Stent Delivery System Threaded Rod Actuation
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Solution Overview
Problem
Current stent delivery systems face challenges in efficiently deploying stents within body lumens while maintaining guidewire position and preventing kinking, particularly at the handle region.
Innovation Solution
The stent delivery system incorporates a deployment sheath coupled to a threaded rod and a coupling member, allowing for rotational actuation to translate the sheath and uncover the stent, while maintaining guidewire position through a design that reduces kinking by allowing the rod to rotate within the handle and utilizing a coupling mechanism with internal and external threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deployment sheath is used to cover and deploy the stent, then stent deployment control is improved, but the risk of guidewire kinking at the handle region increases
Solution Approach 1:
The system divides the deployment mechanism into separate functional components: a deployment sheath for stent delivery, a threaded rod for actuation, and a coupling member for connection. This segmentation allows the guidewire to remain separate and uncoupled during deployment, eliminating the kinking risk while maintaining deployment control.
Solution Approach 2:
The guidewire is extracted from the coupling mechanism entirely. The coupling member connects only the deployment sheath to the threaded rod, leaving the guidewire independent. This extraction eliminates the harmful interaction that causes guidewire kinking while preserving the deployment function.
2Measurement precision
If a threaded rod with coupling member is used for actuation, then deployment precision is improved, but device complexity increases
Solution Approach 1:
The coupling member serves as an intermediary component that connects the threaded rod to the deployment sheath. It translates the rotational motion of the threaded rod into axial movement of the sheath, providing precise deployment control while keeping each component relatively simple in design.
Solution Approach 2:
The system replaces complex mechanical coupling mechanisms with a simpler threaded rod and coupling member assembly. The threads provide mechanical advantage and precise positioning without requiring complex gears, linkages, or multiple moving parts.
3Stability of the object's composition
If the rod rotates within the handle during deployment, then guidewire position stability is improved, but the coupling mechanism complexity increases
Solution Approach 1:
The threaded rod is designed to rotate freely within the handle during deployment. This dynamic rotation, combined with the threaded engagement at the coupling member, converts rotational motion into precise linear displacement of the deployment sheath while maintaining guidewire stability through the decoupled architecture.
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 design enables precise stent deployment while maintaining guidewire position and reducing the likelihood of kinking, providing a more effective and reliable method for stent delivery within body lumens.
Implementation Method 1
the rod having a distal end region, a proximal end region and a first threaded portion extending from the distal end region to the proximal end region and a coupling member configured to couple the rod to the deployment sheath, the coupling member having an engagement portion. Additionally, the first threaded portion of the rod is designed to engage the engagement portion of coupling member and rotation of the rod is designed to translate the coupling member along the rod.
Data Source
AI summary
Stent delivery systems and methods for making and using stent delivery systems are disclosed. An example stent delivery system may include an inner member having a stent receiving region, a stent disposed along the stent receiving region, a deployment sheath axially slidable relative to the inner member, the deployment sheath having a proximal end region, a handle coupled to the deployment sheath, a rod coupled to the handle, the rod having a distal end region, a proximal end region and a first threaded portion extending from the distal end region to the proximal end region and a coupling member configured to couple the rod to the deployment sheath, the coupling member having an engagement portion. Additionally, the first threaded portion of the rod is designed to engage the engagement portion of coupling member and rotation of the rod is designed to translate the coupling member along the rod.