Patent Application
20230147605
For many vital sign measurements such as blood oxygen saturation, a wearable biosensor is deployed that includes a sensor, a processor based system, and a screen to display the measurements. This arrangement is limited by the computational power required and display screen of the wearable biosensor to be comfortably worn by a user.
The present application overcomes the limitation of traditional wearable blood oxygen saturation monitors for continuous unobtrusive ambulatory monitoring of patient in their free-living conditions using a wearable biosensor. The present disclosure provides a solution to reduce or remove the computing processor and display for such a device while providing a better solution and at a lower cost.
In one example embodiment, a system to determine blood oxygen saturation (SpO2), includes: a finger sensor device including a sensor and a transmitter coupled to the sensor; a wrist module device communicatively connected to the finger sensor device via a cable; and a relay device communicatively connected to the wrist module device; wherein the sensor of the finger sensor device noninvasively measures changes of light absorption in oxygenated or deoxygenated blood as signal data and sends the signal data to the wrist module via the cable, wherein the wrist module receives the signal data and wirelessly sends the signal data to the relay device, wherein the relay device calculates a percentage of saturation of hemoglobin in the blood (Sp02) using the signal data, and wherein the relay device displays the calculated percentage of saturation of hemoglobin in the blood.
In another example embodiment, a method to determine blood oxygen saturation (SpO2), includes: noninvasively measuring, by a finger sensor device, changes of light absorption in oxygenated or deoxygenated blood as signal data; sending, by the finger sensor device, the signal data to a wrist module via a cable; wirelessly sending, by the wrist module device, the signal data to a relay device; calculating, by the relay device, a percentage of saturation of hemoglobin in the blood (Sp02) using the signal data; and displaying the Sp02 on a display of the relay device.
In yet another example embodiment, a biosensor device to determine blood oxygen saturation (SpO2), includes: a finger sensor coupled to a transmitter; and a wrist module communicatively connected to the finger sensor via a cable; wherein the finger sensor noninvasively measures changes of light absorption in oxygenated or deoxygenated blood as data and sends the data to the wrist module via the cable, wherein the wrist module receives the data and wirelessly sends the data to a relay device, wherein the relay device calculates a percentage of saturation of hemoglobin in the blood (Sp02) using the data, and wherein the relay device displays the calculated percentage of saturation of hemoglobin in the blood.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
In the brief description that follows, embodiments are described as illustrations only since various changes and modifications will become apparent to those skilled in the art from the following detailed description. The use of the same reference numbers in different figures indicates similar or identical items.
In the following detailed description, reference is made to the accompanying drawings, which form a part of the description. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. Furthermore, unless otherwise noted, the description of each successive drawing may reference features from one or more of the previous drawings to provide clearer context and a more substantive explanation of the current example embodiment. Still, the example embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein and illustrated in the drawings, may be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein.
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The wired sensor devices 50 may include a pulse oximeter 3 which includes a sensor/photodiode 4 and at least one of an infrared light source, red light source, multiwavelength light source, or LED light source 5, a transmitter 6, coupled to the pulse oximeter 3, and a processor 7 coupled to a memory 8. The LED 5 may include one or more LEDs. The wired sensor devices 50 may be communicatively connected via transmitter 6 to the wired wrist module device 10 via wire or cable. The wired sensor devices 50, and/or wired wrist module device 10 may also be communicatively connected to the relay device 20, and to each other, via wireless (BLE) communication. The wired sensor devices 50 may be powered by the relay device 20 via a cabled connection. The wired sensor devices 50 may further include at least a seven-day portable power source 9 such as a rechargeable or non-rechargeable battery. The pulse oximeter 3 of the wired sensor devices 50 may noninvasively measures the oxygen saturation of a patient’s blood utilizing one of two methods of SpO2 technology including transmission pulse oximetry and reflection pulse oximetry.
In an exemplary embodiment, transmissive pulse oximetry includes the photodiode 4 and the LED(s) 5 being placed on opposite sides of the human body part being measured (e.g., finger, wrist). Transmission pulse oximetry technology transmits red and infrared light from the LED(s) 5 through the body part to a photo detector (photodiode) 4. Oxygenated hemoglobin (O2Hb) and deoxygenated hemoglobin (HHb) absorb red and infrared light differently. The body tissue absorbs some of the light, and the photodiode 4 collects the residual light that passes through the body.
In another exemplary embodiment, reflective pulse oximetry includes the photodiode 4 and the LED(s) 5 being on the same side of the human body part being measured (e.g., finger or wrist). The photodiode 4 collects the light reflected from various depths underneath the skin. The pulsatile arterial blood absorbs and modulates the incident light passing through the tissue and forms the photo plethysmographic (PPG) signal. The AC component of the PPG signals represents the light absorbed by the pulsatile arterial blood. This AC component is superimposed on a DC signal that captures the effects of light absorbed by other blood and tissue components (e.g., venous and capillary blood, bone, water, etc.). The ratio of the AC signal to the DC level is called the perfusion index (PI). The DC and AC components of the received PPG signals are different for different LED wavelengths. This is due to the different absorption characteristics of HbO2, RHb, and other tissue components for different wavelengths. For example, to measure SpO2, two LEDs with different wavelengths are utilized. In addition, these two wavelengths may be selected such that the molar absorption coefficients of HbO2 and RHb are well separated. A red LED at, for example, 660 nm and an infrared LED at, for example, 880 nm are used in pulse oximetry. The pulse oximeter measures the PPG signals and the data is sent to the wired wrist module device 10 via a wire, and in turn the wired wrist module device 10 sends the PPG signal data to the relay device 20 to calculate the SpO2. Alternatively, the pulse oximeter 3 measures the PPG signals and the data is sent directly via a wireless transmitter 6 to the relay device 20 to calculate the SpO2.
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Further still, the wired wrist module device 10 may include an accelerometer 17 to detect motion artifacts. The accelerometer may include, but is not limited to, uni-axial accelerometers, bi-axial accelerometers, tri-axial accelerometers, gyroscopes, that would be within the spirit and scope of the present invention. The accelerometer of the wired wrist module device 10 may measure an analog accelerometer (ACC) signal of the user which is sent to the transmitter and in turn transmitted to the relay device 20 which subsequently utilizes the ACC signal to determine motion artifacts. The transmitter utilizes, for example, BLE wireless communication. One of ordinary skill in the art readily recognizes that the wired wrist module device 10 may utilize a variety of devices for the processor including but not limited to microprocessors, controllers, and microcontrollers and that would be within the spirit and scope of the present application. In addition, one of ordinary skill in the art readily recognizes that a variety of devices can be utilized for the memory, the application, and the transmitter and that would be within the spirit and scope of the present application.
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In an exemplary embodiment, the relay device 20 receives the PPG signal data from the wired wrist module device 10, or wireless sensor devices 60, to calculate the SpO2. The SpO2 measurement is achieved by the following equation:
where a, b, and c are calibration coefficients. Amplitudes of the absorbances are used to calculate the Red:IR Modulation Ratio (R), where R is determined by the following equation:
The AC component of the PPG signals represents the light absorbed by the pulsatile arterial blood. This AC component is superimposed on a DC signal that captures the effects of light absorbed by other blood and tissue components (e.g., venous and capillary blood, bone, water, etc.), and the ratio of the AC signal to the DC level is called the perfusion index (PI). In other words, R is a double-ratio of the pulsatile and non-pulsatile components of red-light absorption to IR light absorption. Regarding the calibration coefficients a, b, and c, a calibration process obtains calibration coefficients for better measurement accuracy by compensating for the deviations from the Beer-Lambert law and the non-idealities of the hardware. These coefficients may be obtained after collecting comprehensive data in a calibration lab, and using regression methods, fit a second (or first) order curve to the collected data. The fitted calibration curve is used to output the required calibration coefficients a, b, and c, calibration coefficients.
The computed underlying vital signs, including Sp02, are then displayed on the relay device 20 to report the results. Therefore, the use of the tablet, smart phone, or computer rather than including a display screen on the wired wrist module device 10, wired finger sensor device 1 and/or wired fingertip sensor device 2, or the wireless sensor devices 60, reduces cost and size, while providing a much higher computing processor power and far better display to report the result. Furthermore, the relay device 20 may be used to transmit the information to a central monitoring system that can further enhance the measurement, notify caregiver or interested parties and control the schedule and parameters of the measurement or the algorithm. By incorporating a small and inexpensive Bluetooth (or similar) module with the wired wrist module device 10, wired finger sensor device 1 and/or wired fingertip sensor device 2, or the wireless sensor devices 60, the raw signal is transmitted to the relay device 20. The relay device 20 then carries out all the necessary computations, displays the data on its screen and/or transmits the data to a central monitoring station.
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From the foregoing, it will be appreciated that various embodiments of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Further, one of ordinary skill in the art would understand that the various embodiments may be combined or separated, and is within the possession of, consideration of, and contemplation of the inventors to combine various embodiments. Accordingly, the various embodiments disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
One skilled in the art will appreciate that, for this and other processes and methods disclosed herein, the functions performed in the processes and methods may be implemented in differing order. Furthermore, the outlined steps and operations are only provided as examples, and some of the steps and operations may be optional, combined into fewer steps and operations, or expanded into additional steps and operations without detracting from the essence of the disclosed embodiments.
Furthermore, the present disclosure is not to be limited in terms of the particular embodiments described in this application, which are intended as illustrations of various aspects. Many modifications and variations can be made without departing from its spirit and scope, as will be apparent to those skilled in the art. Functionally equivalent methods and even apparatuses within the scope of the disclosure, in addition to those enumerated herein, will be apparent to those skilled in the art from the foregoing descriptions. Such modifications and variations are intended to fall within the scope of the appended claims. The present disclosure is to be limited only by the terms of the appended claims, along with the full scope of equivalents to which such claims are entitled. It is to be understood that this disclosure is not limited to particular methods, reagents, compounds, compositions or biological systems, which can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
There is little distinction left between hardware and software implementations of aspects of the above described systems; the use of hardware or software is generally (but not always, in that in certain contexts the choice between hardware and software can become significant) a design choice representing cost vs. efficiency tradeoffs. There are various vehicles by which processes and/or systems and/or other technologies described herein may be implemented, e.g., hardware, software, and/or firmware, and that the preferred vehicle may vary with the context in which the processes and/or systems and/or other technologies are deployed. For example, if an implementer determines that speed and accuracy are paramount, the implementer may opt for a mainly hardware and/or firmware vehicle; if flexibility is paramount, the implementer may opt for a mainly software implementation; or, yet again alternatively, the implementer may opt for some combination of hardware, software, and/or firmware.
The foregoing detailed description has set forth various embodiments of the devices and/or processes for determining blood oxygen saturation via the use of block diagrams, flowcharts, and/or examples. Insofar as such block diagrams, flowcharts, and/or examples contain one or more functions and/or operations, it will be understood by those within the art that each function and/or operation within such block diagrams, flowcharts, or examples can be implemented, individually and/or collectively, by a wide range of hardware, software, firmware, or virtually any combination thereof. In one embodiment, several portions of the subject matter described herein may be implemented via Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), digital signal processors (DSPs), or other integrated formats. However, those skilled in the art will recognize that some aspects of the embodiments disclosed herein, in whole or in part, can be equivalently implemented in integrated circuits, as one or more computer programs running on one or more computers (e.g., as one or more programs running on one or more computer systems), as one or more programs running on one or more processors (e.g., as one or more programs running on one or more microprocessors), as firmware, or as virtually any combination thereof, and that designing the circuitry and/or writing the code for the software and or firmware would be well within the skill of one of skill in the art in light of this disclosure. In addition, those skilled in the art will appreciate that the mechanisms of the subject matter described herein are capable of being distributed as a program product in a variety of forms, and that an illustrative embodiment of the subject matter described herein applies regardless of the particular type of signal bearing medium used to actually carry out the distribution. Examples of a signal bearing medium include, but are not limited to, the following: a recordable type medium, a hard disk drive, a computer memory, etc.; and a transmission type medium such as a digital and/or an analog communication medium (e.g., a fiber optic cable, a waveguide, a wired communications link, a wireless communication link, etc.).
Those skilled in the art will recognize that it is common within the art to describe devices and/or processes in the fashion set forth herein, and thereafter use engineering practices to integrate the devices and/or processes described herein into data processing systems. That is, at least a portion of the devices and/or processes described herein can be integrated into a data processing system via a reasonable amount of experimentation. Those having skill in the art will recognize that a typical data processing system generally includes one or more of a system unit housing, a video display device, a memory such as volatile and non-volatile memory, processors such as microprocessors and digital signal processors, computational entities such as operating systems, drivers, graphical user interfaces, and applications programs, one or more interaction devices, such as a touch pad or screen, and/or control systems including feedback loops and control motors (e.g., feedback for sensing position and/or velocity; control motors for moving and/or adjusting components and/or quantities). A typical data processing system may be implemented utilizing any suitable commercially available components, such as those typically found in data computing/communication and/or network computing/communication systems.
The herein described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively “associated” such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as “associated with” each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being “operably connected”, or “operably coupled”, to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being “operably couplable”, to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to embodiments containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an,” e.g., “a” and/or “an” should be interpreted to mean “at least one” or “one or more;” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of “two recitations,” without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “ a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “ a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.
From the foregoing, it will be appreciated that various embodiments of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various embodiments disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
