The disclosed technology relates generally to health monitoring and treatment, and, more specifically, to implementations involving hypertension monitoring and/or treatment device(s) and methods.
The following discloses cardiac health monitoring systems and methods, aspects of which may bear relation to and/or involve features consonant with existing hypertension treatment devices, such as those of U.S. Pat. No. 7,713,295, issued May 11, 2010. The hypertension treatment device described in the above patent provides a treatment via thermal stimulation of baroreceptors located at the carotid sinus located in the neck region of a human body. To make treatment more effective and comprehensive, however, inclusion of heart activity monitoring systems, components, features and/or functionality within or associated with a device involve or yield further innovations, as well as improvements such as before-and-after heart activity changes, such as those resulting from treatment performed by the present device, and other novel aspects, outputs and/or results.
Since Blood Pressure (BP) is a measure on cardiovascular health condition, it will be helpful for understanding individual cardiovascular health status if other heart-related measures, such as Heart Rate (HR), Heart Rate Velocity (HRV), Electrocardiographic (ECG), and related abnormalities, can be monitored.
The most common method for acquiring blood pressure readings today involve an inflatable cuff type device either in conjunction with stethoscope auscultation of the arteries distal to the inflated bladder cuff (sphygmomanometers) or by sensors internal to the inflatable cuff that capture the bruit created by occluding, and then slowly release the tourniquet around the arteries of the upper arm. Due to the cumbersome method of applying the inflatable cuff appropriately to insure an accurate reading of these methods, conventional cuff-type blood pressure sphygmomanometers and digital blood pressure monitors are inherently awkward in providing a facile measure of blood pressure representative of cardiac pumping activity.
New methods for collecting blood pressure and several other physiologic parameters have been pursued using various sensors and algorithms that can analyze electocardiographic activity in combination with spectrographic readings of the variation vascular capillary color in the extremities, obviating the need for occlusive bladder type devices with devices that can be applied to the wrist and fingers, however these approaches have had varying success. Wrist and mobile devices that utilize PPG and/or ECG sensors have technical limitations. Devices that use a PPG sensor need a higher power light source in order to capture physiological data from the human body. Further, wrist and mobile devices are limited by their size and are unable to increase the battery power sufficiently. Additionally, the devices must come in direct contact with the skin without a cap between the skin and sensors; otherwise, the index would decrease the accuracy of the recorded data.
Implementations herein may include and/or involve an integrated system of a thermal module for hypothermic stimulation and a ECG/PPG (Photoplethysmography) module or sensor set for measuring BP, HR, HRV, and other cardiovascular health indices, achieving innovative implementations and functionality that far surpass the performance and utility of current physiologic monitoring systems, devices and/or methods.
According to some implementations herein, various combination devices that provide therapy and/or monitoring capabilities of a person's blood pressure, incorporating a PPG/ECG integrated sensor within the handle of a hypothermia therapy device for persons with hypertension, are provided. In certain aspects, after obtaining a pre-treatment blood pressure reading, devices herein may be placed against the neck over the carotid artery to effect stimulation of the carotid baroreceptors of the user, which triggers an autonomic nervous system response lowering blood pressure and heart rate. The blood pressure may then again be recorded, following treatment, to observe the results. Further, various monitoring functionality may be utilized, such as features involving the capability of uploading the measured physiologic data to a smart phone, other computing devices, etc. for viewing and archiving of the data, and for subsequent transmittal to the cloud or caregiver to manage the user's treatment regimen.
In addition, various implementations, systems, devices, and methods consistent with the present innovations may include and/or involve a wireless communication interface for transmitting measured data to smartphone, other mobile device, PC or other device or location so that the data can be displayed, stored, processed, and also transmitted to doctors, medical facilities such as hospitals and clinics, as well as other third parties or entities.
Various embodiments of the invention are disclosed in the following detailed description and the accompanying drawings
Hypertension is a serious medical condition that is common among large portion of the population today. Estimated to be nearly 46% of American according to the new American Heart Association guidelines published in 2017. This condition is normally classified as being “high blood pressure” and is a result of blood flowing through blood vessels with a greater force than thought to be normal.
Increased blood flow within the human body can result from a number of factors: diabetes, obesity, smoking, lack of physical activity, and aging. These factors lead to a buildup of plaque and a stiffening of the walls in the arteries that cause an increase in blood pressure requiring the heart to work harder to maintain constant blood flow within the body. The greater pressure causes a strain on a subject's heart and results in further damage to blood vessels, as well as other problems such as myocardial infarction, kidney failure and stroke, which can lead to death.
A device previously disclosed in U.S. Pat. No. 7,713,295 implements the use of hypothermia therapy device to reduce hypertensive conditions through noninvasive means. Here, a temperature controlled hypothermic end of a more rudimentary shape is applied to the carotid sinus of a patient for a designated duration. This application of low temperature stimulation induces a baroreflex activation within the human body and can reduce the blood pressure of subject as a result.
According one or more of present implementations, the integration of advanced biosensor device(s) and/or sensors in conjunction with the hypothermic therapy device disclosed herein may be utilized to provide feedback innovatively to a user, such as feedback regarding the effectiveness of treatment(s) aimed at reducing hypertension. Systems and methods herein allow the user to monitor and record the progress of his or her blood pressure therapy and similar biological conditions as a result of utilizing the device and associated features and functionality. Along with the ability to monitor and track the effectiveness of the treatment, certain implementations also enable the user to easily share and analyze the data with family members, medical/health professionals, and/or other third parties or entities.
Various innovative systems and methods herein utilize new configurations of hardware, such as specialized PPG and ECG sensor sets, some of which having a concave design and/or be combined with software involved in the capture and analysis of the physiologic data. The concave sensor designs herein avoid ambient light interference with the specialized PPG receiver and interrelated ECG sensor capture features of the physiologic parameters. These innovative combinations are able to efficaciously filter human and mechanical noise and directly deliver the physiological data to the device. Additionally, one or more aspects of the disclosed technology may include an illumination source utilizing green light versus the more common red light illumination employed in other devices. New orientations of the light (illumination) component of the PPG sensor function, and novel algorithms processing the data from the novel hardware configuration provide a highly-accurate measures of blood pressure as compared to other technologies using PPG and ECG technologies in their attempts to provide meaningful, accurate information. Table 1 illustrates blood pressure data from one existing/competitor product, a cuff BP monitor data, versus the disclosed PPG/ECG sensor data and information resulting from the innovations herein. As shown here and in other tests, the systolic and diastolic data achieved from the presently-disclosed inventions are much closer to the actual results that those from such cuff style BP monitor.
Various innovations herein may be implemented in many ways such as an apparatus, a system, or a computer software in conjunction with proper sensors, a processor, and a storage medium. In this invention, such an implementation is referred to as a system. In general, the disclosed system may have different components such as a processor, circuitry or a storage medium in order to be implemented within an existing device, and those components to process data are referred to as “processor”.
The following description of one or more embodiments of the invention is provided with accompanying figures that show the principles of the invention. The scope of the invention is limited only by the claims and the invention contains numerous alternatives, modifications, and equivalents.
The thermal portion 102, which in some implementations may be shaped as part of a tip portion of the device 100, may provide pressure, cooling and/or other treatment features, such as set forth in more detail in the devices of U.S. Pat. No. 7,713,295, issued May 11, 2010, as well as published PCT patent applications WO2015/134394A1 and WO2015/134397A1 and their related U.S. counterparts, application Ser. No. 15/256,113, filed Sep. 2, 2016, published as US 2017/0049611 A1, and application Ser. No. 15/256,342, filed Sep. 2, 2016, published as US 2017/0056238 A1, all of which are incorporated herein by reference in entirety.
It is noted, here, that various implementations herein consistent with
Additional features of the structure and precise geometric shape of various devices included within the ambit of the innovations herein are set forth in more detail in Appendix A, which shows various diagrams of such devices in dimension scale (angles, shape, etc.) consistent with certain implementations.
According to some implementations, systems or devices consistent with the innovations herein may also include and/or involve a biosensor for use in conjunction with a hypertension treatment device set forth in U.S. Pat. No. 7,713,295, as well as published PCT patent applications WO2015/134394A1 and WO2015/134397A1 and their related U.S. counterparts, application Ser. No. 15/256,113, filed Sep. 2, 2016, published as US 2017/0049611 A1, and application Ser. No. 15/256,342, filed Sep. 2, 2016, published as US 2017/0056238 A1, all of which are incorporated herein by reference in entirety. Such systems or products may be integrated into or used as a separate device in connectivity with said hypertension treatment device as a means of monitoring treatment efficiency and hypertensive conditions. In certain implementations, blood pressure measurements may be taken via such device(s) before, during, and after treatment as shown in
Various systems and devices disclosed herein may be integrated into said hypertension treatment device to function as one complete device as shown in
A device disclosed herein can be separate from the hypertension treatment device as shown in
A device disclosed herein can include a wireless communication module to possess the ability to transmit or receive data from one or more PCs, mobile phones, or of other mobile devices using the Cloud, Bluetooth, BLE, WiFi, ZigBee, RF, and other wireless network. In addition, measured and analyzed personal data can be stored in the cloud network, which only authorized users can upload and download data and analyzed results. All data in the cloud network are encrypted for personal privacy and security. The wireless communication module can allow the user to interface the hypertension treatment device with the biosensor or other devices to transmit information such as blood pressure and/or physiologic measurements. The wireless communication module can allow the parallel device to communicate with the hypertension treatment device regarding the proper times to take the initial and final blood pressure measurements.
A device disclosed herein can include a data logging module to possess the ability to store information received from the biosensor as a means of monitoring treatment efficacy over extended periods of time. Once this information is logged, a communication module can be used to send the data to a display (i.e., a built-in display, phone, tablet, computer, etc.). The data logging module can help the user display the treatment effects as a result of the hypertension treatment device and share that information with family members and/or medical/health professionals.
Prior to the hypertension treatment device being applied to the patient, the biosensor device will be used to measure the patient's blood pressure and/or other physiologic measurements as a comparison point for during-treatment and post-treatment values.
As discussed in more detail below in connection with
A fundamental non-invasive measure of cardiovascular activity is the ECG. Traditionally ECG signal can be recorded by the electrodes located on the chest, the wrists and the ankles Recently new ECG sensor technology is developed for measuring ECG from the fingertips or the wrist. However this technology requires a circuit across the body most often via hands or arms.
It is possible to compute many cardiovascular health indices from the ECG. HR, HRV, R-R interval, and even the respiratory rate can be calculated.
PPG can also be used to calculate HR, HRV and beat-to-beat interval. PPG sensor is generally located at the fingertip or earlobe. It however can be located on the skin over any blood vessel.
Blood pressure is an important measure of cardiovascular health status. Currently there are two common and non-invasive methods to measure arterial blood pressure. The Auscultatoric method requires an aneroid sphygmomanometer (an inflatable bladder placed around the upper arm typically connected to a mechanical pressure gauge) and a stethoscope to listen to the blood flow during inflation and deflation of the cuff in order to obtain blood pressure and is a widely accepted method in the clinical environment. The Oscillometric method also requires an inflatable bladder or arm cuff, but uses a pressure sensor located in the bladder to acquire the blood pressure reading. It is not uncommon to find digital oscillometric blood pressure monitors as well as sphygmomanometers in hospital and otherplaces.
Non-Invasive Blood Pressure Measurement with Biosensors
The circulatory system is, in principle, a hydraulic system, thus it means that one can monitor changes in the blood pressure in artery by obtaining on pulse wave velocity and the time delay of the pulses. The speed of the arterial pressure wave travels in known to be directly proportional to BP. The pulse wave velocity (PWV) can be measured using ECG and PPG signals. PTT (Pulse Transit Time), 1/PWV, is generally used to compute BP. PTT is defined as the time the pulse travels between two arterial sites within the same cardiac cycle. When both the ECG and PPG signal are recorded, the PTT is the time the R peak of the ECG and systolic peak of the PPG pulse, as seen, for example in
Once PTT values are obtained from ECG and PPG signals, PWV may be calculated by dividing PTT by the distance from the heart to the location of the sensor. BP is then applied to a linear model as below:
BP=a*PWV+b or
BP=c*PTT+d
Then calibration process is applied to the model to determine coefficients, a, b, c and d In an example case, it was shown that the systolic BP with PTT could be calculated by
Systolic BP=−0.69×PTT+228.59
In other example case, it's shown that the systolic BP and diastolic BP can be calculated with PWV.
Systolic BP=0.051×PWV+62.56 Diastolic BP=0.05×PWV+17.48
The QRS complex 908 is a prominent feature of the ECG signal, which is associated with cardiac health and implementations herein. Accurate detection of the QRS complex can form the basis of extraction of other features and parameters from the ECG signal. There are many known techniques for detecting the QRS complex from the ECG signal. Fast Fourier Transform (FFT), Discrete Fourier Transform (DFT), and Wavelet transforms are widely used for detecting QRS complex. Some techniques use amplitude, slope and threshold limit in addition to filters and mathematical functions. Several new techniques were developed based on Artificial Neural Network (ANN), fuzzy logic, and genetic algorithm. Combinations of the Wavelet transform, adaptive threshold, and neural network algorithms can be used to feature extraction and classification of the QRS complex. Monitoring R-R interval of the ECG signal makes possible to detect atrial fibrillation. Cardiac arrhythmia can also be detected based on the rhythm of the ECG.
Some cardiac abnormalities which can be characterized by ECG patterns are as follows;
There are many cardiovascular health indices which can be computed from the ECG signal processing; HR, HRV, respiratory rate (RR), heart age, and stress level.
A normal HR ranges between 60 and 90 BPM. If the HR drops below 50 bpm, it is referred to as Brachycardia. While, if the HR exceeds 100 bpm it is referred to as tachycardia. The average maximum HR with exertion of a normal person is computed as 220 minus the age of the person in years. For an example, an average maximum HR of 40 year old person will be 180 bpm.
HRV includes any indices; SDNN, rMSSD, LF, HF, LF/HF, etc. Normal values and ranges are as follows (HRV: European Heart Journal, 17, 354-381, 1996) SDNN (Standard deviation of NN intervals, ms): 50 (ranges 32˜93) rMSSD (Root mean square of successive differences between NN intervals, ms): 42 (ranges 9˜75) LF (Low frequency power, ms2): 519 (ranges 193˜1009) HF (High frequency power, ms2): 657 (ranges 82˜3630) LF/HF: 2.8 (ranges 1.1˜11.6)
A normal respiratory rate (RR) ranges from 12 to 20 per minute. If the RR exceeds 24 it is the Tachypnea. If the RR goes less than 10 it is Bradypnea.
These cardiovascular health indices based on ECG signal can be computed in the embedded software in microprocessor or computed by the applications of the smart phone, PC, and mobile devices. Some personal data can be used to compute individual cardiovascular health indices with ECG and PPG signal data. Normal values or ranges can be displayed with GUI, and auditory and visual warning signals can be provided if any abnormalities are detected.
The application associated with mobile device 1104 may be configured to facilitate the communication between the mobile device 1104 and hypertension therapy device 1102. In some embodiments, the application may provide a graphical user interface (GUI) that allows a user to configure the mobile device 1104 to collect blood pressure and/or other diagnostic information from the hypertension therapy device 1102. In one example, diagnostic information may be related to beat-to-beat variability of the measured heartbeat. Additionally, the application may provide a GUI that allows a user to determine the proper times to take the initial, intermediate, and final blood pressure measurements using the hypertension therapy device 1102. In some embodiments, the application may facilitate data logging functionality. The data logging functionality facilitates the monitoring of treatment efficacy over extended periods of time by storing information related to measurements performed.
In one embodiment, the application may operate in a diagnostic mode. The diagnostic mode provides a GUI that allows a user to operate the hypertension therapy device 1102 to collect blood pressure and/or other physiologic measurements. In this mode, the application may have a status window 1106 that displays the measurements taken. In one example, real time measurement data may be displayed, an average value of the measurement data may be displayed, and/or the maximum or minimum values of measurement data taken over a time period may be displayed. The application also includes an action window 1108 containing various buttons for performing physiologic measurements. In one example, the buttons may be used to begin, resume, pause, or end measurements. The application also includes a toolbar 1110 that allows users to select various modes of operation of the application. As an example, the toolbar 1110 may allow a user to toggle between a diagnostic mode, device status mode, data logging mode, or configuration mode. In an embodiment of application, the configuration mode may facilitate the pairing (e.g., establishing a communication link) between mobile device 1104 and hypertension therapy device 1102.
The measure interface 1320 may include a measurement window 1322. The measurement window displays measurements taken by hypertension therapy device 1102 and transmitted to mobile device 1104. In the illustrated example, measurement data for “SYS,” “DIA,” and “PULSE” are displayed. In another example, the measurement data may be related to beat-to-beat variability of the measured heartbeat. The measurement data may correspond to the “measure date” indicated on the top of measure interface 1320. In other embodiments, the measurement data may be displayed in real time, as an average value over a period of time, and/or the maximum or minimum values of measurement data taken over a time period is displayed.
The measure interface 1320 may include a measuring indicator 1324. The measuring indicator 1312 displays the device condition while it is disconnected, connected, or measuring.
Alternative graphical representations may be provided if the measurement data indicates that the user's condition is not normal or requires additional attention. The measure interface 1340 may also include a action buttons 1344. The action buttons 1344 may allow the user to restart the measurement or save the measurement data.
The graph interface 1340 may include a graph key 1362. The graph key 1362 may indicate the data sets that are displayed on graph 1364. In the illustrated example, the graph key 1362 indicates that the “SYS,” “DIA,” and “PULSE” data sets are being displayed on graph 1364. In another example, the measurement data may be related to beat-to-beat variability of the measured heartbeat. The graph key 1362 may be color coded to match the color of the curve for each corresponding data set on graph 1346. In some embodiments, the x and y axis may have one or more scales to property fit the curves of each data set into one graph area. The graph interface 1360 may also contain a time frame toolbar 1366. The time frame toolbar 1366 may allow a user to select the desired time frame of data to be displayed on graph 1364. In the illustrated example, the user may toggle between a time frame of one day, one week, one month, or three months.
The history interface 1380 may include a table 1382 that displays measurement data in table form. The table 1382 may include one or more data entries. The data entries may indicate the date and time that measurement data for the entry was taken and the measurement data recorded. In the illustrated example, table 1382 displays entries containing measurement data for “SYS,” “DIA,” and “PULSE.” The history interface 1380 may include a date picker 1384. The date picker 1384 may indicate the specific date of data set that is currently displayed on the history interface 1380. In the illustrated example, the date on the date picker 1382 indicates the date of measurement data that is being displayed in a table 1382.
In some embodiments, the history interface 1380 may include a data share system that allows users to transmit selected measurement data to their doctors or other healthcare providers. The data share system allows users to select data sets according to time frames, for example, selecting data collected over the last month or according to data type, for example, selecting data related to pulse or beat-to-beat heart rate variability. The data share system provides an integrated system for users to share their medical data including measurement data from the hypertension therapy device 1102. Using the system, healthcare providers may readily access the collected data, perform analysis on the data, and provide a diagnosis or treatment plan.
The setting interface 1400 may include an account indicator 1402. The account indicator 1402 may indicate the account name that is currently accessing the application. In one example, the setting interface 1400 may also include a menu table 1404 which allows the user to send data via email, set up push notifications, log out from the application and close the account.
Battery 1428 may power the device. Back cover 1432 is shown in a posterior oblique view of the device with ventilation holes 1434. The ECG electrode 1432 may be used as the indifferent electrode for biosensor mode sensing the electrocardiogram. The PPG electrode 1436 may be used for acquiring the spectroscopic data for determining the blood pressure in combination with the ECG data in the biosensor mode. LCD display cover 1440 is a display that may provide the data and instructions for viewing by the user. The display changes with each of the different modes showing blood pressure measurements and other data depending upon the operating mode.
The thermoelectric module 1458 operates by the peltier effect. The peltier effect, as described previously, is the result of a temperature difference occurring from an electrical power being run between two electrodes of dissimilar materials. This principle relies on the idea that a heat current accompanies electrical current.
Typical thermoelectric modules 1458 consist of two or more n and p-type doped semiconductor materials mounted between two ceramic substrates. The ceramic substrates work to hold the overall structure together. These semiconductors are connected electrically in series and thermally in parallel. As the current is run through this junction, heat will move through the module from one side to the other by forced convection. One side of the module will absorb all the heat within the system and the other side will release it. This produces the lower and higher temperature sides respectively. The temperature difference observed in the thermoelectric module 1458 is due to the flow of electrons from the conductor that has less bound electrons to the one that has highly bound electrons. However, as an electric current continues to pass through the module, the heat that is released will start to exceed the heat absorbed. This will cause both sides to reach relatively hot temperatures and be insufficient to serve as a cooling source. Therefore, the temperature difference within the thermoelectric module 1458 must be controlled so that the lower temperature side can be used as a source for cooling.
In order to control the temperature of the lower temperature side, the thermal mass of the higher temperature side must be increased. Thus, a heat sink and cooling mechanism are used in these cooling applications as means of increasing the thermal mass of the higher temperature side of the thermoelectric module 1458. By increasing the thermal mass of the higher temperature side, it would be possible to control the lower temperature side. The lower temperature side of the thermoelectric module 1458 is in contact with the hypertension treatment device tip to act as a cold source. This allows the tip to attain its cold temperature and carry out the hypertension treatment. However, as the hypertension treatment device (and ultimately the thermoelectric module 1458) ceases operation, current stops passing through the thermoelectric module 1458 and there will no longer be a maintenance of temperature difference between the two sides. This will cause a change of temperature to be experienced, where the two sides will reach a neutral temperature. Due to the higher thermal mass of the higher temperature side as compared to the lower temperature side, this neutral temperature will be higher than that of room temperature. Thus, there would be a transfer of heat occurring from one side of the module to the other until a uniform temperature is experienced and thermal equilibrium is reached. As a result, the tip temperature will rise to be higher than room temperature. This increased temperature, however, is not ideal for continuous and consecutive hypertension treatment beyond powering of the thermoelectric module 1458. Therefore, there is the need to provide additional cooling to maintain optimal temperature conditions for effective continuous and consecutive hypertension treatment device use.
A method disclosed herein can include extended powering of the cooling mechanism to maintain optimal tip temperature for consecutive use as shown in
Appendix A shows how the present bio-sensors innovations may capture physiologic parameters from people, e.g., to send to the cloud. Such bio sensor features can analyze electocardiographic activity in combination with spectrographic (ECG and PPG signal) readings of the variation vascular capillary and analysis to yield improved test data.
This application claims benefit/priority of U.S. provisional patent application No. 62/428,460, filed Nov. 30, 2016, which is incorporated herein by reference in entirety.
Number | Date | Country | |
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62428460 | Nov 2016 | US |