The egg and early embryo are surrounded by a protective “shell” know as the zona pellucida. Before the embryo can implant in the uterine wall it must escape or “hatch” from its protective shell. Some embryos have thicker shells and become trapped. (Micromanipulation-assisted hatching was developed to overcome this problem.)
Micromanipulation-assisted hatching doesn’t help everyone, but may be helpful for some patients. Speak with your physician to determine if assisted hatching is the right option for you.