Activation system and method for on-body medical devices

A medical device for infusing a medical substance comprising:

• an interface for initiating a first time trace based on a first user input and a second time trace based on a second user input, the first time trace and the second time trace being independent time traces based on said first user input and said second user input;
• and
• a controller for evaluating said first and second time traces to command infusing of the medical substance based on a comparison between said first time trace and said second time trace;
• and
• a housing configured to accommodate said controller, a first user accessible button and a second user accessible button;
• wherein said interface comprises a first user accessible activation control for receiving said first user input and a second user accessible activation control for receiving said second user input, said interface being configured to selectively initiate said first time trace based on said first activation control receiving said first user input, said interface being configured to selectively initiate said second time trace based on said second activation control receiving said second user input, said first user accessible activation control comprises said first user accessible button, and said second user accessible activation control comprises said second user accessible button;
• wherein said first time trace comprises a first start time, a first stop time, and a first duration, said second time trace comprises a second start time, a second stop time, and a second duration, and said comparison depends on at least one of said first start time, said first stop time, said first duration, coinciding with at least one of said second start time, said second stop time, and said second duration;
• and
• wherein, when said controller determines said comparison between said first time trace and said second time trace indicates a valid bolus activation using said first user input and said second user input, said controller initiates a bolus infusion comprising an amount of the medical substance that is independent of said first duration and said second duration.