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Thumb forceps, known simply as forceps in surgical specialties, are commonly held in a pen grip between the thumb and index finger (sometimes also the middle finger), with the top end resting on the first dorsal interosseous muscle at the webspace between the thumb and index finger. Spring tension at the top end holds the grasping ends apart until pressure is applied. This provides an extended pinch and allows the user to easily grasp, manipulate and quickly release small objects or delicate tissue with readily variable pressure. Thumb forceps are used to hold tissue still when applying sutures, to gently move tissues out of the way during exploratory surgery and to access confined cavities that are hard to reach with hands and fingers.

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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.

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.[citation needed] 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.

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Forceps (pl.: forceps[1][2] or considered a plural noun without a singular, often a pair of forceps;[3][4] the Latin plural forcipes is no longer recorded in most dictionaries)[1][2][3][4] 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 in the fields of biology and medicine.[citation needed] Outside biology and medicine, people usually refer to forceps as tweezers, tongs, pliers, clips or clamps.

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Locking forceps, sometimes called clamps, are used to grasp and firmly hold objects or body tissues, or to apply external compression onto tubular structures such as blood vessels or intestines. When they are specifically used to occlude an artery to forestall bleeding, they are called hemostats. Another form of locking forceps is the needle holder, used to guide a suturing needle through tissue. Many locking forceps use finger rings/loops to facilitate handling (see illustration, below, of Kelly forceps). 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.

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Kelly forceps are a type of hemostat usually made of stainless steel. They resemble a pair of scissors with the blade replaced by a blunted grip. They also feature a locking mechanism to allow them to act as clamps. Kelly forceps may be floor-grade (regular use) and as such not used for surgery. They may also be sterilized and used in operations, in both human and veterinary medicine. They may be either curved or straight. In surgery, they may be used for occluding blood vessels, manipulating tissues, or for assorted other purposes. They are named for Howard Atwood Kelly, M.D., first professor of obstetrics and gynecology at the Johns Hopkins School of Medicine. The "mosquito" variant of the tool is more delicate and has smaller, finer tips. Other varieties with similar, if more specialized, uses are Allis clamps, Babcocks, Kochers, Carmalts, and tonsils; all but the last bear the names of the surgeons who designed them.

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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 a corresponding hook on the other. As the forceps are closed, the opposing teeth engage and interlock, keeping the handles adducted and the jaw surfaces clamped constantly. To unlock, a simple shearing push by the fingers is all that is needed to disengage the teeth and allow the grasping ends to move apart.

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Surgical forceps are commonly made of high-grade carbon steel, which ensures they can withstand repeated sterilization in high-temperature autoclaves. Some are made of other high-quality stainless steel, chromium and vanadium alloys to ensure durability of edges and freedom from rust. Lower-quality steel is used in forceps made for other uses. Some disposable forceps are made of plastic. The invention of surgical forceps is attributed to Stephen Hales.[5]

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