Mitab Inc.

Corpipharm Gmbh & Co

Sport Exclusive E.h. Ab

Lars A Lidgren

Lars G Dahl

Hans J Bauer

In a method for producing a cement for medical use, a liquid component containing a polymerizable substance is combined with a solid component comprising a plastic substance to provide a setting mass to form the cement. In order to e.g. improve the biological and mechanical properties of the cement and allow it to be mixed by modern mixing procedures, which further improves the cement quality, said plastic substance is mixed with a particulate crystalline ceramic material prior to combining said liquid and solid components. A cement for medical use is also defined as is the use of set cement as an anchorage for the fixation of prostheses or parts of prostheses or bone and as a substitute material for bone.

Cement for medical use, method for producing the cement, and use of the

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.

Mixing device for manufacturing bone cement

A mixing device for producing reduced porosity bone cement. The device having a movable member (6), preferably a movable piston, which is adapted to press out or discharge bone cement (2) from the mixing device (1). The piston is fixedly mounted in the mixing device. The piston maintains its position when bone cement (2) is mixed in a mixing space in the mixing device. The mixing device is under a vacuum during mixing. After mixing, the piston is released such that it can be drawn into the mixing device (1) toward a discharge opening (13) by a vacuum prevailing in the mixing device (1). The moving piston is used for collecting clumps of bone cement (2) in the mixing device (1) adjacent to the discharge opening (13). By collecting the clumps of bone cement by the moving piston (6) under a vacuum, the porosity of the bone cement (2) is reduced.

Device for producing reduced porosity bone cement

A method for producing bone cement by mixing components forming part thereof, whereby mixing occurs in vacuum in a mixing device (1) and whereby ready-mixed bone cement (2) is collected in the mixing device (1) before it is ejected or discharged therefrom. For reducing the volume of porosity of the pores formed in the bone cement (2) during collection, the bone cement (2) is collected in vacuum to provide vacuum in those pores in the bone cement (2) which are formed during collection, whereby the volume of porosity in the bone cement (2) is reduced when the bone cement is subjected to atmospheric pressure after collection. A device for carrying out this method comprises a movable member (6), preferably a movable piston, which is adapted for pressing out or discharging bone cement (2) from the mixing device (1), which is fixedly mounted for maintaining its position when bone cement (2) is mixed in vacuum and which is releasable such that it can be sucked into the mixing device (1) towards a discharge opening (13 ) when vacuum prevails in said mixing device (1) for collecting or gathering bone cement (2) in said mixing device (1) closest to the discharge opening (13).

Method for producing reduced porosity bone cement

Head guard and method for making same

The present invention relates to a method for producing bone cement for fixing protheses, whereby the bone cement is manufactured by mixing various substances with each other to provide a setting mass which in set condition is adapted to fix prostheses at surrounding bone tissue. In order to prevent large amounts of air from being stirring into the mixture, mixing of said various substances occurs under vacuum. The invention also relates to a device for carrying out the method for producing bone cement for fixing prostheses, whereby the bone cement is manufactured by mixing various substances with each other to provide a setting mass which in set condition is adapted to fix protheses at surrounding bone tissue, and whereby the mixture is applied to the bone tissue by means of a feed device (20) from which the mixture (19) may be pressed out. In order to avoid transfer of the mixture from a special mixing container to the feed device, the present device comprises an agitator (8) which is connectable to the feed device (20) and a vacuum source (17) which is connectable to the feed device for mixing said substances in said feed device under vacuum.

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Lund, Sweden

Lars A Lidgren