Moving through the body wheels car

At the time of moving through the body of the vehicle at speeds of more than 20 km/h usually hit a moving wheel, followed by dragging or pushing away the body. Then the rolling of the wheel and compression. Not always these stages are strictly follow one after the other, depending on the profile of the road, speed, position of the body of the victim. Moving through the body of the victim may occur after his fall due to the impact of a moving car.


Fig. 40. The mechanism of formation of primary nip". 1 - wheel; 2 - body part (lower limb); 3 - peeling of the skin with the formation of the pocket, filled with blood; 4 - tears of the skin; 5 - gap skin; 6 - zone sadnenia on the skin; 7-zone "primary nip".

Fig. 41. Education imprint tread wheels on the skin. 1 - wheel; 2 - a tread of the wheel; 3 - the skin.

The injury rolling wheel of a human body is a complex dynamic process, which consists of a series of events. Primary contact of wheels with the human body is perceived as a solid blow with a blunt object. Due to the rotation of the wheel (between it and the road surface) "tighten" the clothes and skin. Tension service leads to its damage (breaks in the joints, the default buttons and other)and on the skin occur stripped of sadnenia and bruises (in the transverse direction with respect to the movement of the wheel) - "primary pinch". In the field "primary nip" may cause tears of the epidermis caused prirastajte skin. After this, the process of rolling wheel, where as on clothing and body having negative marks tread of the wheel (Fig. 40). The mechanism of their formation the following: at the time of the moving wheel skin is compressed most prominent parts of the tread. Due to compression of blood vessels filled with skin areas relevant stuck to the parts of the tread. In these places are bleeding. Damage that displays a stuck tread, called negative imprint, and speakers - positive. The complex negative and positive prints and is generally tread pattern of the car wheels, which can serve to identify a specific protector (Fig. 41).
To the specific characteristics of this kind of injury can be attributed to a detachment of the skin with extensive pockets filled streamed blood, which are formed in the result of rotating and sliding moving wheel. Limited areas of the body (the femur, tibia) may occur circular detachment of the skin. The severity of this characteristic is influenced by the nature of the soil, the speed of the vehicle, its weight, etc. in Addition to these marks on the skin can detect and typical damage in the form of abrasions that arise from drawing or friction body on the ground or the wheels of the car. Emerging abrasions, bruises or usilenno-lacerations, have a different shape, and the localization of its non-permanent.
The basis of the mechanism of injuries of the bones of skull and brain when moving wheels is the compression of the specified area between two solid objects. When this occurs rough deformation of the skull and the destruction of the brain, part of which is through open fractures and lacerations squeezed out and thrown in the course of the vehicle. The brain substance, preserved in a cavity of a skull, has the form of an unstructured mass. The lack of extensive bleeding in the brain shell and its substance can be explained by the rapid onset of death.
The shape of the flattening of the head, as well as the nature of fractures and propagation of cracks on the bones of the code and skull base, you can set the direction of the applied force.
When you move the wheel of a car moving with a speed of 15 km/h through the chest, get damaged, distinctive feature of which is the mismatch of external internal damage. When minor exterior damage (or even a total lack of it), there are vast, multiple, bilateral, symmetrically located broken ribs, shoulder blades, the spinous processes of the vertebrae. Fractures closed, usually bilateral. When rolling the wheel on your chest arise rib fractures, which are localized in the points of maximal trough edges and can be held at different anatomical lines that depends on the direction of the compression of the chest (Fig. 42).


Fig. 42. The sequence of formation of fractures of ribs when you move the wheel of a car.

Bilateral rib fractures occur in case of moving the body, not only in the transverse direction, but at an angle. Unilateral fractures can occur at rolling wheels along the trunk, one side of the chest. In addition broken ribs, a typical damage can be attributed closed comminuted fractures of the shoulder blades, the spinous processes of vertebras and their bows.
Traumatic changes of internal organs diverse, the possible relocation of organs from one cavity to another, such as the lungs into the abdominal cavity often observed when the rupture of the diaphragm. Special diagnostic importance is the formation of bullous emphysema due to the sharp compression, rupture of the alveoli and movement of air in a zone are not subject to direct pressure.
When you move the wheel of the vehicle through the pelvis occur multiple fractures of pelvic ring. Under the action of forces in anteroposterior direction occur most often fractures pubic bone, sacrum and wings iliac bones in the field of acetabular depressions. The contraction of the pelvic ring sides leads to a transverse fractures pubic bones and wings Ilium.