Wireless tissue electrostimulation

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

• a housing configured for trans-catheter deployment;
• a plurality of electrodes exposed external to the housing;
• circuitry disposed within the housing, the circuitry operatively coupled to the plurality of electrodes;
• rechargeable power source disposed within the housing and configured to power the circuitry;
• an expandable antenna configured to receive electromagnetic energy through the patient's body, the expandable antenna including an inductive wire loop and a separate mechanical support supporting the inductive wire loop inductive wire loop with the coiled around the mechanical support, the expandable antenna having a collapsed configuration for use during trans-catheter deployment and an expanded configuration for use after trans-catheter deployment;
• and
• charging circuitry operatively coupled with the expandable antenna and the rechargeable power source, the charging circuitry configured to use the electromagnetic energy received via the expandable antenna to charge the rechargeable power source.

A method for deploying an implantable medical device (IMD), comprising:

• with an expandable loop antenna of the IMD in a collapsed configuration, delivering the IMD to a desired implant location within a chamber of a patient's heart;
• once delivered to the desired implant location, expanding the loop antenna of the IMD to an expanded configuration with the loop antenna disposed within the chamber of the patient's heart;
• fixing the IMD to tissue at the desired implant location;
• and
• wherein after fixing the IMD to tissue at the desired implant site, the loop antenna of the IMD remains in the expanded configuration inside of the chamber of the patient's heart and does not penetrate into the heart wall.