Segmented Magnetic Stylet for Vascular Navigation
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Solution Overview
Problem
Existing stylets used for navigating catheters and cannulas within patients lack sufficient stiffness and flexibility, making it difficult to traverse complex vascular paths effectively.
Innovation Solution
A stylet with an elongated body comprising a magnetic material, a core element, and a tubular member, where the magnetic material is circumferentially disposed about the core element and retained within the tubular member, providing adjustable stiffness and flexibility through the use of gaps and reinforcing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stylet is made rigid to provide sufficient stiffness for catheter navigation, then the catheter can be placed more effectively, but the stylet loses flexibility needed to traverse complex vascular paths
Solution Approach 1:
The stylet is segmented into multiple regions with different stiffness characteristics. The proximal region has higher stiffness for structural support and catheter placement, while the distal region has lower stiffness for navigating complex vascular paths. This segmentation allows the stylet to simultaneously provide both rigidity and flexibility in different sections.
Solution Approach 2:
Different portions of the stylet are given different mechanical properties. The proximal end maintains higher rigidity to support catheter insertion and positioning, while the distal end is designed with greater flexibility to navigate tortuous blood vessels. This local differentiation of material properties resolves the contradiction between overall stiffness and local flexibility.
2Measurement precision
If a stylet is made fully magnetic for tracking purposes, then navigation precision is improved, but the stylet becomes too flexible to maintain rigidity when needed
Solution Approach 1:
Magnetic material is applied selectively to specific regions of the stylet rather than uniformly throughout. The magnetic material is concentrated in the distal region for optimal tracking precision, while the proximal region maintains non-magnetic or low-magnetic material to preserve structural rigidity. This localized application of magnetic properties resolves the contradiction between navigation precision and structural strength.
Solution Approach 2:
The stylet combines magnetic and non-magnetic materials in a composite structure. The magnetic material provides tracking capability while the non-magnetic structural material provides rigidity. This composite approach allows the stylet to simultaneously achieve both navigation precision through magnetic tracking and structural integrity through non-magnetic support elements.
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 stylet enhances the ability to navigate through complex vascular paths by providing adjustable stiffness and flexibility, allowing for precise placement of catheters and cannulas while maintaining rigidity when needed.
Implementation Method 1
The elongated body may comprise at least one magnetic material
Data Source
AI summary
A magnetic stylet includes a core element and a distal region. The core element may include a proximal end coupled to a tab, the proximal end having a first diameter, a transition region, and a distal region extending from the transition region to a distal end. The distal region may have a second diameter less than the first diameter. The distal section may include the transition region and the distal region of the core element, a magnetic element, a polymer member, and a closure element. The magnetic element may be positioned distal of the transition region of the core element. The polymer member may be circumferentially disposed about the distal region of the core element, the continuous permanent magnetic element, and at least a portion of the transition region of the core element. The closure element may be an epoxy that forms a rounded end distal of the polymer member.