Category Archives: Prosthetics

Mind controlled prosthetic fingers

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Johns Hopkins researchers have developed a proof-of-concept for a prosthetic arm with fingers that, for the first time, can be controlled with a wearer’s thoughts.

The technology was tested on an epileptic patient who was not missing any limbs.  The researchers used brain mapping technology to bypass control of his arms and hands.  (The patient was already scheduled for a brain mapping procedure.) Brain electrical activity was measured for each finger.

This was an invasive procedure, which required implanting an array of 128 electrode sensors, on sheet of film, in the part of the brain that  controls hand and arm movement. Each sensor measured a circle of brain tissue 1 millimeter in diameter.

After compiling the motor and sensory data, the arm was programmed to allow the patient to move individual fingers based on which part of his brain was active.

The team said said that the prosthetic was initially 76 percent accurate, and when they combined the signals for the ring and pinkie fingers, accuracy increased to 88 percent.

Click to view Johns Hopkins video.


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Self-healing sensor improves “electronic skin”

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Hossam Haick and Technion colleagues are developing materials to be integrated into flexible electronics that mimic the healing properties of human skin.  The goal is to quickly repair incidental scratches or damaging cuts that might compromise device functionality. The synthetic polymer can “heal” electronic skin in one day, which can improve the materials used to achieve  a sense of touch in prosthetics.

The new sensor is comprised of a self-healing substrate, high conductivity electrodes, and molecularly modified gold nanoparticles.  The researchers noted that “the healing efficiency of this chemiresistor is so high that the sensor survived several cuttings at random positions.”

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Sensors allow more natural sense of touch in prosthetics

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Stanford’s Zhenan Bao is developing technology that could restore a more natural sense of touch in prosthetics.  Her flexible, thin plastic sensors send signals to the brain that more closely resemble nerve messages of human skin touch sensors.

The disruptive technology has not yet been tested on humans, and researchers still need to find a safe way to pass electrical signals from prostheses to the brain for long periods.

Many teams are working toward this (see ApplySci coverage from 2013-2015).   Previous tactile sensors have however been analogue devices, where more pressure produces a stronger electrical signal, rather than a more frequent stream of pulses. The electrical signals must then be sent to another processing chip that converts the strength of the signals to a digital stream of pulses that is only then sent on to peripheral nerves or brain tissue.  Bao’s sensors send digital signals directly.

Click to view Stanford University video.

WEARABLE TECH + DIGITAL HEALTH SAN FRANCISCO – APRIL 5, 2016 @ THE MISSION BAY CONFERENCE CENTER

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Biocompatible neural prosthetics

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Spinal injury patients, and those with lost limbs, sometimes have neural prosthetic devices implanted in an attempt to regain independence.  They are used for deep brain stimulation and brain controlled external prosthetics.  However, neural prosthetics are often rejected by the immune system, and can  fail because of a mismatch between soft brain tissue and rigid devices.

University of Pennsylvania‘s Mark Allen and colleagues have created an implantable neural prosthetic device that is biocompatible and replaces silicon and noble metal. The goal is to avoid immune-system rejection, failures due to tissue strain, neurodegeneration, and decreased fidelity of recorded neural signals.

“Lifelike” bionic hand for women and teenagers

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bebionic by steeper is a small,  “lifelike” bionic hand created for women and teenagers.  It is designed around an accurate skeletal structure with 337 mechanical parts.  Its 14  grip patterns and hand positions mimic real hand functions.

Its first user, Nicky Ashwell, was born with out a right hand.  After being fitted with the prosthetic, she was able to ride a bicycle and lift weights for the first time.

The prosthetic’s sensors are triggered by user muscle movements that connect to microprocessors and  motors in each finger. It weighs  1 pound and is 6.4 inches long.

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Intent controlled robotic arm with neuroprosthetic implant

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Caltech and Keck researchers implanted neuroprosthetics in a part of the brain that controls the intent to move, with the goal of producing more natural and fluid motions.   The study, published in Science, was led by Richard Andersen.  A quadriplegic implanted with the device was able to perform a fluid handshaking gesture and  play “rock, paper, scissors” using a separate robotic arm.

Andersen  and colleagues improved the versatility of movement that a neuroprosthetic can offer by recording signals from  the PPC brain region.  He said: “The PPC is earlier in the pathway (than the motor-cortex, a target of earlier neuroprosthetics,) so signals there are more related to movement planning—what you actually intend to do—rather than the details of the movement execution.  We hoped that the signals from the PPC would be easier for the patients to use, ultimately making the movement process more intuitive. Our future studies will investigate ways to combine the detailed motor cortex signals with more cognitive PPC signals to take advantage of each area’s specializations.”

WEARABLE TECH + DIGITAL HEALTH NYC 2015 – JUNE 30 @ NEW YORK ACADEMY OF SCIENCES.  REGISTER HERE.

Intent controlled prosthetic foot using myoelectric sensors

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Ossur‘s sensor implant allows amputees to control  bionic prosthetic limbs with their minds.  Myoelectric sensors are surgically placed in residual muscle tissue.  Prosthetic movement is triggered via a receiver.

Ossur’s existing “smart limbs”  are capable of real-time learning and automatically adjust to a user’s gait, speed and terrain.   However,  conscious thought is still required.

According to Thorvaldur Ingvarsson, the company’s R&D lead, “the (implant) technology allows the user’s experience with their prosthesis to become more intuitive and integrative. The result is the instantaneous physical movement of the prosthesis however the amputee intended. They no longer need to think about their movements because their unconscious reflexes are automatically converted into myoelectric impulses that control their Bionic prosthesis.”

WEARABLE TECH + DIGITAL HEALTH NYC 2015 – JUNE 30 @ NEW YORK ACADEMY OF SCIENCES.  REGISTER HERE.

Implant to enable prosthetic sensations

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Washington University‘s Daniel Moran has received a DARPA grant to test a device that would stimulate nerves in the upper arm and forearm of prosthetic users.  The goal is for the wearer to be able to feel hot, cold, and a sense of touch.  In a related development last year, MC10‘s Roozbeh Ghaffari developed artificial skin for prosthetics that mimics the sensitivity of real skin.  Its silicon and gold sensors detect pressure, moisture, heat and cold (see ApplySci, 12/30/14).

Moran’s electrode is designed to stimulate sensory nerve cells in the ulnar and median nerves in the arms. The ulnar nerve is the largest  in the body unprotected by muscle or bone and is connected to the ring finger and pinkie finger on the hand. The median nerve in the upper arm and shoulder is connected to the other fingers on the hand. Together, the two nerves control movement and sensations including touch, pressure, vibration, heat, cold and pain in all of the fingers.

This novel  macro-sieve peripheral nerve interface is designed to stimulate regeneration of the ulnar and median nerves to transmit information back into the central nervous system.

The device is in an early stage, and will only be implanted in non-human primates at this time.

WEARABLE TECH + DIGITAL HEALTH NYC 2015 – JUNE 30 @ NEW YORK ACADEMY OF SCIENCES.  

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App helps orthopedic surgeons plan procedures

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Tel Aviv based Voyant Health‘s TraumaCad Mobile app helps orthopedic surgeons plan operations and create result simulations.  The system offers modules for  hip, knee, deformity, pediatric, upper limb, spine, foot and ankle, and trauma surgery.  The iPad app mobile version of this decade old system was recently approved by the FDA.

Surgeons can securely import medical images from the cloud or hospital imaging systems to perform measurements, fix prostheses, simulate osteotomies, and visualize fracture reductions. The app overlays prosthesis templates on radiological images and includes tools for performing measurements on the image and positioning the template.  In total hip replacement surgery, it automatically aligns implants and assembles components to calculate leg length discrepancy and offset.

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Artificial skin detects pressure, moisture, heat, cold

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MC10‘s Roozbeh Ghaffari and a team of researchers from the US and Korea have developed artificial skin for prosthetics that mimics the sensitivity of real skin.  Its silicon and gold sensors detect pressure, moisture, heat and cold.   It is elastic enough for users to stretch and move a bionic hand’s fingers as they would real fingers.  According to Ghaffari, “If you have these sensors at high resolution across the finger, you can give the same tactile touch that the normal hand would convey to the brain.”  A paper detailing the research was published in Nature earlier this month.