Saudi Journal of Anaesthesia

ORIGINAL ARTICLE
Year
: 2017  |  Volume : 11  |  Issue : 1  |  Page : 15--20

Tissue type determination by impedance measurement: A bipolar and monopolar comparison


Jack Sharp1, Kaddour Bouazza-Marouf1, Dorita Noronha2, Atul Gaur2 
1 Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
2 Department of Anaesthesia, University Hospitals of Leicester NHS Trust, Leicester, Leicestershire LE1 5WW, UK

Correspondence Address:
Atul Gaur
Department of Anaesthesia, University Hospitals of Leicester NHS Trust, Leicester, Leicestershire LE1 5WW
UK

Background: In certain medical applications, it is necessary to be able to determine the position of a needle inside the body, specifically with regards to identifying certain tissue types. By measuring the electrical impedance of specific tissue types, it is possible to determine the type of tissue the tip of the needle (or probe) is at. Materials and Methods: Two methods have been investigated for electric impedance detection; bipolar and monopolar. Commercially available needle electrodes are of a monopolar type. Although many patents exist on the bipolar setups, these have not as yet been commercialized. This paper reports a comparison of monopolar and bipolar setups for tissue type determination. In vitro experiments were carried out on pork to compare this investigation with other investigations in this field. Results: The results show that both monopolar and bipolar setups are capable of determining tissue type. However, the bipolar setup showed slightly better results; the difference between the different soft tissue type impedances was greater compared to the monopolar method. Conclusion: Both monopolar and bipolar electrical impedance setups work very similarly in inhomogeneous volumes such as biological tissue. There is a clear potential for clinical applications with impedance-based needle guidance, with both the monopolar and bipolar setups. It is, however, worth noting that the bipolar setup is more versatile.


How to cite this article:
Sharp J, Bouazza-Marouf K, Noronha D, Gaur A. Tissue type determination by impedance measurement: A bipolar and monopolar comparison.Saudi J Anaesth 2017;11:15-20


How to cite this URL:
Sharp J, Bouazza-Marouf K, Noronha D, Gaur A. Tissue type determination by impedance measurement: A bipolar and monopolar comparison. Saudi J Anaesth [serial online] 2017 [cited 2021 Apr 21 ];11:15-20
Available from: https://www.saudija.org/article.asp?issn=1658-354X;year=2017;volume=11;issue=1;spage=15;epage=20;aulast=Sharp;type=0