| 摘要 |
A biopsy needle for removal of tissue from a patient includes an outer tube having a distal end that has an inner diameter (ID<SUB>tip</SUB>) and an inner tube within said outer tube and having an inner diameter (ID<SUB>sc</SUB>), defined at the distalmost section of the inner tube. The needle also includes a snare having a first end connected to the inner tube and a second end coupled to the outer tube. The snare has a variable diameter that is controlled by rotation of the inner tube with respect to the outer tube in a prescribed direction resulting in the opening and closing, respectively, of the snare. A ratio (R) that is defined by (ID<SUB>sc</SUB>)/ (ID<SUB>tip</SUB>) is greater than 1.
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