Wet/dry automatic injector assembly

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/28 (2006.01) A61M 5/20 (2006.01)

Patent

CA 2542204

An automatic medicament injector having a compartment for a dry medicament component and a compartment for a wet medicament component. The two compartments are separated by a seal structure that has a plug that is moved from a sealing position into a mixing position when the device is activated. The seal structure includes a wiper that scrapes the interior walls in the dry component compartment to prevent the dry component from accumulating at the seal/glass interface. A tapered insert "funnels" the mixed medicament components to an attached needle assembly, but can be removed when the device is filled. A filter is provided between the medicament compartments and the needle assembly. A chamber between the filter and the needle assembly allows for better flow through the filter. An actuation assembly drives the plug into the mixing position and forces the mixed medicament through the needle and into the user.

L'invention concerne un injecteur automatique de médicaments comprenant un compartiment destiné à un composant médicamenteux sec et un compartiment destiné à un composant médicamenteux humide. Ces deux compartiments sont séparés par une structure de scellement qui comprend un obturateur passant d'une position de scellement à une position de mélange lorsque le dispositif est activé. Cette structure de scellement comprend un racleur qui racle les parois intérieures dans le compartiment destiné au composant médicamenteux sec afin d'empêcher que ce dernier ne s'accumule au niveau de l'interface joint/verre. Un élément rapporté conique faisant office d'entonnoir amène les composants mélangés vers un ensemble aiguille annexe et peut être enlevé lorsque le dispositif est rempli. Un filtre est disposé entre les compartiments destinés aux composants médicamenteux et l'ensemble aiguille. Une chambre située entre le filtre et l'ensemble aiguille facilite l'écoulement à travers le filtre. Un ensemble d'actionnement place l'obturateur dans la position de mélange et force le médicament mélangé à passer par l'aiguille et à être injecté dans l'utilisateur.

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