Medical Device Tip Locking Mechanism
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Solution Overview
Problem
The existing medical devices with detachable tips require precise alignment of threads of different pitches, leading to increased manufacturing costs, longer assembly times, and difficulties in sterilization due to convoluted threading surfaces.
Innovation Solution
A medical device design that attaches and detaches tips from tube ends using a push/pull operation through a locking mechanism involving recesses, lock tabs, and springs, eliminating the need for threading, thereby reducing crevices for contamination and simplifying sterilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threading with different pitches is used to connect the tip to the tube end, then precise mechanical shifting and differentiation are achieved, but manufacturing complexity and cost increase due to fine machining requirements
Solution Approach 1:
The patent extracts the threading mechanism entirely from the connection system. Instead of using threaded connections between the tip and tube end, the invention employs a bayonet-style coupling with a cam groove and latch mechanism. This eliminates the need for fine machining of threads while maintaining precise mechanical alignment and positioning capabilities.
Solution Approach 2:
The patent inverts the traditional threading approach by using a positive engagement mechanism (cam groove and latch) rather than screw threads. The cam groove provides guided insertion and automatic alignment, while the latch secures the connection, replacing the need for differential threading to achieve mechanical differentiation.
2Manufacturing precision
If threading with different pitches is used to connect the tip to the tube end, then mechanical differentiation is achieved, but assembly time increases due to intricate alignment requirements
Solution Approach 1:
The patent incorporates preliminary action through the cam groove design, which pre-aligns the tip with the tube end during insertion. The cam groove geometry guides the latch into the correct position automatically, eliminating the need for manual alignment of multiple thread pitches. The spring-loaded latch also pre-positions itself to engage with the cam groove at the correct orientation.
Solution Approach 2:
The bayonet coupling mechanism is self-aligning and self-securing. The cam groove and latch work together to automatically differentiate and secure the mechanical connection without requiring the surgeon to manually align threads. The spring provides automatic engagement force, making the assembly process intuitive and rapid.
3Reliability
If threading is used to connect the tip to the tube end, then secure attachment is achieved, but sterilization effectiveness decreases due to convoluted surfaces that trap contamination
Solution Approach 1:
The patent extracts the threading structure entirely, replacing it with smooth cam groove surfaces and a latch mechanism. This eliminates the convoluted thread crevices that trap contamination, while the cam groove maintains secure attachment through its curved geometry that guides and locks the latch in place. The smooth surfaces are much easier to clean and sterilize effectively.
4Manufacturing precision
If threading with different pitches is used, then precise positioning is achieved, but manufacturing cost increases due to iterative testing and hand adjustments
Solution Approach 1:
The patent removes the threading requirement entirely, eliminating the need for fine machining operations and iterative testing. The cam groove can be machined with standard tolerances using automated processes, and the latch mechanism provides self-aligning features that reduce the need for hand adjustments and skilled machinist intervention.
Solution Approach 2:
The patent changes the connection parameter from threaded engagement to cam-based geometric engagement. The cam groove profile provides built-in alignment and positioning features through its geometry, eliminating the need for precise thread pitch matching and reducing manufacturing tolerances to standard automated machining capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates faster and safer attachment/detachment of medical device tips, reduces manufacturing complexity and costs, and enhances sterilization effectiveness by minimizing convoluted surfaces.
Implementation Method 1
a spring located on the other of the yoke and the inner shaft to engage the locking cavity
Data Source
AI summary
A medical device includes a tube end to which a tip having a medical tool is attached. The tip includes a tip housing and a lock tab, as well as a yoke. The tube end includes an outer tube and an inner shaft, in which the inner shaft engages the yoke and the outer tube engages the tip housing. The lock tab fits into a recess in the outer tube to prevent twisting of the tip when engaged with the tube end, and the yoke includes a locking ring to which a spring protrudes, to fixedly and detachably connect the tip to the tube end.