TUG: the delivery robot that carried drugs and meals down hospital corridors

A $105,000 hospital courier

Aethon was founded in Pittsburgh in 2001 by Henry Thorne, a graduate of the Carnegie Mellon Robotics Institute. TUG went commercial in 2004. It is an autonomous robot that delivers and tracks medications, meals, linens, lab specimens and supplies inside hospitals. Along the way it spoke prompts such as “Waiting to proceed.” In 2008 it cost $105,000 to buy or $1,500 a month to lease, and four lead-acid batteries gave it six hours of operation.

From 100 hospitals to 150, then an acquisition

In 2008 TUG was used in more than 100 hospitals. In 2010 Aethon raised $6.6 million in a round led by Robert Bosch Venture Capital. According to a 2014 company release, it was installed at 21 new hospitals in 2013, and over 400 TUG robots in U.S. hospitals were making upwards of 50,000 deliveries a week. In July 2017 ST Engineering agreed to acquire Aethon at an enterprise value of about $36 million, and Aethon continued to operate from Pittsburgh. In December 2021 ST Engineering posted a video of TUG robots deployed at Kwong Wai Shiu Hospital. As of October 2026 the Aethon site shows T3, T3 XL, Zena Rx and others, and does not use the TUG name.

Helpful, and kind of a pain

In 2016 UCSF’s Mission Bay hospitals in San Francisco ran 27 Tugs. Each travelled about 35 miles a day, and together they made more than 157,000 trips in a year. The program cost about $6 million including infrastructure changes, and UCSF hired about 30 fewer workers than it otherwise would have. Mardi Thompson, a neonatal intensive care nurse, said: “I think they’re helpful. I think they’re also kind of a pain.” At the University of Wisconsin, Bilge Mutlu’s ethnographic study of an Aethon delivery robot in a hospital won Best Paper at the HRI conference, and Aethon used the findings to improve the robot.

It took over the walking, not the talking

TUG did not converse or show emotion. It took over the carrying that hospital staff used to do on foot. It is worth comparing with Diligent’s Moxi, which also handles hospital logistics. With dozens running in one hospital, it also affected hiring.

Who gets the work this robot removes, and who gets the work it creates?

What we haven’t confirmed

• TUG’s size and weight
• Whether the TUG name was formally changed or the robot discontinued, and when
• The total number of units ever deployed
• The difference in the reported deal value ($36 million vs. “50 mil” in a headline, currency unclear)