Hemostasis Valve Needle Vent Filter for Air Discharge and Leak Prevention
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Solution Overview
Problem
Existing indwelling needles face the risk of blood leakage due to deformation of the filter in the air vent passage, which is not adequately secured, allowing air to enter the body and compromising the integrity of the internal flow path.
Innovation Solution
The indwelling needle is designed with an air vent passage that communicates with the external space beyond the hemostasis valve, featuring a filter mounted in a compressed state or clasped by rigid members, ensuring that only gas can pass through while preventing liquid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the filter is merely arranged to overlap the inner circumferential surface of the link connector, then the structure is simple, but the filter is easily deformed by blood pressure causing blood leakage
Solution Approach 1:
The filter is pre-compressed to a smaller diameter than the air vent passage before installation. This preliminary compression allows the filter to be inserted into the passage, where it then expands to contact the inner circumferential surface, creating a secure fit that resists blood pressure without requiring complex mounting structures
Solution Approach 2:
The filter's diameter parameter is changed during installation - compressed to a smaller diameter for insertion, then expands to the larger diameter needed for sealing against the air vent passage wall. This parameter transformation enables simple installation while ensuring reliable blood leakage prevention under pressure
2Reliability
If the filter is mounted in a compressed state on the air vent passage, then blood leakage is prevented, but the filter structure becomes more complex
Solution Approach 1:
The filter is pre-compressed to a smaller diameter before installation. This preliminary compression state enables the filter to be inserted into the air vent passage, where it then expands to create a secure sealing fit, achieving reliable blood leakage prevention through a simple compression mechanism rather than complex mounting structures
Solution Approach 2:
The filter undergoes a diameter parameter change during installation - from a compressed smaller diameter to an expanded larger diameter that seals against the passage wall. This parameter transformation provides an simple yet effective solution for preventing blood leakage
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 stabilizes air discharge and prevents blood leakage by maintaining the filter's integrity, even under pressure, thus ensuring reliable air venting without compromising the internal flow path's seal.
Implementation Method 1
a filter that allows gas to pass through but does not allow liquid to pass through
Data Source
Figure 1~3
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Figure 7~8
AI summary
Provided is a novel hemostasis valve-equipped indwelling needle that is capable of discharging air in an internal flow path. A hemostasis valve-equipped indwelling needle 10 including a cannula 12 to be inserted percutaneously into a blood vessel on a distal end side thereof, a link connector 14 on a proximal end side thereof, an internal flow path 18 extending from the cannula 12 to the link connector 14, and a hemostatic valve 16 disposed inside the link connector 14. An air vent passage 118 that allows the internal flow path 18 to communicate with an external space is formed in the link connector 14 further on the cannula 12 side than the hemostatic valve 16, and a filter 120 that allows gas to pass through but does not allow liquid to pass through is mounted in a compressed state on the air vent passage 118.