Wrist Electrode Strap Structure for Stable Conductive Contact
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Solution Overview
Problem
Wrist-worn medical devices with metal or conductive rubber electrodes experience poor contact comfort and high interface resistance, leading to prickling sensations and reduced therapeutic effectiveness due to positional offset during physical activities.
Innovation Solution
A wrist-worn medical device with conductive sponges and sheets stabilized by a limiting member, ensuring consistent contact through an annular or grooved structure that maintains conductivity during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrode plates are used to ensure good conductivity, then electrical conductivity is improved, but contact comfort with skin deteriorates due to hardness
Solution Approach 1:
The patent uses conductive rubber as a composite material that combines the electrical conductivity of metal with the flexibility and comfort of rubber. The conductive rubber electrode plates maintain good electrical connection while being soft enough to comfortably contact skin, resolving the contradiction between conductivity and comfort.
Solution Approach 2:
The patent changes the material parameter from metal to conductive rubber, transforming the electrode from rigid and uncomfortable to flexible and comfortable while maintaining electrical conductivity through the addition of conductive additives to the rubber matrix.
2Object-affected harmful factors
If conductive rubber electrode plates are used to improve comfort, then contact comfort is improved, but interface resistance increases leading to prickling sensation
Solution Approach 1:
The patent optimizes the conductivity parameters of the conductive rubber by adjusting the type, amount, and distribution of conductive additives (such as carbon black, copper powder, or metal foils) within the rubber matrix to reduce interface resistance while maintaining comfort.
Solution Approach 2:
The patent introduces conductive paste or conductive gel as an intermediary substance between the conductive rubber electrode and the skin. This intermediary layer further reduces interface resistance and improves electrical contact, eliminating the prickling sensation caused by high resistance.
3Reliability
If connection strap is tied tightly to prevent position offset during exercise, then conductivity stability is improved, but blood circulation deteriorates
Solution Approach 1:
The patent employs elastic bands or flexible connection straps that can dynamically adjust their tightness. The elastic components provide sufficient restraint to prevent electrode displacement during exercise while maintaining enough flexibility to allow blood flow, resolving the contradiction between stability and circulation.
Solution Approach 2:
The patent applies different fastening tightness to different regions of the connection strap. The electrode-contact area is secured firmly to maintain conductivity stability, while other portions of the strap remain loose to preserve blood circulation, implementing localized quality control.
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
Improves conductivity stability and comfort by preventing relative sliding of electrodes, reducing prickling sensations, and maintaining therapeutic effectiveness during exercise.
Implementation Method 1
the conductive sponges are configured for abutting against and conducting with conductive sheets
Implementation Method 2
After the electrode strap is fixed on a wrist through hydrogel
Data Source
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AI summary
Disclosed is a wrist-worn medical device. The wrist-worn medical device includes: an electrode strap, provided with conductive sponges, where the conductive sponges are configured for abutting against and conducting with conductive sheets; a connection strap, provided with the conductive sheets, where the connection strap is further electrically connected to a host, the conductive sheets are electrically connected to the host, and the host and the conductive sheets are respectively arranged on both sides of the connection strap along its thickness direction; and a limiting member, arranged on the connection strap, where when the connection strap abuts against the electrode strap, both the conductive sponges and the conductive sheets are located inside the limiting member.