Dual-Crystal Doppler Probe Angle Correction for Blood Flow Velocity
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Solution Overview
Problem
Existing Doppler blood flow detection devices suffer from measurement errors due to inconsistencies between the probe angle and the blood vessel angle, especially when the patient moves during long-term monitoring, leading to inaccurate blood flow velocity readings.
Innovation Solution
A Doppler blood flow detection device utilizing a dual crystal unit group, where two crystal units are placed at different positions on the blood vessel to collect Doppler angles, allowing for the adjustment and correction of spectrum waveforms to determine an accurate blood flow velocity measurement by calculating the deviation angle and applying correction factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single crystal unit is used for Doppler detection, then the device structure is simple, but the measurement precision deteriorates due to angle inconsistency between probe and blood vessel
Solution Approach 1:
The probe is divided into multiple crystal units (at least two) arranged at different positions and angles. Each crystal unit independently detects Doppler signals from the blood vessel, allowing the system to capture angle information from multiple perspectives simultaneously, thereby resolving the angle inconsistency problem without overcomplicating the overall device structure.
Solution Approach 2:
The patent transitions from single-point detection to multi-point spatial detection by arranging crystal units at different positions and angles. This dimensional expansion in the detection space enables the system to acquire angular information and perform angle correction, improving measurement precision while maintaining reasonable device complexity.
2Ease of operation
If the probe angle does not match the set Doppler angle, then the detection process is simple, but the measurement precision deteriorates due to angle deviation
Solution Approach 1:
The system uses multiple crystal units to detect actual angle information during the detection process. This angle information serves as feedback that is processed to calculate correction factors, which are then applied to adjust the blood flow velocity measurements, ensuring accuracy even when the probe angle deviates from the set Doppler angle.
Solution Approach 2:
The patent dynamically adjusts measurement parameters by calculating correction factors based on detected angle information. These correction factors modify the relationship between Doppler frequency shift and blood flow velocity, allowing the system to maintain measurement precision despite variations in probe positioning and angle.
3Duration of action of moving object
If patient movement occurs during long-term monitoring, then the monitoring duration is extended, but the measurement precision deteriorates due to changing probe-blood vessel angle
Solution Approach 1:
The system pre-calculates correction factors based on initial angle detection using multiple crystal units. These correction factors are stored and applied during subsequent measurements, allowing the system to maintain measurement precision throughout long-term monitoring even as patient position changes, without requiring continuous real-time angle adjustment.
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 method significantly reduces measurement errors by aligning the actual Doppler angle with the set angle, resulting in a more accurate blood flow velocity measurement value.
Implementation Method 1
the Doppler frequency shift may occur to the scattered echo signal. The greater the velocity is, the greater the frequency shifts
Implementation Method 2
scattering may be occured when the ultrasonic wave meets red blood cells in the blood since the wavelength of the ultrasonic wave is greater than the diameter of the red blood cell
Data Source
Figure 1~2
Figure 3~4(d)
Figure 5~6(c)
AI summary
The embodiment of the present disclosure relates to a method for determining blood flow velocity using a dual crystal unit group and a Doppler blood flow detection device. The device includes a first crystal unit group and a second crystal unit group placed at different positions of a blood vessel to be detected. The method includes obtaining a first spectrum waveform by detecting the blood vessel to be detected using the first crystal unit group, obtaining a second spectrum waveform by detecting the blood vessel to be detected using the second crystal unit group, determining a relationship between an actual Doppler angle during detection and a set Doppler angle in the Doppler blood flow detection device according to the first spectrum waveform and the second spectrum waveform, adjusting the first spectrum waveform and the second spectrum waveform according to the determined relationship, and determining a blood flow velocity measurement value based on the adjusted first spectrum waveform and the adjusted second spectrum waveform.