The choice of diluent is dependent upon the extent of neurolysis desired. The use of higher concentrations of phenol might predispose to a higher incidence of vascular injury. Shelf life exceeds one year when the solution is refrigerated and not exposed to light.
You asked whether a person can get a modification of a child support order that is nearly 20 years old to increase the time period for paying child support by requiring payment until the child reaches an age beyond the age specified in the original order.
The majority of states use 18 as the age of majority (in cases where the youth is still in high school the age of majority may extend beyond 18). States may order support while a child is in college (For more information, visit Termination of Support- College Support Beyond the Age of Majority). An exception to the rule that parents' duty to support their children ends at the children's majority occurs when the child is disabled.