Force Application Pumping Chamber for Reverse Flow Control
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Solution Overview
Problem
Existing portable fluid delivery devices for therapeutic compounds face challenges such as malfunction rates, size, weight, and cost, and require improved mechanisms for controlled release and reverse flow prevention.
Innovation Solution
A method and system utilizing a force application assembly with a pumping chamber and a tortuous flow-impedance conduit, actuated by a shape-memory actuator, to restrict retrograde flow and pressurize the chamber, ensuring unidirectional flow and adjustable dispensing rates through a patch-sized housing with integrated valves and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronically controlled portable devices are used for controlled release of therapeutics, then delivery precision is improved, but device complexity and malfunction rate increase
Solution Approach 1:
The patent replaces electronically controlled pumping mechanisms with a purely mechanical pumping system that uses a flexible membrane and diaphragm. The pumping action is achieved through mechanical compression of the membrane using a plunger or piston, eliminating the need for complex electronic motors and control circuits while maintaining precise delivery through mechanical means.
Solution Approach 2:
The patent employs a flexible membrane or diaphragm as the core pumping element. This thin film structure allows for simple mechanical actuation while achieving controlled fluid displacement. The flexibility of the membrane enables precise volume control through varying degrees of compression without requiring complex electronic mechanisms.
2Ease of operation
If wearable devices for automatic drug delivery are designed, then patient compliance is improved, but device size and weight increase
Solution Approach 1:
The use of flexible membranes as pumping elements significantly reduces device weight compared to rigid mechanical pumps or electronically controlled systems. The thin film structure requires minimal material while maintaining pumping functionality, making the device suitable for wearable applications.
Solution Approach 2:
The patent describes a disposable cartridge system where the reservoir and pumping mechanism are integrated in a single-use unit. This eliminates the need for heavy reusable components and allows the device to be lightweight while maintaining reliability, as each unit is self-contained and intended for limited use.
3Reliability
If passive valves are used for reverse flow prevention, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent incorporates passive check valves that automatically prevent reverse flow without requiring external control mechanisms. These valves open and close based on pressure differentials alone, providing reliable one-way flow control through self-actuating mechanical means rather than electronically controlled systems.
Solution Approach 2:
The patent integrates multiple functions into the flexible membrane structure itself. The membrane serves as both the pumping element and incorporates valve functionality through its design, eliminating the need for separate valve components and reducing overall device complexity while maintaining reliable flow control.
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 reliable, compact, and cost-effective automatic dispensing of therapeutic fluids, improving patient compliance by ensuring consistent and controlled delivery of medications like insulin, while preventing reverse flow and occlusions.
Implementation Method 1
actuated by a shape-memory actuator
Data Source
AI summary
A method of dispensing a therapeutic fluid from a line includes providing an inlet line connectable to an upstream fluid source. The inlet line is in downstream fluid communication with a pumping chamber. The pumping chamber has a pump outlet. The method also includes actuating a force application assembly so as to restrict retrograde flow of fluid through the inlet while pressurizing the pumping chamber to urge flow through the pump outlet. A corresponding system employs the method.