Analytical Modeling of a New Compliant Microsystem for Atherectomy Operations.

Area of Science:

• Biomedical Engineering
• Mechanical Engineering
• Nanotechnology

Background:

• Atherectomy procedures require advanced tools to minimize patient risks.
• Current devices have limitations in treating narrow lumens.
• Minimally invasive surgical tools need precise control and scalability.

Purpose of the Study:

• To develop a novel, scalable microsystem for atherectomy.
• To enhance patient safety and broaden clinical applicability.
• To create a tool capable of operating in lumens as small as a few tenths of a millimeter.

Main Methods:

• Kinematic synthesis using a Stephenson's kinematic chain (KC) to create a pseudo-rigid body mechanism (PRBM).
• Application of the joint replacement method to derive an equivalent compliant mechanism.
• Analytical modeling and Finite Element Analysis (FEA) for verification.
• Development of a closed-form expression for mechanical advantage (MA) considering elastic energy.

Main Results:

• A new multi-loop mechanism was identified and adapted for the microsystem.
• An equivalent compliant mechanism with lumped compliance was successfully designed.
• The analytical model's results were validated against FEA.
• A novel method for calculating mechanical advantage was established.

Conclusions:

• The developed microsystem offers a promising alternative for atherectomy.
• The design allows for significant size reduction, enabling treatment of very narrow lumens.
• Fabrication is feasible using Microelectromechanical Systems (MEMS) technology.
• Microsystem packaging presents an avenue for future research.