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Design for a constant peak current defibrillator.

J W Machin1, J Brownhill, A Furness

  • 1Department of Electrical and Electronic Engineering, Staffordshire Polytechnic, England.

IEEE Transactions on Bio-Medical Engineering
|July 1, 1990
PubMed
Summary
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A novel damped sine wave defibrillator can maintain constant peak discharge current across varying patient thoracic impedance. This is achieved by dumping excess stored energy, ensuring consistent current delivery for improved defibrillation efficacy.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Electrical Engineering

Background:

  • Conventional defibrillators struggle to maintain consistent current delivery due to variations in patient thoracic impedance.
  • Optimizing defibrillator performance requires stable current output irrespective of patient factors.

Purpose of the Study:

  • To investigate the theoretical and practical feasibility of a damped sine wave defibrillator capable of constant peak discharge current.
  • To develop a defibrillator that compensates for a wide range of patient thoracic impedance.

Main Methods:

  • Theoretical modeling of a damped sine wave defibrillator circuit.
  • Implementation using excess energy storage and a current-triggered charge dumping mechanism.
  • Incorporation of a larger-than-normal inductance to stabilize current and waveform.

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Main Results:

  • Demonstrated theoretical possibility of constant peak discharge current over a broad impedance range.
  • Practical realization achieved with +/- 6% variation for 95% of a normal patient population.
  • Simulated energy expenditure was lower compared to conventional defibrillators.

Conclusions:

  • The proposed damped sine wave defibrillator design effectively overcomes limitations of varying patient impedance.
  • This technology offers a more reliable and potentially more energy-efficient defibrillation method.