Medical Wireless Charging Device With Ferrite Stack Centered And Directly Contacted To A Charging Coil

A wireless charger for an implantable medical device (IMD), the wireless charger comprising:

• a) a housing forming an internal compartment;
• b) a printed circuit board (PCB) assembly disposed in the internal compartment of the housing, wherein the PCB assembly comprises at least one electronic component that is configured to control the various functions of the wireless charger;
• c) a rechargeable battery disposed in the internal compartment of the housing, wherein the rechargeable battery is connected to the PCB assembly to power the at least one electronic component;
• d) a wound charging coil disposed in the internal compartment of the housing and being configured to output inductive power, wherein the charging coil is wound in a co-axial relationship around a longitudinal axis and extends to an outer coil edge providing the charging coil with a charging coil diameter;
• and
• e) a stack comprising at least two ferrite sheets disposed in the internal compartment of the housing, wherein the stack of ferrite sheets is directly adhered to the charging coil,
• f) wherein the stack of ferrite sheets is centered along the longitudinal axis between the rechargeable battery and the charging coil.

A wireless charger for an implantable medical device (IMD), the wireless charger comprising:

• a) a housing forming an internal compartment;
• b) a printed circuit board (PCB) assembly disposed in the internal compartment of the housing, wherein the PCB assembly comprises at least one electronic component that is configured to control the various functions of the wireless charger;
• c) a battery disposed in the internal compartment of the housing, wherein the battery is connected to the PCB assembly to power the at least one electronic component;
• d) a wound charging coil disposed in the internal compartment of the housing and being configured to output inductive power, wherein the charging coil has a donut-shape wound around a longitudinal axis and extends to an outer coil edge providing the charging coil with a charging coil diameter, wherein the donut-shaped charging coil has a central opening;
• and
• e) a stack comprising at least two ferrite sheets disposed in the internal compartment of the housing, wherein the stack of ferrite sheets resides in the central opening of the donut-shaped charging coil so that the stack of ferrite sheets does not contact to the charging coil.