Needle insertion-induced quasiperiodic cone cracks in hydrogel

Muthukumar, M and Bobji, MS and Simha, KRY (2021) Needle insertion-induced quasiperiodic cone cracks in hydrogel. In: Soft Matter, 17 (10). pp. 2823-2831.

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Abstract

Needle insertion, a standard process for various minimally invasive surgeries, results in tissue damage which sometimes leads to catastrophic outcomes. Opaqueness and inhomogeneity of the tissues make it difficult to observe the underlying damage mechanisms. In this paper, we use transparent and homogeneous polyacrylamide hydrogel as a tissue mimic to investigate the damages caused during needle insertion. The insertion force shows multiple events, characterised by a gradual increase in the force followed by a sharp fall. Synchronised recording of the needle displacement into the gel shows that each event corresponds to propagation of stable cone crack. Though sporadic uncontrolled cracking has been discussed earlier, this is the first report of nearly periodic, stable and well-controlled 3-D cone cracks inside the hydrogel during deep penetration. We show that the stress field around the needle tip is responsible for the symmetry and periodicity of the cone cracks. These results provide a better understanding of the fracture processes in soft and brittle materials and open a promising perspective in needle designs and the control of tissue damages during surgical operations. © The Royal Society of Chemistry 2021.

Item Type:	Journal Article
Publication:	Soft Matter
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry
Keywords:	Hydrogels; Needles; Surgery; Tissue, Damage mechanism; Deep penetration; Fracture process; Inhomogeneities; Minimally invasive surgery; Needle insertion; Polyacrylamide hydrogels; Surgical operation, Cracks
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	19 Apr 2021 11:33
Last Modified:	19 Apr 2021 11:33
URI:	http://eprints.iisc.ac.in/id/eprint/68634

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