Interventional Retrieval Tool Radial Offset Guide
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Solution Overview
Problem
Existing retrieval tools for implanted cardiac pacemakers often face issues with mechanical and MRI compatibility, and struggle with efficiently retrieving the device from implant sites due to the device 'hanging up' on the catheter sidewall during retrieval.
Innovation Solution
A retrieval tool with a guide that includes a lasso and a tapered sidewall forming a radial offset between the distal opening of the guide lumen and the catheter receptacle, preventing the snared device from catching on the catheter sidewall, and a movable lasso segment for adjustable loop sizes to facilitate smooth retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional snare tool is used with a catheter for retrieving the implanted device, then the device can be snared, but the device may hang up or catch on the distal-most sidewall of the catheter at the distal opening of the receptacle during retrieval
Solution Approach 1:
The guide acts as an intermediary component between the catheter and the snare tool. It provides a radial offset that prevents the snared device from directly contacting the distal-most sidewall of the catheter, thereby eliminating the hanging up issue while maintaining the snaring function
Solution Approach 2:
The guide introduces a radial dimension offset between the snare tool's distal opening and the catheter's distal opening. This radial separation creates a clear path for device retrieval without interference from the catheter sidewall
2Adaptability or versatility
If a fixed-size lasso is used, then the structure is simple, but it cannot accommodate different implant sites and device sizes
Solution Approach 1:
The lasso is designed with movable segments that allow dynamic adjustment of the loop size. The second segment can slide relative to the first segment, enabling the operator to expand or contract the loop to match different device sizes and implant site requirements
Solution Approach 2:
The lasso is divided into multiple segments (first segment and second segment) that can move relative to each other. This segmentation allows independent adjustment of the loop configuration while maintaining structural integrity
Data Source
AI summary
A tool operable with a catheter in an interventional medical system retrieves a medical device from an implant site, wherein the device includes an attachment feature that forms an annular recess to be engaged by a lasso of the tool for snaring the device, and a distal-most sidewall of the catheter defines a receptacle into which the snared device is retrieved. A guide of the tool includes a sidewall defining a lumen in which the lasso extends for deployment out from a distal opening thereof, to snare and retrieve the implanted device. The sidewall establishes a radial offset between the guide lumen distal opening and the distal-most sidewall of the catheter, when the guide lumen distal opening and a distal opening of the receptacle are located in close proximity to one another, which radial offset is greater than a length of the annular recess formed by the device attachment feature.