Implantable medical device with deployable fixation tines

A leadless pacemaker configured to be implanted within a patient, the leadless pacemaker comprising:

• a housing including a distal tip that has a distal face;
• a tip electrode mounted to the distal tip of the housing, the tip electrode centered and exposed along the distal face;
• a plurality of fixation tines mounted to the distal tip of the housing and comprising hook features for securing to tissue of the patient;
• a pulse generator configured to generate electrical stimulation that is delivered, via the tip electrode, to the tissue of the patient;
• and
• a deployment mechanism configured to selectively deploy the fixation tines to a deployed state, wherein the fixation tines in the deployed state are exposed along the distal face and surround the tip electrode, the fixation tines in the deployed state configured to embed into the tissue of the patient to secure the leadless pacemaker at a target implant location.

An implantable medical device (IMD) configured to be implanted within a patient, the IMD comprising:

• a housing including a distal tip that has a distal face;
• a tip electrode mounted to the distal tip of the housing and exposed along the distal face;
• a plurality of fixation tines mounted to the distal tip of the housing and comprising hook features for securing to tissue of the patient;
• and
• a deployment mechanism configured to selectively move the fixation tines in a distal direction relative to the distal tip of the housing from a non-deployed state to a deployed state,
• wherein the fixation tines in the deployed state project beyond the distal face so that the hook features are exposed for embedding into the tissue of the patient to secure the IMD to the tissue, and the hook features of the fixation tines in the non-deployed state do not project beyond the distal face.