1. INTELLECTUAL PROPERTY STATEMENT
University of Wisconsin - Madison Biomedical Engineering Design Courses
INTELLECTUAL PROPERTY STATEMENT
All information provided by individuals or Design Project Groups during this or subsequent presentations is the property of the researchers presenting this information. In addition, any information provided herein may include results sponsored by and provided to a member company of the Biomedical Engineering Student Design Consortium (SDC).
Anyone to whom this information is disclosed:
1) Agrees to use this information solely for purposes related to this review;
2) Agrees not to use this information for any other purpose unless given written approval in advance by the Project Group, the Client / SDC, and the Advisor.
3) Agrees to keep this information in confidence until the relevant parties listed in Part (2) above have evaluated and secured any applicable intellectual property rights in this information.
4) Continued attendance at this presentation constitutes compliance with this agreement.
All info provided during this presentation is the property of both our group and the MCoW so this is a confidentiality agreement that whatever you hear today you can’t share with others….

2. Device for acute rehabilitation of the paretic hand after stroke
Team: Carly Brown, Sasha Cai Lesher-Perez, Lee Linstroth, and Nathan Kleinhans

3. Client: Dr. Michelle Johnson Medical College of Wisconsin - Milwaukee
Advisor: Prof. Mitch Tyler
University of Wisconsin - Madison

4. Stroke Demographics Paralysis Rehabilitation 72% over 65 years old
hemiplegia
Rehabilitation
Tennis balls
Electrical stimulation
Robotics
Stroke occurs when a blood vessel in the brain becomes blocked or bursts and stops the flow of oxygen to the brain suffer stroke every year. 72% over the age of 65. third leading cause of death in the US. Leading cause of serious, long-term disability in the US. Disability that usually results is hemiplegia: paralysis on one side of the body. Survivors must go through rehabilitation in order to relearn how to function in daily life or regain control.
mL/100g/min
Blood flow map of an ischemic stroke patient shows reduced blood flow in the right hemisphere of the brain (left side of the image)
Image from:

5. Objective Recover motion of hand in acute phase
Supination / pronation of wrist
±90º from neutral
Flexion / extension of hand
During rehabilitation, the acute phase (3 months post stroke) is a critical phase that usually determines whether a patient will regain motion in the paralyzed limbs or not. The task that our client set forth for us is to design a system that will be used in an inpatient rehabilitation setting that will work the supination/pronation of the wrist (90 degrees) and the flexion/extension of the hand.

6. Last semester’s work Mechanical wrist rotator
Electrical stimulation hand extension
Existing joystick for hand grasp assisted by FES
Mechanical wrist rotator powered by torque motor
Padded armrest
We are continuing our work from last semester. Last semester we designed a mechanical wrist rotator and incorporated FES to assist with the hand grasping motion of the hand.

7. Design changes Fully mechanical system Separate systems
Automated hand grasper
This semester the big changes are that the system will be fully mechanical. We are also separating the motions into two systems. Eventually the systems could be used either alone or in conjunction with each other. The system will also be automated by incorporating a microprocessor.

8. PDS Summary Universal Portable Max 25 lbs $600 Mechanical mechanisms
Wrist rotation
Hand extension
Our design must be accomodating for the wide range in hand, wrist and arm sizes throughout the population. It must be portable, such that it can work on a table, wheelchair tray and be moved between patients readily. Since the device will be moving around, the device should be no more than 25lbs. We will be working on a budget of $600. And due to client specifications, the device will incorporate mechanical systems to drive the motions of the wrist and hand.

9. Design components Wrist rotator Hand grasper Supination / pronation
Flexion / extension
Two designs
The two systems that we have in this design are: wrist rotator and hand grasper

10. Power source (battery)
Wrist rotator
Padded PVC for wrist to sit in
Power source (battery)
Microprocessor
Variables:
Speed
Degree of rotation
This is the wrist rotator, it is similar to what the design was for last semester, but it is smaller and it will be sitting in a u-shaped track that will make the motion smoother, which was a concern of our client. The rotator will sit in btwn and be pulled by cables that are connected to the motor.
Torque Motor
Belt from torque
motor will connect
here
Rollers

11. Hand Grasper: option 1 fingers
Fingers, made of aluminum tubes
Bottom is hollowed to allow full flexion of fingers
Hole for the cable, and where springs will be placed
Where the palm will sit: HDPE and padding
Microprocessor
Stepper motor

12. Hand Grasper: option 2 pump
Holes for
air
Microprocessor
Bladder
-rubber
Pneumatic actuator
Air tube

13. Design Matrix Fingers Pump Cost 2 3 Manufacturing 1 4 Universality
Weighted 1-5
Fingers
Pump
Cost 2 3
Manufacturing 1 4
Universality
PT-friendly
Additional movements
Total 14 16

14. Budget $600 Projected costs: Total: $500 Wrist rotator: $200
Hand grasper: $150
Microprocessor: $150
Total: $500
The budget that we have left over from last semester is $600, we project that this semester we will spend….

15. Future Work This semester Future semesters Construct Client feedback
Redesign based on client feedback
Submission for intellectual property
Future semesters
Microprocessor
Testing
Mechanical
Human
For the rest of this semester, we plan to construct the two systems, present them to our client

16. References
The American Heart Association (2006) (Oct. 17, 2006).
Drabycz, S Stroke. The University of Calgary. Retrieved from on 15 Oct 2006.
Elhendy, A. Health Center Online. Stroke Symptoms. Retrieved from on 7 Oct
Hluštík, Petr, Mayer, Michal Paretic hand in stroke: from motor cortical plasticity research to rehabilitation. Neuropsychiatry, Neuropyschology, and Behavioral Neurobiology 19:
O’Neal, Burke, PhD: UW-Madsion, Personal Communication
Tompkins, Willis, PhD: UW-Madison, Personal Communication