籍著使用不同材質的導尿管我們對16位長期膀胱造瘻病患研究其細菌菌落及結石痂垢情形，其濃尿、菌尿及導尿管細菌培養出細菌的發生率各為84%、95%及97.9，尿液及導尿管細菌培養最常見的細菌為變形桿菌，假單孢菌次之。導管培養比尿液培養分離出較多的菌種。電子顯微鏡下觀察，所也導尿管都有結石痂垢形成，其中以apatite最多，struvite次之，有60%的導尿管可以直接在電子顯微鏡下看到細菌，我們的結果顯示不同材質導尿管無法預防結石痂垢產生及泌尿道感染，然而塗以親水膠的橡膠導尿管其細菌學方面並無顯著的差異，但是在電子顯微鏡下，純矽導尿管的細菌發現率較低(2/6)。

By using different catheter materials, we studied the bacteriology and stone encrus-tations of 16 patients with long-term suprapubic cystostomy. The incidence of pyuria. bacteriuria and positive catheter culture were 84.0%, 95.6% and 97.9% respectively.The commonent isolated bacteria in urine and catheter were proteus mirabilis followed by pseudomonas aeruginosa. Catheter culture can yield more bacterial species than urine culture. All catheters had crystal depositions, qpatite (79.5%), and struvite (57.1%) were the commonest crystals found by scanning electron microscopy. Bacteria can be directly detected under scanning electron microscopy in 60% of the cases. The results suggested that different catheter materials prevent stone encrustation and urinary tract infection in long-term suprapubic patients. But hydrogel coated latex catheter seemed to have less encrustation. In additon, there was no significant differ-ence of the bacteriology in different catheter materials. Howwver less bacterial positive rate(2/6) was found on scanning electron microscopy in pure silicone catheter.