Cannula Rotation Detection via Shadow Profile
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Solution Overview
Problem
Existing detection devices for lancing cannulas require the conveyor belt to stop, leading to delays and inability to determine both position and rotation angle simultaneously, limiting manufacturing efficiency and precision in orientation.
Innovation Solution
A detection device with a recording system that captures the shadow profile of the lancing cannula's ground surface during continuous transport, using electromagnetic radiation and high-speed cameras to determine position and rotation angle relative to a zero position within a quadrant coordinate system, allowing for simultaneous and precise detection without stopping the conveyor belt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conveyor belt is stopped to measure the position of the cannula, then the position can be determined accurately, but the manufacturing process is delayed and transport speed is reduced
Solution Approach 1:
The system performs preliminary positioning and measurement actions during the transport phase itself, rather than requiring a separate stationary measurement phase. The linear encoder continuously tracks position during movement, and the shadow profile measurement is synchronized with the transport motion, allowing position to be determined accurately without stopping the conveyor belt.
Solution Approach 2:
The measurement process is made continuous by synchronizing the shadow profile capture with the continuous transport of the cannula. The linear encoder provides continuous position feedback during transport, and the recording element captures the shadow profile at the appropriate moment during motion, eliminating idle stopping time while maintaining measurement accuracy.
2Measurement precision
If complex sensors are used to determine position, then measurement accuracy can be achieved, but device complexity and cost increase
Solution Approach 1:
Instead of using complex physical sensors to directly measure position and orientation, the system creates an optical copy (shadow profile) of the cannula's beveled edge and processes this image data to determine both position and rotation angle. The linear encoder provides a simplified positional reference, and the shadow profile serves as an optical replica that contains all necessary geometric information for precise measurement without requiring complex sensor assemblies.
Solution Approach 2:
The system replaces complex mechanical position and angle sensors with an optical measurement approach. A recording element (camera) captures the shadow profile, and image processing algorithms extract position and rotation angle information, substituting mechanical sensing with optical-field measurement that is inherently less complex and more cost-effective.
3Measurement precision
If the conveyor belt is stopped for detection, then precise measurement can be performed, but detection time increases and manufacturing efficiency decreases
Solution Approach 1:
The system prepares the measurement conditions in advance by positioning the recording element and synchronizing its operation with the transport cycle. The linear encoder continuously maintains positional reference, so when the cannula passes through the measurement zone, the shadow profile can be captured immediately during transport without requiring prior stopping or setup time.
Solution Approach 2:
The measurement process is integrated into the continuous transport flow. The recording element captures the shadow profile while the cannula is in motion, and the linear encoder provides continuous positional reference throughout. This eliminates the time loss associated with stopping the conveyor belt for measurement, as the useful action of measurement occurs continuously during the transport phase.
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 fast and cost-effective detection of both position and rotation angle, significantly reducing detection time and improving manufacturing throughput while ensuring precise orientation of lancing cannulas, such as in syringe systems.
Implementation Method 1
whereby a shadow profile of the beveled surface generated by the light source strikes the receiving system and can be detected optically and/or electronically by it
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The invention relates to a detection device (100) for detecting rotation angles of at least one piercing cannula (1), comprising a needle carrier transport system (2) for transporting the piercing cannula (1) along a transport direction (3); at least one receiving system (4) for receiving and determining a position and/or a rotation angle of a bevel surface (11) of the piercing cannula (1) with respect to a zero position (N0) within a quadrant coordinate system (Q1-Q4);a transport device (5), wherein the needle carrier transport system (2) is transportable along the transport direction (3) on the transport device (5), and electromagnetic radiation can be directed onto the piercing cannula (1) by means of at least one light source (6), wherein a shadow profile of the polished surface (1) generated by the light source (6) strikes the receiving system (4) and can be detected optically and/or electronically by it, wherein the receiving system (4) comprises at least one receiving element (41) which detects the shadow profile of the polished surface (11) generated by the polished surface (11) during a position determination sequence and during continuous transport of the piercing cannula (1), and the receiving system (4) can determine the position and/or the rotation angle of the polished surface (11) relative to the zero position (N0) from the detected shadow profile.