Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet

Abstract This study investigated the fluid–tissue interaction of needle-free injection by evaluating the dynamics of the cavity induced in body-tissue simulant and the resulting unsteady mechanical stress field. Temporal evolution of cavity shape, stress intensity field, and stress vector field duri...

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Autores principales:	Yuta Miyazaki, Masashi Usawa, Shuma Kawai, Jingzu Yee, Masakazu Muto, Yoshiyuki Tagawa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bca084f0d09449d4a94f94cf0e0ec0de
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spelling	oai:doaj.org-article:bca084f0d09449d4a94f94cf0e0ec0de2021-12-02T16:14:02ZDynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet10.1038/s41598-021-94018-62045-2322https://doaj.org/article/bca084f0d09449d4a94f94cf0e0ec0de2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94018-6https://doaj.org/toc/2045-2322Abstract This study investigated the fluid–tissue interaction of needle-free injection by evaluating the dynamics of the cavity induced in body-tissue simulant and the resulting unsteady mechanical stress field. Temporal evolution of cavity shape, stress intensity field, and stress vector field during the injection of a conventional injection needle, a proposed highly focused microjet (tip diameter much smaller than capillary nozzle), and a typical non-focused microjet in gelatin were measured using a state-of-the-art high-speed polarization camera, at a frame rate up to 25,000 f.p.s. During the needle injection performed by an experienced nurse, high stress intensity lasted for an order of seconds (from beginning of needle penetration until end of withdrawal), which is much longer than the order of milliseconds during needle-free injections, causing more damage to the body tissue. The cavity induced by focused microjet resembled a funnel which had a narrow tip that penetrated deep into tissue simulant, exerting shear stress in low intensity which diffused through shear stress wave. Whereas the cavity induced by non-focused microjet rebounded elastically (quickly expanded into a sphere and shrank into a small cavity which remained), exerting compressive stress on tissue simulant in high stress intensity. By comparing the distribution of stress intensity, tip shape of the focused microjet contributed to a better performance than non-focused microjet with its ability to penetrate deep while only inducing stress at lower intensity. Dynamic mechanical interaction revealed in this research uncovered the importance of the jet shape for the development of minimally invasive medical devices.Yuta MiyazakiMasashi UsawaShuma KawaiJingzu YeeMasakazu MutoYoshiyuki TagawaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yuta Miyazaki Masashi Usawa Shuma Kawai Jingzu Yee Masakazu Muto Yoshiyuki Tagawa Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
description	Abstract This study investigated the fluid–tissue interaction of needle-free injection by evaluating the dynamics of the cavity induced in body-tissue simulant and the resulting unsteady mechanical stress field. Temporal evolution of cavity shape, stress intensity field, and stress vector field during the injection of a conventional injection needle, a proposed highly focused microjet (tip diameter much smaller than capillary nozzle), and a typical non-focused microjet in gelatin were measured using a state-of-the-art high-speed polarization camera, at a frame rate up to 25,000 f.p.s. During the needle injection performed by an experienced nurse, high stress intensity lasted for an order of seconds (from beginning of needle penetration until end of withdrawal), which is much longer than the order of milliseconds during needle-free injections, causing more damage to the body tissue. The cavity induced by focused microjet resembled a funnel which had a narrow tip that penetrated deep into tissue simulant, exerting shear stress in low intensity which diffused through shear stress wave. Whereas the cavity induced by non-focused microjet rebounded elastically (quickly expanded into a sphere and shrank into a small cavity which remained), exerting compressive stress on tissue simulant in high stress intensity. By comparing the distribution of stress intensity, tip shape of the focused microjet contributed to a better performance than non-focused microjet with its ability to penetrate deep while only inducing stress at lower intensity. Dynamic mechanical interaction revealed in this research uncovered the importance of the jet shape for the development of minimally invasive medical devices.
format	article
author	Yuta Miyazaki Masashi Usawa Shuma Kawai Jingzu Yee Masakazu Muto Yoshiyuki Tagawa
author_facet	Yuta Miyazaki Masashi Usawa Shuma Kawai Jingzu Yee Masakazu Muto Yoshiyuki Tagawa
author_sort	Yuta Miyazaki
title	Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
title_short	Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
title_full	Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
title_fullStr	Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
title_full_unstemmed	Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
title_sort	dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bca084f0d09449d4a94f94cf0e0ec0de
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Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet

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