Priming Valve Threshold Opening for Accurate Bolus Flow Sensing
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Solution Overview
Problem
Current flow sensor systems face challenges in accurately measuring fluid flow and pressure during bolus delivery in medical devices, leading to potential medication errors and inconsistencies in fluid delivery.
Innovation Solution
A flow sensor system with a priming valve that includes a valve with a fluid flow path, a threshold pressure mechanism to open and allow fluid flow, and a connector that moves relative to the valve seat to ensure proper fluid flow and wetting of internal surfaces, enhancing ultrasonic signal transmission and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flow sensor internal surfaces are not fully wetted, then the device complexity is reduced, but the measurement precision deteriorates due to weak ultrasonic signal transmission
Solution Approach 1:
The priming valve performs preliminary wetting of the flow sensor internal surfaces before actual flow measurement begins. By pre-filling the flow path with fluid and removing air pockets, the ultrasonic transducers establish optimal acoustic coupling with the fluid, ensuring accurate measurements from the start of bolus delivery without requiring complex continuous wetting mechanisms
Solution Approach 2:
The priming valve utilizes the fluid pressure from the syringe plunger movement itself to open the valve and initiate the wetting process. The system self-activates when fluid pressure reaches the threshold, eliminating the need for external actuators or complex control mechanisms while achieving complete internal surface wetting
2Reliability
If a priming valve with threshold pressure mechanism is added, then the reliability of flow sensing is improved, but the device complexity increases
Solution Approach 1:
The connector serves a dual function: it acts as both the sealing element against the valve seat and the pressure-sensing element that triggers valve opening. When fluid pressure pushes the connector against the valve seat, the same pressure differential that seals the valve also signals when to open it, eliminating the need for separate pressure sensors or complex control circuits
Solution Approach 2:
The priming function is extracted as a separate, dedicated valve mechanism that operates independently from the main flow control system. This isolated priming valve handles only the initial wetting task, allowing the main flow sensor and delivery mechanisms to remain simple while achieving reliable sensor readiness through the specialized priming function
3Measurement precision
If the connector moves relative to the valve seat to allow fluid flow, then the fluid flow measurement accuracy is improved, but the loss of time increases due to priming process
Solution Approach 1:
The priming valve operates in a periodic manner: closed during normal operation, then opens briefly when fluid pressure reaches the threshold to perform wetting, then closes again. This periodic activation ensures complete internal surface wetting and air pocket removal in a single, timed cycle, maximizing ultrasonic signal strength without requiring prolonged priming periods
Solution Approach 2:
The system performs the wetting action at the optimal moment—when fluid pressure naturally builds to threshold during syringe loading. By timing the priming operation to coincide with natural pressure buildup rather than requiring separate priming steps, the system achieves complete wetting with minimal additional time
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 improves the accuracy of fluid flow measurement and pressure detection, reducing medication errors and ensuring consistent bolus delivery by fully wetting the internal surfaces of the flow sensor, thereby increasing ultrasonic signal strength by up to 180%.
Implementation Method 1
the connector is configured to move relative to the valve seat in response to a threshold pressure within the fluid flow path to allow the fluid to flow
Implementation Method 2
increasing ultrasonic signal strength by up to 180%
Data Source
AI summary
A priming valve includes a fluid flow path, a fluid inlet configured to couple to a fluid outlet of a fluid channel including at least one sensor configured to characterize at least one attribute of a fluid, a fluid outlet, a valve seat, and a connector. The connector engages the valve seat to prevent fluid flow via the fluid flow path. The connector is configured to move relative to the valve seat in response to a threshold pressure within the fluid flow path to allow the fluid to flow via the fluid flow path. A flow sensor sub-assembly for sensing flow of a fluidic medicament may include a priming valve and at least one sensor of a fluid port configured to characterize at least one attribute of a fluid within an administrable fluid source. A method for readying a fluid sensor may use a priming valve.