Cardiovascular Stents Lesson Plan ... Microsoft Word - Cardiovascular Stents Lesson Plan.docx Author
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BME Lesson Title Cardiovascular Stents
Grade Level 6-‐8
Time for Activity The activity can take 3 – 5 days depending on the options that are selected, as well as the amount of information on the heart and heart attacks that is discussed. An estimate of the time required for each section is as follows: Engagement: Approximately one 45 minute class period Exploration: 15-‐20 minutes, if stent partially completed in advance 30-‐35 minutes, if full construction done by students Explanation: 45-‐90 minutes depending on the length of the discussion Elaboration: Option 1: 30-‐45 minutes Option 2: The time required depends on the amount of time the students are given during the class period to do their research.
Authors Dr. Brian Davis, Tracy Davis, Dr. Carin Helfer, Melissa Boswell, Visar Berki
Purpose This activity aims at using everyday materials to design and develop devices and approaches to reopen clogged arteries.
Objectives Students will learn about the heart, coronary artery disease, heart attacks, and treatments for coronary artery disease. Students will learn about the circulatory system and biomedical engineering. Students will understand the use of cardiovascular stents to open arteries. Students will be able to define the criteria and constraints for designing a cardiovascular stent. Optional: Students will learn about fluid flow rate, resistance to flow, viscosity, and Poiseuille’s Law.
Materials • For each stent:
o One piece of cut hose approximately 1 in. diameter by 3.5 in. length o 32 push pins; If allowing students to create a second stent during the elaboration section, additional push pins
will be necessary for designs that use more pins o 6 ft. thin wire (easily bent, but stiff enough to hold form); If allowing students to create a second stent, twice as
much wire will be necessary • Several 260Q balloons (thin, long balloons for balloon animals) • Balloon hand pump • Wire cutters • Optional if doing calculation of wire length
o Ruler o Paper and pencil o Calculator
Procedure Preparation Based on the time available for the activity, the students can create the entire stent during the lesson or a portion of the stent can be constructed in advance. The following steps will be completed and the approximate times for completion are as follows:
Steps 1 and 2: 5 minutes Steps 3 and 4: 8 minutes Steps 5 and 6: 15 minutes
These times are only estimates; some students will complete quickly and others may need additional time.
Step 1. Insert 8 pushpins evenly spaced around one end of the tube.
Step 2. Insert 3 more rows of 8 pushpins evenly spaced down the tube. Pins should not be flush against tube; wire will be wrapped around pushpins.
Step 3. Find the center of the wire, fold in half, and loop around a pushpin in one of the middle rows.
Step 6. Repeat this procedure on the other end of tube and remove remaining pins. The wires should end by going under the first loop a second time with another wrap around the loop before the extra wire is cut off.
Extra wrap around the first and last loop
2. Under and through loop to the left
Step 5. After the wires are twisted, choose one end of wire and loop it under and through the loop to its LEFT. Continue an over the pin-‐under and through the loop pattern to the RIGHT until the wire is back to the first loop.
3. Over pin to right
Step 4. Begin wrapping around the center pins in an over-‐under pattern. Use one end of the wire to wrap half of the pins (4 pins on top, 4 pins from a center row) and the other end of the wire to wrap the other half in the opposite direction, until the wire ends meet. Once the wires meet, twist together one time and pull to opposite sides. For next steps, leave center row pins in place and remove as necessary to loop wire.**
1. Wires twisted
4. Under and through loop to the right
Step 7. Remove the stent from the tube. Insert a balloon inside of the stent and inflate. Then deflate the balloon and observe how the stent maintains its form.
** If creating a portion of the stent for the students ahead of time, this is a good stopping point and it should look like this:
For neater storage until use, wrap the extra wire around the tube, at both ends, as shown.
Engagement Have a discussion about heart attacks. Ask the students what they know about this medical condition. Review the basics of the anatomy of the heart (see Useful Resources section for websites with information on the heart and heart attacks). Students can be given the Heart worksheet and asked to fill in the parts of the heart when discussed or the worksheet can be used as an assessment. Review the PowerPoint Presentation Cardiovascular Stents by Dr. Davis. When at the “Create a Stent” slide, tell students that they will create a stent using the items provided. Exploration Have the students work individually or in pairs to create a stent. Provide the students with the Steps for Creating Stent sheet and have them read through all of the steps before starting to construct. (Optional) Have the students estimate and record the total length of wire needed, given the