Electrosurgical Instrument Heat Pipe for Thermal Spread Control
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Solution Overview
Problem
Existing electrosurgical instruments face challenges in managing thermal spread and minimizing harm from accidental contact due to inadequate heat management during tissue treatment.
Innovation Solution
Incorporation of a heat pipe within the electrosurgical instrument to draw heat proximally away from the end effector assembly, utilizing a cooling fluid and high thermal conductivity materials to facilitate cooling and minimize thermal spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrosurgical energy is applied to treat tissue, then tissue treatment effectiveness is improved, but thermal spread increases causing harm from accidental contact
Solution Approach 1:
A heat pipe is introduced as an intermediary thermal management component between the jaw members and the surrounding environment. The heat pipe conducts excess heat away from the jaw members through its high thermal conductivity, preventing thermal spread to adjacent tissues while maintaining effective treatment temperatures at the tissue-contacting surfaces.
Solution Approach 2:
The patent replaces passive mechanical cooling systems with an active thermal conduction system using a heat pipe. The heat pipe utilizes phase change and capillary action mechanisms to actively transport heat away from the jaw members, providing more effective thermal management compared to traditional mechanical cooling approaches.
2Power
If jaw members are heated to treat tissue, then coagulation and sealing effectiveness is improved, but accidental contact harm increases
Solution Approach 1:
The heat pipe serves as a thermal intermediary that decouples the relationship between jaw member heating and thermal spread. It allows the jaw members to maintain high temperatures for effective coagulation and sealing while simultaneously conducting excess heat away, reducing the harmful effects of accidental contact with heated surfaces.
Solution Approach 2:
The patent converts the harmful thermal energy that would otherwise cause accidental contact harm into a beneficial cooling mechanism. The heat pipe captures excess heat from the jaw members and redirects it away from the treatment area, transforming potential harm into an active thermal management benefit that protects surrounding tissues.
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
Effectively cools the end effector assembly, reducing thermal spread and minimizing harm from accidental contact during and after tissue treatment.
Implementation Method 1
The heat pipe is configured to facilitate drawing heat proximally from the first and second jaw members
Implementation Method 2
The heat pipe includes a cooling fluid disposed therein
Data Source
AI summary
An electrosurgical instrument includes at least one shaft member, an end effector assembly extending distally from the at least one shaft member, and a heat pipe. The end effector assembly includes first and second jaw members, each including an electrically-conductive tissue-contacting surface. At least one of the first or second jaw members is movable relative to the other about a pivot between a spaced-apart position and an approximated position for grasping tissue between the electrically-conductive tissue-contacting surfaces. The heat pipe includes a proximal body portion and a flattened distal portion. The proximal body portion extends through at least a portion of the at least one shaft member, and the flattened distal portion extends through at least a portion of the first jaw member. The heat pipe is configured to facilitate drawing heat proximally from the end effector assembly.