Session 66 Peter Halldin

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Den mödosamma vägen till bättre cykelhjälmar

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Session 66 Peter Halldin

  1. 1. Den mödosamma vägen till säkrare (cykel)hjälmar Peter Halldin Division of Neuronic, School of Technology and Health Royal Institute of Technology, Stockholm, Sweden MIPS AB, Stockholm, Sweden
  2. 2. Outline <ul><li>Biomechanical research at KTH </li></ul><ul><li>The MIPS helmet </li></ul><ul><li>The KTH oblique test methods </li></ul><ul><li>The way to safer helmets and a new oblique test standard </li></ul>
  3. 3. The School of Technology and Health, at the Royal Institute of Technology
  4. 4. Research activities at the Division of Neuronic, KTH <ul><li>Current Projects: </li></ul><ul><ul><li>Impact biomechanics </li></ul></ul><ul><ul><ul><li>Helmet research (1996-) </li></ul></ul></ul><ul><ul><li>Clinical applications </li></ul></ul><ul><ul><ul><li>Visualisation of trauma (2002-) </li></ul></ul></ul><ul><li>Example of collaboration partners: </li></ul><ul><ul><li>Volvo (1997-) </li></ul></ul><ul><ul><li>SAAB (2006-2008) </li></ul></ul><ul><ul><li>USAARL (2003-2006) </li></ul></ul><ul><ul><li>Swedish Police (2000-) </li></ul></ul>
  5. 5. Ongoing helmet research at KTH <ul><li>Set a new test standard for all helmet segments </li></ul><ul><ul><li>Member in SIS (Sweden) </li></ul></ul><ul><ul><li>Member in CEN TC158 (EU). </li></ul></ul><ul><ul><li>Member in ASTM (US). </li></ul></ul><ul><li>Safer helmets </li></ul><ul><ul><li>FIS - Set a new specification for DH and Super-G helmets. </li></ul></ul><ul><ul><li>WG leader in COST TU1101 - Injury reconstruction of bike accidents. The goal is a better understanding of bike accidents in order to set a new spec for helmets and test methods. </li></ul></ul>
  6. 6. The problem! <ul><li>About 20 cyclists and 40 MC drivers are killed, and about 300 cyclists and 300 MC drivers are severely injured every year in Sweden. </li></ul><ul><li>The most common and severe injuries from bike and motorcycle accidents are head injuries. </li></ul><ul><li>Helmet use in EU is 1-37% (Sweden 27%). </li></ul><ul><li>Helmets design have not changed much the last decades </li></ul>
  7. 7. Conservative test methods Is this realistic?
  8. 8. Accident statistics <ul><li>-shows that the most common impact situation is an oblique impact . </li></ul>Radial = Oblique + Tangential
  9. 9. Types of head injuries Radial Tangentiel Translational Angled Rotational Impact Direction Acceleration direction
  10. 10. Types of head injuries Radial Tangential Angled <ul><li>Fracture </li></ul><ul><li>Concussion </li></ul><ul><li>Contusion </li></ul><ul><li>Concussion </li></ul><ul><li>Subdural haematoma </li></ul><ul><li>Diffuse axonal injury </li></ul>Conventional helmets Helmets with MIPS Low Friction Layer Type of injury Acceleration direction Impact Direction
  11. 11. The KTH head model LS-DYNA (Kleiven et al. 2008) Superior- Sag. Sinus Pia mater Corpus Callosum Thalamus Falx Midbrain Brainstem Transverse- sinus Tentorium
  12. 12. First principle strain distribution for EPP 31 kg/m 3 in radial impact First principle strain distribution for EPP 31 kg/m 3 in oblique impact Radial vs. oblique impact
  13. 13. We defined a need…… <ul><li>for more realistic helmet test standards </li></ul><ul><li>and helmets with better protection in oblique impacts </li></ul>
  14. 14. Outline <ul><li>Biomechanical research at KTH </li></ul><ul><li>The MIPS helmet </li></ul><ul><li>The KTH oblique test methods </li></ul><ul><li>The way to safer helmets and a new oblique test standard </li></ul>
  15. 15. The Product – ”copying the evelution” The cerebrospinal fluid has been mimiced With a teflon layer (b) in the helmet. Snett islag M.I.P.S. – Multi-directional Impact Protection System
  16. 16. Outline <ul><li>Biomechanical research at KTH </li></ul><ul><li>The MIPS helmet </li></ul><ul><li>The KTH oblique test methods </li></ul><ul><li>The way to safer helmets and a new oblique test standard </li></ul>
  17. 17. The KTH oblique helmet impact test Resultant = 7m/s:45º 5m/s 5m/s
  18. 18. The KTH oblique helmet impact test
  19. 19. MIPS making helmets safer MIPS reduce the rotational violence by over 40%
  20. 20. Proposal for a new oblique test standard <ul><li>Member in ECE (European test standard committee), ASTM (US). </li></ul><ul><li>Active in FIS </li></ul><ul><li>For equestrian and bike the proposed impact speed is 7m/s and the impact angle is 30 degree. </li></ul><ul><li>The test is done without the neck. </li></ul><ul><li>Three different impact sites on helmet. </li></ul><ul><li>Use normal drop tower for free falling head. </li></ul><ul><li>Pass/Fail criteria – need to decide on injury level – mild or severe. </li></ul>
  21. 21. Outline <ul><li>Biomechanical research at KTH </li></ul><ul><li>The MIPS helmet </li></ul><ul><li>The KTH oblique test methods </li></ul><ul><li>The way to safer helmets and a new oblique test standard </li></ul>
  22. 22. History <ul><li>Idea 1996, Patent 1998, MIPS AB 2001 </li></ul><ul><li>Three Doctoral Thesis 2001-2004 </li></ul><ul><li>Research funding: 3 MSEK. (LFFF, VINNOVA, VR) </li></ul><ul><li>Investments in MIPS AB 2001-2011: 32 MSEK </li></ul><ul><li>First product on market: Equestrian 2007. </li></ul><ul><li>Market: World wide. Bike, Snow, Equestrian, MC, icehockey. </li></ul><ul><li>Marketing strategies: Gortex </li></ul>
  23. 23. Future <ul><li>Continue with basic research (Injury reconstruction of real accidents). </li></ul><ul><li>Lobbying for better test methods (all segment). </li></ul><ul><li>MIPS or other helmet technologies for improved protection </li></ul>
  24. 24. Tack till <ul><li>Länsförsäkringsbolagens forskningsfond </li></ul><ul><li>VINNOVA </li></ul><ul><li>VR </li></ul>[email_address]

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