Multimode device and method for controlling breathing
A device and method is provided for therapeutic stimulating, augmenting, manipulating and/or controlling breathing, in combination with stimulation of auxiliary respiratory nerves or muscles including the upper airway tract, chest wall muscles or abdominal muscles. Stimulation may be provided, for example, to augment breathing or to prevent closing of the upper airway during therapeutic stimulation. Stimulation may be also provided to the Hypoglossal nerve during exhalation.
1. A device for manipulating breathing of a subject, comprising:
a phrenic nerve and/or diaphragm tissue stimulation element comprising at least a first electrode;
an upper airway stimulation element comprising at least a second electrode, where the first electrode or second electrode are configured for transvenous placement;
a controller in communication with the first and second electrodes and programmed to supply a first stimulation signal through the first electrode during at least one existing breath to a phrenic nerve and/or diaphragm tissue to elicit a diaphragm response without initiating a new breath during a respiratory cycle of the subject having intrinsic respiration and to further supply a second stimulation signal through the second electrode during at least one existing breath to tissue associated with an upper airway of the subject during said respiratory cycle to elicit a response of an upper airway musculature; and,
a sensor in communication with the controller, wherein the sensor is configured to detect at least one parameter of the respiratory cycle,
wherein the controller is further programmed to coordinate the first and second stimulation signals provided by the phrenic nerve and/or diaphragm tissue stimulation element and upper airway stimulation element with respect to each other to supply diaphragm stimulation and upper airway stimulation such that the breath is supplemented, and
wherein the controller is also programmed to adjust a waveform of the first stimulation signal in response to the sensed parameter of the respiratory cycle.
2. The device of claim 1 wherein the controller is further programmed to stimulate the upper airway via the upper airway stimulation element during a first respiratory cycle prior to inspiration of a next respiratory cycle.
3. The device of claim 2 wherein the controller is further programmed to stimulate the upper airway via the upper airway stimulation element during an exhalation cycle of a first respiratory cycle prior to inspiration of the next respiratory cycle.
4. The device of claim 3 wherein the controller is further programmed to provide the first stimulation signal via the phrenic nerve and/or diaphragm tissue stimulation element to stabilize an airway and a subsequent stimulation signal via the phrenic nerve and/or diaphragm tissue stimulation element.
5. The device of claim 4 wherein the controller is further programmed to provide an increased lung volume beyond a baseline via the phrenic nerve and/or diaphragm tissue stimulation element.
6. The device of claim 1 wherein the controller is further programmed to provide stimulation via the phrenic nerve and/or diaphragm tissue stimulation element to supplement an intrinsic breath of said next respiratory cycle.
7. The device of claim 1 wherein the controller is further programmed to increase a functional residual capacity of the subject by providing a stimulation via the phrenic nerve and/or diaphragm tissue stimulation element while stiffening the airway.
8. The device of claim 1 wherein the controller is further programmed to provide stimulation via the diaphragm stimulation element to augment or supplement a tidal volume of the intrinsic respiration of a subsequent respiratory cycle.
9. The device of claim 1 wherein the controller is thither programmed to provide stimulation via the phrenic nerve and/or diaphragm tissue stimulation element to increase lung volume.
10. A method for manipulating breathing of a subject, comprising:
providing a phrenic nerve and/or diaphragm tissue stimulation element comprising at least a first electrode and an upper airway stimulation element comprising at least a second electrode;
positioning the first electrode and/or second electrode transvenously;
monitoring a respiratory parameter of the subject;
supplying a first stimulation signal through the first electrode during an existing breath to a phrenic nerve and/or diaphragm tissue of the subject to elicit a diaphragm response without initiating a new breath during intrinsic respiration of the subject, wherein the first stimulation signal has a waveform which elicits the diaphragm response and which is adjusted in response to the monitored respiratory parameter;
supplying a second stimulation signal through the second electrode during the existing breath to tissue associated with an upper airway of the subject to elicit a response of an upper airway musculature; and
stimulating the upper airway musculature during an exhalation cycle of a first respiratory cycle prior to an inspiration portion of a next respiratory cycle.
11. The method of claim 10 wherein supplying a first stimulation signal comprises eliciting the diaphragm response by augmenting an intrinsic breath.
12. The method of claim 11 wherein augmenting an intrinsic breath comprises augmenting the breath during said next respiration cycle.
13. The method of claim 10 wherein the step of supplying a first stimulation signal comprises eliciting the diaphragm response by providing a lung volume bias stimulation without eliciting a respiratory cycle.
14. The method of claim 10 wherein supplying a second stimulation signal comprises supplying the second stimulation signal to tissue associated with an auxiliary musculature associated with the subject's respiratory system to elicit an auxiliary response of the auxiliary musculature.
15. The method of claim 14 further comprising coordinating the first and second stimulation signals respectively such that the breath is augmented.
16. The method of claim 15 wherein coordinating the first and second stimulation signals comprises coordinating the diaphragm stimulation with one or more of upper airway stimulation, chest wall stimulation and abdominal stimulation.
17. The method of claim 10 wherein positioning the first electrode and/or second electrode transvenously comprises positioning the electrode in proximity to at least the phrenic nerve and/or diaphragm tissue.