Surgery – Truss – Perineal
Patent
1979-12-20
1982-07-13
Pellegrino, Stephen C.
Surgery
Truss
Perineal
128245, 128261, A61F 504, A61M 300, A61M 3500
Patent
active
043389252
ABSTRACT:
A penetrating bone cement, for example a cement having a viscosity at 68.degree. to 70.degree. 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 cartridge 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 forward engaging member cooperating with a lever pivoted to the housing. Manual rotation of the lever engages the forward engaging member and forces the rod forward to force the plunger into the cartridge. A single manual actuation of the lever results in the extrusion of approximately two cubic cm of bone cement from the cartridge and through the nozzle. In the preferred 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 contains the cement in the front-loading cartridge and which is configured to receive a plurality of different shaped tips.
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A. J. C. Lee et al. "A device to improve the extrusion of bone cement into the bone of the acetabulum in the replacement of the hip joint", Biomed. Eng. 9 (11): 522-4 (Nov. 1974).
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"Improve the strength of the cement and of the cement/bone interface with the _instruments comprising the Exeter Cement Security System", Howmedica International, Inc. 1977.
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Pellegrino Stephen C.
Shedd C. W.
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