An inmate who attacked two prison officers and tried to throttle a healthcare worker has been jailed for another five years.
Paul Anthony Carpenter gripped the health worker's T-shirt so tightly around his neck his colleagues had to rip it off so he could breathe.
One of the prison officers suffered permanently impaired sight in one eye and another was stabbed in the arm with a pencil.
Leicester Crown Court was told Carpenter (23) presented a substantial risk of harm to public sector workers.
The judge in the case added an extra five years to his licence period.
Philip Gibbs, prosecuting, said Carpenter carried out the first attack on January 5, 2011, within a few days of arriving at Glen Parva Young Offenders' Institute.
He had just been told he was being reported to the Governor for earlier threatening behaviour towards the guard, when he "launched himself at him".
Mr Gibbs said: "The defendant punched him three or four times to the head, stunning him, and got him in a head lock."
Carpenter thrust his thumb into the guard's left eye, causing it to drip with blood.
In another incident, at Leicester Prison on June 13 last year, a senior officer was trying to stop Carpenter from self-harming with a pencil, which he was pushing into a wound on his arm.
Carpenter, of no fixed address, was shouting: "If you come closer, I'll stab you."
Mr Gibbs said: "He took the pencil out of the wound in his arm and swung at the prison officer, who received a puncture wound, with all the associated health risks involved."
Pieces of the pencil were embedded in the officer's arm, which was left scarred.
On August 22, the defendant was at Leicester's Arnold Lodge psychiatric hospital, and resisting being taken to a seclusion area.
He lay flat and rigid on the bed, shouting at staff, refusing to move.
A male healthcare support worker was assisting staff when the defendant hit him twice on the back of his head.
He then twisted the victim's T-shirt around his neck, "restricting his breathing and ignoring all warnings to stop," said Mr Gibbs.
He told the court: "It was after 30 seconds, staff members ripped the T-shirt off him, freeing his airway.
"He suffered bruising and swelling to his neck and right shoulder and couldn't move his neck, causing him to be off work for three weeks."
Carpenter admitted three counts of causing actual bodily harm.
The court heard in 2010 he was jailed for 30 months for arson, later committing a public order offence and assaulting a police officer.
Judge Simon Hammond said: "The aggravating factors are these were three serious acts of violence.
"He appears to be remorseless and presents a serious risk of danger to other public sector workers."
Although suffering from a personality disorder, Carpenter was not said to be mentally ill to the extent he was suitable for treatment.
He refused to co-operate with a Rampton Secure Hospital psychiatric assessment – and there was no place available there for him.
Christine Luckock, mitigating, said there were "substantial delays" bringing the case to court, and it was a year before he was charged with the first offence.
Miss Luckock said Carpenter's personality disorder manifested itself with self-harming and in his violent reactions to those in authority.
