1. Continuous Blood Gas Monitor
Christopher Troiano
DPM Fall 2012
Continuous Blood Gas Monitor

2. Project Motivation
Participated in an 8-week clinical observation at Strong Memorial Hospital to determine and assess clinical needs for the department of vascular surgery.
Two needs were made abundantly clear:
The desire for a continuous blood gas monitor.
The need to remove clutter from operating and patient rooms.
The intent of this project is to design a device that will satisfy both surgical needs.

3. What is a Blood Gas Monitor?
A blood gas monitor is device that measures key parameters of arterial blood, including but not limited to: pH
Oxygen Tension (partial pressure of O2)
Carbon Dioxide Tension (partial pressure of CO2)
Bicarbonate Levels
Potassium Levels
While there have been developments for a continuous blood gas monitor as recent as 2011, it is currently used only for bypass surgery.

4. Functional Decomposition
Regulate Energy
Pump Blood Past Sensors
Return Blood to Body
Power Sensors
Power Memory
Blood
Heat
Memory
Information
Computer
120V AC
Power USB Port
Power Pump
Obtain Digital Data from Sensors
Store Data in Memory
Pass Data Through USB
Interpret Data
Display Data

5. Customer Needs # Importance Description CN1 2
Output data on a computer monitor; no paper printouts.
CN2 3
Device is portable.
CN3
Data is stored on device.
CN4
Easy to use.
CN5 1
Easy to set up/take down.
CN6
Easy to learn how to use.
CN7
Costs < $500
CN8
Comfortable for patients.
CN9
Safe to use on patients.
CN10
Data updated at least once per minute.
CN11
Runs on AC Power.
CN12
Data is stored on an internal hard drive.
CN13
Operates for Entirety of ICU Visit/Operation Time
CN14
Can be re-steralized using hospital’s sterilization procedures.
CN15
Provides accurate results.
CN16
Blood withdrawal does not endanger patient.
CN17
Can integrate with any modern computer.

6. Potential Solution: IV Line Withdrawal
Patients in the ICU have an IV line inserted in their artery to measure arterial pressure.
Device can integrate with this line and pump blood through sensors before returning the blood to the body or disposing of it.
The data from the sensors is transmitted to and displayed on the attached computer.

7. Staffing 1 Mechanical Engineer 1 Electrical Engineer
Design, Model, and Manufacture Blood Pump
Perform impact stress analyses on device chassis for accidental drop.
1 Electrical Engineer
Determine power requirements for each component.
Transform AC wall outlet current to appropriate DC current.

8. Staffing - Continued 2 Computer Engineers
Design means to transfer data from sensors to internal memory and computer.
Design interactive software that will interpret and display data from the sensors.

9. Budget Primary Costs: Total: $615 pH Sensor: $80
Partial Oxygen Sensor: $400*
Pump Motor: $20
Memory Card: $15
Electrical and Mechanical Materials: $100
Total: $615
*Cost is for a new sensor. Used would be substantially cheaper.

10. Review Scope Budget Feasibility
Reduced to analyzing 2 blood parameters.
Sensors readily available.
Technical requirements do not exceed undergraduate level.
Budget
Assuming the price of the oxygen sensor can be reduced, the project is within budget.
Feasibility
Device is a recreation of similar devices available on the market.
Customer requirements are not too restrictive.

11. Questions?