One of the most significant challenges in treating battlefield injuries is finding and stopping severe bleeding in the torso, a condition known as non-compressible torso hemorrhage. Limitations in frontline medical facilities mean that many warfighters die from injuries that could be survivable with more immediate surgical care.

DARPA's new Medics Autonomously Stopping Hemorrhage program, known as MASH, aims to use robots-guided by advanced sensors and equipped with artificial intelligence-to locate and stop severe bleeding in the torso with only limited direct human assistance.

"We owe it to our warfighters to give them the best possible chance of survival," said Dr. Adam Willis, MASH program manager. "In large-scale conflicts, many warfighters die from injuries that could be survivable if they could get to a surgeon quickly."

The autonomous systems under development could stabilize injured warfighters for 48 hours or more, providing crucial time for evacuation to hospitals for definitive care.

"The real challenge is finding that bleed," Willis said. "Imagine navigating a complex landscape of organs and blood inside the torso to find the exact spot that needs attention."

DARPA's challenge lies in developing autonomous software that can leverage existing medical devices to provide medics with precise, real-time guidance under extreme battlefield conditions, and automated capabilities to stabilize lethal hemorrhage within the torso.

"It's like developing a GPS for the inside of the human body to position existing tools to precisely stop the bleed, under extreme circumstances," Willis added.

The system aims to offer a simplified user experience in pre-hospital settings, similar to external defibrillators used to restart the heart following sudden cardiac arrest.

MASH is structured as a three-year program conducted in two phases: integrating sensors with robotic systems to find bleeding, then developing software and autonomy to stop the bleeding. The program aims to advance both robotic surgery technology and trauma procedures specifically designed for robotic intervention.

Researchers interested in learning more and/or submitting to the program are invited to a proposers day on Thursday, Sept. 18, 2025, by webcast for remote participation. Details on registration are available on SAM.gov. Potential proposers seeking additional information and upcoming announcements may email at [email protected].

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All media inquiries should be directed to DARPA Public Affairs.