Strahle Jennifer, Collins Kelly, Stetler William R, Smith Brandon W, Garton Thomas, Garton Catherine, Garton Hugh J L, Maher Cormac O
Department of Neurosurgery, University of Michigan, Ann Arbor, Mich., USA.
Pediatr Neurosurg. 2013;49(1):21-3. doi: 10.1159/000355247. Epub 2013 Oct 29.
Magnetically programmable shunt valves are susceptible to environmental factors including magnetic fields and accelerative forces. It is unknown if rollercoasters with or without magnetic brakes or linear induction motors (LIMs) are capable of altering the setting of a programmable shunt valve.
Two different valve types (type A, n = 10; type B, n = 9) were tested at varying resistance settings in 2 trials on 6 different amusement park rides including 2 rides with LIMs, 2 rides with magnetic brakes, and 2 rides without magnetic technology.
The performance level of valve type A and the setting of valve type B changed on rollercoasters with magnets (A = 2.5% [2/80]; B = 5.6% [4/72]) and without magnets (A = 7.5% [3/40]; B = 2.8% [1/36]). Neither valve setting changed when exposed to a Ferris wheel or during ambulation throughout the park.
Magnetically programmable valves are susceptible to changes in pressure settings when exposed to amusement park rides with elevated vertical gravitational forces, irrespective of the presence of LIMs or magnetic brakes.
磁控可编程分流阀易受包括磁场和加速力在内的环境因素影响。带有或不带有磁制动或直线感应电机（LIM）的过山车是否能够改变可编程分流阀的设置尚不清楚。
在6种不同的游乐园游乐设施上进行了2次试验，对两种不同类型的阀门（A型，n = 10；B型，n = 9）在不同阻力设置下进行测试，这些游乐设施包括2个带有LIM的设施、2个带有磁制动的设施和2个没有磁技术的设施。
A型阀门的性能水平和B型阀门的设置在带有磁铁的过山车（A型 = 2.5% [2/80]；B型 = 5.6% [4/72]）和没有磁铁的过山车（A型 = 7.5% [3/40]；B型 = 2.8% [1/36]）上发生了变化。当暴露于摩天轮或在公园内行走时，两种阀门的设置均未改变。
磁控可编程阀门在暴露于具有垂直重力增强的游乐园游乐设施时，压力设置容易发生变化，无论是否存在LIM或磁制动。
