Pacing Lead Tool Retainer for Preventing Stylet Pullback
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Solution Overview
Problem
Existing pacing lead systems face issues with the stylet being pulled proximally out of the lead lumen during implantation, compromising the ability to provide the necessary distal force for burrowing into tissue, due to the weight of the cap and cable components.
Innovation Solution
A pacing lead tool with a retainer mechanism that engages the stylet within the tool lumen to resist proximal movement, ensuring the stylet remains centered and effective in applying the required distal force for implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylet is inserted through the lead lumen to provide distal force for burrowing into tissue, then the ability to implant the pacing lead is improved, but the weight of the cap and cable components causes the stylet to be pulled proximally out of the lead lumen
Solution Approach 1:
The retainer mechanism is installed in advance within the tool lumen to counteract the proximal pulling force that will be exerted on the stylet by the weight of the cap and cable components during the implantation procedure. This preliminary protective measure prevents the stylet from being pulled out before it can perform its burrowing function.
Solution Approach 2:
The retainer acts as an intermediary component between the stylet and the tool body, providing a mechanical interface that transfers and resists the proximal pulling forces. This intermediary structure allows the stylet to remain securely positioned while still enabling the necessary distal force application for tissue penetration.
2Ease of operation
If the stylet is allowed to move freely in the tool lumen, then ease of insertion is improved, but the stylet cannot effectively apply distal force for burrowing into tissue
Solution Approach 1:
The retainer mechanism provides localized constraint at specific positions within the tool lumen, allowing the stylet to move freely in regions where freedom is needed for insertion, while providing mechanical resistance in regions where force application is needed for burrowing. This spatially differentiated approach optimizes both ease of operation and force application capability.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
Embodiments are disclosed of a pacing lead tool (100, 200). The pacing lead tool (100, 200) has a tool body (102) with a proximal body end (114), a distal body end (112), and a tool lumen (110) extending from the proximal body end (114) to the distal body end (112). The tool lumen (110) is adapted to receive a proximal lead end of a pacing lead (152), and is also adapted to receive a stylet (156) therein. A retainer (202, 300, 310, 400, 450, 500, 600, 700, 800, 900) is coupled to, or formed in, the tool body (110) and adapted to engage the stylet (156) when the stylet (156) is inserted in the tool lumen (110). The retainer (202, 300, 310, 400, 450, 500, 600, 700, 800, 900) substantially prevents proximal movement of the stylet (156) until a proximal force applied to the stylet (156) exceeds a threshold force.