Improvements in and relating to a medicament delivery device

Details Improvements in and relating to a medicament delivery device Improvements in and relating to a medicament delivery device

A - Human Necessities

61

M

A61M 5/145 (2006.01) A61M 5/315 (2006.01) A61M 5/168 (2006.01)

Patent

CA 2474619

The present invention relates to a medicament delivery device such as a pen type injector used to expel medicament from a medicament cartridge under the action of a lead screw. The medicament cartridge typically comprises a cylinder having a displaceable piston at one end displacement causing medicament contained within the cartridge to be expelled. It is of advantage to know when the plunger contacts the displaceable piston since no delivery of medicament can occur before this point. A delivery device is disclosed in which a lead screw (2) for a medicament delivery device comprises a shaft portion (8) and a head portion (10), the head portion (10) further comprising a fixed part (18), a displaceable part (20) movable with respect to the fixed part, biasing means acting normally to urge the displaceable part (20) away from the fixed part (18) and a sensor (40) to detect when the displaceable part moves towards the fixed part, one of the fixed part and the displaceable part being provided with a plurality of resilient fingers (22) extending axially with respect to the lead screw, and the other of the fixed part and the displaceable part being provided with a plurality of openings (32), each of the resilient fingers extending within a corresponding opening.

L'invention concerne un dispositif d'administration de médicament tel qu'un injecteur de type stylo servant à expulser un médicament d'une cartouche par l'action d'une vis-mère. Cette cartouche de médicament comprend en règle générale un cylindre doté d'un piston mobile, à une extrémité duquel le déplacement provoque l'expulsion du médicament contenu dans la cartouche. Selon l'invention, il est intéressant de savoir quand le plongeur entre en contact avec le piston mobile, car l'administration d'un médicament n'intervient qu'une fois ce contact établi. La vis-mère du dispositif d'administration de médicament selon l'invention comporte une partie tige et une partie tête, laquelle est composée d'un élément fixe, d'un élément mobile relativement à l'élément fixe, d'un élément de sollicitation servant normalement à éloigner l'élément mobile de l'élément fixe, et d'un capteur pour détecter quand l'élément mobile se rapproche de l'élément fixe. Un des éléments fixes et l'élément mobile comportent une pluralité de doigts souples s'étendant dans l'axe de la vis-mère, et l'autre élément fixe ainsi que l'élément mobile comprennent une pluralité d'ouvertures, chaque doigt souple s'étendant à l'intérieur d'une ouverture correspondante.

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