Endoscopic Stent Delivery Device with Nested Scope
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Solution Overview
Problem
Current endoscopic stent delivery systems are limited by the need to navigate two separate devices, endoscope and stent delivery catheter, which constrains stent size and design, making accurate placement difficult, especially in smaller bodily lumens.
Innovation Solution
An endoscopic stent delivery device with an elongate shaft and a radially distensible stent that can be radially contracted and expanded, featuring a stent holding member and telescoping members, allowing for precise stent deployment within a bodily lumen using a suture thread for controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stent delivery catheter and endoscope are separately advanced to the damaged vessel, then visualization of stent delivery is improved, but the system size is constrained and navigation difficulty increases
Solution Approach 1:
The patent combines the stent delivery catheter and endoscope into a single integrated device where the endoscope is positioned within the inner shaft of the stent delivery catheter. This merging eliminates the need to navigate two separate devices independently, reducing navigation complexity while maintaining visualization capability throughout the stent delivery process.
Solution Approach 2:
The endoscope is nested within the inner shaft of the stent delivery catheter, creating a compact configuration where one device is contained within another. This nesting arrangement allows both devices to be delivered through a single pathway while maintaining their individual functions, solving the navigation problem of coordinating two separate devices.
2Device complexity
If the endoscope is positioned within the inner shaft of the stent delivery catheter, then navigation is simplified, but the stent diameter is constrained by the endoscope size
Solution Approach 1:
The stent is designed with dynamic radial expandability, transitioning from a compressed delivery state to an expanded deployed state. This dynamic transformation allows the stent to exceed the diameter constraints of the endoscope during delivery, then achieve its full functional diameter after deployment, resolving the size limitation imposed by the nested configuration.
Solution Approach 2:
The stent undergoes a parameter change in its radial dimension, transitioning from a small compressed diameter suitable for passage through the endoscope to a large expanded diameter for functional deployment. This parameter transformation enables the stent to overcome the size constraints of the delivery system while maintaining navigability.
3Productivity
If the stent is pushed out from the distal end of the endoscope, then delivery is achieved, but accurate placement becomes difficult
Solution Approach 1:
Instead of pushing the stent out from the distal end, the system inverts the delivery mechanism by having the stent held against the distal end of the endoscope and delivered through controlled release. This inversion provides better control and visibility during placement, allowing for accurate positioning before deployment.
Solution Approach 2:
The endoscope provides real-time visual feedback during stent delivery, allowing the operator to monitor stent position and make adjustments before final deployment. This feedback mechanism enables accurate placement by allowing continuous observation and control during the delivery process.
4Stability of the object's composition
If rings or tubes are added to restrict stent diameter, then stent containment is improved, but flow through the stent is restricted
Solution Approach 1:
The stent transitions from a compressed state with restricted diameter for containment during delivery to an expanded state with full diameter for optimal flow. This parameter change eliminates flow restriction by transforming the stent from a confined delivery configuration to an open functional configuration after deployment.
Solution Approach 2:
The stent structure is dynamic, allowing it to transition from a contained compressed state during delivery to an expanded functional state after deployment. This dynamic behavior resolves the contradiction between containment during delivery and flow after deployment by making the stent size adaptable to different operational phases.
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 accurate and flexible stent placement without size or design constraints, improving delivery precision and usability across various bodily lumens.
Implementation Method 1
a radially distensible, polymeric and/or non-polymeric stent
Implementation Method 2
an inner tubular member slidably disposed within the working channel
Data Source
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AI summary
The present invention is directed to an endoscopic stent delivery device. The device includes an endoscope having an elongate shaft including a proximal end. a distal end, an outer wall and a longitudinal working channel through the elongate shaft defining an inner wall of the elongate shaft; a stent juxtaposingly disposed to a distal portion of the inner wall; and an inner tubular member slidably disposed within the working channel and having a stent holding member engaging an interior portion of the stent for releasably securing the stent to the distal portion of the inner wall. The device may further include a viewing device disposed at the distal end of the endoscope and/or an illuminating device disposed at the distal end of the endoscope.