Every endovascular procedure begins the same way: establishing access to the vascular system through an introducer sheath. Although it may look like a simple tube, an introducer sheath is a small assembly of purpose-built components, each solving a specific problem — getting into the vessel smoothly, keeping blood from escaping, and providing a stable conduit for everything that follows. Understanding introducer sheath parts helps explain why this device looks the way it does.
What Role Does the Dilator Play?
The dilator is a tapered component inserted through the sheath before the assembly enters the vessel, smoothing the transition from the needle puncture to the sheath's full diameter and reducing resistance and trauma during insertion. Once the sheath and dilator are advanced into the vessel together, the dilator is withdrawn, leaving the sheath itself in place as the working conduit for the remainder of the procedure. Without this tapered lead-in, advancing a blunt-ended sheath directly into a vessel would be considerably more difficult and traumatic to the puncture site.
Why Does the Hemostasis Valve Matter?
The hemostasis valve sits at the proximal end of the sheath and is designed to minimize blood loss and prevent air entry while still allowing catheters, wires, and other devices to pass through the sheath's lumen. This valve typically uses a compressible seal that closes around whatever device is passed through it, maintaining a relatively controlled environment even as devices of varying diameters are inserted, exchanged, and withdrawn repeatedly during a single procedure.
What Is the Side Port For?
Most introducer sheaths include a side port — a small tubing extension near the proximal hub — that allows for continuous flushing with heparinized saline, contrast injection, or pressure monitoring without needing to remove whatever device currently occupies the main lumen. This feature helps reduce the risk of clot formation within the sheath during longer procedures and provides a convenient access point for various fluid or medication administration needs throughout the case.
How Do These Components Work Together in INVAMED's Invaducer System?
INVAMED's Invaducer Intraducer is built as a complete introducer sheath set, including a dilator, guidewire, syringe, and sheath, with the sheath itself incorporating a hemostasis valve and a proximal side port as described above. This all-in-one configuration is designed to provide the components needed for percutaneous catheter introduction with minimal blood loss in a single package. Additional details are available on the Invaducer product page, and the broader catheter and guidewire systems category can be reviewed on the invamed.com category page.
What happens if the side port is not used during a procedure?
The side port is generally used for flushing with heparinized saline to help reduce clot formation within the sheath, particularly during longer procedures. If not actively used for flushing, operators typically still monitor the sheath and access site according to standard procedural protocols.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.