Tangential Conductor Feedthrough for Hermetic Sealing
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Solution Overview
Problem
Existing cable bushings for electrical functional units, particularly in medical implants, face challenges in achieving reliable and easy production, especially for difficult-to-handle conductor connections, while maintaining high tightness and hermeticity.
Innovation Solution
A cable bushing design featuring a gap in the flange for tangential insertion and fixation of conductors, using a separately manufactured pressure piece and a plastic plug to ensure tight sealing, with options for welding or cold-welding methods, and injection-molded plastic for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cable bushings are used with conductors inserted through the flange, then the structure is simple, but the handling of conductors is difficult and reliability is reduced
Solution Approach 1:
The patent changes the insertion direction of conductors from axial (through the flange) to tangential (along the peripheral surface). The gap is formed by the pressure piece pressing against the flange base body, creating a tangential insertion path that simplifies conductor handling while maintaining connection reliability through welding or cold-welding in the gap area.
2Reliability
If hermetic sealing is achieved through complex sealing structures, then tightness is improved, but device complexity increases
Solution Approach 1:
The patent introduces a plastic plug as an intermediary sealing element that is injection-molded into the cavity of the flange. This plastic plug fills the space around the contact piece and provides hermetic sealing between the conductor connection area and the internal cavity, achieving tightness without complex mechanical sealing structures.
Solution Approach 2:
The patent uses injection molding to create the plastic plug, changing the manufacturing parameter from mechanical assembly to chemical/thermal processing. This allows for precise positioning and tight sealing through the injection-molded plastic material that adapts to the cavity geometry, simplifying the overall sealing structure.
3Manufacturing precision
If precise positioning of components is achieved through complex positioning mechanisms, then manufacturing precision is improved, but ease of manufacture decreases
Solution Approach 1:
The pressure piece is pre-positioned in a predetermined position relative to the flange base body during manufacturing. This preliminary positioning establishes the gap geometry before conductor insertion, ensuring precise positioning without complex adjustment mechanisms during assembly.
Solution Approach 2:
The patent replaces complex mechanical positioning systems with a combination of the pressure piece's predetermined position and injection-molded plastic plug. The plastic material's flow and curing characteristics provide automatic positioning and fixation, eliminating the need for additional mechanical positioning components.
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 solution enables reliable and efficient production of cable bushings with high reliability and tightness, suitable for complex conductor configurations, including medical implants, by providing a simple and productive method for achieving hermetic seals and precise positioning.
Implementation Method 1
The cavity of the flange is filled with a plug of injection-mouldable plastic which tightly encloses the contact piece and also tightly fits against the inner wall of the flange
Implementation Method 2
the conductor or conductors of the first type is or are welded to the flange in or at the gap
Implementation Method 3
the conductor or conductors of the first type are inserted into the gap and cold-welded by pressing the contact piece onto the flange base body
Data Source
Figure 1
Figure 2~3
Figure 4A~4C
AI summary
Conductor feedthrough of an electrical functional unit, in particular a capacitor or medical electronic implant, which has a hollow conductive flange and a contact piece arranged in its cavity and electrically insulated and sealed from the flange, wherein the flange can be connected to a conductor of a first type and the contact piece to a conductor of a second type in the functional unit, wherein a tangentially extending gap is provided in a circumferential section of the flange, bounded on one side by a flange base body and on the other side by a separate pressure piece, for the tangential insertion and fixing of the conductor of the first type.