Patent ID: 7172612

Claim:
A trocar system comprising: a trocar needle structured to pierce a body wall; an outer tube including a distal end and a proximal end from which the trocar needle is insertable; a dilator which is interposed between the outer tube and the trocar needle, after being inserted from the proximal end of the outer tube, and has a pierce hole expansion portion that dilates a small-diameter pierce hole made by the trocar needle; a guide member which includes a cylindrical portion which is projected outward from a distal end portion of the dilator, after being inserted from a proximal end portion of the dilator, the guide member including a handle portion which projects from a proximal end of the dilator, with the guide member engaged with the dilator; and an adjusting mechanism for changing an amount of projection of the cylindrical portion by relatively moving the guide member and the dilator according to an operation of the handle portion to change the amount of projection of the cylindrical portion in a state in which the guide member and the dilator are combined.