Collapsible syringe cartridge

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/24 (2006.01) A61M 5/28 (2006.01) A61M 5/315 (2006.01) A61M 5/32 (2006.01) A61M 5/46 (2006.01)

Patent

CA 2465901

The present invention provides a syringe cartridge that is sufficiently robust to be used in autoinjectors that generate injection forces sufficient to deliver viscous medicaments. The syringe cartridge (100) of the present invention includes a syringe (200), a bias mechanism (300), and a casing. The casing of the syringe cartridge of the present invention includes a collapsible portion (430) and a fixed portion (460). Advantageously, the collapsible portion (430) of the casing collapses within the fixed portion (460) of the casing as the syringe (200) is driven through its stroke within the syringe cartridge. As the collapsible portion collapses within the fixed portion, the length of the syringe cartridge (100) is effectively reduced, which, in turn, allows the use of a shorter plunger and thereby facilitates the construction of a more compact autoinjector.

La présente invention porte sur une cartouche de seringue suffisamment solide pour être utilisée dans des auto-injecteurs qui génèrent des forces d'injection suffisantes pour administrer des médicaments visqueux. La cartouche de seringue de la présente invention comprend une seringue, un mécanisme de sollicitation et une enveloppe. L'enveloppe de la cartouche de seringue comprend une partie compressible et une partie fixe. La partie compressible de l'enveloppe présente l'avantage de se compresser dans la partie fixe de l'enveloppe lorsque la seringue est poussée dans sa course dans la cartouche de seringue. Lorsque la partie compressible se compresse dans la partie fixe, la longueur de la cartouche de seringue est sensiblement réduite, ce qui permet alors d'utiliser un piston plus court et facilite la fabrication d'un auto-injecteur plus compact.

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