Surgical Handle Assembly Mode Switching Mechanism
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Solution Overview
Problem
Surgical staplers lack a reliable mechanism for easily switching between forward and reverse modes of operation, which is essential for deploying and reloading staples efficiently.
Innovation Solution
A surgical handle assembly with a toothed rack, a tab, and a trigger gear that allows for mode selection via a button and/or tab, enabling the rack to be advanced or reversed linearly depending on the mode of operation, facilitating staple deployment and reloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a surgical stapler uses a simple linear rack mechanism for staple deployment, then the structure is simple, but it cannot easily switch between forward and reverse modes of operation
Solution Approach 1:
The patent applies the dynamics principle by making the rack mechanism reversible and adaptable through mode selection. The rack can dynamically switch between forward motion (for staple deployment) and reverse motion (for cartridge reloading) based on the selected mode, transforming a static linear mechanism into a dynamic bidirectional system that resolves the contradiction between simplicity and versatility
Solution Approach 2:
The patent implements universality by designing the rack mechanism to perform multiple functions: forward motion for staple deployment and reverse motion for cartridge reloading. This multi-functional design allows a single mechanism to handle both staple firing and reloading operations, eliminating the need for separate mechanisms and maintaining structural simplicity while achieving mode switching capability
2Reliability
If a surgical stapler implements a reliable mode switching mechanism, then the reliability of operation mode control improves, but the device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a mode selection mechanism (such as a button or tab) that acts as a mediator between the user and the rack system. This intermediary component controls the engagement of the rack with different drive mechanisms (forward drive vs. reverse drive), providing reliable mode switching through a simple interface that does not significantly increase overall device complexity
Solution Approach 2:
The patent applies segmentation by dividing the control mechanism into distinct functional segments: a mode selection interface (button/tab), a transmission path for forward motion, and a transmission path for reverse motion. This segmented architecture allows each component to perform its specific function reliably while keeping the overall system manageable and not excessively complex
3Productivity
If the rack is designed to move only in one direction, then the mechanism is simple, but it cannot support both staple deployment and reloading operations efficiently
Solution Approach 1:
The patent transforms the static unidirectional rack into a dynamic bidirectional rack that can move in both forward and reverse directions based on operational needs. This dynamic capability allows the same rack mechanism to efficiently handle both staple deployment (forward motion) and cartridge reloading (reverse motion), improving productivity without requiring separate mechanisms for each function
Solution Approach 2:
The patent implements universality by designing the rack as a multi-functional component that serves dual purposes: advancing staples during deployment and retracting during reloading operations. This single bidirectional rack replaces what would otherwise require separate unidirectional mechanisms, maintaining mechanical simplicity while enabling efficient performance of both staple firing and reloading tasks
Data Source
AI summary
The present disclosure includes apparatuses for a surgical handle assembly. An example apparatus includes a toothed rack, a tab configured to provide a reverse mode of operation for the toothed rack by engaging a reverse gear, and a trigger gear connected to the reverse gear and to a movable handle member configured to reverse the toothed rack linearly in a proximal direction in response to actuation of the movable handle member.