Guide Wire Cover Restricts Needle Movement
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Solution Overview
Problem
Existing guide wires for interatrial septum puncture face risks of erroneous puncture due to exposed inner needles, which can lead to complications such as cardiac tamponade, and lack safety features to prevent damage to the needle or surrounding tissues.
Innovation Solution
A guide wire with a flexible elongated shaft, a puncture portion featuring a sharp needle, and an elastically deformable cover portion that includes a sparse pitch portion and a distal end cover, where the cover portion covers the puncture portion to prevent erroneous puncture and restricts relative movement, ensuring high safety by accommodating the needle and preventing exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner needle is exposed in the outer needle to enable puncture, then the puncture function is improved, but the risk of erroneous puncture and damage to surrounding tissues increases
Solution Approach 1:
The inner needle is nested within the outer needle, with the distal end of the inner needle accommodated inside the outer needle in a linearly stretched state. The cover portion covers the exposed distal end of the inner needle during non-puncture phases, while allowing the needle to protrude when needed for puncture.
Solution Approach 2:
The distal end of the inner needle is pre-bent to face the proximal end side before puncture. This preliminary configuration ensures that after puncturing, the needle automatically bends and faces the proximal end, preventing erroneous puncture without requiring additional control mechanisms.
2Ease of manufacture
If the mechanical needle is used for puncture, then the cost is reduced, but the risk of erroneous puncture due to excessive pressing increases
Solution Approach 1:
The mechanical needle is nested within a protective outer needle and cover portion, maintaining the cost-effectiveness of the mechanical needle while adding safety features. The cover portion can be made from simpler materials compared to radio frequency needles, keeping manufacturing costs low.
Solution Approach 2:
The outer needle and cover portion act as intermediary protective structures between the operator and the sharp inner needle. These intermediaries prevent direct contact with the needle during insertion and transport, reducing erroneous puncture risk without requiring expensive radio frequency technology.
3Ease of operation
If the inner needle is always exposed to enable puncture, then the puncture function is improved, but the needle may damage the outer needle or be damaged itself
Solution Approach 1:
The inner needle is nested within the outer needle during insertion and transport phases, protecting both needles from damage. The needle configuration allows the inner needle to protrude only when needed for puncture, minimizing exposure time and damage risk.
Solution Approach 2:
The distal end of the inner needle is pre-bent and accommodated in the outer needle before puncture. This preliminary protected state prevents damage during insertion, and the needle only becomes exposed when intentionally advanced for the puncture action.
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
The guide wire effectively prevents erroneous punctures and ensures high safety by maintaining the needle within the cover portion, reducing the risk of damage to the needle or surrounding tissues, thereby enhancing the safety and accuracy of the puncture process.
Implementation Method 1
a cover portion that is elastically deformable and covers the puncture portion. The cover portion includes a sparse pitch that has a wire member wound in a spiral shape and is contractible along a central axis of winding
Data Source
AI summary
A guide wire for guiding a dilator to be inserted into a living body includes: a flexible elongated shaft portion; a puncture portion at a distal end portion of the shaft portion to form a hole in biological tissue; and an elastically deformable cover portion covering the puncture portion. The cover portion includes a sparse pitch portion that has a wire member wound in a spiral shape and axially contractible, and a distal end cover located on a distal end side of the sparse pitch portion and covering at least a part of the puncture portion. The puncture portion includes a first contact portion. The distal end cover includes a second contact portion configured to contact the first contact portion from a proximal end side, so that relative axial movement of the first and second contact portions is restricted by the first contact portion contacting the second contact portion.