Electrosurgical Jaw Assembly With Insulated Knife Channel Alignment
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Solution Overview
Problem
There is a continuing need for tightly-toleranced jaw assembly components that can be readily integrated into manufacturing assembly processes for electrosurgical instruments, with a requirement for low-cost production and reduced complexity in machining operations. Additionally, there is a need for improved thermal resistance, strength, and rigidity of jaw assemblies, along with effective regulation of the gap distance between opposing jaw assemblies to prevent short circuiting and enhance tissue gripping and manipulation.
Innovation Solution
The proposed solution involves a jaw assembly design that includes an electrically-conductive tissue-engaging structure, a jaw member with a support base, and a non-electrically conductive member that electrically isolates the conductive tissue-engaging structure from the jaw member. This design cooperatively defines a longitudinally-oriented knife channel and utilizes a brazing process to join the components, facilitating the formation of a reliable electrosurgical instrument with improved thermal resistance and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex machining operations are used to achieve tightly-toleranced jaw assembly components, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The jaw assembly is divided into multiple components (jaw member, insert, tissue-engaging structure) that are manufactured separately using simpler processes, then assembled together. This segmentation allows each component to be made with less complex machining while achieving the required overall precision through the assembly process and fixture-based alignment.
Solution Approach 2:
The patent replaces complex precision machining operations with a brazing-based assembly process that uses fixtures to maintain alignment. Instead of machining all features to tight tolerances, the mechanical alignment is achieved through the fixture system during assembly, substituting complex mechanical machining with a simpler thermal joining process.
2Manufacturing precision
If complex machining operations are used to achieve tightly-toleranced jaw assembly components, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the jaw assembly into separately manufactured components, each piece can be produced using less expensive, simpler machining operations. The cumulative cost of multiple simpler operations is lower than the cost of machining a single integrated component to the same tight tolerances.
Solution Approach 2:
The patent substitutes expensive precision machining with a brazing process that uses alignment fixtures. The cost of fixtures and brazing materials is lower than the cost of complex multi-step machining operations required to achieve the same alignment precision in a single component.
3Reliability
If electrically conductive materials are used for the tissue-engaging structure, then electrical conductivity is improved, but risk of short circuiting increases
Solution Approach 1:
The electrically conductive tissue-engaging structure is extracted as a separate component from the jaw member. This separation allows the conductive structure to be isolated electrically from the jaw member through the insert and brazing interface, reducing the risk of short circuits while maintaining the necessary electrical function for tissue engagement.
Solution Approach 2:
The insert acts as an intermediary between the conductive tissue-engaging structure and the jaw member. This intermediate component provides electrical isolation while maintaining mechanical connection, allowing the conductive structure to function without directly contacting the jaw member, thereby reducing short circuit risk.
4Object-affected harmful factors
If gap distance between opposing jaw assemblies is reduced to prevent short circuiting, then electrical safety is improved, but tissue gripping capability deteriorates
Solution Approach 1:
The tissue-engaging structure is extracted as a separate conductive component that can be positioned close to the opposing jaw without requiring the jaw members themselves to be close. This extraction allows the gap between jaw members to be larger for better tissue access while the actual tissue-engaging surfaces remain close for effective gripping and electrical contact.
Solution Approach 2:
The patent separates the dimensional requirements for electrical safety and tissue gripping by positioning the conductive tissue-engaging structures in a different spatial relationship than the jaw members. The jaw members can be spaced apart for tissue access while the actual engaging surfaces are positioned close together through the separate component architecture.
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 described jaw assembly design effectively meets specific tolerance requirements for proper jaw alignment and other tightly-toleranced features, reducing the chances of short circuiting and enhancing the gripping and manipulation of tissue. The improved thermal resistance, strength, and rigidity of the jaw assemblies contribute to the reliability and effectiveness of the electrosurgical instruments, while the manufacturing process achieves these results at a lower cost and with reduced complexity.
Implementation Method 1
a non-electrically conductive member including a first portion configured to engage the electrically-conductive tissue-engaging structure and a second portion configured to engage the support base of the jaw member. The non-electrically conductive member adapted to electrically isolate the electrically-conductive tissue-engaging structure from the jaw member.
Implementation Method 2
utilizes a brazing process to join the components, facilitating the formation of a reliable electrosurgical instrument with improved thermal resistance and strength.
Data Source
AI summary
A jaw assembly includes an electrically-conductive tissue-engaging structure, a jaw member including a support base, and a non-electrically conductive member including a first portion configured to engage the electrically-conductive tissue-engaging structure and a second portion configured to engage the support base of the jaw member. The non-electrically conductive member adapted to electrically isolate the electrically-conductive tissue-engaging structure from the jaw member. The electrically-conductive tissue-engaging structure and the non-electrically conductive member cooperatively define a longitudinally-oriented knife channel therethrough.