Sent back to Mexico by the Chicago-area medical center that had treated his crippling injury, the young quadriplegic languished for more than a year in a small-town hospital ill-equipped to handle his needs. Quelino Ojeda Jimenez, who needed a ventilator to breathe, suffered two episodes of cardiac arrest in that facility as well as developing bedsores and a septic infection, officials said. On Sunday, just 30 minutes into the new year, Ojeda died at age 21, said Jeromino Ramirez Luis, director of the General Hospital of Juchitan in Mexico, which took over his care from the smaller facility last month.