Snaring System for Pacing Lead Extraction
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Solution Overview
Problem
Current methods for removing pacing leads from patients are inadequate, as they often fail to effectively grasp and manipulate free ends of leads, leading to difficulties in accessing and extracting them without causing damage or obstruction.
Innovation Solution
A snaring system is introduced that includes a snare wire with a hooked distal end, roller bearings, and a deflection mechanism, allowing for the grasping and manipulation of pacing leads within the patient's body without applying excessive force, enabling the lead to be pulled back through a jugular or femoral access site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pig tail catheters are used to grasp and remove pacing leads, then the catheter can be inserted through the patient's anatomy, but the lead may slip out of the catheter before it is freed from the patient's anatomy
Solution Approach 1:
The snare wire is designed with a dynamic loop configuration that can expand and contract. The loop expands to engage the pacing lead and contracts to secure it, providing both reliable holding capability and ease of manipulation through dynamic adaptation to the lead's position and shape
Solution Approach 2:
The snare wire acts as an intermediary between the operator and the pacing lead. It provides a mechanical interface that translates operator manipulation into secure engagement with the lead, solving the problem of lead slippage while maintaining ease of operation
2Productivity
If excessive pulling force is applied to remove the pacing lead, then the lead can be extracted from the patient's body, but the lead or surrounding vasculature may be damaged
Solution Approach 1:
The snare system provides dynamic force distribution through its loop configuration and roller bearing mechanism. The roller bearing allows the snare to roll along the lead rather than slide, distributing pulling forces over a larger area and reducing stress concentration that could damage the lead or vasculature
Solution Approach 2:
The system incorporates a roller bearing that acts as a cushioning element between the snare wire and the pacing lead. This roller bearing reduces friction and distributes mechanical stress before excessive forces are applied, preventing damage to the lead or surrounding vasculature during extraction
3Shape
If the snare wire is made rigid to maintain its shape for grasping, then it can effectively engage the lead, but it cannot navigate the tortuous pathway to the superior vena cava
Solution Approach 1:
The snare wire is designed as a segmented or modular structure that allows it to navigate tortuous pathways while maintaining its grasping configuration. The wire can flex and conform to the vasculature's shape during navigation, then maintain its loop shape for effective lead engagement
Solution Approach 2:
The snare wire utilizes flexible material properties to navigate the tortuous pathway to the superior vena cava. The wire's flexibility allows it to conform to the body's anatomy during insertion, while its structural design maintains the necessary shape for grasping the pacing lead
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The snaring system effectively grasps and removes pacing leads with significant pulling forces while minimizing stress on the lead and surrounding vasculature, allowing for safe and reliable extraction without causing further complications.
Implementation Method 1
The roller bearing can reduce friction between the snare wire and the pacing lead, thereby facilitating translation of the snare along the lead
Data Source
AI summary
Snaring systems and methods involve engaging objects such as pacemaker pacing leads within a patient. Physicians can use snaring systems having loops, tags, and roller mechanisms to remove a pacing leads from a patient. For example, snaring systems can be inserted through a jugular access site, engaged with a pacemaker pacing lead, and withdrawn through the jugular access site so as to remove a portion of the pacing lead. Lead extraction techniques can be employed to further dislodge the pacing lead from the patient.