Some of the most technically demanding work in endovascular medicine happens not in large vessels but in the smallest, most tortuous branches the vascular system has to offer — and that is precisely where microcatheters operate. Sized in the 1.5F to 3F range, these devices are designed to travel far beyond where standard catheters can reach, threading through winding anatomy to deliver therapy exactly where it is needed.
What Makes a Microcatheter Different From a Standard Catheter?
The defining feature of a microcatheter is its dramatically reduced profile compared to standard diagnostic or guiding catheters, allowing it to navigate vessels that would otherwise be inaccessible to larger devices. This small size is not simply a scaled-down standard catheter; microcatheters are engineered with construction techniques — often variable-stiffness shafts with a soft distal segment and firmer proximal portion — intended to balance trackability through tortuous anatomy with enough support to be advanced and controlled from outside the body.
What Is Superselective Access and Why Does It Matter?
Superselective access refers to the ability to navigate a catheter deep into small, distal branches of the vascular tree, often several branch points beyond where a standard catheter could travel. This capability matters clinically because many therapeutic goals — delivering an embolic agent precisely to a bleeding vessel, or infusing a liquid embolic into a small feeding artery of an abnormal vascular structure — depend on reaching a very specific, small target without affecting adjacent healthy tissue. Reaching that level of precision generally requires the smaller profile and steerability that only a microcatheter can offer.
How Are Microcatheters Used for Embolization and Drug Delivery?
Microcatheters are commonly used to deliver embolic agents, including liquid embolics and detachable coils, to precise locations for controlling bleeding, treating abnormal vascular connections, or occluding blood supply to certain lesions. They are similarly used for selective infusion of therapeutic agents directly at a target site, an approach intended to concentrate treatment where needed while limiting systemic exposure. Many microcatheter tips can also be shaped, often using a steam-shaping technique, to match the specific angle needed to enter a particular vessel branch.
What Does the MicroCATH Family Offer?
INVAMED's MicroCATH Neurovascular Catheter Family is designed as a comprehensive microcatheter lineup intended to support coiling, liquid embolic infusion, and distal neurovascular exploration, built for fine navigation through tortuous cerebral vessels. As with all microcatheter selection, the specific model and configuration used depends on target vessel anatomy and the therapeutic agent or device being delivered; institutions should consult current MicroCATH specifications and Instructions for Use. The broader catheter and guidewire systems category is available on the invamed.com category page.
Are microcatheters only used in neurovascular procedures?
No. While neurovascular applications are a prominent use case due to the tortuosity of cerebral vessels, microcatheters are also used in peripheral and visceral embolization procedures and for selective drug or contrast delivery in various vascular territories.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.