Evidence map›Paper›PMID 34193416›Full record

ArticleScience advances2021

Soft-bodied adaptive multimodal locomotion strategies in fluid-filled confined spaces.

Ziyu Ren, Rongjing Zhang, Ren Hao Soon, Zemin Liu, Wenqi Hu, Patrick R Onck, Metin Sitti

Abstract read
In one paragraph

Article in Science advances, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 63 papers.

0numbers the graph read from it
0cells of the map it votes in
63citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

63 citing papers in PubMed.

  1. Habitat-Specific Design Strategies for Untethered Soft Robots.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026
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  19. Stable magnetic soft structures.Science advances · 2025
    Article
  20. Article

3 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Ziyu RenPhysical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany.ORCID http://orcid.org/0000-0003-0824-1805
Rongjing ZhangZernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, Netherlands.
Ren Hao SoonPhysical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany.ORCID http://orcid.org/0000-0003-4188-540X
Zemin LiuPhysical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany.ORCID http://orcid.org/0000-0002-9211-6603
Wenqi HuPhysical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany. wenqi@is.mpg.de p.r.onck@rug.nl sitti@is.mpg.de.ORCID http://orcid.org/0000-0002-3457-821X
Patrick R OnckZernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, Netherlands. wenqi@is.mpg.de p.r.onck@rug.nl sitti@is.mpg.de.ORCID http://orcid.org/0000-0001-5632-9727
Metin SittiPhysical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany. wenqi@is.mpg.de p.r.onck@rug.nl sitti@is.mpg.de.ORCID http://orcid.org/0000-0001-8249-3854

Funding

European Research Council 834531
6 · The paper itself

Abstract

Soft-bodied locomotion in fluid-filled confined spaces is critical for future wireless medical robots operating inside vessels, tubes, channels, and cavities of the human body, which are filled with stagnant or flowing biological fluids. However, the active soft-bodied locomotion is challenging to achieve when the robot size is comparable with the cross-sectional dimension of these confined spaces. Here, we propose various control and performance enhancement strategies to let the sheet-shaped soft millirobots achieve multimodal locomotion, including rolling, undulatory crawling, undulatory swimming, and helical surface crawling depending on different fluid-filled confined environments. With these locomotion modes, the sheet-shaped soft robot can navigate through straight or bent gaps with varying sizes, tortuous channels, and tubes with a flowing fluid inside. Such soft robot design along with its control and performance enhancement strategies are promising to be applied in future wireless soft medical robots inside various fluid-filled tight regions of the human body.

Identifiers

PMID34193416
PMCPMC8245043

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.