High pressure pumping cartridges for medical and surgical...

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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F04B 53/14 (2006.01) A61B 17/32 (2006.01) F04B 53/12 (2006.01)

Patent

CA 2484061

Pumping cartridges includes a series of pumping cartridges compr ising cylinders and pistons constructed and arranged for sliding or reciprocating motion within the cylinders. The pistons and/or cylinders can comprise a sealing component including a circumferential, flared sealing flange and can be configured to enable the pumping cartridge to generate high liquid pumping pressures, for example above 1,000 psig. Some pumping cartridges disclosed include pistons including or at least partially forming a valve and/or pistons that are relatively movable with respect to a piston rod to which they are connected. In some of the disclosed valves, the movable sealing element is concave in shape, and can be curved, to create a mechanical advantage for improved sealing performance. Methods for manufacturing axially-configured pumping cartridges from thin-walled tubing are also disclosed.

L'invention concerne des cartouches de pompage dont une série de cartouches de pompage comprenant des cylindres et des pistons construits et arrangés pour coulisser ou effectuer un mouvement alternatif à l'intérieur des cylindres. Les pistons et/ou cylindres peuvent comprendre un élément d'étanchéité présentant une bride d'étanchéité circonférencielle évasée, et sont configurables pour permettre à la cartouche de pompage de générer des pressions de pompage élevées, supérieure par exemple à 1.000 psi. Certaines car touches de pompage de l'invention comprennent des pistons présentant ou au moins formant partiellement une soupape, et/ou des pistons relativement mobiles par rapport à une tige de piston à laquelle ils sont fixés. Sur quelques-unes des soupapes de l'invention, l'élément d'éthanchéité mobile présente une forme concave et peut être fléchi pour créer un avantage mécanique et améliorer le rendement d'obturation. L'invention concerne en outre des procédés de fabrication de cartouches de pompage à configuration axiale à partir de tubes à paroi mince.

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