Multilayer body, multilayer hollow body, and catheter with multilayer hollow body
A multilayer body, a multilayer hollow body, and a catheter with a multilayer hollow body each have improved torque transmissibility to one end when the other end is rotated rightward or leftward. The multilayer hollow body includes a single-strand hollow body that is formed by winding one element wire, an inner multi-strand hollow body that is disposed adjacently to an inner periphery of the single-strand hollow body and is formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body, and an outer multi-strand hollow body that is disposed adjacently to an outer periphery of the single-strand hollow body 7 and is formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body.
1. A multilayer body comprising:
a single-strand hollow body that is a coil body formed by winding only one element wire;
an inner multi-strand hollow body that is disposed adjacently to an inner periphery of the single-strand hollow body and that is a coil body formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body; and
an outer multi-strand hollow body that is disposed adjacently to an outer periphery of the single-strand hollow body and that is a coil body formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body
wherein at a longitudinal position of the multilayer body, a twisting angle of the single-strand hollow body is larger than a twisting angle of the inner multi-strand hollow body and a twisting angle of the outer multi-strand hollow body, and the twisting angle of the outer multi-strand hollow body is larger than the twisting angle of the inner multi-strand hollow body.
2. The multilayer body according to claim 1 , further comprising:
a braid that is disposed adjacently to an inner periphery of the inner multi-strand hollow body.
3. The multilayer body according to claim 2 , further comprising:
an inner layer that is disposed adjacently to an inner periphery of the braid; and
an outer layer that covers the inner layer, the braid, the single-strand hollow body, the inner multi-strand hollow body, and the outer multi-strand hollow body.
4. A catheter, comprising:
the multilayer body according to claim 1 ;
a distal end tip that is connected to a distal end of the multilayer body; and
a connector that is connected to a proximal end of the multilayer body.
5. A catheter comprising:
an inner layer;
the multilayer body according to claim 1 disposed on an outer periphery of the inner layer;
an outer layer that covers the inner layer and the multilayer body;
a distal end tip that is connected to a distal end of the inner layer and a distal end of the outer layer, wherein a distal end of the multilayer body protrudes into the distal end tip; and
a connector that is connected to a proximal end of the inner layer, a proximal end of the outer layer, and a proximal end of the multilayer body.