Blood Sampling Device Hub Segmentation for Leakage Prevention
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Solution Overview
Problem
Conventional blood sampling devices experience leakage of initial flow blood when the blood sampling holder is rotated with respect to the hub, as the plate and needle cover detach, leading to a reduction in fit-in force and potential leakage.
Innovation Solution
A blood sampling device with a fall-out preventing means arranged on the supporting unit independent from the blood sampling holder, which includes a deformation regulating portion positioned on the tip side of the hollow needle to suppress accordion-like elastic deformation and maintain the fit-in force, preventing the needle cover from falling out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blood sampling holder is rotated with respect to the hub, then the open/close lid does not become an obstruction in the transferring task, but the plate and needle cover detach, reducing fit-in force and causing leakage
Solution Approach 1:
The hub is divided into functionally independent parts: the supporting unit that holds the hollow needle, and the blood sampling holder that can be rotated. The fall-out preventing means is integrated into the supporting unit rather than the blood sampling holder, creating a segmented structure where the protective function remains stationary while the sampling holder rotates freely for operational convenience.
Solution Approach 2:
The fall-out preventing means acts as an intermediary element between the supporting unit and the needle cover. This intermediary component prevents direct detachment of the needle cover from the hub during rotation, mediating the interaction between the rotating blood sampling holder and the stationary supporting unit to maintain fit-in force.
2Ease of operation
If the needle cover is allowed to deform elastically to accordion form, then the hollow needle can penetrate through the rubber plug, but the externally fitted portion bulges and fit-in force lowers
Solution Approach 1:
The fall-out preventing means provides preliminary anti-action by counteracting the bulging of the externally fitted portion before it can cause detachment. This preventive measure acts in advance to maintain the fit-in force even when the needle cover deforms elastically during needle penetration through the rubber plug.
Solution Approach 2:
The fall-out preventing means changes the physical parameters of the needle cover system by providing structural support that limits the degree of elastic deformation. This parameter change allows the needle cover to deform sufficiently for needle penetration while preventing excessive bulging that would reduce fit-in force.
3Ease of operation
If the distal end portion of the needle cover bites into the through-hole of the rubber plug, then the needle can penetrate, but the needle cover may be pulled by the rubber plug and fall out from the hub
Solution Approach 1:
The fall-out preventing means serves as an intermediary that prevents direct pulling of the needle cover from the hub by the rubber plug. This intermediary component intercepts the pulling force before it can cause detachment, maintaining reliable attachment while allowing the needle cover to bite into the through-hole for penetration.
Solution Approach 2:
The fall-out preventing means provides beforehand cushioning by preparing the structural support needed to counteract the pulling force of the rubber plug before detachment occurs. This prior cushioning ensures that even when the needle cover bites into the through-hole during penetration, the fit-in force is maintained and fall-out is prevented.
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 solution effectively prevents the needle cover from detaching from the hub during rotation and reduces the likelihood of leakage by maintaining the fit-in force and suppressing accordion-like elastic deformation, ensuring reliable containment of initial flow blood.
Implementation Method 1
the needle cover is elastically deformed to an accordion form (waveform) so that a diameter becomes larger toward a radially outer side of the hollow needle
Data Source
AI summary
A blood sampling device (10) configuring a blood bag system (12) includes: a hollow needle (80) that can penetrate through a rubber plug (202) of a blood sampling tube (200) inserted into a blood sampling holder (78); a hub (76) that includes a needle supporting unit (90) for supporting a base end side of the hollow needle (80) and to which the blood sampling holder (78) is rotatably attached; a needle cover (82) made of rubber that is externally fitted to the needle supporting unit (90) while covering a tip side of the hollow needle (80); and a cap (84) arranged on the needle supporting unit (90) in such a manner that the cap (84) can come into contact with the needle cover (82) and is independent of the blood sampling holder (78).