Synthetic resin stent

A synthetic resin stent comprising:

• a stent main body part formed in a cylindrical shape by fibers made of synthetic resin and being deformable from a state of contracted diameter to a state of expanded diameter;
• and
• a diameter expansion mechanism that is connected to the stent main body part, deforms the stent main body part from the state of contracted diameter to the state of expanded diameter and holds the stent main body part in the state of expanded diameter,
• wherein the diameter expansion mechanism comprises:
• a ring-shaped member attached to a distal end side of the stent main body part;
• a string-shaped member, one end portion of the string-shaped member being connected to a proximal end side of the stent main body part, the string-shaped member being inserted through the ring-shaped member in the state of contracted diameter of the stent main body part, an other end side of the string-shaped member extending to the proximal end side of the stent main body part;
• and
• a locking part disposed at a connecting portion of the string-shaped member and the stent main body part or in a vicinity of the connecting portion and is capable of locking the ring-shaped member;
• wherein in a state of the stent main body part being contracted, upon pulling the string-shaped member toward the proximal end side of the stent main body part, the ring-shaped member and the locking part move in approaching directions, and additionally the ring-shape member and the locking part are engaged with each other to hold the stent main body part in the state of expanded diameter.