Their new technique uses a thin hollow plastic tube called a catheter to guide the patch to its destination. During the procedure, the catheter is first advanced to the organ (either through an endoscope to digestive organs or through a catheter to the heart or bladder) and then slowly guided through the perforation or defect. Once that's secure, a system of two balloons helps put the patch in place. First the balloon on the outside of the organ inflates, which deploys the adhesive patch onto the affected area. Then a balloon on the inside of the organ is inflated, which causes the ultraviolet light to turn on. This activates the adhesive properties of the glue and forces the patch to stick onto the tissue. Once finished, the balloons deflate and the catheter is removed. The patch sits on the hole until the tissue heals itself. Once it's done, the patch dissolves.