Ostomy Bag with Continuous Curved Wall and No Sealed Edges
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Solution Overview
Problem
Conventional ostomy collecting bags with sealed edges are inflexible, prone to pancaking, and have unfillable volumes due to their design, leading to increased surface area and potential leakage issues.
Innovation Solution
A collecting bag with a rounded shape and no sealed edges, manufactured through extrusion or injection blow-moulding processes, providing a continuous foil material with a smooth transition and increased flexibility, reducing the risk of pancaking and leakage while maintaining a smaller surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional ostomy collecting bags are made with sealed edges, then structural integrity is maintained, but flexibility is reduced and pancaking occurs
Solution Approach 1:
The collecting bag is designed with a rounded, three-dimensional shape where the wall transitions smoothly from front to rear without sharp edges or corners. This curvature eliminates the rigid sealed edges found in conventional flat bags, allowing the bag to flex naturally without pancaking while maintaining structural integrity through its continuous rounded form.
Solution Approach 2:
The invention uses a continuous foil material that forms a seamless, flexible shell structure. By eliminating sealed edges and using a continuous film that is heat-sealed only at the opening, the bag achieves maximum flexibility while maintaining sufficient structural strength to contain waste without deforming or pancaking.
2Ease of manufacture
If sealed edges are used in collecting bags, then manufacturing is simplified, but unfillable volumes are created and leakage risk increases
Solution Approach 1:
The invention removes the sealed edges from the collecting bag design, extracting only the essential heat-seal at the opening where waste is introduced. This eliminates the unfillable dead spaces created by sealed edges and removes potential leakage points, while the manufacturing process remains simple through continuous foil formation and a single heat-seal operation.
3Ease of operation
If rounded shape is implemented, then flexibility and fillable volume are improved, but manufacturing complexity increases
Solution Approach 1:
The continuous foil material is formed into a rounded three-dimensional shape through a blow-moulding process that inflates a tube within a mould cavity. This method achieves the desired flexible rounded shape using standard plastic forming equipment, without requiring complex multi-step manufacturing or assembly operations.
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 solution enhances flexibility and reduces the risk of pancaking, allowing for a larger fillable volume without the need for sealed edges, thus providing a more comfortable and efficient ostomy appliance.
Implementation Method 1
In the extrusion blow-moulding process, an endless tube is initially extruded and subsequently the tube is blow-moulded to provide the finished collecting bag. In the injection blow-moulding process, a pre-form is initially injection moulded and subsequently the pre-form is blow-moulded to provide the finished collecting bag.
Implementation Method 2
In the extrusion blow-moulding process, an endless tube is initially extruded
Implementation Method 3
an endless tube is initially extruded and subsequently the tube is blow-moulded
Data Source
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AI summary
An ostomy collecting bag is provided. The collecting bag has a continuous wall with a curvature instead of sealed edges. The collecting bag is truly three-dimensional. The collecting bag may be obtained by injection blow-moulding or extrusion blow-moulding. Methods of producing an ostomy collecting bags by either injection blow-moulding or extrusion blow-moulding is also provided. In injection blow-moulding, a pre-form is injection moulded and subsequently the pre-form is blow-moulded into an ostomy collecting bag. In extrusion blow-moulding, a tube is extruded and subsequently blow-moulded into an ostomy collecting bag. The ostomy collecting bag can thus be made without seals at the edges, which provides a more flexible collecting bag with a larger interior volume.