Sean Purchase, 15, hit a grey Vauxhall Astra on Wadsworth Road, Great Barr, in Brimingham on February 2.
A quick-thinking driver used his van to shield the lad from further harm while a woman performed CPR until a passing police officer took over.
Medics raced Sean to Birmingham Children’s Hospital under police escort for intensive treatment.
But he lost his fight for life on March 6, The Birmingham Mail reports.
Speaking about their loss, his family said: “Sean was the strongest person anyone could meet and we are so proud of him and have been truly blessed to have him in our lives.
“Life will never be the same for all his family and friends however his kind nature and awesome sense of humour will never leave our hearts.
“As a family we would like to thank everyone for their kind words and support at this devastating time.”
The driver stopped at the scene and was helping police with enquiries.
Speaking at the time, Insp Neil Griffin, of West Midlands Police, hailed the Good Samaritans who rushed to help the teenager.
He said: “What those passers-by did was above and beyond that which you’d expect of any Good Samaritan.
“The courage and humanity they displayed in such traumatic circumstances was truly commendable.
“I’d also like to praise the actions of my officers and the paramedics.
“I know they have been deeply affected by what they saw at the scene.
Witnesses should call Pc Damian Gibson at the Collision Investigation Unit on 101 ext 843 6056 or emailing firstname.lastname@example.org