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Optimal replacement policy in the medical equipment management. Czech Republic Czech Technical University in Prague Faculty of Biomedical Engineering . Ilya V. Ivlev. Introduction. Decisive factor: the state of equipment used in hospitals Problematic issues:
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Optimal replacement policy in the medical equipment management Czech Republic Czech Technical University in Prague Faculty of Biomedical Engineering Ilya V. Ivlev
Introduction Decisive factor: • the state of equipment used in hospitals Problematic issues: • the standard service life of the majority of medical equipment has already expired Caution: • use of this equipment can become hazardousto both - patients and medical personnel
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How to manage medical equipment? Create a mathematical model that contains the main components: • the cost of procurement of medical equipment and annual costs of repair; • the annual operating costs (mainly including the costs of consumables and power consumption, etc.)
The first approach:optimal physical life Possible solution requires certain rules: First rule: medical device down time (tdow) for repair and maintenance should not exceed half time of operation (top); Efficiency coefficient is: A. M. Aronov, Biomedical Engineering, 2007
Changes in the ratio of the factors tdow and top Working days per year = 254 (working year)
The first approach:optimal physical life Second rule: efficiency coefficient Ceff during medical device normal service life varies: Fig. Ceff variation during medical device service life. Ceff Time of use, years I - varies of Ceff during normal service life of medical device; II - varies of Ceff after double normal service life (if the medical device is still used); III - Ceffafter making 300% of the resource.
The first approach:optimal physical life Third rule: • Practical value of Ceffover than value determined by the first rule is criterion of final medical device impracticability - The medical device should be replaced. Ceff Time of use, years
The second approach:optimal economic life The expectancy economic life of medical equipment: P0 - initial price of medical equipment; W - increase in operating costs each year. Chen Kang, Chinese J. of Medical Instrumentation, 2009
The second approach:optimal economic life CT scanner: General Electric (HiSpeed CT/e Plus): • initial price (P0) ≈ $190K; • increase in operating costs each year (W) ≈ $15K
Conclusion • there are different approaches to determining the optimal duration of life (physical, economic) of medical equipment; • application of mathematical models helps more carefully and dispassionately manage of equipment; • no models that take into account most of the influencing factors and the specifics of medical equipment; • do not resolved the question of what is amortization.
