Coaxial Needle Disc Roller for Uniform Rotation
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Solution Overview
Problem
Conventional needle disc roller apparatuses face challenges in reliable drug delivery due to uneven rotation of needle discs, permanent deformation of elastic incision portions, and cumbersome assembly processes, leading to inefficient needling procedures and potential skin damage.
Innovation Solution
A coaxial double rotation type needle disc roller apparatus with a core and hollow rotation shaft, restraining needle discs with spacers, and a viscoelastic drug delivery mechanism that elastically expands a valve hole for precise drug delivery and one-touch sealing connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a plurality of needle discs are simply rotatably mounted on one shaft, then the structure is simple, but the needle discs rotate unevenly causing deviation and unreliable operation
Solution Approach 1:
The patent divides the single shaft into two separate coaxial shafts (inner shaft and outer shaft), each independently supporting needle discs. This segmentation allows independent rotation control of each shaft, eliminating the deviation problem that occurs when multiple needle discs share a single shaft. The segmentation principle directly resolves the contradiction by maintaining structural simplicity while achieving reliable uniform rotation through separate shaft mechanisms.
Solution Approach 2:
The patent introduces a gear mechanism as an intermediary between the two coaxial shafts. The gear transmits and synchronizes rotation between the inner and outer shafts, ensuring uniform rotational movement of all needle discs. This intermediary component enables reliable operation by coordinating the rotation of multiple needle discs while maintaining the simplicity of the overall structure.
2Productivity
If an incision portion with valve structure is used in the drug container, then the drug can be delivered, but the incision portion undergoes permanent deformation and becomes unusable over time
Solution Approach 1:
The patent changes the physical state and mechanical properties of the valve membrane by selecting specific viscoelastic materials and optimizing membrane thickness parameters. This allows the membrane to undergo elastic deformation during drug delivery and then fully recover its original shape, preventing permanent deformation. The parameter changes in material selection and thickness enable repeated use while maintaining drug delivery capability.
Solution Approach 2:
The patent employs composite material design for the valve membrane, using viscoelastic materials that combine elasticity and damping properties. This composite approach allows the membrane to flex during drug delivery and return to its original configuration, extending the service life of the drug container while maintaining reliable drug delivery function over multiple uses.
3Device complexity
If the entire needle disc roller is rotated with respect to one shaft, then the structure is simple, but the smoothness of rotation is reduced and skin damage may occur
Solution Approach 1:
The patent segments the rotation mechanism into two independent coaxial shafts, each capable of smooth independent rotation. This eliminates the friction and binding issues that occur when multiple needle discs are forced to rotate on a single shaft. The segmentation allows each shaft to rotate smoothly without compromising structural simplicity, directly improving ease of operation.
Solution Approach 2:
The patent introduces dynamic capability by allowing the inner and outer shafts to rotate independently and be controlled separately. This dynamic design enables smooth rotation of each needle disc assembly without the mechanical interference that occurs in single-shaft systems. The dynamic independence of the two shafts improves rotation smoothness while maintaining operational simplicity.
4Device complexity
If needle discs are not restrained with spacers, then the assembly is simple, but the needle discs may rotate unevenly causing unreliable operation
Solution Approach 1:
The patent introduces spacers as intermediary components between the needle discs and the shafts. These spacers serve as positioning elements that restrain the needle discs at fixed intervals, ensuring uniform rotation and proper alignment. The spacers act as mediators that maintain reliable operation without significantly complicating the assembly structure, as they are simple cylindrical components that fit into the shaft grooves.
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
Enables efficient needling with reliable drug delivery and minimal permanent deformation, improving the assembly process and reducing the risk of skin damage during rotation.
Implementation Method 1
a valve membrane (123) of a viscoelastic material having a valve hole (1232) which is formed in the connection cap (12) and communicates with a front end opening of the drug container
Implementation Method 2
a viscoelastic connection cap (12) coupled to cover a front end opening of a drug container (2)
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A coaxial rotating needle disc roller apparatus is disclosed. The coaxial rotating needle disc roller apparatus comprises: a connecting cap (12); a roller guiding holder (14) coupled to a front end of the connecting cap (12); and a needle disc roller (20) maintained to be frontward and rearward moveable to the roller guiding holder (14). The needle disc roller (20) comprises: a roller bracket (22) installed to be linearly frontward and rearward moveable along a guide groove (142) formed in the roller guiding holder (14); a core rotation shaft (21) installed to be rotatable with respect to the roller bracket (22); a roller bobbin (24) installed to be rotatable with respect to the core rotation shaft (21); and a plurality of ring-shaped needle discs (26) and a plurality of ring-shaped spacers (28) both pluralities being restrained to the roller bobbin (24) and rotating, together with the roller bobbin (24), with respect to the core rotation shaft (21).