Triangular Rod Magnetic Marker for Needle Delivery and Detection
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Solution Overview
Problem
Existing magnetic marker technologies do not specify structures suitable for easy detection, lacking clarity on preferred configurations for magnetization states.
Innovation Solution
A magnetic marker set comprising stick-shaped rods with reversible magnetization at connecting portions, extruded into a triangular configuration to enhance magnetic field strength, facilitated by a draw-in mechanism and magnetization using a permanent magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic marker is inserted into needle for delivery, then marker can be precisely positioned at target site, but magnetic field strength is weakened making detection difficult
Solution Approach 1:
The magnetic marker is divided into three separate rod elements (first rod, second rod, third rod) that can be independently positioned and magnetized. This segmentation allows the marker to be delivered in a compact linear configuration through the needle while forming a triangular detection configuration at the target site, resolving the contradiction between delivery feasibility and detection precision.
Solution Approach 2:
The magnetic marker transitions from a one-dimensional linear arrangement (during needle insertion) to a two-dimensional triangular arrangement (at target site). This dimensional change allows the marker to maintain compact delivery profile while achieving optimal detection geometry at the target, simultaneously satisfying both delivery and detection requirements.
2Ease of operation
If magnetic marker forms linear arrangement, then structure is simple for delivery, but magnetic field strength is insufficient for easy detection
Solution Approach 1:
The magnetic marker employs a dynamic structure where three rods are connected by rotatable connecting portions, allowing the marker to transition from a linear delivery configuration to a triangular detection configuration. This dynamic adaptability enables the marker to achieve strong magnetic field for easy detection while maintaining structural simplicity for delivery.
3Reliability
If magnetic marker is magnetized with uniform orientation, then magnetization process is simple, but magnetic field reversals are insufficient for strong detection signal
Solution Approach 1:
The magnetic marker implements local quality variation by magnetizing different rod segments with opposite magnetic orientations. The first rod and third rod are magnetized in opposite directions to the second rod, creating strategic magnetic field reversals at the connecting portions. This localized magnetization differentiation enhances detection reliability through strong magnetic field reversals while maintaining overall magnetization simplicity.
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 enhanced magnetic field strength facilitates easier detection of the marker, particularly at greater distances, and the triangular configuration aids in precise positioning and recognition.
Implementation Method 1
The magnetic marker has been magnetized such that an orientation of a magnetic field reverses at the first connecting portion
Implementation Method 2
a draw-in mechanism that brings other longitudinal end of the first rod and other longitudinal end of the third rod close to each other when the magnetic marker is extruded from the hole
Data Source
AI summary
A magnetic marker set includes: a magnetic marker including a first rod and a second rod each formed of a stick-shaped ferromagnetic substance, and a stick-shaped third rod; and a needle with a hole in a longitudinal direction thereof. The magnetic marker includes a first connecting portion at which one longitudinal end of the first rod and one longitudinal end of the second rod are rotatably connected, and a second connecting portion at which other longitudinal end of the second rod and one longitudinal end of the third rod are rotatably connected. The magnetic marker is inserted into the hole and has been magnetized such that an orientation of a magnetic field reverses at the first connecting portion. The magnetic marker set includes a draw-in mechanism that brings other longitudinal end of the first rod and other longitudinal end of the third rod into contact with each other.