Bio-electrical sensing in an autoinjector

A method of collecting electrical signals of a heart or body of a user with an autoinjector medical device, the method comprising:

• grasping a handle of the autoinjector medical device with a hand on a first side of a user's body, wherein during the grasping a second sensor electrode of the autoinjector medical device directly contacts the hand of the user;
• pressing an engaging surface of the autoinjector medical device directly against a portion of the user's body on a second side of the user's body, wherein during the pressing a first sensor electrode of the autoinjector medical device directly contacts the portion of the second side of the user's body;
• and
• measuring and collecting, by the first sensor electrode and the second sensor electrode, electrical signals produced by the heart or body of the user.

An autoinjector medical device comprising:

• a cover including:
• an engaging surface including a needle outlet;
• and
• a handle formed in the cover at an opposite end of the cover as the engaging surface;
• a needle configured to translate through the needle outlet;
• a first sensor electrode disposed on the engaging surface and adjacent the needle outlet;
• and
• a second sensor electrode disposed on the engaging surface and adjacent the needle outlet, wherein the first sensor electrode and the second sensor electrode are adapted to measure a bio-electrical impedance of a body of a user.