Activation system and method for on-body medical devices

1. 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.

2. The medical device of claim 1 , further comprising a volume containing the medical substance within said housing.

3. The medical device of claim 1 , wherein any one of said first start time, said first stop time, said first duration, said second start time, said second stop time, and said second duration comprises at least one of a preset value stored in a non-transient computer readable memory, a value transmitted to said controller via wired and/or wireless communication, and a selectively determined value based on an intended operation of said medical device.

4. The medical device of claim 1 , wherein said first user accessible button is disposed at a distance with respect to said second user accessible button, whereby actuation of said first user accessible button is independent of actuation of said second user accessible button.

5. The medical device of claim 1 , wherein said housing comprises first and second opposing surfaces and said first user accessible button and said second user accessible button disposed on respective ones of the first and second opposing surfaces.

6. The medical device of claim 1 , wherein said housing comprises a cutout, and at least one button chosen from said first user accessible button and said second user accessible button and comprises a portion thereof that extends through the cutout and into said housing,

wherein the housing encloses a switch and the portion of the button activates the switch when manipulated by a user, the switch being inactive when the button is not manipulated by a user.

7. The medical device of claim 1 , wherein said first time trace and said second time trace are configured to be processed independently and in parallel with each other.

8. The medical device of claim 1 , wherein said comparison between said first and second time traces comprises time overlap of said first and second time traces with respect to each other.

9. The medical device of claim 8 , wherein duration of the time overlap is based on a number of factors chosen from locations of a first button and a second button corresponding to said first user input and said second user input respectively on the medical device, human factor considerations related to user manipulation of the first button and the second button, bounce associated with contacts of switches in the first button and the second button, and tactile feedback qualities of the first button and the second button.

10. The medical device of claim 9 , 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 a predetermined amount of the medical substance.

11. The medical device of claim 1 , wherein said interface comprises a first switch and a second switch, and said controller is configured to initiate a first timer in response to an activation signal from the first switch, and to initiate a second timer in response to an activation signal from the second switch.

12. The medical device of claim 11 , wherein, when only one of said first timer and said second timer is initiated by said controller, said controller registers said first user input and said second user input as an invalid activation and does not command infusing of the medical substance.

13. The medical device of claim 11 , wherein the first timer and the second timer are set for respective predetermined amounts of time that can be different or same durations with respect to one another, said first and second time traces corresponding to the durations of the first timer and the second timer, respectively.

14. The medical device of claim 13 , wherein said controller is configured to determine when the duration of the first timer and the duration of the second timer overlap, said comparison between said time traces corresponding to the overlap.