Multi-Lumen Tubing Dimensional Control Solution

A multi-lumen catheter is used to simultaneously perform multiple functions through a single insertion point, such as infusing fluids, drawing blood samples, or monitoring central venous pressure. Each lumen serves a distinct purpose, reducing patient discomfort and procedural risk. They are common in critical care, dialysis, chemotherapy, and other complex medical procedures.

'Multi-lumen' refers to a tube or catheter that contains multiple internal channels (lumens) within a single outer wall. Each lumen is an independent passageway. In manufacturing, precise air pressure must be maintained in each lumen during extrusion to achieve the correct internal geometry, outside diameter, and wall thickness.

A double lumen catheter has two independent channels, typically used for dialysis or simultaneous infusion and blood withdrawal. A triple lumen catheter has three channels, allowing three separate functions at once, such as fluid infusion, medication delivery, and pressure monitoring. Triple lumen catheters are more common in intensive care settings requiring multiple concurrent therapies.

MicroAir regulators supply precise ultra-low internal air pressure to each lumen during free extrusion, preventing collapse and maintaining accurate internal diameter and wall thickness. Units with 2, 3, or 4 independent channels allow each lumen to be controlled separately, with pressure ranges from 0–3 inches of water up to 0–5 psi.

On Line Controls offers MicroAir regulators in single, dual, 3-channel, and 4-channel configurations. Each channel can independently regulate pressure for a separate lumen, with its own pressure range and optional digital display. This allows manufacturers to precisely size complex multi-lumen profiles with full independent control over each internal passage.

Yes. MicroAir IV series units accept 0–10V analog input for direct PLC or automated controller connection, enabling programmable pressure switching for bump and taper tubing. MicroAir II series units accept contact closure inputs from O.D. diameter gauges or other controllers, allowing closed-loop feedback control of tubing outside diameter during extrusion.