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Hair-cutting shears are scissors that are specifically designed for cutting hair. They are also known as barber shears, hairdressing shears, or hair shears. They range in size from about 5 to 7 inches (13 to 18 cm) long [1] and commonly have an appendage, known as a finger brace or tang, attached to one of the finger rings.
The finger loops are usually grasped by the thumb and middle or (more often) ring finger, while the index finger is placed on the pivot to help stabilize and guide the instrument. The most common locking mechanism is a handle ratchet , which consists of an asymmetrically serrated short protrusion near the finger loop of one of the handles, and ...
Scissors are used for cutting various thin materials, such as paper, cardboard, metal foil, cloth, rope, and wire. A large variety of scissors and shears all exist for specialized purposes. Hair-cutting shears and kitchen shears are functionally equivalent to scissors, but the larger implements tend to be called shears.
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.
The scissors come in variable lengths and have a relatively high shank-to-blade ratio. They are constructed of stainless steel and may have tungsten carbide cutting surface inserts. The blades can be curved or straight, and the tips are usually blunt. This is the most common type of scissors used in organ-related operations.
Curved-bladed Mayo scissors allow deeper penetration into the wound than the type with straight blades. The curved style of Mayo scissor is used to cut thick tissues such as those found in the uterus, muscles, breast, and foot. Mayo scissors used for dissection are placed in tissue with the tips closed.