Purpose: to analyze the possibilities of improving structural and functional design principles of endoscopic instruments to solve existing problems in hepatobiliary surgery. Object and research methods. The article presents an overview of the problems and complications associated with both traditional and minimally invasive methods of surgical interventions in the pathology of the hepatobiliary zone, demonstrates their analysis, and suggests methods of solving them with the help of new useful models. The technical details of new drainage models for external-internal biliary-jejunal drainage, endoscopic sphincter of Oddi dilator and pusher for endobiliary stone translocation are described. Features of proprietary endoscopic instruments are highlighted, distinct advantages in design and functionality are demonstrated, and comprehensive information is provided on the potential impact on solving specific problems associated with the use of analog models. The results. The prospects of creating new principles and useful models for improving the methods of surgical interventions on the organs of the hepatopancreatobiliary system based on the proposed structural and functional design principles of endoscopic instruments are revealed. Conclusion. The presented model tools due to the successful use of features of structural and functional principles of technical design and improved design allow to change the approach to the complications that exist today, associated with the use of common analog tools.