A reversible thermo-sensitive hydrogel clamper of locomotive mechanism in gastrointestinal tract

Jinseok Kim, Byungkyu Kim, Soohyun Kim, Hyeon Cheol Kim, Kukjin Chun

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We successfully demonstrate that a thermally actuated reversible hydrogel based clampers, the poly N-Isopropylacrylamide (PNIPAAm), holds the intestines of a pig during the inchworm motion of microrobot. Although there are no direct relationship between hydro affinity and friction force, we found the significant friction force difference according to the surface condition change of PNIPAAm hydrogel. On the small intestine of a pig, a clamping mechanism was realized based on simple switching hydrophobic / hydrophilic surface conditions of PNIPAAm due to heating / cooling. In order to estimate response time of the clamper, the characteristic transition time of PNIPAAm film from hydrophilic to hydrophobic condition was investigated. Water contact angle (WCA) was monitored to normalize the transition time characteristics of PNIPAAm film in the course of time. From these results, we calculated the minimum heating time of the various thickness of PNIPAAm film to the clamping after its change to the hydrophobic condition. The minimum heating time was 15 seconds until 1 mm thickness of PNIPAAm film had enough friction force.

Original languageEnglish
Title of host publicationTRANSDUCERS '05 - 13th International Conference on Solid-State Sensors and Actuators and Microsystems - Digest of Technical Papers
Pages749-752
Number of pages4
DOIs
Publication statusPublished - 2005
Event13th International Conference on Solid-State Sensors and Actuators and Microsystems, TRANSDUCERS '05 - Seoul, Korea, Republic of
Duration: 2005 Jun 52005 Jun 9

Publication series

NameDigest of Technical Papers - International Conference on Solid State Sensors and Actuators and Microsystems, TRANSDUCERS '05
Volume1

Other

Other13th International Conference on Solid-State Sensors and Actuators and Microsystems, TRANSDUCERS '05
CountryKorea, Republic of
CitySeoul
Period05/6/505/6/9

Keywords

  • Clamper
  • Gastrointestinal tract
  • Hydrogel
  • Thermo-sensitive

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Kim, J., Kim, B., Kim, S., Kim, H. C., & Chun, K. (2005). A reversible thermo-sensitive hydrogel clamper of locomotive mechanism in gastrointestinal tract. In TRANSDUCERS '05 - 13th International Conference on Solid-State Sensors and Actuators and Microsystems - Digest of Technical Papers (pp. 749-752). [2E4.74] (Digest of Technical Papers - International Conference on Solid State Sensors and Actuators and Microsystems, TRANSDUCERS '05; Vol. 1). https://doi.org/10.2514/1.9974