The Lung Model P16084 Alice D, Dakota B, Jade E, Meaghan E - - PowerPoint PPT Presentation

The Lung Model

P16084

Alice D, Dakota B, Jade E, Meaghan E

Overview

Model of the respiratory system Components:

• Chest Cavity
• Fittings (Trachea)
• Lungs
• Diaphragm
• Ribs

Chest Cavity

Thermoform PETG

• Clear, 12”x12” panels
• Alternative to acrylic

○ Baking to release moisture ○ Prevent bubbling on surface

• ⅛” thick - Robust

Fittings

• Flexible plastic tubing, ¼” diameter
• Home depot - Determined

appropriate size of fittings needed

• Nylon fittings for cost and visual

appeal

• Press fit method vs threading
• Tubing size- originally comparable

to a half size human trachea

• All fittings are documented in the

Bill of Materials

1/2" Hose ID x 1/2" FNPT Nylon Female Adapter Fitting 3/4" NPT x 1/2" Hose ID Black HDPE Adapter

Lungs

• A half-sized model was constructed
• Rubber was ordered with the new lung dimensions
• Used pressure sensor on blood pressure cuff to test whoopee cushion to

validate that the lung would produce pressures which the Pasco sensor could read.

○ At least 20 mmhg on pressure sensor needed to be reached ○ Recorded pressure values between 30 and 40 mmhg during test

• Mathematical model for pressures

○ Initial model too simple ○ Values from both physiological and benchmarking, to compare our model to ○ Adequate mathematical model still needs to be developed ○ Time spent with Dr. Bailey to eliminate equations to be used

Lungs - Idea Progression

Lungs - Finalized Plan

• A stencil will be used to trace onto

the rubber and cut out the necessary lung shape.

• For the final design, two rubber

sheets will be glued together with Gorilla Glue.

• Each lung can hold a maximum of

1.5 L

• Micro filler beads will maintain the .

75 L of residual volume

• Lungs will be checked for any air

leakage through inflation

Diaphragm

3-D printed piston with Ninjaflex plastic Replicate the flexibility and visual recognizability of the muscle Seal validated with necessary tolerancing - Syringe seal test

Diaphragm (cont.)

Lifetime of piston Over 10k cycles CAD file provided in case of damage (with excess material)

Ribs

Slicing of open source rib cage into 3D printable sections. Optimization of print process for each section.

Ribs

Construction of complete 1:5 scale rib model. Mechanical + Chemical adhesion of rib/ligament sections.

Ribs

Flexible filament (Ninjaflex) for ligaments in ribs. Experimentation with manufacturing ABS filament. Movement controlled by piston-diaphragm displacement

• cable + guide tube system

Ribs/Lung Interaction - Test Setup

Ribs/Lungs Interaction

Ribs/Lungs Interaction

Magnets on Lung Magnets on Outside Distance Notes 2 Small 4 Small 3.125 inches Slight interaction, no stick 2 Small 3 Big 4 Small 3.125 inches Attractive, moves 2 Small 3 Big 3.125 inches Attractive, moves 4 Small 3 Big 3.125 inches Strong attraction, not very repulsive 4 Small 3 Big 2 inches Slightly repulsive, attractive, latched on 1 Small 3 Big 2 inches Attractive, moves

Magnets needs to be stacked and 2.59 inches needed to prevent latching.

Risk Management

Updates:

• Piston seal breaks:

remediation

• Improper sealing of

piston: mitigation

Risk Management Continued

Bill of Materials

The finalized model is $157.41 The second model will cost ~$50 No repurchase of 3D printing materials for additional (3) models.

Plans for Future

Alice

• Thermoforming of chest cavity and associated CAD
• Achieving acceptable volumes and flow rates within

chest

• Diaphragm piston tolerancing and design and

associated CAD

• Dakota : Rib installation and magnet system to move

Jade

• Work with Meaghan to create and test lungs
• Spearhead/manage progress of our technical paper
• Work with Meaghan to build and test stand for model
• Create user manual for assembly,use, and part

replacement Meaghan

• Create lungs with rubber sheet + micro filler beads
• Order and create back-up lungs
• Finalize lung pressure calculations
• Jade: Test lung pressure when new model is created
• Jade: to both procure materials for stand, finalize stand

design, and create Dakota

• Print and assemble ABS rib components
• Print and assemble Ninjaflex ligaments
• 3-D Printing of Diaphragm
• Sealing of chest cavity seam
• + Alice : Rib installation and magnet system to move