Terumo Kabushiki Kaisha

Naoko Katou

Yasunori Yamashita

Youichi Ito

Tooru Oota

Youichi Itou

A first tube is a medical tube provided with a first portion, a second portion and a third portion in this order from the proximal end side toward the distal end side and is made of a resin. At the second portion, the outer diameter is smaller than the outer diameter of the first portion and the inner diameter is substantially equal to the inner diameter of the first portion. At the third portion, the outer diameter and the inner diameter are respectively smaller than the outer diameter and the inner diameter of the second portion. In this manner, a medical tube in which the outer diameter of the proximal end side is relatively large and the outer diameter of the distal end side is relatively small while securing the inner diameter having a sufficient size at the distal end side can be provided.

Medical tube, catheter, and method for producing medical tube

A medical tube includes a first portion, a second portion, a third portion, and a fourth portion in this order from a proximal side to a distal side thereof. The first portion has a tubular resin layer, the second portion has a tubular inner layer and outer layer, the third portion as an inner layer and outer layer, and the fourth portion has a tubular resin layer. When flexural rigidity of the first portion, the second portion, the third portion, and the fourth portion is G, G, G, and G, respectively, the flexural rigidity of each portion being configured to have a relationship with each other portion based upon the following expression (1):G&#x3e;G&#x3e;G&#x3e;G&#x2003;&#x2003;(1).

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Shizuoka, Japan

Naoko Katou