Pressure Valve Pin Mechanism for Threshold-Based Medical Dosing
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Solution Overview
Problem
Medical fluid delivery systems face challenges in accurately controlling the release of medical agents using pressurized fluids, requiring precise dosing and metering to ensure safe and effective delivery to target sites.
Innovation Solution
A medical device with an enclosure having separate chambers and a pin mechanism that moves based on pressure thresholds, allowing controlled release of pressurized fluid and preventing agent release until sufficient pressure is reached, ensuring accurate delivery of the agent to the target site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin mechanism is used to block the outlet, then the medical agent delivery is controlled and prevented until sufficient pressure is reached, but the device complexity increases
Solution Approach 1:
The pin mechanism automatically responds to pressure changes without external control. When the pressurized fluid reaches the threshold pressure, the pin is forced distally by the pressure differential, automatically opening the outlet. This self-actuating mechanism ensures reliable controlled release while minimizing the need for complex external control systems.
Solution Approach 2:
The device uses the pressure of the pressurized fluid itself to actuate the pin mechanism. The fluid pressure differential between the first chamber (containing pressurized fluid) and second chamber (containing medical agent) provides the force to move the pin from blocking to open position, eliminating the need for separate actuation systems.
2Measurement precision
If the pin is positioned to allow fluid flow but block material, then precise dosing is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The membrane separating the first and second chambers is configured as a porous structure with specific pore sizes. The pin includes a protrusion that aligns with the membrane apertures in a third position, allowing pressurized fluid to pass through the porous membrane while blocking the larger medical agent particles. This porous membrane design provides precise dosing control while being more tolerant to manufacturing variations than precision-machined clearance gaps.
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 device enables precise and controlled delivery of medical agents by regulating the pressure of the pressurized fluid, ensuring the agent is released only when the pressure exceeds a specific threshold, thereby ensuring accurate and safe dosing to the target site.
Implementation Method 1
The pin may be configured to move from the first position when a pressure of the pressurized fluid exceeds a pressure threshold
Implementation Method 2
The device may further include a spring, wherein the spring may be configured to urge the pin in the first position
Data Source
AI summary
A medical device for delivering a material using a pressurized fluid includes an enclosure having a first chamber and a second chamber separated by a membrane, and an outlet, and a pin configured to move within the enclosure between a first position and a second position, where a proximal end of the pin blocks the outlet when the pin is in the first position.