Air-Pulse Generator for High-Frequency Chest Wall Oscillation
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Solution Overview
Problem
Current methods for clearing respiratory mucus, such as Chest Physical Therapy, are labor-intensive, technique-sensitive, and require assistance, limiting the independence of patients with conditions like cystic fibrosis and being less effective as the caregiver becomes tired.
Innovation Solution
A medical device providing high-frequency chest wall oscillations using an air-pulse generator, inflatable vest, and flexible hose to transmit air pressure pulses, enhancing mucus clearance through repetitive compression forces, which can be controlled digitally for consistent treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Chest Physical Therapy is performed manually by a caregiver, then mucus clearance can be achieved, but the method becomes labor-intensive and effectiveness decreases as the caregiver becomes tired
Solution Approach 1:
The device enables self-administered chest physiotherapy through automated pneumatic compression, allowing patients to perform mucus clearance therapy independently without caregiver assistance. The wearable vest with inflatable bladders automatically applies rhythmic compression forces to the chest wall, eliminating the need for manual percussion and positioning by caregivers.
Solution Approach 2:
The invention replaces the manual mechanical system of caregiver-performed chest percussion and vibration with an automated pneumatic compression system. The device uses a portable air compressor and control circuitry to generate programmed sequences of inflation and deflation cycles that replicate and enhance the therapeutic effects of manual chest physical therapy.
2Reliability
If manual chest manipulation techniques are used, then mucus clearance can be achieved, but the method is technique-sensitive and requires skilled assistance
Solution Approach 1:
The device incorporates programmable control circuits that allow dynamic adjustment of compression parameters including inflation pressure, deflation rate, cycle frequency, and treatment duration. The microprocessor-controlled system can be programmed with different treatment protocols tailored to specific patient needs and lung segments, eliminating the need for caregiver expertise in technique selection and execution.
Solution Approach 2:
The device includes sensors and control circuits that monitor and regulate the compression cycles, ensuring consistent and reproducible therapeutic forces are applied. The feedback control system maintains predetermined pressure and timing parameters throughout the treatment, guaranteeing reliable mucus clearance effectiveness regardless of operator skill level.
3Reliability
If automated digital control is implemented, then treatment consistency is improved, but device complexity increases
Solution Approach 1:
The device integrates multiple functions into a single portable unit: the air compressor serves both as the power source for pneumatic compression and as part of the sealed system for the inflatable bladders. The microprocessor controller combines timing, pressure regulation, and sequence control in one integrated circuit board. The wearable vest incorporates both the therapeutic compression mechanism and the sensing elements for feedback control.
Solution Approach 2:
The device uses pneumatic principles to achieve treatment consistency through controlled inflation and deflation cycles of the wearable bladders. The portable air compressor generates regulated air pressure that is delivered through valves and tubing to the bladders, creating reproducible compression forces. The pneumatic system naturally provides smooth, rhythmic cycles that are difficult to achieve with purely mechanical actuators.
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 device effectively promotes airway clearance and bronchial drainage, reducing the viscosity of lung mucus and facilitating its removal, thereby improving respiratory function and reducing the need for constant caregiver assistance.
Implementation Method 1
a pulsator for generating repetitive air pressure pulses... an air-inflatable vest... a flexible hose coupling the generator to the vest for transmitting air pressure and pressure pulses from the generator to the vest
Implementation Method 2
The pulsator provides high frequency chest wall oscillations... High frequency chest wall oscillations enhance mucus clearance in the person's respiratory system
Implementation Method 3
Scotch yoke motion transmitting mechanisms change rotatory motion from a brushless dc electric motor to reciprocating movements of the diaphragms that pump and pulse the air
Data Source
AI summary
A vest for a human body has an air core coupled to a pulsator operable to subject the vest to pulses of air which applies and releases high frequency pressure forces to the body. The pulsator has two diaphragms connected to a brushless electric dc motor with rotary to reciprocating linear motion transmitting mechanisms comprising scotch yokes having anti-lash assemblies operable to generate air pulses in an air pulsing chamber. The diaphragms also increase the pressure in a manifold chamber. A check valve connects the manifold chamber with a pulsing chamber to allow pressurized air to flow from the manifold chamber into the pulsing chamber. An air flow control valve in communication with the manifold chamber is used to adjust the pressure of the air in the manifold and pulsing chambers. A programmable motor controller adjusts the duration of operation and speed of the motor to vary the operational time and frequency of the air pulses.