Soft Touch Sensors Restore Surgeons’ Sense of Feel in Minimally Invasive Procedures

Keyhole surgery helps patients recover faster, but it removes one of the surgeon’s most important tools: the ability to feel how much force is being applied to fragile tissue. Without tactile feedback, even experienced surgeons can unintentionally grip too hard or too softly, increasing the risk of tissue damage. Researchers at NYU Abu Dhabi have developed a new class of soft, flexible sensors that address this problem by restoring real time force sensing to minimally invasive instruments. Their goal is to bring back the intuitive touch that surgeons lose when operating through long, rigid tools.

The sensors are made from soft silicone embedded with tiny liquid metal channels. When pressure is applied, these channels deform slightly, changing their electrical properties. This change allows the system to detect and quantify force with high sensitivity. Because the sensors are soft and deformable, they can capture both very light contact and stronger gripping forces within a single device. This wide dynamic range is essential for surgery, where the difference between safe manipulation and tissue injury can be subtle.

To demonstrate the technology, the research team integrated the sensors into a laparoscopic grasper. One sensor was placed on the handle to measure the force applied by the surgeon’s hand. Another was positioned on the jaw of the tool to measure how the instrument interacts with tissue. This dual sensing approach provides continuous feedback from both ends of the instrument, giving surgeons a clearer understanding of how their movements translate to forces inside the body. The design is modular, allowing sensors to be placed on the handle when sterility at the tip is a priority or directly on the jaw when precise measurement is required.

The study shows that the sensors can be adapted for different surgical tools by adjusting their size and material properties. The researchers emphasize that the system is practical for real operating environments because it is compact, flexible, and easy to integrate with existing instruments. The technology also has potential applications beyond surgery, including robotics, wearable devices, and any system that requires accurate force measurement.