Pyloric Anchor Retrieval Hook and Capsule Mechanism
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Solution Overview
Problem
Current bariatric surgical procedures for obesity and diabetes treatment are invasive and come with complications such as tissue necrosis and implant migration due to the use of stents with active fixation means, and there is a need for minimally invasive methods to mimic their effects.
Innovation Solution
A retrieval system and method using an attachment assembly with an arrest mechanism and elongation mechanism to securely extract and remove gastrointestinal implants, including self-expandable stents, from within the body through endoscopic techniques, utilizing a hook assembly and capsule assembly to collapse and retrieve the implants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stents with active fixation means (barbs) are used to prevent implant migration, then the implant stability is improved, but tissue necrosis and erosion occur leading to serious complications
Solution Approach 1:
Instead of using active fixation means (barbs) that penetrate tissue to prevent migration, the invention uses a passive retention mechanism where the implant's natural shape and the delivery system's constriction work together to hold the implant in place during delivery, then release it to assume its stable configuration without penetrating the tissue
Solution Approach 2:
The harmful fixation means (barbs) are completely removed from the implant design. The invention extracts the migration-prevention function from the implant itself and transfers it to the delivery system, allowing the implant to be retained during delivery without having invasive features
2Reliability
If bariatric surgical procedures are performed to treat obesity and diabetes, then treatment effectiveness is improved, but patient recovery time increases and complications occur
Solution Approach 1:
The invention replaces the mechanical surgical system (incisions, staplers, sutures) with an endoscopic delivery system that uses a delivery catheter to implant the device through the gastrointestinal tract without external incisions, thereby maintaining treatment effectiveness while dramatically reducing recovery time
Solution Approach 2:
The delivery catheter serves as an intermediary tool that enables minimally invasive implantation. It allows the implant to be delivered through the natural lumen of the gastrointestinal tract, acting as a mediator between the external delivery system and the internal implantation site without requiring direct surgical access
3Reliability
If stents are implanted to modify food transport and absorption, then treatment effects are achieved, but implant migration occurs due to peristaltic motion
Solution Approach 1:
The implant is designed with dynamic characteristics that allow it to adapt to the peristaltic motion of the gastrointestinal tract. The self-expanding mesh structure can flex and deform with the natural movements of the bowel, maintaining its therapeutic function while accommodating the dynamic environment without migrating
Data Source
AI summary
A retrieval device comprising a hook assembly and a capsule assembly. The hook assembly has an attachment feature at a first end. The capsule assembly includes a capsule, a capsule shaft, and a handle connected in series and defining an inner bore. The capsule has a first end defining an opening. The inner bore of the capsule assembly is configured to slidably receive the hook assembly. The handle has a central portion, a first extension portion attached to the capsule shaft, and a second extension portion with a hook assembly lock at a second end. The hook assembly lock is configured to lock the hook assembly to the second extension portion. The second extension portion is configured to pull the hook assembly relative to the capsule shaft, and the first extension portion is configured to push the capsule shaft relative to the hook assembly along the central longitudinal axis.