System and driving method for determining position of nasogastric tube in body

Abstract

According to one embodiment of the present invention, the device may include a magnetic field sensing unit that detects a magnetic field generated from a nasogastric tube equipped with a magnet, a sensor correction unit that determines the position of a magnetic field sensing sensor according to the model of the user terminal, a position determination unit that determines the insertion position by measuring the strength of the magnetic field generated from a nasogastric tube inserted into the patient's body, and an output unit that outputs the insertion position in a visual or acoustic manner.

Description

Technology Field

[0001] The present invention relates to a user terminal system for determining the position of a nasogastric tube within the body and a method for operating the same. Background Technology

[0002] Implantable gastrointestinal devices are used not only in hospital settings but also in long-term care and home nursing situations, leading to persistent technical demands regarding safety and judgment accuracy. In particular, a structure capable of rapidly identifying and transmitting the positional status of the device in various environments is recognized as a necessary element for both medical professionals and general users. Accordingly, technical approaches that operate in conjunction with user devices and include positional judgment functions that account for repetitive situations and differences among users are gaining attention. Traditionally, auditory, image-based, or manual measurement methods were primarily utilized; however, these technologies were often suitable only for limited situations due to dependence on external equipment, judgment delays, and variations in the proficiency of medical staff. Furthermore, uncertainty in result interpretation can arise depending on the individual user's physical structure, physiological composition, and body type, and there is a lack of adaptive structures that utilize history even when the same device is used repeatedly. Consequently, there is a demand for a technical structure that reflects diverse usage conditions and individual physical characteristics, operates stably even with repeated use, and can intuitively convey the positional status.

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[0007] delete The problem to be solved

[0008] The problem that the present invention aims to solve is to provide a user terminal system capable of accurately determining the insertion location of a nasogastric tube within the body using a position determination algorithm by detecting a magnetic field generated from a nasogastric tube equipped with a magnet and correcting the position of the magnetic field detection sensor of the user terminal and the sensed magnetic field strength. Another problem is to propose a method that can rapidly determine the insertion location of a nasogastric tube within the body and provide it intuitively to the user through a position determination algorithm that reflects situations involving repeated insertion or replacement of the nasogastric tube and various patient physical characteristics.

[0009] delete means of solving the problem

[0010] According to one embodiment of the present invention, the device may include a magnetic field detection unit that detects a magnetic field generated from a nasogastric tube equipped with a magnet, a sensor correction unit that determines the location of a magnetic field detection sensor according to the model of the user terminal, a location determination unit that determines the insertion location by measuring the strength of the magnetic field generated from the nasogastric tube inserted into the patient's body, and an output unit that outputs the insertion location in a visual or acoustic manner. According to one embodiment of the present invention, the magnetic field detection unit may be configured to continuously detect a magnetic field generated from a nasogastric tube located outside the body at a plurality of locations along the movement path of the user terminal and to measure the magnetic field strength for each location. According to one embodiment of the present invention, the sensor correction unit may determine the location where the maximum value among the measured magnetic field strengths is detected as the location of the magnetic field detection sensor within the user terminal. According to one embodiment of the present invention, the output unit may visually output the three-dimensional location of the magnetic field detection sensor determined by the sensor correction unit on the user terminal. According to one embodiment of the present invention, the sensor correction unit sets the magnetic field strength having the maximum value as a reference magnetic field strength, and the location determination unit [determines] the reference magnetic field strength and the magnetic field of the nasogastric tube inserted into the patient's body The insertion location within the body can be determined by comparing and analyzing the strength. According to one embodiment of the present invention, the position determination unit can perform a position determination algorithm for determining the insertion location of a nasogastric tube within the body by using the magnetic field strength having a maximum value, the location of a magnetic field sensing sensor, and information on the patient's body characteristics as input values. According to one embodiment of the present invention, the position determination unit can perform a position determination algorithm for the same patient based on the magnetic field strength corresponding to the maximum value, the determined location of the magnetic field sensing sensor, and information on the body characteristics.According to one embodiment of the present invention, a position determination unit accumulates magnetic field strength corresponding to a maximum value, the location of a determined magnetic field sensing sensor, and body characteristic information for a plurality of patients under a secure environment, and performs a position determination algorithm based on the accumulated data to determine the insertion location of a nasogastric tube within the body according to the body characteristics of each patient. According to one embodiment of the present invention, a magnetic field generated from a nasogastric tube is detected by a magnetic field sensing unit, the location of a magnetic field sensing sensor for each model of a user terminal is determined based on the magnetic field strength by a sensor correction unit, the insertion location of the nasogastric tube within the body is determined by measuring the magnetic field strength generated from the nasogastric tube inserted into the patient's body by a position determination unit, and the insertion location can be output in a visual or auditory manner by an output unit. According to one embodiment of the present invention, a computer-readable non-transient recording medium may be included, on which a program for executing a method of driving a user terminal system for determining the location of a nasogastric tube within the body is recorded.

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[0019] delete Effects of the invention

[0020] According to the present invention, by detecting the magnetic field of a nasogastric tube equipped with a magnet, normalizing the position and magnetic field strength of the magnetic field detection sensor of a user terminal, and automatically determining the insertion position of the nasogastric tube within the body through a position determination algorithm, it is possible to improve judgment accuracy and expedite the position verification procedure. Furthermore, judgment precision is enhanced through a judgment structure that can reflect the individual patient's physical characteristics or history of repeated insertion, and intuitive user guidance can be provided in various usage environments. As a result, not only medical personnel but also general users who are non-experts can easily perform the process of determining the position of the nasogastric tube within the body without the need for separate equipment or advanced skills.

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[0022] delete Brief explanation of the drawing

[65535] FIG. 1 is an overall block diagram of a user terminal system for determining the location of a nasogastric tube within the body according to an embodiment of the present disclosure. FIG. 2 and FIG. 3 are diagrams illustrating the structure of a nasogastric tube equipped with a magnet according to an embodiment of the present disclosure. FIG. 4 is a diagram illustrating the process of determining the location of a magnetic field sensing sensor by model of a user terminal according to an embodiment of the present disclosure. FIG. 5 is a diagram illustrating an example of an interface including the location of a magnetic field sensing sensor output on a user terminal according to an embodiment of the present disclosure. FIG. 6 is a diagram illustrating the process of determining the location of a nasogastric tube inserted within the body according to an embodiment of the present disclosure. FIG. 7 is a diagram illustrating the operational structure of a location determination algorithm based on repetitive insertion or various patient data according to an embodiment of the present disclosure. FIG. 8 is a diagram illustrating an example of an interface of a user terminal that outputs the insertion location in a visual or auditory manner according to an embodiment of the present disclosure. FIG. 9 is a flowchart for explaining the operation method of a user terminal system for determining the location of a nasogastric tube within the body according to an embodiment of the present disclosure. Specific details for implementing the invention

[0024] Hereinafter, various embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description have been omitted, and the same reference numerals are assigned to identical or similar components throughout the specification. Accordingly, the reference numerals described above may also be used in other drawings. Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is depicted. Thickness may be exaggerated in the drawings to clearly represent various layers and regions. Additionally, the expression "identical" in the description may mean "substantially identical." That is, it may be identical to the extent that a person skilled in the art can accept that they are identical. Other expressions may also be expressions in which "substantially" is omitted. Furthermore, when a part in the description is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. As used in this specification, "part" refers to a unit that processes at least one function or operation, and may, for example, mean software, FPGA, or hardware components. The function provided by the "part" may be performed separately by multiple components or integrated with other additional components. The "part" in this specification is not necessarily limited to software or hardware, and may be configured to reside in an addressable storage medium or configured to run one or more processors. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.FIG. 1 is an overall block diagram of a user terminal system for determining the position of a nasogastric tube within the body according to an embodiment of the present disclosure. Referring to FIG. 1, the user terminal system (1) for determining the position of a nasogastric tube within the body according to the present embodiment may include a magnetic field detection unit (11) for detecting a magnetic field generated from a nasogastric tube (10, see FIG. 2), a sensor correction unit (12) for determining the position of a magnetic field detection sensor according to the model of the user terminal (1') and normalizing the magnetic field strength, a position determination unit (13) for determining the insertion position of the nasogastric tube within the body by detecting the strength of the magnetic field generated from the nasogastric tube (10) inserted into the patient's body, and an output unit (14) for outputting the insertion position of the nasogastric tube (10) within the body in a visual or auditory manner. However, in the user terminal system (1) for determining the position of a nasogastric tube within the body according to the present embodiment, some of the components shown in FIG. 1 may be omitted or added, which implies that various modifications and changes are possible within the scope of the technical concept of the present invention. The sensing unit (11) may be configured to detect a magnetic field generated from a magnet or metal body (132, see FIG. 2) provided at one end of the nasogastric tube (10). The magnetic field sensing unit (11) may be linked with a single or multiple magnetic field sensing sensors integrated into the user terminal (1'), and as the user terminal (1') moves along the patient's body, it may detect magnetic fields at multiple locations and continuously measure the magnetic field strength. The magnetic field sensing unit (11) performs an initial measurement while the nasogastric tube (10) is located outside the patient's body, and the measurement result is transmitted to the sensor calibration unit (12) to be used to determine the accurate location of the magnetic field sensing sensor within the user terminal (1'). The magnetic field sensing unit (11) may continuously detect the magnetic field and continuously measure the magnetic field strength even after the nasogastric tube (10) is inserted inside the patient's body, and these real-time measurements may be provided as a basis for judgment by the location determination unit (13).Magnetic field signals collected from multiple directions, including multiple sensing nodes, can be filtered according to a directionality correction algorithm, for example, and a noise removal function to reduce signal interference can also be performed. The sensor correction unit (12) can determine the location where the maximum value is detected among the multiple magnetic field strength measurements transmitted by the magnetic field sensing unit (11) as the accurate location of the magnetic field sensing sensor within the user terminal (1'). That is, since the location of the built-in magnetic field sensing sensor may differ depending on the model of the user terminal (1'), the sensor correction unit (12) can inversely calculate the location of the magnetic field sensing sensor within the user terminal (1') based on the coordinates at the time when the maximum magnetic field strength was recorded. The sensor correction unit (12) can minimize the error between models of the user terminal (1') by setting the maximum magnetic field strength as the reference magnetic field strength and then normalizing the magnetic field strength measured by the magnetic field sensing sensor according to the reference magnetic field strength. The normalized magnetic field strength is a common comparison standard to be used for judgment after insertion of the nasogastric tube (10) into the body, and the location This can serve as a basis for enabling a comparison of relative strengths in the judgment unit (13). At this time, the sensor correction unit (12) may refer to predefined magnetic field sensor location information within the user terminal (1') or utilize an error correction table generated based on sensor mapping information automatically recognized through the user terminal (1') sensor identification API. The position judgment unit (13) can precisely determine the insertion position of the nasogastric tube (10) into the body based on the reference magnetic field strength provided by the sensor correction unit (12) and the magnetic field detection sensor location information of the user terminal (1'). The position judgment unit (13) can determine the current accurate position of the nasogastric tube (10) within the body by tracking changes in magnetic field strength that are continuously detected after the insertion of the nasogastric tube (10) and comparing and analyzing how much this strength value differs from the reference magnetic field strength.The position determination unit (13) can perform a position determination algorithm that comprehensively considers magnetic field strength, direction, rate of change over time, and detection coordinates. Input values ​​may include reference magnetic field strength, real-time magnetic field strength, magnetic field detection sensor location coordinates, detection time, and information on the patient's physical characteristics (e.g., body shape, organ position error, skeletal structure, etc.), but the present invention is not limited thereto. Additionally, the position determination unit (13) can perform the position determination algorithm based on the past insertion history of the same patient, which can be utilized when the nasogastric tube (10) is inserted or replaced multiple times in the same patient. Furthermore, the position determination unit (13) can accumulate datasets collected from multiple patients within a secure environment and utilize them to form a position determination structure that reflects physical characteristics according to various body types, ages, genders, nationality conditions, etc. This model can be operated in parallel with the aforementioned personalized model and may have a structure that allows the judgment algorithm to be dynamically replaced or adjusted depending on the situation. The output unit (14) can perform the role of intuitively guiding the user based on the insertion position coordinate data of the nasogastric tube (10) within the body received from the position judgment unit (13). The output unit (14) can display real-time location information in the form of a map on the GUI of the user terminal (1') or visually display the distance and relative direction. In addition, acoustic feedback is possible along with visual output; for example, when the insertion of the nasogastric tube (10) within the body reaches an appropriate position, it can generate a specific voice or provide a notification via vibration. The output unit (14) may also output integrated complex information including the reliability of the currently determined position, similarity to past insertion positions, and the degree of error compared to a reference position. Through this output, the user can determine the nasogastric tube insertion situation in real time without separate complex equipment, and can provide an environment that can be utilized by general users who are not medical professionals.According to the configuration illustrated in FIG. 1, a user terminal system (1) for determining the position of a nasogastric tube within the body can detect a magnetic field generated from a magnet or metal body (132) provided in the nasogastric tube (10), and can perform a series of processes including a preliminary determination before insertion, a real-time determination after insertion, and a position analysis using a position determination algorithm. Each component (11, 12, 13, 14) can be implemented as a hardware or software module and can be arranged in a structure that is independent or mutually communicable within the system (1). In addition, depending on the model of the user terminal (1'), sensor placement, and insertion situation, selective configuration or functional combination is possible, and flexible operation is possible in various environments. FIGS. 2 and FIGS. 3 are drawings illustrating the structure of a nasogastric tube equipped with a magnet according to an embodiment of the present disclosure. FIG. 2 is a side view illustrating the overall external shape of the nasogastric tube (10), and FIG. 3 is an enlarged view of the inlet section (130) area of ​​the nasogastric tube (10). The nasogastric tube (10) is a tube-shaped device that is inserted through the patient's nose, passes through the pharynx and esophagus, and is inserted into the stomach. In this embodiment, the nasogastric tube (10) may include a tube (110), an injection section (120), and an inlet section (130), and a metal body (132, magnet) may be placed at one end of the inlet section (130) to serve as a reference point for determining the insertion position within the body. The tube (110) may be formed from flexible rubber, silicone, or polymer composite materials, and is structured to be inserted into the patient's stomach or organ. The tube (110) may be made of a material that is acid-resistant and biocompatible to withstand the physiological environment inside the esophagus and stomach. The tube (110) may be configured to have sufficient flexibility to minimize irritation when passing through the nasal cavity and pharynx upon insertion. The injection part (120) is configured to be connected to the other end of the tube (110) and may form a connection exposed to the outside of the nasal cavity for injecting nutrients or drugs.The injection part (120) may include a stopper (121), and the stopper (121) is configured to be openable and closable by a user and can perform a sealing function for hygiene and backflow prevention. The injection part (120) may be equipped with an external connector (not shown) to be connected to a syringe, pouch, or pump-type storage container. The inlet part (130) is positioned at one end of the tube (110) and may be an area inserted into the stomach of a patient. The inlet part (130) may include an inlet hole (131) for releasing drugs, food, nutrients, etc., introduced from the injection part (120) into the stomach of the patient. The inlet hole (131) may be formed with a plurality of openings through which fluid can pass and may include a filter structure to prevent blockage or backflow. Additionally, a metal body (132) may be positioned at the bottom of the inlet part (130), that is, below the inlet hole (131). In one embodiment, a metal body (132) may be mounted on the tip of the inlet section (130) of the nasogastric tube (10). At this time, the inlet section (130) may be further provided with a separator (133, see FIG. 3) that separates the inlet hole (131) and the metal body (132) from each other so that food or medication does not come into direct contact with the metal body (132). The separator (133) may be formed from a material that is non-conductive and biocompatible, such as silicone, for example, and has excellent acid and chemical resistance so that deformation or damage can be minimized even during long-term use. Accordingly, the separator (133) can prevent medication, food, or nutrients injected into the patient's stomach through the inlet hole (131) from being contaminated or electrically affected by the metal body (132). In addition, the metal body (132) may have a weight that ensures positional stability, but may have a lightweight structure that does not cause physical damage to the stomach wall or organs. 4 is a diagram illustrating the process of determining the location of a magnetic field sensor for each model of a user terminal according to one embodiment of the present disclosure.This process is performed before the nasogastric tube (10) is inserted into the patient's body and may include a procedure to calculate the exact location of a magnetic field detection sensor embedded in the user terminal (1') by detecting a magnetic field radiated from a metal body (132) placed at the shortest end of the inlet (130) of the nasogastric tube (10). Since the location, placement direction, and internal circuit structure of the magnetic field detection sensor differ for each user terminal (1') model, this initial correction procedure can minimize errors that may occur during the process of determining the location of the nasogastric tube (10) after insertion into the body. This process may include a normalization process based on continuous measurements at multiple locations and the results thereof, rather than a single measurement, thereby ensuring high reproducibility even within the same environment. In the initial correction stage, the magnetic field detection unit (11) recognizes the metal body (132) as a magnetic field source while the nasogastric tube (10) is located outside the patient's body, and measures the magnetic field strength at multiple points by moving the user terminal (1') along various paths near the nasogastric tube (10). The measurement path can be set in various patterns, such as circular, square, or zigzag shapes, in addition to linear movement, which allows for the detection of magnetic field changes in all directions of the terminal (1'). At each measurement point, magnetic field vector data in the X, Y, and Z axis directions can be collected, and the tilt, direction, and position coordinates of the terminal (1') at that time can be recorded together. This data is stored along with a time stamp and can serve as a basis for applying time series analysis, average value correction, noise removal filtering, etc., in the sensor correction unit (12) thereafter. The magnetic field detection unit (11) can perform a multi-layer filtering procedure to minimize magnetic interference elements of the surrounding environment during measurement. For example, a frequency selection filter can be applied to identify and remove unnecessary magnetic signals generated from nearby electric motors, steel structures, home appliances, etc.Additionally, by analyzing the magnetic field change curve detected while moving along the measurement path, abnormal surges and drops can be detected, and the corresponding data can be excluded or corrected. If necessary, instantaneous environmental changes or sensor errors can be corrected by measuring the same path two or more times and calculating the average value. The sensor correction unit (12) can determine the location where the maximum magnetic field strength is detected among the measurement data transmitted from the magnetic field detection unit (11) as the actual location of the magnetic field detection sensor within the user terminal (1'). At this time, the location coordinates of the point of maximum strength are mapped together with the direction angles (roll, pitch, yaw) of the terminal (1'), so that the accurate location of the magnetic field detection sensor in a three-dimensional coordinate system can be derived. The sensor correction unit (12) can set the derived location as the 'magnetic field detection sensor coordinates' and define the magnetic field strength at the corresponding coordinates as the 'reference magnetic field strength'. All magnetic field values ​​obtained from measurements after insertion are normalized based on this reference magnetic field strength, thereby reducing errors caused by differences in sensor sensitivity or hardware characteristics between terminal (1') models. In the normalization process, in addition to simple proportional correction, log scaling, root transformation, or non-linear regression-based correction functions may be applied. This method ensures that stable conversion values ​​can be secured even when the sensor output is not linear. Furthermore, the sensor correction unit (12) stores correction factors (coefficients, offset values, conversion formulas, etc.) in non-volatile memory so that they can be used repeatedly for the same patient or the same model. Multiple sets of stored correction factors can be configured for each model and environment, and a function to automatically select the most suitable set when the environment changes may be included. The initial correction procedure can be performed repeatedly in the same medical environment as well as for a single patient. For example, when examining multiple patients consecutively in the same ward or examination room, the initial correction results can be reused as is, or the correction values ​​can be updated through small-scale re-measurements.In addition, the measurement path, speed, and inclination information recorded during the calibration process can be utilized in the subsequent development of an automatic calibration algorithm for the same type of terminal (1'). This allows the initial calibration time to be shortened, and enables the sensor position to be automatically set simply by the user moving the terminal (1') without any separate complex operations. The initial calibration procedure according to FIG. 4 described above can be organically connected with the judgment step after insertion (see FIG. 6). That is, the magnetic field sensing sensor coordinates and reference magnetic field strength obtained during the initial calibration are directly applied during the interpretation process of the magnetic field data detected after insertion, and can be utilized to accurately calculate the actual position of the metal body (132) at the end of the nasogastric tube (10) in three-dimensional coordinates. Thus, the process of determining before and after insertion can be performed continuously, and location estimation with high reliability can be achieved even in a single terminal environment. FIG. 5 is a diagram illustrating an example of an interface including a magnetic field sensor location output on a user terminal according to an embodiment of the present disclosure. Referring to FIG. 5, the output unit (14) can provide a screen through the display unit (150) that visually displays the magnetic field detection sensor location information of the user terminal (1') calculated through the initial correction procedure performed in FIG. 4. The display unit (150) is implemented in the form of a graphical user interface (GUI) on the front screen of the user terminal (1') and can be divided into multiple areas so that various information related to the correction result is provided intuitively. In this embodiment, the display unit (150) can be largely composed of a terminal exterior display area (151), a sensor location marking area (152), a correction data information area (153), a status guidance message area (154), and a user input / control area (155). Each area (151, 152, 153, 154, 155) The aspect ratio is adjusted according to screen size and resolution and user terminal model, and the color, icon, and font size of the interface may also be changed by user preferences or system default settings.The terminal exterior display area (151) may be an area that reduces and schematically represents the exterior of the user terminal (1') and places it in the center or on the left side of the screen. The terminal exterior display area (151) is rendered while maintaining the aspect ratio based on design data for each model, and the bezels, screen area, camera and sensor unit locations on the top, bottom, left, and right sides may be displayed as translucent outlines. The terminal exterior display area (151) may be a fixed shape, but it may also be implemented to support 3D interactions such as zooming in and out, rotation, and perspective switching. For example, when the screen is zoomed in with a pinch gesture, the part including the sensor location marking area (152) is displayed in detail so that the user can precisely check the sensor coordinates. The sensor location marking area (152) may be an area that visually displays the point of maximum magnetic field strength detected by the magnetic field detection unit (11) during the initial calibration stage on the terminal exterior display area (151). The marker can be implemented in the form of a circle, cross, dot, or luminous animation, and the color basically uses a red color scheme, but can be changed to green (high reliability), yellow (medium reliability), or red (low reliability) depending on the reliability. Around the marker, coordinate values ​​(in pixels or mm), detection intensity values ​​(in μT), and error range (±cm) may also be displayed. In addition, the sensor location marking can be made recognizable at a glance by the user using visual effects such as blinking, waveform diffusion, and gradual color change in addition to a fixed icon. In the sensor location marking area (152), the characteristics of the device type, such as the magnetic field detection sensor location changing when the user terminal (1') is rotated vertically or horizontally, may also be reflected, and for this purpose, the 'standard coordinate system' utilized in the sensor calibration unit (12) may be applied. The calibration data information area (153) is an information panel that displays all key values ​​calculated during the calibration process and can be placed at the bottom or side of the screen.The calibration data information area (153) may include a reference magnetic field strength value, sensor calibration coefficient, maximum detection point coordinates, measurement path type (straight line, curve, circle, etc.), number of measurements, whether noise is removed, date and time of calibration, and the model name of the user terminal (1'). In particular, the sensor position deviation for each user terminal (1') model can be displayed as both a numerical value and a graph, enabling comparison between identical models or with past records. Additionally, if environmental conditions (e.g., distance from surrounding metal objects, whether magnetic field interference is detected) and patient characteristics (e.g., body shape, posture) affect the calibration value, the corresponding conditions may be automatically recorded and displayed. The status guidance message area (154) may be located at the top of the screen as a guidance bar or pop-up window that intuitively conveys the current calibration status. In the status guidance message area (154), step-by-step status messages such as 'Calibration complete', 'Measurement value stabilization in progress', and 'Sensor position verification required' are displayed, and icons (check mark, warning mark, information mark) may be placed together on the left side of the message. Reliability is a color bar It can be expressed as a gauge, for example, if it is 90% or more, it can be displayed in green, if it is 70–89%, in yellow, and if it is less than 70%, in red. Additionally, if the measurement path is not moved sufficiently during the calibration process or if external magnetic interference is detected, a warning popup may be displayed to induce recalibration. The user input / control area (155) is placed at the bottom or right of the screen and may include buttons such as 'recalibration', 'save data', 'proceed to next step', and 'help'. These buttons may perform functions based on the user's touch input, and the 'proceed to next step' button may be disabled in emergency situations (e.g., when the error is too large). Additionally, a function to save the calibration results to a local storage or cloud server for long-term use may be included, and when saved, a patient ID, model, and date may be automatically assigned as tags.The screen of FIG. 5 in this embodiment is not merely a simple data output, but can be directly linked with the system configuration presented in FIG. 1 (magnetic field detection unit (11), sensor correction unit (12), position determination unit (13), output unit (14)). That is, the value measured by the magnetic field detection unit (11) is analyzed and normalized by the sensor correction unit (12), and the result is visualized on the screen of FIG. 5 and provided to the user through the output unit (14). In this way, the user can check at a glance whether the initial correction before insertion of the nasogastric tube (10) into the body has been successfully completed, and can increase the accuracy of the judgment process after insertion of the nasogastric tube (10) into the body. FIG. 6 is a diagram illustrating the process of determining the position of a nasogastric tube inserted into the body according to one embodiment of the present disclosure. The user terminal system (1) according to this embodiment combines the initial correction process and magnetic field sensor position information within the user terminal (1') while the nasogastric tube (10) is inserted into the patient's body, and the magnetic field detection unit (11), sensor correction unit (12), The position determination unit (13) and the output unit (14) operate sequentially and organically, thereby enabling the final three-dimensional insertion position to be calculated with high precision. The magnetic field detection unit (11) can continuously measure the magnetic field emitted from the metal body (132) included in the inlet (130) of the nasogastric tube (10) in real time in the patient's external environment. This magnetic field is generated by eddy currents induced in the metal body (132), and the eddy currents can be collected through a multi-axis magnetic field sensor array so that they can be stably detected even under various fluctuating conditions such as internal respiration, heart rate, changes in body position, and electromagnetic interference from the surrounding environment. Data measured for each axis undergoes a primary signal processing process including directional correction, noise removal filtering, and temperature correction to correct differences in magnetic field strength by spatial direction, remove noise, and correct changes in sensor characteristics caused by changes in body temperature. The sensor correction unit (12) adjusts the magnetic field strength collected by the detection unit (11) to the reference magnetic field strength established in the initial correction stage. It can be normalized.In this process, sensor sensitivity deviations by user terminal (1') model are eliminated, interference caused by surrounding environments such as electronic devices and metal bed structures in the hospital room is minimized, and a correction algorithm that takes into account the individual characteristics of the patient can be applied. For example, in patients with abdominal obesity, the distance between the metal body (132) and the sensor is relatively long, so the magnetic field strength attenuation is large; therefore, a distance-based attenuation model can be applied to recalculate the measurement value. In the case of pediatric patients, since their body size is small, the range of magnetic field strength change is fast and sensitive; therefore, the time interval can be reduced to perform more dense sampling. In the case of patients with metal implants, since the metal fixture may distort the magnetic field path, a restricted mode that selects only data in a specific direction may be applied. Additionally, a personalized correction method that dynamically adjusts the correction ratio of the measurement value based on pre-collected physical indicators (height, weight, abdominal and thoracic circumference, body composition analysis results, etc.) for each patient may be applied in parallel. The position determination unit (13) can receive normalized data from the sensor correction unit (12) as input and calculate the three-dimensional insertion position of the nasogastric tube (10) through a position determination algorithm. The input data input to the position determination algorithm in this embodiment may include reference magnetic field strength, real-time measured magnetic field strength, magnetic field detection coordinates, time rate of change, patient body shape information (height, weight, abdominal and thoracic circumference, etc.), insertion direction, past insertion history, age, gender, as well as real-time patient vital signs (heart rate, respiratory cycle) and surrounding environment sensor data. A preprocessing module operates to perform outlier removal, offset correction between sensor arrays, missing data interpolation, and coordinate system unification procedures on raw magnetic field data collected from magnetic field sensing sensors. In the preprocessing step, particularly to reduce directional errors of multi-axis sensors, ratio adjustment between three axes and rotation matrix-based coordinate transformation may be applied.Additionally, frequency band filtering may be performed in parallel to reduce environmental noise at different measurement times, and the filter parameters may be automatically adjusted according to the patient-specific correction records. The position determination algorithm can extract spatial characteristics of the magnetic field distribution formed in the multi-axis sensor array. The position determination algorithm analyzes the magnetic field distribution pattern according to the actual position and direction of the metal body (132) and can reflect non-linear distortion, interference patterns, and distance-based intensity reduction patterns. In particular, by applying a multi-scale filtering structure to analyze local and global patterns, it can respond sensitively to both short-distance and long-distance changes. The position determination algorithm can analyze the temporal flow of changes in magnetic field strength as insertion progresses. The position determination algorithm can calculate the coordinates (X, Y, Z), insertion depth (mm), and insertion angle (°) of the metal body (132) as continuous values ​​by combining the previously extracted spatial characteristics and time-series characteristics. The position determination algorithm is designed with a multi-input multi-output structure to simultaneously calculate the position and direction in a single analysis process, and can derive personalized results by applying patient-specific correction parameters. In addition, a feedback loop is formed in this step, allowing some parameters of the position determination algorithm to be dynamically corrected based on the error between real-time measured values ​​and predicted values. A reliability evaluation and post-processing module operates to perform, for example, probability-based reliability evaluation, Gaussian error distribution analysis, and cross-validation with a physical model on the calculated position values. Through this, the judgment reliability (%) and expected error range (mm) are added to the final result, and a flag recommending re-measurement can be output together if the uncertainty is high. In particular, if the reliability is below a certain threshold, correction guides such as changing the patient's position, adjusting the sensor position, or removing surrounding metal can be automatically provided. Furthermore, the position determination unit (13) of this embodiment may adopt a hybrid structure in which a local server and a central server are combined.The local server performs real-time analysis within the terminal (1') to minimize latency, and the central server can periodically utilize large-scale patient data collected from hospitals and research institutions. To this end, the location determination unit (13) transmits de-identified measurement data and analysis results to the central server, and can update algorithm parameters by receiving them back from the central server to the terminal (1'). Through this structure, by continuously utilizing magnetic field measurement data under various patient groups, various types of sensor environments, and various hospital room environmental conditions, the accuracy and universality of the analysis can be increased. FIG. 7 is a flowchart illustrating the operational structure of a location determination algorithm based on repetitive insertion or various patient data according to an embodiment of the present disclosure. FIG. 7(a) illustrates the operational flow for the same patient unit, and FIG. 7(b) illustrates the operational flow for multiple patient groups. First, referring to FIG. 7(a), in step (S10), pre-stored data loading and environment initialization based on patient identification can be performed. Specifically, prior to the location determination process for the same patient, the system (1) obtains from the previous insertion history Data and information on the patient's physical characteristics (e.g., body type, age, gender, etc.), sensor location information by model, and initial correction values ​​can be retrieved. This preliminary preparation step can serve as a basis for minimizing errors in the subsequent judgment process. In step (S12), the sensing data detected during the actual insertion process and the judgment results can be recorded in synchronization. Specifically, continuous measurement values ​​collected by the magnetic field detection unit (11) and the judgment results of the position judgment unit (13) during the process of inserting the nasogastric tube (10) into the patient can be stored in chronological order. This data can be recorded to match actual measurements corresponding to changes in the actual insertion path and depth. In step (S14), the recorded judgment results and actual measurements can be compared to analyze patient-specific error patterns.Specifically, the stored judgment result and the actual confirmed nasogastric tube (10) location information are compared so that error characteristics specific to the patient can be analyzed. This analysis may include various variables such as the insertion angle, the patient's position, and changes in breathing patterns. In step (S16), patient-specific correction parameters can be generated based on the analysis results and reflected in the algorithm. Specifically, patient-specific correction coefficients or algorithm parameters can be updated based on the analyzed error characteristics. The updated correction values ​​can be reflected in the corresponding location judgment algorithm when a nasogastric tube is subsequently inserted or replaced for the same patient. Next, referring to FIG. 7(b), in step (S20), the collection and secure transmission of data from multiple patient groups can be performed. Specifically, the system (1) can receive data collected from multiple patient groups. At this stage, the collected data can be anonymized to protect personal information and transmitted to a server via a secure communication environment. In step (S22), the collected data can be classified and preprocessed according to patient characteristics and environmental conditions. Specifically, the received data can be classified and preprocessed according to the patient's demographic characteristics (e.g., age group, gender, body type), clinical conditions (e.g., presence of abdominal obesity, presence of metal implants), and environmental conditions (e.g., degree of electromagnetic interference at the measurement location). In this process, unnecessary noise data is removed, and the data can be standardized into a form comparable under the same conditions. In step (S24), multiple preprocessed patient data can be integrated and analyzed. Specifically, various classified and refined patient group data can be integrated and analyzed. During the analysis process, a location determination algorithm capable of responding to multiple conditions can be derived by reflecting signal patterns, error patterns, and the correlation between insertion depth and magnetic field strength that appear in different patient groups. In step (S26), the derived location determination algorithm can be distributed, and its performance verified in a real environment.Specifically, the position determination algorithm can be deployed to a user terminal (1') or a sensor device and applied in an actual clinical or home environment. Through this, position determination that operates stably under various physical and environmental conditions, not limited to a specific patient, becomes possible. As such, the flow structure illustrated in FIGS. 7(a) and FIGS. 7(b) demonstrates that a motion structure based on the same patient and a motion structure based on multiple patient groups can be performed complementarily. Through this, the user terminal system (1) of the present disclosure can simultaneously secure high adaptability to various user environments. FIG. 8 is a diagram illustrating an example of an interface for a user terminal that outputs the insertion position in a visual or auditory manner according to an embodiment of the present disclosure. The user terminal (1') according to the present embodiment integrates the magnetic field sensor position verification function described in FIG. 5 and the analysis result of the position determination algorithm described in FIG. 6 to provide a graphic and auditory-based output environment designed to allow intuitive verification of the current insertion status of the nasogastric tube (10). This output environment can be generated by combining continuous data collected from the magnetic field detection unit (11) with the analysis results of the position determination unit (13) after the data undergoes a model-specific and environment-specific correction process in the sensor correction unit (12). The interface screen can display the insertion position of the nasogastric tube (10) by overlaying it on a simplified 2D or 3D schematic diagram of the patient's body. As shown in FIG. 5, since the sensor position is determined and corrected first, the coordinate mapping on this schematic diagram can be displayed with minimal initial error. The internal paths of the patient, such as the nasal cavity, pharynx, esophagus, and stomach, are visually distinguished and represented, and the current position of the metal body (132) can be displayed as an icon, dot, marker, etc. This display method does not simply show the 'depth value,' but allows one to see at a glance which section of the actual insertion path it is located in, making it intuitively interpretable not only by medical staff but also by non-experts.For example, the situation can be immediately recognized through color changes, such as when the metal body icon is within the normal position range being displayed in green, when approaching a potentially dangerous position being displayed in yellow, and when proceeding along an incorrect path being displayed in red. Additionally, the interface can operate in conjunction with the sensor position correction value as described in FIG. 5. Since the magnetic field sensor position of a specific user terminal (1') model is accurately identified during the initial correction process, the path and position displayed during actual insertion may not vary depending on the terminal model. This ensures that consistent screen display quality can be maintained even if various terminal models (1') are used in combination in the medical field. In this embodiment, in addition to visual information, sound and tactile output may be provided. A short, soft notification sound is output in the normal state, a repetitive, high-pitched warning sound is output in the warning state, and tactile feedback using a vibration motor may be provided if necessary. For example, if the metal body (132) exceeds the allowable depth or deviates from the path, a warning pop-up appears on the terminal screen and vibration occurs simultaneously, allowing the user to respond immediately. The screen configuration can be switched between a brief mode and a detailed mode depending on the situation and user level. In brief mode, only the current insertion depth and whether it is normal or a warning are simply displayed, while in detailed mode, the insertion angle, error value relative to the reference position, judgment reliability (%), and a graph of position change over time may be provided together. Additionally, the interface of this embodiment may include a function to record and play back the entire insertion process along the time axis. This function sequentially saves position data from the start of insertion to the end of insertion, and allows the insertion path to be recalled by playing it back in the form of a graph or animation when necessary. Medical staff can utilize this record to analyze the quality of the procedure or use it as reference material for future procedures on the same patient. Usability in a remote environment is also considered.For example, in home care or mobile medical environments, the interface screen displayed on the terminal is transmitted to a medical institution server in real time, allowing remote medical staff to provide real-time monitoring and feedback. In this process, patient personal information is anonymized, and security can be maintained by using an encryption protocol for the transmission path. In terms of environmental adaptability, the interface of this embodiment can be designed to respond to various medical field conditions. Screen color contrast, font size, notification sound frequency, and vibration pattern can be optimized so that information can be clearly transmitted even under strong lighting in a hospital room, noise in an emergency room, or vibration in a mobile medical vehicle. In conclusion, the user terminal interface illustrated in FIG. 8 is not merely a simple output means, but can be a core component that ensures safety, accuracy, and immediacy by integrally reflecting the sensor position correction value established in FIG. 5 and the analysis result of the position determination unit (13) in FIG. 6. This configuration can significantly improve the efficiency and safety of the nasogastric tube insertion procedure through multidimensional feedback encompassing visual, auditory, and tactile senses, user-customized display modes, recording and playback of the insertion process, remote linkage, and secure transmission functions. FIG. 9 is a flowchart illustrating a method of operating a user terminal system for determining the position of a nasogastric tube within the body according to an embodiment of the present disclosure. In step (S30), before the nasogastric tube (10) is inserted into the patient's body, a magnetic field generated from the nasogastric tube (10) equipped with a magnet can be detected by a magnetic field detection unit (11). Specifically, a magnetic field can be generated by bringing a metal body (132) or a magnet included in the inlet (130) of the nasogastric tube (10) close to the magnetic field detection unit (11) outside the patient's body, that is, in a state prior to insertion. Accordingly, eddy currents are generated within the metal body (132), and the magnetic field detection unit (11) can measure the magnetic field generated therefrom. This measurement is performed under conditions where environmental interference is minimized to secure the true value of the reference signal to be used in subsequent steps.In step (S32), prior to the insertion of the nasogastric tube (10), the sensor correction unit (12) can locate the exact position of the magnetic field detection sensor for each model of the user terminal (1') based on the magnetic field strength and normalize and correct the measured value. Specifically, the sensor correction unit (12) can determine the actual physical position of the magnetic field detection sensor by identifying the point where the magnetic field response shows a maximum value by referring to the sensor module placement information of the corresponding terminal model in an internal database. In this process, the sensor position offset, which may vary depending on the model, is removed, and background magnetic field components originating from external metal structures or electronic devices can be corrected. Additionally, the measured magnetic field strength is normalized by comparing it with a pre-set reference magnetic field strength, and the position determination in the subsequent insertion step (S34) can be performed based on the same coordinates. Consequently, this step eliminates hardware deviations depending on the terminal model, thereby establishing a foundation for the same algorithm to operate consistently on all terminals (1'). In step (S34), the position determination unit (13) can determine the insertion position of the nasogastric tube (10) into the body by measuring the strength of the magnetic field generated from the nasogastric tube (10) inserted into the patient's body. Specifically, the position determination unit (13) can receive normalized magnetic field data, patient characteristic information (e.g., height, weight, abdominal / thoracic circumference, age, gender), insertion angle, past procedure history, etc. as input values, and calculate the current position of the metal body (132) in a three-dimensional coordinate system through a position determination algorithm. In step (S36), the insertion location can be output visually or audibly by the output unit (14). Specifically, the current location of the metal body (132) is displayed on the screen of the user terminal (1') over the patient's internal path diagram, and visual distinction can be made, for example, in green for the normal range, yellow for the caution range, and red for the danger range.In addition, in a warning state, high-frequency alert sounds or vibration feedback are provided in parallel to enable the operator to respond immediately. The output information may include additional information such as insertion angle, error relative to reference position, and judgment reliability, in addition to a simple depth value. The drawings and the detailed description of the invention referenced so far are merely exemplary of the invention and are used only for the purpose of explaining the invention, not to limit the meaning or the scope of the invention as defined in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the invention should be determined by the technical spirit of the appended claims. The embodiments described above may be implemented as hardware components, software components, and / or combinations of hardware components and software components. For example, the devices, methods, and components described in the embodiments may be implemented using one or more general-purpose or special-purpose computers, such as, for example, a processor, a controller, an Arithmetic Logic Unit (ALU), a Digital Signal Processor, a microcomputer, a Field Programmable Gate Array (FPGA), a Programmable Logic Unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing unit may execute an operating system and one or more software applications executed on said operating system. Additionally, the processing unit may access, store, manipulate, process, and generate data in response to the execution of the software.For convenience of understanding, although a processing unit is sometimes described as being used as a single unit, those skilled in the art will understand that the processing unit may include multiple processing elements and / or multiple types of processing elements. For example, the processing unit may include multiple processors or one processor and one controller. Additionally, other processing configurations, such as parallel processors, are possible. Software may include computer programs, code, instructions, or a combination of one or more of these, and may configure the processing unit to operate as desired or command the processing unit independently or collectively. Software and / or data may be embodied in any type of machine, component, physical device, virtual equipment, computer storage medium, or device to be interpreted by the processing unit or to provide instructions or data to the processing unit. Software may be distributed over networked computer systems and may be stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media. The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., alone or in combination. The program instructions recorded on the medium may be those specifically designed and configured for the embodiment, or they may be those known and available to those skilled in the art of computer software.Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc. The hardware devices described above may be configured to operate as one or more software modules to perform the operation of the embodiments, and vice versa. Although the embodiments have been described above with reference to limited embodiments and drawings, those skilled in the art can make various modifications and variations from the description above. For example, appropriate results may be achieved even if the described techniques are performed in a different order than described, and / or the components of the described system, structure, device, circuit, etc. are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents. Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below.

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[0218] delete Explanation of the symbols 1: User terminal system for determining the position of a nasogastric tube within the body 10: Nasogastric tube 11: Magnetic field detection unit 12: Sensor calibration unit 13: Position determination unit 14: Output unit

Claims

Claim 1 A user terminal system for determining the position of a nasogastric tube within the body, comprising: a magnetic field sensing unit for detecting a magnetic field generated from a nasogastric tube equipped with a magnet; a sensor correction unit for determining the position of a magnetic field sensing sensor for each model of the user terminal based on the strength of the magnetic field; a position determination unit for determining the insertion position of the nasogastric tube within the body by measuring the strength of the magnetic field generated from the nasogastric tube inserted into the patient's body; and an output unit for outputting the insertion position in a visual or auditory manner. Claim 2 A user terminal system for determining the location of a nasogastric tube within the body, wherein the magnetic field sensing unit is configured to continuously detect the magnetic field generated from the nasogastric tube located outside the body at a plurality of locations along the movement path of the user terminal and to measure the strength of the magnetic field at each location. Claim 3 A user terminal system for determining the location of a nasogastric tube within the body, wherein the sensor correction unit determines the location where the maximum value among the measured magnetic field strengths is detected as the location of the magnetic field sensing sensor within the user terminal. Claim 4 A user terminal system for determining the position of a nasogastric tube within the body, wherein the output unit visually outputs the three-dimensional position of a magnetic field sensing sensor determined by the sensor correction unit on the user terminal. Claim 5 A user terminal system for determining the position of a nasogastric tube within the body, wherein, in claim 3, the sensor correction unit sets the magnetic field strength having the maximum value as a reference magnetic field strength, and the position determination unit compares and analyzes the reference magnetic field strength with the magnetic field strength detected from the nasogastric tube inserted into the patient's body to determine the insertion position within the body. Claim 6 In claim 5, the position determination unit performs a position determination algorithm to determine the insertion position of the nasogastric tube within the body using the strength of the magnetic field having the maximum value, the position of the magnetic field sensing sensor, and the patient's body characteristic information as input values, a user terminal system for determining the position of the nasogastric tube within the body. Claim 7 In claim 6, the position determination unit performs the position determination algorithm based on the magnetic field strength corresponding to the maximum value for the same patient, the position of the determined magnetic field sensing sensor, and the body characteristic information, for a user terminal system for determining the position of a nasogastric tube within the body. Claim 8 A user terminal system for determining the position of a nasogastric tube within the body, wherein the position determination unit accumulates the magnetic field strength corresponding to the maximum value, the position of the determined magnetic field sensing sensor, and the body characteristic information for a plurality of patients under a secure environment, and performs the position determination algorithm based on the accumulated data to determine the position of the nasogastric tube insertion within the body according to the body characteristics of each patient. Claim 9 A method for operating a user terminal system for determining the position of a nasogastric tube within the body, comprising: a step of detecting a magnetic field generated from a nasogastric tube equipped with a magnet by a magnetic field detection unit; a step of determining the position of a magnetic field detection sensor for each model of a user terminal based on the strength of the magnetic field by a sensor correction unit; a step of determining the insertion position of the nasogastric tube within the body by measuring the strength of the magnetic field generated from the nasogastric tube inserted into the patient's body by a position determination unit; and a step of outputting the insertion position in a visual or auditory manner by an output unit. Claim 10 A computer-readable non-transient recording medium having a program recorded thereon for executing a method of operating a user terminal system for determining the position of a nasogastric tube within the body according to claim 9.

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