Shielded Electrode Connector for ECG Lead Noise Reduction
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Solution Overview
Problem
Medical electrodes face interference from electrostatic charges generated by clothing, bedding, and caregivers, which can distort low-intensity electrical signals from the body, such as those measured during electrocardiography and electroencephalography.
Innovation Solution
A shielded medical electrode with an electrostatic shield at the end of the lead conductor, encapsulated in a nonconductive dielectric covering, is used to protect the electrical connection from external electrostatic interference, ensuring noise-free signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode is connected to the medical instrument by a lead conductor without shielding, then the device complexity is reduced, but the electrode is susceptible to electrostatic interference from clothing, bedding, and caregivers
Solution Approach 1:
The electrical shield is nested within the connector housing, with the shielded electrode connector containing the lead conductor and shield assembly within an outer nonconductive housing. This nested structure provides electrostatic protection without requiring a separate external shield component, thus improving signal quality while controlling device complexity.
Solution Approach 2:
An electrical shield acts as an intermediary element between the electrode connection and external electrostatic sources. The shield, connected to ground through a ground path, intercepts electrostatic fields from clothing, bedding, and caregivers before they can couple capacitively to the signal conductor, thereby protecting the low-intensity bodily signals.
2Object-affected harmful factors
If an electrical shield is added to the connector, then electrostatic interference is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The electrical shield is constructed as a thin conductive layer or mesh that can be easily formed and integrated into the connector assembly. The shield may be implemented as a thin conductive film, braid, or mesh that conforms to the connector geometry, simplifying manufacturing compared to rigid shield structures while effectively blocking electrostatic interference.
Solution Approach 2:
The connector assembly combines multiple materials with complementary properties: a nonconductive dielectric housing material, a conductive shield material, and insulating materials for the lead conductor. This composite structure integrates electrostatic shielding functionality within the existing connector assembly without requiring entirely new manufacturing processes.
3Reliability
If the shield is extensively covered, then electrostatic protection is maximized, but the amount of material and device complexity increase
Solution Approach 1:
The electrical shield is strategically positioned to provide shielding coverage at the critical connection point where the lead conductor interfaces with the electrode. Rather than uniformly shielding the entire lead length, the shield is concentrated at the connector where capacitive coupling from external sources is most likely to occur, optimizing shielding effectiveness while minimizing material usage.
Solution Approach 2:
The shield provides sufficient coverage to achieve the necessary level of electrostatic protection for reliable signal acquisition. The shielding extends far enough to effectively block capacitive coupling from nearby electrostatic sources while avoiding excessive material usage that would occur with complete 360-degree coverage of the entire lead assembly.
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 shielding effectively reduces external electrostatic interference, enhancing the clarity and reliability of sensed electrical signals by maintaining a stable electrical potential and insulating against external hazards.
Implementation Method 1
An electrical shield is located at the end of the lead conductor which acts to shield the electrical connection when the lead conductor is coupled to the electrode
Implementation Method 2
The shield is encapsulated in a nonconductive dielectric covering
Data Source
AI summary
An ECG lead set is described which is shielded against electrostatic charge hazards. An electrical shield is located at the end of each lead of the lead set and electrically shields the connection of the lead set to an ECG electrode. The electrical shield is covered by a nonconductive cover and is electrically connected to the shield of the coaxial cable of the lead set.