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).
System content:
Valve with antechamber
5 cm proximal tube and 110 cm unified distal open stripe drainage catheter
80 cm closed tip lumbar catheter
Tuohy Needle 14G Downward Polypropylene Connector
Luer connector
suture clamp
Straight polypropylene connector