Hands-on Activity Helping Hands:
Engineering Solutions for Multiple Sclerosis

Learning Objectives

After this activity, students should be able to:

• Design and prototype an assistive device to help MS patients hold a pencil and write.
• Apply the engineering design process, including brainstorming, testing, and iterating their designs.

Educational Standards

Each TeachEngineering lesson or activity is correlated to one or more K-12 science, technology, engineering or math (STEM) educational standards.

All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).

In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.

NGSS: Next Generation Science Standards - Science

Materials List

Suggested materials that the groups can “purchase”:

• craft sticks
• straws
• string (30 cm)
• rubber bands
• pipe cleaners
• note cards
• paper clips
• masking tape (30 cm)
• cotton balls
• playdoh

For the entire class to share:

• iPad or laptop with internet access and projector to show videos
• scissors

Worksheets and Attachments

Introduction/Motivation

(Play this video: Facebook Video [shaky hand that struggles to even touch fingers together].).

Take a close look at this person's hand. What do you notice? What questions do you have? (Pause for student responses.) Have any of you ever experienced a time when your hands felt really weak or shaky? Maybe after playing sports for a long time, or when you were very tired? How did that feel? Do you think you would have been able to write with your pencil very well? (Let students offer answers.)

Now, imagine feeling like that all the time. People with a condition called multiple sclerosis, or MS, experience something similar because their nerve cells can't send signals properly.

Let’s do a quick review. What is myelin? (Answer: Myelin is a fatty substance that wraps around the axons of neurons [nerve cells] in the nervous system. Its main function is to insulate these axons, much like the plastic coating on electrical wires, allowing nerve signals to travel quickly and efficiently along the nerve cells.)

How does myelin help nerve signals travel? (Possible answers: Myelin acts like insulation around nerve fibers, helping electrical signals travel quickly and efficiently. It helps protect the nerve fibers from damage. Myelin allows for fast and precise communication between different parts of the body. It speeds up transmission.)

Today we are going to become biomedical engineers and design a device that can help someone with MS. Your challenge will be to design a device that can help someone with MS hold a pencil and write, something all of you do every day at school and have no issues. You'll get to be creative and use what you know about the nervous system, neurons, and myelin to come up with your designs.

Procedure

Background  

Multiple sclerosis (MS) is a chronic disease whereby the immune system attacks the protective myelin sheath that covers nerve fibers. This leads to communication problems between the brain and the rest of the body. Over time, the disease can cause permanent damage or deterioration of the nerves. Symptoms include fatigue, difficulty walking, numbness, and problems with coordination. Understanding how nerve cells work, particularly the role of myelin in facilitating fast signal transmission, is crucial for this activity. The goal is for students to apply their knowledge of the nervous system to create an engineering solution that assists people with MS in performing a fine motor skill task such as writing.

Before the Activity

• Gather all building materials.
• Make copies of the Losing my Fine Motor Skills Article.
• Make copies of the Helping Hands Worksheet.
• Set up an iPad or laptop with internet access and projector to show videos.

During the Activity

Ask & Research (20 minutes)

1. Go through Introduction and Motivation section.
2. Play the following video to learn more about MS: YouTube Video (1:55 minutes).
3. Have a class discussion about what happens when myelin is damaged. (Answer: When myelin is damaged, the signals slow down or get mixed up, making it hard for people to do things like write or button a shirt. MS can make everyday tasks very difficult.)
4. Hand out copies of the Losing my Fine Motor Skills Article.
5. Have students read the article in pairs.
6. After everyone finishes reading the article, lead a class discussion and ask the following questions:

•  “How has Matt’s life been affected by MS?”
• “Have you ever used or seen someone use a device to help them with a task? Maybe a grandparent using a cane, or someone using special tools in the kitchen?"
• “What do biomedical engineers do for MS patients?” (Potential answers: Biomedical engineers develop rehabilitation devices such as wearable exoskeletons, robotic braces, and smart canes, which help patients walk more easily and improve muscle strength and balance. These devices help people with MS regain independence and reduce reliance on caregivers.)

Criteria and Constraints (10 minutes)

7. Divide students into groups of 2-3.
8. Pass out the Helping Hands Worksheet.
9. As a class, define the criteria for the device:

• It must hold a pencil securely.
• It must be easy to use (i.e., can be put on and taken off easily).

10. As a class, discuss the constraints of the challenge:

• Cost – device cannot cost more than $5 worth of materials.
• Time – device must be built in 20 minutes.
• Size – device must be sized to work for middle school students to adults.

Imagine & Plan (10 minutes)

11. Have students work in their groups to brainstorm and sketch their design ideas in their Helping Hands Worksheet.
12. After they settle on one solution, have each group determine the materials they want to use under the set budget in their Helping Hands Worksheet.

Create & Test (20 minutes)

13. Give students 20 minutes to build and test their designs.
14. Have groups test their design by trying to write with the device.
15. Once they have their final design, have them describe their device in their Helping Hands Worksheet.

Evaluate, Redesign and Test (20 minutes)

16. Give students 20 minutes to evaluate, design, and retest.
17. Have students determine what worked well on their design and what needs improvement.
18. Have students write their responses on their Helping Hands Worksheet.
19. Allow students to make necessary modifications to their design and then retest their modified design.

Presentation (10 minutes)

20. Have each group present their final prototypes to the entire class or in small groups, depending on time. Assess each presentation and device based on the Helping Hands Rubric.
21. Summarize the activity by discussing the design process and the importance of iteration and testing in engineering.

Vocabulary/Definitions

assistive device: A product that helps someone perform a function that could not be done without that piece of technology.

biomedical engineering: The application of engineering principles and techniques to problems in medicine and biology.

demyelination: The loss of myelin from the nerve sheaths.

engineering design process: A series of steps used by engineering teams to guide them as they develop new solutions, products, or systems; the process is cyclical and iterative.

multiple sclerosis (MS): A disease that affects the brain and spinal cord, which are important parts of the nervous system. In MS, the protective covering around the nerves, called myelin, gets damaged; this makes it harder for the nerves to send messages to the rest of the body.

myelin: A soft, white, fatty material in the membrane of Schwann cells and certain neuroglial cells.

myelin sheath: A wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.

neuron: A specialized, impulse-conducting cell that is the functional unit of the nervous system, consisting of the cell body and its processes, the axon, and dendrites.

Assessment

Pre-Activity Assessment

During the introduction, be sure to review myelin by asking students how myelin helps nerve signals travel. (Possible answers: Myelin acts like insulation around nerve fibers, helping electrical signals travel quickly and efficiently. It helps protect the nerve fibers from damage. Myelin allows for fast and precise communication between different parts of the body. It speeds up transmission.)

Activity Embedded (Formative) Assessment

Worksheet (In pairs/groups): Have students complete the Helping Hands Worksheet as they work through the activity.

Post-Activity (Summative) Assessment

Use the Helping Hands Rubric to assess the students on their device and collaboration for this activity.

Activity Extensions

1. Advanced Design Challenge: Have students design a more complex assistive device for other tasks affected by fine motor skill loss, such as buttoning a shirt or using utensils.
2. Guest Speaker: Invite a healthcare professional or biomedical engineer to talk about their work with MS patients and assistive technology.
3. Math Integration: Incorporate a math activity where students calculate the cost of materials and budget for creating multiple devices, practicing real-world math skills.

Copyright

Contributors

Supporting Program

Acknowledgements

This material is based upon work supported by the National Science Foundation under grant no. ECC-2055716 - a Research Experience for Teachers program titled Inquiry-Driven Engineering Activities using Bioengineering (IDEA-BioE) at the University of Kansas. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.