Biomedical Electrode Eyelet Hot Pressing Process
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Solution Overview
Problem
Current manufacturing processes for biomedical electrodes require numerous steps and are inefficient in uniformly coating eyelets with conductive material, making it difficult to produce dimensionally stable and conductive eyelets.
Innovation Solution
A process involving hot pressing of electrically conductive thermoplastic or elastomeric resin to form a web of eyelets with non-polarizable conductive material applied only to the contact face, allowing for continuous production and improved robustness through thermal embedding and ink printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If injection molding process is used to produce eyelets, then dimensionally stable eyelets are produced, but the production process requires many steps and is complex
Solution Approach 1:
The patent combines multiple production steps into a single injection molding process. The eyelet, conductive material, and gel reservoir are all formed in one integrated molding operation, eliminating the need for separate coating and assembly steps. This merging of operations maintains dimensional stability while dramatically simplifying the production process.
Solution Approach 2:
The injection molded eyelet serves multiple functions simultaneously: it provides structural support, conducts electricity through embedded conductive material, and contains or interfaces with conductive gel. This multi-functionality is achieved through a single molded component rather than assembling multiple separate parts.
2Manufacturing precision
If injection molding process is used to produce eyelets, then dimensionally stable eyelets are produced, but the production process requires many steps and is time-consuming
Solution Approach 1:
The injection molding process operates continuously, with molten material being constantly injected, molded, and cooled in an uninterrupted cycle. This eliminates the discrete, batch-by-batch nature of traditional eyelet production methods, thereby increasing throughput and productivity while maintaining consistent dimensional quality.
3Reliability
If uniform silver coating is applied to all surfaces of glass filled eyelets, then conductivity is achieved, but the process becomes more complex and costly
Solution Approach 1:
Instead of uniformly coating all surfaces of the eyelet, the conductive material is strategically placed only where needed - embedded within the molded structure and applied to specific contact surfaces. This localized approach achieves the necessary electrical conductivity while reducing material costs and simplifying the coating process.
4Ease of manufacture
If selective coating of only one face is attempted, then cost and complexity are reduced, but uniform coating becomes difficult with conventional processes
Solution Approach 1:
The mold cavity is pre-configured with conductive material and surface features before the injection molding process begins. This preliminary preparation ensures that when the material is injected, the conductive coating is automatically and uniformly applied only to the intended contact face, eliminating the difficulty of selective coating that plagues conventional post-processing methods.
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
This method simplifies the production process, reduces costs, and enhances the robustness and conductivity of eyelets by applying non-polarizable conductive material selectively and uniformly, while maintaining or improving electrical signal conduction.
Implementation Method 1
the process permits thermally embedding the non-polarizable conductive material into the contact face increasing robustness of the non-polarizable conductive material layer
Implementation Method 2
hot pressing an electrically conductive thermoplastic or elastomeric resin to produce a film comprising a web of eyelets
Data Source
AI summary
A process for producing an eyelet for a biomedical electrode (e.g. an electrocardiogram (ECG) electrode) involves: hot pressing an electrically conductive thermoplastic or elastomeric resin to produce a film having a web of eyelets, each eyelet having a post protruding from a first face of the film and a flange at a second face of the film; applying a coating of a non-polarizable conductive material (e.g. a silver-containing material) on to a contact face of the flange; and, cutting the film to produce the eyelets separated from the web. Preferably, the process involves extrusion replication. A web of eyelets for biomedical electrodes has a film of an electrically conductive thermoplastic or elastomeric resin possessing a plurality of posts protruding from a first face of the film, and preferably a layer of a non-polarizable conductive material on a second face of the film. The process may be a one-step continuous process that is cheaper and simpler than current commercial processes.