Surgical Stapling Center Rod Suture Retention
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Solution Overview
Problem
Current surgical stapling devices for circular anastomosis and hemorrhoid treatment face challenges in retaining the purse string suture on the center rod and ensuring secure attachment of the anvil shaft, which can affect the efficacy of tissue manipulation and stapling procedures.
Innovation Solution
A surgical stapling device with an elongated center rod featuring transverse apertures for receiving a flexible member, an anvil retainer connected to a drive screw, and an anvil assembly that moves between un-approximated and approximated positions to enhance the retention of the purse string suture and improve attachment of the anvil shaft, allowing for better tissue handling and stapling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional surgical stapling device is used for circular anastomosis and hemorrhoid treatment, then the basic stapling function is achieved, but the retention of the purse string suture on the center rod is insufficient and the attachment of the anvil shaft is not secure
Solution Approach 1:
The center rod is designed with a hollow cylindrical structure that receives and retains the purse string suture within its lumen. The anvil assembly is nested within the stapling device body, with the anvil shaft extending through the center rod. This nested configuration allows multiple components (center rod, suture, anvil shaft, anvil assembly) to be integrated in a compact arrangement, improving retention and attachment while managing device complexity through spatial efficiency.
Solution Approach 2:
The device is divided into distinct functional segments: the center rod with transverse apertures for suture retention, the anvil assembly with movable anvil head, the drive screw mechanism, and the anvil retainer. Each segment performs a specific function and can be independently designed or adjusted. The center rod segment handles suture retention, while the anvil assembly segment handles tissue stapling, allowing optimization of each component for its specific purpose.
2Ease of operation
If the anvil assembly is designed to move between un-approximated and approximated positions, then tissue manipulation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The anvil assembly is designed as a dynamic component that can move between un-approximated and approximated positions relative to the tissue. The anvil head moves along the anvil shaft, allowing the clinician to adjust the approximation distance to match different tissue thicknesses and surgical requirements. This dynamic adjustment capability improves ease of operation and tissue manipulation effectiveness by adapting to varying surgical conditions.
Solution Approach 2:
The drive screw acts as an intermediary mechanism that translates rotational motion into linear movement of the anvil assembly. By rotating the drive screw, the anvil assembly is moved proximally or distally, providing controlled approximation without requiring direct manual manipulation of the anvil head. This intermediary mechanism simplifies the operation while achieving precise tissue approximation.
3Reliability
If transverse apertures are added to the center rod for receiving the flexible member, then the retention of the purse string suture is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The center rod is designed with specific local features - transverse apertures positioned at predetermined locations along its length. These apertures are strategically placed to receive and retain the purse string suture at critical points. The local quality of the center rod is enhanced at these specific locations while maintaining a simple overall cylindrical structure, balancing manufacturing ease with functional requirements for suture retention.
Data Source
AI summary
A surgical stapling device an elongated body portion having proximal and distal portions, and a head portion positioned adjacent the distal portion of the elongated body portion. The head portion includes a shell assembly and an anvil assembly movable relative to the shell assembly between un-approximated and approximated positions. The anvil assembly includes a center rod and an anvil head connected to the center rod. The center rod includes at least one aperture extending transversely therethrough and configured and dimensioned to receive a flexible member such that the flexible member extends transversely through the center rod.