A method and apparatus for detecting a failure of a blood oxygen probe

Abstract

The application discloses a blood oxygen probe fault detection method and device, and relates to the technical field of fault detection. During blood oxygen detection, a detection signal used for blood oxygen probe fault detection is synchronously detected, and during the blood oxygen detection process, a fault detection result is determined according to the relationship between the detection signal and a threshold value, that is, the blood oxygen signal acquisition and the probe fault detection are synchronously performed, the blood oxygen signal acquisition is not affected during the blood oxygen probe fault detection, and the influence of the blood oxygen signal interruption on the blood oxygen calculation during the blood oxygen probe fault detection process is avoided. Moreover, the fault detection points at least include a light-emitting tube of the blood oxygen probe, a wire connected with the light-emitting tube, a light-receiving component of the blood oxygen probe and / or a wire connected with the light-receiving component. The fault detection information includes short circuit or open circuit, and when all the fault detection points are detected, comprehensive fault detection of the blood oxygen probe is realized as much as possible.

Description

Technical Field

[0001] This invention relates to the field of fault detection technology, and in particular to a method and apparatus for detecting faults in a pulse oximeter probe. Background Technology

[0002] Blood oxygen saturation (POS) measurement is a simple and rapid monitoring method widely used in various fields such as medicine, sports, and high-altitude environments. It provides important data for assessing human oxygenation status, diagnosing diseases, guiding treatment, and ensuring health. However, during POS measurement, if a short circuit or open circuit occurs between any two wires of the POS probe and its extension cable, it may cause harm to the user, such as burns due to heat generated by the short circuit, or errors in POS measurement due to a short circuit or open circuit in the probe and its extension cable.

[0003] The common method for detecting pulse oximeter probe malfunctions involves performing pulse oximeter signal acquisition and probe malfunction detection at different times. This means that probe malfunction detection cannot be performed simultaneously with pulse oximeter signal acquisition. Because a valid pulse oximeter signal cannot be acquired during probe malfunction detection, this approach affects pulse oximeter readings.

[0004] Therefore, there is an urgent need for a pulse oximeter fault detection method that can detect pulse oximeter faults without affecting the acquisition of pulse oximeter signals, and avoid the impact of pulse oximeter signal interruption on pulse oximeter calculation during the pulse oximeter fault detection process. Summary of the Invention

[0005] The purpose of this invention is to provide a method and apparatus for detecting blood oxygen probe failures, in order to solve the technical problem that in the blood oxygen probe failure detection method, which separates blood oxygen signal acquisition and probe failure detection, effective blood oxygen signals cannot be acquired during the probe failure detection period, thus affecting blood oxygen detection.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for detecting pulse oximeter faults, applied to a pulse oximeter fault detection device, the method comprising:

[0007] Acquire fault detection points and fault detection information for those points; wherein, the fault detection point includes at least the light-emitting diode of the pulse oximeter, the wire connected to the light-emitting diode, the light-receiving component of the pulse oximeter, and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit;

[0008] The detection signal obtained during the target blood oxygen detection timing is obtained based on the fault detection information of the fault detection point; wherein, the detection signal includes at least the voltage signal at both ends of the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe;

[0009] During blood oxygen detection, the detection signal measured during the target blood oxygen detection time sequence is compared with the threshold corresponding to the detection signal, and the detection result corresponding to the fault detection information of the fault detection point is determined based on the comparison result.

[0010] For example, the pulse oximeter probe has multiple light-emitting diodes, and each light-emitting diode emits light in turn according to the pulse oximeter detection sequence during the pulse oximeter detection process; the light-receiving component is a photosensitive tube or a silicon photocell.

[0011] When the light-receiving component is a phototube, the wires connected to the light-receiving component are the power supply wire of the phototube, the output wire of the phototube, and the grounding wire of the phototube;

[0012] When the light-receiving component is a silicon photovoltaic cell, the wires connected to the light-receiving component are silicon photovoltaic cell cathode wires and silicon photovoltaic cell anode wires.

[0013] For example, the detection signal is the voltage signal across the LED and the output signal, the threshold corresponding to the voltage signal is a first voltage threshold and a second voltage threshold, the first voltage threshold being greater than the second voltage threshold; the threshold corresponding to the output signal is a first signal threshold and a second signal threshold, the first signal threshold being greater than the second signal threshold.

[0014] For example, if the fault detection information of the fault detection point is the open circuit of the anode wire of the current light-emitting diode, then the target blood oxygen detection timing is the blood oxygen detection timing corresponding to the current light-emitting diode emitting light.

[0015] The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes:

[0016] The voltage signal across the current LED measured during the target blood oxygen detection timing is compared with the first voltage threshold, and the frequency of the output signal during the target blood oxygen detection timing is compared with the second signal threshold.

[0017] If the comparison result shows that the voltage signal at both ends of the current LED is greater than the first voltage threshold and the frequency of the output signal is less than the second signal threshold, then it is determined that the anode wire of the current LED is open-circuited.

[0018] For example, if the fault detection information of the fault detection point is a broken wire connected to the light receiving component, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of each light-emitting tube.

[0019] The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes:

[0020] The frequency of the output signal obtained during each of the target blood oxygen detection time sequences is compared with the second signal threshold.

[0021] If the comparison result shows that the frequency of the output signal obtained in each of the target blood oxygen detection timings is less than the second signal threshold, then it is determined that the wire connected to the light receiving component is broken.

[0022] For example, if the fault detection information of the fault detection point is a short circuit between the anode of the first light-emitting diode and the anode of the second light-emitting diode, then the target blood oxygen detection timing sequence is the first target blood oxygen detection timing sequence and the second target blood oxygen detection timing sequence; wherein, the first target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to when the first light-emitting diode emits light, and the second target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to when the second light-emitting diode emits light;

[0023] The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes:

[0024] The voltage signal across the second LED obtained during the first target blood oxygen detection timing is compared with the second voltage threshold, and the voltage signal across the first LED obtained during the second target blood oxygen detection timing is compared with the second voltage threshold;

[0025] If the comparison result shows that the voltage signal across the second light-emitting diode obtained during the first target blood oxygen detection timing is greater than the second voltage threshold, and the voltage signal across the first light-emitting diode obtained during the second target blood oxygen detection timing is greater than the second voltage threshold, then it is determined that a short circuit has occurred between the anode of the first light-emitting diode and the anode of the second light-emitting diode.

[0026] For example, if the fault detection information of the fault detection point is a short circuit between the anode of the current light-emitting diode and the power supply wire of the photosensitive diode, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of other light-emitting diodes; wherein, the other light-emitting diodes are all light-emitting diodes except the current light-emitting diode.

[0027] The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes:

[0028] During each of the target blood oxygen detection timing sequences, the voltage signal at both ends of the current light-emitting diode is compared with the first voltage threshold.

[0029] If the comparison result shows that the voltage signal at both ends of the current light-emitting diode is greater than the first voltage threshold during the detection timing of each target blood oxygenation, then it is determined that the anode of the current light-emitting diode is short-circuited with the power supply wire of the photosensitive tube.

[0030] For example, if the fault detection information of the fault detection point is a preset short circuit condition, then the target blood oxygen detection timing is the blood oxygen detection timing corresponding to when the current light-emitting diode emits light; wherein, the preset short circuit condition is a short circuit between the anode of the current light-emitting diode and the output wire of the photosensitive diode, a short circuit between the anode of the current light-emitting diode and the ground wire of the photosensitive diode, a short circuit between the anode of the current light-emitting diode and the cathode wire of the silicon photovoltaic cell, or a short circuit between the anode of the current light-emitting diode and the anode wire of the silicon photovoltaic cell;

[0031] The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes:

[0032] The frequency of the output signal obtained during the target blood oxygen detection timing is compared with the second signal threshold.

[0033] If the comparison result shows that the frequency of the output signal obtained during the target blood oxygen detection timing is less than the second signal threshold, then the preset short circuit condition is determined to be true.

[0034] For example, if the fault detection information of the fault detection point is a short circuit between different wires connected to the light receiving component, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of each light-emitting tube; wherein, the short circuit between different wires connected to the light receiving component includes at least the short circuit between the power supply wire and the output wire of the phototube, the short circuit between the power supply wire and the ground wire of the phototube, the short circuit between the output wire and the ground wire of the phototube, and the short circuit between the cathode wire and the anode wire of the silicon photovoltaic cell;

[0035] The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes:

[0036] The frequency of the output signal obtained during each of the target blood oxygen detection time sequences is compared with the second signal threshold.

[0037] If the comparison result shows that the frequency of the output signal obtained in each of the target blood oxygen detection timings is less than the second signal threshold, then it is determined that there is a short circuit between the different wires connected to the light receiving component.

[0038] To address the aforementioned technical problems, the present invention also provides a pulse oximeter fault detection device, comprising:

[0039] The first acquisition module is used to acquire fault detection points and fault detection information of the fault detection points; wherein, the fault detection point includes at least the light-emitting tube of the pulse oximeter, the wire connected to the light-emitting tube, the light-receiving component of the pulse oximeter and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit;

[0040] The second acquisition module is used to acquire the detection signal measured during the target blood oxygen detection time sequence based on the fault detection information of the fault detection point; wherein, the detection signal includes at least the voltage signal at both ends of the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe;

[0041] The comparison and determination module is used to compare the detection signal measured during the target blood oxygen detection time sequence with the threshold corresponding to the detection signal during the blood oxygen detection process, and determine the detection result corresponding to the fault detection information of the fault detection point based on the comparison result.

[0042] The pulse oximeter fault detection method provided by this invention is applied to a pulse oximeter fault detection device. The method first acquires the fault detection point and the fault detection information of the fault detection point, then acquires the detection signal measured during the target pulse oximeter detection time series based on the fault detection information of the fault detection point, and finally compares the detection signal measured during the target pulse oximeter detection time series with the threshold corresponding to the detection signal, and determines the detection result corresponding to the fault detection information of the fault detection point based on the comparison result. Because the detection signal used for pulse oximetry probe fault detection is simultaneously measured during pulse oximetry detection, and the fault check result is determined based on the relationship between the detection signal and the threshold during pulse oximetry detection, the synchronous acquisition of pulse oximetry signal and detection of probe faults are achieved. The acquisition of pulse oximetry signal is not affected during pulse oximetry probe fault detection, avoiding the impact of pulse oximetry signal interruption on pulse oximetry calculation. Moreover, the fault detection point includes at least the light-emitting diode of the pulse oximetry probe, the wire connected to the light-emitting diode, the light-receiving component of the pulse oximetry probe, and / or the wire connected to the light-receiving component. The fault detection information includes short circuit or open circuit. When all fault detection points are detected, comprehensive fault detection of the pulse oximetry probe is achieved as much as possible.

[0043] In addition, the present invention also provides a pulse oximeter fault detection device, which has the same or corresponding technical features as the pulse oximeter fault detection method mentioned above, and has the same effect. Attached Figure Description

[0044] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A flowchart of a pulse oximeter fault detection method provided in an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a blood oxygen probe whose light-receiving part uses a phototube, provided for an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of a blood oxygen probe whose light-receiving part uses a silicon photovoltaic cell, provided for an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of a blood oxygen probe fault detection device provided in an embodiment of the present invention. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0050] The core of this invention is to provide a method and apparatus for detecting blood oxygen probe failures, in order to solve the technical problem that in the blood oxygen probe failure detection method, which separates blood oxygen signal acquisition and probe failure detection, effective blood oxygen signals cannot be acquired during the probe failure detection period, thus affecting blood oxygen detection.

[0051] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 A flowchart of a pulse oximeter fault detection method provided in an embodiment of the present invention is shown below. Figure 1 As shown, the method includes:

[0052] S10: Obtain the fault detection point and the fault detection information of the fault detection point;

[0053] S11: Obtain the detection signal measured during the target blood oxygen detection timing based on the fault detection information of the fault detection point; wherein, the detection signal includes at least the voltage signal at both ends of the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe;

[0054] S12: During the blood oxygen detection process, the detection signal measured during the target blood oxygen detection time sequence is compared with the threshold corresponding to the detection signal, and the detection result corresponding to the fault detection information of the fault detection point is determined based on the comparison result.

[0055] The fault detection points include at least the light-emitting diode of the pulse oximeter, the wire connected to the light-emitting diode, the light-receiving component of the pulse oximeter, and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit.

[0056] There is no limit to the number of light-emitting diodes (LEDs) in a pulse oximeter probe; it can be one or more. When there are multiple LEDs, they emit light sequentially according to the pulse oximeter detection time. There is no limitation on the light-receiving component; it can be a phototube or a silicon photovoltaic cell. The connecting wires to the light-receiving component differ depending on the component. For example, if the light-receiving component is a phototube, the connecting wires are the power supply wire, the output wire, and the ground wire. If the light-receiving component is a silicon photovoltaic cell, the connecting wires are the cathode wire and the anode wire.

[0057] The detection signals used for fault detection are not limited, such as the voltage signal across the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe.

[0058] After obtaining the fault detection information of the fault detection point, the detection signal measured during the target blood oxygen detection time sequence can be obtained based on the fault detection information. After obtaining the detection signal measured during the target blood oxygen detection time sequence, the detection signal can be compared with the corresponding threshold during blood oxygen detection. If the detection signal is the voltage signal across the LED, the corresponding threshold is a first voltage threshold and a second voltage threshold, with the first voltage threshold being greater than the second voltage threshold. The first voltage threshold can be called the maximum on-state voltage drop of the LED, and the second voltage threshold can be called the minimum on-state voltage drop of the LED. If the detection signal is the output signal of the light-receiving component of the blood oxygen probe, the corresponding threshold is a first signal threshold and a second signal threshold, with the first signal threshold being greater than the second signal threshold. The first signal threshold can be called the maximum frequency value of the output signal of the light-receiving component, and the second signal threshold can be called the minimum frequency value of the output signal of the light-receiving component.

[0059] After comparison, the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results.

[0060] In some embodiments, if the fault detection information of the fault detection point is the open circuit status of the anode wire of the current light-emitting diode, then the target blood oxygen detection timing is the blood oxygen detection timing corresponding to the current light-emitting diode emitting light.

[0061] The detection signal obtained during the target blood oxygen detection time series is compared with the threshold corresponding to the detection signal, and the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results, including:

[0062] The voltage signal across the LED measured during the target blood oxygen detection timing is compared with the first voltage threshold, and the frequency of the output signal during the target blood oxygen detection timing is compared with the second signal threshold.

[0063] If the comparison result shows that the voltage signal across the current LED is greater than the first voltage threshold and the frequency of the output signal is less than the second signal threshold, then it is determined that the anode wire of the current LED is open-circuited.

[0064] In some embodiments, if the fault detection information of the fault detection point is a broken wire connected to the light receiving component, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of each light-emitting tube.

[0065] The detection signal obtained during the target blood oxygen detection time series is compared with the threshold corresponding to the detection signal, and the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results, including:

[0066] The frequency of the output signal obtained during the blood oxygen detection time sequence of each target is compared with the second signal threshold;

[0067] If the comparison results show that the frequency of the output signal obtained during the blood oxygen detection timing of each target is less than the second signal threshold, then it is determined that the wire connected to the light receiving component is broken.

[0068] In some embodiments, if the fault detection information at the fault detection point is a short circuit between the anode of the first LED and the anode of the second LED, then the target blood oxygen detection timing sequence is the first target blood oxygen detection timing sequence and the second target blood oxygen detection timing sequence; wherein, the first target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to when the first LED emits light, and the second target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to when the second LED emits light.

[0069] The detection signal obtained during the target blood oxygen detection time series is compared with the threshold corresponding to the detection signal, and the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results, including:

[0070] The voltage signal across the second LED obtained during the first target blood oxygen detection timing is compared with the second voltage threshold, and the voltage signal across the first LED obtained during the second target blood oxygen detection timing is compared with the second voltage threshold.

[0071] If the comparison result shows that the voltage signal across the second LED obtained during the first target blood oxygen detection timing is greater than the second voltage threshold, and the voltage signal across the first LED obtained during the second target blood oxygen detection timing is greater than the second voltage threshold, then it is determined that a short circuit has occurred between the anode of the first LED and the anode of the second LED.

[0072] In some embodiments, if the fault detection information of the fault detection point is a short circuit between the anode of the current light-emitting diode and the power supply wire of the photosensitive diode, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of other light-emitting diodes; wherein, other light-emitting diodes are all light-emitting diodes except the current light-emitting diode.

[0073] The detection signal obtained during the target blood oxygen detection time series is compared with the threshold corresponding to the detection signal, and the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results, including:

[0074] During the blood oxygen detection sequence of each target, the voltage signal at both ends of the current light-emitting diode is compared with the first voltage threshold.

[0075] If the comparison result shows that the voltage signal at both ends of the current light-emitting diode is greater than the first voltage threshold during the blood oxygen detection timing of each target, then it is determined that the anode of the current light-emitting diode is short-circuited with the power supply wire of the photosensitive diode.

[0076] In some embodiments, if the fault detection information at the fault detection point is a preset short circuit condition, then the target blood oxygen detection timing is the blood oxygen detection timing corresponding to the current light-emitting diode emitting light; wherein, the preset short circuit condition is a short circuit between the anode of the current light-emitting diode and the output wire of the photosensitive diode, a short circuit between the anode of the current light-emitting diode and the ground wire of the photosensitive diode, a short circuit between the anode of the current light-emitting diode and the cathode wire of the silicon photovoltaic cell, or a short circuit between the anode of the current light-emitting diode and the anode wire of the silicon photovoltaic cell.

[0077] The detection signal obtained during the target blood oxygen detection time series is compared with the threshold corresponding to the detection signal, and the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results, including:

[0078] The frequency of the output signal obtained during the target blood oxygen detection time sequence is compared with the second signal threshold.

[0079] If the comparison result shows that the frequency of the output signal obtained during the target blood oxygen detection timing is less than the second signal threshold, then the preset short circuit condition is determined to be valid.

[0080] In some embodiments, if the fault detection information of the fault detection point is a short circuit between different wires connected to the light receiving component, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of each light-emitting diode; wherein, the short circuit between different wires connected to the light receiving component includes at least the short circuit between the power supply wire and the output wire of the phototube, the short circuit between the power supply wire and the ground wire of the phototube, the short circuit between the output wire and the ground wire of the phototube, and the short circuit between the cathode wire and the anode wire of the silicon photovoltaic cell;

[0081] The detection signal obtained during the target blood oxygen detection time series is compared with the threshold corresponding to the detection signal, and the detection results corresponding to the fault detection information of the fault detection point are determined based on the comparison results, including:

[0082] The frequency of the output signal obtained during the blood oxygen detection time sequence of each target is compared with the second signal threshold;

[0083] If the comparison results show that the frequency of the output signal obtained during the blood oxygen detection timing of each target is less than the second signal threshold, then it is determined that there is a short circuit between the different wires connected to the light receiving component.

[0084] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below, taking a phototube and a silicon photovoltaic cell as examples, with reference to the accompanying drawings and specific embodiments.

[0085] When detecting probe malfunctions, 1) collect necessary signals during blood oxygen detection; 2) compare the collected signals with thresholds; 3) determine the probe malfunction status based on the comparison results.

[0086] Figure 2 A schematic diagram of a pulse oximeter probe whose light-receiving part uses a phototube is provided as an embodiment of the present invention, as shown below. Figure 2 As shown, it consists of two parts: a light-emitting section and a light-receiving section. The light-emitting tubes include light-emitting tube 1, light-emitting tube 2, and light-emitting tube n. The light-receiving section uses a phototube. The cathode wire of each light-emitting tube shares a single wire with the ground wire of the phototube.

[0087] The blood oxygen detection sequence is as follows:

[0088] Blood oxygen detection sequence 1: LED 1 is turned on, and at the same time, the photosensitive tube receives light and converts it into an electrical signal to obtain signal 1.

[0089] Blood oxygen detection sequence 2: LED 2 is turned on, and at the same time, the phototube receives light and converts it into an electrical signal to obtain signal 2.

[0090] Blood oxygen detection sequence 3: LED n (optional LED) is turned on, and at the same time the photosensitive tube receives light and converts it into an electrical signal to obtain signal n.

[0091] Blood oxygen detection sequence 4: All light-emitting diodes are turned off, and at the same time, the photosensitive tube receives light and converts it into an electrical signal, resulting in signal 4.

[0092] The above process is a complete blood oxygen detection sequence. The light-emitting tube n is an optional light-emitting tube, and the number of light-emitting tube n is greater than or equal to 0.

[0093] 1) Collect the necessary signals:

[0094] At pulse oximetry detection times 1, 2, 3, and 4, the voltages across LEDs 1, 2, and n are measured, yielding voltages 1, 2, and n. These voltages are compared with the LED on-state voltage drop; the maximum on-state voltage drop is defined as voltage threshold 1, and the minimum is defined as voltage threshold 2. Simultaneously, the frequency range of the phototransistor's output signal is considered, with the maximum frequency defined as signal threshold 1 and the minimum as signal threshold 2. The output status of the current limiting circuit (i.e., the circuit comparing voltage thresholds) is then used to comprehensively determine whether a pulse oximetry probe malfunction has occurred.

[0095] 2) Compare the collected signal with the threshold:

[0096] If the voltage across the LED during testing is greater than the maximum forward conduction voltage, it is considered to be in an open circuit state.

[0097] If the voltage across the LED during testing is less than the minimum forward conduction voltage, it is considered to be in a short-circuit state.

[0098] If the voltage across a non-functional LED is greater than the minimum forward conduction voltage, it is considered that its cathode or anode is short-circuited with other wires.

[0099] If the output frequency of the phototube during normal output is less than its minimum output frequency, it is considered that the phototube has a short circuit or open circuit.

[0100] 3) Determine the probe's fault status based on the comparison results:

[0101] a. Determining if the circuit is open:

[0102] Light-emitting diode 1 anode lead open circuit: During blood oxygen detection timing 1, voltage 1 is measured to be greater than voltage threshold 1. During blood oxygen detection timing 1, signal 1 is measured to be less than signal threshold 2.

[0103] Light-emitting diode 2 anode lead open circuit: During blood oxygen detection timing 2, voltage 2 is measured to be greater than voltage threshold 1. During blood oxygen detection timing 2, signal 2 is measured to be less than signal threshold 2.

[0104] An open circuit occurs in the anode lead of the LED n: At pulse oximetry timing 3, the measured voltage n is greater than the voltage threshold 1. At pulse oximetry timing 3, the measured signal n is less than the signal threshold 2.

[0105] Phototube power supply wire open circuit: During blood oxygen detection timing sequence 1, 2, 3, the measured signals 1, 2, n are less than the signal threshold 2.

[0106] Phototube output open circuit: During blood oxygen detection timing 1, 2, 3, the measured signals 1, 2, n are less than the signal threshold 2.

[0107] Grounding interruption: During blood oxygen detection timing 1, signal 1 is less than signal threshold 2; during blood oxygen detection timing 2, signal 2 is less than signal threshold 2; during blood oxygen detection timing 3, signal n is less than signal threshold 2.

[0108] b. Determining short circuit conditions:

[0109] A short circuit occurs between the anode of LED 1 and the anode of LED 2: During pulse oximetry detection sequence 1, the measured voltage 2 is greater than the voltage threshold 2. During pulse oximetry detection sequence 2, the measured voltage 1 is greater than the voltage threshold 2.

[0110] A short circuit occurs between the anode of LED 1 and the anode of LED n: During pulse oximetry detection sequence 1, the measured voltage n is greater than the voltage threshold 2. During pulse oximetry detection sequence 3, the measured voltage 1 is greater than the voltage threshold 2.

[0111] A short circuit occurs between the anode of LED1 and the power supply wire of the phototube: During blood oxygen detection timings 2 and 3, the measured voltage 1 is greater than the voltage threshold 1.

[0112] When a short circuit occurs between the anode of LED1 and the output of the phototube, the measured signal 1 is less than the minimum threshold during blood oxygen detection timing 1.

[0113] When a short circuit occurs between the anode of LED1 and the ground wire, during blood oxygen detection timing 1, the current overcurrent signal is an effective value, and signal 1 is less than signal threshold 2.

[0114] A short circuit occurs between the anode of LED 2 and the anode of LED n: During blood oxygen detection sequence 2, the measured voltage n is greater than the voltage threshold 2. During blood oxygen detection sequence 3, the measured voltage 2 is greater than the voltage threshold 2.

[0115] A short circuit occurs between the anode of LED2 and the power supply wire of the phototube: During blood oxygen detection timings 1 and 3, the measured voltage 2 is greater than the voltage threshold 2.

[0116] When a short circuit occurs between the anode of LED 2 and the output of the phototube, the measured signal 2 is less than the signal threshold 2 during blood oxygen detection timing 2.

[0117] When a short circuit occurs between the anode of LED 2 and the ground wire, during blood oxygen detection timing 2, the current overcurrent signal is an effective value, and signal 2 is less than signal threshold 2.

[0118] A short circuit occurs between the anode of the LED n and the power supply wire of the phototube: During blood oxygen detection timings 1 and 2, the measured voltage n is greater than the voltage threshold 2.

[0119] When a short circuit occurs between the anode of LED n and the output of the phototube, the measured signal n is less than the signal threshold 2 during blood oxygen detection timing 3.

[0120] When a short circuit occurs between the anode of LED n and the ground wire, during blood oxygen detection timing 3, the current overcurrent signal is an effective value, and the signal n is less than the signal threshold 2.

[0121] When a short circuit occurs between the power supply wire of the phototube and the output of the phototube, the measured signals 1, 2, and n are less than the signal threshold 2 during blood oxygen detection timing sequence 1, 2, and 3.

[0122] When a short circuit occurs between the power supply wire of the phototube and the ground wire, the overcurrent signal is valid during blood oxygen detection timings 1, 2, 3, and 4, and signals 1, 2, and n are less than the signal threshold 2.

[0123] When a short circuit occurs between the output wire of the phototube and the ground wire, during blood oxygen detection timing 1, signal 1 is less than signal threshold 2; during blood oxygen detection timing 2, signal 2 is less than the minimum threshold; and during blood oxygen detection timing 3, signal n is less than signal threshold 2.

[0124] The probe fault status is determined based on the comparison results. If either an open circuit or a short circuit occurs during the probe fault inspection process, the probe is considered faulty; otherwise, no probe fault has occurred.

[0125] Figure 3 A schematic diagram of a blood oxygen probe whose light-receiving part uses a silicon photovoltaic cell is provided as an embodiment of the present invention, as shown below. Figure 3 As shown, it comprises two parts: light-emitting and light-receiving. The light-emitting tubes include light-emitting tube 1, light-emitting tube 2, and light-emitting tube n. The light-receiving part uses a silicon photovoltaic cell. The cathode wires of each light-emitting tube and the anode of the silicon photovoltaic cell are all grounded and share a single wire.

[0126] The blood oxygen detection sequence is as follows:

[0127] Blood oxygen detection sequence 1: LED 1 is turned on, and at the same time, the silicon photocell receives the light signal and converts it into an electrical signal through the amplification circuit to obtain signal 1.

[0128] Blood oxygen detection sequence 2: LED 2 is turned on, and at the same time, the silicon photocell receives the light signal and converts it into an electrical signal through the amplification circuit to obtain signal 2.

[0129] Blood oxygen detection sequence 3: LED n (optional LED) is turned on, and at the same time, the silicon photocell receives the light signal and converts it into an electrical signal through the amplification circuit to obtain signal n.

[0130] Blood oxygen detection sequence 4: All LEDs are turned off, and at the same time, the silicon photocell receives the light signal and converts it into an electrical signal through the amplification circuit to obtain signal 4.

[0131] The above process is a complete blood oxygen detection sequence. The light-emitting tube n is an optional light-emitting tube, and the number of light-emitting tube n is greater than or equal to 0.

[0132] 1) Collect the necessary signals:

[0133] At pulse oximetry detection times 1, 2, 3, and 4, the voltages across LEDs 1, 2, and n are measured, yielding voltages 1, 2, and n respectively. These voltages are compared with the LED on-state voltage drop; the maximum on-state voltage drop is threshold voltage 1, and the minimum is threshold voltage 2. The output range of the silicon photovoltaic cell cathode and anode signals after amplification is determined, with the maximum value being threshold voltage 1 and the minimum value being threshold voltage 2. The output status of the current limiting circuit, along with the overall condition of the output circuit, is used to determine whether a pulse oximetry probe malfunction has occurred.

[0134] 2) Compare the collected signal with the threshold:

[0135] If the voltage across the LED during testing is greater than the maximum forward conduction voltage, it is considered to be in an open circuit state.

[0136] If the voltage across the LED during testing is less than the minimum forward conduction voltage, it is considered to be in a short-circuit state.

[0137] If the voltage across a non-functional LED is greater than the minimum forward conduction voltage, it is considered that its cathode or anode is short-circuited with other wires.

[0138] If the output of a silicon photovoltaic cell after amplification is less than the minimum output range or greater than the maximum output range when the LED is in normal operation, then the silicon photovoltaic cell is considered to have a short circuit or open circuit.

[0139] 3) Determine the probe's fault status based on the comparison results:

[0140] a. Determining if the circuit is open:

[0141] Light-emitting diode 1 anode lead open circuit: During blood oxygen detection timing 1, voltage 1 is measured to be greater than voltage threshold 1. During blood oxygen detection timing 1, signal 1 is measured to be less than signal threshold 2.

[0142] Light-emitting diode 2 anode lead open circuit: During blood oxygen detection timing 2, voltage 2 is measured to be greater than voltage threshold 1. During blood oxygen detection timing 2, signal 2 is measured to be less than signal threshold 2.

[0143] An open circuit occurs in the anode lead of the LED n: At pulse oximetry timing 3, the measured voltage n is greater than the voltage threshold 1. At pulse oximetry timing 3, the measured signal n is less than the signal threshold 2.

[0144] Open circuit in the cathode lead of the silicon photovoltaic cell: During blood oxygen detection timing sequence 1, 2, and 3, the measured signals 1, 2, and n are less than the signal threshold 2.

[0145] Grounding interruption: During blood oxygen detection timing 1, signal 1 is less than the minimum threshold 2; during blood oxygen detection timing 2, signal 2 is less than the minimum threshold 2; during blood oxygen detection timing 3, signal n is less than the signal threshold 2.

[0146] b. Determining short circuit conditions:

[0147] A short circuit occurs between the anode of LED 1 and the anode of LED 2: During pulse oximetry detection sequence 1, the measured voltage 2 is greater than the voltage threshold 2. During pulse oximetry detection sequence 2, the measured voltage 1 is greater than the voltage threshold 2.

[0148] A short circuit occurs between the anode of LED 1 and the anode of LED n: During pulse oximetry detection sequence 1, the measured voltage n is greater than the voltage threshold 2. During pulse oximetry detection sequence 3, the measured voltage 1 is greater than the voltage threshold 2.

[0149] A short circuit occurs between the anode of LED1 and the cathode wire of the silicon photovoltaic cell: During blood oxygen detection timing 1, the measured signal 1 is less than the signal threshold 2.

[0150] When a short circuit occurs between the anode of LED1 and the ground wire, during blood oxygen detection timing 1, the current overcurrent signal is an effective value, and signal 1 is less than signal threshold 2.

[0151] A short circuit occurs between the anode of LED 2 and the anode of LED n: During pulse oximetry detection sequence 2, the measured voltage n is greater than the voltage threshold 1. During pulse oximetry detection sequence 3, the measured voltage 2 is greater than the voltage threshold 1.

[0152] A short circuit occurs between the anode of LED 2 and the cathode wire of the silicon photovoltaic cell: during blood oxygen detection timing 2, the measured signal 2 is less than the signal threshold 2.

[0153] When a short circuit occurs between the anode of LED 2 and the ground wire, during blood oxygen detection timing 2, the current overcurrent signal is an effective value, and signal 2 is less than signal threshold 2.

[0154] A short circuit occurs between the anode of the LED n and the cathode wire of the silicon photovoltaic cell: at blood oxygen detection time 3, the measured signal n is less than the signal threshold 2.

[0155] When a short circuit occurs between the anode of LED n and the ground wire, during blood oxygen detection timing 3, the current overcurrent signal is an effective value, and the signal n is less than the signal threshold 2.

[0156] When a short circuit occurs between the cathode wire and the ground wire of a silicon photovoltaic cell, during blood oxygen detection timings 1, 2, and 3, signals 1, 2, and n are less than the signal threshold 2.

[0157] The probe fault status is determined based on the comparison results. If either an open circuit or a short circuit occurs during the probe fault inspection process, the probe is considered faulty; otherwise, no probe fault has occurred.

[0158] As can be seen, the method provided in this embodiment of the invention first acquires fault detection points and their fault detection information, then acquires the detection signal measured during the target blood oxygen detection time sequence based on the fault detection information, and finally compares the detection signal measured during the target blood oxygen detection time sequence with the threshold corresponding to the detection signal, and determines the detection result corresponding to the fault detection information of the fault detection point based on the comparison result. Since the detection signal used for blood oxygen probe fault detection is simultaneously measured during the blood oxygen detection time sequence, and the fault check result is determined based on the relationship between the detection signal and the threshold during the blood oxygen detection process, the synchronous acquisition of blood oxygen signal and detection of probe faults are achieved. Blood oxygen signal acquisition is not affected during blood oxygen probe fault detection, avoiding the impact of blood oxygen signal interruption on blood oxygen calculation during the blood oxygen probe fault detection process. Furthermore, the fault detection point includes at least the light-emitting diode of the blood oxygen probe, the wire connected to the light-emitting diode, the light-receiving component of the blood oxygen probe, and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit. When all fault detection points are detected, comprehensive fault detection of the blood oxygen probe is achieved as much as possible.

[0159] In the above embodiments, the method for detecting pulse oximeter faults has been described in detail. This invention also provides embodiments corresponding to a pulse oximeter fault detection device. It should be noted that the embodiments of the device portion are described from the perspective of functional modules.

[0160] Figure 4 This is a schematic diagram of a pulse oximeter fault detection device provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the pulse oximeter fault detection device includes:

[0161] The first acquisition module 10 is used to acquire fault detection points and fault detection information of the fault detection points; wherein, the fault detection point includes at least the light-emitting tube of the pulse oximeter, the wire connected to the light-emitting tube, the light-receiving component of the pulse oximeter and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit.

[0162] The second acquisition module 11 is used to acquire the detection signal measured during the target blood oxygen detection timing based on the fault detection information of the fault detection point; wherein, the detection signal includes at least the voltage signal at both ends of the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe;

[0163] The comparison and determination module 12 is used to compare the detection signal measured during the target blood oxygen detection time sequence with the threshold corresponding to the detection signal during the blood oxygen detection process, and determine the detection result corresponding to the fault detection information of the fault detection point based on the comparison result.

[0164] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0165] The above provides a detailed description of the pulse oximeter probe fault detection method and apparatus provided by the present invention. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principle of the invention, and these improvements and modifications also fall within the protection scope of the present invention.

[0166] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for detecting faults in a pulse oximeter probe, characterized in that, The method, applied to a pulse oximeter fault detection device, includes: Acquire fault detection points and fault detection information for those points; wherein, the fault detection point includes at least the light-emitting diode of the pulse oximeter, the wire connected to the light-emitting diode, the light-receiving component of the pulse oximeter, and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit; The detection signal obtained during the target blood oxygen detection timing is obtained based on the fault detection information of the fault detection point; wherein, the detection signal includes at least the voltage signal at both ends of the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe; During blood oxygen detection, the detection signal measured during the target blood oxygen detection time sequence is compared with the threshold corresponding to the detection signal, and the detection result corresponding to the fault detection information of the fault detection point is determined based on the comparison result.

2. The pulse oximeter fault detection method according to claim 1, characterized in that, The pulse oximeter probe has multiple light-emitting diodes, and during the pulse oximeter detection process, each light-emitting diode emits light in turn according to the pulse oximeter detection sequence; the light-receiving component is a photosensitive tube or a silicon photocell. When the light-receiving component is a phototube, the wires connected to the light-receiving component are the power supply wire of the phototube, the output wire of the phototube, and the grounding wire of the phototube; When the light-receiving component is a silicon photovoltaic cell, the wires connected to the light-receiving component are silicon photovoltaic cell cathode wires and silicon photovoltaic cell anode wires.

3. The pulse oximeter fault detection method according to claim 2, characterized in that, The detection signal is the voltage signal across the LED and the output signal. The threshold corresponding to the voltage signal is a first voltage threshold and a second voltage threshold, where the first voltage threshold is greater than the second voltage threshold. The threshold corresponding to the output signal is a first signal threshold and a second signal threshold, where the first signal threshold is greater than the second signal threshold.

4. The pulse oximeter fault detection method according to claim 3, characterized in that, If the fault detection information of the fault detection point is the open circuit of the anode wire of the current light-emitting diode, then the target blood oxygen detection timing is the blood oxygen detection timing corresponding to the current light-emitting diode emitting light. The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes: The voltage signal across the current LED measured during the target blood oxygen detection timing is compared with the first voltage threshold, and the frequency of the output signal during the target blood oxygen detection timing is compared with the second signal threshold. If the comparison result shows that the voltage signal at both ends of the current LED is greater than the first voltage threshold and the frequency of the output signal is less than the second signal threshold, then it is determined that the anode wire of the current LED is open-circuited.

5. The pulse oximeter fault detection method according to claim 3, characterized in that, If the fault detection information of the fault detection point is a broken wire connected to the light receiving component, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of each light-emitting tube. The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes: The frequency of the output signal obtained during each of the target blood oxygen detection time sequences is compared with the second signal threshold. If the comparison result shows that the frequency of the output signal obtained in each of the target blood oxygen detection timings is less than the second signal threshold, then it is determined that the wire connected to the light receiving component is broken.

6. The pulse oximeter fault detection method according to claim 3, characterized in that, If the fault detection information at the fault detection point is a short circuit between the anode of the first LED and the anode of the second LED, then the target blood oxygen detection timing sequence is the first target blood oxygen detection timing sequence and the second target blood oxygen detection timing sequence; wherein, the first target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to when the first LED emits light, and the second target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to when the second LED emits light. The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes: The voltage signal across the second LED obtained during the first target blood oxygen detection timing is compared with the second voltage threshold, and the voltage signal across the first LED obtained during the second target blood oxygen detection timing is compared with the second voltage threshold; If the comparison result shows that the voltage signal across the second light-emitting diode obtained during the first target blood oxygen detection timing is greater than the second voltage threshold, and the voltage signal across the first light-emitting diode obtained during the second target blood oxygen detection timing is greater than the second voltage threshold, then it is determined that a short circuit has occurred between the anode of the first light-emitting diode and the anode of the second light-emitting diode.

7. The pulse oximeter fault detection method according to claim 3, characterized in that, If the fault detection information of the fault detection point is a short circuit between the anode of the current light-emitting diode and the power supply wire of the photosensitive diode, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the light emission of other light-emitting diodes; wherein, the other light-emitting diodes are all light-emitting diodes except the current light-emitting diode. The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes: During each of the target blood oxygen detection timing sequences, the voltage signal at both ends of the current light-emitting diode is compared with the first voltage threshold. If the comparison result shows that the voltage signal at both ends of the current light-emitting diode is greater than the first voltage threshold during the detection timing of each target blood oxygenation, then it is determined that the anode of the current light-emitting diode is short-circuited with the power supply wire of the photosensitive tube.

8. The pulse oximeter fault detection method according to claim 3, characterized in that, If the fault detection information of the fault detection point is a preset short circuit condition, then the target blood oxygen detection timing is the blood oxygen detection timing corresponding to the current light-emitting diode emitting light; wherein, the preset short circuit condition is a short circuit between the anode of the current light-emitting diode and the output wire of the photosensitive diode, a short circuit between the anode of the current light-emitting diode and the ground wire of the photosensitive diode, a short circuit between the anode of the current light-emitting diode and the cathode wire of the silicon photovoltaic cell, or a short circuit between the anode of the current light-emitting diode and the anode wire of the silicon photovoltaic cell; The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes: The frequency of the output signal obtained during the target blood oxygen detection timing is compared with the second signal threshold. If the comparison result shows that the frequency of the output signal obtained during the target blood oxygen detection timing is less than the second signal threshold, then the preset short circuit condition is determined to be true.

9. The pulse oximeter fault detection method according to claim 3, characterized in that, If the fault detection information of the fault detection point is a short circuit between different wires connected to the light receiving component, then the target blood oxygen detection timing sequence is the blood oxygen detection timing sequence corresponding to the emission of each light-emitting tube; wherein, the short circuit between different wires connected to the light receiving component includes at least the short circuit between the power supply wire and the output wire of the phototube, the short circuit between the power supply wire and the ground wire of the phototube, the short circuit between the output wire and the ground wire of the phototube, and the short circuit between the cathode wire and the anode wire of the silicon photovoltaic cell; The step of comparing the detection signal obtained during the target blood oxygen detection time series with the threshold corresponding to the detection signal, and determining the detection result corresponding to the fault detection information of the fault detection point based on the comparison result, includes: The frequency of the output signal obtained during each of the target blood oxygen detection time sequences is compared with the second signal threshold. If the comparison result shows that the frequency of the output signal obtained in each of the target blood oxygen detection timings is less than the second signal threshold, then it is determined that there is a short circuit between the different wires connected to the light receiving component.

10. A pulse oximeter fault detection device, characterized in that, include: The first acquisition module is used to acquire fault detection points and fault detection information of the fault detection points; wherein, the fault detection point includes at least the light-emitting tube of the pulse oximeter, the wire connected to the light-emitting tube, the light-receiving component of the pulse oximeter and / or the wire connected to the light-receiving component; the fault detection information includes short circuit or open circuit; The second acquisition module is used to acquire the detection signal measured during the target blood oxygen detection time sequence based on the fault detection information of the fault detection point; wherein, the detection signal includes at least the voltage signal at both ends of the light-emitting diode and the output signal of the light-receiving component of the blood oxygen probe; The comparison and determination module is used to compare the detection signal measured during the target blood oxygen detection time sequence with the threshold corresponding to the detection signal during the blood oxygen detection process, and determine the detection result corresponding to the fault detection information of the fault detection point based on the comparison result.

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