An insertion mechanism for a drug pump (10, 1300), the insertion mechanism comprising: a rotatably disposed housing (202, 1202, 2202, 3202) having an internal chamber; at least one rotational biasing member (210, 1210, 2210, 3210) coupled to the housing (202, 1202, 2202, 3202) and initially held in an energized state, the rotational biasing member (210, 1210, 2210, 3210) being disposed to rotate the housing (202, 1202, 2202, 3202) as the rotational biasing member (210, 1210, 2210, 3210) de-energizes; a sleeve (220, 1220, 2220, 3220) disposed at least partially within the internal chamber of the housing (202, 1202, 2202, 3202), wherein the housing is configured to rotate with respect to the sleeve; a needle (214, 1214, 2214, 3214) having a hollow interior, a proximal end, and a distal end and disposed at least partially within the internal chamber of the housing (202, 1202, 2202, 3202); a hub (212, 1212, 2212, 3212) connected to the proximal end of the needle (214, 1214, 2214, 3214) and disposed at least partially within the internal chamber of the housing (202, 1202, 2202, 3202), the needle (214, 1214, 2214, 3214) and hub (212, 1212, 2212, 3212) being configured to axially translate between an initial position and an insertion position; characterized by at least one retraction biasing member (216, 1216, 2216, 3216) disposed between the hub (212, 1212, 2212, 3212) and at least one axially-stationary element (220, 252, 1220, 1222, 1252, 2220, 2222, 2252, 3220, 2222, 3252), the retraction biasing member (216, 1216, 2216, 3216) being disposed to move the hub (212, 1212, 2212, 3212) and needle (214, 1214, 2214, 3214) from the insertion position to an at least partially retracted position as the retraction biasing member (216, 1216, 2216, 3216) de-energizes; wherein rotation of the housing (202, 1202, 2202, 3202) caused by de-energizing of the rotational biasing member (210, 1210, 2210, 3210) causes axial translation of the hub (212, 1212, 2212, 3212) and needle (214, 1214, 2214, 3214) in a distal direction from the initial position to the insertion position and further wherein de-energizing of the retraction biasing member (216, 1216, 2216, 3216) causes translation of the hub (212, 1212, 2212, 3212) and needle (214, 1214, 2214, 3214) in a proximal direction to the at least partially retracted position. a rotatably disposed housing (202, 1202, 2202, 3202) having an internal chamber; at least one rotational biasing member (210, 1210, 2210, 3210) coupled to the housing (202, 1202, 2202, 3202) and initially held in an energized state, the rotational biasing member (210, 1210, 2210, 3210) being disposed to rotate the housing (202, 1202, 2202, 3202) as the rotational biasing member (210, 1210, 2210, 3210) de-energizes; a sleeve (220, 1220, 2220, 3220) disposed at least partially within the internal chamber of the housing (202, 1202, 2202, 3202), wherein the housing is configured to rotate with respect to the sleeve; a needle (214, 1214, 2214, 3214) having a hollow interior, a proximal end, and a distal end and disposed at least partially within the internal chamber of the housing (202, 1202, 2202, 3202); a hub (212, 1212, 2212, 3212) connected to the proximal end of the needle (214, 1214, 2214, 3214) and disposed at least partially within the internal chamber of the housing (202, 1202, 2202, 3202), the needle (214, 1214, 2214, 3214) and hub (212, 1212, 2212, 3212) being configured to axially translate between an initial position and an insertion position; characterized by at least one retraction biasing member (216, 1216, 2216, 3216) disposed between the hub (212, 1212, 2212, 3212) and at least one axially-stationary element (220, 252, 1220, 1222, 1252, 2220, 2222, 2252, 3220, 2222, 3252), the retraction biasing member (216, 1216, 2216, 3216) being disposed to move the hub (212, 1212, 2212, 3212) and needle (214, 1214, 2214, 3214) from the insertion position to an at least partially retracted position as the retraction biasing member (216, 1216, 2216, 3216) de-energizes; wherein rotation of the housing (202, 1202, 2202, 3202) caused by de-energizing of the rotational biasing member (210, 1210, 2210, 3210) causes axial translation of the hub (212, 1212, 2212, 3212) and needle (214, 1214, 2214, 3214) in a distal direction from the initial position to the insertion position and further wherein de-energizing of the retraction biasing member (216, 1216, 2216, 3216) causes translation of the hub (212, 1212, 2212, 3212) and needle (214, 1214, 2214, 3214) in a proximal direction to the at least partially retracted position.