The Varus-Valgus-Verifier: V3
Increasing efficacy one trial at a time.
Striving Forward
Our team is constantly working towards improving quality of life for every individual that can be reached by the works we improve with our novel efficacy verification.
Introduction
QuantiPedics is focused on quantifying the effectiveness of Össur's knee braces by measuring the medial and lateral forces in the knee throughout flexion and various varus valgus alignments. As there are no test devices available on the market that model this situation, our goal is to develop this test device; knowledge gained from these tests will help alleviate unnecessary pain from those affected by osteoarthritis within the knee. This project has presented many design and manufacturing challenges; utilizing the diverse background and expertise of our team members, we have steadily approached that goal through multiple research, design, and prototype phases
Functionality: Motion
QuantiPedics prides itself on its effective and simplistic mechanical systems. As a company we work towards creating solutions that are sleek, easily adjusted, and complete their goal seamlessly.
Varus, Valgus, & Flexion
Utilizing a system of pins along the base plate of the feature we are able to achieve a full discrete range of flexion in the knee and varus valgus angles. As seen in the image above there are two pin mechanisms in place to ensure functionality and hard stops between each degree point. The first set of pins in the base plate itself allow for adjustable amounts of varus or valgus flexion within the knee by angling the base ankle mount. The second set of pins rely on the arc fixture on the end of the plate as seen to the left. This arc fixture allows for a hard stop at any of the discrete angles of knee flexion. These two methods allow for not only a precise measurement of the varus valgus angles being affected, but for singular point flexion testing.
Knee Backing
The design was developed due to the need to have a flexible, durable and shape retaining knee backing. Throughout the design process the selected concept, a laser cut wooden sheet, was discovered and developed. The patterns within the wood, cut by the laser, allow for different degrees of flexion all while retaining the strength of the backing. Considering the other options for this backing, wood has the most durable standing as we are unable to develop a metal equivalent that wouldn't lead to errosion or be too brittle for the cyclical testing required. The backing of the knee is a laser cut wooden plank that in effect is flexible enough to endure cyclical testing while fixing the pivotal problem of the open back of the knee.
Functionality: Ankle
A unique feature of QuantiPedics V3 is the placement of all adjustable features. All adjustable features and measuring equipment are within the ankle. This allows for easy access to all components necessary to run and maintanence in between and during trials. This novel approach reduces the hassle of adjusting in between trials and keeping the equipment up to date.
Futek Force Sensors
Futek produces small sensitive sensors that allow us to record compressive and tensive forces exerted by the knee brace. There are two sensors on the ankle of V3
Ankle
The ankle contains multiple components pivotal to the performance of the overall equipment. The ankle is mobile on two tracks that allow for flexibility. Springs connected to the main ankle cartliage act as the "ligaments" of the system. Without the springs there would be no resistance to the directional changes in the knee. The springs compress and stress the nearby Futek sensors. Working together these components allow QuantiPedics to measure the forces exerted on the knee by the knee brace.