Suction Bag Filter Sleeve Geometry for Unblocked Airflow
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Solution Overview
Problem
The passage of air through a filter in a suction bag is impeded or blocked when an additional filter is used in connection with diathermy, or the filter is partially blocked by splashed fluid.
Innovation Solution
A suction bag design featuring a cylindrical filter surrounded by a sleeve with a non-circular cross-section, where the diameter of the widest point is at least 0.90% larger than the narrowest point, allowing for improved airflow even when an additional filter is used or when fluid splashes onto the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional filter is used in connection with diathermy, then patient safety is improved, but air passage through the filter is impeded
Solution Approach 1:
The patent introduces a radial airflow dimension by creating a annular gap between the filter and the suction bag wall. Air can flow radially outward through this gap, adding a dimensional pathway that bypasses the axial flow through the filter, thus maintaining productivity while preserving the safety benefit of the additional filter
Solution Approach 2:
The suction bag is segmented into functional zones: a filter installation recess for the primary filter, and a surrounding annular gap region for alternative airflow. This segmentation allows the system to utilize multiple parallel airflow paths, ensuring that blockage in one path does not completely impede air passage
2Reliability
If fluid splashes onto the filter, then suction function is maintained, but the filter becomes partially blocked
Solution Approach 1:
When fluid blocks the axial airflow through the filter, the radial airflow path through the annular gap becomes the dominant airflow dimension. This dimensional alternative ensures that suction function is maintained even when the primary filter path is partially blocked by fluid splashes
Solution Approach 2:
The annular gap acts as an intermediary airflow path between the filter and the suction bag wall. When the primary filter path is compromised by fluid blockage, this intermediary path provides alternative airflow that maintains suction productivity
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
Ensures unimpeded airflow and normal suction operation despite the use of additional filters or fluid splashes, maintaining effective suction performance.
Implementation Method 1
a negative pressure channel (9) for leading negative pressure suction to the suction bag (1), a filter (10) through which the negative pressure acts on the inside of the suction bag (1) and induces suction on the target being sucked
Data Source
AI summary
The present invention relates to suction bag (1) for medical or surgical use. The suction bag (1) has a connection (13) for a suction target. The suction bag (1) comprises a bag portion (3) and, fixedly connected thereto, a lid (4). The lid (4) comprises a negative pressure channel (9) for leading negative pressure suction to the suction bag, an installation recess (22) for a filter (10), surrounded with a sleeve (11), and a filter (10) installed in the installation recess (22) in connection with the negative pressure channel (9). The cross section of the sleeve (11) differs in shape from circular so that the outer diameter (d1) of its widest point is at least 0.90% larger than the outer diameter (d2) of its narrowest point.