A sterile surgical instrument designed to accurately determine the depth of a recess (usually a drilled hole). It typically consists of a moveable (sliding) centerpiece (a prong), the tip of which is inserted into the recess; when the tip makes contact with the bottom a reading is visually taken from a scale marked on the side of the device. It is often used to measure the depth of holes being drilled in bone so that the surgeon can determine the length of the bone screw to be used. It is made of corrosive resistant materials [e.g., stainless steel, titanium (Ti), plastics]. This is a single-use device.
A sterile surgical instrument designed to measure the depth of a recess, usually to measure the depth of holes being drilled in bone so that the surgeon can determine the length of the bone screw to be used. It may take two forms: 1) a device with a moveable (sliding) centrepiece (a prong), the tip of which is inserted into the recess to read from a scale; 2) a circular disc with a central hole which is clipped to a drill bit so that the device slides up as the drill bit is advanced. This is a single-use device.
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