DESCRIPTION

The OSV II Flow Control Valves by Codman (now owned and distributed by Integra Lifesciences) is a CSF shunt valve with a flow regulation self-adjusting valve that works to maintain a constant flow rate despite changes in differential pressures caused by postural and vasogenic changes. This is done by a membrane that is pushed up or down based on differential pressure to maintain a stable flow. Flow is maintained by 3 stages of differential pressure:

• Stage 1: Low differential pressure flow is maintained at 5-20ml/hr 
• Stage 2: Flow Regulation at around 20ml/hr when pressure is between 120 and 300 mmH2O
• Stage 3: Pressure Relief Mode. Increased differential pressure causes increased flow up to 40ml/hr

Valve is available in several forms:  

• standard OSV II
• OSV II Low profile
• OSV II NPH Low Flow (functions at a lower flow rate of 10ml/hr at standard pressure range)

Other Features:

• MRI compatible (no moving parts)
• No imaging artifact
• Postural control of vasogenic overdrainge
• No need for programming

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