Bone cement injector gun
AssigneeZimmer, Inc.
InventorsMichael E. Hawkins, Stephen H. Hoag, Kirt L. Case, Kwan-Ho Chan
Life of this patent
Estimating the term…
Abstract
A paste injector gun, especially adapted for injecting bone cement, has first and second mechanical advantages corresponding to different portions of the trigger stroke. The first mechanical advantage is greater than the second such that the first facilitates pressurizing the bone cement and the second facilitates high volume dispensing of the bone cement. The injector gun also includes a pair of U-shaped slots. One of the slots is sized to accept a large cement cartridge and the other slot is sized to accept a small cement cartridge.
Claims17
A paste injector gun comprising:
- a trigger having a range of travel with first and second stages, the first stage being from an initial rest position to an intermediate position and the second stage being from the intermediate position to a subsequent position of further trigger travel;
- first pivot means for providing a first center of rotation for the trigger, the first pivot means being engaged during the first stage of travel, the first pivot means corresponding to a first mechanical advantage;
- and
- second pivot means for providing a second center of rotation for the trigger, the second pivot means being engaged during the second stage of travel, the second pivot means corresponding to a second mechanical advantage, the second mechanical advantage being lower than the first mechanical advantage.
A paste injector gun for dispensing a paste from a cartridge, the paste injector gun comprising a means for gripping the cartridge, the means for gripping the cartridge being able to grip cartridges of at least two different diameters such that the same paste injector gun can be used to dispense paste from both small and large cartridges and means for dispensing the paste from the cartridge.
A paste injector gun comprising:
- shaft means for translation along an axis;
- advancing means for advancing the shaft along the axis, the advancing means including a trigger having a range of rotation from a rest position to a stop position, the range of rotation having first and second stages, the shaft advancing a first predetermined distance for each degree of trigger rotation in the first stage, the shaft advancing a second predetermined distance for each degree of trigger rotation in the second stage, the second predetermined distance being greater than the first predetermined distance.
Dependencies are inferred from the claim text.