Electrosurgical Forceps Translating Blade Driver Mechanism
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Solution Overview
Problem
Current electrosurgical instruments lack a mechanism to simultaneously cut and seal tissue efficiently, often requiring separate steps for cutting and coagulation, which can be cumbersome and less effective.
Innovation Solution
An electrosurgical device with an articulating end effector that includes a firing beam and jaws capable of simultaneous tissue cutting and sealing, utilizing bipolar RF energy to weld tissue layers while a translating firing beam severs the tissue, allowing for efficient cutting and hemostatic sealing in a single operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate steps are used for cutting and coagulation, then each function can be performed with dedicated tools, but the procedure becomes cumbersome and less effective
Solution Approach 1:
The patent combines cutting and coagulation functions into a single integrated electrosurgical instrument. The jaw assembly incorporates both a cutting blade for tissue severing and electrodes for RF energy delivery, allowing simultaneous or sequential cutting and coagulation in one device, thereby improving procedural efficiency while maintaining ease of operation
Solution Approach 2:
The electrosurgical instrument is designed as a multi-functional device that can perform cutting, coagulation, and sealing operations. The jaw assembly with integrated blade and electrodes provides universal functionality for different surgical needs, reducing the number of separate tools required and streamlining the surgical workflow
2Productivity
If simultaneous cutting and sealing is implemented, then procedural time is reduced, but the device complexity increases
Solution Approach 1:
The cutting blade and electrodes are integrated into a single jaw assembly structure, merging two functional components into one unified unit. This integration allows simultaneous cutting and sealing operations while managing device complexity through consolidated design rather than separate mechanisms
Solution Approach 2:
The jaw assembly is segmented into distinct functional zones within a single structure - the cutting blade portion and the electrode portions are separated but integrated. This segmentation allows independent optimization of each function while maintaining overall device simplicity through modular integration
3Manufacturing precision
If a translating blade driver is used, then precise cutting control is achieved, but the mechanical complexity of the actuation system increases
Solution Approach 1:
The translating blade driver uses a rack and pinion mechanism where rotational motion of the pinion gear is converted to linear translation of the rack. This mechanical substitution provides precise cutting control through gear engagement while managing actuation complexity through a well-established mechanical principle rather than a novel complex mechanism
Solution Approach 2:
The rack and pinion mechanism acts as an intermediary between the rotational actuation input and the linear blade motion output. This intermediary mechanism translates rotational motion into precise linear displacement, achieving cutting precision while simplifying the overall actuation system through a standard mechanical transmission element
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 precise and efficient cutting and sealing of tissue in a single step, reducing procedural time and minimizing tissue damage, while providing effective hemostasis by applying bipolar RF energy to seal the severed ends.
Implementation Method 1
delivering a bipolar RF current through the tissue to a return electrode, thereby welding the tissue layers to one another
Implementation Method 2
one or more elements that transmit radio frequency (RF) energy to tissue (e.g., to coagulate or seal the tissue)
Data Source
AI summary
An apparatus for operating on tissue comprises a body, a lever, an end effector, and a tissue severing assembly. The end effector has a pair of jaws configured to open and close on tissue. The end effector is also capable of delivering RF energy to the tissue. The lever is configured to drive the pair of jaws. The tissue severing assembly comprises a trigger having at least one elongate member, at least one gear, and a firing beam. The trigger may also comprise a button operable to activate the RF energy. The firing beam is operable to sever tissue captured between the jaws. The at least one elongate member, at least one gear, and firing beam are associated such that longitudinal movement of the trigger in a first direction causes longitudinal movement of the firing beam in a second direction.