Mixture Injection Port Circulating Portion Fluid Stagnation
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Solution Overview
Problem
Conventional mixture injection ports experience fluid stagnation and poor cleaning efficiency due to the septum's deformation during cannula insertion, leading to residual medical liquids and potential microbial growth, especially when used for infusion and blood collection.
Innovation Solution
The design incorporates a circulating portion within the channel tube to redirect medical fluids to the septum side, preventing stagnation and enhancing cleaning efficiency by guiding fluids through a circulating plate and edge portion, and an optional fluid-stagnation-preventing rib on the septum to seal gaps and improve sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner cavity is made wide to accommodate the bended septum during cannula insertion, then the ease of operation is improved, but fluid stagnation occurs in the area on the septum side leading to poor cleaning efficiency
Solution Approach 1:
The inner cavity is divided into a first cavity (near cannula insertion point) and a second cavity (near septum) by the circulating portion. This segmentation allows the first cavity to be wide for easy cannula insertion while the second cavity receives circulated fluid for effective cleaning, resolving the contradiction between ease of operation and cleaning efficiency.
Solution Approach 2:
The circulating portion acts as an intermediary structure that redirects fluid from the first cavity to the second cavity. It includes a circulating plate with a through-hole and an edge portion that guides fluid flow, ensuring that the wide inner cavity does not lead to fluid stagnation but instead enables effective circulation and cleaning.
2Ease of operation
If the septum is allowed to bend during cannula insertion, then the ease of operation is improved, but fluid stagnation and microbial growth risk increase
Solution Approach 1:
The circulating portion serves as an intermediary that ensures fluid reaches the second cavity near the bent septum. The edge portion of the circulating portion guides fluid to follow the septum's bending direction, preventing fluid stagnation and reducing microbial growth risk while allowing the septum to bend for easy cannula insertion.
Solution Approach 2:
The circulating portion is pre-positioned in the inner cavity before cannula insertion. Its edge portion is designed to guide fluid flow in advance along the path where the septum will bend, ensuring that fluid circulation and cleaning occur effectively even as the septum deforms during insertion.
3Reliability
If a fluid-stagnation-preventing rib is added to seal gaps on the septum, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The fluid-stagnation-preventing rib is merged with the circulating portion to form an integrated structure. The rib extends from the outer circumferential surface of the circulating portion toward the septum, combining the circulation function with the sealing function in a single component, thereby improving reliability without significantly increasing device complexity.
Solution Approach 2:
The fluid-stagnation-preventing rib is added locally to specific areas where gaps and fluid stagnation are most likely to occur. This localized addition provides targeted sealing improvement without requiring a complete redesign of the entire device structure, thus maintaining simplicity while enhancing reliability.
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 configuration ensures reliable fluid replacement and efficient cleaning, reducing microbial growth and stagnation, even during extended use or suspension of infusion, thereby preventing infections and maintaining port hygiene.
Implementation Method 1
the septum 920 is bended in the direction of its insertion
Implementation Method 2
the channel tube is provided with a circulating portion for circulating a medical fluid injected from the inserted tube member to the septum side and then guiding the fluid to the downstream side of the channel tube
Implementation Method 3
there is provided an edge portion which extends from the outer circumferential surface of the circulating portion in a radial direction of the channel tube toward the septum side, the edge portion guiding a fluid to flow along the septum side
Implementation Method 4
a fluid-stagnation-preventing rib extending from an outer circumferential surface of the circulating portion in a radial direction of the channel tube toward the septum side, for sealing a gap portion between the septum and an inner wall of the channel tube
Data Source
AI summary
A mixed injection port capable of suppressing the continuous accumulation of medical fluid or blood therein and allowing efficient internal cleaning, wherein a recirculation part (140) is formed at a step between an inner cavity (114) and a thin tube part (117). Even if the fluid is accumulated in a clearance area (1141) produced in the inner cavity (114) when a lure is inserted into a slit (131), the fluid can be securely replaced with the fluid newly flowing therein through a septum (130) and the continuous accumulation of the fluid can be suppressed. A more efficient internal cleaning can be realized by installing a fluid accumulation prevention part such as an annular rib between the septum (130) and the inside wall of the inner cavity (114) and burying the clearance area (1141).