Pressure injection of bone cement apparatus and method

Details Pressure injection of bone cement apparatus and method Pressure injection of bone cement apparatus and method

A - Human Necessities

61

F

3/100, 128/41

A61F 2/46 (2006.01) B05C 17/005 (2006.01)

Patent

CA 1162807

PRESSURE INJECTION OF BONE CEMENT APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE A penetrating bone cement, for example a cement having a viscosity at 68° to 70° F of less than 5000 poise and, preferably, less than 2000 poise up to the fifth or sixth minute after the cement is mixed, is injected under high pressure such that the bone cement penetrates the trabeculae of the bone to provide an improved fixation interface between the bone cement and bone. The bone cement is placed within a reinforced, front loading car- tridge having a plunger at one end thereof and a nozzle at the other end thereof. The end of the cartridge having the plunger engages a high pressure injection gun including a housing axially supporting a rod with respect to the cartridge. Carried on the rod is a for- ward engaging member cooperating with a lever pivoted to the . housing. Manual rotation of the lever engages the forward en- gaging member and forces the rod forward to force the plunger into the cartridge. A single manual actuation of the lever re- sults in the extrusion of approximately two cubic cm of bone cement from the cartridge and through the nozzle. In the pre- ferred embodiment, one end of the cartridge is flanged and engages the housing by means of a bezel. The lever is in the form of a trigger pivotally connected to the handle and having a notch engaging the forward engaging member. A rearward engaging member is also provided to prevent rearward movement of the rod and a release pin releasably engages the rearward engaging member. The front of the cartridge includes a front closure cap which con- tains the cement in the front-loading cartridge and which is con- figured to receive a plurality of different shaped tips.

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