Design and Implementation of Capnograph for Laparoscopic Surgery
Keywords:
End-tidal CO2 rate, sidestream capnograph. End-tidal CO2 rate, sidestream capnograph.Abstract
Capnography is a non-invasive method of
monitoring the concentration of partial pressure of carbon
dioxide. Nowadays, the application of capnography is a
standard for general anesthesia. In this research, we design and
implement sidestream capnograph based on microcontroller
that can estimate the concentration of CO2 in the respiratory
gases and measure respiratory rate. The accuracy of the
prototype EtCO2 and RR has been verified relative to NT1D
Series Handheld Vital Signs Monitor from Solaris Medical
Technology Inc. in two chances of operation. The overall bias
for EtCO2 based on relative verification between prototype and
NT1D Series is 5.58% and -1.17% respectively whereas the
overall bias for RR is -0.62 bpm and -0.29 bpm respectively.
The correction feature to handle interference due to presence of
gases such as sevoflurane, N2O and O2 is also implemented in
the firmware.
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