Puncture Device Inner Tube Locking Mechanism
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Solution Overview
Problem
Existing puncture devices for lumens like bile ducts and pancreatic ducts risk unintentional advancement of guidewires due to the sharp edges of needle tubes, which can damage the guidewires during insertion and retrieval.
Innovation Solution
A puncture device with a retractable needle tube and inner tube system, featuring a locking mechanism that allows the inner tube to be either accommodated within or protruded from the needle tube, preventing guidewire damage and ensuring controlled advancement and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective tube is inserted into the needle tube to prevent guidewire damage, then guidewire protection is improved, but device complexity increases due to additional components and operations
Solution Approach 1:
The protective tube is nested within the needle tube, with the distal end of the protective tube inserted into the needle tube. This nesting configuration allows the protective tube to be stored compactly during puncture operations and automatically positioned to protect the guidewire when needed, reducing the need for separate handling operations.
Solution Approach 2:
The protective tube is pre-positioned within the needle tube before guidewire insertion. The distal end of the protective tube is advanced into the needle tube in advance, so that when the guidewire is inserted through the protective tube, it is already protected from the sharp edges of the needle tube, eliminating the need for reactive protection measures.
2Reliability
If the protective tube is made advanceable and retractable independently, then guidewire protection is improved, but ease of operation deteriorates due to coordinated manipulation requirements
Solution Approach 1:
The puncture device is segmented into functionally independent components: the needle tube assembly and the protective tube assembly. Each can be advanced and retracted independently through their respective operational mechanisms, allowing the operator to control the needle tube for puncture operations while separately managing the protective tube for guidewire protection, simplifying the operational sequence.
Data Source
AI summary
A puncture device comprises an elongate sheath, defining a longitudinal axis direction; a needle tube, carried in the sheath, the needle tube configured to be movable in the longitudinal axis direction; a needle slider, connected to the needle tube; an inner tube, carried in the needle tube, the inner tube defining a lumen configured to receive a guide wire; a tube slider, connected to the inner tube, the tube slider configured to support the inner tube such that the inner tube is movable in the longitudinal axis direction; and a locking member, configured to lock the needle slider relative to the tube slider in a first state and in a second state, wherein: in the first state, a distal end of the inner tube is positioned in the needle tube; and in the second state, the distal end of the inner tube is positioned to protrude from the needle tube.