Two-Pole Conductive Drawbar Central Alignment and Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for creating electrically conductive rod-like components within devices, such as tie rods, face issues with mechanical stability and reliability due to gaps between the rod and tube, which can lead to short circuits and contamination, especially in biomedical applications.
Innovation Solution
A method involving a holding device that aligns and clamps the rod within a tube, applying tension to straighten the rod, and filling the gap with a hardening liquid to ensure central positioning and insulation, eliminating the need for shrink tubing and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shrink tubing is used as insulation between the rod and tube, then electrical insulation is achieved, but gaps can form between the two electrical poles allowing dirt penetration
Solution Approach 1:
The patent changes the physical state of the insulating material from a pre-formed shrink tube to a liquid filling material that can be injected and hardened. This parameter change allows the insulating material to adapt to the exact gap dimensions and completely fill the space between rod and tube, eliminating gaps that would allow dirt penetration while maintaining electrical insulation.
Solution Approach 2:
The patent uses a composite approach by combining the liquid filling material with hardening agents to create a solid insulating structure. This composite material system allows the insulator to be formed in-situ within the gap, ensuring complete filling and secure bonding to both rod and tube surfaces, thereby preventing dirt ingress while providing reliable electrical insulation.
2Weight of moving object
If the rod is inserted into the tube with a small gap, then the device is lightweight and precise, but the tube can bend and contact the rod during manufacturing causing short circuits
Solution Approach 1:
The patent applies preliminary action by injecting the liquid filling material into the gap between rod and tube before final assembly completion. This allows the insulating material to be in place and hardened before the device undergoes normal use, preventing any potential contact between rod and tube during manufacturing and assembly processes while maintaining the lightweight design.
Solution Approach 2:
The liquid filling material acts as an intermediary substance between the rod and tube. It fills the gap completely and hardens to form a permanent insulating barrier, mediating the spatial relationship between the two conductive elements and preventing direct contact that would cause short circuits, while allowing the tube to maintain its thin-walled lightweight structure.
3Reliability
If plastic is used to fill the gap between rod and tube, then insulation is provided, but contacting areas created by bending cannot be filled causing short circuits
Solution Approach 1:
The patent employs a hydraulic approach by injecting the liquid filling material through injection ports into the gap between rod and tube. This fluid injection method allows the material to flow into all accessible gaps and contacting areas created by bending, ensuring complete filling of the entire gap volume including irregular spaces that solid plastic injection cannot reach, thereby providing comprehensive insulation.
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 approach enhances mechanical stability, prevents short circuits, and reduces contamination risks by maintaining insulation between the rod and tube, improving the quality and reliability of the two-pole electrically conductive pull rod for use in medical instruments.
Implementation Method 1
filling in the interim no together with a hardening liquid, the hardening liquid having an insulating effect at least in the hardened state, so that the rod is fixed centrally in the tube
Implementation Method 2
the rod being stretched either before or after the insertion or alignment by means of the tensioning device, so that a tensile force acts along the rod
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for manufacturing a two-pole electrically conductive pull rod with an electrically conductive rod inside an electrically conductive tube, wherein the tube's inner diameter is larger than the rod's diameter, comprising the following steps: - Inserting the tube into a holding device, wherein the holding device is configured such that the holding device contacts the tube on its outer surface, - Securing the rod in a clamping device, wherein the rod is aligned with respect to the holding device by means of the clamping device during securing such that the secured rod can be inserted centrally into the tube by means of the clamping device, - Centrally inserting the secured rod into the tube, wherein the tube's inner surface and the rod's outer surface are completely separated by a gap, so that the rod and the tube are free from contact.wherein the rod is tensioned either before or after insertion by means of the clamping device, so that a tensile force acts along the rod, and - filling the space with a hardening liquid or hardening granules, in particular plastic granules, wherein the hardening liquid or hardening granules have an insulating effect at least in the hardened state, so that the rod is fixed centrally in the tube and the two-pole electrically conductive pull rod is obtained, as well as an electrically conductive pull rod and a medical instrument, in particular a forceps system, especially an RF forceps system, or also an endoscope or exoscope.