trocar

例句：

1. 1. The doctor inserted a urethral catheter to relieve the patient's pain.
   医生插入了一根导尿管来缓解病人的疼痛。
2. 2. The nurse carefully removed the urethral catheter after the procedure.
   护士在手术结束后小心地取出了导尿管。
3. 3.The patient was given a urethral catheter for comfort during the night.
   为了病人夜间的舒适，他们给患者使用了导尿管。