Teleoperational State Entry and Exit Using Head-Directed Display Detection
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Solution Overview
Problem
Existing teleoperational systems lack reliable mechanisms to determine when a teleoperational instrument should be responsive to operator movement, particularly in scenarios where the operator's attention is diverted from the display, posing safety risks during minimally invasive medical procedures.
Innovation Solution
A teleoperational medical system that includes a processing unit to determine if the operator's head is directed toward a display region, initiating an operator following mode only when the operator's head is correctly positioned, ensuring safe and controlled instrument movement based on controller inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the teleoperational system allows instrument movement based on controller inputs, then operational responsiveness is improved, but safety deteriorates when the operator looks away from the display
Solution Approach 1:
The system continuously monitors the operator's head position and gaze direction through sensors (cameras, accelerometers, gyroscopes) and uses this feedback to dynamically control instrument responsiveness. When the operator's head is directed toward the display, the system enables instrument movement; when the head turns away, the system automatically suspends movement, creating a closed-loop safety mechanism that resolves the contradiction between responsiveness and safety
Solution Approach 2:
The teleoperational system transitions between different operational states (responsive vs. suspended) based on real-time operator attention status. The system dynamically adjusts its control mode: in the responsive state, instrument movement follows controller inputs; in the suspended state, movement is blocked regardless of controller inputs. This dynamic state change resolves the contradiction by making safety conditional on operator attention
2Reliability
If the system monitors operator head position to ensure safety, then safety is improved, but device complexity increases
Solution Approach 1:
The system introduces intermediary components (head-mounted sensors, gaze detection cameras, processing algorithms) that mediate between the operator's natural head movements and the teleoperational control system. These intermediaries translate physical head position into digital signals that the control system can process, enabling safety monitoring without requiring direct integration of complex monitoring infrastructure into the core teleoperational mechanism
Solution Approach 2:
The head tracking and gaze detection system serves multiple functions: it determines operator attention status for safety control, provides spatial orientation data for potential ergonomic improvements, and could potentially enable future features like voice-activated controls or automated documentation. This multi-functionality justifies the added complexity by extracting multiple benefits from a single sensor suite
Data Source
AI summary
A teleoperational system comprises a teleoperational control system and a teleoperational manipulator configured for operating an instrument in an environment. The teleoperational system also comprises an operator controller in communication with the teleoperational control system. The teleoperational control system includes a processing unit including one or more processors. The processing unit is configured to determine whether an operator of the operator controller has a head portion directed toward a display region of a display device and based on a determination that the operator's head portion is directed toward the display region, initiate an operator following mode in which movement of the operator controller provides a corresponding movement to the teleoperational manipulator. The teleoperational system may be a teleoperational medical system.