Injection Conduit Flow Blocking for Body Fluid Backflow Isolation

Solution Overview

Problem

The challenge in chemical liquid injection systems is the backflow of body fluids from the replaceable conduit portion to the common conduit portion, necessitating premature replacement of the common conduit, which is designed for longer cycles, due to contamination risks.

Innovation Solution

A chemical liquid injecting apparatus with a control device that manages a flow blocking unit within 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

VSEngineering Contradiction Analysis

1Loss of substance

If the common conduit portion is designed for long-cycle replacement to reduce costs, then cost efficiency is improved, but body fluid backflow contaminates the common conduit portion requiring premature replacement

Engineering Contradiction:

Improveconduit replacement frequencyVSAvoidbackflow contamination

Core Design Contradiction:

Loss of substanceVSObject-affected harmful factors

Solution Approach 1:

The conduit system is divided into two distinct segments: a replaceable conduit portion that contacts the subject and is replaced frequently, and a common conduit portion that remains in the apparatus and is replaced infrequently. This segmentation isolates the contamination risk to the replaceable portion, protecting the common portion from backflow contamination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A flow blocking unit is introduced as an intermediary component between the replaceable conduit portion and the common conduit portion. This flow blocking unit prevents backflow from reaching the common conduit portion, acting as a protective barrier that maintains the integrity of the common conduit for long-cycle use.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the flow blocking unit is positioned in the common conduit portion, then backflow prevention is improved, but the replaceable conduit portion cannot be easily replaced

Engineering Contradiction:

Improvebackflow preventionVSAvoidconduit replacement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The conduit system is divided into two distinct segments: a replaceable conduit portion that contacts the subject and is replaced frequently, and a common conduit portion that remains in the apparatus and is replaced infrequently. This segmentation isolates the contamination risk to the replaceable portion, protecting the common portion from backflow contamination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A flow blocking unit is introduced as an intermediary component between the replaceable conduit portion and the common conduit portion. This flow blocking unit prevents backflow from reaching the common conduit portion, acting as a protective barrier that maintains the integrity of the common conduit for long-cycle use.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If pressure control is maintained continuously to prevent backflow, then backflow prevention is improved, but energy consumption increases

Engineering Contradiction:

Improvebackflow preventionVSAvoidpressure control energy

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The flow blocking unit is activated in advance of potential backflow conditions, creating a preliminary barrier that prevents backflow before it can occur. This eliminates the need for continuous high-pressure control to prevent backflow, reducing energy consumption while maintaining reliability.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

Instead of continuous pressure control, the system uses periodic or conditional activation of the flow blocking unit based on injection cycles. The flow blocking unit is activated during injection phases and can be deactivated during idle periods, reducing overall energy consumption while maintaining backflow prevention when needed.

Inventive Principle:

Principle #19Periodic action

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 backflow of body fluids into the common conduit portion, maintaining the integrity of the common conduit for longer cycles by ensuring the flow blocking unit operates when pressure conditions are met, thus reducing unnecessary replacements.

Implementation Method 1

a clamping mechanism that crushes a flexible tube to block off a predetermined location of a flow path that supplies a chemical liquid is disclosed. The clamping mechanism crushes the flexible tube with a clamp member to enable injection of a predetermined chemical liquid according to a predetermined procedure.

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS20260077121A1Chemical liquid injecting apparatus

Publication Date: 2026.03.19 CIRCULUS INC

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.