Dialysate Bag Wall Break Detection Mechanism
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Solution Overview
Problem
It is challenging to ensure that the partition walls separating compartments in dialysate bags are broken before use, as it is difficult and restrictive to verify this, especially in home hemodialysis settings, leading to potential toxic dialysate for patients due to unmixed contents.
Innovation Solution
A device comprising a lower and upper stage with detection means to determine the relative position, allowing for non-intrusive detection of the broken state of the partition wall by contact or distance, preventing dialysis machine operation if the wall is not broken.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual verification of partition wall rupture is used, then the device complexity is low, but the reliability of detection is insufficient and difficult to ensure
Solution Approach 1:
The system uses the pocket itself as the detection mechanism. When the partition wall breaks, the liquid flows freely and causes the pocket to collapse, which automatically triggers the detection signal through the pre-positioned detection element. This self-service approach eliminates the need for complex external verification equipment while ensuring reliable detection.
Solution Approach 2:
A detection element is introduced as an intermediary between the pocket and the control system. This element detects the physical state change of the pocket (caused by liquid flow after partition wall rupture) and converts it into a detectable signal, serving as a mediator that simplifies the overall detection mechanism while improving reliability.
2Measurement precision
If intrusive detection means are used, then the measurement precision may be high, but the dialysate purity is compromised due to contamination risk
Solution Approach 1:
The detection element acts as an intermediary that indirectly measures the partition wall rupture state by detecting pocket collapse, rather than directly interacting with the dialysate. This indirect measurement approach maintains high detection precision while eliminating contamination risk to the dialysate.
Solution Approach 2:
The detection function is extracted from the dialysate system and placed in the mechanical support structure. The detection element is positioned in the support, separate from the dialysate compartment, allowing detection of pocket state changes without any contact with or contamination of the dialysate.
3Ease of operation
If simple visual inspection is used, then the ease of operation is high, but the detection speed and reliability are insufficient
Solution Approach 1:
The system provides automatic feedback to the control system when partition wall rupture is detected. The detection element senses the pocket collapse and sends a signal to the control system, which then provides feedback to the operator or automatically prevents dialysis machine operation. This feedback mechanism maintains operational simplicity while significantly improving detection reliability.
Solution Approach 2:
Manual visual inspection is replaced with an automated detection system that uses mechanical sensing (detection element responding to pocket collapse) and electronic signaling. This substitution maintains ease of operation as the system automatically performs detection without requiring manual inspection, while dramatically improving reliability through objective, consistent detection.
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
Enables reliable, quick, and non-invasive detection of the broken state of the partition wall, ensuring proper mixing of dialysate contents and preventing the use of potentially toxic dialysate.
Implementation Method 1
said lower and upper stages and the pocket housed in the lower stage are arranged such that said upper stage comprises at least one part, called the detection part, which, in the broken state of the partition wall(s) of the pocket housed in the lower stage, is able to come into a position close to the lower floor
Data Source
Figure 1~1A
Figure 2~2A
Figure 3
AI summary
The invention concerns a device (1) for detecting the breaking of a wall (3) separating compartments (21, 22) in a dialysate bag (2). Said device comprises a lower stage (4) and an upper stage on each of which another dialysate bag (2) rests. According to the invention, said lower (4) and upper (5) stages and the bag accommodated in the lower stage (4) are arranged such that said upper stage (5) comprises at least one portion (54), called detection portion, which, when said wall (3) separating the bag accommodated in the lower stage is in the broken state, is capable of coming into contact with the lower stage, and which, when the wall separating the bag accommodated in the lower stage is in the unbroken state, is capable of remaining apart from said lower stage. The device comprises means for detecting the relative position of the upper stage relative to said lower stage.