An Out-of-Phase Wireless Power Transfer System for Implantable Medical Devices to Reduce Human Exposure to Electromagnetic Field and Increase Power Transfer Efficiency.

IEEE transactions on biomedical circuits and systems · 2022 · Benefit · Low evidence

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BenefitLow evidencePaper 5721

Study snapshot

PublicationIEEE transactions on biomedical circuits and systems · 2022

Study typeengineering

Reported directionBenefit

Evidence ratingLow

Abstract

For the wireless power transfer (WPT) system in implantable medical devices (IMDs), human tissue is positioned between the transmitting and receiving coils which are different from general WPT systems. Because this space is where the strongest electromagnetic field (EMF) occurs, it is essential to reduce the EMF at the interspace to reduce human exposure to the EMF. In this paper, an out-of-phase coupled WPT system for IMDs is proposed to reduce human exposure to EMF. Considering the EMF exposure and power transfer efficiency (PTE) of the proposed system, a design procedure for determining the phase difference of each capacitor is analyzed and presented. Based on the equivalent circuit model analysis of the proposed system, the EMF and PTE characteristics of the WPT system depending on the design variables are comprehensively analyzed. The proposed system is compared with conventional systems through simulation and measurements. It is verified that the proposed system can reduce the EMF by 41.05% and increase the PTE by 9.62% compared to the conventional system. In addition, through simulation, human exposure to EMFs is assessed considering the exposure environment and electrical properties of human tissues. As a result, the current density, induced electric field, and specific absorption rate were reduced by 44.10%, 38.90%, and 63.82%, respectively.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

An out-of-phase coupled wireless power transfer system for implantable medical devices was proposed and evaluated via simulation and measurements. Compared with conventional systems, the proposed system reduced EMF by 41.05% and increased power transfer efficiency by 9.62%; simulations assessing exposure in human tissues reported reductions in current density (44.10%), induced electric field (38.90%), and SAR (63.82%).

Outcomes measured

Electromagnetic field (EMF) level reduction
Power transfer efficiency (PTE)
Current density
Induced electric field
Specific absorption rate (SAR)

Limitations

Frequency and detailed exposure parameters were not reported in the abstract.
Human exposure assessment appears to be simulation-based; details of models/assumptions are not provided in the abstract.
Sample size and measurement setup details are not provided in the abstract.

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "wireless power transfer system for implantable medical devices",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Electromagnetic field (EMF) level reduction",
    "Power transfer efficiency (PTE)",
    "Current density",
    "Induced electric field",
    "Specific absorption rate (SAR)"
  ],
  "main_findings": "An out-of-phase coupled wireless power transfer system for implantable medical devices was proposed and evaluated via simulation and measurements. Compared with conventional systems, the proposed system reduced EMF by 41.05% and increased power transfer efficiency by 9.62%; simulations assessing exposure in human tissues reported reductions in current density (44.10%), induced electric field (38.90%), and SAR (63.82%).",
  "effect_direction": "benefit",
  "limitations": [
    "Frequency and detailed exposure parameters were not reported in the abstract.",
    "Human exposure assessment appears to be simulation-based; details of models/assumptions are not provided in the abstract.",
    "Sample size and measurement setup details are not provided in the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "wireless power transfer",
    "implantable medical devices",
    "out-of-phase coupling",
    "electromagnetic field exposure",
    "power transfer efficiency",
    "current density",
    "induced electric field",
    "specific absorption rate"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1109/tbcas.2022.3222011
PubMed: 36395127

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