Suction cup holder for transferring grafts and biosensors. Free Technical Library News

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Suction cup holder for transferring grafts and biosensors

29.10.2020

Thin tissue grafts and flexible electronics today find many applications in medicine. But transferring them from a nutrient medium in a Petri dish to a patient is not an easy task. With which a new device, created like an octopus sucker, can now handle. It quickly transfers delicate tissues or thin electronic sheets to the patient without damaging them.

The new device was developed by scientists at the University of Illinois (USA).

"During the operation, surgeons must minimize the risk of soft tissue injury and quickly transplant the graft without contamination. In addition, the transfer of ultra-thin materials without wrinkling or damage is another important aspect," said study leader Hyunjun Kong, professor of chemical and biomolecular engineering.

Looking for a way to quickly assemble and move thin, delicate sheets of cells or electronics without damaging them, researchers turned to the animal kingdom for inspiration. The natural model for their device was the octopus suckers, with the help of which the mollusk can pick up both wet and dry objects of any shape. In this case, objects are held only by muscular effort, and not by sticky chemical glue.

Scientists have developed a holder made from a temperature-sensitive layer of soft hydrogel attached to an electric heater. To take a thin sheet, the researchers gently heat the hydrogel, causing it to shrink, then press it against the sheet and turn off the heat. The hydrogel expands slightly, "sucking up" soft tissue or flexible electronic film. Then, with the help of a holder, the thin film is carefully moved onto the "target" and the heater is turned on again, compressing the hydrogel and releasing the film.

The whole process takes about 10 seconds.

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