The Lung Model. P16084 Alice D, Dakota B, Jade E, Meaghan E

Transcription

1 The Lung Model P16084 Alice D, Dakota B, Jade E, Meaghan E

2 Overview Model of the respiratory system Components: Chest Cavity Fittings (Trachea) Lungs Diaphragm Ribs

3 Chest Cavity Thermoform PETG Clear, 12 x12 panels Alternative to acrylic Baking to release moisture Prevent bubbling on surface ⅛ thick - Robust

4 Fittings Hose ID x 1/2" FNPT Flexible plastic tubing, ¼ diameter1/2" 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

5 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

6 Lungs - Idea Progression

7 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

8 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

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

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

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

12 Ribs Flexible filament (Ninjaflex) for ligaments in ribs. Experimentation with manufacturing ABS filament. Movement controlled by piston-diaphragm displacement - cable + guide tube system

13 Ribs/Lung Interaction - Test Setup

14 Ribs/Lungs Interaction

15 Ribs/Lungs Interaction Magnets on Lung Magnets on Outside Distance Notes 2 Small 4 Small inches Slight interaction, no stick 2 Small 3 Big 4 Small inches Attractive, moves 2 Small 3 Big inches Attractive, moves 4 Small 3 Big 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.

16 Risk Management Updates: Piston seal breaks: remediation Improper sealing of piston: mitigation

17 Risk Management Continued

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

19 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 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 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 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