Lateral-Oscillating Cutting Tip for Intravascular Lead Extraction
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Solution Overview
Problem
Current lead removal devices face issues with jamming or sticking of leads during extraction due to the compression of tissue plugs within the cutting tip, leading to increased friction and difficulty in removing implanted leads from the body.
Innovation Solution
An intraluminal cutting device with an offset blade cutting tip that oscillates laterally, allowing the effective cutting area to increase proportionately while keeping the material plug smaller than the inner diameter of the blade, reducing compression-related friction and the likelihood of jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cutting tip uses a conventional concentric design, then the structure is simple and easy to manufacture, but the tissue plug compresses against the inner wall causing increased friction and jamming
Solution Approach 1:
The cutting tip employs an eccentric/concentric offset design where the cutting blade rotates around an offset center rather than the geometric center. This asymmetric configuration creates a lateral oscillation motion that prevents the tissue plug from compressing against a single point on the inner wall, thereby reducing friction and preventing jamming while maintaining manufacturing feasibility
Solution Approach 2:
The cutting tip transforms from a static concentric design to a dynamic eccentric design that generates lateral oscillation during rotation. This dynamic motion allows the cutting blade to effectively cut through scar tissue while the offset center prevents continuous compression of the tissue plug against the inner wall, reducing friction and preventing jamming
2Productivity
If the cutting tip advances further into scar tissue, then lead extraction is more effective, but compression-related friction increases and jamming becomes more likely
Solution Approach 1:
The eccentric offset design creates asymmetric motion where the cutting blade describes an elliptical path rather than a circular one. This asymmetric oscillation ensures that the tissue plug is not compressed against a single location, allowing deeper advancement into scar tissue without proportionally increasing friction or jamming risk
Solution Approach 2:
The dynamic lateral oscillation generated by the eccentric rotation continuously changes the contact points between the tissue plug and cutting tip inner wall. This dynamic distribution of contact forces allows deeper cutting into scar tissue while preventing the buildup of compression-related friction that would otherwise limit extraction depth
Data Source
AI summary
An apparatus includes a lead removal device configured to be positioned within a blood vessel of a patient. The device includes a longitudinal axis, a first flexible elongate sheath extending along the longitudinal axis and comprising a cutting tip configured to cut tissue to separate a medical lead implanted in the tissue, and a second flexible elongate sheath extending along the longitudinal axis, wherein the first flexible elongate sheath is positioned inside the first sheath. The cutting tip is configured to have movement relative to the second flexible elongate sheath, including lateral motion in a plane perpendicular to the longitudinal axis.