Jaw Position Detection via Arc-to-Linear Conversion
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Solution Overview
Problem
Existing jaw position detection systems in medical accelerator treatment heads suffer from low detection accuracy and chip damage due to X-ray irradiation, as they rely on encoders with chips that are not resistant to radiation and are prone to interference.
Innovation Solution
A jaw position detection apparatus that converts the arcuate motion of the jaw into linear motion using a connecting component and displacement sensor, where the displacement sensor, such as a sliding resistor, detects the linear motion without being exposed to X-ray irradiation, ensuring high accuracy and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encoder with chip is used to detect jaw position, then the jaw position can be detected, but the chip is damaged due to X-ray irradiation and detection accuracy is reduced
Solution Approach 1:
A conversion mechanism is introduced as an intermediary between the jaw and the displacement sensor. This mechanism converts the arcuate motion of the jaw into linear motion that the displacement sensor can detect, allowing the sensor to be positioned away from the X-ray path while still accurately measuring jaw position
Solution Approach 2:
The patent replaces the encoder's chip-based electronic detection system with a mechanical conversion system combined with a displacement sensor. The conversion mechanism mechanically transforms the arc motion into linear motion, substituting the need for radiation-sensitive electronic chips with a mechanical-transmission-based detection approach
2Measurement precision
If the displacement sensor is placed in the X-ray path to detect jaw position, then detection can be performed, but the sensor is damaged by X-ray irradiation
Solution Approach 1:
The conversion mechanism serves as a mediator that transmits motion information from the jaw to the displacement sensor without requiring the sensor to be in the X-ray path. The linear motion generated by the conversion mechanism can be detected by the sensor while the sensor remains protected from direct X-ray exposure
Solution Approach 2:
The detection system is segmented into two separate functional components: the conversion mechanism that handles the motion transformation and the displacement sensor that handles the detection. This segmentation allows each component to be optimized for its specific function and positioned to avoid X-ray damage
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 system effectively detects the position of the jaw with high accuracy and resilience to X-ray irradiation, reducing the risk of damage and improving operational reliability.
Implementation Method 1
The conversion mechanism is configured to convert an arcuate motion of the connecting component into a linear motion when the connecting component moves in an arc with the jaw
Implementation Method 2
A basic principle of the displacement sensor is a sliding resistor
Data Source
AI summary
A jaw position detection apparatus is configured to detect position information of at least one jaw moving in an arc, and includes a connecting component, a conversion mechanism, and a displacement sensor. The connecting component is fixed on a jaw. The conversion mechanism is connected to the connecting component, and the conversion mechanism is configured to convert an arc motion of the connecting component into a linear motion when the connecting component moves in an arc with the jaw. The displacement sensor is connected to the conversion mechanism, and configured to detect displacement information of the linear motion of the conversion mechanism.