Terumo Kabushiki Kaisha

Mariko Maruyama

Yuya Otake

Tetsuya Fukuoka

Koichiro Tashiro

Kota Hamuro

Kouta Hamuro

Mitsuteru Yasunaga

Takito Inukai

A catheter that includes an inner layer forming the inner surface of a tubular catheter main body having a lumen, an outer layer forming the outer surface of the catheter main body, and multiple reinforcements embedded between the inner surface and the outer surface. The inner diameter of the catheter main body is D, the outer diameter is D, the wall thickness is T, a thickness of each reinforcement is T, an effective width of each reinforcement is W, and a total number of the multiple reinforcements is N. The catheter satisfies Expressions (1), (2), and (3):0.050 mm&#x2264;1&#x2264;0.100 mm&#x2003;&#x2003;Expression (1)21&#x2265;0.25&#x2003;&#x2003;Expression (2)60,000&#x2264;(12)/(12)&#x3c;1,000,000&#x2003;&#x2003;Expression (3).

Catheter

A catheter is disclosed having a distal end portion of a shaft with high breaking strength even if a wall thickness of the distal end portion of the shaft is relatively small. The catheter includes an elongated tube shaped shaft. The shaft has an inner layer having a lumen along a longitudinal direction, an outer layer covering an outer peripheral side of the inner layer, and a reinforcement body disposed on the outer peripheral side of the inner layer. The outer layer has a distal outer layer on a distal end portion of the shaft, an intermediate outer layer proximal to the distal outer layer, and a proximal outer layer proximal to the intermediate outer layer. The intermediate outer layer is more flexible and thicker than the proximal outer layer, and a distal end of the reinforcement body is located proximal to a distal end of the intermediate outer layer.

A catheter that includes an inner layer forming the inner surface of a tubular catheter main body having a lumen, an outer layer forming the outer surface of the catheter main body, and multiple reinforcements embedded between the inner surface and the outer surface. The inner diameter of the catheter main body is D, the outer diameter is D, the wall thickness is T, a thickness of each reinforcement is T, an effective width of each reinforcement is W, and a total number of the multiple reinforcements is N. The catheter satisfies Expressions (1), (2), and (3):0.050 mm&#x2264;1&#x2264;0.100 mm&#x2003;&#x2003;Expression (1)2/1&#x2265;0.25&#x2003;&#x2003;Expression (2)60,000&#x2264;(1&#xd7;2&#xd7;)/(12)&#x3c;1,000,000&#x2003;&#x2003;Expression (3).

A catheter assembly includes an outer catheter and an inner catheter. The inner catheter has an accommodation unit which can be positioned on a farther distal side than an outer catheter body in a state where an inner catheter body is inserted into the outer catheter body, extends in a proximal direction from the inner catheter body, and can accommodate an outer catheter distal portion so as to surround an outer circumference thereof in a state where the outer catheter distal portion formed at a distal end of the outer catheter body is reduced in diameter. The outer catheter distal portion can be separated from the accommodation unit and can expand in diameter by moving the inner catheter body in a distal end direction relatively with respect to the outer catheter body from a state of being accommodated in the accommodation unit.

Catheter assembly

A catheter is disclosed which has at least a two-layered structure and can suppress decrease in function thereof by suppressing the disorder at an interface between layers during use, and a method for manufacturing the same. The catheter has an inner layer as a tube shaped body made of a thermoplastic resin and an outer layer, as a tube shaped body made of a thermoplastic resin, coming into contact with the outer surface of the inner layer, and has a reinforcement member which is at least partially embedded in the inner layer and includes a gap leading the inner layer toward the radial outside of the catheter. The inner layer has a protrusion which extends in an axial direction of the catheter while protruding from the gap to the radial outside, is positioned on the radial outside of the reinforcement member, and ingrows into the outer layer.

Growing community of inventors

Fujinomiya, Japan

Mariko Maruyama