Screw-Driven Stent Delivery System for Precise Coronary Positioning
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Solution Overview
Problem
Existing stent positioning systems are limited in their application, particularly for ostial lesions of the left and right coronary arteries, and require manual positioning, leading to longer procedures that increase radiation exposure for patients and medical staff, and are not suitable for various coronary bed segments.
Innovation Solution
A stent delivery system with a mechanism comprising a body with a screw rotation wheel, slider, cam, rubber coupling, wedge, and lock button, allowing for mechanical and precise positioning of stents with reduced radiation exposure and applicability to any coronary bed segment, featuring a compact and ergonomic design for ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual positioning of coronary stent is used, then the procedure can be performed with simple device structure, but the positioning time increases leading to higher radiation exposure
Solution Approach 1:
The patent replaces manual mechanical positioning with an automated screw-driven mechanical system. The screw mechanism converts rotational motion into precise linear displacement of the stent delivery catheter, enabling automated positioning that reduces procedure time and radiation exposure while maintaining mechanical reliability without complex electronics.
2Device complexity
If existing stent positioning systems are used for ostial lesions, then the device can be simple in structure, but the application scope is limited to specific coronary artery segments
Solution Approach 1:
The patent designs a universal stent delivery system with a telescopic catheter and adjustable screw mechanism that can accommodate different stent sizes and deliver them to various coronary artery segments including ostial lesions, bifurcations, and distal vessels. The system integrates multiple functions (positioning, deployment, and adaptation to different anatomies) into a single device platform.
3Object-affected harmful factors
If precise mechanical positioning is implemented, then radiation exposure is reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent employs a purely mechanical screw-driven positioning system without electronic sensors, motors, or control systems. The screw mechanism provides precise, repeatable positioning through mechanical advantage, achieving accurate stent placement while avoiding the complexity and cost of electronic positioning systems.
4Measurement precision
If a telescopic catheter system is used for stent delivery, then positioning precision is improved, but the device structure becomes more complex
Solution Approach 1:
The patent utilizes a nested catheter design where the delivery catheter is telescoped within the guide catheter. The screw mechanism advances the delivery catheter precisely along the guide catheter axis, enabling controlled stent deployment at the target site while maintaining a compact, manageable device structure through nested configuration.
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 quicker, more precise stent placement with reduced radiation exposure and increased versatility across different coronary bed segments, while being cost-efficient and suitable for training professionals, with a design that minimizes patient exposure to radiopaque medium.
Implementation Method 1
a screw rotation wheel, a screw
Implementation Method 2
a spring and a lock button
Data Source
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AI summary
The invention is suitable for use in medicine for maximally precise, safe and quick positioning a coronary stent in case of simple and complicated anatomical lesions of the coronary bed as well as for stenting renal, visceral arteries. The claimed device comprise a body with a tail portion, a screw rotation wheel, a screw, a slider with a cam, a bush with hoes and a rubber coupling provided thereon, a wedge comprised of two members, a spring and a lock button arranged in the body. In preparation to use the device, the coronary stent on the delivery system is first successively introduced into the device whereafter the coronary stent on the delivery system is manually advanced to the affected area of the coronary artery, the delivery system is locked in the device and the stent is positioned within the coronary artery by means of the rotation wheel.