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  3. The Magnet-actuated Craniofacial (mac) Distraction System: Magnetic Coupling Modeling.
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  3. The Magnet-actuated Craniofacial (mac) Distraction System: Magnetic Coupling Modeling.

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The Magnet-Actuated Craniofacial (MAC) Distraction System: Magnetic Coupling Modeling.

Mohammed A Fouda1, David Dostal2, Caitlin E Hoffman3

  • 1Department of Neurological Surgery, New York-Presbyterian Hospital, Weill Cornell Medicine, 525 E 68thSt, New York, NY, 10065, USA. Maf4023@med.cornell.edu.

Annals of Biomedical Engineering
|June 26, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

A novel Magnet-Actuated Craniofacial (MAC) distraction system offers a fully-internalized solution for craniofacial abnormalities. This innovative design overcomes limitations of external ports, improving patient outcomes and reducing complications in distraction osteogenesis.

Keywords:
Craniofacial abnormalitiesCraniosynostosisDistraction osteogenesisMACMagnetic actuation

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Area of Science:

  • Biomedical Engineering
  • Craniofacial Surgery
  • Medical Device Design

Background:

  • Craniofacial distraction osteogenesis (DO) effectively treats craniofacial abnormalities but current systems have external ports increasing infection and failure risks.
  • External ports in DO systems pose sociopsychological burdens and risks of premature device removal.
  • The Magnet-Actuated Craniofacial (MAC) distraction system is a fully-internalized alternative to eliminate external ports.

Purpose of the Study:

  • To optimize the magnetic coupling efficiency of the novel Magnet-Actuated Craniofacial (MAC) distraction system.
  • To evaluate different magnetic coupling configurations for transdermal torque transmission.
  • To assess the performance of the MAC system across variable separation distances.

Main Methods:

  • A 3D magnetostatic finite element modeling (FEM) framework was employed for optimization.
  • Compared traditional coaxial dipole coupling with a U-shaped, flux-guided magnetic circuit.
  • Parametric analyses quantified torque-angle behavior, torsional stiffness, and axial forces up to 11.5 mm separation.

Main Results:

  • Coaxial dipole configuration showed significant torque and force decay with increased separation.
  • The U-shaped, flux-guided architecture demonstrated a six-fold increase in peak torque and five-fold improvement in torsional stiffness.
  • Clinically relevant torque and forces were maintained at larger separation distances with the U-shaped design.

Conclusions:

  • Magnetic actuation limitations are design-dependent, not inherent.
  • Flux-guided magnetic circuit engineering enables robust, precise, and predictable transdermal torque transmission.
  • The MAC system's design supports the feasibility of fully-internalized, magnetically-actuated craniofacial distraction.