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Development of a high permeability cored transintegumental power transformer
A J Helmicki1, D M Melvin, H T Henderson
1Department of Electrical and Computer Engineering, University of Cincinnati, OH 45221-0030, USA.
ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|September 1, 1996
Summary
This study introduces a novel transenteric implantable transformer for efficient wireless power transmission to circulatory support devices. The new design significantly reduces device size and improves energy efficiency compared to existing transcutaneous methods.
Area of Science:
- Biomedical Engineering
- Implantable Devices
- Power Electronics
Background:
- Circulatory support devices require 10-20 W of power.
- Current transcutaneous power transmission methods utilize air-cored transformers, leading to bulky external components and inefficient energy transfer.
- Significant stray electromagnetic fields from current devices pose risks to surrounding tissues.
Purpose of the Study:
- To engineer and test a novel high-permeability cored transformer for transenteric power transmission.
- To improve energy transmission efficiency, reduce heat dissipation, and minimize stray electromagnetic fields for implantable devices.
- To develop a compact and efficient power and data transfer solution for medical implants.
Main Methods:
- Designed and tested two competing transenteric transformer configurations using isolated intestinal pouches.
- Integrated transformer with DC/DC resonant converter power interface electronics.
- Incorporated data interface electronics for multi-signal communication across the transformer.
Main Results:
- Both designs achieved continuous 25 W power transmission at 12 Vdc into a 5.8 omega load.
- Demonstrated DC to DC efficiencies greater than 75% and coil to coil efficiencies greater than 96%.
- Implantable package size was under 40 ml and weight under 100 g, with favorable short-term implantation results.
Conclusions:
- The novel transenteric transformer design offers a highly efficient and compact solution for powering implantable devices.
- This approach significantly overcomes the limitations of current transcutaneous power transmission technologies.
- Further long-term implantation studies are ongoing to validate the technology for clinical use.