Medical Pressure Sensor Damping for Acoustic Resonance Control
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Solution Overview
Problem
Medical pressure measuring devices often provide inaccurate readings due to acoustic resonance effects when measuring fluid pressure at a point distant from the sampling point, especially in breathing apparatuses, where space constraints and contamination risks hinder direct measurement.
Innovation Solution
A medical pressure measuring device with a pressure sensor and a damping arrangement, including a flow restrictor and a receptor chamber, is used to connect the measurement point and sampling point, correlating the flow restrictor's resistance and receptor chamber's volume to the acoustic impedance and volume of the pressure sampling tube to prevent acoustic resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pressure sensor is placed at a distance from the sampling point to avoid contamination and space constraints, then the measurement location becomes more flexible and contamination risk is reduced, but acoustic resonance occurs in the pressure sampling tube causing measurement errors
Solution Approach 1:
A damping arrangement is introduced as an intermediary component between the sampling point and the pressure sensor. This damping arrangement includes a damping element that selectively attenuates acoustic resonance in the pressure sampling tube while allowing the pressure signal to pass through, thereby enabling accurate measurements at remote locations without contamination risk
Solution Approach 2:
The acoustic resonance phenomenon, which initially causes measurement errors, is converted into a beneficial effect by using a damping element that exploits acoustic impedance matching. The damping element is designed to absorb the resonant energy from acoustic waves, transforming the harmful resonance into a controlled damping effect that improves measurement accuracy
2Measurement precision
If the pressure sensor is placed close to the sampling point to ensure accurate pressure measurement, then measurement precision is improved, but the device occupies valuable space and contamination risk increases
Solution Approach 1:
The damping arrangement serves as a mediator that allows the pressure sensor to be positioned at a distance from the sampling point while maintaining measurement accuracy. The damping element in the pressure sampling tube compensates for the acoustic resonance effects that would otherwise cause errors at remote measurement locations
Solution Approach 2:
The patent replaces the need for direct mechanical proximity between the sensor and sampling point with an acoustic field-based solution. By using acoustic impedance matching and damping elements in the pressure sampling tube, the system substitutes mechanical closeness with acoustic field control, allowing remote measurement without loss of 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
This configuration ensures accurate pressure measurements by minimizing the impact of acoustic resonance, allowing the pressure sensor to measure values that correspond to the sampling point, even when located at a distance, thereby enhancing measurement reliability.
Implementation Method 1
physical effects can cause the medical pressure measuring device to show a value for the fluid pressure at the measurement point that differs from the pressure of the fluid at the sampling point. It has turned out that this source of measuring error can be caused by a phenomenon called acoustic resonance
Implementation Method 2
the pressure sampling tube has a sampling tube volume and an acoustic impedance. The flow restrictor correlates to the acoustic impedance of the pressure sampling tube, so as to prevent acoustic resonance in the pressure sampling tube
Data Source
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Figure 3
Figure 4a~4b
AI summary
The present disclosure relates to a medical pressure measuring device (100) for measuring a pressure of a pressurized breathing gas supplied to a subject by a breathing apparatus (200). The device (100) comprises a pressure sensor (110) arranged at a point of measurement (195) and configured to measure the pressure of a sample gas at a sampling point (190).The sampling point (190) and the point of measurement (195) are connected by a pressure sampling tube (180) in which a pressure wave of the sample gas can propagate from the sampling point (190) to the point of measurement (195).The pressure sampling tube (180) has a sampling tube volume and an acoustic impedance. The medical pressure measuring device (100)further comprises a damping arrangement (120) arranged to be brought into fluid communication with the pressure sampling tube (180).The damping arrangement (120) comprises a flow restrictor (130) and a receptor chamber arrangement (140). The receptor chamber arrangement (140)comprises a receptor chamber (141). The receptor chamber arrangement (140)is an arrangement for receiving the pressure wave of the sample gas. The flow restrictor (130) correlates to the acoustic impedance of the pressure sampling tube (180) so as to prevent acoustic resonance in the pressure sampling tube (180). The receptor chamber (141) correlates at least to the volume of the pressure sampling tube (180), so as to prevent acoustic resonance in the pressure sampling tube (180).