P16084: Lung Model

Integrated System Build & Test with Customer Demo

Table of Contents

Team Vision for System Level Demo with Customer

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Construction and Test Results Summary


The lungs had to be deceased in size to 1/4 of physiologically accurate because of the small chest cavity size. Therefore, the new total volume is 1.5L. A new stencil had to be created. The previously used rubber was re-purposed and the set of lung was created as for the previous review. Rubber, from a whoopee cushion purchased from Dollar General, was also re-purposed to furnish a second set of lungs. The two lungs allow for a normal case and a diseased case because of the different compliance's demonstrated. The hot pink lung has a higher compliance and can be utilized to represent emphysema. Both set of completed lungs were tested for any air leakage. The sphygmomanometer was utilized to test for pressure to check that the output could be read by the PASCO instrumentation in the lab. Both tests were successful.

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The ribs were cleaned via sandpaper and medical pliers. The cleaning took between 6 and 7 hours. The lower front of the spine was shaved so that the ribs would better fit around the chest cavity. The ribs will sit on a block of wood, between the chest cavity and the rib movement support beam. The stencil is made for the height needed for this block.

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Rib Movement

A demo was built of the rib movement system. An eye hook was screwed into the top of the piece of wood. This piece of wood will positioned behind the ribs and attached to the stand of the completed model. A series of eye hooks will function similar to that of a fishing pole to guide the wire from the attachment points of the ribs to the point of attachment on the load cell. The point of attachment on the load cell was tested and finalized.

Chest Cavity

The chest cavity shape had to be altered to accommodate the ribs. Therefore, a new mold was 3D printed and the attempt, although unsuccessful, was made with the .25 inch PETG sheet. A successful attempt was made after altering the mold again.Unfortunately, the 3D printed mold got stuck in the thermoformed cavity. After many attempts, the mold could not be freed from the cavity. This kept the complete system integration from taking place. More plastic sheets have already been ordered.

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All fittings, between the "air" and the chest cavity were tested. The table below was constructed to display the purpose of the fitting and location of placement. All fittings are compatible with the necessary lab software.

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The stand was to be fully constructed. With the issue of the cavity, the stand construction was halted because of hole placement.

Risk and Problem Tracking

Many of the risks have been eliminated or lessened at the closure of this phase. The updated risks can be found here.

The updated problem tracking can be found here.

Plans for next phase

All final plans will be completed as a group. These include:

Home | Planning & Execution | Imagine RIT

Problem Definition | Systems Design | Subsystem Design | Preliminary Detailed Design | Detailed Design

Build & Test Prep | Subsystem Build & Test | Integrated System Build & Test | Integrated System Build & Test with Customer Demo | Customer Handoff & Final Project Documentation