Partitioned Liquid Collection Bag for Extracorporeal Priming

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Solution Overview

Problem

Existing extracorporeal circuits face challenges in efficiently collecting priming solutions during retrograde autologous priming (RAP) due to pressure fluctuations in collection bags, leading to incomplete collection and blood dilution during extracorporeal circulation.

Innovation Solution

A liquid collection bag with a partitioned interior and communication tube system that utilizes pressure differences to effectively collect priming solutions by introducing them into separate compartments, preventing excessive backflow and ensuring reliable collection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a simple collection bag is used to collect priming solution, then the device complexity is reduced, but the collection reliability deteriorates due to pressure fluctuations causing involuntary backflow

Engineering Contradiction:

Improvecollection bag structureVSAvoidcollection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The collection bag is divided into a first space and a second space by a partition, with the introduction part extending into the first space and the communication part connecting both spaces. This segmentation allows the priming solution to be introduced into the first space and then flow to the second space through the communication part, preventing direct pressure fluctuations from causing backflow while maintaining collection functionality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The communication part acts as an intermediary between the first space and the second space, allowing controlled flow of priming solution while preventing direct communication that would cause pressure fluctuations. This intermediary structure enables reliable collection by mediating the pressure transmission between spaces

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of stationary object

If the storage space volume increases rapidly during priming solution collection, then the collection capacity is improved, but the pressure decreases causing excessive involuntary drawing of priming solution

Engineering Contradiction:

Improvestorage space volumeVSAvoidpriming solution quantity

Core Design Contradiction:

Volume of stationary objectVSQuantity of substance

Solution Approach 1:

By dividing the collection bag into two spaces with a partition, the system controls the flow path of priming solution. The introduction part extends into the first space, and the communication part connects to the second space, ensuring that priming solution flows in a controlled manner rather than causing rapid volume expansion that would lead to excessive drawing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The introduction part is pre-positioned to extend into the first space before priming solution collection begins. This preliminary positioning ensures that priming solution is introduced into the first space first, then flows to the second space through the communication part, preventing excessive drawing from the outset

Inventive Principle:

Principle #10Preliminary action

3Quantity of substance

If blood is drawn in opposite direction for retrograde autologous priming, then the priming solution collection is improved, but the blood dilution increases due to incomplete collection

Engineering Contradiction:

Improvepriming solution collectionVSAvoidblood dilution

Core Design Contradiction:

Quantity of substanceVSLoss of substance

Solution Approach 1:

The collection bag with partition and communication part structure ensures complete priming solution collection, allowing the priming solution to be fully recovered and reused. This complete collection prevents blood dilution that would occur with incomplete collection, making the RAP process effective

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 enables efficient and complete collection of priming solutions, reducing blood dilution and facilitating reliable extracorporeal circulation by maintaining stable pressure within the collection bag, thus preventing involuntary backflow and ensuring proper priming solution quantity.

Implementation Method 1

The interior of the liquid collection bag is adapted to receive and collect liquid from the storage container based on a difference in pressure between an inside of the liquid collection bag and an inside of the storage container

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Implementation Method 2

the collection bag, the one formed by fusing the edges of two sheet materials having flexibility is usable

Methodology Applied

Scientific EffectFlexibility: Elasticity

Data Source

PatentUS9011360B2Liquid collection container and extracorporeal circuit

Publication Date: 2015.04.21 TERUMO KK

AI summary

A liquid collection bag is used as a part of an extracorporeal circuit and is connected via a tube to a storage container containing a priming solution. The collection container collects the priming solution from the storage container by a pressure differential between the pressure inside the collection container and the pressure inside the storage container. The liquid collection container is a flexible bag body having a partition part dividing the inside of the bag body into a first space and a second space. In addition, a communication part communicates the first space with the second space.