Is the kneebag save in put of position situations?

  • Nowadays airbags are part of the standard equipment in almost all new cars. While airbags are saving an increasing number of people from severe injuries and death in moderate and high speed crashes, they do not completely prevent dashboard injuries. The most common mechanism in dashboard injuries is a posteriorly directed force to the proximal tibia with the knee flexed. This may occur during a motor vehicle frontal impact accident when a knee of the driver or the front-seat passenger strikes the dashboard. The posterior force can be combined with a abducting or rotational force leading to concomitant lateral or posterolateral injury. Car and airbag manufacturers therefore develop special inflatable systems to reduce the impact force in dashboard injuries. Every new inflatable system, however, has to be evaluated in out of position situations in which the system might cause injuries to certain body areas. Therefore, we investigated a new kneebag system in different critical seating positions of post mortem test subjects (PMTS). The tested knee airbag module is a folded airbag (18 litre volume) which is installed below the lower section of the instrument panel of a passenger car. Using four PMTS (2 male, 2 female, age 36"67) the following positions were tested: normal seating position, knee flexed >90 degrees and knee flexed <60 degrees in static deployment tests with direct contact. In addition a dynamic test (48.8kph, AAMA-pulse) was carried out with the PMTS belted in a normal seating position. The inflation phase and the impact of the system on the knee/lower leg were analysed by high speed videos. After the test the lower legs of the PMTS were examined by Xray and autopsy. All soft tissue injuries and bone fractures were recorded. All the tests could be evaluated. Except some superficial skin lesions in the impact area no fracture of the bones around the knee and no knee ligament and tendon injuries were observed. Neither video analysis nor autopsy of the PMTS showed any critical contact injuries caused by the inflation process of the bag. Therefore, it can be concluded that in the tested seating positions which are the most critical for the knee area the knee bag system is safe.

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Author:G. Schroeder, U. Bosch
Document Type:Conference Proceeding
Date of Publication (online):2012/08/01
Contributing corporation:Institut für Rechtsmedizin <Hannover>
Release Date:2012/08/01
Tag:Airbag; Bein (menschl); Fahrer; Fahrzeugsitz; Frontalzusammenstoß; Knie (menschl); Knochenbruch; Konferenz; Körperhaltung; Verletzung; Versuch
Air bag (restraint system); Conference; Driver; Fracture (bone); Head on collision; Injury; Knee (human); Leg (human); Posture; Seat (veh); Test
Weitere beteiligte Körperschaft: International Neuroscience Institute <Hannover>
Source:1st International Conference on ESAR "Expert Symposium on Accident Research", S. 189-191
Institutes:Sonstige / Sonstige
Dewey Decimal Classification:3 Sozialwissenschaften / 36 Soziale Probleme, Sozialdienste / 360 Soziale Probleme und Sozialdienste; Verbände
collections:BASt-Beiträge / ITRD Sachgebiete / 80 Unfallforschung
BASt-Beiträge / ITRD Sachgebiete / 84 Personenschäden
BASt-Beiträge / Tagungen / International Conference on ESAR / 1st International Conference on ESAR

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