Syringe Pump Drive Head Parasitic Force Isolation
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Solution Overview
Problem
Existing syringe pumps face challenges in accurately measuring the inner pressure of a syringe due to parasitic forces that can distort pressure sensor readings, leading to inaccurate force measurements.
Innovation Solution
A drive head design featuring a contact portion, holding elements, and a pressure sensor support that mounts the holding element via the pressure sensor support, allowing precise force measurement by separating parasitic forces and using a strain gauge to determine the syringe plunger's force on the contact portion, with the pressure sensor support designed to maintain parallel deformation and avoid inclining during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the holding element is mounted via the housing of the drive head, then the structure is simpler, but parasitic forces are transferred to the contact portion and pressure sensor causing measurement inaccuracies
Solution Approach 1:
The pressure sensor support acts as an intermediary component between the holding element and the housing. It provides a dedicated mounting interface for the holding element that is integrated with the pressure sensor assembly, allowing force measurements to be taken at the contact portion without direct transmission of parasitic forces through the housing structure.
Solution Approach 2:
The mounting structure is segmented into separate functional components: the pressure sensor support (which holds both the pressure sensor and holding element), the contact portion (which receives force from the plunger), and the housing (which provides structural support). This segmentation allows the force measurement function to be isolated from parasitic force transmission paths.
2Ease of manufacture
If the holding element rests on the inner edge of the housing opening, then positioning is simpler, but deformation of the housing is transferred to the pressure sensor causing signal distortions
Solution Approach 1:
The pressure sensor support serves as an intermediary that decouples the holding element from direct contact with the housing opening edge. The holding element is positioned through the opening but supported by the pressure sensor support structure, which is integrated with the pressure sensor assembly rather than the housing itself.
Solution Approach 2:
The support function for the holding element is extracted from the housing structure and assigned to the pressure sensor support. This separates the positioning function from the structural housing, preventing housing deformation from being transmitted to the pressure sensor.
3Force
If the pressure sensor support is in direct contact with the contact portion, then force transmission is more direct, but parasitic forces from the holding element cannot be separated from the measurement
Solution Approach 1:
The pressure sensor support is segmented into distinct functional zones: one area for mounting the holding element and another for supporting the pressure sensor. This allows the support structure to handle both functions while maintaining separate force transmission paths, enabling the pressure sensor to measure only the plunger force without contamination from holding element parasitic forces.
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 design enhances the accuracy of pressure measurement within the syringe by reducing parasitic forces and maintaining signal integrity, enabling precise determination of the inner pressure through the analysis of electrical signals from the pressure sensor.
Implementation Method 1
The pressure sensor may comprise a strain gauge arranged at a surface of the pressure sensor support that faces away from the contact portion
Data Source
AI summary
The invention concerns a connection device for connecting a first reservoir with a second reservoir, havinga first section (11) for arranging the first reservoir (5) closed with a seal (51);a second section (12) for arranging the second reservoir; anda piercing element (2) which penetrates with a piercing end (21) the seal (51) of the first reservoir (5) when the first reservoir (5) is arranged at the first section (11).According to the invention, the piercing element (2) can be moved from a first position into a second position, wherein it blocks in the first position a flow connection between the first and the second section (11, 12), while in the second position it allows for a flow connection between the first and the second section (11, 12).