Company insight
Navigate, cross, support: Engineering the right guidewire for the task
Alleima is advancing in the medical field with smaller, smarter and more flexible nitinol-based solutions engineered to support the growth of minimally invasive procedures.
ompared with open surgery, minimally invasive procedures are designed to reduce trauma, shorten recovery and lower procedural risk. They also require clinicians to navigate complex anatomy through small access points, often using guidewire and catheter-based systems inside vessels or other narrow pathways. Guidewires may look simple, but their performance depends on a carefully engineered combination of material, geometry, coating and tip design. Performance priorities change with each task. The key is to combine and balance properties for the intended application. Sensor integration can further enhance navigation and real-time procedural decision-making. Sensor wires and modules integrated into guidewires can measure flow, pressure, temperature and biochemical markers.
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“Having accurate, reliable sensing integrated into the tools clinicians already use can be a real step-change in procedural control and safety,” says Dr Cacie McDorman, global product manager, wire technologies at Alleima’s medical unit.
Flexibility where it matters When navigating complex vascular anatomy, flexibility, lubricity and kink recovery are
essential. A superelastic nitinol core combines flexibility with kink resistance and shape recovery, helping the guidewire follow challenging vessel paths while maintaining its functional shape.
Core tapers also play an important role. A long, gradual taper can create an extended flexible distal segment with low tip load, supporting atraumatic navigation. Angled or shapeable tips can help steer into branch vessels, while a J-shaped tip can support atraumatic navigation through main vessels. Coating and visibility are equally important. Hydrophilic coatings reduce friction and create a smooth surface when they come into contact with saline or blood, helping the guidewire glide through vascular anatomy. Alleima uses a tungsten-containing coating to provide radiopacity along the guidewire, while marker bands can provide visibility in selected sections.
Precision, control and response Crossing a lesion places different demands on a guidewire. Here, torque response, directional control and controlled tip force come to the forefront. Nitinol remains well suited to the task, but the core design can be optimised to deliver greater torsional stiffness and column strength. Torqueability is particularly important.
Guidewires may look simple, but their performance depends on a carefully engineered combination of material, geometry, coating and tip design.
With a single nitinol core wire, rotation applied at the proximal end transfers almost 1:1 to the distal end, enabling precise, predictable steering. Low rotational lag gives the operator greater directional control when positioning the wire. The coating can also be tailored. A hydrophilic working section supports low- friction crossing, while a shorter uncoated or less-lubricious distal section can provide greater tactile feedback. Clear radiopacity at the tip and lesion interface supports visibility under fluoroscopy.
Creating a stable platform Once access is achieved, the guidewire may need to support device advancement and delivery. For support guidewires, shaft stiffness, pushability and device-delivery stability become more important. The proximal and middle sections of the nitinol core can be designed for greater stiffness, while flexibility is concentrated in a shorter distal segment. A hydrophobic PTFE coating on the proximal or body section can provide controlled device advancement and stronger tactile feedback, while an optional hydrophilic distal section can aid positioning.
Early collaboration is critical “By engineering the nitinol core, radiopacity, torque response, coating, taper and tip geometry around the intended task, Alleima can tailor guidewire performance to specific application requirements,” says Xavier Robin, engineering manager at Alleima’s medical unit.
“Manufacturing these guidewires requires specialised processes, very tight tolerances and robust quality controls to ensure consistency at scale,” McDorman adds. “Early collaboration plays a critical role in achieving these goals.” ●
www.alleima.com/medical
www.medicaldevice-developments.com 65
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