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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

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Published on: April 4, 2013

Active catheter driven by a thermo-hydraulic actuation.

Yonatan Horovitz, Gabor Kosa

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 7, 2016

Summary

This study introduces a novel thermo-hydraulic actuator for active catheters, overcoming limitations of wire-driven designs. The new tip-mounted actuator achieves significant bending for enhanced maneuverability in medical devices.

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Area of Science:

Medical Devices
Robotics
Materials Science

Background:

Traditional catheters and endoscopes use base-driven mechanical wires, leading to friction and buckling issues.
Placing actuators at the catheter tip enhances maneuverability but faces challenges in achieving sufficient bending.
Existing micro-actuators struggle to provide adequate bending force for active catheter steering.

Purpose of the Study:

To develop and evaluate a novel thermo-hydraulic actuation method for catheter steering.
To overcome the limitations of micro-actuators in generating high bending torque at the catheter tip.
To present the modeling, optimization, design, and testing of an initial prototype active catheter actuator.

Main Methods:

Thermo-hydraulic actuation principle utilizing internal hydraulic pressure for bending torque.
Integration of a thermal micro-actuator within the tube wall to control steering direction.
Modeling, optimization, and experimental testing of a prototype actuator constructed from TPU.

Main Results:

The developed thermo-hydraulic actuator enables tip-based steering for active catheters.
A prototype actuator with a 4 mm outer diameter (OD) made of thermoplastic polyurethane (TPU) was successfully fabricated and tested.
The prototype demonstrated a bending capability of up to ±12 degrees.

Conclusions:

The novel thermo-hydraulic actuation method effectively addresses the challenge of achieving high bending in active catheter tips.
The tested prototype validates the feasibility of this approach for enhancing catheter maneuverability.
This technology holds promise for improving steering capabilities in minimally invasive medical procedures.