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INT Medical Seldinger Needle

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INT Medical Seldinger Needle

Thin-Wall 304 Stainless Steel Vascular Access Needles in 18G and 21G, With and Without Wings

The INT Medical Seldinger Needle is a vascular access needle from INT Medical, designed for percutaneous arterial and venous puncture at the start of an interventional procedure. Featuring thin-wall 304 stainless steel construction, a large polished bore, a sharp tip for lower penetration force, and bevel-up orientation, in 18G and 21G sizes with or without wings, it delivers controlled vessel entry for guidewire passage. Available through Medigear.uk.

Sections

Interventional Consumables & Accessories

Categories

Cardiology Equipment

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

The INT Medical Seldinger Needle makes the first puncture in a percutaneous vascular procedure. Once the needle is in the vessel, a guidewire passes through its bore into the lumen. The needle is then withdrawn over the wire, leaving the wire in place, and a sheath or catheter is advanced over it. Everything that follows in the case depends on that first access being clean.

Three references are offered. SN03 and SN03A are 18G, measuring 1.20 mm outer diameter and 70 mm long. SN03 has wings on the hub, and SN03A does not. SN06 is 21G, at 0.80 mm outer diameter and 45 mm long, supplied without wings. All three use 304 stainless steel for the cannula. Note that 18G is normally associated with an outer diameter of 1.27 mm rather than the 1.20 mm quoted here, which is worth confirming on order.

INT specifies thin-wall construction with a large bore and a polished inner surface. Thin wall matters because it widens the bore without widening the puncture. A polished bore reduces friction as the guidewire passes, which lowers the chance of the wire catching. The tip is described as sharp, for lower penetration force, and the bevel is oriented upward relative to the hub. Bevel-up orientation lets the operator know which way the opening faces without inspecting the tip. One specification is absent from the sheet. Maximum guidewire diameter is not given, and it is the figure that determines whether a needle suits a given procedure.

Medigear.uk will obtain it from INT before supply, along with sterility and UK conformity.

The Seldinger technique underpins almost all catheter-based interventions. A needle punctures the vessel. A guidewire goes through the needle into the lumen. The needle is withdrawn over the wire. A sheath is then advanced over the wire into the vessel, and the wire comes out. The needle is used for seconds, but a poor puncture affects everything after it.

Access route drives the choice between references. Femoral access needs a longer needle, because the artery sits deeper below the skin, and it needs a bore wide enough for a standard 0.035 or 0.038 inch working wire. The 18G 70 mm references are sized for that. Radial access is shallower,r and the artery is much smaller, so a narrower, shorter needle is used and a fine wire follows. The 21G 45 mm reference belongs to that group.

Bevel orientation carries practical weight during the puncture. The guidewire leaves the needle in the direction the bevel faces, so bevel up directs the wire along the vessel rather than at the far wall. Knowing bevel direction from the hub alone means the operator does not have to check the tip mid-procedure. Winged hubs suit operators who want to brace the needle while advancing the wire, which is the moment access is most easily lost. Bore finish matters at the same moment, because a wire that snags can have its coating stripped. Central venous access follows the same needle-then-wire sequence.

Peripheral interventional radiology and diagnostic angiography both use the same needles. Medigear.uk supplies the instructions for use with every order.

Thin Wall Widens the Bore Without Widening the Puncture

More usable bore for the same outer diameter means a larger guidewire can pass through a smaller hole in the vessel wall.

Polished Inner Surface

A smoother bore reduces friction on the guidewire, lowering the chance of a snag at the moment access is most vulnerable.

Two Access Routes Covered

An 18G 70 mm option for femoral work and a 21G 45 mm option for radial and micropuncture technique come from the same range.

Winged and Plain Hub Options at 18G

SN03 and SN03A let a unit stock the hub style its operators prefer without changing supplier.

Bevel-Up Orientation Referenced to the Hub

Bevel direction can be read from the hub rather than the tip, which supports directing the guidewire correctly at puncture.

Sharp Tip for Lower Penetration Force

Less force at the tip means better control of the moment the needle enters the vessel, which reduces the risk of through-and-through puncture.

304 Stainless Steel Cannula

A widely used austenitic grade with the corrosion resistance and edge retention expected of a needle cannula.

Consolidated Supply Through Medigear.uk

Medigear.uk quotes the SN range alongside INT's sheaths, guidewires, manifolds and inflation devices on one account.

SN03, 18G With Wings

1.20 mm outer diameter, 70 mm long, winged hub.

SN03A, 18G Without Wings

1.20 mm outer diameter, 70 mm long, plain hub.

SN06, 21G Without Wings

0.80 mm outer diameter, 45 mm long, plain hub.

Thin-Wall Cannula

Wall thickness is reduced to maximise usable bore.

Large Bore

The internal passage is sized to carry a guidewire through to the vessel.

Polished Inner Surface

The bore is finished to reduce friction against the guidewire.

Sharp Needle Tip

Tip geometry is specified for lower penetration force.

Bevel Up Orientation

The bevel faces a known direction relative to the hub.

304 Stainless Steel Construction

The cannula is made from high-quality 304 austenitic stainless steel.

70 mm Length for Femoral Access

Both 18G references reach the depth femoral puncture requires.

45 mm Length for Radial Access

The 21G reference is sized for shallower, smaller vessels.

Winged Hub Option

SN03 provides wings for bracing during guidewire advancement.

The INT Medical Seldinger Needle covers the two access routes most interventional lists rely on, with 18G 70 mm references for femoral puncture and a 21G 45 mm reference for radial and micropuncture work. Thin-wall 304 stainless steel construction, a polished bore, a sharp tip and bevel-up orientation address the things that actually matter at the moment of vessel entry. Medigear.uk supplies the range to UK cardiac catheter laboratories and interventional radiology suites, alongside the sheaths, guidewires and access accessories used with it. Before supply, Medigear.uk will confirm the maximum guidewire diameter for each reference, inner diameter, sterility and single-use status, shelf life, box quantity, packing dimensions in LBH mm, and UK conformity status.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

It makes the initial percutaneous puncture in vascular access. The operator advances the needle into the artery or vein, confirms entry by blood return, then threads a guidewire through the bore. The needle comes out over the wire and a sheath goes in. It is the first step of the Seldinger technique. Medigear.uk supplies the range to UK catheter laboratories.

The sheet does not say, and this is the specification a laboratory most needs. Comparable manufacturers publish it as a headline figure. By general convention an 18G thin-wall needle passes wires up to about 0.038 inch, while 21G is normally limited to roughly 0.018 to 0.021 inch. Medigear.uk will obtain INT's own stated figures rather than rely on convention.

Wings only. Both are 18G at 70 mm. SN03 has wings on the hub and SN03A does not. Wings give something to hold against while the guidewire is threaded, which some operators prefer and others find gets in the way. Medigear.uk can supply both so a unit can settle its preference before standardising.

Size and access route. The 21G needle is narrower and shorter, at 0.80 mm and 45 mm, which suits radial access and micropuncture technique where a smaller entry is wanted. The 18G references at 70 mm suit femoral access, where more depth is needed. The trade-off is guidewire size. Medigear.uk can quote both.

Two separate things. Thin wall gives a wider inner bore for a given outer diameter, so a larger guidewire passes through a smaller puncture. A polished inner surface reduces friction on the wire as it advances. That lowers the chance of the wire snagging, which matters because forcing a snagged wire can damage its coating.

The bevel faces the same way as a fixed reference on the hub. The operator therefore knows which direction the opening points without looking at the tip. That matters during the Seldinger technique, because the guidewire exits in the direction the bevel faces. Bevel up at puncture directs the wire along the vessel rather than into the far wall.

It is a widely used austenitic stainless steel for needle cannulas, valued for corrosion resistance and the ability to hold a ground edge. INT specifies it as high quality 304. Grade alone does not describe tip geometry or finish, which affect penetration force just as much. Medigear.uk can request the tip specification for a technical file.

None of the three is confirmed in the material supplied. Needles of this class are normally single use and supplied sterile, but INT's sheet does not state either. No CE or UKCA marking information is given. Medigear.uk will establish sterility, sterilisation method, single-use status, shelf life, and UK conformity before supply.