Patient Bed Movement Control for Mass-Based Speed and Rocking Reduction
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Solution Overview
Problem
Conventional patient beds in medical imaging systems are moved without considering the patient's body value, leading to inefficient and potentially image-quality-degrading movements due to mass inertia and rocking, which can be exacerbated by changes in direction.
Innovation Solution
A method and system that adjusts the operating parameters of the patient bed's drive chain based on the patient's body value, such as mass and stature, to increase speed while suppressing rocking, using a digital twin to simulate and model the patient-bed interaction, allowing for individualized and condition-dependent movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the patient bed is moved at a fixed maximum speed determined for a maximum mass value, then the device can handle the heaviest patients, but the movement speed is unnecessarily low for lighter patients, reducing productivity
Solution Approach 1:
The patent applies dynamics by making the bed movement speed variable rather than fixed. The control system dynamically adjusts the movement speed based on the actual patient mass detected by the weighing device. Lighter patients receive higher speeds to improve throughput, while heavier patients receive appropriately reduced speeds to maintain safety and comfort, thus resolving the contradiction between productivity and speed.
Solution Approach 2:
The patent changes the operating parameter (movement speed) based on the patient's body mass. By using the weighing device to determine actual mass and adjusting the speed parameter accordingly, the system optimizes throughput for lighter patients while maintaining safe operation for heavier patients, resolving the contradiction between fixed maximum speed and variable productivity needs.
2Productivity
If the patient bed is moved quickly to increase productivity, then examination duration is reduced, but rocking and vibration occur that degrade image quality
Solution Approach 1:
The patent changes multiple operating parameters simultaneously - not only speed but also acceleration and deceleration rates - based on patient mass. This coordinated parameter adjustment allows faster movement for lighter patients while maintaining image quality, and appropriately scaled parameters for heavier patients, resolving the contradiction between productivity and image quality.
Solution Approach 2:
The patent uses feedback from the weighing device to continuously monitor patient mass and adjust movement parameters in real-time. This closed-loop control ensures that the bed movement is optimized for each patient's mass, achieving high productivity while preventing rocking and vibration that would degrade image quality.
3Productivity
If the bed movement parameters are optimized for lighter patients, then productivity increases, but the bed may become unstable when carrying heavier patients
Solution Approach 1:
The patent dynamically changes movement parameters (speed, acceleration, deceleration) based on the detected patient mass. For lighter patients, higher speeds and accelerations improve productivity, while for heavier patients, reduced parameters maintain bed stability and safety, thus resolving the contradiction between productivity and stability.
4Device complexity
If conventional fixed speed movement is used, then the drive chain is simple to control, but it causes rocking during direction changes that degrades imaging
Solution Approach 1:
The patent changes operating parameters (speed, acceleration, deceleration) based on patient mass and movement phase. During direction changes, the system adjusts parameters to minimize rocking, improving image quality while maintaining reasonable control complexity through automated mass-based parameter selection.
Solution Approach 2:
The patent implements feedback control where the weighing device provides continuous mass information to the control system, which automatically adjusts movement parameters to prevent rocking during direction changes. This automated feedback mechanism improves image quality without significantly increasing control complexity.
Data Source
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AI summary
The invention relates to a method for moving a patient bed depending on a body value of a patient lying on the patient bed for medical imaging, the associated patient bed and the associated computer program product.The inventive method for moving a patient bed depending on a body value of a patient positioned on the patient bed for medical imaging, wherein the medical imaging is performed in an imaging modality with an acquisition area, and wherein the patient bed is movable within the acquisition area by means of a drive chain, comprises the following steps: - providing a body value, in particular a mass and/or a stature, of the patient, - setting an operating parameter of the drive chain by means of a control unit for controlling the drive chain depending on the body value such that a speed value of the patient bed is increased and a rocking motion of the patient bed during movement is at least partially suppressed, and - moving the patient bed by means of the drive chain according to the increased speed value to perform the medical imaging.