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The University of Delaware Center for Composite Materials (CCM) has a new research program with the objective to able to use a 3-D “printer” to produce a custom orthotic device for a soldier with a severe lower extremity injury, constructed of strong and durable yet lightweight composite materials, designed to meet the user’s specific needs.
The idea is that these will be fabricated in just 24 hours, and their “tunable” properties allow it to be modified to meet the wounded warrior’s changing needs over the course of rehabilitation.
Led by Jack Gillespie and Shridhar Yarlagadda, CCM explains that they recently received a grant from the Defense Advanced Research Projects Agency (DARPA) to develop a rapid prototyping process for the manufacture of advanced passive dynamic ankle-foot orthoses (PD-AFOs) for injured soldiers. The three-year, $3-million project will be carried out in collaboration with UD’s BADER Consortium, which will enable the new devices to be tested in clinical trials.
Steven Stanhope, who leads the BADER Consortium and is a co-investigator on the new DARPA project, explains that PD-AFOs, which use a spring-like action to mimic the normal motion of the ankle, are enabling wounded warriors to retrain not only for a vigorous recreational lifestyle but also for active duty.
With a process known as additive manufacturing, in which 3-D solid objects are built up in layers from digital files, CCM explains that Stanhope has invented a patent pending process for the rapid manufacture of PD-AFOs from “neat,” or unreinforced polymers. However, these materials are limited in strength and durability, and the devices must be thick and heavy to meet the soldier’s need for active duty. In contrast, they say high-performance composites can reduce device size and offer improved mobility.
“If we can take full advantage of composites — which are 40 times stiffer and stronger than conventional materials — we can pare these devices down to the point where they will be thin enough to be readily worn within a shoe,” Gillespie says. “We can also use the anisotropic properties of composites to ‘stiffness tune’ a device to an individual patient’s impairment profile, enabling an unprecedented level of customisation, not just initially but on a continuing basis.”
However, CCM say customised composite devices require labour-intensive and specialised skills to fabricate, so the DARPA-funded research is aimed at marrying the rapid production enabled by additive manufacturing with the performance advantages of composites. They say that although this sounds like a tall order, the new program builds on their composites manufacturing science base.
“Our goal is to develop integrated tools for manufacturing to meet the system requirements,” says Yarlagadda, who directs other DARPA-funded composites manufacturing research at CCM. He explains that those tools include process models, composites analysis, composites design, materials selection, process engineering, and manufacturing workcells in a continuous feedback loop centred on the requirements of the application. In the new project, those tools will be complemented by patient data, patient foot scans, and biomechanics-based prescriptions for devices provided through the BADER Consortium.
“This is a perfect collaboration,” says Gillespie, “with CCM providing the engineering design, materials, and processes for composites and the BADER Consortium providing the network for clinical trials. Once the prototypes are manufactured, they will be tested on wounded warriors, who will provide us with valuable feedback for continuous improvement of the rapid prototyping process.”
Yarlagadda points out that the potential benefits go far beyond orthoses for injured soldiers. “Many of the technological advances that we take for granted today had their roots in military programs,” he says.
“Also, everything we do here at CCM contribute to the manufacturing science base that centre researchers began building almost four decades ago. It doesn’t matter whether the system is a military vehicle or an orthotic device — what we’re learning here will advance the state of the art of composites in general.”
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