A NEW MODEL OF THERAPEUTIC DUODENOSCOPE [COLYMPUS TJF-X (PROTOTYPE), JF-1T]: A MULTI-PURPOSE INSTRUMENT

Abstract

A new model of therapeutic duodenoscope equipped with a large catheter channel (7 French) and an objective lens tilted 15° backwards was used for various diagnostic and therapeutic procedures such as endoscopic sphincterotomy, basket catheter extraction, emergency decompression of the obstructed common bile duct, intracholedochal indwelling of a 7 French tube for external drainage, balloon catheter cholangiography and microtransducer manometry of the pancreatic and common bile ducts in a total of 353 endoscopies in 162 patients, a considerable proportion of whom had each procedure performed repeatedly or underwent two or more different methods. The slight reverse tilt of the objective lens allowed easier selective bile duct cannulation. The large channel facilitated safe manipula tion of the fragile tip of a balloon or microtransducer catheter. It also permitted prompt aspiration of intraduodenal air and contents; this was practically of great benefit in carrying out. these rather complex procedures quickly. This model, particularly the improved type, JF-1T, was found to be suitable for multi-purpose use due to its superior functions and maneuverability.