July 27, 2020

Augmented reality tool shown to help surgeons remotely guide first responders in battlefield-like scenarios

Note to journalists: The paper is available online open-access. Photos and video of first responders using this augmented reality tool in war zone simulations are available in a Google Drive folder. Journalists visiting campus should follow visitor health guidelines.

wachs-surgery In a smoke-filled room, a first responder receives instructions from a surgeon through an augmented reality headset to perform an operation. (Purdue University photo/Edgar Rojas Muñoz) Download image

WEST LAFAYETTE, Ind. — War zones can be too far from operating rooms, preventing soldiers from receiving the surgery they need fast enough.

A Purdue University-led study is the first to show medics successfully performing surgery in life-like simulations of these war zones by receiving guidance from surgeons through an augmented reality headset. The work is joint with Purdue's School of Industrial Engineering and the Department of Computer Science.

The headset transmits a recorded view of the operating site to the surgeon, who can then use a large-display touch screen to mark up the recording with drawings of how to complete the surgical procedure. Augmented reality helps the first responder see the surgeon’s annotated instructions directly on their view of the operating field.

Researchers at Purdue and the Indiana University School of Medicine have been developing this technology, called System for Telementoring with Augmented Reality (STAR), since 2015.

Operating rooms across the U.S. have already started using augmented reality telementoring to virtually bring in the expertise of other surgeons on how to use a new instrument or better perform a particular procedure.

But this technology hasn’t made it to “austere” settings, such as a battlefield or forest thousands of miles away from a hospital, where a first responder could be treating injuries far too complex for their level of expertise, said Juan Wachs, Purdue University’s James A. and Sharon M. Tompkins Rising Star Associate Professor of Industrial Engineering.

“Augmented reality telementoring doesn’t usually operate well in extreme scenarios. Too much smoke can prevent visual sensors from working, for example,” Wachs said.

Researchers from Purdue and the IU School of Medicine tested STAR with first responders and surgeons at the Naval Medical Center Portsmouth in Virginia. The work is published in NPJ Digital Medicine, a Nature Research Journal.

The study evaluated first responders using STAR to perform on a patient simulator a common procedure that opens up a blocked airway, called a cricothyroidotomy. Even the responders with no or little experience performing this procedure prior to the study successfully operated after receiving instructions from surgeons through STAR.

The simulations took place both indoors and outdoors, including smoke and sounds of gunshots, explosions and helicopters. The researchers found that first responders more successfully performed the cricothyroidotomies with STAR than with just hearing a surgeon’s voice for each of these scenarios. If smoke made the visualization too unreliable, the responders could still do the operation when STAR automatically switched to audio-only telementoring.

STAR would need more durable materials before it’s used on a real battlefield, Wachs said, but the software is now proven to work in extreme conditions.

Wachs has recently formed a company, AI-Medic, that is working on artificial intelligence solutions to address communication disruptions that might occur while using augmented reality telementoring systems in the field.

STAR is protected by patents filed through the Purdue Research Foundation Office of Technology Commercialization. This study was financially supported by Office of the Assistant Secretary of Defense for Health Affairs (Award No. W81XWH-14-1-0042) and the National Science Foundation (Grant DGE-1333468).

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Writer, Media contact: Kayla Wiles, wiles5@purdue.edu (working remotely, but will provide immediate response)

Sources:

Juan Wachs, jpwachs@purdue.edu

Edgar Rojas-Muñoz, emuoz@purdue.edu

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ABSTRACT

Evaluation of an augmented reality platform for austere surgical telementoring: a randomized controlled crossover study in cricothyroidotomies

Edgar Rojas-Muñoz1, Chengyuan Lin 2, Natalia Sanchez-Tamayo1, Maria Eugenia Cabrera3, Daniel Andersen 2, Voicu Popescu2,

Juan Antonio Barragan1, Ben Zarzaur4, Patrick Murphy4, Kathryn Anderson4, Thomas Douglas5, Clare Griffis5, Jessica McKee6,

Andrew W. Kirkpatrick6,7,8 and Juan P. Wachs 1,4

1School of Industrial Engineering, Purdue University, West Lafayette, IN, USA. 2Department of Computer Science, Purdue University, West Lafayette, IN, USA.

3Paul G. Allen School of Computer Science and Engineering, University of Washington, Seattle, WA, USA.

4Department of Surgery, School of Medicine, Indiana University, Indianapolis, IN, USA.

5Naval Medical Center Portsmouth, Portsmouth, VA, USA.

6Department of Surgery, and the Regional Trauma Services, University of Calgary, Calgary, AB, Canada.

7Department of Critical Care Medicine, University of Calgary, Calgary, AB, Canada. 8Canadian Forces Medical Services, Ottawa, ON, Canada.

DOI: 10.1038/s41746-020-0284-9

Telementoring platforms can help transfer surgical expertise remotely. However, most telementoring platforms are not designed to assist in austere, pre-hospital settings. This paper evaluates the system for telementoring with augmented reality (STAR), a portable and self-contained telementoring platform based on an augmented reality head-mounted display (ARHMD). The system is designed to assist in austere scenarios: a stabilized first-person view of the operating field is sent to a remote expert, who creates surgical instructions that a local first responder wearing the ARHMD can visualize as three-dimensional models projected onto the patient’s body. Our hypothesis evaluated whether remote guidance with STAR could lead to performing a surgical procedure better, as opposed to remote audio-only guidance. Remote expert surgeons guided first responders through training cricothyroidotomies in a simulated austere scenario, and on-site surgeons evaluated the participants using standardized evaluation tools. The evaluation comprehended completion time and technique performance of specific cricothyroidotomy steps. The analyses were also performed considering the participants’ years of experience as first responders, and their experience performing cricothyroidotomies. A linear mixed model analysis showed that using STAR was associated with higher procedural and non-procedural scores, and overall better performance. Additionally, a binary logistic regression analysis showed that using STAR was associated to safer and more successful executions of cricothyroidotomies. This work demonstrates that remote mentors can use STAR to provide first responders with guidance and surgical knowledge, and represents a first step towards the adoption of ARHMDs to convey clinical expertise remotely in austere scenarios.

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