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Czech RepublicCzech Technical University in PragueFaculty of Biomedical Engineering
Ilya V. Ivlev
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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
hazardous to both - patients and medical personnel
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↓ ↓↑↑
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Create a mathematical model that contains the main components:
1.the cost of procurement of medical equipment and annual costs of repair;
2.the annual operating costs (mainly including the costs of consumables and power consumption, etc.)
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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, 20076
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device down time (tdow)
time of operation (top)
efficiency coefficient
(Ceff)
1 253 0,99
… … …
15 239 0,87
… … …
30 224 0,73
… … …
72 182 0,21
Working days per year = 254 (working year)
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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 - Ceff after making 300% of the resource. 8
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Third rule:Practical value of Ceff over than value
determined by the first rule is criterion of final medical device impracticability -
THE MEDICAL DEVICE SHOULD BE REPLACED.
Time of use, years
Ceff
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The expectancy economic life of medical equipment:
Chen Kang, Chinese J. of Medical Instrumentation, 2009
P0 - initial price of medical equipment;W - increase in operating costs each year.
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CT scanner: General Electric (HiSpeed CT/e Plus):
• initial price (P0) ≈ $190K;• increase in operating costs each year (W) ≈ $15K
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1. there are different approaches to determining the optimal duration of life (physical, economic) of medical equipment;
2. application of mathematical models helps more carefully and dispassionately manage of equipment;
3. no models that take into account most of the influencing factors and the specifics of medical equipment;
4. do not resolved the question of what is amortization.
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DĚKUJI ZA POZORNOST