Agitating – In vacuum chamber
Reexamination Certificate
2005-03-29
2005-03-29
Sorkin, David (Department: 1723)
Agitating
In vacuum chamber
C366S256000, C366S332000, C222S246000
Reexamination Certificate
active
06871996
ABSTRACT:
The present invention relates to a device at mixing devices for mixing pulverulent and liquid substances with each other for the manufacture of medical products, wherein a displaceable piston means (17) has at least one groove (22) extending around said piston means (17) and at least one sealing ring (23) is located in said groove (22). At least one connecting passage (22e) is provided for preventing a liquid substance (21) from generating or building up such a pressure in an inner space (22d) in the groove (22) within or behind the sealing ring (23) that said pressure presses the sealing ring (23) in a direction outwards (F) relative to the groove (22) towards a surrounding wall (1a) of the mixing device (1) and prevents or counteracts flow of the liquid substance (21) past the piston means (17) when said piston means (17) is displaced.
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Biomet Merck Cementing Technologies AB
Sorkin David
Tarolli, Sundheim Covell & Tummino L.L.P.
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