Cardiovascular Stents Lesson Plan ... Microsoft Word - Cardiovascular Stents Lesson Plan.docx Author

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Transcript of Cardiovascular Stents Lesson Plan ... Microsoft Word - Cardiovascular Stents Lesson Plan.docx Author

  • 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