Mechanical Spring-Loaded Pinch Roller Device for Precision Guidewire Torque Transmission in Endovascular Procedures

Abstract

Endovascular procedures require controlled guidewire manipulation; however, manual torque devices often cause inconsistent rotation, slippage, and operator fatigue [1]. These limitations can lead to procedural delays and complications. Surgeon surveys and stakeholder interviews show clinical need for improved torque precision, reduced fatigue, and safer wire handling. There are over 1 million annual endovascular procedures; demand for minimally invasive interventions is growing [2]. The market needs affordable, ergonomic accessories. The mechanical geometry-based torque device meets these criteria. Replacing manual twisting, this design uses a tube with spiral grooves and an internal wire holder that transfers rotational torque to the wire. When the button is pressed, its attached pin moves through these grooves, forcing the tube to rotate. When released, a spring pushes the button and pin back to their original position, ready for the next press. Technical specifications secure torque transfer ≥ 2.0 N·cm and spring stiffness between 0.05 – 0.08 N·cm/degree. The pinch-roller friction coefficient must be ≥ 0.8 to prevent slippage, while the 9 – 11 cm casing supports one-handed use. The design for manufacturing lets for low-cost production using injection-molded components and stainless-steel springs. The estimated per-unit cost is $4 – $7. Medical-grade ABS and silicone were selected for durability, biocompatibility, and autoclave sterilization. These parameters guarantee performance and alignment with ISO 11070, ISO 14971, and FDA 510(k) regulations [3][4][5]. By improving workflow and reducing fatigue, this design can shorten procedure times and improve patient safety, offering a pathway for rapid clinical adoption.

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