A device (10, 210, 410) comprising: a housing (20, 220, 420) having a proximal portion (21, 421) and a distal portion (22, 422); a magnetic field generator (30, 230) contained within the distal portion (22, 422) of the housing (20, 220, 420) to produce a magnetic field; a tissue penetrating subassembly (60, 260, 440) including a hub (70, 270, 450) and a tissue penetrating medical device (80, 460) having a proximal end (81, 221, 262, 461) and a distal end (82, 222, 266, 462); the hub (70, 270, 450) detachably connected to the distal portion (22, 421) of the housing (20, 220, 420); and the proximal end (81, 221, 262, 461) of tissue penetrating medical device (80, 460) extending proximally from the hub (70, 270, 450) such that the proximal end (81, 221, 262, 461) of the tissue penetrating medical device (80, 460) is exposed to the magnetic field and the distal end (82, 222, 266, 462) of the tissue penetrating medical device (80, 460) is magnetized upon exposure of the proximal end (81, 221, 262, 461) of the tissue penetrating medical device (80, 460) by the magnetic field; and a controller, characterized in that the magnetic field generator (30, 230) includes a coil electrically energized by the magnetic field generator (30, 230) to produce a magnetic field a controller (90, 290) being disposed in the housing (20, 220, 420) and in communication with the magnetic field generator (30, 230), and the controller (90, 290) having a printed circuit assembly that supplies and regulates power to the coil to generate a constant or variable magnetic field around the proximal end (81, 221, 262,461) of the tissue penetrating medical device (80, 460), said housing further comprises a power supply (40, 240, 400) in electrical communication with the magnetic field generator (30, 230). a housing (20, 220, 420) having a proximal portion (21, 421) and a distal portion (22, 422); a magnetic field generator (30, 230) contained within the distal portion (22, 422) of the housing (20, 220, 420) to produce a magnetic field; a tissue penetrating subassembly (60, 260, 440) including a hub (70, 270, 450) and a tissue penetrating medical device (80, 460) having a proximal end (81, 221, 262, 461) and a distal end (82, 222, 266, 462); the hub (70, 270, 450) detachably connected to the distal portion (22, 421) of the housing (20, 220, 420); and the proximal end (81, 221, 262, 461) of tissue penetrating medical device (80, 460) extending proximally from the hub (70, 270, 450) such that the proximal end (81, 221, 262, 461) of the tissue penetrating medical device (80, 460) is exposed to the magnetic field and the distal end (82, 222, 266, 462) of the tissue penetrating medical device (80, 460) is magnetized upon exposure of the proximal end (81, 221, 262, 461) of the tissue penetrating medical device (80, 460) by the magnetic field; and a controller, characterized in that the magnetic field generator (30, 230) includes a coil electrically energized by the magnetic field generator (30, 230) to produce a magnetic field a controller (90, 290) being disposed in the housing (20, 220, 420) and in communication with the magnetic field generator (30, 230), and the controller (90, 290) having a printed circuit assembly that supplies and regulates power to the coil to generate a constant or variable magnetic field around the proximal end (81, 221, 262,461) of the tissue penetrating medical device (80, 460), said housing further comprises a power supply (40, 240, 400) in electrical communication with the magnetic field generator (30, 230).