IVF with icis

Hello me and partner have just received the news he has 0 sperm after having a vesctomy reversal nearly 2 years ago our consultant has said only way forward is <a href="https://glowing.com/glow-fertility-program">ivf</a> with icis I’m just wondering what this is all about and Wots it involves success rates we are going back to see in but appointment isn’t for a month thanks