Unlock instant, AI-driven research and patent intelligence for your innovation.

A self-tuning external device for wirelessly recharging implantable medical devices

A technology of external equipment and medical equipment, applied in the field of external equipment

Active Publication Date: 2014-10-22
MEDTRONIC INC
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments solve problems such as these and others by providing an external device with self-tuning capability to the drive circuit
This self-tuning capability allows the drive circuit to be tuned to its resonant frequency during each cycle to approach unity power factor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A self-tuning external device for wirelessly recharging implantable medical devices
  • A self-tuning external device for wirelessly recharging implantable medical devices
  • A self-tuning external device for wirelessly recharging implantable medical devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The embodiment provides an external device that emits recharging energy to the implantable medical device and self-tunes the operation of the driver of the energy storage circuit to maintain approximately unity power factor. The external device can monitor the change in the direction of natural current flow in the energy storage circuit used to emit recharge energy, and can tune the driver of the energy storage circuit in each cycle. In addition, the external device can monitor and control the power provided to the tank circuit with approximately unit power factor to specify the amount of recharging power provided to the implantable medical device. Approximate unit power factor obtains a phase angle of 10° or less between the voltage and current of the tank circuit.

[0018] figure 1 The operating environment 100 of some embodiments of the external device 106 is shown. The implantable medical device 102 appears within the patient's body 116. The implantable medical devic...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

External device circuitry self-tunes so that current is being driven through a coil at a resonant frequency of the tank circuit including the coil. The self-tuning nature of the driver circuitry enables adaptation within a cycle to changes in the resonant frequency such as those due to changing loads on the coil from environmental factors. The self-tuning circuitry monitors the direction of current flow in the tank circuit so that during a non-driven phase of a two-phase cycle, the circuitry detects the current naturally changing directions and then activates the driver circuitry to drive current into the tank circuit in phase with the natural direction of current flow. Unity power factor is approximated while driving the coil despite changes in resonance. Power being driven into the tank circuit may then be measured at the approximation of unity power factor to control the amount of power being applied.

Description

Technical field [0001] An embodiment relates to an external device for wirelessly recharging an implantable medical device through inductive coupling. More specifically, various embodiments relate to external devices that self-tune to account for changes in resonance frequency. Background technique [0002] External devices that provide wireless recharging for implantable medical devices are affected by various environmental conditions. For example, the user may change the location of the external device and / or may change the location of other nearby external objects. This change in environmental conditions—especially changes in orientation or proximity to large metal objects—results in a change in the load of the coil used by the external device to emit recharging energy. When a large metal object appears very close to an external device, the load may be greatly affected by the movement of the external device and / or the large metal object. [0003] It is desirable to maintain a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): A61N1/378
CPCH02J7/00A61N1/3787H02J7/00034H02J50/80H02J50/12H02J2310/23
Inventor D·A·丁斯莫尔
Owner MEDTRONIC INC