"Both are set to appear at Birmingham Magistrates Court tomorrow (12 August)."
The injured officer was due to undergo further surgery on Sunday.
Superintendant Tom Joyce said: "It's difficult to give a prognosis at the moment. They are certainly potentially life-changing - but we are relieved to say, we understand they are not believed to be life-threatening.
"His wife is aware of the incident and is with him at this time."
The officer has been with West Midlands Police for 17 years, and worked as a traffic officer for the last 12 of those, and Supt Joyce said his father had also been a police officer