My father is paralysed since last 8 years. Left side of the body is not working at all. We have recently found that there is a 15mm stone in gallbladder due to which he is not able to digest his food and also he is not able to pass urine. His medical history is that he has had 4 heart attacks and one stroke post which he became paralyzed. Generally his BP reads as 100 / 70. Please advise the treatment for removal of stone from his gallbladder.