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Biology and Medical
Puncturing blood vessels - elasticity?
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[QUOTE="Baluncore, post: 6450021, member: 447632"] Welcome to PF. Needle entry into the lumen of a vessel will be different to the penetration of an arrow, lance, or an injection deep into muscle. As I see it, initial penetration will be by the curved knife edge at the diagonal cut point of the needle. The following diagonal wedge will deflect the tissue and so control the presentation of tissue to the needle. When penetrating a vessel parallel with the surface, the orientation of the diagonal will be important in the way the needle pushes the tissue into a mound, then picks up the first vessel surface, and hopefully “threads” itself into the vessel without passing through the far wall, a bit like threading beads, without stitching them to the table cloth. Start by getting a copy of; “The Science and Engineering of Cutting” 2009, by Tony Atkins; pub; Elsevier, ISBN; 978-0-7506-8531-3 I quote from page 184,5; “ Deep penetration of highly deformable soft solids was studied by Shergold and Fleck (2005) in connexion with medical injections into the human body. Experiments show that a sharply pointed punch results in a planar crack formed in mode I. Indenting was modeled as shown in Figure 8-3. For pointed indenters, the incremental work of penetration performs work of incremental plane crack advance plus the sideways incremental elastic compression of the material which occurs as the shank of the tool displaces material from the core of the hole. The penetration pressure is greater for greater material toughness, greater elastic shear modulus and greater non-linearity; it increases as the punch radius decreases. Shergold, A., & Fleck, N. A. (2005). Experimental investigation into the deep penetration of soft solids by sharp and blunt punches, with application to the piercing of skin. ASME Journal of Biomechanical Engineering, 1–41. ” [URL]http://www-mech.eng.cam.ac.uk/profiles/fleck/papers/190.pdf[/URL] [/QUOTE]
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Puncturing blood vessels - elasticity?
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