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DTSTAMP:20260424T062827Z
UID:1700557200@ist.ac.at
DTSTART:20231121T100000
DTEND:20231121T110000
DESCRIPTION:Speaker: Pedro M. Reis\nhosted by Scott Waitukaitis\nAbstract: 
 Knots\, the weakest link in a suture\, are central to surgical procedures\
 , where they are used as ligatures to bind surgical threads during suturin
 g. Massive bleeding may occur when the suture loop surrounding a vessel be
 comes untied or breaks. In high-tension closures\, such as tendon repairs\
 , knot unraveling rates can be as high as 86%. Even if the need for mechan
 ical analysis of knots has long been recognized in the medical profession\
 , established guidelines for best practices rely primarily on empirical kn
 owledge\, not on structural analysis. More broadly\, physical knots are co
 mplex functional structures involving the coupling of a nontrivial set of 
 ingredients: topology\, geometry\, elasticity\, contact\, friction\, and p
 lasticity. In this talk\, we will present results from an investigation on
  surgical knots' operational and safety limits\, highlighting the previous
 ly overlooked but crucial effect of plastic deformation. We analyze the su
 tures produced by an experienced surgeon in a model system. The relevant r
 ange of applied tensions and geometric features are characterized through 
 mechanical testing and X-ray tomographic imaging. From a thorough analysis
  where we vary the tying tension and the number of throws in the system\, 
 we find a clear relationship between the number of half-hitches and the ne
 cessary untying tension of the suture. Our unprecedented experimental data
  from surgeon-tied sutures and model systems\, combined with finite elemen
 t simulations\, enable us to rationalize the primary ingredients dictating
  the mechanical performance of surgical knots. These findings could have p
 otential applications in the training of surgeons and control of robotic-a
 ssisted surgical devices.
LOCATION:Moonstone\, Ground floor\, Seminar Room F\, ISTA
ORGANIZER:
SUMMARY:Pedro M. Reis: Why do surgeons sleep better with plasticity in thei
 r knots?
URL:https://talks-calendar.ista.ac.at/events/4584
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