Impedance Pneumography Electrode Insulation for Lung Volume Linearity
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Solution Overview
Problem
Impedance pneumography's clinical applications are limited due to nonlinearity between thoracic impedance change and lung volume change, especially at low lung volumes, which affects the accuracy of pulmonary flow parameter measurement and restricts its use beyond respiratory rate monitoring.
Innovation Solution
The method involves positioning electrodes on the arms and torso to prevent skin contact, using insulation materials like sleeves or shirts to improve linearity, and employing a processor-based apparatus for accurate impedance pneumography measurements, enhancing the ΔZ/ΔV ratio over the complete lung volume range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are placed on the arms and torso with insulation material to prevent skin contact, then linearity of lung volume measurement is improved, but device complexity increases
Solution Approach 1:
The patent introduces insulation material as an intermediary element positioned between the arm and torso to prevent direct skin contact. This mediator ensures that electrical current follows the intended path through the lung tissue, improving measurement linearity while maintaining patient comfort and safety
Solution Approach 2:
The patent applies different materials and configurations to different regions: conductive electrodes are placed on the arms, while insulation material is strategically positioned at the torso interface. This local differentiation optimizes both signal quality and measurement accuracy without requiring complete redesign of the entire device
2Adaptability or versatility
If impedance pneumography is used for pulmonary flow parameter measurement, then measurement capability is improved, but measurement precision deteriorates at low lung volumes
Solution Approach 1:
The patent implements preliminary positioning of electrodes and insulation material before measurement begins, ensuring optimal current path configuration from the start. This preliminary setup prevents signal degradation that would occur during actual measurement, particularly at low lung volumes where signal margins are minimal
Solution Approach 2:
The patent modifies the electrical measurement parameters by changing the current path configuration through strategic electrode placement and insulation positioning. This parameter change ensures consistent current flow through the lungs across the entire volume range, improving precision at low volumes without sacrificing versatility
3Measurement precision
If skin contact is prevented using insulation material, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent integrates the insulation material within the existing device structure, nesting it between the electrode components and the patient's body. This nested configuration eliminates the need for separate insulation application steps, maintaining measurement accuracy while preserving ease of operation through streamlined device architecture
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
This approach improves the linearity of lung volume measurements, especially at low volumes, enabling more accurate detection of phenomena and expanding the clinical applicability of impedance pneumography, including pediatric use by ensuring patient comfort and non-invasiveness.
Implementation Method 1
a small high frequency current is passed through a pair of skin electrodes and another pair of electrodes is used to record the generated voltage that is proportional to the impedance (Z)
Implementation Method 2
the skin contact between the arm and the torso is prevented by an insulation material configured to be positioned between the arm and the torso
Data Source
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Figure 5~6
AI summary
A method, a sensor arrangement, an apparatus and a computer program product for measuring a change in lung volume, comprising measuring a parameter for impedance pneumography by using at least one electrode (11) configured to be in contact with an arm (2) of a human body (1) and at least one electrode (22) configured to be in skin contact with thorax of a human body (1).