Syringe Metering Device Anti-Collision Guide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dosing devices for syringes made of flexible plastics, such as polypropylene, are prone to damage when twisted due to deformation of guide lugs and guide grooves, leading to potential destruction of the expensive scanning device, especially when large-volume syringes with adapters are used.
Innovation Solution
The dosing device incorporates an axial guide means with a guide contour that receives alignment lugs, allowing the syringe to be displaced out of alignment when rotated, preventing the scanning surfaces from contacting the scanning device and thus avoiding damage by moving the fastening section away from the scanning device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the syringe is made of flexible plastic to allow easy insertion and adjustment, then the ease of operation is improved, but the reliability of the alignment mechanism deteriorates because the guide lugs can deform and push out of the guide grooves when rotated
Solution Approach 1:
The patent introduces a resilient element (spring) that pre-compresses the guide lugs against the guide grooves, creating a cushioning force that prevents the lugs from deforming and escaping during rotation. This prior cushioning compensates for the flexibility of the plastic syringe while maintaining alignment stability.
Solution Approach 2:
The patent utilizes the flexible nature of the plastic syringe body but isolates the critical alignment components (guide lugs and grooves) from excessive deformation by providing structural support through the resilient element, allowing the shell to remain flexible for ease of insertion while maintaining rigidity where needed for reliability.
2Measurement precision
If the scanning device protrudes close to the scanning surfaces for accurate reading, then the measurement precision is improved, but the object-generated harmful factors worsen because the scanning surfaces can shear off the protruding nubs when the syringe is rotated
Solution Approach 1:
The resilient element provides pre-compression that cushions the interaction between the guide lugs and grooves, preventing the syringe from rotating enough to cause the scanning surfaces to contact and damage the protruding scanning device. This prior cushioning protects the vulnerable components while maintaining close proximity for accurate scanning.
Solution Approach 2:
The resilient element acts as an intermediary between the guide lugs and grooves, absorbing the forces that would otherwise transmit rotation to the scanning device. This mediator protects the scanning device from harmful forces while allowing the alignment mechanism to function properly.
3Reliability
If the guide lugs are tightly fitted in the guide grooves to prevent rotation, then the reliability is improved, but the ease of operation deteriorates because the syringe cannot be easily inserted or adjusted
Solution Approach 1:
The patent transforms the static, rigid guide lug-groove interface into a dynamic system with a resilient element that allows controlled movement during insertion and adjustment, then provides stable engagement during operation. The guide lugs can flex within the grooves during insertion but are firmly held during use, achieving both ease of operation and reliability.
Solution Approach 2:
The resilient element changes the mechanical parameters of the guide lug-groove interface, allowing it to transition from a loose fit (easy insertion) to a tight fit (reliable alignment) under operational loads. The spring constant and pre-compression force are optimized to provide the right balance between ease of insertion and alignment stability.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Dosing device for use with a syringe (19), comprising a mounting section (21) on a syringe cylinder (20) with at least one axially directed scanning surface (23) projecting from the top and at least one alignment lug projecting from the outer circumference of the mounting section, and a piston with a piston rod, with an axial opening for axially inserting the mounting section into • a scanning device (6) arranged in a receptacle (3) with at least one scanning means projecting from a base surface facing the axial opening for scanning the at least one scanning surface (23) of a mounting section (21) inserted in the mounting position, and • at least one axial guide means for aligning the at least one alignment lug into an angular position with respect to rotation about the axis of the dosing device,in which the syringe (19) is axially aligned with at least one scanning surface on at least one scanning means, wherein • the axial guide means is located in the receptacle below the scanning device, wherein the guide means has a guide contour on the side facing the axial opening, • which has at least one recess for receiving at least one alignment lug when the syringe is arranged with the mounting section and piston rod in their mounting positions, and • which has at least one raised portion adjacent to the recess at a greater distance Δh from the underside of the scanning device than the at least one recess, wherein the syringe with the at least one alignment lug can be displaced from the at least one recess onto the at least one raised portion.