A remote palpation instrument for laparoscopic surgery: design and performance

Area of Science:

• Robotics and Control Systems
• Surgical Technology
• Human-Computer Interaction

Background:

• Laparoscopic surgery often lacks tactile feedback, limiting surgeons' ability to assess tissue properties.
• Existing laparoscopic instruments provide limited sensory information, potentially impacting surgical precision.

Purpose of the Study:

• To design and evaluate a prototype remote palpation instrument with tactile feedback for laparoscopic surgery.
• To compare surgical palpation performance with and without the developed tactile feedback system.

Main Methods:

• Developed a compact tactile sensor and display integrated into a laparoscopic grasper.
• Conducted static and dynamic performance tests of the instrument.
• Performed psychophysical experiments with human subjects to assess hardness and size discrimination.

Main Results:

• The tactile display successfully rendered object hardness, size, and shape in static tests.
• Dynamic testing revealed suboptimal bandwidth but useful low-frequency tactile information.
• Tactile feedback showed potential for improving hardness discrimination, though not statistically significant for hardness or size.

Conclusions:

• The prototype remote palpation instrument shows promise for enhancing tactile information in laparoscopic surgery.
• Further improvements in laparoscopic graspers are needed to fully realize the potential of tactile feedback systems.
• The study highlights the influence of instrument design on palpation performance and sensory feedback quality.