Modulation of drug delivery rate by hydrogel-incorporating MEMS devices

Yuandong Gu, A. Baldi, B. Ziaie, Ronald A Siegel

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

12 Scopus citations

Abstract

We describe two approaches for modulating fluid flow and drug delivery rate in response to external stimuli using hydrogels incorporated in MEMS devices. The first design, a hydrogel-gated flow controller (HFC), consists of two components, a 3-dimensional crosscut structure and a loaded hydrogel. For a temperature-sensitive HFC, temperature cycling between 25 and 40°C results in a flow rate change between 0 and 12 ml/minute, with a 30 second response time. In the second design, a hydrogel-actuated microvalve (HAM) was constructed. In such a device, a hydrogel disc is sandwiched between a porous plate and a flexible silicone rubber membrane. Swelling of the hydrogel produced by diffusion of chemical species through the porous plate, resulting in the deflection of the membrane and closure of the valve intake orifice. A HAM loaded with phenylboronic acid (PBA)-based glucose-sensitive hydrogel was tested. This glucose-sensitive HAM opens and closes in response to changes in glucose concentration and pH. The fastest response time achieved was 16 minutes using a 70 μm thick hydrogel and a 60 μm porous back plate.

Original languageEnglish (US)
Title of host publication2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Proceedings
EditorsDavid Beebe, Andre Dittmar
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages406-409
Number of pages4
ISBN (Electronic)0780374800, 9780780374805
DOIs
StatePublished - Jan 1 2002
Event2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Madison, United States
Duration: May 2 2002May 4 2002

Publication series

Name2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Proceedings

Other

Other2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology
CountryUnited States
CityMadison
Period5/2/025/4/02

Keywords

  • Hydrogel
  • controlled drug delivery
  • microfluidics
  • phenylboronic acid

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