Injection Conduit Flow Blocking for Body Fluid Backflow Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing chemical liquid injecting apparatuses face the challenge of body fluid backflow from the replaceable conduit portion to the common conduit portion, necessitating premature replacement of the common conduit portion due to hygiene concerns, despite its intended long-cycle usage.
Innovation Solution
A chemical liquid injecting apparatus with a control device that manages a flow blocking unit in the replaceable conduit portion or its boundary with the common conduit portion, switching between open and closed states based on pressure differentials or predetermined time periods to prevent backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common conduit portion is used for multiple subjects to reduce costs, then cost is reduced and device complexity is lowered, but body fluid backflow contamination occurs requiring premature replacement
Solution Approach 1:
The conduit system is divided into a replaceable conduit portion (subject-specific) and a common conduit portion (multi-use). The flow blocking unit is positioned at the boundary between these segments to prevent contamination of the common portion while allowing its repeated use across multiple subjects.
Solution Approach 2:
The flow blocking unit acts as an intermediary barrier between the replaceable conduit portion and the common conduit portion. This mediator prevents body fluid from the subject from backflowing into the common conduit portion, enabling hygiene safety while maintaining cost-effectiveness of the shared component.
2Reliability
If pressure differential is maintained to prevent backflow, then body fluid backflow is prevented, but device complexity increases due to pressure control mechanisms
Solution Approach 1:
The flow blocking unit operates automatically based on pressure differential without requiring external control systems. When pressure in the replaceable conduit portion exceeds that in the common conduit portion, the flow blocking unit self-activates to prevent backflow, eliminating the need for complex pressure control mechanisms.
Solution Approach 2:
The flow blocking unit responds to changes in pressure parameters automatically. The unit opens or closes based on the pressure differential between the two conduit portions, using physical parameter changes rather than mechanical control systems to regulate flow and prevent contamination.
3Reliability
If the flow blocking unit is always closed to prevent backflow, then hygiene safety is maintained, but chemical liquid injection is blocked
Solution Approach 1:
The flow blocking unit transitions from a static to a dynamic state, opening to allow chemical liquid flow during injection and closing to prevent body fluid backflow during withdrawal or idle periods. This dynamic behavior enables both efficient injection and hygiene safety without compromise.
Solution Approach 2:
The flow blocking unit operates in periodic cycles, alternating between open and closed states based on the injection process requirements. The unit opens during the injection phase to maintain productivity and closes during the withdrawal or pause phase to ensure hygiene safety, creating a rhythmic pattern of operation.
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
Prevents body fluid backflow into the common conduit portion, maintaining the integrity of the common conduit portion for long-cycle use and reducing unnecessary replacements.
Implementation Method 1
Because the flow of an incompressible fluid such as a liquid flows from a side on which pressure is high to a side on which pressure is low, a backflow can be prevented by keeping the pressure on the upstream side of a conduit higher than the pressure on the downstream side
Data Source
AI summary
In a chemical liquid injection conduit, there is a need to prevent a backflow of body fluid of a subject reaching the inside of a common conduit portion. This is solved by the chemical liquid injecting apparatus that includes: a common conduit portion that flows a chemical liquid from a chemical liquid injector to a replaceable conduit portion; a control device that controls the chemical liquid injector; and a flow blocking unit that is arranged inside the replaceable conduit or in a conduit of a boundary portion between the replaceable conduit and the common conduit portion, and by receiving a command from the control device, is switchable between an open state allowing a flow of the chemical liquid and a closed state blocking a flow of the chemical liquid.