Standing Infusion Bag Base Member Shape Retention
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Solution Overview
Problem
Conventional standing bag type infusion liquid containers experience reduced visibility of residual liquid volume due to the softness of the material, causing the bag to collapse and making it difficult to accurately determine the remaining liquid level, especially when the volume is between 100 mL and 200 mL, which is critical for infusion processes.
Innovation Solution
A standing bag type infusion liquid container with a base member that maintains its width and shape during liquid discharge, using a polyethylene resin film with controlled thickness and elastic modulus, and an air space within the bag for improved visibility, along with marks for visual indication of residual volume, allowing the bag to be suspended with the base member at the top for enhanced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bag is made from soft films to enable self-standing capability and flexibility, then ease of operation is improved, but the bag collapses when residual liquid volume is reduced to around 100 mL, worsening visibility of residual liquid volume
Solution Approach 1:
The patent introduces a shape retainer at the base member portion of the bag, which provides localized structural support only where needed to maintain visibility. This allows the rest of the bag to remain soft and collapsible for ease of operation, while the base member area maintains its shape to prevent film contact and preserve liquid level visibility when residual volume is low.
2Productivity
If the bag collapses evenly including the base end to achieve compact shape, then productivity is improved, but the base member collapses making it difficult to determine residual liquid level, worsening measurement precision
Solution Approach 1:
The patent divides the bag into two functional zones: the body portion that collapses evenly for compact disposal, and the base member portion with a shape retainer that maintains its shape to preserve liquid level visibility. This segmentation allows the bag to be compacted efficiently while maintaining measurement precision in the critical base area.
3Loss of substance
If the bag is made entirely collapsible to reduce material usage, then loss of substance is reduced, but the softness causes opposed film surfaces to contact, worsening visibility of liquid level
Solution Approach 1:
The shape retainer is introduced only at the base member portion where visibility is critical, while the rest of the bag remains made from soft films to minimize material usage. This localized reinforcement prevents film contact in the measurement area without adding excessive material throughout the entire bag.
Data Source
AI summary
The present invention relates to a standing bag type container and aims to increase a visibility of the residual liquid volume in accordance with the progress of infusion process. The standing bag type container includes a bag 10 made of soft resin films and forming at its one end a base member 20 and an outlet port 18 at the other end of the bag. A suspension of the bag 10 is done in a manner that the base member 20 is located at the top. Marks for indication of residual liquid volume are printed on the surface of the bag. An infusion liquid is charged to the bag while an air gap 109′ is left, so that a residual liquid volume is verified from the liquid level. Under the suspended condition, the base member 20 has a value of width which is unchanged from the when the bag is under upright condition. The base member 20 is not collapsed and maintains its width even when the residual liquid volume is zero. A portion of the bag of a predetermined height from the top edge of the bag including the base member 20 maintains its shape without being collapsed by a discharge of the liquid.