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University of Delaware research scientist Sagar Doshi is developing next-generation wearable technologies capable of detecting precise changes in human movement. The UD-developed sensors embedded in Doshi’s wearable technologies can provide physical therapy clinicians and athletic trainers with useful data to make data-driven decisions about their patient’s or athlete’s recovery. As an Innovation Ambassador at UD, Doshi is sharing what he’s learned about invention with others.

Innovation at UD: Sagar Doshi: youtube.com/watch?v=bkI0baCyn5M

Innovation Ambassador: Sagar Doshi

Photo illustration by Jeffrey C. Chase | Video by Ally Quinn and Sam Kmiec

Leveraging UD’s innovation ecosystem to develop next-generation wearable technologies

Editor’s note: The University of Delaware is diligently working to enhance infrastructure and support available to campus innovators. As part of this effort, the U.S. National Science Foundation's Accelerating Research Translation program (NSF ART program) at UD is investing in capacity-building resources to boost the translation of UD research discoveries into novel technologies of benefit to Delawareans and the nation. UD is an inaugural member of the NSF ART program.

For thousands of years, our clothing has primarily been used for protective and aesthetic uses. University of Delaware inventor Sagar Doshi thinks apparel is capable of more. He wants to make our clothing smarter, so that we can get more information about how we move.

Why is this necessary? About 3 million Americans undergo physical therapy each year to recover from injuries such as a ligament tear, or after surgery, such as a knee replacement. 

Doshi, a research scientist at the Center for Composite Materials (CCM) and a research assistant professor of mechanical engineering, is developing next-generation wearable technologies with the ability to provide physical therapy clinicians and athletic trainers with useful data to make data-driven decisions about their patient’s or athlete’s recovery. 

The UD-developed nanomaterial-based sensors embedded in Doshi’s wearable technologies contain carbon nanocomposites, which are over 1,000 times smaller than a human hair and impart unique electrical properties when deposited on everyday fabrics like cotton, polyester or elastane. This allows the material to measure precise changes in human movement. Combined with the newest repair technologies, these novel sensors also have the potential to make our civil infrastructure safer, from bridges to pipelines. 

These are big aspirations for a technology that grew out of Doshi’s UD doctoral work. That early research led Doshi in directions he had dreamed about but wasn’t sure how to make happen … from inventor to patent holder to entrepreneur. He didn’t get there alone. He’s had significant help along the way.

As an Innovation Ambassador at UD, Doshi wants campus inventors to know how the UD innovation ecosystem has been there for him — and that this growing network is available to others, too.

Tell us about your invention.

Doshi: We are developing the next generation of wearable technology. The key problem that we are trying to address through this invention is providing improved techniques that clinicians, physical therapists and athletic trainers can use to measure progress or improvement for patients and athletes who are undergoing rehab after an injury. We are going beyond what Fitbit and smartwatches can do. The data our wearable technologies collect can help physical therapists, clinicians and athletic trainers to make informed and data-driven decisions for providing better care to patients and athletes so that they can safely recover faster.

UD inventor Sagar Doshi and his collaborators have developed a fabric coating that contains thin, lightweight and flexible pressure sensors that can be embedded into wearable garments, providing the ability to measure precise changes in human movement.
UD inventor Sagar Doshi and his collaborators have developed a fabric coating that contains thin, lightweight and flexible pressure sensors that can be embedded into wearable garments, providing the ability to measure precise changes in human movement.

How does your invention differ from what's already in the market?

Doshi: Right now, the state-of-the-art technology that is used involves an instrumented treadmill and motion capture cameras, which are limiting in that they are extremely expensive and complicated to use. Our goal is to develop low-cost, wearable sensors that provide easy-to-interpret data that can be used by PT clinicians and athletic trainers to inform patient care and recovery. Our fabric-based sensors are comfortable to wear, with high sensitivity and the ability to measure the key parameters that clinicians require, such as a person’s range of motion or force applied during walking.

What impact do you envision your invention having on society?

Doshi: Initially, we are focused on patients and athletes who are recovering from injuries, but eventually, we see our sensor technology having wider applications beyond human use. We consider it a platform technology. Depending on the type of fabric on which we deposit our nanomaterials and the processing conditions we employ, these sensors have wide-ranging applications from wearable technology to measure gait and human movement, all the way to materials for structural health monitoring of our civil infrastructure — to detect cracks in our bridges or leaks in our pipelines.

Students involved in the research gain valuable work experience, while learning how many different aspects of science and technology come together to make interdisciplinary inventions with the ability to better human health.
Students involved in the research gain valuable work experience, while learning how many different aspects of science and technology come together to make interdisciplinary inventions with the ability to better human health.

What support and guidance have you received from the UD innovation ecosystem?

Doshi: One of my mentors at Horn Entrepreneurship says it takes a village to make an invention or a startup successful. I’ve had many supporters and collaborators on my innovation journey. Notably, mechanical engineer Erik Thostenson, my Ph.D. adviser, played a key part in the initial fundamental research and encouraged me to focus on research translation; Jill Higginson, a biomechanics expert, provided input on end user needs and shared her lab for various studies; and being part of CCM gave me a mindset to think about how fundamental discoveries can translate into technologies with real societal impact.

Broadly, I leveraged Horn Entrepreneurship programs, early-stage startup grants that helped us show proof-of-concept results, and the Office of Economic Innovation and Partnerships, whose technology transfer staff were instrumental in helping me understand what constitutes intellectual property and how to translate it, from filing the invention disclosure to developing a commercialization strategy, patenting and more. Resources from the State of Delaware and the Delaware Innovation Space, and mentorship from other innovators also helped.

What is your advice for scientists who are interested in research translation?

Doshi: If you are interested in or are curious about what it takes to translate research to society, go outside of the lab and talk to people in the real world. Seek to understand what challenges they are facing, and that will provide ideas about what type of research you can do inside your lab to address the issues in society. Also, one non-technical piece of advice is to remember that nine out of ten people in the world, in my opinion, are there to help you. If you ask for help, people will almost always make time and give you their feedback.

Doshi’s censored materials provide improved techniques that clinicians, physical therapists and athletic trainers can use to measure progress or improvement for patients and athletes who are undergoing rehab after an injury.
Doshi’s censored materials provide improved techniques that clinicians, physical therapists and athletic trainers can use to measure progress or improvement for patients and athletes who are undergoing rehab after an injury.

How have students benefitted from engaging in innovation?

Doshi: The students benefit in multiple ways. For example, participating in an NSF I-Corps program helps students get outside of the lab and talk with real people to understand their challenges. No matter what their field of research, this helps students become better communicators. Additionally, ours is a highly interdisciplinary research program where materials scientists collaborate heavily with biomechanics experts and, more recently, with artificial intelligence experts who are using machine learning to understand patterns in our data. Many of our accomplishments are a direct result of the hard work, curiosity and commitment of the undergraduate and graduate students who have collaborated and worked with me. And students have had the chance to learn how many different aspects of science and technology come together to make an interdisciplinary invention possible.

What is one thing you wish you had learned earlier?

Doshi: The University's innovation ecosystem offers a lot of resources to help researchers take risks, learn and adapt. For example, when we first made our sensors, I immediately thought about aerospace-related applications because of my role and CCM’s extensive aerospace work. However, enrolling in the regional I-Corps program forced me to talk to potential end users, including engineers working on aerospace products. I learned about the challenges of developing new materials for airplanes and the time and resources it takes to certify them. This helped me understand that I needed to explore other potential use cases first, to validate the technology, scale up the manufacturing and build a sustainable business around it, and then go after more ambitious end-use cases.

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