Bipolar Forceps Knife Lockout Mechanism for Safe Vessel Sealing
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Solution Overview
Problem
Current bipolar electrosurgical forceps are limited in their ability to safely coagulate arteries larger than 2 to 2.5 mm in diameter, and there is a need for a tool that can both seal and cut tissue effectively during surgical procedures.
Innovation Solution
The development of bipolar forceps with a mechanical design featuring first and second shafts, jaw members, a disposable housing with electrode assemblies, and a knife channel mechanism that allows for selective conduction of electrosurgical energy and tissue cutting, including a knife lockout mechanism to prevent premature cutting when the jaws are not closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bipolar electrosurgical forceps are used to coagulate larger arteries (diameter > 2.5 mm), then the ability to treat larger vessels is improved, but safety deteriorates due to risk of uncontrolled tissue damage and charring
Solution Approach 1:
The knife lockout mechanism performs a preliminary action by preventing knife advancement until the jaw members are properly closed around the vessel. This ensures that cutting only occurs after proper tissue grasping has been established, preventing premature or accidental cutting that could compromise safety when treating larger vessels.
Solution Approach 2:
The knife lockout mechanism provides mechanical feedback by sensing the closed position of the jaw members through engagement with the shaft. This feedback system ensures that the knife can only advance when the correct mechanical condition (jaws closed) is met, providing a safety check that maintains reliability while enabling treatment of larger vessels.
2Adaptability or versatility
If a knife mechanism is added to bipolar forceps for tissue cutting, then cutting capability is improved, but device complexity deteriorates
Solution Approach 1:
The knife mechanism is merged with the existing jaw member structure. The knife channel is formed as part of the electrode assembly, and the knife blade integrates with the mechanical linkage of the forceps. This merging approach adds cutting capability while minimizing additional structural complexity by utilizing existing components.
Solution Approach 2:
The knife blade serves multiple functions: it cuts tissue, seals vessels through the knife channel, and can be advanced or retracted as needed. The same mechanical linkage that operates the jaw members also controls the knife advancement, creating a multi-functional system that reduces overall device complexity.
3Reliability
If a knife lockout mechanism is implemented to prevent premature cutting, then safety is improved, but device complexity deteriorates
Solution Approach 1:
The knife lockout mechanism is self-actuating through mechanical engagement with the shaft. When the jaw members close, the shaft movement automatically engages the lockout mechanism, which then permits knife advancement. The system serves itself by using the natural mechanical motion of the forceps operation to control the safety feature, minimizing the need for additional actuators or control systems.
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
Enables safe coagulation and cutting of larger vessels and effective tissue sealing and cutting, enhancing the precision and safety of surgical procedures by allowing controlled application of electrosurgical energy and precise tissue transection.
Implementation Method 1
Each electrode is adapted to connect to a source of electrosurgical energy to allow selective conduction of electrosurgical energy through tissue
Implementation Method 2
electrical energy can be selectively transferred through the tissue
Implementation Method 3
The knife channel is configured to receive a knife blade therethrough to cut tissue grasped between the jaw members
Data Source
AI summary
A bipolar forceps includes a mechanical forceps including first and second shafts each having a jaw member extending from a distal end thereof and a handle disposed at a proximal end thereof for effecting movement of the jaw members relative to one another about a pivot. A disposable housing is configured to releasably couple to at least one of the shafts and an electrode assembly is configured to releasably couple to the disposable housing. The electrode assembly includes electrodes releasably coupleable to the jaw members. At least one of the electrodes includes a knife channel configured to receive a knife blade therethrough to cut tissue grasped between the jaw members. An actuation mechanism is configured to selectively advance the knife blade through the knife channel to cut tissue.