The longevity of the ink depends on the pen, but most are about 6â8 months. If the pen dries up, you can try heating up the ballpoint part with hot water in case the rollerball is stuck. Another option is to keep the casing and purchase a refill f...
The most common cause of foot drop is injury to the muscle or nerve that controls the foot.Other causes include-. 1  Paralysis of muscles of ankle and foot. 2  Nerve damage. 3  Muscle damage. 4  Nervous system disorders. 5  Multiple sclerosis. 6  Diabetes. 7  Parkinsonâs disease. 8  Tumor or stroke. 9  Muscular dystrophy.
Drop attacks stem from diverse mechanisms, including orthopedic causes (for example, leg weakness and knee instability), hemodynamic causes (for example, transient vertebrobasilar insufficiency, a type of interruption of blood flow to the brain), and neurologic causes (such as epileptic seizures or unstable vestibular function), among other reasons ...