My father is having renal stones on both kidney. 3 stones each in both the kidneys size in one 32 mm, 8mm & 16mm in left and 20mm, 10mm & 3mm in right kidney. he is 72 years now(known case of IHD, AF, HTN, cellulitis & DM. Dr. suggested for open surgery. Kindly advice me how to go about this?