Stasis chamber

A stasis chamber or suspended animation chamber was a machine designed to suspend the biological functions of its occupant, keeping them alive and unchanged for prolonged periods.

After his body was invaded by the Torajii sun, the Tenth Doctor instructed Martha Jones to put him in a stasis chamber at -200 degrees to "freeze it out" of him. (TV: 42)

Elliot Northover was kept in a stasis chamber after he was taken by the Silurians. (TV: Cold Blood)

The Fisher King planned to place himself inside a suspended animation chamber to await the arrival of his people, while the ghosts he created broadcast his coordinates. The Twelfth Doctor tricked him into leaving the chamber behind, and then used the chamber himself to return to the future. (TV: Before the Flood) The chamber was later discovered by the crew of the Drum. (TV: Under the Lake)

After her apparent murder, Anah was kept in a stasis chamber. This was what allowed the Twelfth Doctor to deduce that she was still alive. (TV: Face the Raven)

Behind the scenes

 * The stasis chamber from the episode 42 is the redecorated MRI machine from Smith and Jones.
 * In the invalid source Attack of the Graske, the Graske kept its kidnapped creatures in stasis chambers.