Bone cement applicator with retractable mixing rod and method for production of a bone cement
AssigneeHeraeus Medical GmbH
InventorsSebastian Vogt, Thomas Kluge
Life of this patent
Estimating the term…
Abstract
A bone cement applicator comprising a cartridge with an internal space. The cartridge has a head with a dispensing opening for expulsion of bone cement, a dispensing plunger, a receptacle mobile in the cartridge, and a mixing rod with a mixer fastened to it and arranged in the internal space of the cartridge. The mixing rod is detachably connected, on a side opposite from the mixer, to a front side of the receptacle that faces the cartridge head. When the mixing rod is detached from the receptacle and the receptacle is propelled in the direction of the cartridge head the mixing rod can be pushed into the receptacle. A method is also disclosed for production of a bone cement using the bone cement applicator.
Claims20
A bone cement applicator for storage and mixing of a bone cement powder and a monomer liquid as well as for applying a pasty bone cement mixed together from the bone cement powder and the monomer liquid, the bone cement applicator comprising:
- a cartridge defining a cylindrical internal space with a cylinder axis in which the bone cement is mixed, the cartridge having a front side, a cartridge head located on the front side with a dispensing opening for expulsion of the bone cement from the internal space, and a rear side situated opposite from the front side;
- a dispensing plunger for expelling the mixed bone cement from the internal space through the dispensing opening, the dispensing plunger arranged in the internal space of the cartridge so as to be mobile along the cylinder axis of the internal space in the direction of the cartridge head, whereby the bone cement powder is contained between the dispensing plunger and the cartridge head in the internal space of the cartridge;
- a receptacle defining an inside, having a front side that faces the cartridge head, and being both plugged into the cartridge on the rear side of the cartridge and mobile in the cartridge;
- a monomer liquid container arranged on the inside of the receptacle and configured to be opened on the inside of the receptacle, the monomer liquid container containing the monomer liquid;
- and
- a mixing rod detachably connected to the receptacle, having a first side that faces the cartridge head and to which a mixer is fastened and a second side opposite from the first side and to which the front side of the receptacle is connected, and being arranged in the internal space of the cartridge, such that the mixing rod and the mixer can be moved in the internal space of the cartridge for mixing the bone cement powder with the monomer liquid through a motion of the receptacle against the cartridge, wherein, when the mixing rod is detached from the receptacle and the receptacle is propelled in the direction of the cartridge head the mixing rod can be pushed into the receptacle,
- wherein the front side of the receptacle forms the dispensing plunger and the dispensing plunger is cylindrical.
A bone cement applicator for storage and mixing of a bone cement powder and a monomer liquid as well as for applying a pasty bone cement mixed together from the bone cement powder and the monomer liquid, the bone cement applicator comprising:
- a cartridge defining a cylindrical internal space with a cylinder axis in which the bone cement is mixed, the cartridge having a front side, a cartridge head located on the front side with a dispensing opening for expulsion of the bone cement from the internal space, and a rear side situated opposite from the front side;
- a dispensing plunger for expelling the mixed bone cement from the internal space through the dispensing opening, the dispensing plunger arranged in the internal space of the cartridge so as to be mobile along the cylinder axis of the internal space in the direction of the cartridge head, whereby the bone cement powder is contained between the dispensing plunger and the cartridge head in the internal space of the cartridge;
- a receptacle defining an inside, having a front side that faces the cartridge head, and being both plugged into the cartridge on the rear side of the cartridge and mobile in the cartridge;
- a monomer liquid container arranged on the inside of the receptacle and configured to be opened on the inside of the receptacle, the monomer liquid container containing the monomer liquid;
- and
- a mixing rod detachably connected to the receptacle, having a first side that faces the cartridge head and to which a mixer is fastened and a second side opposite from the first side and to which the front side of the receptacle is connected, and being arranged in the internal space of the cartridge, such that the mixing rod and the mixer can be moved in the internal space of the cartridge for mixing the bone cement powder with the monomer liquid through a motion of the receptacle against the cartridge, wherein, when the mixing rod is detached from the receptacle and the receptacle is propelled in the direction of the cartridge head the mixing rod can be pushed into the receptacle,
- wherein the dispensing plunger has at least one channel that is impermeable to the bone cement powder and is permeable to the monomer liquid and gases.
A bone cement applicator for storage and mixing of a bone cement powder and a monomer liquid as well as for applying a pasty bone cement mixed together from the bone cement powder and the monomer liquid, the bone cement applicator comprising:
- a cartridge defining a cylindrical internal space with a cylinder axis in which the bone cement is mixed, the cartridge having a front side, a cartridge head located on the front side with a dispensing opening for expulsion of the bone cement from the internal space, and a rear side situated opposite from the front side;
- a dispensing plunger for expelling the mixed bone cement from the internal space through the dispensing opening, the dispensing plunger arranged in the internal space of the cartridge so as to be mobile along the cylinder axis of the internal space in the direction of the cartridge head, whereby the bone cement powder is contained between the dispensing plunger and the cartridge head in the internal space of the cartridge;
- a receptacle defining an inside, having a front side that faces the cartridge head, and being both plugged into the cartridge on the rear side of the cartridge and mobile in the cartridge;
- a monomer liquid container arranged on the inside of the receptacle and configured to be opened on the inside of the receptacle, the monomer liquid container containing the monomer liquid;
- and
- a mixing rod detachably connected to the receptacle, having a first side that faces the cartridge head and to which a mixer is fastened and a second side opposite from the first side and to which the front side of the receptacle is connected, and being arranged in the internal space of the cartridge, such that the mixing rod and the mixer can be moved in the internal space of the cartridge for mixing the bone cement powder with the monomer liquid through a motion of the receptacle against the cartridge, wherein, when the mixing rod is detached from the receptacle and the receptacle is propelled in the direction of the cartridge head the mixing rod can be pushed into the receptacle,
- wherein the inside of the receptacle is connected in a liquid-permeable manner to the internal space of the cartridge, the front side of the receptacle has at least one liquid-permeable passage, and the dispensing plunger has at least one liquid-permeable channel.
Dependencies are inferred from the claim text.