Side-Opening Injection Needle Curvature for Lower Piercing Resistance
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Solution Overview
Problem
Side-hole injection needles experience increased piercing resistance and risk of intradermal internal bleeding or blood vessel damage due to edge portions when moved or rotated in the skin, particularly during cosmetic procedures.
Innovation Solution
The injection needle design features a gently curved distal and rear end side surface chamfered portions at the edges of the side surface opening, formed through wire electric discharge machining, to reduce piercing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a side-hole injection needle is moved or rotated in the skin to spread medical solution widely, then the coverage area increases, but the piercing resistance increases and risk of intradermal internal bleeding or blood vessel damage occurs
Solution Approach 1:
The invention applies curvature by forming gently curved surface chamfered portions at the edges of the side surface opening. These curved surfaces replace sharp edges, reducing piercing resistance when the needle is moved or rotated in the skin, thereby allowing wider coverage without increasing harmful piercing effects.
2Area of stationary object
If a side-hole injection needle is moved or rotated in the skin to spread medical solution widely, then the coverage area increases, but the risk of intradermal internal bleeding or blood vessel damage increases
Solution Approach 1:
The gently curved surface chamfered portions at the edges of the side surface opening reduce the risk of intradermal internal bleeding and blood vessel damage by eliminating sharp edges that could cause tissue damage during needle movement or rotation, enabling safer wider coverage.
3Strength
If edge portions are present at the side surface opening, then the structural integrity is maintained, but the piercing resistance increases
Solution Approach 1:
The gently curved surface chamfered portions maintain structural integrity while reducing piercing resistance by replacing sharp edges with curved surfaces at the side surface opening, allowing the needle to move smoothly through tissue without compromising strength.
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 design effectively reduces piercing resistance by up to 10% in both forward and return paths, minimizing the risk of intradermal bleeding and blood vessel damage.
Implementation Method 1
formed through wire electric discharge machining
Data Source
Figure 1~2
Figure 3(a)~4A
Figure 4B~5B
AI summary
In order to provide an injection needle capable of reliably reducing the piercing resistance even when the injection needle has a side opening, there is provided an injection needle 10 including: a main body 12 portion having a hollow cylindrical shape; a distal end portion 14 having a curved outer shape, the distal end portion 14 being joined so as to close a distal end of the main body portion 12; and a side surface opening portion 20 opened on a side surface of the main body portion 12, wherein a region surrounding the side surface opening portion 20 has a substantially arc-shaped concave shape in a side view along an axial direction G in a state where the side surface opening portion 20 is disposed on an upper side, wherein a distal end side surface chamfered portion 30 having a gently curved surface is provided at a position corresponding to an edge on a distal end side of the concave shape, and wherein a rear end side surface chamfered portion 40 having a gently curved surface is provided at a position corresponding to an edge on a rear end side of the concave shape.