The Smart Knee is a low power wearable for up to three months of continuous monitoring of knee use and recovery .
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We have development kits in stock now and can fulfill orders within a few days. The kits can be purchased by anyone with an interest in building on our exciting platform!
The Smart Knee is the only knee tracking technology that can continuously monitor knee angle and body position for months at a time without being charged. Since there is nothing to charge, user compliance in wearing the device remains extremely high. This opens the door to a whole new class of patient monitoring products and research studies that were formerly not possible.
When a patient leaves the clinic or research lab, their lives turn into a black box. The Smart Knee tracks the ROM and count of every knee bend, so not a single knee motion goes unnoticed. By tracking body position (via the onboard triaxial accelerometer), a very clear picture of how an individual is using their knee is obtained. The Smart Knee will take the mystery out of research, patient compliance during recovery and empower future patients and healthcare providers with the information they need to make the right decisions.
Every Smart Knee development kit comes with at least one Smart Knee, a set of reusable skin pads (2 sets total), enough medical adhesive tape for 10 applications, and access to the Smart Knee app and API. We also include a Nexus 6p smartphone to ensure you have the best experience. Kits with one, two and ten Smart Knees can be purchased here
We will warranty the device to be free of manufacturing defects and normal use for two months after purchase, and will provide limited customer support in the event a unit malfunctions. We do not have the bandwidth to provide extensive support for customers in all their applications, but will provide support via email and our knowledge base depending on the package you choose.
The Smart Knee is based on an entirely new sensing technology (soft capacitive angular displacement sensors). Unlike IMU based products, there is no drift or large power consumption, which means you get an accurate and reliable knee angle in a unit that never has to be charged by the user. Since the sensors are based on angular displacement, erroneous kinking or bending won’t introduce an error, which is something that conventional sensors based on resistance are prone too.
By using a 2-axis sensor, we have created the most versatile device possible. Using a single axis of this sensor has proven sufficient for most applications that need to measure flexion/extension of the knee. However, the two axes can be fused,providing a more accurate knee angle measurement in the event of large skin motion or placement into a fabric sleeve for applications where medical adhesive tape is not appropriate. Furthermore, having a 2-axis sensor opens the door to using the device on other joints such as the wrist, ankle, back and other joints that have multiple degrees of freedom.
Currently we’re supporting Android only. The phones we support are Nexus 5 & 6, Samsung Galaxy S4, S5 & S6. We support Android 4.4 or newer but recommend Android 5.0 or newer for the best experience. If you don’t have one of the phones listed you can purchase one of our kits that come with an unlocked version of the Nexus 5.
Although our initial application of this technology is aimed at the knee, other joints could be monitored, including the ankle, wrist, elbow, back, neck and others. Purchase a development kit and try it out!
The precision of the joint angle data is three degrees, with virtually no noise seen on the signal. The device can sense +/- 360 degrees of bending. In order to save power, the device samples at 20 Hz, which is sufficient for most normal daily activities. Higher performance units with higher sample rates are available for high speed athletics and research studies upon request.
The Smart Knee is the first device of it’s kind and will enable a new class of long term studies focused on knee recovery that were previously not possible. Because subjects can comfortably wear the device over long periods of time, researchers can now get access to accurate movement data that were previously inaccessible. It’s also feasible to remotely check in on patient data without the subject needing to be physically present.
The Smart Knee is the perfect device for at home use by knee patients. It’s comfortable, accurate and connected allowing patients and clinicians to discover in real time how a patient is progressing. Bend Labs has focused on developing the hardware platform(hardware and API), but we don’t have plans to develop consumer facing software and services for medical use. The Smart Knee offers a truly unique solution in a space where all other options require the user to periodically charge their device or make inaccurate measurements and assumptions. We have found this combination to be the primary cause of poor long term compliance.
Currently, this is classified as a research device and is not registered with the FDA. For most research applications, this shouldn’t pose a problem. If your end use application requires regulatory filings, we will work with you to ensure that your product complies with all regulations and standards.
We're working tirelessly to ship Smart Knees to a growing list of companies and research institutions for remote orthopedic monitoring and research applications. Click here to purchase your Smart Knee kit. Add your email below for company updates.