| 摘要 |
A medical insertion assisting tool which involves a small resistance at the time of insertion into organic tissue, will not cause a feeling of discomfort and pain to a patient and is not likely to injure the organic tissue, and a medical insertion assisting tool which is not likely to cause kink and involves a small resistance upon insertion of a catheter thereinto. A medical insertion assisting tool comprises a tubular sheath having a lumen, a sheath hub connected to the proximal end of the sheath, a tubular dilator having a lumen, and a dilator hub connected to the proximal end of the dilator. The dilator comprises a first diameter expansion portion gradually increasing in diameter toward the proximal end of the dilator from the distal end thereof, a second diameter expansion portion increasing in diameter more gently and gradually than the first diameter expansion portion does, a diameter contraction portion gradually decreasing in diameter, and a drum portion having a substantially constant outside diameter. The dilator is inserted into the lumen of the sheath, the inner wall of the distal end of the sheath is brought into close contact with the outer wall of the diameter contraction portion of the dilator, and even when the dilator and the sheath are bent, the distal end of the sheath is in close contact with the outer wall of the dilator.
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