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Hydrostatic shock or hydraulic shock is a term which describes the observation that a penetrating projectile can produce remote wounding and incapacitating effects in living targets through a hydraulic effect in their liquid-filled tissues, in addition to local effects in tissue caused by direct impact.〔Deadly fighting skills of the world, Steve Crawford (1999) pp. 68–69〕〔AK-47: the weapon that changed the face of the war, Larry Kahaner, John Wiley and Sons (2007) p. 32〕 Just as force applied by a pump in a hydraulic circuit is transmitted to elsewhere in the circuit because of the near incompressibility of the liquid, so the kinetic energy of a bullet can sometimes send a shock wave through the body, transferring physical shock to tissues whose physiologic function may be disrupted by it (especially in the circulatory or nervous systems). (Other kinds of shock, namely circulatory and psychological, may follow, but mechanical shock is the immediate disruptor.) There is scientific evidence that hydrostatic shock can produce remote neural damage and produce incapacitation more quickly than blood loss effects. In arguments about the differences in stopping power between calibers and between cartridge models, proponents of cartridges that are "light and fast" (such as the 9×19mm Parabellum) versus cartridges that are "slow and heavy" (such as the .45 ACP) often refer to this phenomenon. Human autopsy results have demonstrated brain hemorrhaging from fatal hits to the chest, including cases with handgun bullets.〔Krajsa, J. Příčiny vzniku perikapilárních hemoragií v mozku při střelných poraněních (Causes of pericapillar brain haemorrhages accompanying gunshot wounds), Institute of Forensic Medicine, Faculty of Medicine, Masaryk University, Brno, Czech Republic, 2009.〕 Thirty-three cases of fatal penetrating chest wounds by a single bullet were selected from a much larger set by excluding all other traumatic factors, including past history. It has often been asserted that hydrostatic shock and other descriptions of remote wounding effects are nothing but myths. Correspondence in the journal, ''Neurosurgery'', reviews the published evidence and concludes that the phenomenon is well-established. ==Origin of the theory== In the scientific literature, the first discussion of pressure waves created when a bullet hits a living target is presented by E. Harvey Newton and his research group at Princeton University in 1947:〔An Experimental Study of shock waves resulting from the impact of high velocity missiles on animal tissues, E. Newton Harvey, PhD and Howard McMillen, PhD, Journal of Experimental Medicine, February 1947.〕〔Another early mention of “hydrostatic shock” is Super speed bullets knock ‘em dead, Popular Mechanics, April 1942, p. 9〕 Frank Chamberlin, a World War II trauma surgeon and ballistics researcher, noted remote pressure wave effects. Col. Chamberlin described what he called “explosive effects” and “hydraulic reaction” of bullets in tissue. ''...liquids are put in motion by ‘shock waves’ or hydraulic effects... with liquid filled tissues, the effects and destruction of tissues extend in all directions far beyond the wound axis''.〔Chamberlin FT, Gun Shot Wounds, in Handbook for Shooters and Reloaders, Vol. II, Ackley PO, ed., Plaza Publishing, Salt Lake City, Utah, 1966.〕 He avoided the ambiguous use of the term “shock” because it can refer to either a specific kind of pressure wave associated with explosions and supersonic projectiles or to a medical condition in the body. Col. Chamberlin recognized that many theories have been advanced in wound ballistics. During World War II he commanded an 8,500-bed hospital center that treated over 67,000 patients during the fourteen months that he operated it. P.O. Ackley estimates that 85% of the patients were suffering from gunshot wounds.〔Ackley PO, Col. Frank T. Chamberlin, in Handbook for Shooters and Reloaders, Vol. II, Ackley PO, ed., Plaza Publishing, Salt Lake City, Utah, 1966.〕 Col. Chamberlin spent many hours interviewing patients as to their reactions to bullet wounds. He conducted many live animal experiments after his tour of duty. On the subject of wound ballistics theories, he wrote: Other World War II era scientists noted remote pressure wave effects in the peripheral nerves.〔Livingstone WK, Davis EW, Livingstone KE: Delayed recovery in peripheral nerve lesions caused by high velocity wounding. J. Neurosurg., 2: 170, 1945. 〕〔Puckett WO, Grundfest H, McElroy WD, McMillen JH, Damage to peripheral nerves by high velocity missiles without a direct hit. J. Neurosurg., 3: 294, 1946.〕 There was support for the idea of remote neural effects of ballistic pressure waves in the medical and scientific communities, but the phrase "’hydrostatic shock’" and similar phrases including “shock” were used mainly by gunwriters (such as Jack O'Conner〔O’Conner J, The Hunting Rifle, McMillian, 1970.〕) and the small arms industry (such as Roy Weatherby,〔Gresham T, Gresham G, Weatherby: The Man, The Gun, The Legend, Cane River Publishing, 1992.〕 and Federal “Hydrashock.”) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrostatic shock」の詳細全文を読む スポンサード リンク
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