Transcecal Catheter with Collapsible Valve Segment
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Solution Overview
Problem
Current temporary ileostomy procedures require two surgical operations, leading to high morbidity, mortality, and costs, with the second operation often being too risky for patients, potentially resulting in a permanent ostomy instead of a temporary one.
Innovation Solution
A transcecal catheter with a collapsible portion at the cecal valve and inflatable balloons made of non-stretching material, along with a filament for selective suture or staple connection, allowing for a single surgical operation and later removal without additional surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an entirely non-collapsing catheter is used to pass through the cecal valve, then the catheter maintains structural integrity and positioning stability, but the risk of damage to the cecal valve increases
Solution Approach 1:
The catheter is divided into multiple segments with different properties: a collapsible portion at the cecal valve and non-collapsing portions on either side. This segmentation allows the catheter to have both collapsing capability at the critical location and structural integrity elsewhere, resolving the contradiction between stability and tissue damage risk.
Solution Approach 2:
Different portions of the catheter are given different qualities: the portion at the cecal valve is made collapsible to minimize damage, while the portions on either side are made non-collapsing to maintain structural integrity. This local differentiation of properties allows the catheter to simultaneously achieve both goals.
2Volume of moving object
If elastic material is used for the balloon that stretches during inflation, then the balloon can expand to the required size, but higher inflation pressures are required and forces on surrounding tissue are less predictable
Solution Approach 1:
The balloon material property is changed from elastic (stretching) to non-stretching. This parameter change allows the balloon to expand to the required volume without requiring high inflation pressures to overcome elastic return forces, and the forces applied to surrounding tissue become equal to and predictable from the inflation pressure alone.
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
Reduces the risk of damage to the cecal valve, minimizes pressure on mucosal tissue, and enables controlled and predictable tissue interaction, facilitating safer and more effective temporary ostomy management.
Implementation Method 1
a collapsible catheter portion intended to sit at the cecal valve... the collapsible portion may be made of thinner wall material than the non-collapsing portions
Implementation Method 2
The inflatable balloon is made of flexible material formed (e.g., molded) in a pre-inflated shape such that, in that shape, the wall material of the balloon does not stretch elastically. In use, the balloon is intended to be inflated to size up to (or smaller than) the pre-inflated shape.
Data Source
AI summary
A temporary ostomy appliance is disclosed, including a catheter for extending through the abdominal wall into the intestine. The catheter may be a transcecal catheter for extending through the cecal valve into the ileum. A portion of a catheter that extends through the cecal valve is made collapsible when the catheter is empty. The collapsed portion expands to permit passage of effluent. A balloon carried on the catheter is preformed with a shape and size in order to permit inflation without elastic stretching of the balloon wall material. A filament is provided for permitting a portion of the catheter to be fastened to internal body tissue by surgical sutures or staples. In order to release the fastening without further surgery, the filament is withdrawn by pulling on a proximal portion outside the body.