Operating Table Sensor Layout for Real-Time Patient Posture Detection
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Solution Overview
Problem
During surgical interventions, patients under anesthesia cannot express discomfort due to posture, leading to risks of decubitus ulcers, joint pain, and potential falls or tilting of the operating table.
Innovation Solution
An operating table equipped with sensors that detect physical characteristics of a patient's body, such as weight and conductivity, to assess posture and potential risks, using pressure and capacitive proximity sensors integrated in flexible pads, connected to an evaluation unit for real-time monitoring and warning signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressure sensor is used to detect patient presence, then the device complexity is reduced, but the measurement precision and reliability of posture detection deteriorates
Solution Approach 1:
The detection system is segmented into multiple independent sensor types (pressure sensor, capacitive proximity sensor, and additional pressure sensors at different locations) rather than using a single sensor. Each sensor detects specific physical characteristics at different positions, and the evaluation unit integrates these segmented measurements to achieve comprehensive posture detection with high precision while maintaining manageable system complexity through modular sensor placement.
Solution Approach 2:
The sensor system is designed with multi-functionality where pressure sensors serve dual purposes: detecting patient presence and measuring pressure distribution for posture assessment. The capacitive proximity sensor complements this by detecting body parts not in direct contact with the lying surface. This universal approach allows a single integrated sensor system to perform multiple detection functions, improving measurement precision without proportionally increasing device complexity.
2Manufacturing precision
If rigid sensor structures are used, then the manufacturing precision is improved, but the contact conditions with patient's body deteriorate causing tissue damage
Solution Approach 1:
The sensor system employs flexible sensor elements and thin film structures that can conform to the patient's body contours while maintaining manufacturing precision. The flexible pads and soft sensor substrates allow the rigidly-fabricated sensors to adapt to curved body surfaces without creating pressure points or causing tissue damage, thus resolving the contradiction between manufacturing precision and biocompatibility.
Solution Approach 2:
The sensor construction utilizes composite materials combining rigid sensor components with flexible substrates and soft protective layers. This composite structure allows precise sensor fabrication while the flexible and soft materials ensure gentle contact with the patient's body, preventing tissue damage. The composite approach integrates the advantages of both rigid precision and flexible comfort.
3Measurement precision
If sensors are placed at all possible locations to detect all body parts, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Instead of uniformly distributing sensors throughout the entire table surface, the system applies local quality by placing sensors strategically at specific locations where they provide maximum detection value. Pressure sensors are positioned at critical areas for detecting decubitus risk zones, while capacitive proximity sensors are placed to detect body parts not in contact with the surface. This localized sensor placement achieves high measurement precision for posture detection while minimizing the total number of sensors and reducing device complexity.
Solution Approach 2:
The evaluation unit serves as an intermediary that processes and integrates data from multiple sensor types and locations. Rather than requiring direct physical proximity between all sensors and body parts, the evaluation unit mediates by receiving signals from distributed sensors and computationally determining posture and risk assessment. This intermediary processing allows the system to achieve comprehensive detection with fewer physical sensors, reducing device complexity while maintaining high measurement precision.
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
Enables early detection and prevention of decubitus ulcers, joint pain, and table tilting, enhancing patient safety and surgical efficiency by providing real-time posture assessment and warning signals.
Implementation Method 1
By detecting the pressure onto the tabletop by means of the pressure sensor
Implementation Method 2
another kind of the sensors may comprise a capacitive proximity sensor... a change in distance of the body part may be detected
Data Source
AI summary
An operating table comprises a tabletop having a lying surface, and a plurality of sensors respectively configured to detect presence of a part of a patient's body on the tabletop above the respective sensor, wherein the sensors are configured to detect different physical characteristics of the part of the patient's body in order to determine the posture of the part of the patient's body or of the patient's body.