Various operating mechanisms for intraosseous access medical devices and methods thereof

A method of an intraosseous access device, comprising:

• obtaining the intraosseous access device;
• disengaging an interlock mechanism configured to prevent rotation of an intraosseous needle and drilling therewith until the interlock mechanism is disengaged;
• inserting a distal end of the intraosseous needle through skin at an insertion site of a patient;
• applying force to bone at the insertion site with the distal end of the intraosseous needle to activate a pressure-based trigger mechanism and start winding a metal ribbon of a constant-torque spring assembly from an output spool onto a storage spool, thereby starting rotation of the intraosseous needle by way of a drive shaft coupled to the constant-torque spring assembly;
• and
• drilling through the bone until the intraosseous needle enters a medullary cavity of the patient, thereby achieving intraosseous access to the medullary cavity of the patient with the intraosseous access device.