science tech engineering materials electronics medical_devices wearable_technology soft_robots robotics

Sewing Machine Makes Cheap Stretchy Component Needed For Wearable Tech And Soft Robots

Purdue University engineers have come up with a new and simpler way to make stretchy connections for electronics. Such power- and information-transporting materials are needed for soft robotics, next-generation implants and wearable technologies to advance.

The group used a regular sewing machine to sew a wire in a zigzag pattern on a sheet of the plastic PET with water-soluble thread. A stretchy, rubbery polymer was poured over the wire and water was then used to dissolve the thread. The PET was pulled away after the thread dissolved and released it from the wire, which was now embedded in the rubbery polymer. 

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Something To Smile About: Laser Replaces Dental Drill

by Peter Gwynne, Inside Science

Many patients regard the dental office as a house of pain – a place to be endured, with literally a stiff upper lip, when they can’t avoid it. But a few dentists have started to soften that image by using a laser rather than the fearsome drill for such procedures as removing tooth decay and filling cavities.

Cleared for dentistry use last year by the Food and Drug Administration and reaching the market in December, the carbon dioxide laser produces rapid pulses of infrared light at a wavelength that the teeth absorb particularly well.

Early adopters have applauded it. “It’s quite remarkable,” said Boston-based dentist Mark Mizner, who has used it to treat 100 to 150 patients by his estimate. “It cuts cleanly, and it cuts decay as easily as it cuts through the healthy tooth. It also cuts soft tissue like nothing I’ve ever used before.”

Added University of California, San Francisco School of Dentistry dean John Featherstone, whose research laid the foundations of the laser’s dental capabilities: “It’s a quantum leap forward in terms of dentistry.”

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A Boring Idea: Fig Wasp Physiology Could Mean Better Surgical Tools

by Michael Keller

Future surgeries requiring a doctor to dive deep into the body might be made considerably less invasive thanks to an unlikely inspiration: a parasitic fig wasp.

Mechanical engineers at the Indian Institute of Science have been investigating the reproductive process of Apocryta westwoodi grandi, a wasp that deposits its eggs inside a developing fig fruit next to those of another species of wasp. When the eggs hatch, they feed on the larvae of the non-parasitizing wasp before growing and emerging into the world.

While the interactions of the two wasp species and the plant are biologically interesting in their own right, the part that caught the eyes of researchers in Namrata Gundiah’s biomechanics laboratory was how the parasitic wasp deposited its eggs deep within the fruit.

Like many insects and some other animals, the parasitic wasp deposits its eggs through a long tubular organ called an ovipositor. But this particular wasp must pierce the skin and bore through the tough tissue of an unripened fig.

“From a mechanical perspective, it’s really interesting how this insect can penetrate a needle that is really quite flexible into hard material,” doctoral student Lakshminath Kundanati tells Txchnologist. “So we looked at the structure of the needle and whether any parts on it are specifically adapted to help.”

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Could New Wireless Power Transfer Unleash Electric Medicine?

Stanford University engineers say they have figured out a way to wirelessly send electric power deeper into the body than ever before.

Inventor and electrical engineering assistant professor Ada Poon created a near-field power transmitter like those used to recharge wireless toothbrushes in their cradle. The difference is that hers uses tissue between the transmitter and medical device implanted in the body to amplify the electromagnetic waves. Her team then created an electrode and receiver unit about the size of a grain of rice that can be placed wherever electrical stimulation is required.

Read more and see the video below.

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