Tissue Retraction Device with Angled Engagement Members
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Solution Overview
Problem
Current tissue retraction devices for endoscopic submucosal dissection face challenges such as prolonged procedure times, complex device exchanges, and poor visualization of target tissue margins, often due to the need for extensive saline solution injection and obstruction by the tissue being dissected.
Innovation Solution
The development of a tissue retraction device with a cap and extension member that engages a first engagement member at an angle, and a clip to orient a second engagement member parallel to the cap's lumen, along with an elastic member connecting both engagement members, allows for efficient tissue engagement, lifting, and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If endoscopic caps are used to provide tissue traction, then tissue retraction is achieved, but large amounts of saline solution must be continuously injected and multiple device exchanges are required, increasing procedure time
Solution Approach 1:
The device is divided into distinct functional modules: a cap for tissue engagement, an extension member for positioning, and multiple engagement members with springs for tissue grasping. This segmentation allows each component to perform its specific function efficiently without requiring complete device replacement
Solution Approach 2:
The engagement members with springs are nested within the cap structure, allowing them to be stored and deployed within the same device assembly. This eliminates the need for multiple device exchanges while maintaining continuous tissue retraction capability
2Reliability
If endoscopic caps are used to provide tissue traction, then tissue retraction is achieved, but device complexity increases due to multiple device exchanges and extended procedure steps
Solution Approach 1:
Multiple functional elements (cap, extension member, engagement members with springs) are merged into a single integrated device assembly. This combination simplifies the overall procedure by eliminating the need for multiple separate device exchanges while maintaining effective tissue retraction
Solution Approach 2:
The cap structure serves multiple functions: it provides tissue engagement, houses the engagement members with springs, and facilitates tissue retraction. This multi-functionality reduces procedure complexity by consolidating several operations into one device
3Reliability
If tissue is retracted using conventional devices, then traction is provided, but the target tissue itself obstructs the pathway of dissection tools
Solution Approach 1:
The engagement members with springs provide tissue grasping in a radial dimension perpendicular to the longitudinal axis of the cap. This dimensional approach allows tissue retraction without blocking the longitudinal pathway for dissection tools
Solution Approach 2:
The engagement members with springs act as intermediaries that grasp and retract tissue laterally, creating space for dissection tools to pass through the central pathway without direct obstruction from the retraction mechanism
4Reliability
If conventional tissue retraction devices are used, then some tissue engagement is achieved, but visualization of target tissue margins deteriorates
Solution Approach 1:
The cap and engagement members are designed to engage and retract tissue locally at the target site while maintaining clear visualization of surrounding tissue margins. This localized approach improves visualization by retracting only the necessary tissue without obscuring the broader surgical field
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 solution decreases complications in tissue retraction procedures by improving visualization, reducing procedure time, and simplifying the complexity of device manipulation, while effectively mitigating tissue obstruction during dissection.
Implementation Method 1
An elastic member having a distal end, proximal end and length therebetween may be connected at the distal and proximal ends to the respective first and second engagement members
Implementation Method 2
The extension member may engage a spring of the first engagement member such that the spring is disposed about the extension member
Implementation Method 3
The clip may be configured to grasp a spring of the second engagement member
Data Source
AI summary
The present disclosure pertains to medical devices. More particularly, the present disclosure pertains to tissue retraction devices and related delivery systems and methods.