Electrosurgical Forceps Knife Lockout for Controlled Jaw-Closed Cutting
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Solution Overview
Problem
Existing electrosurgical forceps lack a mechanism to prevent the deployment of the knife before the jaws are sufficiently closed, leading to potential tissue damage or incomplete tissue treatment.
Innovation Solution
The electrosurgical forceps incorporate a knife lockout mechanism that prevents the deployment of the knife until the jaw members are in a sufficiently closed position, ensuring precise tissue treatment and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a knife deployment mechanism is added to electrosurgical forceps to enable tissue severing, then the functionality of the instrument is improved, but the risk of premature knife deployment before proper tissue grasping and treatment increases
Solution Approach 1:
The knife lockout mechanism performs a preliminary action by preventing knife deployment until the jaw members are properly closed. The lockout mechanism includes a lockout member that must be actuated after jaw closure, ensuring that tissue grasping and electrosurgical treatment are completed before the knife can be deployed. This preliminary safety check prevents premature knife deployment and ensures proper surgical sequence.
2Reliability
If a lockout mechanism is added to prevent premature knife deployment, then surgical safety is improved, but the device complexity increases
Solution Approach 1:
The lockout mechanism is merged with the existing knife deployment mechanism by integrating the lockout member into the same actuation system. The lockout member shares the deployment trigger and linkage with the knife, combining the safety function with the existing deployment structure. This integration adds safety functionality while minimizing the increase in overall device complexity.
Solution Approach 2:
The lockout member acts as an intermediary between the jaw closure action and the knife deployment. It mediates the sequence by requiring jaw closure to occur first, then allowing knife deployment only after the lockout is released. This intermediary component provides a simple mechanical safeguard without requiring complex electronic controls or multiple independent systems.
3Measurement precision
If the knife deployment is restricted until jaw closure, then tissue treatment precision is improved, but the operation time increases due to additional safety checks
Solution Approach 1:
The lockout mechanism is designed to be automatically released when the jaw members are closed, eliminating the need for separate manual safety checks. The mechanical linkage self-actuates the lockout release based on jaw position, providing automatic safety verification that does not require additional surgeon actions or time-consuming manual checks.
Solution Approach 2:
The lockout mechanism performs preliminary safety verification through automatic jaw position sensing. By requiring jaw closure before knife deployment, the system ensures proper tissue grasping and positioning occur first. This preliminary action prevents incorrect knife deployment while the automatic mechanical release minimizes the time added to the surgical procedure.
Data Source
AI summary
An electrosurgical forceps includes first and second shafts configured to rotate about a pivot to move jaw members between an open position and a closed position. A knife deployment mechanism is operably coupled to a knife and is configured to move the knife between a retracted position and an extended position. A knife lockout is configured to move between a first position wherein the jaw members are in the open position and movement of the knife from the retracted position to the extended position is prevented, a second position wherein the jaw members are in the closed position and movement of the knife from the retracted position to the extended position is permitted, and a third position wherein the jaw members are in the closed position and movement of the knife from the retracted position to the extended position is prevented.