Wobbling Device Self-Alignment for Infusion Pump Accuracy
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Solution Overview
Problem
Infusion devices with peristaltic pumps face accuracy issues due to lateral mismatches between the wobbling device and the pump module, leading to inaccuracies in flow rate, as the position of the pump module with respect to the wobbling device can deviate from the ideal position, affecting the stroke volume and flow rate accuracy.
Innovation Solution
The wobbling device is made displaceable along directions transverse and longitudinal to the rotational axis, allowing for adjustment and self-alignment with the pump module, ensuring optimal positioning and reducing inaccuracies in stroke volume, thereby improving flow rate accuracy. This is achieved through a mechanism where the wobbling device can be elastically pretensioned and mounted on a carrier element that is connected to the housing via a deformable connection element, allowing dynamic displacement to correct for positional tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump module is attached to the receptacle in a form locking manner with the wobbling device at a defined position, then the pump module is held securely in the receptacle, but lateral tolerances cause positional deviations from the ideal position, affecting flow rate accuracy
Solution Approach 1:
The wobbling device is made displaceable along at least one direction transverse to the rotational axis through a deformable connection element, allowing dynamic adjustment of the wobbling device's position to compensate for lateral tolerances and achieve optimal alignment with the pump module, thereby resolving the contradiction between secure attachment and flow rate accuracy
Solution Approach 2:
The connection element's deformability allows change in the spatial relationship between the wobbling device and the pump module, enabling adjustment of positional parameters to achieve accurate alignment while maintaining secure attachment
2Measurement precision
If the wobbling device is made displaceable to correct lateral mismatches, then flow rate accuracy is improved, but the device complexity increases due to the deformable connection element mechanism
Solution Approach 1:
The connection element is designed as a deformable component that provides the necessary displacement capability through its flexibility, achieving the complex function of positional adjustment without requiring multiple rigid parts and complex assembly mechanisms, thus improving flow rate accuracy while limiting the increase in device complexity
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
This solution ensures improved flow rate accuracy by allowing for precise adjustment and self-alignment of the wobbling device with the pump module, minimizing deviations in stroke volume and enhancing the overall performance of the infusion device.
Implementation Method 1
the wobbling device is elastically pretensioned with respect to the housing element along the rotational axis in a direction pointing towards the receptacle
Implementation Method 2
the carrier element is connected to the housing via a deformable connection element, allowing dynamic displacement to correct for positional tolerances
Data Source
AI summary
An infusion device (3) comprises a housing element (30) having a receptacle (301) for receiving a pump module (1), and a pump actuation mechanism (2) having a wobbling device (20) arranged on the housing element (30) and a drive shaft (21) being rotatable about a rotational axis (A). The wobbling device (20) is actuatable, by rotating the drive shaft (21) about the rotational axis (A), to perform a tumbling motion with respect to the receptacle (300) for acting onto the pump module (1) received in the receptacle (300) in order to pump a fluid through the pump module (1). Herein, the wobbling device (20) is displaceable along at least one direction (X, Y) transverse to the rotational axis (A) with respect to the receptacle (300). In this way an infusion device is provided which in an easy and cost-efficient manner allows for improving the positional accuracy of the pump module with respect to the wobbling device of the pump actuation mechanism upon arranging the pump module on the receptacle of the housing element.