Electrosurgical Forceps Knife Lockout for Precise Tissue Severing
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Solution Overview
Problem
Existing electrosurgical forceps require manual severing of treated tissue after coagulation or sealing, which can be inefficient and may lead to inaccuracies.
Innovation Solution
An electrosurgical forceps design incorporating a knife deployment mechanism with a knife lockout feature that allows controlled translation of the knife between retracted and extended positions, ensuring precise tissue severing only when jaw members are fully approximated, along with a switch assembly for electrosurgical energy supply and a knife configured with etched surfaces for enhanced cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a knife is incorporated into electrosurgical forceps for automated tissue severing, then productivity and precision are improved, but device complexity increases
Solution Approach 1:
The knife is integrated into the forceps assembly, combining the grasping function and cutting function into a single device. The knife is positioned within the jaw members and deployed through a linkage mechanism that utilizes the existing pivot structure, merging multiple functions (grasping, sealing, and cutting) into one instrument to improve productivity without proportionally increasing complexity
Solution Approach 2:
The knife is pre-positioned within the jaw members in a retracted state before use. The deployment mechanism is pre-configured with the linkage and trigger system, allowing the knife to be rapidly deployed when needed. This preliminary preparation enables quick transition from grasping to cutting without requiring separate setup steps
2Reliability
If a knife lockout mechanism is added to ensure safe knife deployment only when jaw members are approximated, then reliability is improved, but device complexity increases
Solution Approach 1:
The lockout mechanism prevents knife deployment before the jaw members are properly approximated. A cam surface or blocking feature in the linkage system creates a mechanical interlock that only releases when the jaw members reach the correct position, thereby preventing premature or unsafe knife deployment
Solution Approach 2:
The linkage mechanism provides mechanical feedback between the jaw member position and the knife deployment status. The system monitors the approximation of jaw members through the mechanical connection, and only permits knife deployment when the feedback indicates proper jaw closure, ensuring safe operation
3Device complexity
If manual severing of treated tissue is performed, then device complexity is reduced, but productivity and precision deteriorate
Solution Approach 1:
The forceps integrates both the grasping/sealing function and the cutting function into a single device. The knife is positioned within the jaw members, allowing the surgeon to perform both electrosurgical sealing and mechanical cutting with one instrument, eliminating the need for separate scissors or clamps and thereby improving productivity
Data Source
AI summary
A knife configured for use with an electrosurgical forceps having curved jaw members and a method of manufacturing the same. The knife includes a distal body having an inner side and an outer side, a first etching on the outer side of the distal body defining a distal cutting edge and a second etching on the outer side of the distal body extending along a portion of a length of the distal body to define relatively protruded and relatively recessed surfaces extending along a portion of the length of the distal body on the outer side thereof.