CEW Fluid Ingress Detection Using Electrical Property Lockout

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Solution Overview

Problem

Existing conducted electrical weapons (CEWs) face challenges in detecting fluid ingress, which can affect their performance and safety, particularly when electrodes are spaced apart and do not ensure consistent neuromuscular incapacitation (NMI) due to varying electrode spacing and energy usage.

Innovation Solution

The CEW system incorporates methods to detect fluid ingress based on electrical properties, power supply circuit analysis, trigger circuit monitoring, and signal generator input/output analysis, enabling a lockout condition to prevent unsafe operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If electrodes are spaced apart to improve safety and reduce energy usage, then safety and energy efficiency are improved, but consistent neuromuscular incapacitation cannot be ensured

Engineering Contradiction:
ImprovesafetyVSAvoidconsistent neuromuscular incapacitation
Core Design Contradiction:
Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent implements a feedback mechanism by monitoring the electrical properties (impedance, voltage, current) of the circuit in real-time. The processing circuit compares detected electrical properties against expected ranges to determine if fluid ingress has occurred, allowing the system to adjust or prevent operation to maintain both safety and reliability

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent replaces mechanical measurement methods with electrical property detection. Instead of physically measuring electrode spacing or manual inspection for fluid ingress, the system uses electrical property monitoring (impedance, voltage, current analysis) to detect fluid presence and assess circuit health, enabling non-intrusive detection that maintains electrode spacing benefits

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If fluid ingress detection methods are added to CEW, then safety is improved, but device complexity increases

Engineering Contradiction:
Improvefluid ingress detection capabilityVSAvoiddetection system complexity
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent makes the existing electrical circuits serve multiple functions. The power supply circuit, trigger circuit, and signal generator are not only used for their primary functions but also for detecting fluid ingress by monitoring their electrical properties. This multi-functionality approach adds detection capability without requiring entirely separate detection hardware

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses its own existing electrical circuits and power supply to perform the detection function. The CEW monitors its own electrical properties (voltage, current, impedance) through its existing circuitry, eliminating the need for external detection equipment or additional power sources, thereby reducing overall system complexity

Inventive Principle:
Principle #25Self-service

3Device complexity

If existing CEW operate without fluid ingress detection, then device complexity is reduced, but safety and performance are compromised

Engineering Contradiction:
Improvesystem simplicityVSAvoidfluid ingress impact on safety and performance
Core Design Contradiction:
Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent performs preliminary detection of fluid ingress before it can compromise safety or performance. By continuously monitoring electrical properties and comparing them against expected ranges, the system identifies fluid presence early, allowing preventive action (such as preventing discharge or alerting the user) before fluid ingress causes harmful effects

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent replaces complex mechanical fluid detection methods (such as physical sensors, seals, or mechanical indicators) with electrical property monitoring. By detecting changes in electrical impedance, voltage, or current caused by fluid presence, the system achieves fluid ingress detection through the existing electrical circuitry, maintaining simplicity while improving safety

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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 detects fluid ingress, ensuring reliable neuromuscular incapacitation by adjusting energy delivery and preventing unsafe conditions, thereby enhancing safety and performance.

Implementation Method 1

a processing circuit configured to detect an electrical property of the CEW component

Methodology Applied
Scientific EffectElectrical property detection: Electrical Resistance

Implementation Method 2

conducted electrical weapon (CEW) configured to provide an electrical current having a voltage and a current through one or more electrodes

Methodology Applied
Scientific EffectElectrical energy delivery: Electrical Impedance Tomography

Data Source

PatentUS12535303B2Detecting fluid ingress in a conducted electrical weapon
Publication Date: 2026.01.27 AXON ENTERPRISE INC
  • US12535303B2 patent drawing
  • US12535303B2 patent drawing
  • US12535303B2 patent drawing

AI summary

A conducted electrical weapon (“CEW”) may be subject to one or more environmental factors during operation. The environmental factors may impact normal functionality of the CEW. The CEW may detect an electrical property associated with a component of the CEW. The CEW may retrieve a lockout parameter associated with the component. The CEW may compare the electrical property to the lockout parameter. The CEW may determine a lockout condition based on the comparing. The CEW may perform the lockout condition on the CEW.