A term for the purpose, not the design
“Lifting aid” describes what a device is for: it takes the weight of a load off the person. How it does so is left open. A rope balancer is a lifting aid just as much as a vacuum lifter, a lifting axis or a manipulator with a rigid arm.
The term comes from occupational safety. Whoever uses it in an enquiry has named the aim – less strain in lifting and carrying – but not yet the task. Only the task decides the design.