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Magnetic biomedical devices can pop into shape as needed

What's New? | April 24, 2023 | By:

As MaSoChain instruments are pushed out of a catheter, magnets within their segments cause them to take on predetermined shapes. Photo: ETH Zurich / Nicole Davidson.

One of the challenges of minimally invasive laparoscopic surgery lies in getting surgical instruments into the patient’s body via a narrow catheter. Scientists have set about addressing that problem with magnetic instruments that pop into and out of shape as needed. The experimental MaSoChain (magnetic soft-robotic chain) system was developed at Switzerland’s ETH Zurich research institute by a team led by doctoral student Hongri Gu, now post-doctoral at the University of Konstanz.

MaSoChain incorporates 3D-printed surgical instruments made up of small rigid polymer segments linked by flexible elastic connectors. Each segment has a tiny strategically placed magnet inside. When inserted into a catheter, the components all sit end-to-end in a row, like a string of pearls. As the instrument is pushed out of the end of the catheter, its magnets are drawn to one another, causing it to take on the desired shape, which is wider than the catheter. 

The technology has been used to create a grasper that can grab and move items within the body, and a three-piece steerable endoscopic camera, among other functionalities. Once the surgical task is complete, the instrument’s components revert to their narrow “string-of-pearls” configuration as they’re pulled back out through the catheter. The whole setup can then be sterilized and reused.

The research is described in a paper published in the journal Nature Communications

Source: ETH Zurich

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