Abstract: A trocar obturator having a removable replaceable tip includes an obturator tip having a sharpened distal end and a first engagement device on its proximal end; an obturator shaft having a second engagement device on its distal end for lockingly engaging the first engagement device and securing the tip and shaft together; one of the engagement devices borne by one of the tips and shafts includes a flexible member biased to engage the engagement devices; there are access means for flexing the flexible member against its bias to disengage the engagement devices to release the tip and shaft.