Life science special report 161215 IY opt

LIFE SCIENCES HIGH-TECH OPERATING ROOM
LT V - fi e l d
FIGURE 6: Temperature distribution in the area of the
operating table (LTV = low-turbulence velocity)
FIGURE 9: CFD simulation of a hybrid OR with temperaturecontrolled
directional airfl ow
FIGURE 7: Comparison of simulated and measured temperature distributions
FIGURE 8: Comparison between simulated fl ow visualization (left) and smoke visualization test (right)
temperature distribution were also
found to be in good agreement with the
experimental data. A deviation of less
than 2 % was achieved (see Figures 6
and 7).
The effect of the OR fixtures on the airflow was
also assessed. Figure 8 shows the flow field
in the vicinity of the operating table, where a
recirculation zone was predicted. A smoke
visualization test was also performed and
confirmed this finding.
Through simulations, the observation
was made that most medical devices
(X-ray C-Bow, OR lighting, etc.),
being located directly under the LAF
ceiling, interrupt the protective TLAF
fl ow, thereby posing an additional
contamination risk. Additional turbulence
zones introduced by airfl ow recirculation
around the dummies ultimately cause
impure air to fl ow from the outer area
to the protected area, which increases
the risk of microbiological contamination
(see Figure 9).
CONCLUSION
Using CFD simulation, reliable
predictions, both general and
specific, about the airflow behavior
and temperature distribution in
the OR can be made. Furthermore,
ventilation parameters can be
optimized and general improvements
suggested. The CFD results
presented here clearly show that
the Opragon ventilation system
is a step in the right direction.
Nevertheless, they also indicate
that ventilation technology in the
OR can only function effectively if
it is successfully combined with
optimized medical devices/fixtures
and optimal work procedures.
REFERENCES:
[1] Robert Koch-Institut: Krankenhaushygiene Basisdaten stationärer Krankenhausversorgung in Deutschland – nosokomiale Infektionen,
Epidemiologisches Bulletin Nr. 36, 13.09.2010
[2] Rüdiger Külpmann, Kurt Hildebrand: OP-Lüftungssysteme im Vergleich, GI – Gebäude Technik | Innenraum-Klima, Vol. 134, No. 01, pp. 12–29, 2013
46 SPECIAL REPORT