In modern surgery, the oldest tools can be the most problematic. Take closing a wound. Sutures require puncturing delicate tissues, creating micro-tears, and leaving behind stress points that can fail under pressure. Staples can cause chronic inflammation. Traditional chemical adhesives like cyanoacrylate (Super Glue) break down, fail to adhere, or can become toxic when applied to wet, living tissue inside the human body.
Faced with the challenge of binding soft, slippery, and blood-bathed internal organs, biomedical engineers are turning to nature. Because nature has already spent millions of years solving these adhesion problems. Barnacles and mussels cling to storm-swept rocks and boats and geckos run effortlessly upside down on glass. So, scientists are studying how evolution created these feats of engineering.
Anyone who has ever tried to scrape a mussel off an ocean pier knows how tenaciously they cling to surfaces. What makes this feat remarkable isn’t just the strength of the bond, but also the environment. These creatures form ultra-durable underwater bonds in seconds, despite constant waves, saltwater corrosion, and high humidity.
For mussels, engineers discovered that the secret lies in specialized proteins which are rich in a unique amino acid called L-DOPA. These proteins form bonds that displace water molecules on a surface to create the medium for a bond. The compound bonds remain, even when immersed.
By synthesizing these compounds using mussel foot proteins, medical researchers have developed a new generation of surgical adhesives.
Barnacles have also inspired medical glues. Barnacles naturally stick to wet, slimy boat hulls by releasing a small droplet of oil that repels water, clearing the surface so their sticky proteins can bind tightly. Mimicking this trick, researchers at institutions like MIT have developed experimental barnacle-inspired surgical pastes. These bio-glues repel blood and stop severe internal bleeding in as little as 15 seconds.
Mussel and barnacle-inspired glues can seal bleeding arteries, intestinal leaks, and fetal membrane ruptures where conventional sutures fail. Unlike synthetic superglues, these protein-based formulas biodegrade naturally without releasing toxic byproducts, causing minimal immune response. Glues modeled after mussel and barnacle chemistry can dynamically break and reform chemical bonds under stress, allowing surgical patches on beating hearts or contracting lungs to flex repeatedly without tearing away.
While barnacles and mussels provide the blueprint for wet chemical bonding, geckos offer a masterclass in dry adhesion. A gecko can support its entire body weight on a smooth wall using a single toe, yet it can release its grip instantly without leaving any residue.
The solution is physics. A gecko’s foot pads are covered in millions of microscopic hair-like structures which split into even tinier structures. When these nanoscale structures touch the surface, they generate van der Waals forces (which are weak electrostatic attractions between molecules) that when multiplied across millions of contact points become immensely powerful.
Researchers have engineered flexible polymeric tapes that mimic gecko foot structures. These “gecko patches” can stick securely to slippery internal organs without chemical adhesives.
Traditional medical tapes often tear delicate skin upon removal—a major risk for infants and elderly patients. Gecko-inspired tapes distribute force evenly, offering strong lateral grip while peeling off smoothly when pulled at a specific angle.
Some of the most promising surgical materials fuse gecko-like micro-structured surfaces with mollusk and crustacean-inspired adhesive coatings. The result is a double-action surgical tape that mechanically clings to wet tissue while chemically cross-linking for long-term hold.
The next step is to develop ways to produce these technologies in large enough quantities to be used in clinical setting. That transition is accelerating. Researchers are using recombinant DNA technology to produce barnacle and mussel adhesive proteins in bacterial cultures, while 3D nanolithography allows manufacturers to mass-produce gecko-patterned surgical tapes.
These nature-inspired adhesives promise to transform minimally invasive surgery, organ transplants, and emergency trauma care.
Anyone who has had stitches welcomes this new technology.
