Inspiratory proportional pressure assist ventilation controlled by a diaphragm electromyographic signal
First Claim
1. A method of controlling a lung ventilator in view of assisting inspiration of a patient, said lung ventilator comprising an inspiratory implement to be worn by the patient, an air supply system for supplying air to the inspiratory implement in order to assist patient'"'"'s inspiration, and a control unit for controlling the air supply system in relation to an input signal, said method comprising the steps of:
- detecting electromyographic signals produced by the patient'"'"'s diaphragm by means of an array of electrodes passing through the center of the patient'"'"'s diaphragm depolarizing region, each electrode-detected electromyographic signal comprising an electromyographic component and a noise component;
determining the position of the center of the patient'"'"'s diaphragm depolarizing region by detecting a reversal of polarity of the electromyographic component of the electrode-detected electromyographic signals;
subtracting a first electromyographic signal detected by the electrodes of the array on a first side of the center of the patient'"'"'s diaphragm depolarizing region, from a second electromyographic signal detected by the electrodes of the array on a second side, opposite to said first side, of the center of the patient'"'"'s diaphragm depolarizing region, wherein (a) the first electrode-detected electromyographic signal has an electromyographic component of a first polarity, (b) the second electrode-detected electromyographic signal has an electromyographic component of a second polarity opposite to said first polarity, (c) the subtraction subtracts the noise components of the first and second electrode-detected electromyographic signals from each other but adds the respective electromyographic components of said first and second electrode-detected electromyographic signals together to produce an electromyographic signal of improved signal-to-noise ratio representative of a demand to inspire from the patient'"'"'s brain; and
supplying said electromyographic signal of improved signal-to-noise ratio as input signal to the control unit of the lung ventilator for controlling the air supply system and therefore the inspiration assist in relation to the electromyographic signal of improved signal-to-noise ratio.
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Accused Products
Abstract
To control a lung ventilator comprising an inspiratory implement to be worn by the patient, an air supply system for supplying air to the inspiratory implement, and a control unit for controlling the air supply system, electromyographic signals produced by the patient'"'"'s diaphragm are detected by an array of electrodes passing through the center of the patient'"'"'s diaphragm depolarizing region. The position of the center of the patient'"'"'s diaphragm depolarizing region is determined through detection of a reversal of polarity of the electromyographic component of the electrode-detected electromyographic signals. First and second electromyographic signals detected by the electrodes of the array on opposite sides of the patient'"'"'s diaphragm depolarizing region are subtracted from each other, this subtraction cancelling the noise components of the first and second electromyographic signals but adding the respective electromyographic components of these first and second signals together to produce an electromyographic signal having an improved signal-to-noise ratio, having a reduced electrode-position-induced filter effect, and being representative of a demand to inspire from the patient'"'"'s brain. The electromyographic signal of improved signal-to-noise ratio is finally supplied as input signal to the control unit of the lung ventilator for controlling the air supply system and therefore the inspiration assist in relation to the electromyographic signal of improved signal-to-noise ratio and of reduced electrode-position-induced filter effect, and therefore in relation to the demand to inspire from the patient'"'"'s brain.
107 Citations
21 Claims
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1. A method of controlling a lung ventilator in view of assisting inspiration of a patient, said lung ventilator comprising an inspiratory implement to be worn by the patient, an air supply system for supplying air to the inspiratory implement in order to assist patient'"'"'s inspiration, and a control unit for controlling the air supply system in relation to an input signal, said method comprising the steps of:
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detecting electromyographic signals produced by the patient'"'"'s diaphragm by means of an array of electrodes passing through the center of the patient'"'"'s diaphragm depolarizing region, each electrode-detected electromyographic signal comprising an electromyographic component and a noise component; determining the position of the center of the patient'"'"'s diaphragm depolarizing region by detecting a reversal of polarity of the electromyographic component of the electrode-detected electromyographic signals; subtracting a first electromyographic signal detected by the electrodes of the array on a first side of the center of the patient'"'"'s diaphragm depolarizing region, from a second electromyographic signal detected by the electrodes of the array on a second side, opposite to said first side, of the center of the patient'"'"'s diaphragm depolarizing region, wherein (a) the first electrode-detected electromyographic signal has an electromyographic component of a first polarity, (b) the second electrode-detected electromyographic signal has an electromyographic component of a second polarity opposite to said first polarity, (c) the subtraction subtracts the noise components of the first and second electrode-detected electromyographic signals from each other but adds the respective electromyographic components of said first and second electrode-detected electromyographic signals together to produce an electromyographic signal of improved signal-to-noise ratio representative of a demand to inspire from the patient'"'"'s brain; and supplying said electromyographic signal of improved signal-to-noise ratio as input signal to the control unit of the lung ventilator for controlling the air supply system and therefore the inspiration assist in relation to the electromyographic signal of improved signal-to-noise ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for controlling a lung ventilator in view of assisting inspiration of a patient, said lung ventilator comprising an inspiratory implement to be worn by the patient, an air supply system for supplying air to the inspiratory implement in order to assist patient'"'"'s inspiration, and a control unit for controlling the air supply system in relation to an input signal, said device comprising:
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an array of electrodes for detecting electromyographic signals produced by the patient'"'"'s diaphragm, said array of electrodes passing through the center of the patient'"'"'s diaphragm depolarizing region, and each electrode-detected electromyographic signal comprising an electromyographic component and a noise component; means for determining the position of the center of the patient'"'"'s diaphragm depolarizing region by detecting a reversal of polarity of the electromyographic component of the electrode-detected electromyographic signals; means for subtracting a first electromyographic signal detected by the electrodes of the array on a first side of the center of the patient'"'"'s diaphragm depolarizing region, from a second electromyographic signal detected by the electrodes of the array on a second side, opposite to said first side, of the center of the patient'"'"'s diaphragm depolarizing region, wherein (a) the first electrode-detected electromyographic signal has an electromyographic component of a first polarity, (b) the second electrode-detected electromyographic signal has an electromyographic component of a second polarity opposite to said first polarity, (c) the subtraction subtracts the noise components of the first and second electrode-detected electromyographic signals from each other but adds the respective electromyographic components of said first and second electrode-detected electromyographic signals together to produce an electromyographic signal of improved signal-to-noise ratio representative of a demand to inspire from the patient'"'"'s brain; and means for supplying said electromyographic signal of improved signal-to-noise ratio as input signal to the control unit of the lung ventilator for controlling the air supply system and therefore the inspiration assist in relation to the electromyographic signal of improved signal-to-noise ratio. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification