Motor Cooling Assembly for Tissue Resecting Devices
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Solution Overview
Problem
Existing tissue resection devices require extensive sterilization due to the use of fluids for cooling and distending during endoscopic procedures, which can be cumbersome and time-consuming.
Innovation Solution
A tissue resecting device with a cooling assembly that includes a housing, fan assembly, and fin pack, which facilitates cooling of the motor through air flow, reducing the need for extensive sterilization by effectively managing heat and debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fluid is used for cooling the motor during endoscopic tissue resection, then cooling effectiveness is improved, but sterilization complexity increases
Solution Approach 1:
The patent extracts the fluid cooling function from the system by replacing it with an air cooling mechanism. The motor is cooled by air flow generated by a fan assembly that moves air through passages in the motor housing, eliminating the need for fluid circulation and associated sterilization requirements while maintaining effective heat dissipation from the motor
Solution Approach 2:
The patent uses pneumatic cooling by introducing air flow through the motor housing passages. A fan assembly creates controlled air flow that passes through channels in the motor housing, using convective heat transfer to cool the motor without requiring liquid fluids, thereby simplifying sterilization procedures
2Ease of operation
If air cooling is implemented instead of fluid cooling, then sterilization burden is reduced, but cooling efficiency may be compromised
Solution Approach 1:
The motor housing is segmented into multiple cooling passages that distribute air flow throughout the motor structure. This segmentation increases the surface area for heat transfer and ensures efficient cooling of different motor components, maintaining cooling effectiveness while using simpler air instead of fluid
Solution Approach 2:
The patent introduces a fan assembly as an intermediary device to generate and direct air flow through the motor housing passages. This intermediary mechanism ensures sufficient air velocity and distribution to maintain effective heat transfer, compensating for the lower heat capacity of air compared to liquid coolants
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 cooling assembly efficiently manages heat and debris, enhancing the device's operational efficiency and reducing the sterilization burden, thereby improving the usability and effectiveness of the tissue resection process.
Implementation Method 1
Actuation of the motor rotates the cutting member and the plurality of blades of the fan assembly to thereby advance air through a space between the fin pack and the elongate cover of the housing to facilitate cooing of the motor
Implementation Method 2
The fin pack includes a tubular base and a plurality of fins extending radially outward from the tubular base
Data Source
AI summary
A tissue resecting device includes a handpiece assembly and an end effector assembly. The handpiece assembly includes a motor and a cooling assembly. The cooling assembly includes a housing, a fan assembly, and a fin pack. The fan assembly includes a tubular member configured to be received in the elongate cover, and a plurality of blades rotatably supported on the tubular member and operatively coupled with a drive rotor of the motor for concomitant rotation therewith. The fin pack includes a tubular base and a plurality of fins extending radially outward from the tubular base. The tubular base is disposed within the elongate cover and about the tubular member of the fan assembly. Actuation of the motor rotates the plurality of blades of the fan assembly to thereby advance air through a space between the fin pack and the elongate cover of the housing to facilitate cooling of the motor.