Device and method for mixing bone cement
Device and method for mixing bone cement, for injection into vertebra in particular, comprising a mixing beaker ( 1 ), manual stirring rod ( 6 ) and a cover ( 2 ), which fits in said mixing beaker ( 1 ) with a perfect fit, and the lowermost point of which features an extraction hollow cone ( 3 ) in which an extraction syringe for extraction by suction of bone cement mixed in said mixing beaker ( 1 ) is provided.
1. A device for mixing bone cement comprising:
a mixing beaker ( 1 ) that is open at an upper end; and
a cover ( 2 ) to close the upper end;
wherein the mixing beaker ( 1 ) has a concave beaker bottom ( 12 ) and raised side walls ( 11 ) with a corner-less cross section, without being circular;
wherein the cover ( 2 ) features a shape with a cover bottom ( 22 ) that fits in the beaker bottom ( 12 ) with a perfect fit; and
wherein provided at the lowermost point of the cover ( 2 ) is an extraction hollow cone ( 3 ), the interior of which pierces the cover bottom wall ( 22 ) and is designed for anchorage of an extraction syringe during removal by suction of the mixed bone cement.
2. The device according to claim 1 , wherein the cross section of the raised side wall ( 11 ) of the mixing beaker ( 1 ) forms an approximate ellipse.
3. The device according to claim 1 , wherein the beaker bottom ( 12 ) features a symmetrical axis ( 13 ), and the concavity of the beaker bottom ( 12 ) appears to be circular in axial cross section.
4. The device according to claim 1 , wherein the raised side wall ( 11 ) of the mixing beaker ( 1 ) features a symmetrical axis ( 13 ) and runs parallel to the axis.
5. The device according to claim 1 , wherein the angle of the opening of the extraction hollow cone ( 3 ) features a 6% incline of the side wall of said cone.
6. The device according to claim 1 , wherein, provided on the raised side wall ( 11 ) of the mixing beaker ( 1 ) is a flange ( 4 ) in order to affix a cover film ( 5 ).
7. The device according to claim 2 , wherein the interior space of the mixing beaker ( 1 ) features a width in the range of 44 to 49 mm±50% and a height in the range of 42 mm±50%.
8. Method for mixing bone cement with a device according to claim 1 , comprising:
a) mixing bone cement in a mixing beaker ( 1 ) by means of a manual stirring rod ( 6 );
b) inserting the cover ( 2 ) and displacing air above the mixed bone cement in the mixing beaker ( 1 ), with the center of the cover ( 2 ) featuring an extraction hollow cone ( 3 ), by which means bone cement mixed in the mixing beaker ( 1 ) can be extracted;
c) introducing a port of an extraction syringe in the extraction hollow cone ( 3 );
d) extracting by suction the mixed bone cement by means of the extraction syringe from the mixing beaker ( 1 ) without a twisting of same, with the cover ( 2 ) lowering according to the extracted quantity of mixed bone cement; and
e) detaching the extraction syringe from the extraction hollow cone ( 3 ).
9. Method according to claim 8 , characterized in that polymethylmethacrylate is used as the mixed bone cement.
10. Method according to claim 8 , characterized in that calcium phosphates or calcium sulphates are used as the mixed bone cement.
11. Method according to claim 8 , characterized in that the mixed bone cement is employed for vertebroplasty.
12. Method according to claim 8 , characterized in that the mixed bone cement is employed for kyphoplasty.
13. Method according to claim 8 further comprising providing a flange ( 4 ) on the raised side wall ( 11 ) of the mixing beaker ( 1 ), characterized in that the bone cement is mixed from two components, and one of said two components is provided in the mixing beaker ( 1 ), which is closed by means of a cover film ( 5 ) affixed to the flange ( 4 ).