Suggest Treatment For Painful And Low Urine Output

My father is 55 yrs of old. He has problem with his urination for past 1 year like there is no frequent outflow of urine. His creatinine level is 4.1 and recently 3 weeks back, he has heart stroke. We consulted doctor and they identified a block in his urination (penus) and they told that it has been formed because of cathertine(insertion of tube for urination during surgery). My father also underwent a surgery 3 yrs back as he has twist in his intestine. Now, doctor advised to go for a surgery (using laser) to remove the block. His blood pressure is normal. Since he had a MI few weeks back, he is under the medication of clopilet. When consulted with cardiologist and urologist. Urologist said we will wait fro next 6 weeks time as there could be metabolic changes right now for proceeding for surgery to remove the block. Can you please let me know whether he can go surgery after 6 weeks or he can undergo now. However, my father is able to urinate in a daily basis but it pains for him while urinating and its at irregular intervals.