Double-Needle Puncture Device Retracting Outer Needle
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Solution Overview
Problem
Conventional puncture needles with a double structure face challenges in reducing the diameter of the indwelled needle, which affects user comfort, as the outer needle needs to be larger than the metal inner needle, making it difficult to minimize the needle diameter.
Innovation Solution
A puncture device with a double structure featuring a metal outer needle and a resin inner needle, where the outer needle is retracted into a housing unit while the inner needle remains indwelled, allowing for a smaller diameter and easier insertion and retraction process through a push-in operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer needle diameter is increased to accommodate the metal inner needle, then the structural integrity and ease of insertion are improved, but the user burden and pain increase due to larger needle diameter
Solution Approach 1:
The puncture needle is divided into two separate components: an outer needle for insertion and an inner needle for indwelling. The outer needle has a larger diameter for ease of insertion and structural integrity, while the inner needle has a smaller diameter for reduced user burden during indwelling. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The metal inner needle is extracted from the outer needle after insertion. The outer needle serves its purpose of penetrating the skin and is then removed, leaving only the thin inner needle indwelling. This extraction eliminates the need for the large-diameter needle to remain in the body, thereby reducing user burden while maintaining the structural advantages of the larger outer needle during insertion.
2Object-affected harmful factors
If the outer needle diameter is reduced to minimize user burden, then the pain and discomfort are decreased, but the structural integrity and ability to accommodate the inner needle are compromised
Solution Approach 1:
By segmenting the needle system into outer and inner components, the design allows the outer needle to have sufficient diameter for structural integrity and easy insertion, while the inner needle can be made very thin for minimal user burden. Each segment is optimized independently for its specific role in the insertion and indwelling process.
Solution Approach 2:
The inner needle is nested within the outer needle during the insertion phase. The outer needle provides structural support and a larger diameter for easy penetration, while the inner needle is protected and guided by the outer needle. After insertion, the inner needle is extracted and used independently, providing the benefits of a thin indwelling needle without compromising the structural advantages of the larger outer needle during insertion.
3Ease of operation
If a double structure with both needles indwelled is used, then the puncture mechanism is simplified, but the device complexity and size increase
Solution Approach 1:
The outer needle is extracted from the indwelling structure after insertion. This extraction simplifies the indwelling configuration to a single thin needle, reducing device complexity and size during the usage phase. The temporary double-needle structure during insertion provides operational simplicity, while the subsequent extraction eliminates the need to manage a complex dual-needle indwelling system.
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
This design significantly reduces user burden by enabling a smaller indwelled needle diameter and simplifies the insertion and retraction process, improving comfort and device compactness.
Implementation Method 1
an elastic member one end of which is fixed to the housing unit and the other end of which is fixed to the outer needle slide unit
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3(A)~3(B)
AI summary
Provided according to the present invention are a puncture device and a chemical liquid supplying device capable of considerably reducing a burden imposed on a user. When a push-in unit 5A is pushed in, an outer needle 65 containing an inner needle 68 inside is inserted into the body of a user in accordance with downward sliding of a center unit 5D of a puncture mechanism 5. When the push-in unit 5A is completely pushed in, stopper levers 72A and 72B of the center unit 5D open and return only an outer needle slide unit 66 of the center unit 5D to the original position by the restoring force of a coil spring 85. This retracts only the outer needle 65 into a chemical liquid supplying device 1 with the inner needle 68 indwelled within the body of the user. In this case, the indwelled needle is the inner needle 68, wherefore the diameter of the indwelled needle is easily made smaller in comparison with a conventional puncture needle whose indwelled needle is the outer needle 65. Accordingly, a burden imposed on the user can decrease.