P11011: Motion-Tracking System Detailed Design Review

1. P11011: Motion-Tracking SystemDetailed Design Review Brittany Bochette Lindsey Clark Mike Ostertag Maya Ramaswamy Andrei Stihi

2. Agenda • Project Background • Knee Flexion System • Updated Customer Needs • Updated Engineering Specs • Sensor and Attachment Choices • Test Plans • Head Tilt System • Updated Customer Needs • Updated Engineering Specs • Sensor and Attachment Choices • Test Plans • Project Budget • Risks • Project Plan • Questions for Audience

3. Project Background • Motion-tracking system that measures knee flexion and head-tilt • Continuation of past senior design groups • P10010 Sensors • P10011 Attachment Methods • Customers are Nazareth Physical Therapy Clinic and Rochester General Hospital

4. Knee Flexion • Clinicians and students work with patients recovering from strokes • Goal is to see improvement in flexion • Sessions are short • Measuring is done by goniometers

5. Updated Customer Needs • Sanitation • Cost

6. Updated Engineering Specs Two new engineering specs were added to address issues of the device needing to be sanitizable, as well as not impeding patients by its size. -The final device will need to either be wipe able, or have removable sleeves that can be washed about once a week. -The outwards size of the device will need to be minimized so that patients are not impeded or hit the device against something.

7. Sensor Selection Criteria • Cost • Ease of Use • Durability • Precision • Ease of Attachment to the Rest of the System • Size – To Fit Into Attachment Method (Low Profile)

8. BendShort Flex Sensor • Pros: • Size • Ease of Use • Cons: • Cost • Durability • Precision • Ease of Attachment

9. Inclinometer Cons: Pros: • Durability • Precision • Size • Cost • Ease of Use • Ease of Attachment

10. Honeywell 785-381L25K Potentiometer Pros: • Cost • Ease of Use • Precision • Ease of Attachment • Size Cons: • Durability

11. BI Technologies Potentiometer Pros: • Ease of Use • Durability • Precision • Ease of Attachment Cons: • Cost • Size

12. HONEYWELL 785-380C3100K POTENTIOMETER (Used as Baseline) • Cost • Ease of Use • Durability • Precision • Ease of Attachment Pros: Cons: • Size

13. Detailed Schematic

14. Attachment Selection • Utilizing the potentiometer sensor, two arms need to extend from either side of it to measure knee flexion. • Slide a neoprene sleeve up the leg with the device attached to the outside of it. • Typical knee brace with Velcro straps around the upper and lower legs. • Wrapping leg in Ace bandages.

15. Attachment Schematic Designed to be incorporated into existing knee braces

16. Test Plans • Included in packet • Based heavily off of last years test plans (same needs apply for most part) • Includes impact testing on enclosure and maximum torque required to impede motion

17. Head Tilt • Studying movement of patients with cervical dystonia • Primarily a research setting • Goal is to see accurate measurement of several movements • Measuring is done by goniometers

18. Updated Customer Needs • Sanitation • Ability to walk around while using the device

19. Updated Engineering Specs • Ability to measure shift of head • Measured in centimeters • Ability to measure while walking • Measured as error to expected value • Ability to be sterilized • Materials must be able to be cleaned by alcohol wipes • Examination for level of sterilization, not required

20. Sensor Selection Criteria • Cost • Ease of Use • Weight/Size

21. Sensor Selection • Atomic IMU • Large form factor • 6 degrees of freedom • Expensive • Razor Ultra-Thin • No on-board regulation • 6 degrees of freedom • Accelerometer • Can’t measure all directions • No on-board regulation • Very inexpensive • Large form factor

22. Sensor Selection • Razor IMU • 9 degrees of freedom • Single, flat board • On-board microcontroller

23. Detailed Schematic

24. Schematic

25. Attachment Selection • Utilizing the 9DOF sensor, it needs to be securely held to the top of the head. A second sensor will need to be fastened to the body. • Baseball cap with the sensor box placed on top. • Headlamp style strap. • Wrestling style head strap. • The body sensor will need to be securely held to the upper chest or back.

26. Attachment Schematic A head strap will be custom sewn from existing headlamp style straps, with an electronics enclosure box on top housing the sensor package.

27. Test Plans Included in packet Will be based largely off last year’s teams testing methods. Both the enclosure and the sensor itself have a list of tests to be performed

28. Connection Interface • Arduino Pro Mini (5V) was selected for the following reasons: • Programmable configurations • Future expandability • Ease of Use • Size • Cost http://www.sparkfun.com/commerce/product_info.php?products_id=9218

29. Interface Agreement • Selected USB as top choice • Speed • Signal Integrity • Universal use • Personal Healthcare USB Device • Standardizes protocol for personal healthcare devices http://www.tomsguide.com/us/pictures-story/12-USB-peripherals-accessories.html

30. Schematic

31. Project Budget

32. Risk Management Updates

33. Project Plan Updates • Updates to the work breakdown structure • Critical path: • Research sensors • Select sensors • Research attachments • Select attachments • Design detailed schematics • Finalize design

34. Questions • FDA approval? Following standards? • How do you think the attachment methods can be improved? • Are the test methods adequate?