Shape Memory Alloy Closure Device for Endoscopic Puncture Sealing
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Solution Overview
Problem
Current methods for closing punctures in the stomach wall during transluminal endoscopic surgery are challenging due to limited maneuverability of endoscopic tools, making reliable closure difficult.
Innovation Solution
A device comprising two end sections with anchoring members connected by a midsection, which transforms from a constrained to an unconstrained configuration to effectively close the puncture, using shape memory alloys or elastic materials to expand and seal the opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional suturing methods are used to close punctures in the stomach wall, then the closure can be achieved, but the limited maneuverability of endoscopic tools makes the procedure challenging and difficult to perform reliably
Solution Approach 1:
The patent replaces the traditional mechanical suturing system with a shape memory alloy-based closure device. The device uses shape memory effect to automatically conform to and seal the puncture site, eliminating the need for complex manual suturing operations through limited endoscopic channels. This substitution maintains reliability while dramatically improving ease of operation.
Solution Approach 2:
The closure device is designed to be self-deploying and self-adjusting once introduced through the endoscope. The shape memory alloy automatically transforms at body temperature to expand and seal the puncture, requiring minimal manual intervention. This self-service mechanism overcomes the maneuverability limitations of endoscopic tools while ensuring reliable closure.
2Area of stationary object
If a closure device is introduced via a catheter through the endoscope, then the device can reach the puncture site, but the device must be compact enough to fit through the catheter while large enough to effectively seal the puncture
Solution Approach 1:
The closure device employs dynamic shape transformation capabilities. In the constrained state, it is compressed to fit within the narrow catheter. Upon deployment at the puncture site, it dynamically expands to a larger configuration that effectively seals the opening. This dynamic size change resolves the contradiction between compact delivery and effective sealing.
Solution Approach 2:
The closure device is nested within the catheter during delivery, similar to a doll within a doll. The device is contained in a compressed state inside the catheter, then extracted and expanded at the target site. This nesting approach allows the device to be small enough for endoscopic delivery while maintaining the capability to become large enough for effective puncture sealing.
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
The device provides a reliable and efficient method to close punctures in body tissue, ensuring effective sealing and minimizing trauma, even with limited tool mobility during endoscopic procedures.
Implementation Method 1
using shape memory alloys or elastic materials to expand and seal the opening
Implementation Method 2
using shape memory alloys or elastic materials to expand and seal the opening
Data Source
AI summary
An apparatus for closing an opening in body tissue, the apparatus comprising: a closing device, including: a base section, a longitudinal axis, and a plurality of anchoring members joined by the base section, each anchoring member including a tip, and having a constrained configuration and an unconstrained configuration, wherein when the anchoring members move from the constrained configuration toward the unconstrained configuration, the tips move toward the longitudinal axis, and a catheter including an external surface configured to force the anchoring members into the constrained configuration, wherein advancement of the closing device along the catheter releases the anchoring members from the external surface, allowing the anchoring members to move from the constrained configuration toward the unconstrained configuration.