1. P11011: M OTION -T RACKING S YSTEM D ETAILED D ESIGN R EVIEW Brittany Bochette Lindsey Clark Mike Ostertag Maya Ramaswamy Andrei Stihi

2. A GENDA 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. P ROJECT B ACKGROUND 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. K NEE F LEXION 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. U PDATED C USTOMER N EEDS Sanitation Cost

6. U PDATED E NGINEERING S PECS 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. S ENSOR S ELECTION C RITERIA Cost Ease of Use Durability Precision Ease of Attachment to the Rest of the System Size – To Fit Into Attachment Method (Low Profile)

8. B END S HORT F LEX S ENSOR Pros: Size Ease of Use Cons: Cost Durability Precision Ease of Attachment

9. I NCLINOMETER Durability Precision Size Cons: Pros: Cost Ease of Use Ease of Attachment

10. H ONEYWELL 785-381L25K P OTENTIOMETER Pros: Cost Ease of Use Precision Ease of Attachment Size Cons: Durability

11. BI T ECHNOLOGIES P OTENTIOMETER 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. D ETAILED S CHEMATIC

14. A TTACHMENT S ELECTION 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. A TTACHMENT S CHEMATIC Designed to be incorporated into existing knee braces

16. T EST P LANS 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. H EAD T ILT 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. U PDATED C USTOMER N EEDS Sanitation Ability to walk around while using the device

19. U PDATED E NGINEERING S PECS 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. S ENSOR S ELECTION C RITERIA Cost Ease of Use Weight/Size

21. S ENSOR S ELECTION 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. S ENSOR S ELECTION Razor IMU 9 degrees of freedom Single, flat board On-board microcontroller

23. D ETAILED S CHEMATIC

24. S CHEMATIC

25. A TTACHMENT S ELECTION 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. A TTACHMENT S CHEMATIC A head strap will be custom sewn from existing headlamp style straps, with an electronics enclosure box on top housing the sensor package.

27. T EST P LANS 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. C ONNECTION I NTERFACE 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.p hp?products_id=9218

29. I NTERFACE A GREEMENT 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. S CHEMATIC

31. P ROJECT B UDGET

32. R ISK M ANAGEMENT U PDATES

33. P ROJECT P LAN U PDATES Updates to the work breakdown structure Critical path: 1. Research sensors 2. Select sensors 3. Research attachments 4. Select attachments 5. Design detailed schematics 6. Finalize design

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