Skin Contact Detection via Electrical Resistance in Medical Sensors
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Solution Overview
Problem
Measuring devices placed on the skin surface may become detached, leading to unreliable measurements, particularly in critical applications like monitoring newborn body temperature in incubators, where erroneous readings can result in unnecessary temperature adjustments.
Innovation Solution
A measuring device with at least one sensor and two contact surfaces on its underside, which detect a measuring current based on electric resistance between them, ensuring sufficient skin contact is maintained by generating a contact signal that indicates reliable contact, and includes features like a grid or labyrinthine contact surface arrangement to avoid false alarms and a local power source for display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a measuring device is placed on the skin surface to measure bodily functions, then measurement capability is achieved, but the device may become detached leading to unreliable measurements
Solution Approach 1:
The patent replaces mechanical contact verification with an electrical detection system. Two contact surfaces with different electrical potentials are used to generate a measuring current that indicates skin contact status. This electrical field-based detection substitutes for mechanical attachment verification, enabling reliable detection of contact status without adding complex mechanical structures.
Solution Approach 2:
The patent introduces an intermediary electrical detection system between the measuring device and the skin surface. The two contact surfaces act as intermediaries that mediate the contact status information, converting physical contact into an electrical signal that can be detected and used to verify proper device placement.
2Reliability
If simple optical appearance is used to check contact status, then ease of operation is maintained, but insufficient contact cannot be reliably detected
Solution Approach 1:
The patent replaces visual/optical inspection with electrical detection. Instead of relying on optical appearance to assess contact status, the system uses electrical current measurement between two contact surfaces to objectively determine whether sufficient skin contact is maintained, providing reliable detection without complicating operation.
Solution Approach 2:
The measuring device performs self-verification of its contact status through the electrical detection system. The device automatically monitors its own attachment to the skin surface by measuring the current between its two contact surfaces, eliminating the need for external verification and maintaining operational simplicity.
3Reliability
If erroneous measured values are not detected, then productivity is maintained, but patient safety is compromised due to unnecessary temperature adjustments
Solution Approach 1:
The patent implements a feedback mechanism where the measuring current status is continuously monitored and used to verify the validity of temperature measurements. When the measuring current falls below a threshold indicating insufficient contact, the system provides feedback to reject or flag the measured value, preventing erroneous data from triggering unnecessary temperature adjustments in the incubator.
Solution Approach 2:
The patent performs preliminary verification of contact status before accepting measurement data. By checking the measuring current between contact surfaces prior to using the temperature measurement, the system ensures data validity in advance, preventing downstream errors and unnecessary operational changes while maintaining efficient operation.
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
Ensures immediate and unambiguous detection of insufficient skin contact, enhancing the reliability of measured values and patient safety by preventing erroneous temperature adjustments and providing timely countermeasures.
Implementation Method 1
detecting a measuring current resulting from a respective effective electric resistance (prevailing/active electric resistance) between the at least one first and second contact surfaces
Data Source
AI summary
A measuring device (10) has at least one sensor (16, 18), which can be applied to the skin surface (12) of a patient for detecting a measured value with the sensor (16, 18). The device (10) has two contact surfaces (20, 22) on an underside (24), which is intended for being in contact with the skin surface (12) of the patient. A current detecting (32, 34), detects a measuring current (30) resulting from a particular effective electric resistance between the contact surfaces (20, 22). A method for operating such a measuring device (10) and a system with such a measuring device (10) are also provided.