ASAHI SION® Blue: Clinical Profile, Specifications and the SION Family Compared

The SION family sits at the centre of Asahi Intecc's coronary guidewire portfolio — the category defined by predictable workhorse performance rather than specialised CTO penetration or extreme hydrophilicity. All three variants (SION, SION Blue, SION Black) are built on the ACT ONE (Asahi Composite Technology ONE) architecture: a tapered stainless-steel core that transitions into a coil-wound distal segment, fused at the junction to create a single continuous construction rather than a mechanically joined assembly.

This construction delivers what interventionalists describe as 1:1 torque response — rotation applied at the hub is transmitted with minimal lag or magnification to the tip, allowing deliberate, controlled steering in tortuous anatomy. The coil-wound distal segment provides radiopacity without adding stiffness, and the taper geometry is calibrated so the wire tracks through curves without kinking. The result is a platform that gives operators consistent feedback across a wide range of coronary anatomies.

ASAHI SION® Blue was developed to address a specific procedural need: atraumatic first-pass access to fragile or geometrically challenging targets where the standard SION's tip force, while balanced for workhorse use, risks ostium trauma or inadvertent wire escalation. By reducing tip load to approximately 0.5 gf — roughly 30% below the standard SION at 0.7 gf — SION Blue enters a small-calibre side branch or a tortuous distal segment with a lighter touch while retaining every other property of the ACT ONE shaft.

The practical implication is that SION Blue does not sacrifice torque response or shape retention for softness. The shaft behaves identically to the standard SION; only the distal tip force is reduced. This preserves the operator's ability to steer and re-wire, which matters in bifurcation PCI where the side-branch wire must be repositioned after main-vessel stent deployment.

The three SION-family wires are distinguished primarily by tip load, which determines how aggressively the wire engages lesion tissue on first contact. SION Blue (≈ 0.5 gf) is the softest, suited to fragile side branches, small distal vessels, and situations where ostium preservation is critical. The standard SION (≈ 0.7 gf) covers the widest range of workhorse applications — it is the most referenced coronary guidewire comparator in peer-reviewed PCI literature precisely because its balanced tip force suits the majority of cases. SION Black (≈ 0.8 gf) adds a further step of tip force for moderately resistant lesions, bridging the gap between workhorse and dedicated CTO wires without requiring a full wire escalation.

Choosing between them is a matter of anatomical target. Side-branch access in bifurcation PCI and tortuous distal wiring favour SION Blue. Straight-forward workhorse cases favour the standard SION. Lesions with mild resistance that do not yet warrant a CTO wire are best approached with SION Black.

ASAHI SION® Blue has a 0.014 inch (0.36 mm) outer diameter, consistent with the vast majority of coronary guidewire-compatible equipment. Usable length is available in 180 cm (standard) and 300 cm (exchange length). Tip load is approximately 0.5 gf. The distal 20 cm is a coil-wound segment; within this, the distal 3 cm is radiopaque. Coating covers a 42 cm zone from the tip, combining a silicone layer proximally with a hydrophilic tip section — providing tactile friction feedback in the mid-shaft while reducing resistance at the very tip for initial lesion engagement.

Tip shapes available are straight and J, across both length options, giving four catalog configurations in total. The silicone + hydrophilic combination coating is a distinguishing feature relative to fully hydrophilic wires: the controlled friction profile makes SION Blue suitable for active wire management rather than passive advancement, which is important in bifurcation techniques where the side-branch wire must be held in position under balloon pressure.

ASAHI SION® Blue is supplied under the following Asahi Intecc catalog numbers: AHW14R004S (straight tip, 180 cm), AHW14R304S (straight tip, 300 cm), AHW14R004J (J tip, 180 cm), and AHW14R304J (J tip, 300 cm). The 300 cm exchange-length variants are used in cases requiring over-the-wire device exchanges without removing the guidewire — common in complex multi-lesion PCI or procedures using extended-reach balloon catheters.

Bifurcation PCI is the most common application for SION Blue. During a provisional or two-stent bifurcation approach, the side branch is typically protected with a guidewire before main-vessel stenting. The softer SION Blue tip reduces the risk of ostium injury during initial side-branch wiring and is well-tolerated when jailed under the main-vessel stent — the wire can usually be retrieved and re-crossed through stent struts into the side branch for final kissing-balloon inflation.

Tortuous distal vessels represent a second key indication. In patients with elongated, angulated coronary anatomy — particularly in the right coronary artery or circumflex territory — a lower tip force reduces prolapse risk as the wire negotiates sharp bends. The ACT ONE shaft ensures that despite the softened tip, the operator retains steering control rather than simply pushing the wire and hoping it tracks.

Fragile or small-calibre branches, such as diagonal vessels in the LAD territory or obtuse marginals, also benefit from SION Blue's reduced tip force when accurate first-pass placement is more important than penetrating force.

Modern Medical Solutions is the authorised Asahi Intecc distributor for Tajikistan and Afghanistan, supplying the full SION family — SION, SION Blue, and SION Black — to interventional cardiology centres across both countries. Documentation requests, catalog availability confirmations, and ordering enquiries can be submitted through the contact form on the ASAHI SION® Blue product page.

For institutions outside Tajikistan and Afghanistan, ASAHI SION® Blue is available through Asahi Intecc's global distributor network. Reference source: medical.asahi-intecc.com.