System and method for affecting porosity of tissue barriers, including blood brain barrier, and delivery of active agents
Systems, devices, and methods for modulating permeability of a membrane barrier (e.g., BBB), such as by increasing and/or decreasing porosity of the membrane barrier. The membrane barrier may be modulated indirectly through neuromodulation, which may include stimulation of an upstream neural body (e.g., a ganglion) that affects, either directly or indirectly, the permeability of the membrane barrier. Modulating a membrane barrier has uses in selective delivery of active agents or other substances through the membrane barrier into tissues or cells. In some situations, these active agents or other substances would not be able to pass through the barrier without modulation. Modulating a membrane barrier has uses in selective drainage of fluid, waste, and/or byproducts from the tissue or cells from one side of the membrane barrier, or reducing the porosity of the membrane barrier to correct a leaky barrier.
1 . A method for controlling permeability of a blood-brain barrier in a subject, comprising:
measuring a predetermined parameter using a sensor to determine when an active agent is available in the subject for passing through the blood-brain barrier;
applying a first electrical stimulation to a sphenopalatine ganglion of the subject at a first frequency to selectively increase a porosity of the blood-brain barrier when the predetermined parameter indicates the active agent is available;
monitoring a physiological response of the subject; and
applying a second electrical stimulation to the sphenopalatine ganglion of the subject at a second frequency different than the first frequency to selectively decrease the porosity of the blood-brain barrier based on the monitored physiological response.
2 . The method of claim 1 , wherein the predetermined parameter comprises at least one of time elapsed, delivered active agent dosage, active agent concentration in the body, change in active agent concentration, or change of concentration of a substance in blood of the patient indicating that the substance has passed through the blood-brain barrier.
3 . The method of claim 1 , wherein the electrical stimulation to increase porosity comprises a frequency of 10 Hz to 40 Hz and a current of 0.1 to 3 mA.
4 . The method of claim 3 , wherein the electrical stimulation to decrease porosity comprises a frequency of 60 Hz to 200 Hz and a current of 0.1 to 3 mA.
5 . The method of claim 1 , wherein the electrical stimulation comprises a biphasic, charge-balanced waveform.
6 . The method of claim 5 , wherein the biphasic waveform is amplitude modulated with a sinusoidal frequency.
7 . The method of claim 1 , wherein the physiological response comprises transendothelial electrical resistance measurements to determine blood-brain barrier integrity.
8 . A system for modulating blood-brain barrier permeability of a subject, comprising:
an electrode assembly configured to deliver electrical stimulation to a sphenopalatine ganglion of the subject;
a sensor configured to monitor a predetermined parameter related to an active agent concentration in the subject; and
a controller, including a processor, configured to:
execute a machine learning algorithm to analyze sensor data received from the sensor and determine optimal stimulation parameters for the electrode assembly; and
automatically adjust the electrical stimulation delivered by the electrode assembly based on the optimal stimulation parameters determined by the machine learning algorithm analysis to selectively increase and decrease porosity of the blood-brain barrier.
9 . The system of claim 8 , wherein the electrode assembly comprises an electrode body positioned medial to a zygoma on a posterior maxilla within a buccal fat pad of a cheek, and an electrode lead positioned within a pterygopalatine fossa in proximity to the sphenopalatine ganglion.
10 . The system of claim 9 , wherein the electrode assembly further comprises a fixation apparatus configured to anchor to a zygomaticomaxillary buttress.
11 . The system of claim 8 , wherein the sensor is configured to monitor a parameter comprising at least one of time elapsed, delivered active agent dosage, active agent concentration in the body, change in active agent concentration, or change of concentration of a substance in blood of the patient indicating that the substance has passed through the blood-brain barrier.
12 . The system of claim 11 , wherein the controller is configured to automatically initiate electrical stimulation at a frequency of 10 Hz to 40 Hz to increase porosity of the blood-brain barrier when the predetermined parameter indicates an active agent is available for passing through the blood-brain barrier.
13 . The system of claim 12 , wherein the controller is further configured to automatically adjust the electrical stimulation to a frequency of 60 Hz to 200 Hz to decrease porosity of the blood-brain barrier based on the machine learning algorithm analysis of the sensor data.
14 . A computer-implemented method for optimizing blood-brain barrier modulation of a subject using artificial intelligence, comprising:
receiving sensor data indicating a physiological parameter of the subject;
processing the sensor data using a machine learning algorithm to predict a stimulation parameter for increasing a permeability of the blood-brain barrier;
generating a first control signal for an electrode assembly based on the predicted stimulation parameter to increase the permeability of the blood-brain barrier;
analyzing real-time feedback data from a feedback sensor to determine when to decrease the permeability of the blood-brain barrier; and
generating a second control signal for the electrode assembly based on the analysis of the real-time feedback data to decrease the permeability of the blood-brain barrier.
15 . The computer-implemented method of claim 14 , wherein the machine learning algorithms comprise supervised learning algorithms trained using historical patient data to predict optimal amplitude, pulse width, or frequency parameters.
16 . The computer-implemented method of claim 15 , wherein the machine learning algorithms further comprise reinforcement learning algorithms that systematically evaluate different parameter combinations and adapt based on observed outcomes.
17 . The computer-implemented method of claim 14 , wherein the physiological parameters comprise tissue impedance measurements, neural response signals, heart rate variability, blood pressure variations, or electroencephalography signals.
18 . The computer-implemented method of claim 17 , wherein analyzing the real-time feedback data comprises processing transendothelial electrical resistance measurements to determine blood-brain barrier integrity.
19 . The computer-implemented method of claim 14 , wherein the control signals comprise biphasic, charge-balanced waveforms with frequencies of 10 Hz to 40 Hz for opening the blood-brain barrier and frequencies of 60 Hz to 200 Hz for closing the blood-brain barrier.
20 . The computer-implemented method of claim 19 , wherein the biphasic waveforms are amplitude modulated with a sinusoidal frequency and the machine learning algorithms automatically adjust at least one of pulse width modulation, frequency modulation, or amplitude modulation to optimize blood-brain barrier permeability.