Method of fixing titanium pectus bar in surgical correction of funnel chest and its mathematical modeling

The most common surgery for the correction of congenital funnel chest in 21st century is Nuss procedure. This intervention accompanied by complications related to actual fixing bar and its size placement methods fixing. these are displacement chronic postoperative pain. Only one corrective (thickness, width) used this type operation all age groups. Purpose – develop implement original modification procedure with individual calculation minimum dimensions bar; eliminate probability displacement; reduce duration intensity Materials methods. method correcting titanium as a monolithic metal arched structure rigidly fixed ends was study, subperiostal fastening stabilizers two ribs on each side used. operate 34 patients aged from 6 17 years. Results. Mathematical modeling functioning determination strength rigidity were performed. As an example, when calculating stiffness plate width 12 mm thickness 2.2 under use load 25 kg (250 N) arch 20 cm, we determine deflection 3.57 mm, factor 1.8. loads 250 N much higher than those that actually exist. cases depression thorax (deflection bar) eruption non indicated. analyzis level pain syndrome NRSP scale 4–5 days after II degree determined average score 3.74; III 4.18; month 1.0 1.63, respectively. Chronic not noted. Conclusions. Rigid subptriostal fixation bat prevents shifting. proposed mathematical allows individually calculate bar, providing vast majority deformation bars 10, 11, mm. less standard technique due redistribution pressure fulcrums absence injury intercostal nerves, reducing plate. research carried out accordance principles Helsinki declaration. study protocol approved Zhytomyr Regional Pediatric Clinical Hospital Council, Ukraine. informed consent patient obtained conducting studies. No conflict interest declared authors. Key words: procedure, chest, bardimensions, fixation.