The specialist piece of equipment, known as a flotation chair, was donated by volunteer group Friends of MDH.
Nurse unit manager Marlene Boyd said the chair would be used by patients unable to use a conventional wheelchair.
She thanked the Friends on behalf of the hospital.
“The chair is able to be used in lying and sitting positions and with all-terrain wheels can be easily manoeuvred both indoors and out,” she said.
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READ NOW“This means patients who would otherwise be bed-bound can be mobile around the hospital, as well as spending time out in the garden and grounds of the hospital as part of their recuperation.
“The chair will not only benefit patients, but assist staff with safe manual handling of these high-dependency patients.”
Friends president Rae Endersby said the group had held fundraising events throughout the year, in addition to their regular trolley round in the hospital.