Robotic nurse can dress a mannequin in a hospital gown

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Flexible objects are difficult for robots to handle, but a new approach could allow artificial nurses to help patients dress



Technology



6 April 2022

Overview of the dressing pipeline. Following the CNA Practice Test guidance, we used a professional training manikin to simulate a person who has completely lost upper limb movement functionality and designed the pipeline as the following stages: stage A, the robot would navigate to the rail and grasp a hospital gown that is naturally hung on a rail; stage B, the robot would fully unfold the garment in the air; stage C, the robot would navigate around the hospital bed and lift up and dress the user?s both arms; stage D, the final operation spreads the gown to cover the upper body.

The robot handles the gown in stages

Zhang et al. (2022)

A two-armed robot can grasp a folded hospital gown and dress a medical mannequin lying on a bed. The technology isn’t yet ready for use on people, but it is an experimental step towards artificial nurses in hospitals.

Fan Zhang and Yiannis Demiris at Imperial College London tested their robot in a scenario that closely mimicked the Certified Nursing Assistant test used in US healthcare, in which a trainee nurse has to put an open-backed robe on a person with weak or paralysed arms. Instead of a human, however, they used a mannequin designed for medical training.

Flexible objects like a gown are extremely difficult for robots to work with, because their overall shape and size vary dramatically depending on how they are draped. Instead of trying to track the entire gown, the robot focuses only on key points that it needs to grasp and manipulate.

The pair partially trained the robot’s artificial intelligence control system using a computer simulation of the problem before running any physical trials. Once trained, the robot successfully dressed the simulated patient 90.5 per cent of the time.

Mehmet Dogar at the University of Leeds, UK, says that identifying key spots on the gown and largely ignoring the location of all other points “looks like a good approach”.

“When you’re putting your own shirt on, putting your hand through the sleeve, you don’t exactly know where the rest of the garment is, right?” he says.

Despite this, Dogar says that robot nurses are still some way off. “These are very specific feasibility studies we’re looking at, and nurses are much, much more than that,” he says. “If you got this robot and put it in a real hospital, even just for this task, it will fail many times due to variations in the problem. So, I don’t think we can say robotic nurses are near, but these are all research questions that we need to ask and investigate so that we can move towards that.”

Journal reference: Science Robotics, DOI: 10.1126/scirobotics.abm6010

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