Blog Posts

Testing, testing, 1, 2, 3 (Week 4)

This week was all about testing and acquiring quantitative data to prove our project meets the specifications of the scope of work and can function properly. This data is also essential for us to see if our current model requires any modifications or debugging.
The mechanical team was able to test if the capillary tubing would produce a flow rate close to the flow rate shown on the LCD screen of the control system. After testing, it was proven that both the change in tube sizing and the small size of the capillary tubing prevented the flow rate of the system to go above 30 mL/min even if the control system was set at a higher flow rate.

Plot of the flow rate results over the theoretical flow rate. The ideal, or target, flow rates are shown by the red x’s and the tested flow rate results are shown by the blue dots.

The electrical team has completed the assembly of the power system, enabling a single power source to supply the entire system, including peripherals. Additionally, they have conducted flow generation accuracy and precision testing jointly with the mechanical team. Data analysis confirmed the precision of the flow generation, but accuracy requires improvement. This would be achieved through applying control algorithms and fine-tuning the parameters . Lastly, the team has enhanced the testing software to have manual control features, allowing the whole team to test the system directly.

The completed assembly of the power system.

Connecting the Pieces Together (Week 3)

Our first QRB was a success! The team presented to 4 IPPD coaches our plan for the semester, project risks, and the overall design of our system. The coaches provided valuable feedback that the team will be using to improve the project by the next QRB at the end of February, such as completing more quantitative testing and remodeling our 3D CAD model.

This week, the first iteration of connecting capillary tubing to the current tubing for the peristaltic pump was tested for any leaks, sizing of the connection, and compatibility with the system. The testing proved that the capillary tubing was compatible with the system and the connection would require a 2nd iteration that included a barb at the end to prevent leaks. This 2nd iteration is currently being printed within the IPPD lab and will be tested to its attachment security to the tubing, as well as its ability to allow continuous flow into the capillary tubing. On the electrical side of the project, the team was able to finish the power system assembly to begin testing by next week.

Connection of the current tubing to the capillary tubing

Testing and GUI Development (Week 2) 

The mechanical team is ready to test how our tubing will react to different angles that it may undergo while in use. To ensure that we are accurately measuring the angles of the tubing at even increments, we modeled a testing apparatus that will hold the model. The results from this test will allow us to know if the flow pattern and flow rate change at different angles, and how to mitigate these changes within our system to ensure consistency. The testing apparatus is pictured below! 

SolidWorks model of the testing apparatus that will test flow pattern of fluid at different angles

Heon was able to configure the development environment as well as develop a preliminary GUI for the monitoring software. Specifically, the GUI will be used within the flow rate measurement system of our project. This flow rate will be displayed on an LCD screen and is projected to have users be able to change it via a remote control. 

Test monitoring system to assist with flow rate control

We’re Back! (Week 1)

Saline Sync has returned from winter break and is ready to continue the project! We held a team meeting the first day of school to catch up with one another, discuss plans for the rest of the semester, and begin assigning tasks to one another. In order to ensure the device meets Arthrex’s standards, we are currently looking into testing the tube iterations and the electrical configurations. To begin testing iterations of tubes for the device, the team is currently designing the testing setup and procedures. The ADC testing setup is completed, and the electrical team has begun testing this week. We also met with our liaisons this week to go over our plans for testing, as well as confirm times for weekly update meetings. We are very excited to pick up the pace and continue working on this project.

Saline Sync’s first team meeting of the spring semester!

SLDR Day! (Week 15)

The team successfully presented the System Level Design Review (SLDR)! The event included a networking hour for students to meet with other liaisons from different IPPD teams, as well as a keynote activity where students had the opportunity to learn from liaisons and coaches about how to prepare for industry. After these activities, the team presented our SLDR in a private room, as well as gave a live demonstration of the current prototype to Arthrex liaisons, Troy Garrison and Elizabeth Wildsmith. Troy and Elizabeth gave the team some advice for development into the next semester and ways to present the final prototype to the rest of the Arthrex team such as ensuring we had a plan for how Arthrex would sell the product. Overall, they were happy with the team’s progress and excited to see how the final prototype will turn out! 

The team and liaison engineers after presenting our SLDR

The team will be heading into winter break next week and will come back in January with fresh minds ready to hit the ground running! Our goals as a team will be to begin experimentation with flow rates and 3D printing more iterations of the attachments to the system. 

SLDR Peer Review! (Week 13)

The end of the semester is coming up and the team is busy with preparations for the System Level Design Review (SLDR) presentation! SLDR will take place December 3rd and will include a networking hour to allow IPPD students to speak with liaisons of other companies that sponsor a project in IPPD, and a team presentations segment where teams will be split into rooms to present their SLDR to their liaisons and other teams who are in the same room. Our team will be presenting in our own private room with Arthrex to go into the details of the project, the current prototype, and plans for the next semester.

This week, the team presented the SLDR presentation to other IPPD students and coaches for peer review. The peer review revealed areas for improvement the team could take initiative of before the actual event. Areas for improvement included making presentation slides less word-heavy, adding more visuals and guides for audience engagements, and distributing the speakers more. Overall, the team did very well in elocution, energy, and showcasing knowledge of the subject.

Prototype Inspection Day and SLDR time (Week 12)

The team’s first Prototype Inspection Day has been completed and the team recieved fantastic reviews! We presented our current prototype to 6 judges, along with our future experiment plans to ensure the final prototype meets expectations. Our prototype has the ability to control flow rate of the system with a touch screen. The team received feedback from the judges and suggestions on how to elevate the prototype, such as designing ways to ensure sanitation and recommendations of potential vendors from which to order custom made parts.

Saline Sync getting ready to present to judges!

The team currently is onto the next milestone of drafting the SLDR. The SLDR peer-review is next Tuesday and approaching fast, so the team is taking feedback from prototype inspection day now and applying that to our next presentation. The peer-review will be another opportunity for the team to gain feedback about the project’s current progress as well as presentation skills before we present the SLDR to Arthrex in December.

Models and Prototype Demonstration Practice (Week 11)

Prototype Inspection Day is next week, and the team has prepared models and demonstrations for the big day! The team was able to model and 3D print a tube design made with 95A TPU to test the material’s flexibility as well as the feasibility of the model. This model will be used during PID to show the judges concepts that the team may potentially move forward with for our final design. The mechanical team has also developed two more tube concepts that we plan to model by the end of the week.  

The prototype will be used to display the team’s current ability to control the flow rate of water through the pump system. Through a mock setup of the demonstration, the team found that we still require supplies, such as duct tape and zip-ties, to hold parts in place to allow the judges to have a clear view of our set up. Overall, this mid-stage prototype is ready to show to the judges and the team is eager to gain feedback from the judges.  

Saline Sync setting up the prototype demonstration

Preparing for Prototype Inspection Day (Week 10)

Our first Prototype Inspection Day is coming up quickly and the team is busy preparing the physical models and demonstrations for it! The electrical team was able to develop a Python script that can control the flow rate of water through our proof-of-concept pump system. Below is a photo of Yiwei with the pump and tubing set up that is controlled by the code on the computer screen.

Yiwei testing the pump system set up and how to control flow rate

The mechanical team have been working on CAD models of attachments to the system to print out by next week for demonstrations. The mechanical team has also researched different peristaltic pumps to buy for the final prototype with the goal of achieving less pulsating flow. Alternative methods such as changing the tube size and the use of a dampener are also being explored for different concept designs.

Traveling to Arthrex and Presentation (Week 9)

The team traveled to Naples last week and met with the Arthrex team! During this visit, the team had the opportunity to present the PDR for the project, observe a cadaver lab using one of Arthrex’s devices, and walk through their R&D Lab. The labs were the highlight of the team’s experience as we got to see a true visual of how Arthrex aims to provide minimally invasive surgical care and how a physician would use those devices. Through the cadaver lab, in particular, the team was able to speak with one of the physicians to understand what they struggle with, what they would like to see included or improved, and any areas of risk that they believe we should keep in mind whilst designing our own device.

Saline Sync after the PDR presentation

Currently, we are looking forward to prototype inspection day (PID) that will be November 12th. The mechanical team is working on 3D modeling new concepts for the tubing attachments and will send these models to print for testing within the next week. The testing will include using the peristaltic pump and water with the 3D models to simulate how they will perform with the final saline pump. The electrical team has a GitHub platform setup to begin coding the flowrate of the saline control system.