Mechanical Needle Dislodgement Detection for Automatic Flow Termination
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Solution Overview
Problem
Existing vascular connection systems fail to reliably detect and automatically interrupt fluid flow when a vascular access needle becomes dislodged from a patient, posing a risk of dangerous conditions such as uncontrolled blood or medication leakage.
Innovation Solution
A needle safety system with a contact sensing mechanism that uses a spring-loaded activation mechanism or button-like sensor to detect dislodgement, triggering a flow termination mechanism, such as a pinch valve, rotary valve, or shuttle valve, to stop fluid flow without external power, ensuring sterility and disposability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuity sensor is used to detect needle dislodgement, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the sensing function from complex electronic continuity sensors and implements it through a simple mechanical skin contact sensor that detects needle dislodgement through direct physical contact with the patient's skin, eliminating the need for complex electrical sensing systems
Solution Approach 2:
The system uses the patient's own skin as the sensing element - when the needle is properly inserted, the skin contact sensor is activated; when the needle is dislodged, contact is lost and the alarm triggers, making the patient's body part of the detection mechanism itself
2Measurement precision
If mechanical connectors or electrical currents are used for monitoring connection fidelity, then detection accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces complex electrical current-based monitoring systems with a purely mechanical skin contact sensor system that uses physical contact and mechanical linkage to detect needle dislodgement and trigger flow termination
Solution Approach 2:
The system employs a disposable needle assembly with an integrated skin contact sensor that is discarded after single use, eliminating the need for complex reusable monitoring systems with electrical components that require calibration and maintenance
3Reliability
If a fluid stop valve is added to automatically stop flow upon dislodgement, then safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the skin contact sensor and the flow termination valve into a single integrated mechanical system where the sensor directly actuates the valve through mechanical linkage, eliminating the need for separate control systems or power sources
Solution Approach 2:
The system is pre-configured with a spring-loaded valve mechanism that is held in the open position during normal operation and automatically snaps to the closed position when the skin contact sensor detects needle dislodgement, providing immediate flow termination without requiring active control
4Reliability
If external power sources like batteries are used, then sensing capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The system uses the mechanical energy from the spring-loaded valve and the physical contact with the patient's skin to operate the sensing and termination mechanisms, completely eliminating the need for external power sources like batteries or cables
Solution Approach 2:
The needle assembly with integrated skin contact sensor is designed as a disposable component that can be manufactured using simple high-volume injection molding processes, eliminating the need for complex electronic components and power sources
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 effectively and automatically stops fluid flow upon needle dislodgement, preventing leakage and raising back pressure to trigger alarms, suitable for medical environments without requiring batteries or extensive training.
Implementation Method 1
a spring-loaded activation mechanism or button-like sensor to detect dislodgement
Implementation Method 2
triggering a flow termination mechanism, such as a pinch valve, rotary valve, or shuttle valve, to stop fluid flow
Data Source
AI summary
Systems and methods for automatic flow termination for fluid delivery, including a housing configured for coupling a fluid delivery tube to a needle configured for subcutaneous delivery of fluid within a tissue of a patient and a spring-loaded activation mechanism having a first orientation corresponding to a condition where the housing is disposed substantially adjacent to the tissue and the needle lodged within the tissue and a second orientation corresponding to a condition where the housing is disposed away from the tissue or the needle being dislodged from the tissue. A flow termination mechanism is coupled to the activation mechanism and having an open configuration allowing flow from the fluid delivery tube to the needle when the activation mechanism is in the first orientation and a closed configuration substantially terminating flow from the fluid delivery tube to the needle when the activation mechanism is in the second orientation.