Needle-less Connector Protruding Support Surface Blood Backflow
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Solution Overview
Problem
Existing needle-less connectors in the medical field face challenges in preventing backflow of blood during the extraction of the male luer, due to insufficient expansion of the elastic valve body, leading to increased risk of blood coagulation and manufacturing complexities.
Innovation Solution
A needle-less connector design featuring a housing with a protruding support surface that slopes and a flexion section, allowing the elastic valve body to deform and expand upon insertion of the male luer, creating a positive pressure that prevents backflow upon extraction, and incorporating a deformation allowance space for easier operation and reduced rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tip end opening of the drug solution flow path gradually widens towards the elastic valve body, then the male luer can be inserted into the slit, but the central section of the elastic valve body undergoes elastic deformation inwards, causing blood back flow upon extraction
Solution Approach 1:
The support surface is designed with varying local properties: a first support portion with a first slope angle and a second support portion with a second slope angle different from the first. This local variation in geometric properties provides different levels of support to the elastic valve body at different locations, preventing unwanted deformation while allowing necessary movement for operation.
Solution Approach 2:
The invention introduces a new geometric dimension by adding a support surface with specific slope angles to the housing structure. This additional dimensional feature (the angled support surface) provides structural guidance and support to the elastic valve body, controlling its deformation behavior in a way that prevents blood back flow while maintaining ease of operation.
2Object-affected harmful factors
If a hard material is embedded in the partition or valve to prevent blood back flow, then the inside chamber can expand upon insertion, but the partition deforms to penetrate the inside chamber, making sufficient expansion difficult
Solution Approach 1:
The invention removes the hard material embedding from the partition or valve structure. Instead of adding a hard material component, the solution uses the existing elastic valve body material combined with a specifically designed support surface in the housing. This extraction of the hard material simplifies the structure while achieving the same blood back flow prevention function through geometric design.
Solution Approach 2:
The support surface with specific slope angles acts as an intermediary between the housing and the elastic valve body. Rather than using a hard material embedded in the valve, the angled support surface mediates the interaction, providing structural support and guiding the deformation of the elastic valve body in a controlled manner that prevents blood back flow without complicating the valve structure.
3Object-affected harmful factors
If a hard material is embedded in the partition or valve, then blood back flow can be prevented, but manufacturing becomes difficult due to the compound structure and complex shape
Solution Approach 1:
The invention extracts the hard material embedding from the valve or partition structure and relocates the functional requirement to the housing's support surface. This allows the elastic valve body to remain a simple, single-material component that is easier to manufacture, while the blood back flow prevention function is achieved through the geometric design of the support surface with varying slope angles.
4Object-affected harmful factors
If the elastic valve body is supported at the end surface, then blood back flow can be prevented, but the structure becomes more complex
Solution Approach 1:
The support surface is merged with the housing structure rather than being a separate component. The first support portion and second support portion are integrated into the housing, providing structural support for the elastic valve body while maintaining a simple overall device structure. This merging approach achieves blood back flow prevention without adding device complexity.
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
The design effectively prevents backflow of blood by generating a positive pressure within the drug solution flow path, improving the seal efficiency and reducing the risk of blood coagulation, while simplifying the manufacturing process and enhancing operability.
Implementation Method 1
The central section of the elastic valve body undergoes elastic deformation inwards from the tip end opening of the drug solution flow path when inserting the male luer from outside
Implementation Method 2
the male luer is extracted from the slit, which closes with the recovery of the elastic valve both to its original state
Implementation Method 3
an end surface of the housing on a side of the tip end opening of the drug solution flow path constitutes a protruding support surface whose center section protrudes and slopes in a direction of a foot, and the elastic valve body is superposed onto the protruding support surface in a state of close contact therewith
Data Source
AI summary
A needle-less connector includes a housing having a drug solution flow path, and an elastic valve body. An end surface of the housing on a side of a tip end opening of the drug solution flow path constitutes a protruding support surface whose center section protrudes and slopes in a direction of a foot, and the elastic valve body is superposed onto the protruding support surface in a state of close contact therewith. Insertion of a male luer into a slit of the elastic valve body causes expanding deformation of the elastic valve body along the protruding support surface. A flexion section is formed on a sloped surface of the protruding support surface, and the sloped surface has different tilt angles on a foot section side and on a crest section side of the flexion section.