Agitating – In vacuum chamber
Patent
1993-11-16
1995-03-07
Scherbel, David A.
Agitating
In vacuum chamber
366142, B01F 1306
Patent
active
053951670
ABSTRACT:
A system for mixing bone cement is disclosed. Dry PMMA powder and MMA liquid are mixed in a vacuum chamber by a rotary mixer having a pair of spaced mixing arms. The rotary mixer is manually rotated by a gear drive. The arms of the rotary mixer follow continuous paths, each path having a plurality of loops at the wall of the chamber and curved portions extending across the chamber between loops. The arms move through the cement, break bubbles and thoroughly mix the PMMA and MMA. Gas from broken bubbles is vacuum drawn from the mixer by a vacuum source through a vacuum tube which extends between the mixer and a vacuum source. The vacuum source is automatically deactivated when the vacuum tube is detached from the mixer.
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Chin Randall E.
Hooker Thomas
Scherbel David A.
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