Blood Flow Restrictive Cuff with Integrated PPG Sensor
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Solution Overview
Problem
Current systems for blood flow restrictive therapy lack effective monitoring capabilities to accurately measure and control blood flow through limbs during therapy sessions.
Innovation Solution
A cuff system equipped with a blood flow sensor, such as a photoplethysmography (PPG) sensor, and a controller that adjusts the source of positive pressure to restrict blood flow, allowing for continuous monitoring and adjustment of blood flow levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cuff system is used to restrict blood flow during therapy, then blood flow restriction is achieved, but there is no effective monitoring capability to measure and control blood flow levels
Solution Approach 1:
The patent combines the blood flow sensor (PPG sensor with LED and photodiode) directly into the cuff structure, merging the monitoring function with the existing blood flow restriction device. This integration allows blood flow measurement without requiring a completely separate monitoring system, thereby improving measurement capability while controlling the increase in device complexity.
Solution Approach 2:
The cuff system is designed to perform multiple functions: restricting blood flow through the bladder and simultaneously monitoring blood flow levels through the integrated sensor. This multi-functionality eliminates the need for separate devices and enables comprehensive blood flow management in a single system.
2Ease of operation
If manual adjustment of positive pressure is used, then system simplicity is maintained, but precise control and continuous monitoring of blood flow levels cannot be achieved
Solution Approach 1:
The patent implements a feedback control system where the blood flow sensor continuously monitors arterial blood flow levels and provides data to the controller. The controller then automatically adjusts the positive pressure from the pump to maintain the desired blood flow level, creating a closed-loop system that responds to real-time physiological conditions.
Solution Approach 2:
The system performs self-regulation by using its own sensor data to control its own operation. The controller automatically adjusts pressure based on sensor feedback without requiring external intervention, enabling the system to maintain optimal blood flow levels autonomously.
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 enables precise monitoring and control of blood flow, optimizing therapy by ensuring the target arterial blood flow is maintained, which can enhance muscle strength and growth without the need for high-intensity exercise.
Implementation Method 1
The blood flow sensor can be a photoplethysmography (PPG) sensor with an LED and a photodiode. The PPG sensor can be in an absorptive mode with the LED and the photodiode disposed on opposite side of the interior surface of the cuff.
Implementation Method 2
The PPG sensor can be in an absorptive mode with the LED and the photodiode disposed on opposite side of the interior surface of the cuff.
Implementation Method 3
The PPG sensor can be in a reflectance mode with the LED and the photodiode aligned on one side of the interior surface of the cuff.
Data Source
AI summary
A cuff for measuring blood flow through arteries of a limb may include an interior surface, a bladder, and a blood flow sensor. The interior surface of the cuff is configured to be secured around the limb. The bladder is configured to be fluidly coupled to a source of positive pressure. The bladder is further be adapted to inflate in response to application of a positive pressure and restrict blood flow through the arteries of the limb when inflated. The blood flow sensor is coupled to the interior surface and disposed between the interior surface and the limb. The blood flow sensor is configured to measure blood flow through the arteries of the limb.