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Figure 9: Pictorial representation of the Siphonguard®. Black arrows represent the direction of CSF flow from the proximal to distal end. The rectangular chamber with the ball-spring valve represents the low-resistance flow system and the spiral tube represents the high flow resistance system. (a) When the patient is recumbent, flow occurs via the low-flow resistance pathway. (b) When the patient is vertical, or when the flow exceeds 1ml/min, the ball-in-cone valve blocks the flow and all flow is diverted through the high-flow resistance pathway

Figure 9: Pictorial representation of the Siphonguard<sup>®</sup>. Black arrows represent the direction of CSF flow from the proximal to distal end. The rectangular chamber with the ball-spring valve represents the low-resistance flow system and the spiral tube represents the high flow resistance system. (a) When the patient is recumbent, flow occurs via the low-flow resistance pathway. (b) When the patient is vertical, or when the flow exceeds 1ml/min, the ball-in-cone valve blocks the flow and all flow is diverted through the high-flow resistance pathway