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 1/2" Hose ID x 1/2" FNPT ● Nylon Female Adapter Fitting Home depot - Determined ● appropriate size of fittings needed Nylon fittings for cost and visual ● appeal Press fit method vs threading ● 3/4" NPT x 1/2" Hose ID Black Tubing size- originally comparable ● HDPE Adapter to a half size human trachea All fittings are documented in the ● Bill of Materials
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 Jade Thermoforming of chest cavity and associated CAD Work with Meaghan to create and test lungs ● ● Achieving acceptable volumes and flow rates within Spearhead/manage progress of our technical paper ● ● chest Work with Meaghan to build and test stand for model ● Diaphragm piston tolerancing and design and Create user manual for assembly,use, and part ● ● associated CAD replacement Dakota : Rib installation and magnet system to move ● Meaghan Dakota Create lungs with rubber sheet + micro filler beads Print and assemble ABS rib components ● ● Order and create back-up lungs Print and assemble Ninjaflex ligaments ● ● Finalize lung pressure calculations 3-D Printing of Diaphragm ● ● Jade: Test lung pressure when new model is created Sealing of chest cavity seam ● ● Jade: to both procure materials for stand, finalize stand + Alice : Rib installation and magnet system to move ● ● design, and create
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