Flexible Soft Robots: Revolutionizing Surgery and Medicine | Giada Gerboni, TED

Biomimicry takes four fundamental principles from nature: (1) Energy - how energy functions in nature, (2) Materials - how materials from animals and plants work, (3) Structure - how natural structures function, and (4) Resilience - how organisms survive environmental challenges through evolution. These principles are then implemented in design solutions.

Biomimetic design is an engineering approach that draws inspiration from nature's solutions to solve human problems. The core principle is that if something works well in nature, there's no need to reinvent it. Examples include Mercedes-Benz's Bionic car (modeled after the boxfish with low drag coefficient), humpback whale tubercles applied to wind turbine blades (MIT study showed they generate same power at 10 mph that conventional turbines do at 17 mph), bullet trains inspired by kingfisher beaks, Velcro inspired by burrs, and architectural designs mimicking termite mounds for passive cooling.

Biomimicry is the practice of designing structures and systems by copying solutions found in nature. The motivation for biomimicry is that nature has evolved highly innovative and creative solutions to difficult problems over millions of years. Rather than trying to develop entirely new solutions from scratch, engineers can study natural systems and replicate their functional principles. This approach has led to impressive innovations such as Japanese bullet trains inspired by bird beaks, Velcro fasteners, and passive ventilation buildings modeled after termite mounds.

Biomimicry (or biomimetics) is the study of biological designs to help develop and improve technologies. Examples include: studying gecko feet to develop adhesives using electrostatic forces, designing buildings after studying termite mounds, designing wind turbine blades after studying humpback whale fins, and Velcro was designed after studying burrs that attach to animal hairs. The development of a robotic knee joint mimicking the human knee's 4-bar and cam mechanisms demonstrates this principle.

Biomimicry is the practice of designing products and systems by mimicking nature's solutions. The Shinkansen bullet train redesign demonstrates this: the Kingfisher's beak shape inspired the train's nose to reduce tunnel noise, the Adelie penguin's smooth body inspired the pantograph supporting shaft for lower wind resistance, and the owl's feather serrations inspired the pantograph design for noise reduction. The redesigned train was 10% faster, used 15% less electricity, and stayed under the 70 decibel noise limit. This approach, coined by Janine Benyus in 1997, involves bringing biologists to design tables. Biomimicry operates at three levels: mimicking form (like self-cleaning lotus leaf structures), mimicking processes (like ant communication or self-organization in software), and mimicking ecosystems (like the circular economy with no byproducts). Life has been around on Earth for 3.8 billion years, providing a vast repository of research and development time that designers can learn from.

Navigation technology in minimally invasive spine surgery (MIS) provides increased accuracy and improves surgeon performance by addressing visualization limitations when working through small portals. Since its adoption around 2008, navigation has become essential for providing real-time positional information about instruments relative to anatomical structures. A significant benefit is reduced radiation exposure for both surgical team and patient, as navigation eliminates the need for continuous fluoroscopy during procedures like T-LIF where traditional methods may require 3-4 minutes of fluoroscopy time. Successful navigation-assisted MIS requires careful room setup with the patient positioned prone on the Jackson table, arms tucked to allow imaging modalities to slide freely. Once image capture is complete, the table position should not be altered. The navigation camera should be positioned at either the head or foot of the bed, and the intraoperative imaging modality should remain in the room for immediate access. Reference frame placement is the most critical concept, with systems using either spinous process clamps or pelvic pin clamps. Pelvic pins are placed from lateral to medial, aiming toward the greater trochanter, creating a rigid construct. Maintaining an unobstructed line of sight from the navigation camera to the reference frame is the absolute most critical factor for successful navigation-assisted surgery.

Minimally Invasive Surgery (MIS) requires understanding key principles including cavity creation through pneumoperitoneum, video visualization instead of direct vision, and the fulcrum effect where instrument movement is opposite to desired tissue movement; critical safety considerations include proper electrosurgery electrode placement (closest to surgical site, flat, on muscular tissue), hysteroscopy fluid management with constant pressure variable flow systems, and ergonomic positioning to prevent surgeon injury; successful MIS depends on teamwork, proper equipment setup, and systematic safety checklists.

Minimally invasive surgery represents a fundamental shift from large open procedures to small incisions, offering benefits including smaller scars, reduced muscle and nerve damage, shorter hospital stays (from weeks to days), and lower costs. This trend gained momentum in the 2000s and continues growing. However, smaller incisions create visibility challenges that necessitate advanced imaging technologies. C-arm X-ray systems provide real-time bone imaging during vascular, orthopedic, and spinal surgeries, consisting of an X-ray source and detector mounted on a movable arm. Surgical navigation systems address visibility challenges by providing real-time spatial guidance, overlaying virtual instrument positions onto pre-operative CT scans like GPS guidance. The technology reduces radiation exposure compared to repeated X-ray imaging while enabling complex procedures through minimal openings.

Minimal invasive spine surgery offers benefits primarily in moderate-complexity cases, particularly lumbar spinal stenosis requiring one to four level fusion. Three pillars of complication prevention are teaching, training, and patient selection—surgeons must match operations to appropriate patients and pathologies. Navigation serves as a critical accuracy tool, encompassing freehand navigation, robotics, augmented reality, and virtual reality as complementary technologies. Clinical outcomes demonstrate MIS achieves comparable fusion rates to open surgery with slightly lower complication rates, though infection rates are significantly reduced due to minimal tissue exposure. CSF leaks (3-5% incidence) require prompt management with fibrin glue for small leaks or primary closure for larger ones. Non-union prevention relies on meticulous disc preparation (10-20 minutes end plate scraping) and autograft use. Total navigation workflows enable single intraoperative CT scans, minimizing radiation exposure while maintaining accuracy throughout the entire surgical procedure.

Minimally invasive spine surgery faces core challenges: limited anatomical visualization forces reliance on tactile feedback and increased X-ray usage. Navigation systems address these challenges by improving accuracy (especially for pedicle screws), reducing radiation exposure to OR staff, and providing real-time spatial awareness. Two primary navigation types exist: electromagnetic systems using field generators and sensors, and optical systems using infrared tracking cameras. Both improve learning curves and localization, though electromagnetic systems track instrument tips directly while optical systems extrapolate from fiducial positions.

Elastomers are polymers with weak van der Waals forces that can be stretched and return to their original shape (e.g., rubber). Homopolymers are polymers made from only one type of repeating unit. Biodegradable polymers can be decomposed by microorganisms. The instructor explains these classifications and their importance in materials science.

Elastomers are viscoelastic polymer materials that exhibit both elastic and viscous properties, allowing them to stretch significantly and return to their original shape without permanent deformation; they achieve this unique flexibility through minimal cross-linking between polymer chains, distinguishing them from other polymers like thermoplastics which lack significant cross-linking and thermosets which have extensive cross-linking that limits mobility.

Materials science bridges engineering, chemistry, and physics to study material properties at the atomic level, examining how atoms behave in materials like glass, steel, wood, and plastics to understand properties such as hardness, flexibility, and sharpness. Smart materials represent a revolutionary category of solid objects whose properties—shape or color—change in response to external stimuli like heat, light, moisture, pressure, or magnetism. Historical examples include pine cones (natural smart materials that open/close based on humidity) and ancient Egyptian self-healing lime mortar that repairs cracks using air moisture and carbon dioxide. The first scientifically recognized smart material was piezoelectricity, discovered by Pierre and Jacques Curie in 1880, demonstrating how mechanical stress generates electricity in certain crystals. This discovery revealed that materials could actively perform useful functions rather than merely being acted upon, transforming materials development and design approaches.

Polymers are macromolecules formed by repeating monomer units with high molecular weight. Elastomers are a specific class of polymers with elastic properties, commonly known as rubbers. Polymers have diverse applications including packaging, automotive parts, textiles, and advanced materials like fuel cell membranes. Smart polymers respond to environmental stimuli for applications in separation and artificial muscles. High performance polymers include plastics, fluids, membranes, and elastomers designed for specific societal needs.

Smart materials are intelligent materials that sense environmental changes and respond accordingly. Shape memory alloys change shape in response to temperature changes, returning to their original form when cooled. Piezoelectric materials contain electric dipoles that generate electrical energy when mechanical force is applied, and deform when electrical pulses are provided. Magnetostrictive materials respond to magnetic fields in addition to mechanical stress. These bidirectional energy conversion capabilities make smart materials valuable for energy harvesting, precision motion control, and specialized applications requiring environmental responsiveness.