Inductively rechargeable external energy source, charger, system and method for a transcutaneous inductive charger for an implantable medical device

Patent metadata

Field	Value
Publication number	US-11318250-B2
Application number	US-201916450399-A
Country	US
Kind code	B2
Filing date	Jun 24, 2019
Priority date	Oct 2, 2003
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A mechanism for transferring energy from an external power source to an implantable medical device is disclosed. A sensor may be used to measure a parameter that correlates to a temperature of the system that occurs during the transcutaneous coupling of energy. For example, the sensor may measure temperature of a surface of an antenna of the external power source. The measured parameter may then be compared to a programmable limit. A control circuit such as may be provided by the external power source may then control the temperature based on the comparison. The programmable limit may be, for example, under software control so that the temperature occurring during transcutaneous coupling of energy may be modified to fit then-current circumstances.

First claim

What is claimed is:

1. A rechargeable medical implant system for a patient comprising:
an implantable medical device adapted for implantation in the patient having a rechargeable power source for powering the implantable medical device while implanted within the patient and a wireless power receiving unit coupled with the rechargeable power source;
a portable charging device having a wireless power transmitting unit configured to magnetically couple with the wireless power receiving unit of the implantable medical device to recharge the rechargeable power source,
wherein the wireless power transmitting unit is configured for magnetically coupling with the wireless power receiving unit when a surface of the portable charging device at least partially engages the skin surface of the patient and is positioned at least partially over the implantable medical device,
wherein at least a portion of the surface of the portable charging device includes a thermally conductive material,
wherein the portable charging device transfers power to the wireless power transmitting unit from a charging unit having a rechargeable battery, the charging unit including a measurement circuit to measure a measured current from the rechargeable battery,
wherein a temperature sensor is positioned within the portable charging device and in direct thermal contact with the thermally conductive material; and
wherein the wireless power transmitting unit includes a control circuitry adapted to control the transfer of energy to the implantable medical device based on the output of the temperature sensor to limit a temperature of the thermally conductive material to which a patient is exposed during the transfer of energy to the implantable medical device, and further based on the measured current of the rechargeable battery;

a carrier configured to be selectively attachable to the patient and removably coupleable with the charging device,
wherein the carrier includes a frame having an opening through which a portion of the portable charging device extends when the portable charging device is coupled with the frame.

2. The rechargeable medical implant system of claim 1 , wherein the carrier includes an adhesive surface for adhering to a skin surface of the patient, and wherein the adhesive surface is not in contact with a surface of the portable charging device, and wherein the adhesive surface includes a biocompatible adhesive with sufficient adhesive strength to adhere to the patient's skin surface and support the carrier coupled with the portable charging device for at least a duration of time sufficient to recharge the implanted medical device.

3. The rechargeable medical implant system of claim 1 , wherein the portable recharging device and the carrier are configured to allow manual rotation of at least a portion of the portable charging device relative to the carrier while the portable charging device is releasably coupled with the carrier to facilitate optimization of the transfer of energy based on an alignment of the portable recharging device and the implantable medical device.

4. The rechargeable medical implant system of claim 1 , wherein the wireless power transmitting unit include a primary charging coil and the wireless power receiving unit includes a secondary charging coil, and where a drive frequency of the wireless charging unit is varied, both during commencement of energy transfer to the wireless receiving unit and periodically during energy transfer to the wireless receiving unit.

Assignees

• Medtronic Inc

Inventors

• Olson David P
• Phillips William C
• Schmeling Andrew L

Classifications

• H02J7/975

  in response to temperature · CPC title

• A61N1/3787 Primary

  from an external energy source · CPC title

• A61M5/14276 Primary

  specially adapted for implantation · CPC title

• A61M2205/3327

  Measuring · CPC title

• A61M2205/8237

  Charging means · CPC title