Endoscopic Cap Protrusions for Controlled Band Rolling
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Solution Overview
Problem
Existing medical devices for band ligation in endoscopic mucosal resection procedures often result in undesirable deployment of bands, leading to improper tissue compression and increased risk of tissue perforation due to sliding rather than rolling of bands along the cap surface.
Innovation Solution
A medical device with a tubular body featuring protrusions and grooves arranged in specific patterns on its outer surface to facilitate controlled rolling and deployment of bands, minimizing surface contact and friction, thereby ensuring proper band deployment and visibility during procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface features are provided on the cap-like structure to engage the bands during deployment, then band deployment control is improved, but visibility through and around the cap-like structure is limited
Solution Approach 1:
The cap surface features are designed with specific local properties: protrusions with rounded tops and grooves with specific depths and spacing. These localized surface characteristics provide band engagement control only where needed, while maintaining overall cap transparency for imaging.
Solution Approach 2:
The protrusions on the cap surface feature rounded tops rather than sharp edges. This curvature reduces friction and facilitates smooth band rolling motion, improving deployment control while the overall cap remains transparent.
2Speed
If bands slide along the cap surface during deployment, then deployment speed is improved, but band deployment accuracy deteriorates causing twisted and inverted deployment
Solution Approach 1:
The protrusions feature rounded tops that facilitate rolling motion of the bands. This curvature allows bands to roll smoothly along the cap surface rather than sliding, maintaining both deployment speed and accuracy by preventing twisted and inverted deployment.
Solution Approach 2:
The cap surface features are designed to dynamically interact with the bands during deployment. The grooves and protrusions work together to guide band motion, transitioning from initial engagement to controlled rolling deployment, ensuring accurate positioning throughout the process.
3Manufacturing precision
If surface features are added to the cap to engage bands, then band compression control is improved, but device complexity increases
Solution Approach 1:
Rather than adding complex mechanical components, the solution uses localized surface features (protrusions and grooves) on the cap itself. These simple geometric modifications provide controlled band engagement and tissue compression without increasing overall device complexity.
Solution Approach 2:
The cap surface features are designed with specific geometric parameters: protrusion height, groove depth, and spacing between features. By optimizing these parameters, controlled band deployment and tissue compression are achieved through simple geometric design rather than complex mechanisms.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C
AI summary
According to an embodiment of the present disclosure, a medical device for deploying a ligation band may include a tubular body. The tubular body may include a proximal end, a distal end, a radially inner surface defining a lumen through the tubular body, and a radially outer surface. The radially outer surface may include protrusions arranged in rows extending at least partially around a proximal region of the radially outer surface. Protrusions in adjacent rows may be separated by a first distance. Surface features may extend at least partially around a distal region of the radially outer surface. Adjacent surface features may be separated by a second distance larger than the first distance.