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Can You Knit a Heart?

Can You Knit a Heart?

Using a super-elastic metal known as nitinol and a traditional Bolivian knitting technique, cardiologist Franz Freudenthal has developed a hand-stitched patch to close a hole in the heart. Nitinol, a nickel-titanium alloy, reacts to temperature fluctuations by changing its shape. The cooled patch is folded and grafted into place using a catheter. Once it warms up to  body temperature, it recovers its original shape and then blocks the hole in the heart.

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