초록 ▼

A vacuum mixing system for the mixing of polymethylmethacrylate bone cement, comprising at least one cartridge (4) having an evacuable internal space for mixing of the bone cement, a pump (18) for generating a negative pressure, and a connecting conduit (12) connecting the internal space of the at l

A vacuum mixing system for the mixing of polymethylmethacrylate bone cement, comprising at least one cartridge (4) having an evacuable internal space for mixing of the bone cement, a pump (18) for generating a negative pressure, and a connecting conduit (12) connecting the internal space of the at least one cartridge (4) to the pump (18) for generating a negative pressure, an integrated energy reservoir (28) for driving the pump (18) that is or can be connected to the pump (18) and has energy for at least one pumping process of the pump (18) stored in it, whereby a negative pressure can be generated by means of the pump (18) during the pumping process, which negative pressure can be used to evacuate gas from the internal space of the at least one cartridge (4) through the connecting conduit (12).

대표청구항 ▼

1. Vacuum mixing system for the mixing of polymethylmethacrylate bone cement, comprising at least one cartridge (4, 54) having an evacuable internal space for mixing of the bone cement,a pump (18, 68) for generating a negative pressure, anda connecting conduit (12, 62) connecting the internal space

1. Vacuum mixing system for the mixing of polymethylmethacrylate bone cement, comprising at least one cartridge (4, 54) having an evacuable internal space for mixing of the bone cement,a pump (18, 68) for generating a negative pressure, anda connecting conduit (12, 62) connecting the internal space of the at least one cartridge (4, 54) to the pump (18, 68) for generating a negative pressure, wherein the vacuum mixing system comprises an integrated energy reservoir (28, 78) for driving the pump (18, 68) that is or can be connected to the pump (18, 68) and has energy for at least one pumping process of the pump (18, 68) stored in it, whereby a negative pressure can be generated by means of the pump (18, 68) during said at least one pumping process by consuming energy from the integrated energy reservoir (28, 78) such that the negative pressure can be used to evacuate gas from the internal space of the at least one cartridge (4, 54) through the connecting conduit (12, 62), wherein said integrated energy reservoir (28, 78) is a tensioned restoring element (28, 78). 2. Vacuum mixing system according to claim 1, wherein the pump (18, 68) comprises a gas-tight pumping space (26, 76) and a mobile plunger (22, 72) or a mobile wall is provided in the pump (18, 68) to serve as boundary of the pumping space (26, 76), whereby the plunger (22, 72) or wall can be driven in one direction by the energy of the integrated energy reservoir (28, 78) such that the motion of the plunger (22, 72) or wall enlarges the pumping space (26, 76) and the negative pressure thus arising in the pumping space (26, 76) allows the internal space of the at least one cartridge (4, 54) to be evacuated through the connecting conduit (12, 62). 3. Vacuum mixing system according to claim 2, wherein said enlargement of the pumping space (26, 76) is by a volume that is at least equal to the free volume of the internal space of the cartridge (4, 54). 4. Vacuum mixing system according to claim 1, wherein the vacuum mixing system comprises a mixing device for the mixing of the content of the at least one cartridge (4, 54), whereby the mixing device is arranged in the internal space of the cartridge (4, 54) and/or can be driven manually or through a motor. 5. Vacuum mixing system according to claim 1, wherein said vacuum mixing system has a total weight that is less than 30 kg. 6. Vacuum mixing system according to claim 1, wherein the vacuum mixing system comprises a manually-operable operating element (30, 80) that can be operated to release the energy from the energy reservoir (28, 78), whereby the released energy drives the pump (18, 68) and the driven pump (18, 68) evacuates the internal space of the cartridge (4, 54). 7. Vacuum mixing system according to claim 1, wherein a mobile dispensing plunger (9, 10, 59, 60) for dispensing the mixed bone cement from the cartridge (4, 54) is arranged in the internal space of the cartridge (4, 54), whereby the dispensing plunger (9, 10, 59, 60) is or can be locked in place in detachable manner in order to prevent the dispensing plunger (9, 10, 59, 60) from moving in response to the effect of the negative pressure. 8. Vacuum mixing system according to claim 1, wherein an expansion or contraction of the tensioned restoring element (28, 78) generates a negative pressure in the internal space of the cartridge (4, 54). 9. Vacuum mixing system according to claim 1, wherein the cartridge (4, 54) is a cement cartridge (4, 54) filled with cement powder and the vacuum mixing system comprises a container (2) that is separate from the cement cartridge (4, 54) and contains a monomer liquid, whereby the container (2) is connected, in liquid-impermeable manner, to the internal space of the cement cartridge (4, 54) through a separating element (44) that can be opened, and the internal space of the cement cartridge (4, 54) is or can be connected to the pump (18, 68) in gas-permeable manner. 10. Vacuum mixing system according to claim 1, wherein the pump (18, 68) comprises a hollow cylinder (20, 70), whereby the hollow cylinder (20, 70) is or can be connected to the internal space of the cartridge (4, 54); a gas-tight closure on one end of the hollow cylinder; a plunger (22, 72) that is arranged in the hollow cylinder (20, 70) such as to be gas-tight and axially mobile; said tensioned restoring element is a spring (28, 78) that is arranged between the plunger (22, 72) and the closure; a connecting element (30, 80) that is connected, in detachable manner, to the plunger (22, 72) and keeps the plunger (22, 72) in position in the hollow cylinder (20, 70) and keeps the spring (28, 78) tensioned or compressed, whereby the connecting element (30, 80) is guided out of the hollow cylinder (20, 70) through a gas-tight feed-through and can be detached from the plunger (22, 72) from outside, whereby, after detaching the connection of the connecting element (30, 80), the plunger (22, 72) can be moved axially opposite to the closure by the expansion of the spring (28, 78). 11. Vacuum mixing system according to claim 10, wherein said spring (28, 78) is compressed in the storage state and is kept in the compressed state by the plunger (22, 72) of the pump (18, 68) by means of the locked connecting element (30, 80). 12. Vacuum mixing system according to claim 10 wherein the plunger (22, 72) is shifted inside the hollow cylinder (20, 70) after expansion of said spring (28, 78) such that the volume of the pumping space (26, 76) formed by the hollow cylinder (20, 70), the closure, and the plunger (22, 72) is at least equal to the volume of the internal space of the cartridge (4, 54) to be evacuated. 13. Vacuum mixing system according to claim 10, wherein a boundary element is arranged on the end of the hollow cylinder (20, 70) and limits the motion of the plunger (22, 72) such that the plunger cannot exit from the hollow cylinder (20, 70). 14. Vacuum mixing system according to claim 10, wherein the plunger (22, 72) contains, on the side facing away from the closure, an optical marker (34, 87) that can be recognized visually on the outside of the vacuum mixing system after a maximal motion of the plunger (22, 72) took place and thus indicates the position of the plunger (22, 72) after its maximal motion. 15. Method for the mixing of polymethylmethacrylate bone cement in an internal space of a cartridge (4, 54) of a vacuum mixing system according to claim 1, wherein energy stored in the tensioned restoring element (28, 78) that is integrated into the vacuum mixing system is used to drive a pump (18, 68) of the vacuum mixing system, whereby the pump (18, 68) thus driven is used to evacuate the internal space of the cartridge (4, 54) and to mix a bone cement in the internal space of the cartridge (4, 54). 16. Method according to claim 15, wherein the volume of a pumping space (26, 76) of the pump (18, 68) is enlarged by relaxation of the tensioned restoring element (28, 78), and the internal space of the cartridge (4, 54) is evacuated by the negative pressure thus generated. 17. Method according to claim 15, wherein the internal space of the cartridge (4, 54) contains a cement powder, and the pump (18, 68) evacuates a gas from the internal space of the cartridge (4, 54), a monomer liquid is guided into the internal space of the cartridge (4, 54), and the monomer liquid is mixed with the cement powder in the evacuated internal space of the cartridge (4, 54). 18. Method according to claim 15, wherein a connecting element (30, 80) is detached from a plunger (22, 72) of the pump (18, 68); followed by said tensioned restoring element (28, 78) moving the plunger (22, 72) axially in a hollow cylinder (20, 70) of the pump (18, 68), by means of which a negative pressure is generated; whereby gas is aspirated from the internal space of the cartridge (4, 54) through a connecting conduit (12, 62) into the hollow cylinder (20, 70); followed by a cement powder being mixed, manually or motor-driven, with a monomer liquid by means of a mixing device (6, 56); followed by the cartridge (4, 54) with the mixed cement dough being removed; and the cement dough being extruded from the cartridge (4, 54) by moving a dispensing plunger axially (9, 10, 59, 60). 19. Method according to claim 15, wherein the cement powder is arranged in the cartridge (4, 54);the monomer liquid is arranged in a container (2) that is separate from the cartridge (4, 54), whereby the monomer liquid is separated from the cement powder in the cartridge (4, 54) by means of a separating element (44);the separating element (44) is opened before the connecting element (30, 80) is detached from the plunger (22, 72) such that a liquid-permeable connection is established between the internal space of the cartridge (4, 54) and the container (2); followed by the tensioned restoring element (28, 78) moving the plunger (22, 72) axially in the hollow cylinder (20, 70), whereby a negative pressure is generated; whereby gas is aspirated from the internal space of the cartridge (4, 54) through the connecting conduit (12, 62) into the hollow cylinder (20, 70), and monomer liquid is aspirated into the cartridge (4, 54) through the negative pressure formed in the internal space of the cartridge (4, 54).