Mucosectomy Stapler with Annular Grooves for Controlled Tissue Retraction
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Solution Overview
Problem
Existing mucosectomy staplers lack the ability to remove mucosal tissue in a homogeneous and controlled manner due to manual pulling of suture threads, leading to inefficiencies in the procedure.
Innovation Solution
A stapler with a central rod featuring annular grooves on its lateral surface to securely hold tissue in place during retraction, allowing for precise and controlled removal of varying mucosa volumes by selecting the appropriate groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual pulling of suture threads is used to close the stapler, then the stapler can be operated, but the mucosa cannot be removed in a homogeneous and controlled way
Solution Approach 1:
The central rod with annular grooves enables self-alignment and self-control of tissue retraction. As the rod is retracted, the purse-string suture automatically engages the grooves at precise intervals, eliminating the need for manual thread pulling while ensuring homogeneous mucosa removal. The groove geometry itself controls the retraction process.
Solution Approach 2:
The annular grooves are positioned at specific intervals along the central rod, creating discrete retraction positions. By changing the rod retraction distance to match groove positions, the system achieves controlled mucosa removal in standardized volumes, transforming continuous manual pulling into discrete, precise steps.
2Reliability
If the central rod is retracted to close the stapler, then the stapler function is achieved, but the tissue may slide along the rod uncontrollably
Solution Approach 1:
The central rod features localized annular grooves at specific positions rather than a uniform surface. These grooves create localized engagement points that prevent tissue sliding at critical positions while maintaining rod simplicity elsewhere. The grooves are strategically placed to match the desired retraction stops.
Solution Approach 2:
The annular grooves act as intermediary structures between the central rod and the purse-string suture. They provide mechanical engagement points that translate rod retraction into controlled tissue capture, mediating the interaction between the rod and suture to prevent uncontrolled sliding.
3Adaptability or versatility
If a fixed mucosa removal volume is used, then the procedure is simplified, but the stapler cannot adapt to different surgical needs
Solution Approach 1:
The central rod is segmented with multiple annular grooves at different positions along its length. Each groove represents a discrete mucosa removal volume option. The surgeon selects the appropriate groove based on surgical needs, enabling variable tissue removal without requiring multiple different stapler devices.
Solution Approach 2:
A single central rod design incorporates multiple grooves that provide multiple mucosa removal volumes, making the stapler universally applicable to different surgical scenarios. The same rod serves multiple functions by enabling removal of different tissue volumes through selection of different groove engagement positions.
Data Source
AI summary
The head of a stapler for mucosectomy comprises an external goblet-shaped body (1) wherein an internal goblet-shaped body (2) is concentrically and slidingly located, at the edge of which a circular blade (3) is fixed. The internal goblet-shaped body (2) is provided with a central hole (5) wherein a rod (6) is slidingly inserted, at the end (7) of which an anvil (8; 8′) is fixed. One or more annular grooves (11), which are parallel and suitably spaced one from the other, are formed on the lateral surface of the rod (6) perpendicularly to the axis thereof. Said grooves (11) are intended to receive a portion of mucosa (9a) which is included in a purse string suture as the mucosa is tied around the rod (6). By retracting the rod (6) in the central hole (5) of the stem (2a) of the internal goblet-shaped body (2) the mucosa to be removed is carried into the internal goblet-shaped body (2). The anvil (8; 8′) and the circular blade (3) are moved closer one to the other, by suitable means, in order to cut the tissues when the stapler is in a closed position.