Project Details

For physicians, maintaining accuracy and precision when delivering injections is of the utmost importance. This repeat client sought the help of the Compass Electronics Solutions to design, develop, and manufacture a wearable injection device. Through study and analysis of similar wearable devices, the team created a lightweight, wrist-worn device that uses a motor to help doctors deliver more accurate injections. The device not only improved patient care, but has also been shown to save money by delivering more precise injections of expensive medications.


Precision is key when it comes to injection treatments. Achieving the right balance of volume and speed of the injected material is essential for optimal patient outcomes. But it is not an easy task. The injection process is complicated by a number of factors, including disparate needle sizes, inconsistency in injection sites, and potential muscle fatigue if numerous procedures must be performed in a single day. Delivering consistent results can be difficult even for the best physicians. The client, a global health care company, sought to improve injection procedures by creating a metered pump system that would help doctors to deliver more precise and accurate injections. The client chose to work with Compass Electronics Solutions to bring their idea to market because we have the extensive medical experience necessary to design, engineer and manufacture the device.


For the device to be successful in the market, the product would have to enhance the physician and patient experience without altering care procedures. A small, wearable device would provide the physicians with the assistance necessary to improve precision without affecting the patient’s experience. The design team began by performing an analogous product assessment of wearable devices to identify the associated benefits and challenges. The team evaluated display, buttons, straps, size, weight, placement and materials to determine the best solution for this application.

Next we assembled a team of engineers and designers with relevant experience to create a masterful solution. Several drive system approaches were also investigated, and the team completed a configuration study ensure the most intuitive prototype. The team spared no detail, even studying ergonomics to understand how physicians hold the needle to make the injection. Different grips were identified and assessed for ease of use because the injection angle is important to achieve optimal placement of the material.

With early decisions clarified, our electrical engineers began the work by designing and building the board assembly for a functional prototype. The board assembly drives the motors that help inject viscous material and control the LCD screen. Our software engineers were tasked with creating the motor drive algorithms, which implement design features. The innovative final product allows physicians to alter injection rate, quantity, and charge the battery. Prior to launch, test code verifies the functionality of the hardware and finishing components are integrated into the final form factor.


The medical injector is a lightweight, wrist-worn, motorized device that aids physicians in making finer, more accurate injections. The motor, display, and battery are worn on the side of the wrist, so that the display is visible when the physician positions their arm sideways for the injection. A pronounced connector joins the motor with the handheld injector tool via a wired connection. With the wrist worn form factor, the injection site remains completely visible to the doctor as they perform the procedure. This was essential in aiding in accuracy and precision that was missing from free form injections. The device is completely encased and injection molded, to facilitate hassle-free cleaning and sterilization. Ultimately this has improved patient experience and care.


The client is a global health care and pharmaceutical company focused on developing medical devices that use technology to help physicians provide better patient care. The company strives to create devices in those areas where there are substantial unmet needs.

View Wellness Watch Case Study
Beacon EmbeddedWorks System On Modules (SOMs)

  • Project Name Wearable Injector Helping to improve patient care with wearable devices