AMS Spring 2023

Sensors Embedded into 3D Printed Casts and Braces Will Track Patients’ Progress

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A team of researchers at Curtin University in Western Australia have devised a low-cost and portable technology which used 3D printing to assist patients with their rehabilitation following joint injuries and mobility disabilities.

The project was led by the Curtin University Department of Electrical and Computer Engineering, and it used sensors embedded during 3D printing into rehabilitation equipment worn by patients like braces and supports.

Iain Murrary and his team at Curtin University with their 3D printed sensor braces.

Dr. Iain Murrary (far right) and his team at Curtin University with their 3D printed sensor braces

The rehab equipment has inertial measurement tools embedded inside which can read and interpret acceleration and angular velocity caused by movement in three dimensions.

“We embed these into the normal braces or casts people have on the limb in question,’’ says senior lecturer Dr. Iain Murray. “We can then log and examine how the person is moving.”Blind

A good share of Murray’s work has centered on what’s called Assistive Technology, and his role is to act as main contact point and coordinator of the research. In the past, he’s focused on eLearning modalities for the vision impaired, and he’s used 3D printing in his work on those projects as well.

“One of our main focuses at the moment is on the treatment and here we can watch how people are doing their physiotherapy exercises, see how long they are doing them for and because we have modeled the movement we can see if they are doing the exercise correctly,’’ Dr. Murray says.

Dr. Murray says the technology is used to measure the efficiency of treatments, and his team has completed a number of trials which used 3D printing to build the splints and embed the sensors in one operation.

“So rather than having to hand-make these splints and devices – the rigid ones – that you put on people, we scan the limb using a 3D scanner and then we 3D print it out and the sensors are embedded into the device after printing,’’ Dr. Murray says. “We just print the splint out.’’

aaaUsed to treat injuries and chronic disorders like cerebral palsy, muscular dystrophy, and motor neuron disease, Dr. Murray and his team are working with Princess Margaret Hospital for Children to begin trials of the system for children with cerebral palsy.

According to Dr. Murray, while work like theirs has been done in the past, the team’s use of 3D printing technology makes the devices cheaper — and portable.

“They can wear it all the time so we can get much longer login periods,” Murrays says. “We can examine the data in more detail, and our system costs a few hundred dollars.’’

Murray also worked on a project to embed sensors within the classic aid for the visually impaired, the white cane and a project to build a 3D printed, graphical reading device as well.

Have you heard about any other projects which use 3D printing to embed sensors for medical devices? Let us know in the Sensors Embedded In Casts and Braces With 3D Printing forum thread on 3DPB.com.

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