Components and methods for patient infusion device

A transcutaneous access tool comprising:

• a first cannula moveable along an axis of the transcutaneous access tool;
• a fixed member including an elongated prong extending parallel with the axis;
• a deployment member secured to the first cannula and movable along the axis away from the fixed member, the deployment member including spaced-apart, resiliently flexible fingers extending parallel with the axis and slidingly received on the prong of the fixed member, the fingers having distal ends that are laterally enlarged with respect to the axis;
• a second cannula disposed within the lumen of the first cannula;
• a retraction member secured to the second cannula and movable along the axis between the fixed member and the deployment member, wherein the retraction member includes at least one catch extending laterally inwardly with respect to the axis and catching on the laterally enlarged distal ends of the fingers of the deployment element when the fingers are laterally held apart by the prong of the fixed member;
• and
• a deployment spring biasing the deployment member away from the fixed member;
• and
• a retraction spring biasing the retraction member away from the deployment member and towards the fixed member.