Surgical Stapler Anvil Lockout for Cartridge Seating Control
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Solution Overview
Problem
Existing surgical stapling instruments lack a mechanism to prevent actuation when a staple cartridge is not properly installed, leading to potential misfires and improper tissue stapling.
Innovation Solution
A surgical stapling instrument with an anvil lock member that retains the anvil in an open position until a staple cartridge is seated, preventing actuation until the cartridge is properly installed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surgical stapling instrument is designed without a lockout mechanism, then the device structure remains simple and easy to operate, but the reliability deteriorates due to potential misfires and improper tissue stapling when no cartridge is installed
Solution Approach 1:
A lockout member is introduced as an intermediary component between the anvil and the closure system. This lockout member includes a lockout portion that engages with the anvil and a release portion that interacts with the closure system, serving as a mediator to prevent actuation when no cartridge is installed while allowing normal operation when a cartridge is properly loaded
Solution Approach 2:
The lockout member is pre-positioned in a state that prevents anvil closure before the cartridge is installed. The lockout portion is initially engaged with the anvil, and only when a cartridge is properly installed does the release portion disengage the lockout portion, allowing the anvil to close. This preliminary locking action ensures safety before any stapling operation can occur
2Reliability
If an anvil lock member is added to prevent actuation without cartridge, then the reliability improves, but the ease of operation worsens due to additional steps for cartridge installation
Solution Approach 1:
The lockout functionality is merged with the cartridge installation mechanism. The release portion of the lockout member is integrated into the closure system, so that the same action required to close the anvil for stapling (activating the closure system) also serves to disengage the lockout portion and allow the anvil to close. This merging eliminates the need for separate steps to disarm the lockout mechanism
3Reliability
If the anvil is kept in open position by default, then the safety is improved, but the productivity deteriorates due to potential delays in stapling operations
Solution Approach 1:
The anvil is pre-positioned in the open position by the lockout member before cartridge installation. This preliminary positioning ensures safety by preventing any stapling operation without a cartridge. Once the cartridge is installed, the release portion quickly disengages the lockout portion, allowing the anvil to close rapidly without significant delay to surgical productivity
Data Source
AI summary
Surgical stapling instruments having surgical stapling cartridges are disclosed. At least one embodiment includes an end effector that has an elongate channel that is configured to operably support a surgical staple cartridge therein and an anvil that is movably supported on the elongate channel between an open position and closed positions in response to an application of opening and closing motions applied thereto. An anvil lock member cooperates with the anvil to retain the anvil in an open position when a staple cartridge has not been installed in the elongate channel and prevent the anvil from moving to a closed position until the staple cartridge has been seated within the elongate channel. Surgical staple cartridges are configured to move the anvil from an open position to an actuatable position when the cartridge has been installed in the end effector.