Nested Sleeve Prosthesis for Biliary Decompression
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Solution Overview
Problem
Biliary decompression methods, such as hepaticogastrostomy or choledochoduodenstomy, often result in bile leakage into the peritoneum due to the potential for fluid to escape between the stent and the wall of the bile duct and stomach or duodenum, leading to complications.
Innovation Solution
A prosthesis with a sleeve design that allows fluid flow between two bodily lumens while minimizing leakage, featuring a body with a lumen and a sleeve with a connected portion that extends to contact the wall of the first lumen, preventing fluid from leaking into the peritoneum by directing bile flow through the sleeve lumen from the bile duct to the gastrointestinal tract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent is placed between the hepatic biliary system and the stomach or duodenum for biliary decompression, then biliary obstruction is treated and fluid flow is restored, but bile may leak into the peritoneum through the space between the stent and the wall of the bile duct or gastrointestinal tract
Solution Approach 1:
The patent employs a nested structure where an inner stent is placed within the bile duct and an outer sleeve is positioned around the stent, extending into the gastrointestinal tract. The sleeve is connected to the stent at a connection portion, creating a layered configuration that directs bile flow through the sleeve lumen while preventing leakage into the peritoneum. This nested arrangement ensures that bile is contained within the sleeve-stent system and channeled safely to the gastrointestinal tract.
Solution Approach 2:
The sleeve acts as an intermediary structure between the stent and the gastrointestinal tract wall. It provides a controlled pathway for bile flow, mediating the transition from the biliary system to the gastrointestinal tract while preventing uncontrolled leakage. The sleeve's lumen serves as an intermediate channel that guides bile flow away from the peritoneal space.
2Strength
If the distal portion of the sleeve is connected to the distal portion of the body, then structural support is improved, but fluid flow freedom and adaptability to the gastrointestinal tract wall are reduced
Solution Approach 1:
The prosthesis is divided into distinct segments: a body portion, a connection portion, and a sleeve portion. The connection portion provides structural coupling between the body and sleeve, while the sleeve's distal portion remains free to extend and adapt to the gastrointestinal tract wall. This segmentation allows the proximal portion to maintain structural integrity while the distal portion achieves flexibility and adaptability.
Solution Approach 2:
Different portions of the prosthesis are designed with different properties: the connection portion has structural coupling characteristics for support, while the distal sleeve portion has free extension characteristics for adaptability. This local differentiation of properties allows the device to simultaneously achieve both structural strength and flexibility where needed.
Data Source
AI summary
A prosthesis and a method for directing flow through a passageway formed between a first bodily lumen and a second bodily lumen are provided. The prosthesis includes a body having a proximal portion, a distal portion and a lumen extending therethrough. The prosthesis also includes a sleeve operably connected to the body at a connected portion. The sleeve has a proximal portion, a distal portion, and a sleeve lumen extending therethrough. At least a portion of the body is positioned within at least a portion of the sleeve lumen and the distal portion of the sleeve is free from connection to the distal portion of the body and extendable away from the body to contact a wall of the first bodily lumen. The sleeve is configured to allow fluid flow through the sleeve lumen from the first bodily lumen to the second bodily lumen.