Histology wise, ingrowth of connective tissue into the canal space was observed. He ratios due to ingrowth of He from radioactive decay. Every gland is formed by an ingrowth from an epithelial surface. This section is designed to resist fatigue and promote tissue ingrowth. This material allows for fibrovascular ingrowth within several months. Ti-6Al-7Nb also shows a high compatibility to ingrowth to the human body. However, the incidence of epithelial ingrowth appears to be higher after subsequent enhancement LASIK procedures. The cuff also causes tissue ingrowth into the device for long term securement.