Headrest Motion Control for Stable Stereoscopic Viewing Alignment
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Solution Overview
Problem
In robotic and medical systems, operator head movements can cause misalignment between the eyes and the display unit, degrading visual feedback, especially in stereoscopic viewing, and leading to ergonomic issues and operator fatigue.
Innovation Solution
A computer-assisted medical system with a headrest and sensor interface that processes mechanical inputs from the operator's head to drive a virtual mass, simulating movement and compensating for head movements, thereby maintaining alignment between the operator's eyes and the display unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display unit is fixed in position, then the system structure is simple and stable, but operator head movements cause misalignment between eyes and display unit, degrading visual feedback
Solution Approach 1:
The system uses the operator's own head movements as the control input signal. The headrest sensor detects mechanical input from the operator's head, and this input directly drives the virtual mass to simulate head movement, which then controls the imaging device. This self-service approach eliminates the need for external control devices while maintaining alignment between the operator's eyes and the display unit.
Solution Approach 2:
The patent replaces direct mechanical coupling between the operator's head and the control system with a sensor-based detection system. The headrest sensor interfacing with the headrest converts mechanical head movements into sensor signals, which are then processed to drive the virtual mass. This substitution allows for more precise control and maintains visual alignment without rigid mechanical connections.
2Ease of operation
If the display unit moves to track head movements, then visual alignment is maintained, but the system becomes more complex with additional sensors and control mechanisms
Solution Approach 1:
The headrest serves multiple functions: it provides physical support for the operator's head and simultaneously acts as a sensor interface for detecting head movements. By integrating these two functions into a single component, the system reduces overall complexity while maintaining operator comfort and visual alignment.
Solution Approach 2:
The virtual mass acts as an intermediary between the headrest sensor and the imaging device control system. The sensor signals drive the virtual mass to simulate head movement, and this simulated movement then controls the imaging device. This intermediary layer simplifies the control architecture by decoupling the sensor input from the device control while maintaining the desired functionality.
3Measurement precision
If headrest sensitivity is increased to detect subtle head movements, then control precision is improved, but operator fatigue increases due to excessive system responsiveness
Solution Approach 1:
The system uses partial action by processing only the relevant components of headrest sensor signals. Rather than responding to all detected movements equally, the system selectively processes signals that correspond to meaningful control inputs, filtering out excessive or irrelevant movements. This approach maintains detection precision while preventing over-responsiveness that would cause operator fatigue.
Data Source
AI summary
A computer-assisted medical system includes a display unit configured to provide images to an operator of the display unit, a headrest configured to receive a mechanical input provided by a head of the operator in mechanical contact with the headrest, a headrest sensor interfacing with the headrest and configured to provide sensor signals based on the mechanical input, and a controller. The controller includes a computer processor, and is configured to process the sensor signals to obtain a driving input, drive, by the driving input, a virtual mass to obtain a simulated virtual mass movement, and cause movement of the headrest, the movement of the headrest tracking the virtual mass movement.