A man under police supervision at a hospital in Brooklyn was shot four times late Wednesday night while attacking a police officer, officials said.

Officer Mikhail Vinitsky, 29, suffered a concussion and required six stitches on his head, police said. The perpetrator, Miguel Gabriel, was in stable condition last night.

Officer Vinitsky was standing watch over Mr. Gabriel, who had been arrested two days earlier and charged with assaulting his father and resisting arrest. A police source said he was infected with hepatitis, which required him to stay at Kings County Hospital with his right hand handcuffed to the bed.

At about 11 p.m., Mr. Gabriel ripped off part of the plastic bed frame and attacked Officer Vinitsky, police said.

Officer Vinitsky could not subdue Mr. Gabriel with his baton, police said, and while being beaten on the head, he fired off six rounds. Mr. Gabriel was hit twice in the abdomen and once in each forearm, police said. Another officer also used Mace to subdue Mr. Gabriel, who was still fighting after being shot, police said.

Mr. Gabriel has yet to be charged in the attack because he is still in the hospital.

This is the seventh attack on an officer this month, and the 13th this year. On Tuesday night, a member of the Bloods gang shot Officer Rory Mangra, 27, in the foot while attempting to evade arrest on a marijuana charge in the Park Slope section of Brooklyn. Two hours later, police arrested David Carter, 19, after he fired several rounds at police officers trying to break up a fight between several women.

Two auxiliary police officers were fatally shot on March 15 by an ex-Marine who also killed a waiter in Greenwich Village.