Injection apparatus

A - Human Necessities – 61 – F

Patent

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Details

A61F 9/007 (2006.01) A61M 5/46 (2006.01) A61M 5/32 (2006.01) A61M 5/34 (2006.01)

Patent

CA 2339243

The present invention relates to an apparatus and method for using the apparatus for injecting an agent into a tissue, particularly into thin tissues such as the sclera of the eye. The invention provides an apparatus and method for effectively imbedding a needle into a tissue at a predetermined penetration approach angle and penetration distance thereby reducing the risk of penetrating the full thickness of the tissue. The invention includes a support element and a needle guide platform disposed on the support element with an external support surface and a channel extending therethrough and terminating in an aperture at the support surface. A needle disposed in the channel is axially movable along an axis of injection through the channel. The needle is movable from a first retracted position to an extended position corresponding to the penetration distance, along the axis of injection. In one aspect, the needle includes a sidewall defining an outlet in the needle such that when an agent is inserted into the tissue through the outlet it is in an orientation towards one of a first and second surface of the tissue. The axis of injection preferably forms a penetration approach angle of up to about 60° with a tangent of the support surface at a point of intersection of the axis of injection with the projection of the support surface across the aperture.

L'invention porte sur un appareil et son procédé d'utilisation servant à injecter un agent dans un tissu et en particulier dans un tissu mince tel que le scléra de l'oeil. L'appareil et le procédé permettent d'introduire une aiguille dans un tissu sous un angle de pénétration et une à profondeur de pénétration donnés, ce qui réduit le risque de traverser entièrement le tissu. L'invention comporte un support et une plate-forme de guidage de l'aiguille placée sur le support avec une surface extérieure du support et un canal traversant se terminant par une ouverture percée dans ladite surface. Une aiguille placée dans le canal s'y déplace axialement le long de l'axe d'injection entre une première position reculée et une deuxième position avancée correspondant à la distance de pénétration. Dans l'une des exécutions l'aiguille comporte une paroi latérale délimitant l'orifice de sortie de l'aiguille; ainsi lors de l'injection d'un agent dans le tissu via ledit orifice, il s'oriente vers l'une ou l'autre surface du tissu. L'axe d'injection fait de préférence un angle de pénétration allant jusqu'à 60 DEG avec la tangente à la surface support au niveau du point d'intersection de l'axe d'injection avec la projection de la surface support à travers l'ouverture.

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