医生在手术中使用了导管来注入药物。

The doctor used a ___catheter to administer medication during the surgery.

护士给病人插了导尿管来输液。

The nurse inserted a ___catheter to administer fluids to the patient.

医生通过导管向患者的心脏注射了造影剂。

The doctor injected contrast dye into the patient's heart through a ___catheter.