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Smart needle electrical bioimpedance to provide information on needle tip relationship to target nerve prior to local anesthetic deposition in peripheral nerve block (USgPNB) procedures Cover

Smart needle electrical bioimpedance to provide information on needle tip relationship to target nerve prior to local anesthetic deposition in peripheral nerve block (USgPNB) procedures

Journal of Electrical Bioimpedance
Volume 14 (2023): Issue 1 (January 2023)
By: Edel Whelton,  Lisa Helen,  Brian O’Donnell,  Martin O’Sullivan,  Justina Ugwah,  Walter Messina,  Yineng Wang,  Niamh O’Mahoney and  Eric Moore  
Open Access
|Dec 2023

Figures & Tables

Fig.1:

Concept drawing of the smart needle with drug delivery tube and electrical connections.
Concept drawing of the smart needle with drug delivery tube and electrical connections.

Fig.2:

Smart needle positioned in the sciatic nerve [11].
Smart needle positioned in the sciatic nerve [11].

Fig.3:

Schematic of possible needle position within a nerve structure for bioimpedance measurement [11].
Schematic of possible needle position within a nerve structure for bioimpedance measurement [11].

Fig.4:

Bioimpedance of fat, muscle, and nerve in a freshly slaughtered pig carcass.
Bioimpedance of fat, muscle, and nerve in a freshly slaughtered pig carcass.

Fig.5:

Bioimpedance results of Sciatic A), Vagus B) and Femoral C) peripheral nerves demonstrating higher impedance at-nerve for femoral and brachial nerve and lower impedance in-nerve. The sciatic nerve has lower impedance at-nerve and higher impedance in-nerve.
Bioimpedance results of Sciatic A), Vagus B) and Femoral C) peripheral nerves demonstrating higher impedance at-nerve for femoral and brachial nerve and lower impedance in-nerve. The sciatic nerve has lower impedance at-nerve and higher impedance in-nerve.

Fig.6:

Ratio of neural to connective tissue in sciatic nerve in pig model 4 is represented in a) above & image of a stained sciatic nerve clearly defining locations of neural and connective tissue. Percentages of neural to connective tissue in pig 3 & 6 are represented in b) above demonstrating Percentages in other pig models are close to ratio of 1:1 in sciatic nerves evaluated.
Ratio of neural to connective tissue in sciatic nerve in pig model 4 is represented in a) above & image of a stained sciatic nerve clearly defining locations of neural and connective tissue. Percentages of neural to connective tissue in pig 3 & 6 are represented in b) above demonstrating Percentages in other pig models are close to ratio of 1:1 in sciatic nerves evaluated.

Fig.7:

The ratio of neural to connective tissue in femoral nerve in pig model 3 is represented in a) above & image of a stained femoral nerve clearly defining locations of neural and connective tissue. The percentages of neural to connective tissue in pig 1 & 5 is represented in b) above demonstrating Percentages in other pig models are close to ratio of 1.9:1 in femoral nerves evaluated.
The ratio of neural to connective tissue in femoral nerve in pig model 3 is represented in a) above & image of a stained femoral nerve clearly defining locations of neural and connective tissue. The percentages of neural to connective tissue in pig 1 & 5 is represented in b) above demonstrating Percentages in other pig models are close to ratio of 1.9:1 in femoral nerves evaluated.

Fig.8:

Ratio of neural to connective tissue in vagus nerve in pig model 7 is represented in a) above & image of a stained vagus nerve clearly defining locations of neural and connective tissue. Percentages of neural to connective tissue in pig 6 & 4 are represented in b) it can be observed that neural tissue is more abundant than connective tissue in other pig models in vagus nerves evaluated when compared to pig model 7.
Ratio of neural to connective tissue in vagus nerve in pig model 7 is represented in a) above & image of a stained vagus nerve clearly defining locations of neural and connective tissue. Percentages of neural to connective tissue in pig 6 & 4 are represented in b) it can be observed that neural tissue is more abundant than connective tissue in other pig models in vagus nerves evaluated when compared to pig model 7.
DOI: https://doi.org/10.2478/joeb-2023-0007 | Journal eISSN: 1891-5469
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Language: English
Page range: 53 - 59
Submitted on: Apr 28, 2023
Published on: Dec 31, 2023
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Bioimpedance,
current,
voltage,
peripheral nerves,
connective tissue,
neural tissue,
anesthetic,
smart needle
Related subjects:
Engineering,
Bioengineering and biomedical engineering,
Biomedical electronics,
Life sciences,
Biophysics,
Medicine,
Biomedical engineering,
Physics,
Spectroscopy and metrology

© 2023 Edel Whelton, Lisa Helen, Brian O’Donnell, Martin O’Sullivan, Justina Ugwah, Walter Messina, Yineng Wang, Niamh O’Mahoney, Eric Moore, published by University of Oslo
This work is licensed under the Creative Commons Attribution 4.0 License.

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