Method for bringing a powder and a liquid component in contact with each other for mixing to form bone cement
View Patent ↗The present invention relates to a method for bringing a powder and a liquid component, preferably polymer and monomer, in contact with each other for mixing thereof, preferably to form bone cement, wherein the powder component (P) is placed in a mixing container ( 1 ) in which the mixing shall occur and the liquid component (M) in a liquid container ( 18 ) from which said the liquid component (M) is transferred to the powder component (P) in the mixing container ( 1 ). In this method, a vacuum is generated in the mixing container ( 1 ) and the liquid container ( 18 ) is opened by means of at least one cannula ( 14 ) or similar member through which the liquid component (M) can be brought to flow from the liquid container ( 18 ) to the mixing container ( 1 ). The vacuum is brought to suck the liquid component (M) from the liquid container ( 18 ), through the cannula ( 14 ) and into the mixing container ( 1 ) to the powder component (P) therein, and/or is the liquid component (M) pressed into the mixing container ( 1 ) through the cannula ( 14 ) while the liquid container ( 18 ) is compressed because of the pressure difference between the vacuum in the interior of the liquid container ( 18 ) and the air pressure outside the liquid container. The invention also relates to a device for carrying through the method.
1. Method for bringing a powder and a liquid component, in contact with each other for mixing thereof to form bone cement, wherein:
the powder component (P) is placed in a mixing container ( 1 ) in which the mixing shall occur and the liquid component (M) in at least one liquid container ( 18 ) from which said liquid component (M) is transferred to the powder component (P) in the mixing container ( 1 ),
a vacuum is generated in the mixing container ( 1 ),
the liquid container ( 18 ) is opened by means of at least one cannula ( 14 ) through which the liquid component (M) can be brought to flow from the liquid container ( 18 ) to the mixing container ( 1 ), the cannula being located between a first and a second end portion ( 33 , 34 ) of the mixing container ( 1 ) and protruding from said mixing container ( 1 ) in a radial direction relative to a geometric longitudinal axis (A) of the mixing container ( 1 ),
the vacuum is brought to suck the liquid component (M) from the liquid container ( 18 ), through the cannula ( 14 ) and into the mixing container ( 1 ) to the powder component (P) therein, and/or
the liquid component (M) is pressed into the mixing container ( 1 ) through the cannula ( 14 ) while the liquid container ( 18 ) is compressed because of the pressure difference between the vacuum in the interior of the liquid container ( 18 ) and the air pressure outside said liquid container.
2. Method according to claim 1 , wherein a sealing means ( 25 ) is brought to provide sealing between the cannula ( 14 ) and the liquid container ( 18 ) and about such a wall portion ( 21 ) of the liquid container ( 18 ) which is opened by the cannula.
3. Method according to claim 1 , wherein the liquid container ( 18 ) is opened by the cannula ( 14 ) by pressing said liquid container against said cannula.
4. Method according to claim 3 , wherein the liquid container ( 18 ) is opened by pressing it against the cannula ( 14 ).
5. Method according to claim 1 , wherein the liquid container ( 18 ) is placed in a ready position from which it is pressed in a direction towards the cannula ( 14 ) such that the liquid container ( 18 ) is opened thereby.
6. Method according to claim 5 , wherein the liquid container ( 18 ) is held in the ready position by a bracket ( 23 ) and is pressed from said position towards the cannula ( 14 ) by pressing the bracket ( 23 ) in a direction towards said cannula.
7. Method according to claim 1 , wherein the liquid container ( 18 ) is opened by bringing the cannula ( 14 ) to penetrate such a wall portion ( 21 ) of said liquid container ( 18 ) which closes a lateral hole ( 20 ) in an inner tube member ( 19 ) in the liquid container ( 18 ).
8. Method according to claim 1 , wherein the liquid component (M) is sucked into the powder component (P) in the mixing container ( 1 ) at a side of said container situated between a first and a second end portion ( 33 , 34 ) thereof.
9. Method according to claim 1 , wherein the liquid component (M) is sucked out of two liquid containers ( 18 ) and into the mixing container ( 1 ), whereby one of the liquid containers ( 18 ) is opened by a first cannula ( 14 ) and the other liquid container ( 18 ) by another cannula ( 14 ).
10. Method according to claim 9 , wherein the liquid containers ( 18 ) are opened substantially at the same time by being pressed substantially at the same time against the cannulae ( 14 ).
11. Method according to claim 1 , wherein mixing of the powder and liquid components (P, M) is performed in the mixing container ( 1 ) while there is a vacuum therein.
12. Method according to claim 1 , wherein mixing of the powder and liquid components (P, M) is performed in the mixing container ( 1 ) by means of a mixing means ( 7 ) therein.
13. Method according to claim 1 , wherein:
the mixed mixture is collected in such a part ( 35 ) of the mixing container ( 1 ) from which the mixture shall be discharged, and the collection is carried through by means of a piston ( 13 ) which is released and sucked in a direction towards said part ( 35 ) of the mixing container ( 1 ) by being affected by a vacuum therein.
14. Method according to claim 1 , wherein a vacuum is generated in the mixing container ( 1 ) corresponding to a negative pressure of about −0.87 bar.
15. Method according to claim 1 , wherein the powder component (M) extends within the mixing container ( 1 ) from a first position along the longitudinal axis (A) to a second position along the longitudinal axis (A), the liquid component (M) being sucked into the mixing container ( 1 ) between the first position and the second position.
16. Method for bringing a powder and a liquid component in contact with each other for mixing thereof to form bone cement,
wherein the powder component (P) is placed in a mixing container ( 1 ) in which the mixing shall occur and the liquid component (M) in at least one liquid container ( 18 ) from which the liquid component (M) is transferred to the powder component (P) in the mixing container ( 1 ),
wherein a vacuum is generated in the mixing container ( 1 ),
the liquid container ( 18 ) being opened by at least one cannula ( 14 ) member non-displaceably provided on the mixing container ( 1 ) and projecting from the mixing container in a radial direction relative to a geometric longitudinal axis (A) thereto, by pressing a bracket ( 23 ), by means of which the liquid container ( 18 ) is held in a ready position, laterally from the ready position towards the cannula, that a sealing means ( 25 ) is brought to provide sealing between the cannula ( 14 ) and the liquid container ( 18 ) and about such a wall portion ( 21 ) of the liquid container ( 18 ) which is opened by the cannula,
such that the vacuum in the mixing container ( 1 ) can suck the liquid component (M) from the liquid container ( 18 ), through the cannula ( 14 ) and into the mixing container ( 1 ) and the powder component (P) therein, and/or
such that the liquid component (M) is pressed into the mixing container ( 1 ) through the cannula ( 14 ) while the liquid container ( 18 ) is compressed because of the pressure difference between the vacuum in the interior of the liquid container ( 18 ) and the air pressure outside the liquid container, and
that mixing of the powder and liquid components (P, M) is performed in the mixing container ( 1 ) while there is a vacuum therein.
17. Method according to claim 16 , wherein the liquid container ( 18 ) is opened by pressing it against a cannula ( 14 ) which is located on the mixing container ( 1 ) between a first and a second end portion ( 33 , 34 ) thereof.
18. Method according claim 16 , wherein the liquid container ( 18 ) is opened by bringing the cannula ( 14 ) to penetrate such a wall portion ( 21 ) of the liquid container ( 18 ) which closes a lateral hole ( 20 ) in an inner tube member ( 19 ) in the liquid container ( 18 ).
19. Method according claim 16 , wherein the liquid component (M) is sucked into the powder component (P) in the mixing container ( 1 ) at a side of the container situated between a first and a second end portion ( 33 , 34 ) thereof.
20. Method according claim 16 , wherein the liquid component (M) is sucked out of two liquid containers ( 18 ) and into the mixing container ( 1 ), whereby one of the liquid containers ( 18 ) is opened by a first cannula ( 14 ) and the other liquid container ( 18 ) by another cannula ( 14 ).
21. Method according to claim 20 , wherein the liquid containers ( 18 ) are opened substantially at the same time by being pressed substantially at the same time against the cannula ( 14 ).
22. Method according claim 16 , wherein mixing of the powder and liquid components (P, M) is performed in the mixing container ( 1 ) by means of a mixing means ( 7 ) therein.
23. Method according claim 16 , wherein the mixed mixture is collected in such a part ( 35 ) of the mixing container ( 1 ) from which the mixture shall be discharged, and that this collection is carried through by means of a piston ( 13 ) which is released and sucked in a direction towards the part ( 35 ) of the mixing container ( 1 ) by being affected by a vacuum therein.
24. Method according claim 16 , wherein a vacuum is generated in the mixing container ( 1 ) corresponding to a negative pressure of about −0.87 bar.