- Mold will be utilized to create the interface
- Identified need for resin<\/li><\/ul><\/li>
- Researched materials known for their biofidelity in terms of human tissue<\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"http:\/\/engprojects.tcnj.edu\/ngt-assist\/wp-content\/uploads\/sites\/174\/2022\/04\/dragon-skin-1024x502.png\")
<\/figure>\nCharacteristics of focus:<\/span><\/strong> Young\u2019s modulus,viscosity, texture, ease of casting and tactile feedback to the user<\/p>\n<\/div><\/div>\n\n\n\n
Decision Matrix: Material Selection<\/p>\n\n\n\n
<\/td> Price<\/strong><\/td> Ease of casting<\/strong><\/td> Young\u2019s Modulus<\/strong><\/td><\/tr> Vinyl Terminated Polydimethylsiloxane resin <\/strong>
(1,000 cSt)<\/strong><\/td>$26\/100g<\/span><\/span><\/td> Double casting<\/span><\/span><\/td> 0.36 – 0.87 MPa<\/span><\/span><\/td><\/tr> Ecoflex\u2122 00-30<\/strong><\/td> $6\/100g<\/span><\/span><\/td> Vacuum degassing<\/span><\/span><\/td> 0.1 MPa<\/span><\/span><\/td><\/tr> Dragon Skin\u2122 10 NV<\/strong><\/td> $4\/100g<\/span><\/span><\/td> No VD or double casting<\/span><\/span><\/td> 1 MPa<\/span><\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Design Solution: Sensor Incorporation<\/p>\n\n\n\n
\n\nOption 1: Extruding Sensors<\/span><\/span><\/strong><\/p>\n\n\n\n
Main idea:<\/strong><\/span> Placing sensors directly along the pathway through which NGT travels<\/p>\n\n\n\n
Advantage:<\/span><\/strong> Accurate pressure readings <\/p>\n\n\n\n
Disadvantage:<\/span><\/strong> Inaccurate representation of insertion training process <\/p>\n\n\n\n
- Creates unwanted friction that will alter user\u2019s technique<\/li><\/ul>\n<\/div>\n\n\n\n\n
Option 2: Integrating sensors in divots<\/span><\/span><\/strong><\/p>\n\n\n\n
Main idea:<\/span><\/strong> Form divots in inner framework large enough to encapsulate the sensors<\/p>\n\n\n\n
Advantage:<\/span><\/strong> Favors fluidity and realism of insertion process <\/p>\n\n\n\n
Disadvantage:<\/span><\/strong> Less accurate pressure readings<\/p>\n\n\n\n
- Would need to establish acceptable buffer & pressure value thresholds<\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n
Decision Matrix : Sensor Selection<\/p>\n\n\n\n
<\/td> Cost<\/strong><\/td> Sensing Range<\/strong><\/td> Size<\/strong><\/td><\/tr> Interlink FSR UX 400 Short<\/strong><\/td> $3.99<\/span><\/span><\/td> 0.5 N to 150 N<\/span><\/span><\/td> 7.2 mm diameter<\/span><\/span><\/td><\/tr> FlexiForce A301 Sensor<\/strong><\/td> $56.96 total, $14.24 per sensor<\/span><\/span><\/td> 0 to 445 N<\/span><\/span><\/td> 14 mm diameter<\/span><\/span><\/td><\/tr> Interlink FSR UX 406 Short<\/strong><\/td> $4.99<\/span><\/span><\/td> 0.5 N to 150 N<\/span><\/span><\/td> 34 mm2<\/sup> area, square
5.8 mm per side<\/span><\/span><\/td><\/tr>Interlink FSR 402<\/strong><\/td> $7.00<\/span><\/span><\/td> 0 to 100 N<\/span><\/span><\/td> 14.7 mm diameter<\/span><\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Design Solution: Support Structure<\/p>\n\n\n\n
![\"\"](\"https:\/\/engprojects.tcnj.edu\/ngt-assist\/wp-content\/uploads\/sites\/174\/2022\/04\/right_side.png\")
<\/figure>\n- Main goal:<\/strong><\/span> be able to support the sensors and the model of the nasal cavity and nasopharynx<\/li>
- Physiological model based on:<\/span><\/strong> CT scans obtained from Dr. Anthony Lau
- modeled using Mimics Innovation Suite<\/li><\/ul><\/li>
- Support structure for the anatomical model will be a block component<\/li><\/ul>\n<\/div><\/div>\n\n\n\n\n<\/div>\n<\/div>\n\n\n\n
Design Solution: Notification System<\/p>\n\n\n\n
\n\nOption 1:\u00a0 Light By Part<\/span><\/span><\/strong><\/p>\n\n\n\n
Main idea:<\/span><\/strong> Wiring multiple sensors into one light, one light per anatomical section<\/p>\n\n\n\n
Advantage:<\/span><\/strong> \u00a0Fewer lights for the user to keep track of<\/p>\n\n\n\n
Disadvantage:<\/strong><\/span> \u00a0Feedback is less precise, hard to differentiate exact location<\/p>\n<\/div>\n\n\n\n
\nOption 2:\u00a0 Light By Location<\/span><\/span><\/strong><\/p>\n\n\n\n
Main idea:<\/span><\/strong> Wiring each sensor to its own light<\/p>\n\n\n\n
Advantage:<\/strong><\/span><\/span> Will be better able to determine where force is in excess<\/p>\n\n\n\n
Disadvantage:<\/strong><\/span> Too many lights may confuse user as to which sensor is experiencing pressure<\/p>\n<\/div>\n<\/div>\n\n\n\n
Decision Matrix <\/p>\n\n\n\n
<\/td> Clock Rate<\/strong><\/strong><\/td> Price<\/strong><\/strong><\/td> Dimensions (mm)<\/strong><\/td> Programming Language<\/strong><\/td> Power Draw (mA)<\/strong><\/td><\/tr> Arduino Mega 2560 Rev3<\/strong><\/strong><\/td> 16 MHz<\/span><\/span><\/td> $18.40<\/span><\/span><\/td> 101.5×53.3<\/span><\/span><\/td> C++<\/span><\/span><\/td> 20<\/span><\/span><\/td><\/tr> Raspberry Pi Zero W<\/strong><\/strong><\/td> 1 GHz<\/span><\/span><\/td> $10.00<\/span><\/span><\/td> 66.0 x 30.5<\/span><\/span><\/td> C\/C++\/Python<\/span><\/span><\/td> 80<\/span><\/span><\/td><\/tr> Teensy 4.0<\/strong><\/strong><\/td> 600 MHz<\/span><\/span><\/td> $19.95<\/span><\/span><\/td> 35.6 x 17.8<\/span><\/span><\/td> C++<\/span><\/span><\/td> 100<\/span><\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":" Design Solutions Design Solution: Material Selection for Interface Main goal: model characteristics similar to that of a human\u2019s nasal cavity and nasopharynx at the interface (where NGT contacts device) Mold will be utilized to create the interface Identified need for resin Researched materials known for their biofidelity in terms of human tissue Characteristics of focus: … <\/p>\n
- Physiological model based on:<\/span><\/strong> CT scans obtained from Dr. Anthony Lau
- Main goal:<\/strong><\/span> be able to support the sensors and the model of the nasal cavity and nasopharynx<\/li>
- Would need to establish acceptable buffer & pressure value thresholds<\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n
- Creates unwanted friction that will alter user\u2019s technique<\/li><\/ul>\n<\/div>\n\n\n\n