Spring-Biased Valve Syringe for Pressure Limiting
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Solution Overview
Problem
Existing pressurizing syringes for medical procedures, particularly those involving balloon catheters, require complex pressure monitoring systems, which can be costly and unnecessary for less critical procedures that only need to deliver pressure up to a specific limit, leading to a need for a simpler, more cost-effective pressure-limiting mechanism.
Innovation Solution
A syringe with a spring-biased valve assembly that includes a valve spool with a valve seal or valve plug to limit pressure, ensuring the syringe delivers pressure only up to a predetermined limit, featuring a simple design with few parts, easy assembly, and ease of sterilization, without external bypass channels or bonded housing junctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a manometer is used to monitor pressure in the syringe, then pressure monitoring capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the pressure monitoring function from the main syringe body by incorporating a separate, integrated pressure gauge into the plunger assembly. This allows pressure monitoring capability to be added without significantly increasing overall device complexity, as the gauge is seamlessly integrated into the existing plunger structure rather than requiring separate external monitoring equipment
Solution Approach 2:
The plunger assembly is designed to serve multiple functions: it provides fluid displacement, pressure monitoring through the integrated gauge, and pressure limiting through the spring-biased valve mechanism. By combining these functions into a single integrated assembly, the patent avoids the need for separate components for each function, thereby reducing overall device complexity while maintaining comprehensive capability
2Reliability
If a spring-biased valve assembly is added to limit pressure, then pressure control capability is improved, but device complexity increases
Solution Approach 1:
The pressure limiting valve assembly is merged with the plunger assembly, combining the valve mechanism, spring bias, and pressure gauge into a single integrated unit. This integration ensures that pressure control and monitoring work together seamlessly without requiring separate systems, thereby improving reliability while minimizing the increase in device complexity
Solution Approach 2:
The spring-biased valve assembly operates automatically based on pressure differential,无需 external control or adjustment. The spring automatically opens or closes the valve port in response to pressure changes, providing self-regulating pressure control that enhances reliability without adding complex control mechanisms
3Device complexity
If a simple pressure-limiting mechanism is used instead of a manometer, then device complexity is reduced, but pressure monitoring capability is lost
Solution Approach 1:
The integrated pressure gauge in the plunger assembly serves dual purposes: it monitors pressure for user awareness and simultaneously provides feedback to the spring-biased valve mechanism for automatic pressure regulation. This multi-functionality ensures pressure monitoring capability is maintained while keeping the overall device simple and integrated
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 provides a reliable, cost-effective pressure-limiting mechanism that prevents over-pressure in medical procedures, ensuring safe tissue engagement and balloon expansion while reducing complexity and costs, offering a user-friendly and efficient delivery system.
Implementation Method 1
The valve assembly comprises a valve spool which is spring biased in the syringe body
Data Source
AI summary
A syringe which has an intended pressure limit. The syringe includes a syringe body, and a pressure-limiting mechanism is disposed inside the syringe body. The pressure-limiting mechanism may comprise a valve body which is spring biased in the syringe body. In one embodiment, the pressure-limiting mechanism is provided in the form the valve assembly having a valve seal which moves into sealing engagement with an internal wall of a valve bore in the syringe housing once the intended pressure limit is reached. In another embodiment, the pressure-limiting mechanism is provided in the form of the valve assembly having a valve seat which moves into sealing or plugged engagement with a valve plug once the intended pressure limit is reached. Regardless of the exact configuration, preferably the syringe is simple, reliable, easy to assembly, and easy to sterilize given its low number of parts.