There was "no possible justification" an Aboriginal man to be shackled to a hospital bed while he lay dying and he should have received medical intervention earlier, a coroner has found.

Kamilaroi man and father of four Eric Whittaker, 36, lay unconscious and shackled in leg cuffs in the hours before he died from a ruptured brain aneurysm at Westmead Hospital on July 4, 2017.

He had made 20 emergency calls for help over the intercom in his Sydney prison cell on the morning he was taken to hospital but officers waited for a change of shift to attend to him.

Father of four Eric Whittaker with one of his children.

State coroner Teresa O’Sullivan on Friday released her findings into Mr Whittaker's death and said while she was pleased the organisations involved had since modified their policies, there was still "so much more that needs to be done to tackle inherent disadvantage and incarceration rates" for Indigenous people.