Patent ID: 7740613

Claim:
An inserter for automatically inserting a cannula of an indwelling member of an infusion device into a body of a user, comprising: a tubular housing; a first member contained in said housing in a state where said first member is movable in an axial direction and holding said indwelling member; a second member provided on a side opposite to a body surface of said user with respect to said first member, contained in said housing in a state where said second member is relatively movable in the axial direction relative to said first member, and having a first latch portion that can be latched by said housing; a third member contained in said housing and having a second latch portion that can be latched by said first member and said second member; an insertion needle held by said third member and inserted in said cannula; and a biasing member provided between said first member and said second member and applying a biasing force in a direction of biasing said first member and said second member away from each other, wherein before said indwelling member reaches the body surface of said user, said first latch portion of said second member is latched by said housing and said second latch portion of said third member is latched by said first member, a latch release portion is provided that releases latching of said first latch portion of said second member by said housing when said indwelling member reaches the body surface of said user, and a latch switch portion is provided that releases latching of said second latch portion of said third member by said first member when said indwelling member reaches the body surface of said user and causes said second latch portion of said third member to be latched by said second member.