An implantable medical device configured to be implanted within a patient, the IMD comprising: a housing (342, 502) configured for trans-catheter deployment, wherein the housing is substantially transparent to radiative electromagnetic energy and optionally includes a ceramic housing, a glass housing, or a polymeric housing, wherein substantially transparent to radiative electromagnetic energy is defined as allowing at least 70 % of incident energy at a particular wavelength or range of wavelengths to pass through the material without being absorbed by material or blocked by material; a plurality of electrodes (324, 326) exposed external to the housing (342, 502); therapeutic circuitry disposed within the housing (342, 502), the therapeutic circuitry operatively coupled to the plurality of electrodes (324, 326) and configured to sense one or more signals via one or more of the plurality of electrodes (324, 326) and/or to stimulate tissue via one or more of the plurality of electrodes (324, 326); a rechargeable power source disposed within the housing (342, 502) and configured to power the therapeutic circuitry; a receiving antenna disposed within the housing (342, 502) and configured to receive transmitted radiative electromagnetic energy through the patient's body, wherein the receiving antenna comprises a first metal pattern formed on an outer surface of a sleeve insert and a second metal pattern formed on an inner surface of the sleeve insert, and the sleeve insert is configured to be inserted into an elongated cavity of the housing (342, 502) of the IMD; and charging circuitry operably coupled with the receiving antenna and the rechargeable power source, the charging circuitry configured to use the radiative electromagnetic energy received via the receiving antenna to charge the rechargeable power source. a housing (342, 502) configured for trans-catheter deployment, wherein the housing is substantially transparent to radiative electromagnetic energy and optionally includes a ceramic housing, a glass housing, or a polymeric housing, wherein substantially transparent to radiative electromagnetic energy is defined as allowing at least 70 % of incident energy at a particular wavelength or range of wavelengths to pass through the material without being absorbed by material or blocked by material; a plurality of electrodes (324, 326) exposed external to the housing (342, 502); therapeutic circuitry disposed within the housing (342, 502), the therapeutic circuitry operatively coupled to the plurality of electrodes (324, 326) and configured to sense one or more signals via one or more of the plurality of electrodes (324, 326) and/or to stimulate tissue via one or more of the plurality of electrodes (324, 326); a rechargeable power source disposed within the housing (342, 502) and configured to power the therapeutic circuitry; a receiving antenna disposed within the housing (342, 502) and configured to receive transmitted radiative electromagnetic energy through the patient's body, wherein the receiving antenna comprises a first metal pattern formed on an outer surface of a sleeve insert and a second metal pattern formed on an inner surface of the sleeve insert, and the sleeve insert is configured to be inserted into an elongated cavity of the housing (342, 502) of the IMD; and charging circuitry operably coupled with the receiving antenna and the rechargeable power source, the charging circuitry configured to use the radiative electromagnetic energy received via the receiving antenna to charge the rechargeable power source.