Infusion Pump Flow Detection via Pneumatic Cassette Sensing

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Solution Overview

Problem

Current drug delivery systems for home-based administration are time-consuming, prone to errors, and involve complex processes with potential contamination, particularly in therapies requiring multiple drugs.

Innovation Solution

A compact, portable drug delivery system comprising a single-use cassette with collapsible drug delivery bags and a reusable pump module, utilizing a pneumatic interface for drug administration, which eliminates the need for electronic sensors in the cassette by indirectly determining drug volume and flow rate through a pneumatic interface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional injection or infusion methods are used, then drug administration can be achieved, but the process is time-consuming and complex with potential for errors and contamination

Engineering Contradiction:

Improvedrug administration efficiencyVSAvoidcomplexity of administration process

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs a disposable single-use cassette containing pre-filled collapsible drug delivery bags. This eliminates the need for complex reusable systems with multiple components, reducing both device complexity and contamination risk while maintaining efficient drug administration. The cassette is discarded after single use, eliminating cleaning and sterilization steps.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The system divides the drug delivery function into separate components: a reusable pump module and a disposable cassette with individual collapsible bags for each drug. This segmentation allows the complex pumping mechanism to be reused while the potentially contaminated single-use portion is discarded, improving both efficiency and safety.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If electronic sensors are used in the cassette to detect drug volume and flow, then accurate measurement is achieved, but the device complexity and contamination risk increase

Engineering Contradiction:

Improvedrug volume and flow detection accuracyVSAvoidcomplexity of sensing system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent introduces air as an intermediary medium between the pump and the drug. A collapsible drug delivery bag is placed in a chamber and pressurized with air, causing the drug to flow out. By measuring the air pressure and volume changes, the system indirectly determines drug volume and flow rate without requiring electronic sensors in contact with the drug, thus maintaining measurement precision while reducing complexity and contamination risk.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces electronic sensing systems with a pneumatic measurement approach. Instead of using electronic sensors to directly detect drug volume and flow, the system uses air pressure measurements and volume calculations to indirectly determine these parameters, eliminating the need for complex electronic components in the disposable cassette.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If multiple drugs are administered through separate procedures, then each drug can be delivered accurately, but the overall process becomes time-consuming and error-prone

Engineering Contradiction:

Improvedrug delivery accuracyVSAvoidtotal administration time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent combines multiple drug delivery functions into a single integrated disposable cassette. Each drug is contained in its own collapsible bag within the same cassette, allowing all drugs to be administered through one pump module connection. This merging reduces the number of connection and setup steps, decreasing total administration time while maintaining accurate delivery through the unified pneumatic system.

Inventive Principle:

Principle #5Merging (Combining)

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 system simplifies drug delivery by reducing steps, minimizing contamination risk, and enabling accurate drug administration with real-time volume estimation and flow detection, allowing patients to carry and use the system conveniently.

Implementation Method 1

A method for detecting drug flow in a drug delivery system includes pressurizing a pressure chamber in which a collapsible drug delivery bag is disposed to force drug flow from the collapsible drug delivery bag

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

A method for detecting drug flow in a drug delivery system includes measuring a pressure in the pressure chamber

Methodology Applied

Scientific EffectPressure measurement:

Data Source

PatentUS20260027293A1Flow detection for infusion pump

Publication Date: 2026.01.29 TAKEDA PHARMA CO LTD

AI summary

A drug delivery system includes a single-use cassette driven by a reusable pump module. The cassette includes one or more drug delivery bags disposed in a pressure chamber. A pump pressurizes the pressure chamber through a pneumatic interface between the pump module and cassette to dispense the drug from the drug delivery bags into a valve block assembly and through an outlet port.