WO2022045872A1 - A system for calibrating medical devices and its method - Google Patents
A system for calibrating medical devices and its method Download PDFInfo
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- WO2022045872A1 WO2022045872A1 PCT/MY2020/050152 MY2020050152W WO2022045872A1 WO 2022045872 A1 WO2022045872 A1 WO 2022045872A1 MY 2020050152 W MY2020050152 W MY 2020050152W WO 2022045872 A1 WO2022045872 A1 WO 2022045872A1
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- medical devices
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005457 optimization Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 11
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 27
- 239000008103 glucose Substances 0.000 claims description 27
- 238000010200 validation analysis Methods 0.000 claims description 12
- 230000003595 spectral effect Effects 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000004611 spectroscopical analysis Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 5
- 239000008280 blood Substances 0.000 description 7
- 210000004369 blood Anatomy 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 206010012601 diabetes mellitus Diseases 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004497 NIR spectroscopy Methods 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 206010052428 Wound Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
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- 230000008733 trauma Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H40/00—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices
- G16H40/40—ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the management of medical equipment or devices, e.g. scheduling maintenance or upgrades
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1495—Calibrating or testing of in-vivo probes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N20/00—Machine learning
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N5/00—Computing arrangements using knowledge-based models
- G06N5/01—Dynamic search techniques; Heuristics; Dynamic trees; Branch-and-bound
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors
- A61B2560/0228—Operational features of calibration, e.g. protocols for calibrating sensors using calibration standards
- A61B2560/0233—Optical standards
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0075—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/14532—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring glucose, e.g. by tissue impedance measurement
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/60—Software deployment
- G06F8/65—Updates
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/70—Software maintenance or management
Definitions
- the invention relates to a system for calibrating medical devices. More particularly, the invention relates to a system for calibrating medical devices from a remote server and method thereof.
- diabetic patients may need to prick their fingers and test their blood glucose levels several times a day.
- Such a method is not beneficial to these patients as their blood circulation is slower than a healthy person and this affects the process to deliver nutrients to wounds.
- the injuries caused by pricking heal slowly, or may not heal at all.
- the slow recovering injuries can also increase the risk of infections and other complications to these patients. Therefore, a new technique called non-invasive glucose monitoring is introduced to measure of blood glucose levels for diabetic patients without drawing blood, puncturing the skin, or causing pain or trauma.
- One of the issues is variation across multiple optical spectroscopy instruments during measurement of a sample.
- the variation may be caused by various factors such as interference of external light source or defected components of the optical spectroscopy instrument.
- the existing monitoring system has a low signal-to-noise ratio that causes variation in a prediction algorithm for determining the blood glucose level.
- US6517482B1 discloses a method and apparatus for non- invasively determining glucose levels in a fluid of a subject, typically the blood glucose level.
- the impedance of skin tissue is measured and the measurement is used with impedance measurements previously correlated with directly determined glucose levels to determine the glucose level from the newly measured impedance. It is thus possible, to routinely non-invasively determine fluid glucose levels.
- US9336353B2 discloses a system and method for communicating glucose concentration information between devices of a continuous glucose monitoring system.
- the continuous glucose monitoring system can include a sensor module generates a glucose concentration measurement data and transmits the data to one or more further devices of the continuous glucose monitoring system.
- the further devices can include a receiver unit and one or more secondary display devices.
- the receiver unit can be configured to be a stand-alone device of or physically connect to a secondary display device.
- a user interface can also be provided that provides enhanced functionality for using the continuous glucose monitoring system.
- One object of the invention is to enable calibration of faulty medical devices from a remote server with a master-slave configuration.
- Another object of the invention is to ensure measurement consistency of the medical devices by standardizing a measurement of slave devices with reference to a master device.
- the invention provides a system for calibrating medical devices comprising a server in communication with a plurality of medical devices, in which the server having a central processing module for facilitating data communication among a plurality of modules connected thereto, the modules comprising a multiple management calibration module for differentiating between non-faulty medical devices and faulty medical devices from the plurality of medical devices based on one predetermined threshold; a variation standardization module for assigning one non-faulty medical device as a master device and other medical devices as slave devices that are configured to receive updates from the master device, where the master device is used as a reference to compute variation between the master device and the slave devices; and an optimization module for optimizing a learning model based on the computed variation; wherein the variation standardization module updates the master device based on the optimized learning model such that the slave devices are standardized according to the master device and thereby ensuring measurement consistency among the medical devices.
- the multiple management calibration module compares a measurable quantity of a sample retrieved from the medical devices to the predetermined threshold to determine if the measureable quantity has deviated away from the predetermined threshold beyond a tolerance.
- the multiple management calibration module further computes the tolerance between the predetermined threshold with the measurable quantity into a binary data for processing by the variation standardization module.
- the variation standardization module computes the variation by comparing the measurable quantity of the master device to the measurable quantity of slave devices.
- the optimization module carries out spectral pretreatment to remove noise from the computed variation.
- the spectral pretreatment includes a generalized least-square regression, multiplicative scatter correction or scaling.
- the optimization module classifies the variation based on one hot encoding into its respective class indicative of a range of the variation.
- the optimization module optimizes the learning model iteratively for each class for validation of the learning model based on a set of validation data associated to that class.
- the medical devices is in the form of an optical spectroscopy instrument for measuring a glucose level of a subject via near spectroscopic field infrared technique.
- a method for calibrating medical device comprising the steps of differentiating, by a multiple management calibration module, between non-faulty medical devices and faulty medical devices from a plurality of medical devices based on one predetermined threshold; assigning, by a variation standardization module one non-faulty medical device as a master device and other medical devices as slave devices that are configured to receive updates from the master device, where the master device is used as a reference to compute variation between the master device and the slave devices; optimizing, by an optimization module, a learning model based on the computed variation; updating, by the variation standardization module, the master device based on the optimized learning model; and standardizing the slave devices according to the master device and thereby ensuring measurement consistency among the medical devices.
- the method further comprises the step of comparing, by the multiple management calibration module, a measurable quantity of a sample retrieved from the medical devices to the predetermined threshold to determine if the measureable quantity has deviated away from the predetermined threshold beyond a tolerance.
- the method further comprises the step of computing, by the multiple management calibration module, the tolerance between the predetermined threshold with the measurable quantity into a binary data for processing by the variation standardization module.
- the method further comprises the step of computing, by the variation standardization module, the variation by comparing the measurable quantity of the master device to the measurable quantity of slave devices.
- the method further comprises the step of carrying out, by the optimization module, spectral pretreatment to remove noise from the computed variation.
- the spectral pretreatment includes a generalized least-square regression, multiplicative scatter correction or scaling.
- the method further comprises the step of classifying, by the optimization module, the variation based on one hot encoding into its respective class indicative of a range of the variation.
- the method further comprises the step of optimizing, by the optimization module, the learning model iteratively for each class for validation of the learning model based on a set of validation data associated to that class.
- the medical devices is in the form of an optical spectroscopy instrument for measuring a glucose level of a subject via near spectroscopic field infrared technique.
- Fig. 1 is a diagram illustrating a system for calibrating medical devices.
- Fig. 2 is a table illustrating a computation process for binary data.
- Fig. 3 is a table illustrating a classification process for the variation based on one hot encoding.
- Fig. 4 is a flow chart to illustrating a method for calibrating medical devices. DETAILED DESCRIPTION OF THE INVENTION
- These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer- readable memory produce an article of manufacture including instruction means that implement the fimction/act specified in the flowchart and/or block diagram block or blocks.
- the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus provide steps for implementing the fimctions/acts specified in the flowchart and/or block diagram block or blocks.
- the term “medical devices” refers to an optical spectroscopy instrument for measuring a sample of a subject, such as glucose.
- the medical devices may employ the technology of bioimpedance spectroscopy, microwave/RF sensing, fluorescence technology, mid-infrared spectroscopy, near infrared spectroscopy, optical coherence tomography, optical polarimetry, Raman spectroscopy, reverse iontophoresis or ultrasound technology.
- master device and “slave device” are used to indicate a master-slave configuration of the medical devices 6, which is a model of communication for medical devices 6 where one device has a unidirectional control over one or more devices. This is often used in the electronic hardware space where one device acts as the controller, whereas the other devices are the ones being controlled.
- the system comprises a server 1 in communication with a plurality of medical devices 6, in which the server 1 having a central processing module 2 for facilitating data communication among a plurality of modules connected thereto.
- the system is suitable for calibrating the medical devices 6 from the server 1 that is placed in a remote area.
- a supplier may install the medical devices 6 in a hospital while the supplier may then calibrate the medical devices 6 through the server 1 from their office located away from the hospital.
- the calibration of the medical devices 6 from the server 1 can be done wirelessly or with wired communication.
- the medical devices 6 is a form of non-invasive medical device 6 such as an optical spectroscopy instrument for measuring a glucose level of a subject via near spectroscopic field infrared technique.
- the modules comprises a multiple management calibration module 3, a variation standardization module 4 and an optimization module 5, in which the data communication of these modules are controlled by the central processing module 2.
- the multiple management calibration module 3 is configured to differentiate between non-faulty medical devices 6 and faulty medical devices 6 from the plurality of medical devices 6 through calibration of the medical devices 6.
- the medical devices 6 are provided with a same sample so that the medical devices 6 obtains a measurable quantity pertaining to the sample.
- the measureable quantity and the sample refer to glucose level and blood sample of a subject respectively.
- the medical devices 6 detects the measureable quantity through near spectroscopic field infrared technique so that the subject does not have to receive injection to draw the blood sample.
- the multiple management calibration module 3 may also be inputted with multiple predetermined thresholds, where a suitable predetermined threshold is selected pertaining to the measurable quantity of the sample.
- the multiple management calibration module 3 selects the predetermined threshold which is indicative of an actual reading of the subject’s glucose level.
- the multiple management calibration module 3 compares the measurable quantity of the sample retrieved from the medical devices 6 to the predetermined threshold to determine if the measureable quantity has deviated away from the predetermined threshold beyond a tolerance.
- the comparison is conducted through identifying a peak-to-peak ratio of the measurable quantity with its predetermined threshold and the tolerance is used to determine if the peak-to-peak ratio has exceeded an allowable deviation. If the peak-to-peak ratio has exceeded the tolerance, this implies that the medical devices 6 are faulty and unable to obtain an accurate reading of the measurable quantity. If the peak-to-peak ratio is within the tolerance, this implies that the medical devices 6 are not faulty and able to obtain an accurate reading of the measurable quantity.
- the tolerance is set at a conservative value of 0.95 of the predetermine threshold.
- the multiple management calibration module 3 conducts calibration with poly-spectrum-analysis that uses white tiles as the predetermined threshold.
- the comparison is conducted through comparing the measurable quantity with the white tiles and a tolerance is used to determine if the differences between the measurable quantity and the white tiles have exceeded an allowable deviation. If the differences have exceeded the tolerance, this implies that the medical devices 6 are faulty and unable to obtain an accurate reading of the measurable quantity. If the differences are within the tolerance, this implies that the medical devices 6 are not faulty and able to obtain an accurate reading of the measurable quantity.
- the tolerance is set at a conservative value of 0.98 of the white tiles.
- the multiple management calibration module 3 further computes the tolerance between the predetermined threshold with the measurable quantity into a binary data for processing by the variation standardization module 4. If the medical devices 6 are determined as faulty medical devices 6, a binary data of 0 is to be returned to the central processing module 2, which is also deemed as fail. If the medical devices 6 are determined as non-faulty devices, a binary data of 1 is to be returned to the central processing module 2, which is also deemed as pass. In a more preferred embodiment, a combination of binary data of the two comparison method is transferred as an output to the central processing module 2 so that noisy data is excluded from the calibration process and a more informative data can be obtained.
- the central processing module 2 if all the binary data received by the central processing module 2 is 1, the central processing module 2 then initiates the optimization module 5 as none of the medical devices 6 is faulty. However, if the a binary data of 0 is received by the central processing module 2, the central processing module 2 then initiates the variation standardization module 4 to process the binary data for identification of variation.
- the variation standardization module 4 is configured to establish a masterslave configuration for the medical devices 6 based on the binary data.
- the variation standardization module 4 assigns one non-faulty medical device 6 as a master device and other medical devices 6 as slave devices that are configured to receive updates from the master device. This is to enable the master device as a reference for computing variation between the master device and the slave devices.
- the slave devices may be faulty medical devices 6 or a combination of faulty medical devices 6 and non-faulty medical devices 6.
- the variation standardization module 4 computes the variation by comparing the measurable quantity of the master device to the measurable quantity of slave devices such that the variation standardization module 4 identifies the difference in measurement of the slave devices from the master device. The variation is then transferred to the optimization module 5 for further processing.
- the optimization module 5 is configured to optimize a learning model based on the computed variation.
- the optimization module 5 is preferred to carry out spectral pretreatment to remove noise from the computed variation.
- the spectral pretreatment includes a generalized least-square regression, multiplicative scatter correction or scaling.
- the optimization module 5 classifies the variation based on one hot encoding into its respective class indicative of a range of the variation as depicted in Fig. 3.
- the range of the variation is high glucose level, middle glucose level and low glucose level.
- the one hot encoding converts the classified variations into a form that could be provided to the learning model to enhance the model’s predictive ability.
- the optimization module 5 may generate a learning model for each class and optimizes the learning model iteratively for each class for validation of the learning model based on a set of validation data associated to that class.
- the learning model is optimized until a best model with high correlation coefficient and lowest value of error is acquired.
- the learning model is a specific regression model.
- the optimization module 5 transfers the optimized learning model to the central processing module 2.
- the variation standardization module 4 updates the master device based on the optimized learning model from the central processing module 2 such that the slave devices are standardized according to the master device and thereby ensuring measurement consistency among the medical devices 6. This eliminates the need to update each medical device 6 with a different learning model as the slave devices only have to calibrate themselves according to the updates received by the master device.
- the variation standardization module 4 may transfer the optimized learning model to the master device such that the optimized learning model updates a measurement algorithm within the master device and the slave device then fine-tunes its respective measurement algorithm accordingly. This ensures the slave devices have a same measurement accuracy with the master device, therefore ensuring measurement consistency for all the medical devices 6.
- the central processing module 2 may also transmit the data pertaining to the medical devices 6 to an electronic device.
- the data may also include temperature of the subject and environmental data.
- the electronic devices may be a personal digital assistant (PDA), a smart phone, a tablet, a laptop, a netbook, a phablet, a computer or any suitable means which is capable of receiving inputs from the server 1.
- PDA personal digital assistant
- a smart phone a tablet, a laptop, a netbook, a phablet, a computer or any suitable means which is capable of receiving inputs from the server 1.
- the multiple management calibration module 3 differentiates between non-faulty medical devices 6 and faulty medical devices 6 from a plurality of medical devices 6 based on one predetermined threshold.
- the multiple management calibration module 3 compares a measurable quantity of a sample retrieved from the medical devices 6 to the predetermined threshold to determine if the measureable quantity has deviated away from the predetermined threshold beyond a tolerance.
- the multiple management calibration module 3 computes the tolerance between the predetermined threshold with the measurable quantity into a binary data for processing by the variation standardization module 4.
- the variation standardization module 4 assigns one non-faulty medical device 6 as a master device and other medical devices 6 as slave devices that are configured to receive updates from the master device, where the master device is used as a reference to compute variation between the master device and the slave devices.
- the variation standardization module 4 computes the variation by comparing the measurable quantity of the master device to the measurable quantity of slave devices.
- the variation standardization module 4 transfers the computed variation to the optimization module 5.
- the optimization module 5 carries out spectral pretreatment to remove noise from the computed variation.
- the optimization module 5 classifies the variation based on one hot encoding into its respective class indicative of a range of the variation.
- the optimization module 5 optimizes a learning model iteratively for each class for validation of the learning model based on a set of validation data associated to that class.
- the master device is updated based on the optimized learning model for standardizing the slave devices accordingly and thereby ensuring measurement consistency among the medical devices 6.
Abstract
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2020
- 2020-11-16 WO PCT/MY2020/050152 patent/WO2022045872A1/en active Application Filing
- 2020-11-16 AU AU2020465148A patent/AU2020465148A1/en active Pending
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