Magnetic Stent Release Mechanism for Precise Catheter Positioning
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Solution Overview
Problem
Existing stent delivery methods face challenges in precisely controlling the expansion of self-expandable stents within the body due to the difficulty in maintaining the position of the catheter while applying a large force, leading to imprecise stent deployment.
Innovation Solution
A stent delivery device that utilizes an external magnetic field to control the rotation of magnets within the device, allowing for wireless expansion of the stent by aligning the polarity of driving magnets with a fixed magnet, thereby releasing coupling pieces and expanding the stent without manual operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual operation is used to expand the stent by pushing through the catheter, then the stent can be delivered to the desired position, but it is difficult to precisely maintain the position of the catheter end while applying large force
Solution Approach 1:
The patent replaces the manual mechanical pushing operation with a magnetic field-based actuation system. Magnets embedded in the stent are attracted by an external magnetic field generated by a controllable device, enabling precise positioning and expansion without manual force application. This substitution eliminates the conflict between maintaining catheter position and applying expansion force.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the operator and the stent. Instead of direct mechanical contact and force transmission, the magnetic field serves as a mediator that can precisely control stent movement and expansion remotely, solving the positioning accuracy problem during manual operation.
2Force
If both hands are used to apply momentary large force to expand the stent, then the expansion force is sufficient, but it is difficult to maintain catheter position stability
Solution Approach 1:
The patent replaces manual two-handed mechanical operation with a magnetic field actuation system. The magnetic attraction force can be precisely controlled to provide sufficient expansion force while the system maintains catheter stability through remote, forceless control. The magnetic field can be adjusted to deliver exactly the needed force without requiring operator hands on the catheter.
Solution Approach 2:
The stent system is designed with embedded magnets that respond automatically to external magnetic field control. The system serves itself by converting magnetic field energy directly into mechanical expansion force, eliminating the need for manual force application and thereby maintaining position stability without compromising expansion capability.
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
Enables precise and controlled expansion of stents within the body using an external magnetic field, eliminating the need for manual manipulation and improving positioning accuracy.
Implementation Method 1
each of the first driving magnet and the second driving magnet is relatively rotated by control of an external magnetic field with respect to the fixed magnet about a first direction to allow polarity same as polarity of the fixed magnet to be arranged in series in the first direction
Data Source
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Figure 3
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AI summary
The present invention relates to a stent delivery device having: a first support rod into which a first movable body is inserted; a fixed magnet; and a second support rod into which a second movable body is inserted, wherein a first driving magnet included in the first movable body and a second driving magnet included in the second movable body rotate relative to each other by means of the control of an external magnetic field at a predetermined angle around an axis in a first direction with respect to the fixed magnet, thereby separating a first coupling piece and a second coupling piece from a first coupling groove and a second coupling groove and enabling a stent to unfold.