessel is connected to the injection syringe, in order to achieve pressure equalization in the vessel as air is forced into the vessel and/or injection agent is withdrawn from the vessel.
5. The method according to claim 1 , wherein a separate coupling means is attached to the connection nozzle such that during charging of the container with air, air passes through the air filter into the coupling means and from the coupling means through the connection nozzle into the container, whereafter the coupling means is connected to a vessel containing the injection agent.