Surgical Stapler Lockout Mechanism for Empty Cartridge Detection
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Solution Overview
Problem
Current surgical staplers lack effective lockout mechanisms to prevent inadvertent firing when a staple cartridge is empty or has been previously fired, leading to potential tissue damage and inefficiencies in surgical procedures.
Innovation Solution
The implementation of lockout features within the end effector, such as resilient members and engagement features, that prevent the firing beam and knife member from advancing without a properly loaded staple cartridge and indicate when the cartridge is spent, ensuring safe and controlled stapling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no lockout mechanism is provided, then the device structure remains simple, but inadvertent firing may occur when the cartridge is empty or previously fired, causing tissue damage
Solution Approach 1:
The lockout feature is activated in advance by the state of the staple cartridge (empty or previously fired) to prevent firing before it is needed. The resilient member is pre-positioned to block the firing beam, and only releases when proper conditions are met (cartridge loaded and anvil closed), thus preventing inadvertent firing proactively.
Solution Approach 2:
The resilient member acts as an intermediary element between the firing beam and the trigger mechanism. It physically intervenes to block the firing beam's path when the cartridge is empty or spent, serving as a mechanical mediator that translates cartridge state into firing prevention without requiring complex electronic sensors or control systems.
2Object-affected harmful factors
If lockout features are added to prevent inadvertent firing, then safety is improved, but the device complexity increases
Solution Approach 1:
The lockout mechanism is self-regulating and automatically responds to the state of the staple cartridge and anvil position. The resilient member self-activates to block firing when the cartridge is empty or spent, and self-releases when properly loaded, without requiring external control systems, sensors, or power sources, thus minimizing added complexity while ensuring safety.
Solution Approach 2:
The lockout function is extracted as a separate, dedicated feature (the resilient member) rather than being integrated into the existing firing mechanism. This modular approach allows the safety function to be added independently with minimal impact on the rest of the device structure, making the complexity localized and manageable.
3Ease of operation
If the firing beam can advance freely, then the operation is simple and quick, but firing may occur without a properly loaded cartridge leading to surgical errors
Solution Approach 1:
The resilient member applies preliminary counter-action by blocking the firing beam's path before firing can occur. It proactively prevents the harmful action (firing without loaded cartridge) by positioning itself in the beam's path when conditions are not met, requiring the operator to first ensure proper cartridge loading and anvil closure before the blockage is removed.
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 lockout features ensure that the surgical stapler can only fire when a loaded staple cartridge is present, preventing tissue damage and allowing for efficient and controlled stapling, thereby enhancing surgical precision and safety.
Implementation Method 1
a resilient member configured to engage a notched surface of the cartridge body
Data Source
AI summary
A surgical instrument comprises a body, shaft, and end effector. The shaft couples the end effector and body together. The end effector comprises an anvil and lower jaw configured to receive a surgical staple cartridge. The anvil is configured to pivot toward and away from the staple cartridge and lower jaw. The shaft assembly comprises a knife member configured to longitudinally translate to thereby substantially simultaneously cut clamped tissue and staple the severed tissue. The end effector may comprise lockout features configure to prevent longitudinal translation of the knife member. The end effector or staple cartridge may comprise lockout bypass features configured to prevent lockout of the knife member. These lockout bypass features may operate to permit longitudinal translation of the knife member once or multiple times. The end effector may comprise features configured to ensure proper alignment of the anvil relative to the staple cartridge.