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Using an Infra-red Sensor to Measure
the Dynamic Behaviour of N 2 O Gas Escaping
Through Different Sized Holes
Alan Slade, Jan Vorstius, Daniel Gon¸alves, and Gareth Thomson
Abstract An anastomosis is a surgical procedure that consists of the re-connection
of two parts of an organ and is commonly required in cases of colorectal cancer.
Approximately 80% of the patients diagnosed with this problem require surgery.
The malignant tissue located on the gastrointestinal track must be resected and
the most common procedure adopted is the anastomosis. Studies made with 2,980
patients that had this procedure, show that the leakage through the anastomosis
was 5.1%. This paper discusses the dynamic behavior of N 2 O gas through different
sized leakages as detected by an Infra-Red gas sensor and how the sensors response
time changes depending on the leakage size. Different sized holes were made in
the rigid tube to simulate an anastomostic leakage. N 2 O gas was injected into the
tube through a pipe and the leakage rate measured by the infra-red gas sensor. Tests
were also made experimentally also using a CFD (Computational Fluid Dynamics)
package called FloWorks. The results will be compared and discussed in this paper.
1
Introduction
An anastomosis is a surgical procedure that consists of the re-connection of
two parts of an organ, and is commonly required in cases of colorectal cancer.
Approximately 80% of the patients diagnosed with colorectal cancer require surgery
[ 1 ]. The malignant tissue located on the gastrointestinal track must be resected
and the most common procedure adopted is the anastomosis [ 2 ]. Unfortunately,
A. Slade ( ) • J. Vorstius ￿ D. Gon¸alves
Medical Engineering Research Institute, University of Dundee, Dundee DD1 4HN, UK
e-mail: A.P.Slade@dunde.ac.uk ; J.B.Vorstius@dundee.ac.uk ; danielsg007@yahoo.com.br
G. Thomson
School of Engineering and Applied Science, Aston University, Aston Triangle,
Birmingham B4 7ET, UK
e-mail: G.A.Thomson@aston.ac.uk
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