Needleless syringe functioning with a double-composition...

A - Human Necessities – 61 – M

Patent

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A61M 5/303 (2006.01) C06B 25/24 (2006.01) C06B 45/12 (2006.01)

Patent

CA 2406560

The technical field of the invention is that of pre-filled and disposable needleless syringes, used for intradermal, subcutaneous and intramuscular injections of liquid active principle for therapeutic use in human and veterinary medicine. The inventive syringes (1) are mainly characterised in that they function with a pyrotechnic charge (6) consisting of a mixture of powder with high burning rate and a powder with low burning rate. Indeed, the combustion of the powder with a high burning rate enables to communicate instantly, through a piston (3), a very high speed to the active principle (4), whereas the combustion of the powder with a low burning rate enables to maintain a threshold pressure level to proceed with the injection, so as to ensure that the active principle (4) penetrates through the skin. Thus, the injection is properly and homogeneously without any loss of active liquid (4).

Le domaine technique de l'invention est celui des seringues sans aiguille pré- remplies et jetables, utilisées pour les injections intradermiques, sous-cutanées et intramuscu-laires, de principe actif liquide à usage thérapeutique en médecine humaine ou vétérinaire. La principale caractéristique des seringues (1) sans aiguille selon l'invention est qu'elles fonc-tionnent avec une charge pyrotechnique (6) constituée par le mélange d'une poudre vive avec une poudre lente. En effet, la combustion de la poudre vive permet de communiquer instantané-ment, grâce à un piston (3), une vitesse très élevée au principe actif (4), tandis que la combustion de la poudre lente permet de maintenir un niveau de pression seuil pour la suite de l'injection, dans le but d'assurer la pénétration dudit principe actif (4) à travers la peau. De cette manière, l'injection s'effectue proprement et de façon homogène, sans aucun déperdition de principe ac-tif liquide (4).

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