Why Tubing Access Features Are Used
A shaft can carry several independent pathways, but each pathway must connect to a component, branch, fitting, or external line where the device architecture requires it. Access features expose or redirect those channels.
Their position and orientation should follow the lumen map. An access feature that is simple in isolation can become complex when adjacent , reinforcement, liners, or stiffness transitions occupy the same region.
Ported Tubing
A port creates an opening or branch associated with one or more lumens. Ports may be arranged radially around an assembly or linearly along it, and may connect to separate tubes, hubs, manifolds, or other components.
The port architecture should identify the targeted lumen, opening geometry, branch orientation, attachment method, and local support. A port does not by itself guarantee fluid sealing or pressure performance.
Skived Tubing
A skive is a longitudinal removal or cut that exposes a lumen or underlying tubing region. The cut can transition gradually back into the surrounding wall rather than ending as an abrupt step.
Skives may create access for a guidewire path, exit, individual lumen, or connection region. Cut depth, length, transition shape, remaining wall, and nearby layers should be defined for the actual construction.
Accessing Individual Lumens
In multi-lumen tubing, channels can differ in size, shape, position, and function. Tooling and fixturing must distinguish the intended lumen while avoiding unintended entry into neighboring pathways.
The lumen layout should provide adequate material for access and attachment. Inspection may need to confirm channel identity, opening condition, debris control, and continuity through the finished region.
Luer Connections
A luer connection can provide an external interface between tubing and another component. Male or female and slip or locking relationships are system choices governed by the selected component standard and device architecture.
The fitting may be bonded, mechanically retained, overmolded, or incorporated through another qualified assembly method. Tube and fitting dimensions, material compatibility, insertion depth, and load path influence the joint.
Connection and Sealing Considerations
A connection strategy may need to address fluids, pressure, air, electrical elements, or moving components. These needs lead to different sealing, isolation, strain-relief, and inspection methods.
Fluid-tight, pressure-capable, or hemostatic behavior should never be inferred from the presence of a port or luer alone. Those are device-level requirements requiring suitable components and representative evaluation.
Multi-Lumen Architecture
Access features should be coordinated from the initial multi-lumen cross-section through the final branch layout. Lumen spacing, walls, webs, port sequence, branch routing, labels, and connector orientation all contribute to usability and manufacturability.
Ports and skives also create longitudinal transitions. Their relationships with tapering, durometer changes, reinforcement termination, and catheter tipping should be reviewed across the shaft length.