Hand-Held Instrument with Integrated Parallel Mechanism for Active Tremor Compensation During Microsurgery

Area of Science:

• Biomedical Engineering
• Robotics
• Surgical Technology

Background:

• Physiological hand tremor is a major limitation in microsurgery, affecting instrument tip positioning accuracy.
• Existing tremor compensation methods often lack the necessary precision or are not integrated into hand-held instruments.

Purpose of the Study:

• To design and evaluate a novel hand-held active tremor compensation instrument for microsurgery.
• To enhance the accuracy and stability of surgical instrument manipulation during delicate procedures.

Main Methods:

• Development of a three degrees of freedom (DOF) integrated parallel manipulator.
• Integration of a high-performance inertial measurement unit (IMU) for sensing instrument tip motion.
• Application of a customized filter to isolate hand tremor frequencies and generate counter-motion.

Main Results:

• Bench tests demonstrated an average Root Mean Square (RMS) tremor reduction ratio of 56.5%.
• Hand-held tests showed an average RMS tremor reduction ratio of 41.0%.
• The instrument achieved a 31.7% RMS reduction in hand tremor magnitudes across 2-DOF.

Conclusions:

• The developed hand-held instrument effectively compensates for physiological hand tremors.
• This technology has the potential to significantly improve precision and safety in microsurgical operations.
• Further research can explore integration into various surgical tools to broaden applicability.