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US-12616828-B2 - Detecting heating of implanted coil hermetic package when misaligned

US12616828B2US 12616828 B2US12616828 B2US 12616828B2US-12616828-B2

Abstract

A method of monitoring heating of a hermetic package of an implanted transcutaneous energy transfer system (TETS) coil, the method includes monitoring a power transfer between the implanted TETS coil and an external TETS coil; detecting an amount of power lost during the power transfer; determining if the amount of power lost during the power transfer is above a first predetermined threshold; if the power lost is above the first predetermined threshold, determining if a misalignment between the implanted TETS coil and the external TETS coil is greater than a predetermined distance; and if the misalignment is greater than the predetermined distance, generating an alert to align the external TETS coil with the implanted TETS coil.

Inventors

  • Danielle S. Mathiesen
  • Eric A. SCHILLING
  • David J. Peichel

Assignees

  • BOSTON SCIENTIFIC SCIMED, INC.

Dates

Publication Date
20260505
Application Date
20210922

Claims (19)

  1. 1 . A method of monitoring heating of a hermetic package of an implanted transcutaneous energy transfer system (TETS) coil, comprising: monitoring a power transfer between the implanted TETS coil and an external TETS coil; detecting an amount of power lost during the power transfer that is above a first predetermined threshold; generating an alert and initiating a first predetermined period of time in response to detecting that the amount of power lost is above the first predetermined threshold; monitoring the power transfer during the first predetermined period of time, determining that the power transfer has not improved during the first predetermined period of time; reducing a charging rate of a battery of an internal controller of an implanted blood pump in communication with the implanted TETS coil and initiating a second predetermined period of time in response to determining that the power transfer has not improved during the first predetermined period of time; monitoring the power transfer during the second predetermined period of time; determining that the power transfer has not improved during the second predetermined period of time; and suspending the power transfer between the external TETS coil and the implanted TETS coil based on determining that the power transfer has not improved during the second predetermined period of time.
  2. 2 . The method of claim 1 , wherein the first predetermined threshold is 100 mW to 500 mW.
  3. 3 . The method of claim 1 , wherein the first predetermined period of time is 1 minute to 5 minutes.
  4. 4 . The method of claim 1 , wherein the second predetermined period of time is 2 minutes to 10 minutes.
  5. 5 . The method of claim 1 , wherein the power lost is a function of the implanted TETS coil and the external TETS coil being misaligned.
  6. 6 . The method of claim 1 , wherein the power lost is a function of a presence of foreign metallic object between the implanted TETS coil and the external TEST coil.
  7. 7 . The method of claim 1 , wherein the power lost exceeding the first determined threshold occurs when a misalignment between the implanted TETS coil and the TETS coil is a distance of 3 centimeters or greater.
  8. 8 . The method of claim 1 , wherein the power lost exceeding the first determined threshold occurs when a misalignment between the implanted TETS coil and the TETS coil is a distance of 1 centimeters or greater.
  9. 9 . The method of claim 1 , wherein the first predetermined period of time is 5 minutes, and the second predetermined period of time is 10 minutes.
  10. 10 . The method of claim 1 , wherein the first predetermined threshold is 200-300 mW.
  11. 11 . The method of claim 1 , wherein generating the alert comprises generating a visual, audio, or tactile alert.
  12. 12 . A controller for an implantable blood pump, comprising: processing circuitry configured to: monitor a power transfer between the implanted TETS coil and an external TETS coil; detect an amount of power lost during the power transfer that is above a first predetermined threshold; generate an alert and initiate a first predetermined period of time in response to detection that the amount of power lost is above the first predetermined threshold; monitor the power transfer during the first predetermined period of time; determine that the power transfer has not improved during the first predetermined period of time; reduce a charging rate of a battery of an internal controller of the implantable blood pump in communication with the implanted TETS coil and initiating a second predetermined period of time in response to the determination that the power transfer has not improved during the first predetermined period of time: monitor the power transfer during the second predetermined period of time; determine that the power transfer has not improved during the second predetermined period of time; and suspend the power transfer between the external TETS coil and the implanted TETS coil based on the determination that the power transfer has not improved during the second predetermined period of time.
  13. 13 . The controller of claim 12 , wherein the power lost is a function of the implanted TETS coil and the external TETS coil being misaligned while the power transfer is occurring.
  14. 14 . The controller of claim 12 , wherein the power lost is a function of a presence of foreign metallic object between the implanted TETS coil and the external TEST coil while the power transfer is occurring.
  15. 15 . The controller of claim 12 , wherein the power lost exceeding the first determined threshold occurs when a misalignment between the implanted TETS coil and the TETS coil is a distance of 3 centimeters or greater.
  16. 16 . The controller of claim 12 , wherein the power lost exceeding the first determined threshold occurs when a misalignment between the implanted TETS coil and the TETS coil is a distance of 1 centimeters or greater.
  17. 17 . The controller of claim 12 , wherein the first predetermined period of time is 5 minutes, and the second predetermined period of time is 10 minutes.
  18. 18 . The controller of claim 12 , wherein the first predetermined threshold is 200-300 mW.
  19. 19 . The controller of claim 12 , wherein the processing circuitry is configured to generate the alert as a visual, audio, or tactile alert.

Description

This application is a U.S. National Stage entry under 35 U.S.C. § 371 of International Application No. PCT/US2021/051442, filed Sep. 22, 2021, which claims priority from and the benefit of U.S. Provisional Patent Application No. 63/112,270, filed on Nov. 11, 2020, the entire content of each of which is incorporated herein by reference. FIELD The present technology is generally related to a method and controller for monitoring heating of a hermetic package of an implanted transcutaneous energy transfer system (TETS) coil. BACKGROUND Implanted TETS coils for wireless power transfer including tuning capacitors that are disposed in a hermetic package coupled to the implanted TETS coil. However, if an external coil of the TETS becomes misaligned with the implanted TETS coil, high levels of heating of the hermetic package may exceed thermal requirements. SUMMARY The techniques of this disclosure generally relate to a method and controller for monitoring heating of a hermetic package of an implanted transcutaneous energy transfer system (TETS) coil In one aspect, the present disclosure provides a method of monitoring heating of a hermetic package of an implanted transcutaneous energy transfer system (TETS) coil, the method includes monitoring a power transfer between the implanted TETS coil and an external TETS coil; detecting an amount of power lost during the power transfer; determining if the amount of power lost during the power transfer is above a first predetermined threshold; if the power lost is above the first predetermined threshold, determining if a misalignment between the implanted TETS coil and the external TETS coil is greater than a predetermined distance; and if the misalignment is greater than the predetermined distance, generating an alert to align the external TETS coil with the implanted TETS coil. In another aspect of this embodiment, if the misalignment is less than the predetermined distance, generating an alert to a presence of a foreign object. In another aspect of this embodiment, if following the generating of the alert to align the external TETS coil with the implanted TETS coil the coil misalignment is less than the predetermined distance, the method further includes continuing to monitor the power transfer. In another aspect of this embodiment, if following the generating of the alert to align the external TETS coil with the implanted TETS coil, the coil misalignment is greater than the predetermined distance, the method further includes determining if the misalignment has improved within a first predetermined period of time. In another aspect of this embodiment, the method further includes reducing or stopping charging a battery of an internal controller of an implanted blood pump in communication with the implanted TETS if the misalignment has not improved within the first predetermined period of time. In another aspect of this embodiment, the method further includes generating the alert to align the external TETS coil with the implanted TETS coil following the reducing or stopping the charging of the battery. In another aspect of this embodiment, if following the generating of the alert to align the external TETS coil with the implanted TETS coil the coil misalignment is greater than the predetermined distance, the method further includes determining if the misalignment has improved within a second predetermined period of time greater than the first predetermined period of time and if the amount of power lost is greater than a second predetermined threshold, the method further includes suspending the transfer of power between the external TETS coil and the implanted TETS coil. In another aspect of this embodiment, the predetermined distance is 3 cm. In another aspect of this embodiment, the first predetermined threshold and the second predetermined threshold between is 100-500 mW. In another aspect of this embodiment, the first predetermined period of time is between 1-5 minutes. In another aspect of this embodiment, the second predetermined period of time is between 2-10 minutes. In one aspect, a controller for an implantable blood pump includes processing circuitry configured to monitor a power transfer between the implanted TETS coil and an external TETS coil; detect an amount of power lost during the power transfer; determine if the amount of power lost during the power transfer is above a first predetermined threshold; if the power lost is above the first predetermined threshold, determine if a misalignment between the implanted TETS coil and the external TETS coil is greater than a predetermined distance; and if the misalignment is greater than the predetermined distance, generate an alert to align the external TETS coil with the implanted TETS coil. In another aspect of this embodiment, if the misalignment is less than the predetermined distance, the processing circuitry is further configured to generate an alert to a presence of a foreign object. In another aspect of this