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Design of a microfabricated cell straining device for investigating cellular response to finite mechanical strains

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3 Author(s)

A methodology is presented for the design of a microfabricated blister-type device to examine the cellular response of isolated cells and multi-cellular aggregates to finite mechanical strains (1-5%):. The proposed device utilizes microfabrication technologies that incorporate the bonding, transfer, and assembly of thin (3 μm < thickness < 100 μm) elastic membranes onto rigid substrates with a circular hole or array of circular holes in the formation of diaphragm structures. An analysis of membrane deformations and strain fields of macro- and micro-scale polydimethylsiloxane (PDMS) diaphragm, blister-type devices demonstrates that microfabricated diaphragms can achieve finite strains corresponding to smaller axial displacements than those required for identical strains in macro-scale devices. Smaller axial displacements may decrease the confounding shear loading of the cell culture by the overlying nutrient medium. Additionally, it is shown that the uniform residual stress of a microfabricated diaphragm can be experimentally determined and utilized for more precise control of the incremental finite strains imposed on the diaphragm. Thus, microfabricated blister-type cell straining devices may potentially enhance future quantitative investigations of dynamic mechanically stimulated cell culture

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Microtechnologies in Medicine &amp; Biology 2nd Annual International IEEE-EMB Special Topic Conference on

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