Session 66 Peter Halldin

Division of Neuronic EngineeringPeter Halldin, [email protected] CEN/TC158 Berlin 2010-06-14

Den mödosamma vägen till säkrare (cykel)hjälmar

Peter Halldin

Division of Neuronic, School of Technology and HealthRoyal Institute of Technology, Stockholm, Sweden

MIPS AB, Stockholm, Sweden


Outline

• Biomechanical research at KTH

• The MIPS helmet

• The KTH oblique test methods

• The way to safer helmets and a new

oblique test standard

Division of Neuronic EngineeringPeter Halldin, [email protected] Transportforum 2012

The School of Technology and Health, at the Royal Institute of Technology


Research activities at the Division of Neuronic, KTH

• Current Projects:– Impact biomechanics

• Helmet research (1996-)

– Clinical applications• Visualisation of trauma (2002-)

• Example of collaboration partners:– Volvo (1997-)– SAAB (2006-2008)– USAARL (2003-2006)– Swedish Police (2000-)


Ongoing helmet research at KTH• Set a new test standard for all helmet segments

– Member in SIS (Sweden)– Member in CEN TC158 (EU). – Member in ASTM (US).

• Safer helmets– FIS - Set a new specification for DH and Super-G helmets.– 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.


The problem!

• About 20 cyclists and 40 MC drivers are killed, and about 300 cyclists and 300 MC drivers are severely injured every year in Sweden.

• The most common and severe injuries from bike and motorcycle accidents are head injuries.

• Helmet use in EU is 1-37% (Sweden 27%).

• Helmets design have not changed much the last decades


Conservative test methods

Is this realistic?


Accident statistics

maF

ghv

2 -shows that the most

common impact situation

is an oblique impact.

Radial

=Oblique

+Tangential

Division of Neuronic EngineeringASTM Atlanta 2009 Peter Halldin, [email protected] , Svein Kleiven

Types of head injuriesRadial Tangentiel

Translational

Angled

Rotational

Impact Direction

Accelerationdirection


Radial TangentialAngled

Type of injury• Fracture• Concussion• Contusion

• Concussion• Subdural haematoma• Diffuse axonal injury

Accelerationdirection

Impact Direction

Conventional helmets

Helmets with MIPS Low Friction Layer

Types of head injuries


The KTH head model

Superior-

Sag. Sinus

Pia mater

Corpus Callosum

Thalamus

Falx

Midbrain

Brainstem

Transverse-sinus

Tentorium

LS-DYNA (Kleiven et al. 2008)


First principle strain distributionfor EPP 31 kg/m3 in radial impact

First principle strain distributionfor EPP 31 kg/m3 in oblique impact

Radial vs. oblique impact


We defined a need……

• for more realistic helmet test standards

• and helmets with better protection in oblique impacts


Outline


• The MIPS helmet





The Product – ”copying the evelution”

The cerebrospinal fluid has been mimicedWith a teflon layer (b) in the helmet.

Snett islag

M.I.P.S. – Multi-directional Impact Protection System


Outline


• The MIPS helmet


• The way to safer helmets and a

new oblique test standard


The KTH oblique helmet impact test

Resultant = 7m/s:45º

5m/s

5m/s


The KTH oblique helmet impact test


MIPS making helmets safer

MIPS reduce the rotational violence by over 40%


Proposal for a new oblique test standard

• Member in ECE (European test standard committee), ASTM (US).

• Active in FIS • For equestrian and bike the proposed impact speed is

7m/s and the impact angle is 30 degree. • The test is done without the neck.• Three different impact sites on helmet.• Use normal drop tower for free falling head. • Pass/Fail criteria – need to decide on injury level – mild

or severe.


Outline


• The MIPS helmet





History

• Idea 1996, Patent 1998, MIPS AB 2001• Three Doctoral Thesis 2001-2004• Research funding: 3 MSEK. (LFFF, VINNOVA, VR) • Investments in MIPS AB 2001-2011: 32 MSEK• First product on market: Equestrian 2007. • Market: World wide. Bike, Snow, Equestrian, MC,

icehockey.• Marketing strategies: Gortex


Future• Continue with basic research

(Injury reconstruction of real accidents).

• Lobbying for better test methods (all segment).

• MIPS or other helmet technologies for improved protection


Tack till

• Länsförsäkringsbolagens forskningsfond

• VINNOVA

• VR

[email protected]

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Session 66 Peter Halldin

Education