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A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.
Surgical retractors probably originate with very basic tools used in the Stone Age. [3] Branches or antlers of various shapes were used to dig and extract food from the ground. As the use of tools evolved, a variety of instruments came about to substitute for the use of hooked or grasping fingers in the butchering of meat or dissection of bodies.
Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.
The company has a tool line of over 3,500 items including wrenches, ratchets, screwdrivers, tool boxes and air tools. In 2021, SK was acquired by Hangzhou GreatStar Industrial. Jay Leno described the company as "an iconic American brand for decades," [2] and the company is known for inventing the round-head ratchet wrench.
A spreader is a hydraulic tool that is designed with two arms that come together in a narrow tip, and that uses hydraulic pressure to separate or spread the arms. The tip of the tool can be inserted into a narrow gap between two vehicle panels (such as between two doors, or between a door and a fender), then operated to create or widen an opening.
A rib spreader, also known as Finochietto retractor, is a type of retractor specifically designed to separate ribs in thoracic surgery (see picture in external link ). Rack-and-pinion -type stainless steel rib spreaders (with a thumb-screw to lock it in place) were an innovation introduced by French surgeon Theodore Truffier in 1914.