Endotracheal Tube AdaptorTeam Members:• Evan Joyce - Team Leader• Ozair Chaudhry - Communicator• Ryan Childs – BSAC• Tim Barry - BWIGAdvisor: • Professor Paul ThompsonClient: • Mark E. Schroeder, MDClient Background• Mark Schroeder, MD– Anesthesiologist at UW-Hospital– Associate professor• 2-3 patients/month require medication during surgery• Administration of aerosolized medication to anesthetized patients– New metered dose inhaler (MDI) are incompatible with his current adaptor– Albuterol and Ipratropium medications1)Anesthesia Circuit Basics2)Why build an adaptor?• Currently uses the “Bronchodilator Tee” by Boehringer Labs– Adaptor connecting MDI, endotracheal tube, and anesthesia circuit• Medication delivery without compromising circuit– 4-5L/min gas flow– Needs to be a closed circuit– Prevent dilution of anesthesia mixture3)Why a New Adaptor is Needed• Propellant and geometrical changes– HFA vs. CFCs--environment– Actuation counter--patient knowledge• New canister – GlaxoSmithKline– Nipple piece is incompatible 4)4)Existing Adaptors• Bronchodilator Tee• Nebulizer• Syringe and old MDI adaptor• Other patents in various shapes and sizes5)6)Client Requirements• Must Have Features– Adaptor must be compatible with the new MDI– Maintain 4-5L/min airflow rate– 70% delivery efficiency– Needs to be sterilized after use with MetriCide• Client Desirable Features– Prototype cost should be under $300 – As “universal” as possible– Medication delivered directly above endotracheal tubeDesign Alternative - Syringe• Basic Concept: Adapter “Syringe” inserted into female Luer port and canister depressed to administer dose• Advantages– Fits existing elbow– Adaptable– Ergonomically friendly• Disadvantages– Fabrication– Could be misplaced7)Design Alternative – Canister Tee• Basic Concept: Modeled after existing device; top portion similar to MDI, bottom portion same as Bronchodilator Tee• Advantages– Failsafe method– Already have geometry• Disadvantages– Efficiency issues– Difficult/expensive to fabricate 7)Design Alternative – The “Y”• Basic Concept: Uses a “Y”-like geometry to minimize the injection to gas flow angle• Advantages– Most efficient– Adaptable• Disadvantages– Bulky– Hard to sterilize and fabricate 7)Design MatrixEfficiency.3Adaptability.25Ease of Use.15Fabrication.1Sterilization.2Total1.0Syringe8(2.4)10(2.5)9(1.35)8(0.8)9(1.8)8.85Canister Tee7(2.1)5(1.25)7(1.05)3(0.3)4(0.8)5.5The “Y”10(3.0)7(1.75)6(0.9)4(0.4)6(1.2)7.25Possible Materials• Metals– Aluminum– Brass– Stainless steel• Plastics– High density polyethylene (HDPE)– Acrylonitrile butadiene styrene (ABS)9)8)Future Work• SolidWorks model of prototype• Find company to manufacture device• Test prototype– Anesthesia gas flow rate and delivery efficiency– Cleaning/durabilitySpecial Thanks To…• Mark Schroeder and the UW-hospital• Professor Thompson• Mark Childs for turning our ideas into sketchesReferences1) http://findadoctor.uwhealth.org/providers/schroder_mar.jpg2) http://www.osha.gov/dts/osta/anestheticgases/fig05.gif3) http://www.boehringerlabs.com/broncho.htm4) Pictures from client5) http://www.myrespiratorysupply.com/images/nebulizer%20kit. JPG6) http://www.patentstorm.us/patents/7207329/description.html7) Sketches from Mark Childs8) http://www.rajshreeoverseas.net/full-images/1061048.jpg9) http://www.directplasticsonline.co.uk/webshop/categories/HDP
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