Endovascular Tip Counterbore for Radiopaque Marker Retention
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Solution Overview
Problem
Endovascular devices face challenges in accurate positioning within the body due to the difficulty in incorporating a radiopaque marker without altering the inner diameter of the device tip, which is critical for maintaining the passage of a guidewire and ensuring smooth insertion.
Innovation Solution
A method involving counterboring the distal end of the tubular device tip to create a larger internal diameter for a radiopaque marker, which is then securely positioned within the counterbore by deforming the tip to retain it, ensuring the inner diameter of the primary bore remains constant for guidewire passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radiopaque marker is incorporated into the tip of an endovascular device, then the positioning accuracy and visualization during the procedure is improved, but the inner diameter of the tip may be altered which compromises guidewire passage
Solution Approach 1:
The radiopaque marker is nested within a counterbore cavity created in the distal tip. The counterbore provides a larger internal diameter space that accommodates the marker device while the outer surface of the tip remains unchanged, preserving the original inner diameter for guidewire passage. This nesting approach allows the marker to be housed without altering the critical dimensions of the tip.
Solution Approach 2:
Instead of placing the marker in the radial dimension which would reduce the inner diameter, the marker is positioned in the longitudinal dimension by creating a counterbore that extends into the tip material. This dimensional transition allows the marker to occupy space along the length of the tip rather than reducing the cross-sectional inner diameter, thereby maintaining guidewire compatibility.
2Ease of manufacture
If the inner diameter of the tip is increased to accommodate a marker, then the marker can be positioned within the tip, but the smooth passage of a guidewire is compromised
Solution Approach 1:
The marker device is nested within the counterbore cavity, which is itself nested within the tip structure. This hierarchical nesting allows the marker to be incorporated without protruding into the guidewire passage path, ensuring smooth guidewire passage while maintaining ease of marker incorporation through the counterbore structure.
Solution Approach 2:
The counterbore creates a localized region of larger internal diameter specifically for housing the marker, while the remainder of the tip maintains its original inner diameter and smooth surface characteristics. This localized modification allows marker incorporation without affecting the overall guidewire passage properties of the tip.
3Ease of manufacture
If a counterbore is created in the distal end of the tubular tip, then a marker can be retained within the tip, but the structural integrity of the tip may be compromised
Solution Approach 1:
The counterbore creates a nested cavity structure within the tip that houses the marker. By nesting the marker within this controlled cavity rather than creating a through-hole or surface attachment, the tip material surrounds and supports the marker, distributing stresses and maintaining structural integrity while enabling marker retention.
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
This approach allows for precise positioning of the device using radiopaque markers without compromising the inner diameter, facilitating smooth insertion and visualization during medical procedures while maintaining a smooth outer surface for easy passage through the body.
Implementation Method 1
deforming a portion of the tubular tip extending distally beyond the second end of the marker device to retain the marker device within the counterbore
Data Source
AI summary
An endovascular device tip assembly and method of making the same, incorporating a radiopaque marker usable with catheters and other suitable endovascular devices is provided. The tip assembly incorporates a radiopaque marker device by providing a counterbore within a primary bore of a tubular tip of an endovascular device. The marker device is fitted securely within the counterbore and the tubular tip is further deformed distally of the marker in order to secure the marker within the device.