PubMed · 1127186
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I Hirata. 1975. Soft tissue injuries.. https://pubmed.ncbi.nlm.nih.gov/1127186/
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Thorax injuries may be divided etiologically into blunt and penetrating types, depending on the nature of the insult. In European practice, the former predominates by far, and in only about 5% of cases thoracotomy provides the necessary thorax drainage. Morbidity in this type of injury typically involves concomitant lung contusion, sometimes with fatal acute respiratory distress syndrome. In these cases, special ventilation forms, optimal reduction of pain, and organ replacement are the decisive therapeutic methods. In contrast, about 80% of penetrating trauma to the thorax require prompt transpleural or trans-sternal surgery, depending on the type of injury. Emergency first aid must follow the principle of "scoop and run". Each minute elapsed until emergent thoracotomy can be decisive to survival in these cases, and the fastest possible transport from the place of injury takes priority over time-consuming stabilization.
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The effectiveness of the cupping technique, a treatment modality in Traditional Chinese Medicine, in stimulating acupuncture points for pain relief was examined in this paper from a biomechanical perspective. Parametric studies including the effects of vacuum pressure, loading rate, friction coefficient at the cup-skin interface, and size and shape of the cup were carried out using a model based on the finite-element method. The anatomical structures of skin, fat, and muscle were modelled. All the soft-tissue layers were assumed to be nonlinearly elastic and viscoelastic. The rim of the cup was also modelled to study the interaction between cup and skin; the cup rim was assumed to be rigid. The simulation results showed that the stresses in the soft tissue were increased for increasing applied vacuum pressures and that the effects of cupping were mostly limited to the region enclosed by the cup. The simulations also indicated that the magnitude of the applied vacuum may have had direct implications for the severity of bruising of the skin following cupping treatment. Most significantly, the simulation results contradicted the established practice of cup size selection according to the depth of the disorder. Experimental verification of the proposed multi-layered finite-element model is presented. The nature of the bruising inherent to the cupping treatment is also explained by the proposed model.