What is fertilisation and how it is achieved with ICSI?

Human fertilisation starts from entry of a healthy sperm into a human egg followed by mixing and division of genetic material. Fertilisation usually occurs in the ampulla of the fallopian tube.The result of this union is the production of a zygote cell, or fertilised egg, initiating  development of an embryo which grows into a baby.

This process requires a healthy tube, motile and healthy sperm in good numbers and a good quality egg.

Fertilisation can fail due to low sperm production, abnormal sperm function or blockages that prevent the delivery of sperm. ICSI refers to the laboratory procedure which overcomes hindrance in fertilisation failure due to male infertility. Through ICSI a single sperm is picked up with a fine glass needle and is injected directly into each egg. ICSI can also be done with frozen sperms. It is offered in cases of male infertility. 

Read more @ https://femelife.com/ivf-fertility-care/how-is-icsi-treatment-different-from-ivf/