Introduced in 1987, the Orbis-Sigma valve was the first valve to manage hydrocephalus through flow regulation rather than conventional differential pressure regulation. The valve operates a 3-stage variable resistance mechanism that regulates flow through the valve at a rate close to that of CSF secretion (about 20 ml/h).
The Unified Valve System – with Ventricular Catheter contains:
Valve options with or without prechamber and integrated plastic connector
Unified 110cm Open Stripe Drainage Distal Catheter
Straight polypropylene connector
Luer connector
Right angle guide
15 cm straight ventricular catheter
Introducer rod