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Liquid seal for compact micropiston actuation at the capillary tip.

ABSTRACT: Actuators at the tip of a submillimetric catheter could facilitate in vivo interventional procedures at cellular scales by enabling tissue biopsy and manipulation or supporting active micro-optics. However, the dominance of frictional forces at this scale makes classical mechanism problematic. Here, we report the design of a microscale piston, with a maximum dimension of 150 ?m, fabricated with two-photon lithography onto the tip of 140-?m-diameter capillaries. An oil drop method is used to create a seal between the piston and the cylinder that prevents any leakage below 185-mbar pressure difference while providing lubricated friction between moving parts. This piston generates forces that increase linearly with pressure up to 130 ?N without breaking the liquid seal. The practical value of the design is demonstrated with its integration with a microgripper that can grasp, move, and release 50-?m microspheres. Such a mechanism opens the way to micrometer-size catheter actuation.

SUBMITTER: Barbot A

PROVIDER: S-EPMC7253165 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Liquid seal for compact micropiston actuation at the capillary tip.

Barbot Antoine A Power Maura M Seichepine Florent F Yang Guang-Zhong GZ

Science advances 20200527 22

Actuators at the tip of a submillimetric catheter could facilitate in vivo interventional procedures at cellular scales by enabling tissue biopsy and manipulation or supporting active micro-optics. However, the dominance of frictional forces at this scale makes classical mechanism problematic. Here, we report the design of a microscale piston, with a maximum dimension of 150 μm, fabricated with two-photon lithography onto the tip of 140-μm-diameter capillaries. An oil drop method is used to crea ...[more]

PMID: 32518828

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