Transcript Document

Endotracheal Tube Cuff
Pressure Indicator
Client: Dr. Lester Proctor
Advisor: Kristyn S. Masters
Team V-Tec
Michael Alexander - Team Leader
Claire Edlebeck - BWIG
Samantha Bergh - Communications
Tyler Lark - BSAC
Lucas Vitzthum - Graphics
Outline
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Problem Statement
Background
Existing Devices
Design Constraints
Design Ideas
Design Matrix
Future Work
Problem Statement
 Endotracheal Tubes
 Cuff Pressure
 Optimal Pressure Range
 Use in pediatrics
Background Information
 20,000 Operations Annually
 25% Children
 75% Require Endotracheal Tube
 Inflatable Cuff for Adults
 Advantages
 Tight Seal
 Prevents Aspiration
 Disadvantages
 Ischemia due to excess pressure
 Risk Increased in Children
Current Devices
Patents
On the Market
 Several
 None marketed
 Not similar to our
Hi-Lo® Tracheal
designs
Tube with Lanz®
PressureRegulating Valve
Design Constraints
 Pressure-Regulation
 Performance level
 Disposability
 MRI/CT Compatibility
Electrical Design Solution
 Uses electrical
pressure transducer
 Measures pressure
inside cuff
 Translates different
pressures into
distinct voltages
 Voltage powers the
corresponding LEDs
Source: omega.com, Tim Shedd
Electrical Design (cont.)
 Pros
 Highly Accurate,
Precise
 Visually exact
 Cons
 Expensive
($85.00/unit)
 May interfere with
medical equipment
 Not MRI compatible
Mechanical Design
 Pressure gauge
attached near pilot
balloon
 Pressure acts on
piston inside device
 Piston increasingly
protrudes indicating
pressure
Mechanical Design (cont.)
 Pros
 Economic
 Versatile
 Cons
 Difficult to calibrate
 Requires MRI
compatible form of
resistance
Design 3: Relief Valve
Additional valve and tube
attached to pilot balloon
 Standard pressure relief
valve
 Predictably fails at 25 cm
H2O pressure
 Clamp allows for override
Relief Valve: Pros & Cons
Pros
 Reliably releases
pressure
 Safe
Relatively
inexpensive to
manufacture
Cons
 MRI Interference
Precision
manufacturing required
 No longer embodies
our clients preference
Design Matrix
Safety
Client
Ease Effective- Price Total
(10) Preference
of
ness (5) (10) (40)
(10)
Use
(5)
Electrical
9
1
5
4
1
20
Mechanical
8
10
4
4
10
36
Relief
Valve
10
6
5
3
7
31
Future Work
DESIGN
•Specify dimensions
of prototype
•MRI compatibility
•Discuss with client
CREATE
PROTOTYPE
•Obtain necessary skills in
machine shop
•Investigate means of
fabrication
•Molding
•Machining
•Rapid Prototyping
TESTING
•Accuracy of Pressure
Reading
•Constant Rate of
Pressure Release
•Repeatability and
Reproducibility
•Labview
Any Questions?