# Title Team Members TA Documents Sponsor
58 Orthopedic Chair
Alex Shen
Emre Ulusoy
Pablo Corral Vila
Kexin Hui design_review
Bad posture is a serious issue that is prevalent in society. It feels natural to hunch over when doing work, studying, or even playing games. Along with this, bad posture is exhibited while sitting. Since these bad poses may happen subconsciously, it may be helpful to know when bad posture is being used.

Our project idea is to build a couch/chair that provides orthopedic feedback to the user. We spend a great portion of our day sitting down whether it be for work or leisure time. We figured that we might as well create some sort of system that informs the user of posture habits and potential orthopedic hazards. Our idea is in its preliminary stages, so we are open to further developing our scope for the project. The chair will be embedded with pressure sensors on its seat and its back. The pressure readings from the glutes, lumbar and upper back will be used to evaluate the posture of the user. Along with this, we can mount a range sensor on the back of the chair to measure the distance between the user and the back since slouching tends to increase that distance. Our project is an innovation, and the most similar thing we could find is a product called Axia Smart Chair. It is a chair that provides the user “direct feedback by means of a vibration signal in the seat cushion and a personal App”.

Recovery-Monitoring Knee Brace

Dong Hyun Lee, Jong Yoon Lee, Dennis Ryu

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Thanks to modern technology, it is easy to encounter a wide variety of wearable fitness devices such as Fitbit and Apple Watch in the market. Such devices are designed for average consumers who wish to track their lifestyle by counting steps or measuring heartbeats. However, it is rare to find a product for the actual patients who require both the real-time monitoring of a wearable device and the hard protection of a brace.

Personally, one of our teammates ruptured his front knee ACL and received reconstruction surgery a few years ago. After ACL surgery, it is common to wear a knee brace for about two to three months for protection from outside impacts, fast recovery, and restriction of movement. For a patient who is situated in rehabilitation after surgery, knee protection is an imperative recovery stage, but is often overlooked. One cannot deny that such a brace is also cumbersome to put on in the first place.



Our group aims to make a wearable device for people who require a knee brace by adding a health monitoring system onto an existing knee brace. The fundamental purpose is to protect the knee, but by adding a monitoring system we want to provide data and a platform for both doctor and patients so they can easily check the current status/progress of the injury.



1) Average person with leg problems

2) Athletes with leg injuries

3) Elderly people with discomforts



Temperature sensors : perhaps in the form of electrodes, they will be used to measure the temperature of the swelling of the knee, which will indicate if recovery is going smoothly.

Pressure sensors : they will be calibrated such that a certain threshold of force must be applied by the brace to the leg. A snug fit is required for the brace to fulfill its job.

EMG circuit : we plan on constructing an EMG circuit based on op-amps, resistors, and capacitors. This will be the circuit that is intended for doctors, as it will detect muscle movement.

Development board: our main board will transmit the data from each of the sensors to a mobile interface via. Bluetooth. The user will be notified when the pressure sensors are not tight enough. For our purposes, the battery on the development will suffice, and we will not need additional dry cells.

The data will be transmitted to a mobile system, where it would also remind the user to wear the brace if taken off. To make sure the brace has a secure enough fit, pressure sensors will be calibrated to determine accordingly. We want to emphasize the hardware circuits that will be supplemented onto the leg brace.

We want to emphasize on the hardware circuit portion this brace contains. We have tested the temperature and pressure resistors on a breadboard by soldering them to resistors, and confirmed they work as intended by checking with a multimeter.

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