Original title: A Multi-Vine Soft Robot Enabling Accessible Working Channel and Steering
Reza Kashef, Cem Suulker, Mohammad Sheikh Sofla, Kaspar Althoefer · September 2026
Navigating tight, curved spaces like the human colon is difficult for medical robots. Soft vine robotsSoft, flexible tubes that grow by everting from the tip when pressurized, enabling navigation in confined spaces. grow forward from their tips when pumped with pressure, moving with minimal friction. However, sharp turns can stop them from growing, and putting tool channels inside their soft bodies limits tool size and causes friction. To solve this, researchers built a system that connects two vine robots together. Instead of putting a tool channel inside the robots, they placed it on the outside, linked by soft mounting tips. The two vines can grow independently, which allows the robot to actively steer its tip while advancing the external channel alongside it. In their tests, the researchers showed that this new design can steer sharply by nearly 90 degrees while it grows. This allows tools to travel through tight turns without getting trapped inside the robot body.
Imagine trying to thread a long, floppy garden hose through a cluttered basement to reach a leaky pipe. The hose keeps getting caught on furniture, and when you try to turn a corner, it kinks and blocks the flow of water. In this paper, the vine robots are like the hose growing through tight spaces, but sharp turns make them hard to steer. The multi-vine design uses two growing tubes to control direction, while the working channel is kept separate so tools can pass through without getting stuck in the growth process.
Doctors performing minimally invasive procedures could navigate tricky body areas like the colon more effectively, delivering tools without friction or size limits that previously hindered access.
The abstract does not specify limitations, but it notes that experiments demonstrate sharp steering, likely in controlled environments. Further testing in real medical scenarios and long-term reliability are not addressed.
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A Multi-Vine Soft Robot Enabling Accessible Working Channel and Steering — Reza Kashef, Cem Suulker, Mohammad Sheikh Sofla et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.