My interpretation: The heart is still in the chest cavity, indicating there is still a capacity for love. However, it is disconnected from pumping blood through the body, representing there is nothing more to bleed and also signifying a disconnection from the body.
The gaping hole represents an emptiness where there should be human connection. The hole is still raw to represent the suffering this causes.
Because of this emptiness, chakra energy, life energy is able to transmute the suffering into something good and usable.