Integrated Blood Bag Flow Paths With Compact Meandering Layout
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Solution Overview
Problem
Existing blood bag systems require manual fusion bonding operations for multiple components, leading to inefficiencies and the need for large-scale devices to form elongate flow paths, which complicates manufacturing and increases costs.
Innovation Solution
A blood bag system is designed with integrally formed bags and flow paths using overlapping sheet bodies, featuring meandering sections that are folded back on themselves and connected via thin-walled cuttable portions, allowing for compact elongate flow paths without increasing the size of the sheet bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual fusion bonding operations are performed for multiple components, then manufacturing precision can be maintained, but productivity decreases and manufacturing complexity increases
Solution Approach 1:
The patent merges multiple separate components (blood collection bag, blood component bag, medicinal solution bag, filter, and flow paths) into a single integrally formed structure. This is achieved by providing a unified sheet body that is formed into the complete blood bag system in one manufacturing process, eliminating the need for multiple manual fusion bonding operations while maintaining manufacturing precision through controlled formation processes.
2Length of moving object
If elongate flow paths are formed using large sheet bodies, then sufficient flow path length is achieved, but device size and manufacturing complexity increase
Solution Approach 1:
The patent applies a meandering section configuration where the flow path is folded back on itself multiple times within the sheet body. This nesting-like arrangement allows the flow path to achieve sufficient length by repeatedly folding within the same spatial footprint, thereby obtaining an elongate flow path without requiring large sheet bodies or increasing device scale.
3Productivity
If components are formed integrally from overlapping sheet bodies, then productivity increases and manual labor decreases, but device complexity increases
Solution Approach 1:
The patent segments the unified sheet body into distinct functional regions including a blood collection bag formation planned portion, a blood component bag formation planned portion, and a medicinal solution bag formation planned portion. This segmentation allows each component to be formed in its designated area while maintaining integral formation, thereby increasing productivity through automated processes while managing complexity through clear functional zonation.
4Length of moving object
If meandering sections are formed by repeatedly folding flow paths, then compact elongate flow paths are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates a meandering section in the flow path where portions are repeatedly folded back on themselves before the final fusion bonding process. This preliminary folding arrangement allows the flow path to achieve sufficient length in a compact configuration, and the folding is performed as part of the integral formation process, thereby managing precision requirements through coordinated processing.
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
This design enables efficient production of blood bag systems with elongate flow paths, reducing manual labor and device size, while maintaining flexibility and ease of separation for different components.
Implementation Method 1
a fusion bonding step of fusion bonding the first sheet body and the second sheet body at peripheral edge portions of the first bag formation planned portions, the second bag formation planned portions, and the preprocessing unit formation planned portions
Data Source
AI summary
A blood bag system is equipped with a blood collection bag in which blood is accommodated, a parent bag and a child bag in which blood components separated from the blood are accommodated, and flow paths that connect the blood collection bag and the parent bag. The blood collection bag, the parent bag, the child bag, and the flow paths are formed integrally by a first sheet body and a second sheet body that is superimposed on the first sheet body, and meandering sections which are repeatedly folded back on themselves are provided in the flow paths.