Ivf vs isci

Megan • Married 5 years TTC #1 for 3.5 years. Finally successful after a fet with a day 4 embryo. Due may 2017💕 Now trying for #2. FET in January
Hello all. So my husband had low number from a hernia repair surgery. We just found out he will need another hernia repair surgery this year. The fertility doctor we are seeing has suggested we do ivf with isci. Has anyone else done this? What is the difference between that and just ivf?