Archives for category: sensors



What if there was a device which allowed amputees to feel their limbs again?

The loss of a limb or damage of the nerves that travel through our bodies can greatly diminish the human experience. The sensory system dictates how we respond to our environment, transmitting signals to and from our brains so we can move and feel. Pain, pressure, and temperature response are just some of the functions of the somatosensory system connected to our skin, allowing us to experience the world. In addition, our nerves have a motor component, sending signals from the brain to our muscles, telling them to work so we can move and perform tasks.

Nerves function much like electrical wires, transmitting signals between the brain and areas of stimulus, like an electrical wire between a socket and device. It is this electrical current which causes signals to be transmitted. After an amputation, the nerve is severed, not only disrupting the flow of a nerve signal, but also sometimes leaving amputees with a cruel phantom limb pain, as if the limb was still there. For those with limbs still intact who suffer from nerve damage, the physical limb remains, but its function is diminished without the motor and sensory signals being transmitted.

SENSY by Sensars is almost unbelievable in the amazing feat that it has sought to achieve, allowing amputees and those with nerve damage to feel again. Artificial sensors are implanted to connect to intact nerves, stimulating response in the brain as if there was an intact nerve in a limb. The sensors are connect to wires simulating an actual nerve, and those wires are implanted and connected to actual nerves within the body. Between the artificial sensors  and the residual nerve is an implantable neurostimulator which is bidirectional, sending and receiving signals from both the intact nerve and the artificial sensors.

The versatility of SENSY is also amazing. The company has a multi-functional product which targets both amputees and those with intact limbs who have nerve damage. There are 3 options, but the flow of information is essentially the same. A sensor (either from artificial skin, glove/sock, or “pacemaker”) sends a signal to a controller which is able to activate that signal to an implantable neurostimulator, which causes an electrical signal to communicate with the intact nerve. Once that communication is made, the connection is made between the artificial and biological part of the nervous system, and feeling is processed in the brain.

For amputees, Sensar has sought to decrease phantom limb pain and increase sensory feedback through sensors with a neuroprosthetic device which includes artificial skin. As we know, skin is very sensitive, and in this case will contain sensors which will prompt the prosthetic device to send signal through the artificial nervous system.

For those with intact limbs. the company is designing socks and gloves for those with upper and lower limb nerve damage. These socks and gloves contain sensors within the fabric which act essentially as sensitized skin, also sending signals to an implanted device which communicates with the intact nerves.

Finally, for those with an amputation but without prosthesis, the company has created an implantable pacemaker, essentially an excitable device like a sensor which also sends a signal to the nerve.

Go to the website to read about the full and brilliant description of this product, and watch the video for a visualization of how the artificial sensors are able to communicate with an intact nerve.Still in the prototype phase and not yet available for sale, SENSY will truly impact people’s lives once it is on the market.





One of the most exciting aspects of current robotics is the amenability and exchange of ideas that can occur with a single product. Both the remarkable ideas and communities that are created are very exciting.  I discussed this previously, specifically for open source 3D printing in prosthetics for the 3-D Heals community.

But, what if an intelligent arm could be programmed to carry out a wide array of tasks? KATIA from Carbon Robotics is designed for just this, to be to a functional, affordable robot with an open platform to allow versatility. The company has 3D printing and a camera as functions in mind, but is opening up its creator space to the community to give the intelligent arm more functions.

KATIA is, according to the site, ‘Kickass, Trainable, and Intelligent.’ The trainability is a very unique feature, as it appears that once the arm is guided through a motion, it can recall the same motion with ease. Designed with motion sensors and attachments in mind, the possibilities of KATIA are great, with possibly huge implications for those needing extra assistance in daily tasks.

Go to the site for updates with this project, and contribute ideas if you are a developer that would like to take part of its growth.

More details in the video below:


Silver nanowire sensors hold promise for prosthetics, robotics


As wearable technology progresses, monitoring activity using these devices will require more accuracy as the user interacts with the environment. From fitness trackers to prosthetics, a wearable robotic device is extremely useful if its user is able to interact and gain feedback from its use. At North Carolina State University, researchers developed a silver-based nanowire sensor to monitor changes in pressure, finger touch, strain, and bioelectronic changes. As described in the study, the sensor involves a material placed between two conductors. The silver wires are the conductors, while the material in the middle is Ecoflex silicone and serves as the electric insulator. These sensors are moveable, stretchable, and respond to pressure changes in real time, within 40 milliseconds. Between these two layers an electric charge is stored, and as the sensor is stretched or deformed in any way, this change is interpreted as energy and measured.

The movements which these sensors are able to detect are walking, running, and jumping from squatting. For use in robotics devices such as exoskeletons and prosthetics, this information will become invaluable as the user will need this information in order to interact with the environment for safety and feedback purposes. The sensors can be used to ‘feel’ the environment, as well as to monitor movement and activity. For those with robotic prosthetic devices, these sensors can be used to provide important feedback to retrain the body and provide kinesthetic feedback.

One of the unique attributes of these sensors is their ability to deform and change shape with movement, as they can stretch up to 150% of their original shape.