Blood Flow Restriction Cuff with Doppler Ultrasound Monitoring
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Solution Overview
Problem
Current blood flow restriction systems fail to provide direct and complete measurements of microvascular blood flow, leading to incomplete and indirect assessments of the effects of pressure and exercise on target muscles, which can result in safety issues such as over-compression, thrombosis, hypoxic-ischemic injury, and embolic ischemia.
Innovation Solution
A blood flow restriction system that measures and monitors microvascular blood flow non-invasively within the target muscle using techniques like diffuse correlation spectroscopy, near-infrared spectroscopy, and speckle contrast optical spectroscopy to guide safety and performance parameters, allowing for real-time adjustments of cuff pressure based on hemodynamic criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulse oximetry or PPG is used to measure physiological variables, then the system can estimate limb occlusion pressure, but the measurement precision is insufficient and provides only indirect and incomplete measurements of microvascular blood flow
Solution Approach 1:
The patent replaces optical measurement systems (pulse oximetry, PPG) with acoustic measurement systems (Doppler ultrasound) to detect blood flow. The Doppler ultrasound system uses acoustic waves to measure blood flow velocity and direction, providing direct measurement of microvascular blood flow rather than indirect optical estimates, thereby improving measurement precision and reducing information loss.
Solution Approach 2:
The patent introduces Doppler ultrasound as an intermediary measurement method between the cuff pressure application and the target muscle blood flow. The Doppler probe acts as an intermediary that directly detects blood flow dynamics in the target muscle, providing accurate real-time information about microvascular hemodynamics without the limitations of optical methods.
2Adaptability or versatility
If cuff pressure is pre-determined as a percent of arterial occlusion pressure, then the exercise regimen can be standardized, but safety issues arise from over-compression and inability to monitor actual blood flow effects
Solution Approach 1:
The patent implements a feedback control system where Doppler ultrasound measurements of blood flow are continuously monitored and fed back to the control system. Based on this real-time feedback, the system automatically adjusts cuff pressure to maintain optimal blood flow restriction levels, preventing over-compression and ensuring safety while adapting to individual physiological responses.
Solution Approach 2:
The patent transitions from static pre-determined cuff pressure values to dynamic, real-time pressure adjustment. The system continuously monitors blood flow using Doppler ultrasound and dynamically modifies cuff pressure throughout the exercise regimen, allowing adaptation to changing physiological conditions and maintaining safety throughout the exercise period.
3Device complexity
If indirect measurement methods are used, then the system complexity is reduced, but complete information about microvascular hemodynamics and muscle health is not obtained
Solution Approach 1:
The patent replaces complex multi-sensor optical measurement systems with a focused acoustic measurement approach. By using Doppler ultrasound specifically targeted at the microvascular bed, the system achieves complete information about blood flow dynamics with appropriate device complexity, avoiding the information loss associated with indirect optical methods.
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
The system effectively reduces the risk of adverse events by providing personalized and precise control over blood flow restriction, enhancing the safety and efficacy of the exercise regimen while minimizing damage to muscles and vessels.
Implementation Method 1
measuring and monitoring means to measure and monitor microvascular blood flow within at least the target muscle
Implementation Method 2
using techniques like diffuse correlation spectroscopy, near-infrared spectroscopy, and speckle contrast optical spectroscopy
Implementation Method 3
using techniques like diffuse correlation spectroscopy, near-infrared spectroscopy, and speckle contrast optical spectroscopy
Data Source
AI summary
The present invention relates to a blood flow restriction system, comprising: —a tourniquet cuff (C) or band to be placed around a limb, proximally to a target muscle, tightened so as to apply a specific pressure during a blood flow restriction exercise regimen; and —measuring and monitoring means (M, P) made and arranged to measure and monitor microvascular blood flow within the target muscle, to guide safety and performance parameters of the blood flow restriction exercise regimen according to hemodynamic criteria. The present invention also relates to a method adapted to use the system of the invention, and to a computer program with code instructions to implement the steps of the method of the invention.