Surgical Stapler Bailout Assembly for Gap Control
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Solution Overview
Problem
Current surgical stapling instruments face challenges in ensuring a secure and leak-proof end-to-end anastomosis between anatomical lumens, particularly in maintaining the appropriate gap distance between the anvil and stapling head to prevent leakage or tissue damage during the anastomosis process.
Innovation Solution
The development of a circular stapling instrument with a handle assembly that includes a rotatable knob and trigger mechanism, allowing for precise adjustment and locking of the gap distance between the anvil and stapling head, coupled with a motor-driven stapling head assembly that drives staples through the tissue to secure the anastomosis, while incorporating bailout features for quick release of compression during procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap distance between the anvil and stapling head is not precisely controlled, then the operation is simpler, but the anastomosis may leak or cause tissue damage
Solution Approach 1:
The anvil is pre-configured with a specific gap distance relative to the stapling head, allowing the surgeon to set the correct spacing before the procedure begins. This preliminary setup ensures proper tissue compression and staple formation without requiring complex real-time adjustments during the anastomosis procedure.
Solution Approach 2:
A bailout assembly acts as an intermediary mechanism between the surgeon's control and the anvil position. This assembly includes a release member that can quickly adjust or release the anvil's compression force, providing a safety mechanism to prevent tissue damage while maintaining precise gap control during normal operation.
2Reliability
If compression force is applied to secure the anastomosis, then the seal is stronger, but tissue damage or necrosis may occur
Solution Approach 1:
The compression force applied by the anvil is dynamically controlled through the bailout assembly, allowing the surgeon to adjust the force level during the procedure. The anvil can be positioned to apply sufficient compression for secure stapling, then released or repositioned if excessive force is detected, preventing tissue necrosis while maintaining seal integrity.
Solution Approach 2:
The bailout assembly provides a feedback mechanism where the surgeon can monitor tissue response to compression and quickly release or adjust the anvil position. This immediate feedback capability allows the surgeon to optimize compression force in real-time, ensuring strong sealing without causing tissue damage.
3Ease of operation
If the anvil is quickly released during procedure, then tissue compression can be managed, but the device requires additional bailout mechanisms
Solution Approach 1:
The bailout assembly is designed as a separate, extractable component that can be independently operated from the main stapling device. This modular approach allows the quick-release function to be added without fundamentally redesigning the entire anvil mechanism, providing ease of operation while minimizing overall device complexity.
Data Source
AI summary
A surgical instrument includes an anvil, a staple applying assembly, an adjustment member, a user input feature, and a bailout assembly. The staple applying assembly includes a distal surface defining openings and a driver that is operable to drive an annular array of staples through the openings of the distal surface and into tissue. The adjustment member is operable to adjust the position of the anvil to thereby vary a gap distance defined between the anvil and the distal surface. The adjustment member includes a first section and a second section. The user input feature is operable to actuate the driver to thereby drive the staples. The bailout assembly is operable to selectively separate the first section of the adjustment member from the second section of the adjustment member.