Medical tube

1. A medical tube in which an intermediate layer comprising a dried composition containing (a), (b), and (c1) listed below and a lubricant layer comprising a dried composition containing (a), (b), and (c2) listed below are sequentially laminated on a surface of an insertion member to be inserted into a living body:

(a) 1 to 35 weight % of aromatic diisocyanate;

(b) 1 to 18 weight % of trifunctional or higher functionality polyol;

(c1) 47 to 98 weight % of polyalkylene glycol having a weight-average molecular weight of 2000 or more and 6000 or less; and

(c2) 47 to 98 weight % of polyalkylene glycol having the weight-average molecular weight of 20000 or more and 40000 or less, where each of the glycols in (c1) and (c2) is diol.

2. The medical tube according to claim 1 , wherein component (c2) includes 10 to 50 weight % of the component (c1).

3. The medical tube according to claim 1 or 2 , obtained by coating and drying an intermediate layer coating liquid containing the components (a), (b), (c1) and a solvent, and a lubricant layer coating liquid containing the components (a), (b), (c2) and a solvent, wherein the concentration of the total amount of the components (a), (b), and (c1) in the intermediate layer coating liquid is equal to or less than total the concentration of the total amount of the components (a), (b), and (c2) in the lubricant layer coating liquid.

4. The medical tube according to claim 3 , wherein

the concentration of the total amount of the components (a), (b), and (c1) in the intermediate layer coating liquid is 0.1 to 10 weight %, and

the concentration of the total amount of the components (a), (b), and (c2) in the lubricant layer coating liquid is 1.0 to 10 weight %.

5. The medical tube according to claim 1 , wherein a composition of the intermediate layer contains a pre-polymer formed by pre-reaction of at least part of the components (a), (b), and (c1) and/or a composition of the lubricant layer contains a pre-polymer formed by pre-reaction of at least part of the components (a), (b), (c1), and (c2).

6. The medical tube according to claim 1 , wherein the composition of the intermediate layer is a reaction product obtained by reaction of the components (a), (b), and (c1), and/or the composition of the lubricant layer is a reaction product obtained by reaction of the components (a), (b), (c1), and (c2).

7. The medical tube according to claim 1 , wherein a material for the insertion member comprises at least one selected from a group consisting of silicon resin, isobutylene block copolymer, thermoplastic polyurethane resin, and polyamide resin.

8. The medical tube according to claim 1 , wherein the medical tube is a lacrimal duct tube to be inserted into a lacrimal duct and to be placed in the same.

9. The medical tube according to claim 8 , wherein the material for the insertion member comprises a thermoplastic polyurethane resin and an isobutylene block copolymer.

10. A production method of the medical tube according to claim 1 , comprising the steps of:

preparing an intermediate layer coating liquid containing the components (a), (b), (c1) and a solvent; and

preparing a lubricant layer coating liquid containing the components (a), (b), and (c2) and a solvent, so as to contain 10 to 50 weight % of the intermediate layer coating liquid.

11. The production method of the medical tube according to claim 10 , comprising the steps of:

coating the intermediate layer coating liquid containing the components (a), (b), (c1) and the solvent on the insertion member;

drying the intermediate layer coating liquid;

coating the lubricant layer coating liquid in which the concentration of the total amount of the components (a), (b), and (c2) is equal to or larger than the concentration of the total amount of the components (a), (b), and (c1) of the intermediate layer coating liquid; and

drying the lubricant layer coating liquid, thereby to laminate in sequence the intermediate layer and the lubricant layer on the surface of the insertion member.

12. The production method of the medical tube according to claim 11 , wherein

the concentration of the total amount of the components (a), (b), and (c1) in the intermediate layer coating liquid is 0.1 to 10 weight %, and

the concentration of the total amount of the components (a), (b), and (c2) in the lubricant layer coating liquid is 1.0 to 10 weight %.

13. The production method of the medical tube according to any of claims 10 to 12 , wherein comprising the steps of coating the intermediate layer coating liquid and/or the lubricant layer coating to the placement member is dipping, coating by a sponge including the intermediate layer coating liquid and/or the lubricant layer coating, coating by a brush including the intermediate layer coating liquid and/or the lubricant layer coating, or spraying.

14. The medical tube according to claim 1 , wherein

the intermediate layer including the composition that contains the (a) in an amount of 5 to 30 weight %.

15. The medical tube according to claim 1 , wherein

the intermediate layer including the composition that contains the (b) in an amount of 3 to 25 weight %, and

the lubricant layer including the composition that contains the (b) in an amount of 2 to 25 weight %.

16. The medical tube according to claim 1 , wherein

the intermediate layer including the composition that contains the (c1) in an amount of 40 to 95 weight %.

17. The medical tube according to claim 1 , wherein

the lubricant layer including the composition that contains the (c2) in an amount of 40 to 95 weight %.

18. The medical tube according to claim 1 , wherein

the amount of the aromatic diisocyanate (a) is 3 to 35 weight %.

19. The medical tube according to claim 1 , wherein

the amount of the aromatic diisocyanate (a) is 5 to 20 weight %,

the amount of the trifunctional or higher functionality polyol (b) is 3 to 15 weight %,

the amount of the polyalkylene glycol (c1) is 50-98 weight %, and

the amount of the polyalkylene glycol (c2) is 50-98 weight %.