Opposing Roller Wheels for Axial Shaft Positioning

The patent replaces the traditional mechanical cutting system with a friction-based abrasion system. Instead of using rotating blades that cut through plaque and vessel walls, the invention employs an abrasive element that contacts the plaque-coated shaft surface. The abrasive material (such as diamond or ceramic particles) gradually wears down the plaque through friction and abrasion as the shaft rotates, eliminating the need for sharp cutting edges that can perforate or tear the vessel.

The patent introduces an abrasive element as an intermediary between the rotating shaft and the plaque. This abrasive layer acts as a mediator that transfers mechanical energy to remove plaque through controlled abrasion rather than direct cutting. The abrasive particles are embedded in or applied to the shaft surface, creating a buffer zone that prevents direct contact between the shaft and plaque, thereby reducing vessel damage while maintaining effective plaque removal.

The patent replaces the complex mechanical cutting mechanism with a simpler friction-based abrasion system. The abrasive element requires only rotational motion to function, eliminating the need for complex blade actuation mechanisms, depth control systems, and cutting force regulation. This simplification makes the device easier to control and operate, reducing the learning curve and operational risks for operators.

The abrasive element operates through self-regulating friction-based abrasion. As the shaft rotates, the abrasive automatically contacts and removes plaque through friction, with the removal rate naturally regulated by the contact pressure and rotation speed. The system self-adjusts to the plaque characteristics without requiring complex feedback control mechanisms, making the device more intuitive and easier to control during procedures.