Bone cement device and package
OwnerWilliam M. Murrayinventor
Life of this patent
Estimating the term…
Abstract
A device for stirring bone cement includes a bone cement cartridge having a piston at one end of the cartridge and an elongate stirrer extending through the piston and along the cartridge. Bone cement powder and liquid are mixed in the cartridge by relative rotation between the cartridge and stirrer. The mixed bone cement is extruded from the cartridge by moving the piston along the cartridge and the stirrer.
Claims34
A device for stirring and then extruding liquid bone cement, the device comprising:
- a) a cylindrical body having opposed ends and a hollow interior between the ends;
- b) a cylindrical piston positioned in one end of the body to close the end of the body while permitting relative rotation between the piston and the body and movement of the piston along the body, the piston including an off-center stirrer arm opening;
- and
- c) a stirrer in the body, the stirrer including an elongate arm having a first portion in the opening in the piston and a second portion extending away from the piston and along the interior of the body, wherein relative rotation of i) the body and ii) the piston and the stirrer stirs bone cement powder and bone cement liquid in the body to form liquid bone cement, and movement of the piston along the interior of the body extrudes liquid bone cement from the other end of the body and moves the piston along the length of the stirrer arm.
A package for stirring and extruding bone cement, the package comprising a hollow cylindrical body having opposed ends, a cylindrical piston fitted in one end of the body for rotation relative to the body and movement along the interior of the body, a first stirrer opening extending through the piston inwardly from the body, said first stirrer opening having a non-circular transverse cross section, a stirrer including a elongate stirring arm having a uniform transverse cross section conforming to the shape of the stirrer opening in the piston, said stirrer arm extending into the stirrer opening and away from the piston along the interior of the body;
- a body of dry bone cement powder substantially filling the interior of the body, said stirring arm extending along the body of bone cement powder;
- and a removable first seal closing the end of the body away from the piston, wherein relative rotation of the body and stirrer piston stirs the bone cement powder with bone cement liquid placed in the body and movement of the piston along the body and the stirrer extrudes stirred bone cement from the other end of the body.
A device for stirring and then extruding liquid bone cement, the device comprising:
- a) a cylindrical body having opposed ends and a hollow interior between the ends;
- b) a cylindrical piston positioned in one end of the body to close the end of the body while permitting relative rotation between the piston and the body and movement of the piston along the body, the piston including a stirrer arm opening having a non-circular transverse cross section;
- and
- c) a stirrer in the body, the stirrer including an elongate arm having a first portion in the opening in the piston and a second portion extending away from the piston and along the interior of the body, the stirrer arm having an uniform, non-circular cross section conforming to the cross section of the stirrer arm opening so that engagement between the first portion of the stirrer arm and the piston prevents relative rotation of the stirrer arm and piston, wherein relative rotation of i) the body and ii) the piston and the stirrer stirs bone cement powder and bone cement liquid in the body to form liquid bone cement, and movement of the piston along the interior of the body extrudes liquid bone cement from the other end of the body and moves the piston along the length of the stirrer arm.
Dependencies are inferred from the claim text.