Surgical Stapler Lockout Features Prevent Inadvertent Firing
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Solution Overview
Problem
Surgical staplers lack effective lockout mechanisms to prevent inadvertent firing when a staple cartridge is not loaded or has been fully used, leading to potential tissue damage without proper stapling.
Innovation Solution
The implementation of lockout features within the end effector, including resilient members and engagement features, that prevent the firing beam and knife member from advancing without a properly loaded staple cartridge and indicate a visual lockout status, ensuring safe and proper stapling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surgical stapler is designed without lockout mechanisms, then the device structure remains simple and easy to manufacture, but the device may inadvertently fire without a properly loaded staple cartridge, causing tissue damage
Solution Approach 1:
The lockout feature is engaged in advance by the presence of a properly loaded staple cartridge, preventing the firing beam from advancing before the cartridge is correctly installed. This preliminary action ensures that the cutting member cannot sever tissue without staples being ready to seal the incision.
Solution Approach 2:
The resilient lockout feature acts as an intermediary mechanical element between the staple cartridge and the firing beam. When the cartridge is properly loaded, the lockout feature engages with the cartridge to permit firing; when the cartridge is absent or depleted, the lockout feature physically blocks the firing beam, preventing inadvertent activation.
2Productivity
If the firing beam can advance freely without restrictions, then the surgical stapler operates quickly and efficiently, but tissue may be severed without being stapled, compromising patient safety
Solution Approach 1:
The lockout mechanism applies a preliminary counteracting force to the firing beam when the staple cartridge is not properly loaded. This anti-action prevents the beam from moving forward, ensuring that tissue cannot be cut without the protective stapling function being activated simultaneously.
Solution Approach 2:
The surgical stapler system serves itself through the interlocked mechanism where the staple cartridge automatically engages the lockout feature. When the cartridge is properly installed with staples available, the system self-permits firing; when the cartridge is empty or missing, the system self-blocks firing, eliminating the need for external monitoring.
3Ease of operation
If there are no engagement features to verify cartridge loading, then the device is easier to operate and load, but the clinician cannot determine whether a staple cartridge is properly loaded, leading to potential surgical errors
Solution Approach 1:
The lockout feature provides a visual indication through its engaged or disengaged state, allowing the clinician to immediately determine whether a staple cartridge is properly loaded. The mechanical position of the lockout feature serves as a clear visual cue without requiring complex electronic displays or additional verification steps.
Solution Approach 2:
The engagement features between the staple cartridge and lockout mechanism automatically provide verification of proper loading. The mechanical interaction itself generates the indication, eliminating the need for separate detection systems or manual verification procedures by the clinician.
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
Prevents inadvertent firing, ensuring that tissue is not severed without being stapled, enhancing the safety and efficacy of the surgical stapling process by ensuring a staple cartridge is loaded and preventing reuse of a spent cartridge.
Implementation Method 1
resilient members and engagement features, that prevent the firing beam and knife member from advancing
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.