Cylinder/piston unit with at least three sealing elements

Details Cylinder/piston unit with at least three sealing elements Cylinder/piston unit with at least three sealing elements

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2631835

The application relates to a cylinder/piston unit with a cylinder (10) and with a piston (50) which is guided therein and which is sealed off in a sterile manner by a rubber seal, wherein the cylinder (10) and the piston (50) enclose a chamber (30) that can be filled at least temporarily with active substance, and the cylinder has at least one discharge element (36) at its front end. When the piston (50) is actuated, two individual static sealing elements (65, 85) are transferred from their respective sealing position (67, 87) into a parked position (69, 89) located in the parking area (68, 88), wherein each sealing element (65, 85) in the parked position (69, 89) touches only the cylinder wall (47, 48) or only the piston wall (64, 84).

L'invention concerne un ensemble cylindre-piston, avec un cylindre (10) et avec un piston (50) guidé dans le cylindre en étant rendu étanche de manière aseptique par du caoutchouc. Le cylindre (10) et le piston (50) délimitent une chambre (30) pouvant être au moins temporairement remplie de substance active. Le cylindre présente au moins un élément de sortie (36) à son extrémité avant. Lorsque le piston (50) est actionné, deux éléments d'étanchéité statiques individuels (65, 85) sont transférés de leur position d'étanchement respective (67, 87) dans une position de rangement (69, 89) située dans un espace de rangement (68, 88). Dans la position de rangement (69, 89), chaque élément d'étanchéité (65, 85) entre en contact avec seulement la paroi (47, 48) du cylindre ou seulement la paroi (64, 84) du piston.

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