What is a potential reason for the upper extremity terminal device not opening all the way?

The situation where an upper extremity terminal device does not open fully can arise due to housing interference. When the housing of the device is misaligned or obstructed, it can physically block the mechanism that allows the device to open completely. This blockage can occur from debris, improper assembly, or damage to the housing itself, leading to reduced range of motion or functionality in the terminal device.

While issues like improper circuitry, battery incompatibility, or excess weight can all affect the function of a terminal device, the specific mechanical obstruction caused by housing impacts is most directly linked to the inability of the device to achieve full opening. In practice, it’s essential to ensure that the housing is clear and properly aligned to maintain the intended operation of the device.