The trivalent valve is used in ECC circuits and fitted on the line intended for aspiration of the intracavitary blood coming from the operating field.
The trivalent valve is made up of two sealed plastic bodies.
A cylindrical-shaped silicone valve with one duck beak-shaped end is positioned inside it.
Thanks to the shape of the duck beak silicone valve positioned inside it, the trivalent valve guarantees that the blood passes through it in one direction only and absolutely prevents air from passing through in the opposite direction.
The cylindrical part of the silicone valve positioned inside the trivalent valve is attached to the PVC wall of the valve in which there is a cylindrical hole.
Thanks to its particular configuration, in the event that the duck beak valve closes (e.g. when the roller pump rotates in the wrong direction), the valve deforms to allow a small amount of blood to flow out of the device through dedicated holes thus reducing the excessive positive pressure.
In the event of excessive negative pressure in the suction line (e.g. when the aspirator comes into contact with the tissue wall), the valve deforms to allow a small amount of air to flow into the device, immediately bringing the negative pressure to physiological values.
The device is single-use, non-toxic, pyrogen-free, and is supplied sterile (sterilized by ethylene oxide).
INDICATIONS FOR USE
The trivalent valve is positioned between the roller pump and the intracavitary aspirator and must be considered a safety device for the following reasons:
• The silicone duck beak valve occludes preventing accidental inflow of air into the cardiac cavities (gaseous embolism). This condition occurs in the event of accidental inversion of the roller pump rotation direction, or if the pump segment is incorrectly installed i.e. not respecting the correct blood flow direction.
• In the event that the duck beak valve closes, it prevents excessive positive pressure which might determine damage to the pump segment or the connections.
• If the blood flow direction in the suction line is correct, it prevents excessive negative pressure.