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Scissors cut material by applying at the cutting location a local shear stress which exceeds the material's shear strength. Some scissors have an appendage, called a finger brace or finger tang, below the index finger hole for the middle finger to rest on to provide for better control and more power in precision cutting.
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There are two main mechanical types of scissors used in surgery: Ring scissors, which look and function much like standard utility scissors with ring finger loops; Spring forceps are small scissors used mostly in eye surgery or microsurgery. The handles end in flat springs connected with a pivot joint.
A spring between the handles causes the jaws to open again after closing. When not in use, the jaws may be held closed by a safety catch or by a loop holding the handles together. Some types are designed for right-handed or left-handed use only, and some incorporate a rotating handle to reduce friction and minimize hand stress during repetitive ...
There are many different surgical specialties, some of which require specific kinds of surgical instruments to perform.. General surgery is a specialty focused on the abdomen; the thyroid gland; diseases involving skin, breasts, and various soft tissues; trauma; peripheral vascular disease; hernias; and endoscopic procedures.
Common handheld surgical retractors. A retractor is a surgical instrument used to separate the edges of a surgical incision/wound or to hold away certain organs and tissues (i.e. to provide tissue retraction) so that body parts underneath may be accessed during surgical operations.