Puncture Set Protrusion Alignment Mechanism
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Solution Overview
Problem
Existing puncture sets face difficulties in reliably coupling the puncture needle unit's needle hub with the plunger of the puncture device due to oblique insertion, leading to improper mounting and inefficient blood sampling for diabetic patients.
Innovation Solution
The puncture set incorporates a design with casing protrusions on the puncture needle unit and mount protrusions on the puncture device, ensuring proper alignment and coupling of the needle hub with the plunger through a mechanism of concentric hollow cylindrical portions and ridged protrusions, preventing rotational misalignment and facilitating easy insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clearance (gap) is provided between the casing of the puncture needle unit and the mount of the puncture device to allow easy insertion, then the ease of operation is improved, but the puncture needle unit may be inserted obliquely resulting in improper mounting and unreliable coupling
Solution Approach 1:
The patent applies preliminary action by providing guide protrusions on the mount that engage with guide recesses on the casing before the puncture needle unit is fully inserted. This preliminary engagement guides the puncture needle unit into proper alignment and prevents oblique insertion, ensuring reliable coupling between the needle hub and plunger while still allowing easy insertion through the clearance gap.
2Device complexity
If the puncture needle unit is inserted without guidance mechanisms, then the device complexity is reduced, but the manufacturing precision of coupling alignment deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the mounting interface into distinct functional elements: guide protrusions on the mount, guide recesses on the casing, and the coupling interface between needle hub and plunger. This segmentation allows each element to perform its specific function independently, achieving precise coupling alignment through simple geometric features rather than complex integrated mechanisms.
Data Source
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AI summary
A puncture set includes a puncture needle unit and puncture device. The puncture needle unit includes a puncture needle having a needle body that is provided with a sharp needle point at its tip and also having a needle hub fixed to the base end of the needle body, and the puncture needle unit also includes a tubular casing for receiving the puncture needle so that the puncture needle can move in the longitudinal direction of the casing and having an opening from which the needle point can project. The puncture device has a housing, a ring-shaped installation section provided at the head of the housing and having the casing removably installed on the inner side of the installation section, and a plunger received in the housing and having a connection section connected to the needle hub in an installed state where the casing is installed on the installation section. The casing has casing-side projections projecting from the outer periphery of the casing and arranged in the circumferential direction of the outer periphery. The installation section has installation section-side projections projecting from the inner periphery of the installation section and arranged in the circumferential direction of the inner periphery. In the installed state, at least one installation section-side projection is located between adjacent casing-side projections.