Bipolar Forceps Pressure Feedback for Uniform Vessel Sealing
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Solution Overview
Problem
Existing bipolar electrosurgical forceps struggle to provide uniformly reproducible pressure and consistent sealing of larger blood vessels, often resulting in ineffective or non-uniform seals due to issues with controlling clamping pressure and electrode gap distances.
Innovation Solution
A bipolar electrosurgical instrument with jaw members that include a switch mechanism to provide tactile feedback on grasping pressure and activate electrosurgical energy, ensuring consistent closure pressure and controlled electrode gap, facilitated by a knife channel for precise tissue cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bipolar electrosurgical forceps are used to seal larger blood vessels, then vessel sealing capability is improved, but uniformity and reliability of the seal deteriorate due to difficulty in controlling clamping pressure and electrode gap distances
Solution Approach 1:
The patent applies parameter changes by implementing a movable electrode that can adjust its position relative to the opposing electrode, thereby dynamically controlling the electrode gap distance. This allows the system to maintain optimal sealing parameters for vessels of varying sizes, improving both adaptability and seal uniformity simultaneously
Solution Approach 2:
The patent implements dynamics by making one electrode movable rather than fixed, allowing real-time adjustment of the electrode gap during the sealing process. This dynamic adjustment capability enables consistent pressure and gap control across different vessel diameters, resolving the contradiction between versatility and reliability
2Reliability
If electrosurgical energy is applied to seal tissue, then hemostasis and vessel sealing are achieved, but inconsistent pressure application results in non-uniform seals
Solution Approach 1:
The patent applies feedback through a switch mechanism that provides tactile response to the operator, indicating when optimal grasping pressure has been achieved. This feedback loop ensures consistent pressure application before electrosurgical energy is delivered, resulting in uniform and reliable seals
3Manufacturing precision
If a switch mechanism is added to provide tactile feedback on grasping pressure, then seal consistency is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing a switch mechanism that automatically detects when optimal pressure is applied through tactile feedback, eliminating the need for complex electronic sensors or additional control systems. The mechanism serves itself by providing intuitive operator guidance through mechanical feedback alone
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
Ensures uniform and effective sealing of tissue by providing tactile responses for optimal grasping pressure and energy application, enhancing the reliability of vessel sealing.
Implementation Method 1
Electrosurgical forceps utilize both mechanical clamping action and electrical energy to effect hemostasis by heating the tissue and blood vessels to coagulate, cauterize and/or seal tissue
Implementation Method 2
Bipolar electrosurgical forceps utilize two generally opposing electrodes which are disposed on the inner opposing surfaces of the end effectors and which are both electrically coupled to an electrosurgical generator. Each electrode is charged to a different electric potential. Since tissue is a conductor of electrical energy, when the effectors are utilized to grasp tissue therebetween, the electrical energy can be selectively transferred through the tissue
Data Source
AI summary
A bipolar electrosurgical instrument includes first and second shafts each having a jaw member extending from its distal end. Each jaw member is adapted to connect to a source of electrosurgical energy such that the jaw members are capable of selectively conducting energy through tissue held therebetween. A knife channel is configured to reciprocate a cutting mechanism therealong. An actuator selectively advances the cutting mechanism. A switch is disposed on the first shaft and is configured to be depressed between a first position and at least one subsequent position upon biasing engagement with a mechanical interface disposed on the second shaft. The first position of the switch relays information to the user corresponding to a desired pressure on tissue and the at least one subsequent position is configured to activate the source of electrosurgical energy to supply electrosurgical energy to the jaw members.