The King James version translates it as that your prayers be not hindered.

Lots of females take offense at the word weaker vessel but as there are many strong women of faith in the Bible.
Who took on many roles and they deserve honor and are called heirs of the grace of life.

That word is not used to demean women.
But a women is usually physically weaker than their husbands maybe socially too and more vunerable.
They bear the children and women tend to be on the receiving end of most physical and emotional abuse.

Which in society is the truth. The Bible points this out and wants society to be fair to women.
This is a benefit to the honor and dignity of women in Gods eyes.

This is an interesting site..

http://betterbibles.com/2005/07/19/what-is-a-better-translation-than-the-weaker-vessel/