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The company estimates that about 40,000 people in the United States and 1.2 million worldwide might benefit from the technology.ProDigits have articulating digit underpins that enable holding a fork or a cup (a simple task that is often made difficult with prosthetics currently on the market). Each prosthetic build is customized to the user. Control strategies that can power ProDigits include myoelectric sensors that register muscle signals from the residual finger or palm, or a pressure sensitive switch input in the form of a force sensitive resistor (FSR), or touch pad, which relies on the remnant digit or tissue surrounding the metacarpal bone to provide the necessary pressure to activate the finger.Touch Bionics has also released devices such as the i-LIMB Hand. As with the i-LIMB Hand, a stall feature allows the device to detect when it has closed around an object, also enabling users to point single digits and configure the hand in various grip patterns.Touch Bionics is developing a clinical collaborator program in North America with practitioners to fit patients.