Syringe Pump Holding Device with Offset Pivot Pinions
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Solution Overview
Problem
Existing syringe pump holding devices are complex, require a high number of parts, and are not adaptable to syringes with varying piston head thicknesses, leading to inefficiencies and safety risks due to siphoning phenomena.
Innovation Solution
A simplified holding device design with integral pinions on the arms that combine translation and rotation movements, using helical sets of teeth to reduce the number of parts and minimize friction, allowing for adjustable locking of syringe piston heads regardless of thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate mechanisms (pivoting mechanism and translation mechanism) are used to drive the arms, then the arms can achieve both rotation and translation movements, but the device complexity increases and the number of parts increases
Solution Approach 1:
The patent combines the pivoting mechanism and translation mechanism into a single integrated mechanism. The arm is designed with a pivot axis that is offset from the arm's longitudinal axis, allowing the arm to simultaneously achieve both rotation and translation movements through one unified mechanism rather than requiring separate mechanisms for each function.
Solution Approach 2:
The single mechanism serves multiple functions by designing the pivot axis offset from the arm's longitudinal axis. This universal mechanism can produce both rotational movement (for opening/closing the arms) and translational movement (for adjusting to different piston head thicknesses), making one mechanism perform the work of what would traditionally require two separate mechanisms.
2Adaptability or versatility
If a high number of parts are used in the holding device, then the functionality and adaptability are improved, but the manufacturing cost increases and the risk of jamming increases
Solution Approach 1:
By merging the pivoting and translation functions into a single mechanism with an offset pivot axis, the patent reduces the total number of parts. This consolidation eliminates multiple connection points and moving interfaces between separate mechanisms, thereby reducing the overall risk of jamming while maintaining full adaptability to different syringe types.
3Device complexity
If traditional pivoting arms are used without translation capability, then the device complexity is reduced, but the adaptability to different piston head thicknesses is lost
Solution Approach 1:
The patent introduces dynamic adaptability by offsetting the pivot axis from the arm's longitudinal axis. This dynamic design allows the arm to automatically adjust its position and achieve both rotation and translation movements during operation, enabling adaptation to different piston head thicknesses without requiring complex adjustable mechanisms or multiple parts.
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 solution reduces the risk of jamming, enhances reliability, and lowers manufacturing costs by minimizing the number of parts subjected to translation, while ensuring secure locking of syringe piston heads across different sizes, thus preventing siphoning and improving safety.
Implementation Method 1
each arm (31, 36) carries a pinion (33, 38) pivotable about its axis and movable in translation... means for converting a portion of the movement of the control member into a translation movement of at least one pinion (33, 38)... means for converting a portion of the movement of the control member into a rotation movement of at least one pinion (33, 38)
Data Source
AI summary
A holding device for locking the head of a syringe piston on a pusher has arms connected to respective pinions pivotable and translationally displaceable so that the corresponding arm is involved in the same motion between a rest position, in which the arms are closed and pressed against the pusher, and an open position, in which the arms are opened and remote therefrom, the translation is carried out prior to rotation during the movement toward the open position or in reverse order toward the rest position. The holding device also has a control member and means for converting a part of the control member movement by transmitting it to at least one pinion as a translation movement, which are translationally locked, and means for converting a part of the control member movement by transmitting it to at least one pinion as a rotation movement.