Endoscopic Puncture Device Segmented Sheath Design
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Solution Overview
Problem
Existing puncture devices for endoscopic retrograde cholangiopancreatography (ERCP) lack the necessary flexibility and rigidity to accurately and easily position and direct the needle tube for puncturing the duodenal papilla, which can lead to difficulties in accessing the bile duct effectively.
Innovation Solution
A puncture device comprising an outer sheath, an inner sheath with a coil structure, and a needle tube, where the inner sheath is designed to be easily bendable and the outer sheath provides rigidity, allowing precise positioning and direction of the needle tube within the endoscope treatment system, with a cover that is securely attached to prevent slippage and enhance puncture performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the puncture device is made flexible to reach the duodenal papilla, then it can be positioned at the target location, but it lacks the rigidity to maintain straight puncture direction
Solution Approach 1:
The puncture device is divided into multiple segments: an outer sheath, an inner sheath, and a needle tube. The inner sheath can be selectively advanced or retracted relative to the outer sheath, allowing the device to transition between flexible (for navigation) and rigid (for puncture) states. This segmentation enables the device to adapt its mechanical properties based on procedural needs.
Solution Approach 2:
The device incorporates dynamic elements including a movable inner sheath that can be advanced or retracted, and a coil sheath that can be expanded or compressed. These dynamic features allow the puncture device to change its flexibility and rigidity characteristics during different phases of the procedure, achieving both navigation flexibility and puncture stability.
2Stability of the object's composition
If the puncture device is made rigid to maintain puncture direction, then straight puncture is achieved, but it cannot be easily bent to the intended position
Solution Approach 1:
The device is segmented into an outer sheath and an inner sheath that can move independently. The inner sheath contains a coil structure that provides flexibility when retracted, while the needle tube provides rigidity when advanced. This segmentation allows the operator to easily bend the device during navigation while maintaining rigidity during puncture.
Solution Approach 2:
The coil sheath is constructed from a flexible material that allows easy bending and shaping during navigation to the duodenal papilla. This flexible shell structure enables the device to conform to anatomical pathways while maintaining the ability to transition to a rigid state for accurate puncture when needed.
3Ease of manufacture
If the cover is loosely attached to the coil sheath, then assembly is simple, but the cover slips off during operation
Solution Approach 1:
The cover incorporates localized engagement features such as ridges or interlocking structures at specific locations that provide secure attachment to the coil sheath. These local quality enhancements ensure reliable retention during operation while maintaining relatively simple overall assembly procedures. The engagement features are strategically positioned to prevent slippage without complicating the manufacturing process.
Data Source
AI summary
A puncture device according to an aspect of the present disclosure is a puncture device inserted into an endoscope channel, including: an outer sheath; an inner sheath inserted into the outer sheath; the inner sheath including; a coil sheath; and a needle tube located at a distal end of the coil sheath; a connecting portion connecting the needle tube and the coil sheath; and a cover covering the coil sheath and the connecting portion.