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Forceps (plural forcipes) are a handheld, hinged instrument used for grasping and holding objects. Forceps are used when fingers are too large to grasp small objects or when many objects need to be held at one time while the hands are used to perform a task. The term 'forceps' is used almost exclusively within the medical field. Outside medicine, people usually refer to forceps as tweezers, tongs, pliers, clips or clamps. 'Forceps' can be used as both the singular and plural form of the word. (Example: "I need a forceps.") Also, it is not referred to as a "pair" as one refers to a "pair of scissors". Etymologically, the word derives from the Latin ''forca'', meaning a snare or trap. Mechanically, forceps employ the principle of the lever to grasp and apply pressure. Surgical forceps are commonly made of high-grade carbon steel, which ensures they can withstand repeated sterilization in high-temperature autoclaves. Lower quality steel is used in forceps made for other uses. Some forceps, intended to be used once and then discarded, are made of plastic. The invention of surgical forceps is attributed to Stephen Hales.〔Scientific American inventions and discoveries By Rodney P. Carlisle〕 There are two basic types of forceps: non-locking (often called 'thumb forceps' or 'pick-ups') and locking, though these two types come in dozens of specialized forms for various uses. Non-locking forceps also come in two basic forms: hinged at one end, away from the grasping end (colloquially such forceps are called tweezers) and hinged in the middle, rather like scissors. Locking forceps are almost always hinged in the middle, though some forms place the hinge very close to the grasping end. Locking forceps use various means to lock the grasping surfaces in a closed position to facilitate manipulation or to independently clamp, grasp or hold an object. == Thumb forceps== Thumb forceps are commonly held between the thumb and two or three fingers of one hand, with the top end resting on the first dorsal interosseous muscle at the base of the thumb and index finger. Spring tension at one end holds the grasping ends apart until pressure is applied. This allows one to quickly and easily grasp small objects or tissue to move and release it or to grasp and hold tissue with easily variable pressure. Thumb forceps are used to hold tissue in place when applying sutures, to gently move tissues out of the way during exploratory surgery and to move dressings or draping without using the hands or fingers. Thumb forceps can have smooth tips, cross-hatched tips or serrated tips (often called 'mouse's teeth'). Common arrangements of teeth are 1×2 (two teeth on one side meshing with a single tooth on the other), 7×7 and 9×9. Serrated forceps are used on tissue; counter-intuitively, teeth will damage tissue less than a smooth surface because one can grasp with less overall pressure. Smooth or cross-hatched forceps are used to move dressings, remove sutures and similar tasks. 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「forceps」の詳細全文を読む スポンサード リンク
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