Alec surgery update

We've gotten word from the surgical staff that things are going well for Alec.  They were going to put  some kind of coils into some collateral blood vessels to block them.  When they got in, they found that the vessels were somewhat bigger than anticipated, so they're putting in a device of some sort. What does all this mean.  We have no idea, but apparently everything is going well.  More later.  Matt & Joan