Endoscope Bonding Structure With Stepped Shaft Diameter
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Solution Overview
Problem
Existing endoscope bonding structures face challenges in ensuring a secure and leak-proof attachment of the tubular body to the distal end rigid member, particularly with bonding agents, as they tend to leak or fail to uniformly cover the outer periphery due to uneven diameters and lack of effective pressure distribution.
Innovation Solution
The endoscope bonding structure features a shaft with distinct outer diameter parts and a tubular body with corresponding inner diameter parts, where the tubular body is fitted loosely and pressed to ensure the bonding agent fills the gap between the outer and inner peripheries, with a second outer diameter part decreasing in diameter towards the proximal end, allowing uniform bonding agent distribution without leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bonding agent is applied to the outer periphery of the fitting site to bond the distal end rigid member to the tubular body, then the tubular body is fixed to the shaft, but the bonding agent leaks or fails to uniformly cover the outer periphery due to uneven diameters
Solution Approach 1:
The patent applies local quality by creating a stepped structure with different diameters at different positions along the shaft. The first outer diameter part has a larger diameter than the second outer diameter part, allowing the bonding agent to be contained and distributed uniformly in specific zones. This local variation in geometry ensures reliable bonding without leakage by adapting the structure to the bonding agent's flow characteristics in different regions.
Solution Approach 2:
The shaft's outer periphery is segmented into distinct parts: a first outer diameter part and a second outer diameter part with different diameters. This segmentation creates separate bonding zones that prevent the bonding agent from leaking while ensuring uniform coverage. The tubular body's inner periphery is similarly segmented into a first inner diameter part and a second inner diameter part to match the shaft's segmentation.
2Strength
If the tubular body is tightly fitted to the shaft, then the attachment is secure, but the bonding agent cannot fill the gap uniformly
Solution Approach 1:
The patent creates different fit tightness in different zones by varying the outer diameter of the shaft. The first outer diameter part provides a looser fit that allows bonding agent to flow and fill gaps uniformly, while the second outer diameter part provides a tighter fit for secure attachment. This local differentiation resolves the contradiction between secure attachment and uniform bonding agent distribution.
3Device complexity
If the outer diameter of the shaft is uniform, then the structure is simple, but the bonding agent leaks or does not distribute uniformly
Solution Approach 1:
Instead of maintaining a uniform diameter for simplicity, the patent introduces local variations in the shaft's outer diameter. The first outer diameter part and second outer diameter part have different diameters, creating a stepped structure that improves bonding performance by preventing leakage and ensuring uniform distribution, while adding minimal complexity to the overall design.
Data Source
AI summary
An endoscope bonding structure includes a distal end rigid member, a tubular body, and a bonding agent. The distal end rigid member includes a first outer diameter part and a second outer diameter part. The tubular body includes a first inner diameter part and a second inner diameter part. An outer diameter of an outer periphery of the second outer diameter part decreases as a distance increases toward a proximal end side. The tubular body is fitted to an outer periphery in a state in which the tubular body is pressed to a distal end side.