Miethke miniNAV - Smallest Differential Pressure Valve

The figure shows a schematic drawing of the miniNAV. The valve consists of a stable titanium housing with an integrated ball-cone valve. A spiral spring determines the opening pressure of the ball-cone valve. The sapphire ball guarantees a precise closure. A connector or a silicone catheter can be connected to the distal end of the valve. The connecting nozzles for the inlet and outlet are also made of titanium.

The illustration below shows the miniNAV and how the valve works: If the ball-and-cone valve is closed, CSF drainage is not possible. If the intraventricular pressure increases, this force acts on the ball-cone valve and finally causes the spring to give way and a gap to form between the cone and the ball, which now allows the cerebrospinal fluid to flow.

• smallest differential pressure valve with reliable drainage control for the treatment of hydrocephalus, especially in premature and newborn babies or lying patients
• very small, slim, cylindrical design for easy implantation
• MRT compatible up to 3 Tesla
• precise precision engineering
• robust and durable due to the use of titanium