Outward-Chamfer Cutting Tips for Low-Friction Implanted Lead Removal

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Solution Overview

Problem

Current lead removal devices face issues with jamming and sticking due to the inward chamfer design of the cutting tip, which causes compression and increased friction, making it difficult to extract implanted leads from the body.

Innovation Solution

The cutting tip is designed with an outward chamfer, offset blade, and inner taper to minimize tissue compression, ensuring the cut tissue diameter matches or exceeds the inner diameter of the lumen, reducing friction and preventing jamming.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If an inward chamfer design is used on the cutting tip, then the cutting blade can effectively cut through scar tissue, but the cut tissue is compressed and friction increases causing jamming

Engineering Contradiction:

Improvecutting efficiencyVSAvoidjamming prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent inverts the traditional inward chamfer design by using an outward chamfer design on the cutting tip. This inversion allows the cut tissue to be pushed outward rather than compressed inward, eliminating the friction and jamming problems while maintaining cutting effectiveness through the outwardly directed cutting edges.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the geometric parameters of the cutting tip by transitioning from an inward chamfer to an outward chamfer configuration. This parameter change fundamentally alters how tissue is handled during cutting, preventing compression and subsequent jamming while preserving the cutting function through properly oriented cutting edges.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the inner diameter of the lumen is made smaller to reduce device size, then the device becomes more compact, but tissue compression increases leading to higher friction

Engineering Contradiction:

Improvedevice compactnessVSAvoidtissue compression friction

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

Instead of reducing the lumen diameter to achieve compactness (which would increase compression), the patent uses an outward chamfer design that allows the lumen to maintain a larger effective diameter. The cutting edges are positioned outwardly, enabling tissue to be pushed outward without compression, thus achieving both compactness and reduced friction simultaneously.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20250248731A1Blade chamfer and/or taper on cutting tip for implanted lead removal with minimized tissue compression

Publication Date: 2025.08.07 KONINKLIJKE PHILIPS NV

AI summary

A lead removal device includes a flexible elongate member configured to be positioned within a blood vessel of a patient, and a cutting tip positioned at the distal portion of the flexible elongate member and configured to rotate. The cutting tip includes: a blade configured to cut tissue associated with the blood vessel for removal of an electrical lead implanted in the tissue from a body of a patient, an outer wall surface defining an outer diameter, and an inner wall surface defining a lumen with an inner diameter, wherein the lumen is configured to receive the electrical lead and the tissue cut by the blade. The cutting tip has an outward chamfer such that a cutting edge of the blade is aligned with the inner wall surface, and the inner diameter matches the diameter of the tissue cut by the blade and entering the lumen.