The term key hole surgery probably refers to laparoscopic tubal occlusion or minilaparotomy. Whichever is the surgery you have undergone for avoiding a pregnancy, it is either tubal occlision or tubal ligation. In either case, the tubes gets damaged anotomically at the site of surgery. These tubes carry the ovum or the egg from ovary to the uterus and most of the times, the egg gets fertilized by man s sperm somewhere in the tube. Therefore occluding/ligating the tube prevents the prenancy. This surgery is referred to as a way of permanent contraception. However, this surgery can be reversed. For this purpose you will have to undergo another surgery called as tuboplasty. This is not as simple and a short surgery as the original surgery you have undergone for avaoiding the pregnancy. This is a major surgery. This is a highly skilled job and should be got done from expert surgeon in doing this surgery. You cannot guarantee the pregnancy 100% after tuboplasty, its sucess rate is not very high. If you are so keen on getting a child from your current husband, you may try this option, but with full understanding of its sucess and that it is a major surgry. Wish you all the best for your future child-bearing career.