Thermally-Activatable Pump Cooling for Surgical Instruments
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Solution Overview
Problem
Portable surgical instruments face the challenge of excessive temperature rise in batteries and generators, which can lead to damage and operational issues due to the lack of effective cooling mechanisms.
Innovation Solution
A thermally-activatable bi-metal pump is integrated with heat sinks and check-valves to promote airflow around the generator and battery assembly, actively cooling them through expansion and contraction in response to temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If portable surgical instruments use battery and generator components, then the instrument achieves portability and operational functionality, but the battery and generator rise in temperature during prolonged use causing potential damage
Solution Approach 1:
The patent utilizes the harmful heat generated by the battery and generator to drive a thermally-activatable pump that circulates coolant through heat sinks. The waste heat that would otherwise cause damage is converted into a useful driving force for the cooling system, eliminating the temperature rise problem while maintaining portability
Solution Approach 2:
The cooling system is designed to activate automatically in response to temperature increases without external control. The thermally-activatable pump self-regulates coolant circulation based on the thermal state of the battery and generator, providing autonomous temperature management that maintains portability without adding complex control mechanisms
2Temperature
If active cooling mechanisms are added to cool the battery and generator, then temperature control improves, but device complexity increases
Solution Approach 1:
The cooling system uses a thermally-activatable pump that automatically responds to temperature changes without requiring external power or control systems. This passive activation mechanism achieves effective temperature control while minimizing added complexity by eliminating the need for motors, sensors, or electronic controls
Solution Approach 2:
The patent employs a thermally-activatable pump that utilizes thermal expansion and contraction of materials to drive coolant circulation. This thermomechanical approach converts temperature changes directly into pumping action, achieving active cooling without complex mechanical or electronic components
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
The solution effectively maintains the generator and battery within safe temperature ranges, reducing the likelihood of overheating and ensuring reliable operation during prolonged use.
Implementation Method 1
A thermally-activatable device in operable communication with either the generator or the battery assembly is configured to expand and contract due to changes in temperature thereof to promote air-flow around the generator and battery assembly such that the generator and battery are actively-cooled during use of thereof
Implementation Method 2
A heat sink may be operably associated with each of the generator and battery assembly. In this instance, expansion and contraction of the thermally-activatable device is caused by the heat sink such that expansion of the thermally-activatable device draws air therein and contraction of the thermally-activatable device expels air therefrom
Data Source
AI summary
A surgical instrument includes a housing having a shaft extending therefrom. An end effector is operably supported at the distal end of the shaft includes a pair of jaw members. A generator operably coupled to the housing is in operable communication with a battery assembly of the surgical instrument to convert electrical energy into at least one of RF and ultrasonic energy to energize the at least one activatable jaw member. A thermally-activatable device in operable communication with either the generator or the battery assembly is configured to promote air-flow around the generator and battery assembly.