Piezoelectric ceramic implants: A feasibility study

Autor: G. H. Kenner, A. F. von Recum, M. F. Grether, B. J. Kelly, W. W. Coffeen, Joon B. Park
Rok vydání: 1980
Předmět:
Zdroj: Journal of Biomedical Materials Research. 14:269-277
ISSN: 1097-4636
0021-9304
DOI: 10.1002/jbm.820140308
Popis: A piezoelectric ceramic has been investigated as a direct substitute for hard tissues. Barium titanate (BaTiOz) power was slipcast and fired at 1430 degrees C for 2 hr, then made piezoelectric by polarizing. After 16 and 86 days of implantation in the cortex of the femoral midshafts, the femora with test specimens were sectioned into about 4-cm lengths. Their voltage outputs were measured under cyclic load at 1 Hz. The present results show that the voltage gradient at the implant surface is 0.15 mV/mm for the 16-day implantation with a 445-N (100-lbs.) load. This in turn can give rise to about 0.01 microA current flow in the adjacent area of the 16-day implant. The 86-day implant showed an order of magnitude higher voltage output compared to the 16-day implant with the same magnitude of loads. This is probably due to the "load-transfer" efficiency through the implants, since the voltage output is directly proportional to the actual load transferred to the implant. The more bone implant interface matures, the better the load transfer occurs through the implant, resulting in higher voltage output.
Databáze: OpenAIRE