Constrain elbow using IK and mecanim

Unity Engine
1

Hi, I will like to move the arm of the character using Ik , but I will like to constrain the movement of the elbow in some places. I am using mecanim.

any ideas?

2

I am using Inverse Kinematics v1.31 and now I can control the elbow movement , but I am interesting if I can do the same thing with mecanim ik system .