Fisher & Paykel Healthcare has been granted a patent for a respiratory assistance system that can deliver high flow therapy to patients. The system includes a patient interface and a gas source, with a controller that can adjust the operating flow rate of the gas. The controller applies multiple test flow rate values and measures patient parameters to determine a new flow rate value for optimal delivery of gas to the patient. GlobalData’s report on Fisher & Paykel Healthcare gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Fisher & Paykel Healthcare, Wearable CPAP therapy was a key innovation area identified from patents. Fisher & Paykel Healthcare's grant share as of September 2023 was 55%. Grant share is based on the ratio of number of grants to total number of patents.

Respiratory assistance system with adjustable gas flow rate

Source: United States Patent and Trademark Office (USPTO). Credit: Fisher & Paykel Healthcare Corporation Ltd

A recently granted patent (Publication Number: US11771858B2) describes a method for delivering gas to a patient using a respiratory assistance system. The method involves applying a range of test flow rate values as the operating flow rate and measuring at least one patient parameter corresponding to each of these values. The rate of change in the measured patient parameter is determined as a function of the change in the applied test flow rate values. Based on this information, a new flow rate value is determined, and the operating flow rate is changed accordingly.

The method also includes determining a value within the range of test flow rate values at which the rate of change in the measured patient parameter approaches zero. Additionally, the new flow rate value can be determined by identifying the minimum or maximum value of the measured patient parameter for each test flow rate value.

The patient parameter that is measured can include respiratory rate, which can be determined based on various measurements such as pressure fluctuations, flow rate fluctuations, blower fan speed, blower motor power, blower motor torque, expired CO2 fluctuations, transcutaneous CO2 fluctuations, expired patient temperature, EMG signals, Edi signals, impedance pneumography, respiratory inductance plethysmography, or acoustic sensing.

Other patient parameters that can be measured include work of breathing indicator, expiratory CO2 concentration indicator, or thoracoabdominal asynchrony indicator. The method aims to minimize or reduce the patient's respiration rate by selecting an operating flow rate that achieves this.

The method also involves generating an alarm if the measured patient parameter is insensitive to the change in the operating flow rate. This can indicate a potential issue with the respiratory assistance system.

The patent further describes the components of the respiratory assistance system, including the patient interface (such as nasal cannula, nasal mask, or full face mask), the gas source (such as a blower, flow meter, ventilator flow mode, or blender), and the inclusion of a humidifier to humidify the gas before delivery to the patient.

Overall, this patent presents a method for optimizing the delivery of gas to a patient using a respiratory assistance system by adjusting the operating flow rate based on measured patient parameters. This approach aims to improve patient comfort and optimize respiratory support.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.