there is no medical research that supports what you say that having a catheter in for more than 2 months will damage the bladder. however catheters that stay in (called indwelling urinary catheters or "foleys") should only be used for a short period of time which has been defined as less than 30 days. if a person cannot void then a catheter is necessary but an indwelling one is used until it is determined why the person cannot empty the bladder. if it can't be reversed then the person is taught to perform "self-catheterization" when the catheter is inserted several times a day and removed after the urine is drained from the bladder.
if a person keeps a catheter in for more than two months will the bladder will be permanantly damaged?