Modularization and Performance Evaluation of Filters for Blocking Harmful Gases in Laparoscopic Surgery
Vol. 58, No. 4, pp. 214-222,
Aug. 2021
10.12772/TSE.2021.58.214
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Abstract
In this study, to solve the problem of harmful gases in laparoscopic surgery, the
filtration efficiency of a meltblown nonwoven filter modified with hydrocharging treatment
according to the change in basis weight was investigated. Experiments were conducted
with both 35 GSM (M35) and 40 GSM (M40) using NaCl 32 LPM, and the resulting
efficiencies were 99.312% and 99.973%, respectively. A composite filter with granular activated
carbon (GAC) attached based on 20 GSM (M20) was also studied. The evaluation was
confirmed when H13 and H14 grade HEPA filters were laminated with 99.993% and
99.995% filtration efficiency, respectively, on a C filter. In addition, to confirm the effect of
moisture, experiments were conducted through four cycles after soaking in water and drying.
As a result, all nonwoven fabrics showed a slight effect due to hydrocharging, and the
HEPA grade could be maintained. However, GAC entering the composite filter confirmed
the deodorant effect with an ammonia removal rate of 95.2%, and removal rates of 99.5%,
98.5%, 98.5%, 89.2%, and 95.9% for hydrogen sulfide, trimethylamine, acetaldehyde, toluene,
and formaldehyde, respectively, were obtained. When the structure of such a composite
filter was integrated with the module of a new type of trocar, the performance of the
highly efficient filter was maintained without being affected by the clinical surgical activity
radius during laparoscopic surgery. Finally, a basic study of the applicability of new surgical
trocars for the removal of harmful gases was conducted.
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