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Figure 1: The Z flow shunt (a) When the patient is standing upright, with chances of overdrainage of the cerebrospinal fluid, the stainless steel weighting spheres press on a sapphire ball, which closes the cerebrospinal fluid flow aperture. This increases the shunt's opening pressure and prevents overdrainage of cerebrospinal fluid. (b) In the lying down position of the patient, the stainless steel spheres moved away from the sapphire ball, and the opening pressure of the valve becomes nearly zero mm Hg, thus opening the shunt aperture and facilitating the cerebrospinal fluid drainage. (c) The actual photograph of the shunt valve of the Z flow shunt

Figure 1: The Z flow shunt (a) When the patient is standing upright, with chances of overdrainage of the cerebrospinal fluid, the stainless steel weighting spheres press on a sapphire ball, which closes the cerebrospinal fluid flow aperture. This increases the shunt's opening pressure and prevents overdrainage of cerebrospinal fluid. (b) In the lying down position of the patient, the stainless steel spheres moved away from the sapphire ball, and the opening pressure of the valve becomes nearly zero mm Hg, thus opening the shunt aperture and facilitating the cerebrospinal fluid drainage. (c) The actual photograph of the shunt valve of the Z flow shunt