Sliding Sleeve for Circular Stapler Anvil Head Tilt
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Solution Overview
Problem
In circular stapling procedures, the anastomosis donut can become pinched by the anvil head when it is tilted, leading to unwanted tissue damage and increased retraction forces during removal, as the anvil head may contact the anastomosis ring edge.
Innovation Solution
A surgical stapling device with a tilt-able anvil head and a sliding sleeve mechanism that secures the anastomosis donut within the cartridge assembly, allowing the anvil head to tilt freely without pinching, utilizing a locking sleeve to retain the sliding sleeve and prevent interference between the anvil head and the donut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the anvil head is tilted to maximum angle to facilitate withdrawal through the anastomosis ring, then the ease of operation is improved, but the anastomosis donut becomes pinched and tissue damage occurs
Solution Approach 1:
A sliding sleeve is introduced as an intermediary component between the anvil head and the anastomosis donut. The sleeve receives and retains the donut, preventing direct contact between the tilting anvil head and the donut, thereby eliminating the pinching effect while allowing full tilting range for easy withdrawal
2Ease of operation
If the anvil head is tilted to maximum angle for easy withdrawal, then the ease of operation is improved, but retraction forces increase due to contact with anastomosis ring edge
Solution Approach 1:
The sliding sleeve acts as a mediator that prevents the anvil head from contacting the anastomosis ring edge during tilting. By retaining the donut and creating a clearance, the sleeve eliminates the source of high retraction forces while allowing the anvil head to achieve maximum tilt angle for smooth withdrawal
3Object-affected harmful factors
If the sliding sleeve is added to retain the anastomosis donut and prevent interference, then tissue damage is reduced, but the device complexity increases
Solution Approach 1:
The anvil assembly is segmented into distinct functional components: the anvil head for stapling, the sliding sleeve for donut retention and interference prevention, and the locking mechanism for securing the sleeve. This segmentation allows each component to perform its specific function independently, resolving the technical contradiction by adding only the necessary elements
4Reliability
If the locking mechanism is engaged to secure the sliding sleeve, then the sleeve is retained properly, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-actuating through the natural tilting motion of the anvil head. As the anvil head tilts, it automatically engages the locking member with the protrusion on the sliding sleeve, securing the sleeve without requiring additional actuators or complex control systems
Data Source
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AI summary
A surgical stapling device and method for joining tissue portions are provided including a handle assembly, an elongate body extending from the handle assembly, a cartridge assembly supported on a distal end of the elongate body, and an anvil assembly at a distal end of the surgical stapling device. The anvil assembly includes a shaft for removably coupling the anvil assembly to the cartridge assembly and a head pivotally mounted to a distal end of the shaft. A sleeve member is slidably disposed about the shaft of the anvil assembly and is transitionable between a first position, where the sleeve member engages the head of the anvil assembly to secure the head in an un-tilted condition, and a second position, where the sleeve member is disengaged from the head of the anvil assembly to allow the head to tilt.