A thread and a needle, staples, medical glue - nothing else in the arsenal of a modern surgeon who needs to patch up an open wound, and no. The tools are good, but outdated and fundamentally flawed, so the University of Arizona has developed an innovative replacement. It is a silk mortar sealant with gold particles that seals the wound using laser heating.
Staples and sutures are very reliable, but they are not always sterile and infection can become trapped in the suture. Medical glue does not contain germs, because it is often toxic to living flesh, including the patient's body. In addition, the dense layer of glue prevents the migration of living cells and natural healing of the wound.
Scientists in Arizona took a sealant from a bio-soluble silk thread solution, straight from silkworm cocoons, which were mixed with micro-rods of gold. This substance is inert while it is cold, therefore, after applying it to the wound, the sealant is irradiated with a laser, heating the metal nanofragments. The heat triggers a reaction between silk and proteins in living flesh and they form strong bonds. And when the laser turns off, the gold quickly cools down, and the sealant again becomes a solid, stable layer of matter, but already connected to living tissue.
Experiments have shown that the gold particle silk sealant forms a seam seven times stronger to tear and stretch than thread or glue fasteners. At the same time, no immune or allergic reaction was recorded in the experimental animals - two days after the operation, its consequences were barely noticeable. And in addition, two versions of the sealant have already been developed, for use on internal organs and for sealing wounds on the skin.