Balloon for catheter and balloon catheter

1. A balloon for a catheter, comprising:

a film body that is inflatable and deflatable by a fluid supplied from a catheter,

wherein said film body includes a hard layer containing a polyamide and a flexible layer formed on the hard layer and containing a polyamide elastomer having a Shore D hardness that is 56 to 62, and a content of amide units of the polyamide elastomer in the flexible layer is not less than 60 wt %,

wherein the amide units of the polyamide elastomer in the flexible layer include repeating units of at least one of the following formula (1) or (2):

in which n is an integer of 5 to 11;

in which a is an integer of 4 to 12 and b is an integer of 4 to 10.

2. The balloon for a catheter according to claim 1 , wherein the film body comprises a connection portion axially extending from an end of said film body, wherein the connection portion is capable of being connected to the catheter.

3. The balloon for a catheter according to claim 1 , wherein said polyamide elastomer is made of at least one polyamide block copolymer represented by the following formula (3) or (4):

in which a is an integer of 4 to 12, b is an integer of 4 to 10, c is an integer of 0 to 100, d is an integer of 0 to 100, p is an integer of 2 to 4, q is an integer of 1 to 100, and Ln is a linker moiety represented by —C(O)—R—C(O)—wherein R represents an alkylene group having 2 to 12 methylene units;

in which n is an integer of 5 to 11, m is an integer of 0 to 100, I is an integer of 0 to 100, p is an integer of 2 to 4, q is an integer of 1 to 100, and L is a linker moiety represented by —C(O)—R—C(O)—wherein R represents an alkylene group having 2 to 12 methylene units.

4. The balloon for a catheter according to claim 3 , wherein R in formula (3) or (4) is selected from the group consisting of: a tetramethylene group, a 2-methylpropylene group, a 1,1-dimethylethylene group, an n-pentylene group, an n-hexylene group, an n-nonylene group, a 1-methyloctylene group, a 6-methyloctylene group, a 1-ethylheptylene group, a 1-(n-butyl)pentylene group, a 4-methyl-1-(n-propyl)pentylene group, a 1,5,5-trimethylhexylene group, a 1,1,5-trimethylhexylene group, an n-decylene group, a 1-methylnonylene group, a 1-ethyloctylene group, a 1-(n-butyl)hexylene group, a 1,1-dimethyloctylene group, a 3,7-dimethyloctylene group, an n-undecylene group, and a 1-methyldecylene group.

5. The balloon for a catheter according to claim 1 , wherein the flexible layer includes a first flexible layer and a second flexible layer, wherein the first flexible layer is attached to a surface of the hard layer and is in intimate contact with the surface of the hard layer, and the second flexible layer is attached to an opposite surface of the hard layer and is in intimate contact with the opposite surface of the hard layer.

6. The balloon for a catheter according to claim 1 , wherein the flexible layer is in intimate contact with a surface of the hard layer.

7. The balloon for a catheter according to claim 1 , wherein an average thickness of the flexible layer is 0.5 to 10 μm.

8. The balloon for a catheter according to claim 1 , wherein an average thickness of the hard layer is 0.5 to 49.5 μm.

9. The balloon for a catheter according to claim 1 , wherein the amide units of the polyamide elastomer contained in the flexible layer and polymer chains of the polyamide contained in the hard layer, are bonded together.

10. The balloon for a catheter according to claim 1 , wherein the flexible layer and the hard layer are subjected to thermocompression bonding.

11. The balloon for a catheter according to claim 1 , wherein a weight-average molecular weight of the polyamide elastomer is 1.0×10 4 to 1.0×10 5 .

12. The balloon for a catheter according to claim 1 , wherein the polyamide is made of at least one selected from the group consisting of nylon 11, nylon 12 and nylon 6.12.

13. A balloon catheter, comprising the balloon for a catheter according to claim 1 , and a catheter.

14. A balloon catheter, comprising:

an inner tube having a first lumen opened at a distal end thereof;

an outer tube coaxially provided with said inner tube, having a distal end distance from the distal end of said inner tube toward a proximal end at a given length, and having a second lumen between an outer surface of said inner tube and the outer tube;

a hub having an opening communicating with said second lumen; and

a balloon fixed to said inner tube at a distal end thereof, fixed to said outer tube at a proximal end thereof, and communicating in the inside thereof with said second lumen, wherein a fluid is charged or discharged from said opening to inflate or deflate said balloon,

wherein the balloon comprises a film body, wherein said film body includes a hard layer containing a polyamide and a flexible layer formed on the hard layer and containing a polyamide elastomer having a Shore D hardness that is 56 to 62, and a content of amide units of the polyamide elastomer in the flexible layer is not less than 60 wt %,

wherein the amide units of the polyamide elastomer in the flexible layer include repeating units of at least one of the following formula (1) or (2):

in which n is an integer of 5 to 11;

in which a is an integer of 4 to 12 and b is an integer of 4 to 10.

15. The balloon catheter according to claim 14 , wherein said polyamide elastomer is made of at least one polyamide block copolymer represented by the following formula (3) or (4):

in which a is an integer of 4 to 12, b is an integer of 4 to 10, c is an integer of 0 to 100, d is an integer of 0 to 100, p is an integer of 2 to 4, q is an integer of 1 to 100, and Ln is a linker moiety represented by —C(O)—R—C(O)—wherein R represents an alkylene group having 2 to 12methylene units;

in which n is an integer of 5 to 11, m is an integer of 0 to 100, I is an integer of 0 to 100, p is an integer of 2 to 4, q is an integer of 1 to 100, and L is a linker moiety represented by —C(O)—R—C(O)—wherein R represents an alkylene group having 2 to 12 methylene units.

16. The balloon catheter according to claim 14 , wherein the flexible layer includes a first flexible layer and a second flexible layer, wherein the first flexible layer is attached to a surface of the hard layer and is in intimate contact with the surface of the hard layer, and the second flexible layer is attached to an opposite surface of the hard layer and is in intimate contact with the opposite surface of the hard layer.

17. The balloon catheter according to claim 14 , wherein the amide units of the polyamide elastomer contained in the flexible layer and polymer chains of the polyamide contained in the hard layer, are bonded together.

18. The balloon catheter according to claim 14 , wherein the flexible layer and the hard layer are subjected to thermocompression bonding.