What is an example of a physical restraint used in healthcare?

A belt or vest designed to prevent a patient from leaving a bed or chair is a clear example of a physical restraint used in healthcare settings. Physical restraints are specifically implemented to limit a patient's movement to ensure their safety or the safety of others when there is a risk of harm. Such restraints must be applied judiciously and in accordance with established guidelines to respect patient autonomy and rights while safeguarding well-being.

In contrast, the other options do not serve this purpose. An intravenous line is a method for administering medication but does not restrict movement. A wheelchair is a mobility aid that enhances a patient's ability to move around, rather than limiting it. Similarly, a pillow is used for support and comfort, not as a means of restraint. Thus, the correct answer highlights a device explicitly designed to control movement in a healthcare context.