Surgical Cutting Device Shield Drive Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lead extraction devices face challenges in removing implanted cardiac pacing system leads due to scar tissue formation and attachment to vascular walls, making precise control and efficient separation difficult, especially in tortuous vascular environments.
Innovation Solution
A surgical device with an intermediate sheath assembly, inner sheath assembly, and outer sheath assembly that includes a cutting tip and shield mechanism, allowing for controlled rotation and translation of the cutting tip to separate tissue from the lead, with a cam and follower mechanism for adjusting the cutting tip's position relative to the outer shield, facilitating safe removal of implanted objects from the body vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cutting device is used to separate lead from tissue, then separation efficiency is improved, but risk of damaging vascular wall increases
Solution Approach 1:
The outer shield acts as an intermediary protective barrier between the cutting device and the vascular wall. It allows the cutting tip to rotate and separate tissue from the lead while preventing direct contact between the cutting device and the vascular wall, thus enabling efficient separation while reducing damage risk
Solution Approach 2:
The device is segmented into multiple functional components: the outer shield for protection, the intermediate sheath assembly for positioning, the inner sheath assembly for cutting tip rotation, and the cutting tip itself. This segmentation allows independent optimization of each component's function to achieve both efficient cutting and safety
2Ease of operation
If the cutting tip is exposed to access tissue, then separation capability is improved, but safety control is worsened
Solution Approach 1:
The cutting tip's position is dynamically controlled through the cam and follower mechanism, allowing it to move between exposed and protected positions. This dynamic control enables the cutting tip to be exposed when tissue separation is needed while being retracted when safety control is required
Solution Approach 2:
The cam and follower mechanism acts as an intermediary control system between the operator's actions and the cutting tip's position. It provides precise mechanical control over the cutting tip's exposure and retraction, enabling safe and controlled separation operations
3Ease of manufacture
If the device structure is simplified, then ease of manufacture is improved, but control precision is worsened
Solution Approach 1:
The cam and follower mechanism serves as a mechanical intermediary that translates simple rotational motion into precise linear positioning of the cutting tip. This intermediate mechanism achieves precise control without requiring complex electronic or mechanical systems
Solution Approach 2:
The patent uses pure mechanical elements (cam profiles, followers, springs) to achieve precise control of the cutting tip position and rotation. This mechanical substitution approach provides accurate control while maintaining relative simplicity in device construction and manufacturing
Data Source
AI summary
Devices for removing implanted objects from body vessels are provided. A device includes a sheath assembly having a cutting tip. The cutting tip includes a cutting surface that is adapted to cut tissue coupled to an implanted object as the cutting tip rotates. The sheath assembly further includes an outer shield carried outside of the cutting tip. The outer shield includes a distal opening, and the outer shield is translatable relative to the cutting tip from a first position to a second position and vice versa. In the first position the cutting surface of the cutting tip is disposed within the outer shield, and in the second position the cutting tip extends through the distal opening and the cutting surface is at least partially disposed outside of the outer shield.