Syringe Needle Position Correction Using One-Dimensional Sensor
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Solution Overview
Problem
Existing methods for detecting and correcting syringe needle position and deviation in automatic intravenous medication preparation machines are costly, bulky, and time-consuming, often requiring complex measurement devices that hinder the precision and speed of the process.
Innovation Solution
A method using a robotic arm with a one-dimensional position sensor, such as a laser position sensor, to measure and correct the position and deviation of a syringe needle by positioning it in multiple calibrated stages, allowing for precise alignment and perpendicular insertion into containers without the need for extensive additional measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex measurement devices are used to detect needle position and deviation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential measurement function from complex optical measurement systems and implements it using a simple one-dimensional position sensor that detects only the x-coordinate. By taking out only the necessary measurement capability and eliminating unnecessary complex components, the system achieves adequate measurement precision while dramatically reducing device complexity and cost.
Solution Approach 2:
The patent creates a simplified measurement model that copies only the essential measurement function needed for needle position detection. Instead of using full three-dimensional optical measurement systems, it implements a one-dimensional position sensor that captures the critical x-coordinate information, providing a simplified copy of the measurement capability that suffices for the application.
2Manufacturing precision
If multiple measurement devices are used to correct needle position and deviation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the measurement and correction functions into a unified system. The one-dimensional position sensor measures needle position, and the control system simultaneously calculates both position correction and deviation correction values. This merging of functions eliminates the need for separate measurement devices for different correction types, achieving high manufacturing precision while keeping device complexity low.
Solution Approach 2:
The one-dimensional position sensor serves multiple functions: it detects needle position for position correction and provides data for calculating needle deviation for deviation correction. This multi-functional use of a single simple sensor achieves comprehensive measurement capabilities without requiring multiple specialized devices, thereby maintaining low device complexity while improving manufacturing precision.
3Measurement precision
If traditional measurement methods are used to detect needle deviation, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent performs preliminary measurement by detecting the needle position at an initial point before the needle reaches the container. This early measurement allows the control system to calculate both position and deviation corrections in advance, eliminating the need for time-consuming measurements at multiple points during the insertion process. The preliminary action maintains measurement precision while significantly reducing the time required.
Solution Approach 2:
The patent skips the traditional multi-point measurement sequence by using a single one-dimensional position sensor measurement at the initial needle position. This skipping of intermediate measurement steps, combined with mathematical calculations to derive deviation information, rushes through the measurement process while maintaining adequate precision for correction purposes.
4Volume of moving object
If compact machine design is implemented, then space utilization is improved, but device complexity increases due to constrained actuator movement
Solution Approach 1:
The patent implements a feedback mechanism where the one-dimensional position sensor continuously monitors needle position, and the control system uses this feedback to calculate real-time corrections for both position and deviation. This feedback loop enables the compact actuator to automatically adjust and compensate for its movement constraints, achieving accurate needle insertion despite the limited space and constrained movement paths in the compact machine design.
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 approach enables accurate and efficient needle alignment, reducing variability and the risk of collision, while maintaining a compact machine design, thus enhancing the speed and reliability of the medication preparation process.
Implementation Method 1
A method using a robotic arm with a one-dimensional position sensor, such as a laser position sensor, to measure and correct the position and deviation of a syringe needle
Data Source
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AI summary
Method for correcting the position and deviation of a syringe needle in a machine for automatically preparing intravenous medication, the machine comprising an automatic actuator, together with a control system, in which are placed the syringe and a one-dimensional position sensor comprising a measuring plane, the correction method comprising the steps in which the position sensor obtains position coordinates of a first and a second point of the needle, and steps of correcting the position and deviation error of the needle, by the control system of the automatic actuator.