Laser “stitched” the wound

  Unfortunately, the wound after stitching is as unsightly as a centipede. It takes a long time to recover slowly. During this period, bacterial infection should be avoided, and scars may be left after the stitches are removed… The traditional suture technique has many “slots” that are unbearable . So, if there is a method that only irradiates the wound with laser light, in the blink of an eye, the wound is healed and almost recovered, would you like to try it?
  Laser “stitching” wounds is not just a superpower that appears in science fiction films. Scientists have confirmed the feasibility of this technology several years ago. They call it a stitch-free photochemical technology. Why can laser suture wounds? How does it do it? The principle is actually very simple. Doctors apply some photosensitizer to the wound of the patient. Under laser irradiation, the photosensitizer will release electrons and the molecular structure will change. When these structurally unstable photosensitizer molecules meet the collagen molecules at the wound, electron transfer occurs between the two, re-forming a new covalent bond and cross-linking combination, so that the wound will be connected and healed quickly.
  One of the founders of laser suture technology, Yao Min, a doctor at the Shanghai Jiaotong University School of Medicine, successfully sutured the rabbit’s cornea with a laser. Yao Min divided the 48 rabbits into two groups and made wounds of the same size and depth on the corneas of all rabbits. Then, one group of rabbits was subjected to traditional corneal suture, and the other group of rabbits was sutured by laser: put a few drops of rose red photosensitive dye on each side of the wound, put the laser on top of the wound, and use a green color similar to the size of the wound. The laser irradiated the wound for more than a minute, and the wound gradually healed at a speed visible to the naked eye.
  After the operation, the recovery of the two groups of rabbits was completely different: the rabbits with traditional sutures could not open their eyes and shed tears after waking up, and resumed activity the next day; while the rabbits with laser stitches would play as soon as they were awake. Observed again after 28 days, the scars of the rabbits were also different. The scars of the rabbits with traditional suture technology were obviously more than those with laser suture technology.
  Yao Min’s team also carried out a comparison experiment of suturing blood vessels and nerves. The results found that the vascular restenosis and nerve pathway blockage caused by needle suture were greatly reduced due to the use of laser suture technology. In addition, the new technology also has a better effect on the closure of the ureter, intestine and other parts.
  Laser “stitching” wounds can perfectly avoid all the disadvantages of traditional stitching methods: fast healing time, short recovery time, effectively reducing bacterial invasion and inflammation, and it will not leave unsightly scars after healing. In a hospital in Shanghai, many patients have already experienced this technique, and they are all satisfied with the suture effect.
  However, the laser “needle” is not omnipotent. The light cannot penetrate the bottom layer of the skin, so only superficial tissues can be sutured. It does not work for colored and opaque tissues such as bones and muscles. Of course, scientists are also continuing their efforts to broaden the scope of laser work. For example, doctors at Harvard University in the United States invented a wave guide, which can be put into a wound and emit laser light, irradiating a deeper wound under the skin to make it heal, and then the wave guide There is no need to take it out, it will gradually degrade and disappear. With this waveguide, laser suture of subcutaneous wounds will be realized.
  In the future, laser stitching may replace needle stitching and become the mainstream stitching technique. It is no longer an illusion that the wound will heal instantly when the finger is brushed over the wound.