Nested Ring Anastomosis Device Compression
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Solution Overview
Problem
Conventional surgical staplers used in anastomosis procedures do not provide sufficient compression on bowel segments, leading to complications such as leakage and infections, and do not facilitate a smooth healing process.
Innovation Solution
A kit of parts comprising an inner ring and an outer ring, arranged to form an annular space that converges axially, allowing for controlled compression of gastro-intestinal tract sections, which results in the submucosal layers being brought into contact for improved healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surgical staplers are used for anastomosis, then the procedure is standard and reliable, but no compression is applied to the bowel segments and blood circulation between staples is preserved, resulting in insufficient compression and higher complication rates
Solution Approach 1:
The device employs nested rings (inner ring within outer ring) that telescope into each other to create progressive compression. The inner ring is inserted through the anastomosis site and nested within the outer ring, allowing controlled compression forces to be applied to the bowel segments while maintaining structural integrity and preventing leakage
Solution Approach 2:
The device changes the physical parameter of compression force by using springs that expand to push the rings apart, creating controlled pressure on the bowel segments. This mechanical parameter change ensures adequate compression to promote healing while preserving blood circulation, directly addressing the insufficiency of conventional staplers
2Reliability
If compression anastomosis is performed to improve healing, then favourable results are obtained, but the procedure becomes more complex and less accessible compared to conventional staplers
Solution Approach 1:
The device is segmented into distinct functional components: outer ring, inner ring, springs, and connecting elements. This segmentation allows each component to perform its specific function (compression, structural support, force application) while maintaining overall simplicity and ease of assembly during the surgical procedure
Solution Approach 2:
The device incorporates dynamic elements including expandable springs and telescoping rings that can adjust during the procedure. The springs automatically expand to provide controlled compression forces, and the rings can telescope to accommodate different bowel diameters, making the device adaptable without requiring complex adjustment mechanisms
3Manufacturing precision
If the annular space between rings is reduced to compress tissue, then submucosal layers are brought into contact for primary intent healing, but the device must be precisely engineered to achieve the correct compression force
Solution Approach 1:
The device uses spring mechanics to transform small dimensional changes into controlled compression forces. The spring constant and initial compression distance are designed to produce the optimal force for bringing submucosal layers into contact, achieving precise tissue compression through well-established mechanical principles rather than requiring ultra-precise manufacturing tolerances
Solution Approach 2:
The force application is segmented through multiple springs distributed around the ring structure, allowing the compression force to be distributed evenly around the anastomosis site. This segmentation makes the device more robust to manufacturing variations in individual components while maintaining overall compression precision
Data Source
AI summary
A kit of parts is provided for forming a device for performing anastomosis a first gastro-intestinal tract. The kit of parts comprises an inner ring, comprising an outer surface generally facing away from the passage, and an outer ring, comprising an inner surface. When the inner ring and the outer ring are in an assembled state, the inner ring is at least partially positioned in the reception volume of the outer ring, at least part of the outer surface of the inner ring faces towards the inner surface of the outer ring, and the outer surface and the inner surface together define an annular space between them, wherein at least part of the annular space converges in the generally axial direction.