• This week we focused on moving from the rough version of the product we had to something presentable and self-contained. We soldered all our components (

  and

  ) leaving behind this mess: . </li>

• On Wednesday (05/01), we concluded the last portions of the project: designing and laser-cutting a wooden box for containing the device. Putting the sodlered components together with the box and 3d printed components for the motor we obtained our final device–a self contained breathing cuff presure monitor.

• That same day we demoed our project. Finally the next week, we met with the Doctor and discussed our prototype! We discussed the size limiations, how it works, and where it could go in the future. We met our goals, fulfilling his requirements and had a great time doing it. </li> </ul>

• Still faced with problems getting consistent readings, we believe that we need to focus on making a better airtight seal within our tubing network and between the tubing and the sensor. We spent a lot of time trobule-shooting if there was an issue with the code, our circuitry, or the air-tightness. Settling on the air-tightness we therefore moved away from tape and used krazy glue adhesive liberally to seal any air gaps. Once allowed to dry overnight, we stopped having problems with the readings.
• We additionally spent time connecting an LCD to display the pressure values, and buttons for user input.

• This week we focused on refining the stepper motor as well as integrating the sensor with the motor to change the pressure in a feedback loop.

• This led to an almost complete system as we had the integral components, i.e. the motor and the sensor working in tandem. We spent more time distancing ourselves from the duct tape actuation to laser cut components that worked more relaiably and could be integrated into the final product. This are shown in the images below: ![here](images/laser1.jpg,</li>

• After consultation with the professor we decided to replace the servo for a stepper motor. This required redisigning the translation of movement from the motor to the syringe. We started with a duct-taped prototype as shown below .</li>

• We received a pressure sensor after and started to program the mBed to read in the values. </li>

• This led us to also create the first version of our tubing system. We decided to allow the doctor access to the standardized syringe port, and also needed to tubing routes for the air–one for our pump and one for our sensor. We put this together as shown in </li> </ul>

• We discussed ways to move the syringe using the motor. We settled on using a syringe pump controlled by a servo with a rack and pinion mechanism.

• Later on in the week, with the above mechanism design already figured out, we 3D-printed some parts and started to assemble the device as shown in </li>

• Afterwards, we began to program the motor, and were able to control its motion but still had some trouble coming up with how exactly we would attach the motor and actuator.

</ul>

Our project consists of a device that monitors and controls cuff pressure of breathing tubes used during surgical procedures. It has audiovisual feedback reporting on the current status of the pressure. It inflates and maintains the pressure based in sensor readings.