Special problems related to medical devices.
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Equipment and Supplies↗
Biomedical subjects
F J Meyer
Publications and source records attributed to F J Meyer.
Timed-release depot for anticancer agents.
The timed-release of anticancer agents from composities with poly (lactic acid) was studied in rats. In the case of cyclophosphamide-poly (lactic acid) composites, 67% of the administered dose was released within 34 days. With cis-dichlorodiammineplatinum (II), the amount of drug released was only 9.3% within the same period. This difference might be attributed to the different solubilities of these two drugs in the polymer. Electron spectroscopy chemical analysis, a new tool, was used to investigate the extent of diffusion of drugs in polymer films.
Animals↗
Long acting delivery systems for narcotic antagonists II: release rates of naltrexone from poly(lactic acid) composites.
Parallel in vitro and in vivo release rates of tritiated naltrexone from poly(lactic acid) composites were studied. The in vitro release of naltrexone was 67% of the dose over a 35-day test period, while the in vivo release was only 24% within 70 days. Apparently, an exchange of the tritium for the hydrogen of the body water takes place, indicating that urinary excretion radioactivity is not a reliable measure for estimating the naltrexone released. Naltrexone-poly(lactic acid) composites showed effective blocking action to morphine in rats (24 days), dogs (29 days), monkeys (20 days), and mice (21 days).
Animals↗