Urinary issues with a raw meaty bone diet too high in calcium???

Hi I'm looking for advice my 5 year old cat Ziggy is sick with a blocked bladder I have fed him raw meaty bones since he was a kitten with no issues but I'm now told that it's because he has had a high calcium diet I had a cat mischief many years ago who was fed dry and canned and he had the same issue I thought I was doing the right thing but now I'm confused can anyone give me some ideas

It is possible you are feeding too much calcium if you are feeding raw meaty bones and not a lot of other muscle meat to offset the bones.   I'm guessing you are also feeding organs, muscle meat, etc. though.  Perhaps your Vet is just using this as an excuse...it's hard to say. 

Some cats are just predisposed to urinary issues, and no matter what you feed, it's going to happen   Has he been under undue stress lately.  Believe it or not, stress can cause blockages!  Every time we do anything around the house (construction type stuff), I always bring out the Rescue Remedy for Pets and load 'em up, just as a preventative measure. 

BTW, I've had THREE cats get kidney disease, and the last one was on raw when she got it.  Some times you just can't win.  I'm beginning to think it's the water, so now I only give them filtered water.  Hoping that's going to save the last two. 

Thanks for giving me advice mrsgreenjeens I do give him variety of muscle etc and we have just welcomed a toddler into the house (grandson) who just wants to chase and cuddle him the vet did say it could be stress related I have heard of felaway but not rescue remedy I will look into it and I have convinced the hubby to put up a cat enclosure to give all my cats some space as I explained to him it's cheaper to put one up than to keep paying $3000 to the vet

In general cats shouldn't have more than 10% bone, some cats can tolerate a little more, some need less. High bone can cause constipation as well as other medical issues, like urinary issues. Are you feeding a commercial raw food with bone or a whole ground animal? Many of those have way, way, too much bone for cats.