Improved cannula for operative (cystic duct) cholangiography

A new S-shaped cystic duct metal cannula was developed and used successfully in 200 cystic duct cholangiograms. It has the advantage of being easy to manipulate because the configuration does not obscure the vision and the resistance is less than that of plastic tubes, facilitating injection with lower pressure. It is much cheaper than the disposable cannulas because it can be reused (autoclaved).