US 5,549,380 AGranted

Mixing device for manufacturing bone cement

AssigneeMit

InventorsLars .ANG. A. Lidgren, Hans J. Bauer

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Abstract

A mixing device for mixing at least two substances, preferably a liquid monomer and a pulverulent polymer, for manufacturing bone cement. The two substances (16, 17) are mixed in a mixing space (9) in a mixing container (1), preferably in partial vacuum. The substances are provided separated from each other in a container (1, 18, respectively) for each substance. A mixing device (6) is provided in the mixing space (9) for mixing the two substances (16,17) therein. An opener (26), defined preferably by the mixing device (6), is provided for establishing at least one connection (27) between the separately provided substances (16, 17) and for bringing the substances in contact with each other for mixing. During opening of the connection (27) between the substances (16, 17) in the mixing space (9), the vacuum sucks one of the substances (16), preferably the liquid monomer, through the connection (27) to the other substance (17), preferably the pulverulent polymer.

Claims9

Dependent claims

A mixing device for mixing a first substance and a second substance for manufacturing bone cement comprising:

a mixing container defining a mixing space, said first substance being contained in said mixing space, said mixing container comprising a piston movable in said mixing space to displace substance from said mixing space;
means for creating a vacuum in said mixing space;
a second container, said second substance being contained in said second container, said piston being a wall of said second container, said piston separating said second substance in said second container from said first substance in said mixing space;
a movable mixing means in said mixing space comprising an opener thereon;
means for moving said mixing means to (i) provide an opening in said piston, said opening allowing the vacuum in said mixing space to suck said second substance into said mixing space, and (ii) mix said first and second substances in said mixing space;
and
means for moving said piston to displace said mixed first and second substance from said mixing space.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/397,987Filed 3 Mar 1995
Priority: DE 44 09 610.021 Mar 1994
Granted: 27 Aug 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

B65D 81/3255
For packaging two or more different materials which must be maintained separate prior to use in admixture: containers provided with a piston or a…
A61B 17/8825
For introducing fluid filler into bone or extracting it: characterised by syringe details
A61B 17/8827
For introducing fluid filler into bone or extracting it: with filtering, degassing, venting or pressure relief means
B01F 31/441
With stirrers performing an oscillatory, vibratory or shaking movement: performing a rectilinear reciprocating movement