Surgical Stapling Instrument with Differential Staple Drive
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Solution Overview
Problem
Existing surgical stapling and cutting instruments face challenges in efficiently and reliably stapling and cutting tissue, particularly in ensuring precise control over stapling and cutting operations, and in preventing misfires or incomplete stapling/cutting actions.
Innovation Solution
The development of a surgical stapling instrument with an interchangeable surgical tool assembly that includes a shifting assembly to selectively drive either the closure drive or the firing drive, along with a bailout system and a shifter solenoid mechanism to ensure precise control over stapling and cutting operations, and prevent misfires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surgical stapling instrument uses a fixed drive mechanism, then the structure is simple, but it cannot selectively drive different drives (closure drive or firing drive) causing inability to prevent misfires or incomplete actions
Solution Approach 1:
The patent implements a dynamic shifting mechanism that allows the drive system to transition between different operational modes (closure drive and firing drive). The shifter assembly with solenoid enables selective engagement of different drive shafts based on the required surgical action, providing adaptability while maintaining reliable operation through controlled mode switching.
Solution Approach 2:
The shifter assembly acts as an intermediary mechanism between the control system and the drive system. It includes a shifter solenoid that mediates the selection between closure drive and firing drive, ensuring that only the appropriate drive is activated based on the surgical procedure requirements, thereby preventing misfires.
2Reliability
If the instrument lacks a bailout system, then the device is simpler, but it cannot prevent unintended activation or provide safety controls
Solution Approach 1:
The bailout system implements preliminary protective measures by providing a mechanical interlock that prevents unintended activation of the firing drive. The system includes a bailout arm and spring mechanism that counteracts erroneous inputs or unintended actions before they can cause harm, ensuring safety through pre-established protective constraints.
3Adaptability or versatility
If the instrument uses a single drive shaft, then the mechanism is simpler, but it cannot provide both closure and firing functions selectively
Solution Approach 1:
The patent creates a multi-functional drive system where a single motor can selectively drive either the closure drive shaft or the firing drive shaft through the shifter assembly. This universal approach allows one motor to perform multiple functions (closure and firing operations) by dynamically routing power to the appropriate drive shaft, avoiding the need for separate motors while maintaining versatility.
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 instrument provides enhanced precision and reliability in stapling and cutting tissue, ensuring complete stapling and cutting actions, and includes safety features to prevent unintended instrument activation.
Implementation Method 1
a shifter solenoid mechanism to ensure precise control over stapling and cutting operations
Data Source
AI summary
A surgical stapling assembly comprising a staple driver assembly is disclosed. The staple driver assembly comprises a first staple support driver supporting a first staple, a second staple support driver supporting a second staple, a first driver portion supporting the first staple support driver, and a second driver portion supporting the second staple support driver. The first staple support driver is movable within a first staple cavity. The second staple support driver is movable within a second staple cavity. The staple driver assembly further comprises a main driver to concurrently drive the first driver portion and the second driver portion during a firing stroke, wherein the first driver portion is configured to drive the first staple a first distance, wherein the second driver portion is configured to drive the second staple a second distance, and wherein the first distance is different from the second distance.