Infusion Flow Indicator Using Pre-Biased Spring Mechanism
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Solution Overview
Problem
Current catheter-based infusion systems face challenges in detecting alterations or interruptions in fluid flow rates, especially at low flow rates, due to issues with traditional manometers that require periodic interruption of flow and are cumbersome or difficult to read, especially at low pressures.
Innovation Solution
A pre-biased indicator system integrated into the catheter-based infusion system that provides a discrete visual signal when the fluid pressure deviates from a predetermined level, using a flexible sleeve and biasing element to indicate changes in flow conditions, allowing for easy detection of flow alterations without the need for complex pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional hydrostatic manometers are used to measure fluid pressure, then pressure measurements can be obtained, but the fluid flow must be periodically interrupted which is inconvenient and may be hazardous
Solution Approach 1:
The patent pre-loads a compression spring with potential energy before use. When fluid flows through the device, the spring automatically decompresses and drives the indicator sleeve to move, providing pressure indication without interrupting the flow. This preliminary energy storage resolves the contradiction by enabling measurement action without operational interruption.
Solution Approach 2:
The invention maintains continuous fluid flow through the device while simultaneously providing pressure measurements. The spring-loaded indicator mechanism operates continuously as fluid passes through, eliminating the need to stop flow for measurements and thus maintaining the continuity of the therapeutic action.
2Measurement precision
If in-line hydrodynamic manometers with pressure-measuring chambers are used, then pressure can be measured continuously, but the apparatus becomes large and cumbersome requiring support on a stand
Solution Approach 1:
The patent nests the indicator sleeve and spring mechanism within the existing catheter or tubing structure. The indicator components are contained within the fluid flow path itself, eliminating the need for external stands or separate measurement apparatus and thus reducing the overall volume requirement.
Solution Approach 2:
The invention combines the pressure measurement function with the existing fluid delivery catheter or tubing. The indicator mechanism is integrated into the flow path rather than being a separate external device, merging measurement and delivery functions into a single compact unit.
3Measurement precision
If traditional manometers with multiple pressure markings are used, then detailed pressure readings can be obtained, but the scale is clinically unnecessary and complicates the device
Solution Approach 1:
The patent extracts only the essential flow state information from the full pressure measurement spectrum. Instead of displaying continuous pressure values with multiple markings, the device provides discrete indicators for the three clinically relevant flow states, removing unnecessary measurement detail while retaining clinical utility.
Solution Approach 2:
The invention applies different levels of measurement detail to different clinical needs. Rather than providing uniform detailed measurement across all pressure ranges, it provides discrete qualitative indicators specifically tailored to the three critical flow states, optimizing the information provided for actual clinical decision-making.
4Manufacturing precision
If flow rates are reduced to low levels (1-14 cc/hr) for precise medication delivery, then medication dosing accuracy improves, but detection of flow alterations becomes difficult
Solution Approach 1:
The patent replaces direct visual observation of fluid flow with a mechanical spring-loaded indicator system. The spring mechanism amplifies subtle pressure changes that occur at low flow rates, converting them into visible indicator movements that can be easily detected, thus solving the detection difficulty while maintaining low flow rates for accurate dosing.
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
Enables continuous and reliable detection of fluid flow conditions, providing a simple and accurate visual signal for healthcare providers and patients, ensuring consistent medication delivery even at low flow rates and pressures.
Implementation Method 1
a biasing element configured to store energy and deform at a predetermined pressure so the flexible sleeve moves from a first position to a second position
Data Source
AI summary
A device for dispensing fluid to a patient and indicating a fluid flow condition. The device includes a reservoir configured to provide a source of fluid under pressure. A continuous flow path in fluid communication with the source of fluid provides a continuous and substantially constant flow rate of fluid from the source to a patient. The device further includes at least one pre-biased indicator in fluid communication with the continuous flow path. The pre-biased indicator is configured to provide a discrete visual signal that the pressure of the fluid in the continuous flow path is different from a predetermined level of pressure, thereby indicating a fluid flow condition.