Automated Electrosurgical Pencil Switch Assembly and Reusable Conductor Design
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Solution Overview
Problem
Current electrosurgical pencils require partial manual assembly, leading to increased costs and inefficiencies due to the need for human handling and selection of small electrical components, and the entire device is often discarded after use, resulting in resource wastage.
Innovation Solution
The development of an automated assembly process for electrosurgical pencil switches and conductors, where unitary metal frames are stamped and molded with plastic components to form a switch that can be fully assembled without human intervention, allowing for the reuse of high-quality conductors and the disposal of low-cost hand pieces after single use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual assembly is used for electrosurgical pencil components, then assembly flexibility and component selection are improved, but manufacturing costs increase and productivity decreases
Solution Approach 1:
The electrosurgical pencil is divided into modular components: a reusable conductor assembly and a disposable handpiece assembly. The handpiece includes segmented sub-components (switch, cabinet, housing) that can be pre-assembled and tested automatically, then quickly attached to the conductor. This segmentation enables automated manufacturing of modules while maintaining assembly flexibility through modular connection.
Solution Approach 2:
The switch assembly (including metal frames, conductive components, and cabinet) is pre-assembled and pre-tested using fully automated assembly equipment before being integrated into the final handpiece. This preliminary automated assembly improves productivity by performing complex operations beforehand, while the final integration step maintains flexibility for quality control and customization.
2Reliability
If entire electrosurgical pencil is discarded after use, then reliability and sterility are improved, but resource wastage increases
Solution Approach 1:
The system implements selective discarding and recovery: the disposable handpiece assembly (containing switch, cabinet, and housing) is discarded after single use to ensure sterility and eliminate cross-contamination risks, while the expensive conductor assembly (containing high-quality electrical conductors) is recovered, sterilized, and reused with new handpiece assemblies. This approach maintains reliability through single-use sterile components while reducing resource wastage by preserving valuable materials.
Solution Approach 2:
The handpiece assembly is designed as a low-cost disposable component that can be manufactured economically using automated processes with standard materials. Its low cost enables single-use disposal for sterility assurance, while the expensive conductor assembly uses high-quality reusable materials that justify investment through multiple reuse cycles.
3Productivity
If automated assembly is implemented, then productivity and cost efficiency are improved, but device complexity increases
Solution Approach 1:
The automated assembly process is segmented into distinct stages: conductor preparation, switch assembly fabrication, cabinet integration, and final handpiece assembly. Each stage uses specialized automated equipment optimized for specific tasks, reducing overall system complexity compared to a single complex automated line. The segmentation also allows incremental implementation and easier maintenance of automation systems.
4Ease of manufacture
If high-quality conductors are reused, then cost savings are improved, but contamination risk increases
Solution Approach 1:
The conductor assembly is separated from the disposable handpiece and designated for recovery and reuse. After the handpiece is discarded, the conductor can be recovered, subjected to controlled sterilization processes, and reused with new handpiece assemblies. This separation enables cost savings through conductor reuse while managing contamination risk through systematic sterilization protocols applied only to the reusable portion.
Solution Approach 2:
The high-value conductor assembly is extracted as a separate reusable component from the disposable handpiece assembly. This extraction allows the conductor to be removed, sterilized independently, and reused, while the potentially contaminated handpiece components (switch, cabinet, housing) are discarded. The separation enables cost efficiency through conductor reuse while eliminating contamination risk through disposal of single-use sterile components.
Data Source
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AI summary
Formation of an assemblage of electrically conductive components for a new electrosurgical pencil is disclosed, and assembly of those components in a method for automating the manufacture and combination of current carrying metal circuitry and operable switching components in "electrosurgical pencils" which supply current to an active terminal, for application of high frequency or high power electrical current to a surgical site, and control of such current through coaction of the elements of the switch. In manufacture, the design of the switch components allows start-to-finish automated assembly of the switch, whereby an array of identical multiple metal "frames" may be formed from a reel, then each frame separated and enclosed within molded plastic, and the resulting cabinet joined with a housing to create an inexpensive hand piece, for use with a high quality, reusable cable and plug assembly.