Bacteriophage is a kind of bacteria, which can prey on bacteria. At present, with the development of medical implantation technology, more and more patients receive medical implants such as urinary catheters and cardiac stents, but it also brings the risk of bacterial infection. 
Where there are bacteria, there may be corresponding bacteriophages, but their number is different.
 some researchers believe that if bacteriophages are adsorbed on the surface of implant materials and then were put into patients, the infection caused by implants could be avoided.