Improvement in magnetic field immunity of externally-coupled transcutaneous energy transmission system for a totally implantable artificial heart.

Journal of artificial organs : the official journal of the Japanese Society for Artificial Organs · 2008 · Mixed · Insufficient evidence

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MixedInsufficient evidencePaper 2820

Study snapshot

PublicationJournal of artificial organs : the official journal of the Japanese Society for Artificial Organs · 2008

Study typeengineering

Reported directionMixed

Evidence ratingInsufficient

Abstract

Transcutaneous energy transmission (TET) that uses electromagnetic induction between the external and internal coils of a transformer is the most promising method to supply driving energy to a totally implantable artificial heart without invasion. Induction-heating (IH) cookers generate magnetic flux, and if a cooker is operated near a transcutaneous transformer, the magnetic flux generated will link with the external and internal coils of the transcutaneous transformer. This will affect the performance of the TET and the artificial heart system. Hence, it is necessary to improve the magnetic field immunity of the TET system. During operation of the system, if the transcutaneous transformer is in close proximity to an IH cooker, the electric power generated by the cooker and coupled to the transformer can drive the artificial heart system. To prevent this coupling, the external coil was shielded with a conductive shield that had a slit in it. This reduces the coupling between the transformer and the magnetic field generated by the induction cooker. However, the temperature of the shield increased due to heating by eddy currents. The temperature of the shield can be reduced by separating the IH cooker and the shield.

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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 directionmixed

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Magnetic flux from an induction-heating cooker can couple to the external/internal coils of a transcutaneous transformer and can generate power sufficient to drive the artificial heart system when in close proximity. Shielding the external coil with a conductive shield containing a slit reduced coupling to the cooker’s magnetic field, but the shield temperature increased due to eddy-current heating; increasing separation between the cooker and shield reduced shield temperature.

Outcomes measured

Magnetic field coupling/interference with transcutaneous energy transmission (TET) system
Performance/operation of TET and artificial heart system near IH cooker
Shield temperature increase due to eddy-current heating

Limitations

No quantitative exposure parameters (e.g., frequency, field strength) reported in abstract
No sample size or experimental setup details provided in abstract
Focus is on device interference/engineering performance rather than biological/health outcomes

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "induction-heating (IH) cooker",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Magnetic field coupling/interference with transcutaneous energy transmission (TET) system",
    "Performance/operation of TET and artificial heart system near IH cooker",
    "Shield temperature increase due to eddy-current heating"
  ],
  "main_findings": "Magnetic flux from an induction-heating cooker can couple to the external/internal coils of a transcutaneous transformer and can generate power sufficient to drive the artificial heart system when in close proximity. Shielding the external coil with a conductive shield containing a slit reduced coupling to the cooker’s magnetic field, but the shield temperature increased due to eddy-current heating; increasing separation between the cooker and shield reduced shield temperature.",
  "effect_direction": "mixed",
  "limitations": [
    "No quantitative exposure parameters (e.g., frequency, field strength) reported in abstract",
    "No sample size or experimental setup details provided in abstract",
    "Focus is on device interference/engineering performance rather than biological/health outcomes"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "transcutaneous energy transmission",
    "electromagnetic induction",
    "magnetic field immunity",
    "induction-heating cooker",
    "shielding",
    "eddy currents",
    "implantable artificial heart",
    "transformer coupling"
  ],
  "suggested_hubs": [
    {
      "slug": "engineering",
      "weight": 0.9,
      "reason": "Study concerns electromagnetic interference and shielding design for an implantable artificial heart power transmission system."
    },
    {
      "slug": "occupational-exposure",
      "weight": 0.15,
      "reason": "Mentions exposure to magnetic fields from induction-heating cookers, though not in an occupational study context."
    }
  ]
}

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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: 10.1007/s10047-008-0435-2
PubMed: 19184291

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