Artery-vein identification device, artery-vein identification method, program, and non-transitory computer-readable recording medium

Abstract

SOLUTION: An artery-vein identification device 12 comprises: an oxygen saturation acquisition unit 70 configured to acquire oxygen saturation of blood in a needle hub 24 holding a needle 14 inserted into a blood vessel; a movement speed acquisition unit 72 configured to acquire the movement speed of the blood level moving within the needle hub; and a determination unit 74 configured to determine, based on the oxygen saturation and the movement speed, whether the blood vessel punctured by the needle is an artery or a vein.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an artery and vein identifying device, an artery and vein identifying method, a program, and a computer-readable non-transitory recording medium. [Background technology]

[0002] Patent Document 1 listed below discloses a blood type determination set that determines whether collected blood is arterial blood or venous blood. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5032653 Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, there has been a demand for a better artery / vein identifying device, artery / vein identifying method, program, and computer-readable non-transitory recording medium. [Means for solving the problem]

[0005] (1) A first aspect of the present disclosure is an arteriovenous identification device comprising: an oxygen saturation acquisition unit that acquires the oxygen saturation of blood in a needle hub that holds a needle body to be inserted into a blood vessel; a movement speed acquisition unit that acquires the movement speed of the blood surface moving within the needle hub; and a determination unit that determines whether the blood vessel punctured by the needle body is an artery or a vein based on the oxygen saturation and the movement speed.

[0006] The artery and vein identifying device determines whether the blood vessel punctured by the needle is an artery or a vein based on the oxygen saturation level and the moving speed, thereby improving the accuracy of the determination.

[0007] (2) In the artery and vein identification device described in item (1) above, the determination unit may determine whether the blood vessel punctured by the needle body is an artery or a vein based on the comparison result between the oxygen saturation level and an oxygen saturation threshold value and the comparison result between the movement speed and a movement speed threshold value.

[0008] The arteriovenous identification device determines whether the blood vessel punctured by the needle is an artery or a vein based on the results of comparing the oxygen saturation level with the oxygen saturation threshold and the results of comparing the movement speed with the movement speed threshold, thereby improving the accuracy of the determination.

[0009] (3) The artery and vein identification device described in item (2) above may further include a vital data acquisition unit that acquires vital data of a patient, wherein the determination unit sets the oxygen saturation threshold and the movement speed threshold based on the vital data and a trained model, and the trained model may be a machine learning model that has been trained by machine learning to output the oxygen saturation threshold and the movement speed threshold in response to input of the vital data.

[0010] The artery and vein identifying device sets an oxygen saturation threshold and a movement speed threshold according to the patient's vital data, thereby improving the accuracy of determining whether the blood vessel punctured by the needle is an artery or a vein.

[0011] (4) The artery and vein identification device according to any one of items (1) to (3) above may further include a measuring device attachable to the needle hub, the measuring device having an oximeter probe, a first position sensor, and a second position sensor, the oximeter probe having a first light-projecting unit that projects light toward the inner cavity of the needle hub and a first light-receiving unit that receives the light projected by the first light-projecting unit, the first position sensor having a second light-projecting unit that projects light toward the inner cavity of the needle hub and a second light-receiving unit that receives the light projected by the second light-projecting unit, the second position sensor having a third light-projecting unit that projects light toward the inner cavity of the needle hub and a third light-receiving unit that receives the light projected by the third light-projecting unit, and the first position sensor and the second position sensor may be spaced apart from each other in the longitudinal direction of the needle hub.

[0012] The artery and vein identification device can measure the amount of light received by each of the first, second, and third light receiving units using a measuring device, thereby determining the oxygen saturation of the blood in the needle hub and the moving speed of the blood surface in the needle hub.

[0013] (5) The arteriovein identification device described in item (4) above may further include an oxygen saturation calculation unit that calculates the oxygen saturation based on the amount of light received by the first light receiving unit, and a movement speed calculation unit that calculates the movement speed based on the time when the amount of light received by the second light receiving unit changes by a predetermined amount or more and the time when the amount of light received by the third light receiving unit changes by a predetermined amount or more.

[0014] The arteriovein identifying device can calculate the oxygen saturation of the blood in the needle hub using the oxygen saturation calculating unit, and can calculate the moving speed of the blood surface in the needle hub using the moving speed calculating unit.

[0015] (6) In the artery and vein identification device described in the above item (4) or (5), the needle hub has a hub body to which the needle body is fixed and an attachment part to which the measuring device is attached, and the attachment part may be translucent.

[0016] Because the attachment section is translucent, in the artery and vein identification device, light from the first light-emitting section can pass through the needle hub and the light from the first light-emitting section can be received by the first light-receiving section. Similarly, in the artery and vein identification device, light from the second light-emitting section can pass through the needle hub and the light from the second light-emitting section can be received by the second light-receiving section. Furthermore, in the artery and vein identification device, light from the third light-emitting section can pass through the needle hub and the light from the third light-emitting section can be received by the third light-receiving section.

[0017] (7) In the artery and vein identification device described in any one of items (4) to (6) above, the needle hub has a hub body to which the needle body is fixed and a position sensor mounting portion to which the first position sensor and the second position sensor are mounted, and the inner diameter of the cavity of the position sensor mounting portion is smaller than the inner diameter of the cavity of the hub body.

[0018] The arteriovein identifying device can increase the difference between the speed at which the blood surface moves inside the position sensor mounting part when the blood pressure in the blood vessel punctured by the needle is high and the speed at which the blood surface moves inside the position sensor mounting part when the blood pressure in the blood vessel punctured by the needle is low, thereby improving the accuracy of determining whether the blood vessel punctured by the needle is an artery or a vein.

[0019] (8) In the artery and vein identification device described in any one of items (4) to (7) above, the needle hub has a hub body to which the needle body is fixed and a position sensor mounting part to which the first position sensor and the second position sensor are mounted, and a marker that moves with the blood level moving through the lumen of the position sensor mounting part may be provided in the lumen of the position sensor mounting part.

[0020] The artery and vein identifying device can determine the moving speed of the blood surface in the needle hub based on the positions of the markers detected by the first position sensor and the second position sensor, thereby improving the accuracy of the determined moving speed.

[0021] (9) A second aspect of the present disclosure is a method for identifying arteries and veins, comprising: an oxygen saturation acquisition step of acquiring the oxygen saturation of blood in a needle hub that holds a needle body to be inserted into a blood vessel by an oxygen saturation acquisition unit; a movement speed acquisition step of acquiring the movement speed of the blood surface moving within the needle hub by a movement speed acquisition unit; and a determination step of determining whether the blood vessel punctured by the needle body is an artery or a vein by a determination unit based on the oxygen saturation and the movement speed.

[0022] The artery and vein distinguishing method determines whether the blood vessel punctured by the needle is an artery or a vein based on the oxygen saturation level and the movement speed, thereby improving the accuracy of the determination.

[0023] (10) A third aspect of the present disclosure is a program that causes a computer to execute the artery-vein identifying method described in item (9) above.

[0024] A computer that executes the artery and vein identifying method in accordance with the program determines whether the blood vessel punctured by the needle is an artery or a vein based on the oxygen saturation level and the movement speed, thereby improving the accuracy of the determination.

[0025] (11) A fourth aspect of the present disclosure is a computer-readable non-transitory recording medium storing the program described in item (10) above.

[0026] A computer that executes the artery and vein identification method according to the program stored in the storage medium determines whether the blood vessel punctured by the needle is an artery or a vein based on the oxygen saturation level and the movement speed, thereby improving the accuracy of the determination. [Effects of the Invention]

[0027] According to the present invention, it is possible to improve the accuracy of determining whether the blood vessel punctured by the needle is an artery or a vein. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a schematic diagram showing an indwelling needle and an artery and vein identifying device attached to the indwelling needle. [Figure 2] FIG. 2 is a diagram showing a state in which the needle body has been inserted into a patient's blood vessel. [Figure 3] 3A and 3B are diagrams showing the state in which the needle body has been inserted into the patient's blood vessel. [Figure 4] FIG. 4 is a block diagram showing the configuration of the detector. [Figure 5] FIG. 5 is a block diagram showing the configuration of the determiner. [Figure 6] FIG. 6 is a flowchart of the determination process performed in the determiner. [Figure 7] FIG. 7 is a schematic cross-sectional view of a needle hub. [Figure 8] FIG. 8 is a flowchart of the determination process performed in the determiner. DETAILED DESCRIPTION OF THE INVENTION

[0029] Typically, arterial blood is bright red, while venous blood is dark red. Therefore, conventionally, surgeons determine whether a punctured blood vessel is arterial or venous based on the color of the blood that flashes back inside the needle hub when the needle is inserted into the blood vessel. However, there is a problem with the accuracy of the determination varying depending on the surgeon. Furthermore, in patients with relatively low blood oxygen saturation, the color of arterial blood may be dark red, which reduces the accuracy of the surgeon's determination.

[0030] The present disclosure can improve the accuracy of determining whether the blood vessel punctured by the needle is an artery or a vein.

[0031] [First embodiment] 1 is a schematic diagram showing an indwelling needle 10 and an arteriovenous identification device 12 attached to the indwelling needle 10. The indwelling needle 10 is used to place a catheter in a patient's vein during treatment such as intravenous drip. The arteriovenous identification device 12 is a device that determines whether the blood vessel punctured by the needle body 14 of the indwelling needle 10 is an artery or a vein.

[0032] The artery and vein identifying device 12 will be described below using the artery and vein identifying device 12 attached to the indwelling needle 10 as an example, but the artery and vein identifying device 12 may be attached to a device other than the indwelling needle 10. For example, the artery and vein identifying device 12 may be attached to an introduction needle for introducing a wire guide into a blood vessel.

[0033] [Configuration of indwelling needle] The indwelling needle 10 has a catheter member 16 and a puncture member 18. The catheter member 16 has a catheter shaft 20 and a catheter hub 22. The catheter shaft 20 is a flexible tubular member that can be continuously inserted into a patient's blood vessel. The catheter hub 22 is provided at the proximal end of the catheter shaft 20 and holds the catheter shaft 20. The catheter hub 22 is formed in a cylindrical shape, and the lumen of the catheter hub 22 communicates with the lumen of the catheter shaft 20.

[0034] The puncture member 18 has a needle body 14 and a needle hub 24. The needle body 14 is a rigid tubular member capable of puncturing the skin of a patient. The needle body 14 is inserted into the lumen of the catheter hub 22 and the lumen of the catheter shaft 20. The needle hub 24 is provided at the base end of the needle body 14 and holds the needle body 14. The needle hub 24 is formed in a cylindrical shape, and the lumen of the needle hub 24 communicates with the lumen of the needle body 14.

[0035] The needle hub 24 has a hub body 26 and an attachment portion 28. The needle body 14 is fixed to the hub body 26. A measuring instrument 30 of the artery and vein identification device 12, which will be described later, is attached to the attachment portion 28. At least the attachment portion 28 of the needle hub 24 is translucent. When the needle body 14 punctures a blood vessel, blood passes through the lumen of the needle body 14 and flashes back into the lumen of the needle hub 24.

[0036] [Configuration of the artery and vein identification device] The artery and vein identification device 12 has a measuring device 30, a detector 32, and a determiner 34. The measuring device 30 and the detector 32 are connected via a communication cable. The detector 32 and the determiner 34 are connected via a communication cable. The measuring device 30 and the detector 32 may communicate via wireless communication. The detector 32 and the determiner 34 may communicate via wireless communication.

[0037] (Measuring instrument configuration) The measuring device 30 can be attached to the attachment portion 28 of the needle hub 24. After treatment, the measuring device 30 is detached from the needle hub 24 and can be used repeatedly. The measuring device 30 has an oximeter probe 36, a first position sensor 38, and a second position sensor 40.

[0038] The oximeter probe 36 has a first light-emitting unit 42 and a first light-receiving unit 44. When the measuring device 30 is attached to the attachment portion 28 of the needle hub 24, the first light-emitting unit 42 and the first light-receiving unit 44 are disposed on the outer periphery of the needle hub 24.

[0039] The first light-receiving unit 44 is provided at a position facing the first light-emitting unit 42 across the needle hub 24. The first light-emitting unit 42 emits red light and infrared light toward the inner cavity of the needle hub 24, and the first light-receiving unit 44 receives the light emitted by the first light-emitting unit 42. When blood flashes back into the inner cavity of the needle hub 24, the first light-receiving unit 44 receives the light from the first light-emitting unit 42 that has passed through the blood in the inner cavity of the needle hub 24.

[0040] 2 is a diagram showing the state in which the needle body 14 has been inserted into the patient's blood vessel, and shows the state in which blood has flashed back to the position of the oximeter probe 36.

[0041] The higher the oxygen saturation of the blood, the brighter the red color of the blood, and the lower the oxygen saturation of the blood, the darker the red color of the blood. The amount of red light received by the first light receiving unit 44 changes depending on the color of the blood. On the other hand, even if the color of the blood changes, the amount of infrared light received by the first light receiving unit 44 remains almost unchanged. This makes it possible to determine the oxygen saturation of the blood in the needle hub 24 from the ratio between the amount of red light received by the first light receiving unit 44 and the amount of infrared light received. Because the oxygen saturation of arterial blood is higher than the oxygen saturation of venous blood, it is possible to determine whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the oxygen saturation of the blood in the needle hub 24.

[0042] First position sensor 38 has a second light-emitting unit 46 and a second light-receiving unit 48. When measuring device 30 is attached to attachment portion 28 of needle hub 24, second light-emitting unit 46 and second light-receiving unit 48 are disposed on the outer periphery of needle hub 24.

[0043] The second light receiving unit 48 is provided at a position facing the second light transmitting unit 46 across the needle hub 24. The second light transmitting unit 46 transmits light toward the inner cavity of the needle hub 24, and the second light receiving unit 48 receives the light transmitted by the second light transmitting unit 46. That is, the second light receiving unit 48 receives the light transmitted by the second light transmitting unit 46 that has passed through the needle hub 24. The light transmitted by the second light transmitting unit 46 is, for example, infrared light. The light transmitted by the second light transmitting unit 46 is not particularly limited as long as it is light other than red light.

[0044] The amount of light received by second light-receiving unit 48 changes before and after blood passes between second light-projecting unit 46 and second light-receiving unit 48. Therefore, the point in time when the amount of light received by second light-receiving unit 48 changes by a predetermined amount or more can be regarded as the point in time when blood has passed between second light-projecting unit 46 and second light-receiving unit 48.

[0045] The second position sensor 40 has a third light-emitting unit 50 and a third light-receiving unit 52. When the measuring device 30 is attached to the attachment portion 28 of the needle hub 24, the third light-emitting unit 50 and the third light-receiving unit 52 are disposed on the outer periphery of the needle hub 24.

[0046] The third light receiving unit 52 is provided at a position facing the third light emitting unit 50 across the needle hub 24. The third light emitting unit 50 emits light toward the inner cavity of the needle hub 24, and the third light receiving unit 52 receives the light emitted by the third light emitting unit 50. That is, the third light receiving unit 52 receives the light from the third light emitting unit 50 that has passed through the needle hub 24. The light emitted by the third light emitting unit 50 is, for example, infrared light. The light emitted by the third light emitting unit 50 is not particularly limited as long as it is light other than red light.

[0047] The amount of light received by the third light-receiving unit 52 changes before and after blood passes between the third light-projecting unit 50 and the third light-receiving unit 52. Therefore, the point in time when the amount of light received by the third light-receiving unit 52 changes by a predetermined amount or more can be regarded as the point in time when blood has passed between the third light-projecting unit 50 and the third light-receiving unit 52.

[0048] The first position sensor 38 and the second position sensor 40 are spaced apart in the longitudinal direction of the needle hub 24 .

[0049] 3A and 3B are diagrams showing the state in which the needle body 14 has been inserted into the patient's blood vessel. Fig. 3A shows the state in which blood has flashed back to the position of the first position sensor 38. Fig. 3B shows the state in which blood has flashed back to the position of the second position sensor 40.

[0050] The higher the blood pressure, the faster the movement speed of the flashed-back blood surface inside the needle hub 24. The movement speed of the blood surface inside the needle hub 24 can be determined from the point in time when the blood passes between the second light projecting unit 46 and the second light receiving unit 48, and the point in time when the blood passes between the third light projecting unit 50 and the third light receiving unit 52. Because arterial blood pressure is higher than venous blood pressure, it can be determined whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the movement speed of the blood surface inside the needle hub 24.

[0051] (Detector configuration) 4 is a block diagram showing the configuration of the detector 32. The detector 32 has a calculation unit 54 and a storage unit 56. The calculation unit 54 is a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The calculation unit 54 has an oxygen saturation calculation unit 58 and a movement speed calculation unit 60. The oxygen saturation calculation unit 58 and the movement speed calculation unit 60 are realized by the calculation unit 54 executing a program stored in the storage unit 56. At least a portion of the oxygen saturation calculation unit 58 and the movement speed calculation unit 60 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). At least a portion of the oxygen saturation calculation unit 58 and the movement speed calculation unit 60 may be realized by an electronic circuit including discrete devices.

[0052] The storage unit 56 is a computer-readable, non-transitory, tangible storage medium. The storage unit 56 is composed of a volatile memory (not shown) and a non-volatile memory (not shown). The volatile memory is, for example, a random access memory (RAM). The non-volatile memory is, for example, a read-only memory (ROM), a flash memory, etc. Data, etc., are stored in the volatile memory. Programs, tables, maps, etc., are stored in the non-volatile memory. At least a portion of the storage unit 56 may be included in the processor, integrated circuit, etc. described above. At least a portion of the storage unit 56 may be installed in a device connected to the detector 32 via a network.

[0053] The oxygen saturation calculation unit 58 acquires information indicating the amount of light received by the first light receiving unit 44 from the oximeter probe 36 of the measurement device 30. The oxygen saturation calculation unit 58 calculates the oxygen saturation of the blood in the needle hub 24 based on the amount of light received by the first light receiving unit 44.

[0054] The movement speed calculation unit 60 acquires information indicating the amount of light received by the second light receiving unit 48 from the first position sensor 38 of the measuring device 30. The movement speed calculation unit 60 also acquires information indicating the amount of light received by the third light receiving unit 52 from the second position sensor 40 of the measuring device 30. The movement speed calculation unit 60 calculates the movement speed of the blood surface moving inside the needle hub 24 based on the time point when the amount of light received by the second light receiving unit 48 changes by more than a predetermined amount and the time point when the amount of light received by the third light receiving unit 52 changes by more than a predetermined amount.

[0055] The detector 32 may be a mobile terminal, a personal computer, or the like, on which software for executing a program that realizes the functions of the detector 32 is installed.

[0056] The oxygen saturation calculation unit 58 and the movement speed calculation unit 60 may be included in a device other than the detector 32. This device other than the detector 32 may be any device that can communicate with the measuring device 30, and may be, for example, a device provided on the cloud.

[0057] [Configuration of the decision unit] 5 is a block diagram showing the configuration of the determiner 34. The determiner 34 includes a calculation unit 62 and a storage unit 64. The calculation unit 62 is a processor such as a CPU or a GPU. The calculation unit 62 includes a vital data acquisition unit 66, a threshold setting unit 68, an oxygen saturation acquisition unit 70, a moving speed acquisition unit 72, a determination unit 74, a display control unit 76, and a machine learning unit 78. The vital data acquisition unit 66, the threshold setting unit 68, the oxygen saturation acquisition unit 70, the moving speed acquisition unit 72, the determination unit 74, the display control unit 76, and the machine learning unit 78 are realized by the calculation unit 62 executing a program stored in the storage unit 64. At least a portion of the vital data acquisition unit 66, the threshold setting unit 68, the oxygen saturation acquisition unit 70, the moving speed acquisition unit 72, the determination unit 74, the display control unit 76, and the machine learning unit 78 may be realized by an integrated circuit such as an ASIC or an FPGA. At least a portion of the vital data acquisition unit 66, threshold setting unit 68, oxygen saturation acquisition unit 70, movement speed acquisition unit 72, judgment unit 74, display control unit 76 and machine learning unit 78 may be realized by electronic circuits including discrete devices.

[0058] The storage unit 64 is a computer-readable, non-transitory, tangible storage medium. The storage unit 64 is configured by a volatile memory (not shown) and a non-volatile memory (not shown). The volatile memory is, for example, a RAM. The non-volatile memory is, for example, a ROM, a flash memory, etc. Data, etc. are stored in the volatile memory. Programs, tables, maps, etc. are stored in the non-volatile memory, for example. At least a part of the storage unit 64 may be provided in the above-mentioned processor, integrated circuit, etc. At least a part of the storage unit 64 may be mounted on a device connected to the determiner 34 via a network.

[0059] The vital data acquiring unit 66 acquires vital data of the patient. Examples of the vital data of the patient include blood pressure and blood oxygen saturation. The vital data of the patient is measured by a device separate from the artery and vein identification device 12 and input from the separate device to the artery and vein identification device 12. The vital data of the patient may be input to the determiner 34 by the surgeon using the input unit 80. The input unit 80 may be provided in the determiner 34 or may be provided outside the determiner 34.

[0060] The threshold setting unit 68 sets an oxygen saturation threshold and a movement speed threshold. The oxygen saturation threshold and the movement speed threshold are thresholds for determining whether the blood vessel punctured by the needle body 14 is an artery or a vein. The oxygen saturation threshold and the movement speed threshold are set based on a trained model, which will be described later. The oxygen saturation threshold and the movement speed threshold may be predetermined fixed values. The oxygen saturation threshold and the movement speed threshold may also be set by the surgeon.

[0061] The oxygen saturation acquiring unit 70 acquires oxygen saturation information indicating the oxygen saturation calculated by the oxygen saturation calculating unit 58 of the detector 32. The movement speed acquiring unit 72 acquires movement speed information indicating the movement speed calculated by the movement speed calculating unit 60 of the detector 32.

[0062] The determination unit 74 determines whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the comparison result between the oxygen saturation level and the oxygen saturation threshold and the comparison result between the movement speed and the movement speed threshold.

[0063] The display control unit 76 controls the display unit 82 to display the determination result by the determination unit 74. The display unit 82 may be provided in the determiner 34 or may be provided outside the determiner 34.

[0064] The machine learning unit 78 generates a trained model through machine learning. The trained model is a machine learning model that has been trained to output an oxygen saturation threshold and a movement speed threshold in response to input of vital data of a patient.

[0065] The surgeon judges whether the judgment result by the judgment unit 74 displayed on the display unit 82 is correct or incorrect. The surgeon uses the input unit 80 to input the judgment result to the judger 34. The machine learning unit 78 performs machine learning using the information on the judgment result of correctness input by the surgeon as training data.

[0066] The determiner 34 may be a mobile terminal, a personal computer, or the like, in which software for executing a program that realizes the function of the determiner 34 is installed.

[0067] The vital data acquisition unit 66, threshold setting unit 68, oxygen saturation acquisition unit 70, movement speed acquisition unit 72, determination unit 74, display control unit 76, and machine learning unit 78 may be included in a device other than the determiner 34. This device other than the determiner 34 may be any device that can communicate with the measuring device 30, and may be, for example, a device provided on the cloud.

[0068] [Determination process] FIG. 6 is a flowchart of the determination process performed by the determiner 34.

[0069] In step S1, the vital data acquisition unit 66 acquires vital data of the patient, and then the process proceeds to step S2.

[0070] In step S2, the oxygen saturation acquiring unit 70 acquires oxygen saturation information indicating the oxygen saturation of the blood in the needle hub 24 calculated by the oxygen saturation calculating unit 58 of the detector 32. Thereafter, the process proceeds to step S3.

[0071] In step S3, the movement speed acquisition unit 72 acquires movement speed information indicating the movement speed of the blood surface in the needle hub 24 calculated by the movement speed calculation unit 60 of the detector 32. Then, the process proceeds to step S4.

[0072] In step S4, the threshold setting unit 68 sets an oxygen saturation threshold and a movement speed threshold based on the vital data and the trained model. Then, the process proceeds to step S5.

[0073] In step S5, the determination unit 74 compares the oxygen saturation of the blood in the needle hub 24 with the oxygen saturation threshold value to determine whether the oxygen saturation is equal to or greater than the oxygen saturation threshold value.

[0074] If it is determined in step S5 that the oxygen saturation of the blood is equal to or higher than the oxygen saturation threshold (step S5: YES), the process proceeds to step S6. In step S6, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. That is, if the oxygen saturation of the blood in the needle hub 24 is equal to or higher than the oxygen saturation threshold, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. Thereafter, the process proceeds to step S10.

[0075] If it is determined in step S5 that the oxygen saturation of the blood is less than the oxygen saturation threshold (step S5: NO), the process proceeds to step S7. In step S7, the determination unit 74 compares the movement speed of the blood surface in the needle hub 24 with the movement speed threshold to determine whether the movement speed is equal to or greater than the movement speed threshold.

[0076] In step S7, if it is determined that the movement speed of the blood surface is less than the movement speed threshold (step S7: NO), the process proceeds to step S8. In step S8, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is a vein. That is, if the oxygen saturation of the blood in the needle hub 24 is less than the oxygen saturation threshold and the movement speed of the blood surface in the needle hub 24 is less than the movement speed threshold, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is a vein. Thereafter, the process proceeds to step S10.

[0077] In step S7, if it is determined that the movement speed of the blood surface is equal to or greater than the movement speed threshold (step S7: YES), the process proceeds to step S9. In step S9, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. That is, if the oxygen saturation of the blood in the needle hub 24 is less than the oxygen saturation threshold and the movement speed of the blood surface in the needle hub 24 is equal to or greater than the movement speed threshold, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. Then, the process proceeds to step S10.

[0078] In step S10, the display control unit 76 causes the display unit 82 to display the determination result by the determination unit 74. Thereafter, the determination process ends.

[0079] When the oxygen saturation of the patient's arterial blood is low, there is a risk of misjudging whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the oxygen saturation of the blood in the needle hub 24. In this embodiment, when the oxygen saturation is below the oxygen saturation threshold, it is determined whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the moving speed of the blood surface in the needle hub 24. This improves the judgment accuracy of the arteriovein identification device 12.

[0080] The surgeon determines whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the patient's vital data, oxygen saturation information, and movement speed information. The surgeon compares the determination result by the determination unit 74 (steps S6, S8, S9) with his or her own determination result, and determines whether the determination result by the determination unit 74 is correct or incorrect. The surgeon uses the input unit 80 to input the determination result into the determiner 34. The machine learning unit 78 performs machine learning using the information on the determination result input by the surgeon as training data.

[0081] If the operator's judgment result is positive, the oxygen saturation threshold and movement speed threshold corresponding to the patient's vital data are not changed. The positive judgment result input by the operator is stored in the determiner 34 as data supporting the reliability of the oxygen saturation threshold and movement speed threshold.

[0082] On the other hand, if the operator's judgment is incorrect, the oxygen saturation threshold and the movement speed threshold corresponding to the patient's vital data are fine-tuned by increasing or decreasing them.

[0083] As a result, the oxygen saturation threshold and the movement speed threshold are optimized, and the accuracy of the determination by the determination unit 74 can be improved.

[0084] [Needle hub lumen structure] 7 is a schematic cross-sectional view of the needle hub 24. As described above, the needle hub 24 has the hub body 26 and the mounting portion 28. The mounting portion 28 further has an oxyprobe mounting portion 84 and a position sensor mounting portion 86. When the meter 30 is mounted on the mounting portion 28, the oximeter probe 36 is disposed on the outer periphery of the oxyprobe mounting portion 84, and the first position sensor 38 and the second position sensor 40 are disposed on the outer periphery of the position sensor mounting portion 86.

[0085] The inner diameter of the lumen of the position sensor mounting portion 86 is smaller than the inner diameter of the lumen of the hub body 26 and the inner diameter of the lumen of the oxyprobe mounting portion 84. As a result, the speed at which the blood surface moves inside the needle hub 24 is increased in the lumen of the position sensor mounting portion 86. This makes it possible to increase the difference between the speed at which the blood surface moves in the position sensor mounting portion 86 when the blood pressure is high and the speed at which the blood surface moves in the position sensor mounting portion 86 when the blood pressure is low.

[0086] 7, a marker 88 may be provided in the lumen of the position sensor mounting section 86. The marker 88 moves together with the blood surface moving through the lumen of the position sensor mounting section 86. In this case, the moving speed of the marker 88 may be set to the moving speed of the blood surface in the needle hub 24.

[0087] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values or mathematical expressions are used in the description of the above-described embodiments. Second Embodiment Although the artery and vein identification device 12 of this embodiment has the same configuration as the artery and vein identification device 12 of the first embodiment, the determination process performed by the determiner 34 of this embodiment is partially different from that of the first embodiment. [Determination process] FIG. 8 is a flowchart of the determination process performed by the determiner 34.

[0088] In step S21, the vital data acquisition unit 66 acquires vital data of the patient, and then the process proceeds to step S22.

[0089] In step S22, the oxygen saturation acquiring unit 70 acquires oxygen saturation information indicating the oxygen saturation of the blood in the needle hub 24 calculated by the oxygen saturation calculating unit 58 of the detector 32. Thereafter, the process proceeds to step S23.

[0090] In step S23, the movement speed acquisition unit 72 acquires movement speed information indicating the movement speed of the blood surface in the needle hub 24 calculated by the movement speed calculation unit 60 of the detector 32. Then, the process proceeds to step S24.

[0091] In step S24, the threshold setting unit 68 sets an oxygen saturation threshold and a movement speed threshold based on the vital data and the trained model. Then, the process proceeds to step S25.

[0092] In step S25, the determination unit 74 compares the oxygen saturation of the blood in the needle hub 24 with the oxygen saturation threshold value to determine whether the oxygen saturation is equal to or greater than the oxygen saturation threshold value.

[0093] If it is determined in step S25 that the oxygen saturation is equal to or greater than the oxygen saturation threshold (step S25: YES), the process proceeds to step S26. In step S26, the determination unit 74 compares the movement speed of the blood surface in the needle hub 24 with the movement speed threshold to determine whether the movement speed is equal to or greater than the movement speed threshold.

[0094] If it is determined in step S26 that the movement speed of the blood surface is equal to or greater than the movement speed threshold (step S26: YES), the process proceeds to step S27. In step S27, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. That is, if the oxygen saturation of the blood in the needle hub 24 is equal to or greater than the oxygen saturation threshold and the movement speed of the blood surface in the needle hub 24 is equal to or greater than the movement speed threshold, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. Then, the process proceeds to step S32.

[0095] If it is determined in step S26 that the movement speed of the blood surface is less than the movement speed threshold (step S26: NO), the process proceeds to step S28. In step S28, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. That is, if the oxygen saturation of the blood in the needle hub 24 is equal to or greater than the oxygen saturation threshold and the movement speed of the blood surface in the needle hub 24 is less than the movement speed threshold, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is an artery. Thereafter, the process proceeds to step S32.

[0096] If it is determined in step S25 that the oxygen saturation level is less than the oxygen saturation threshold level (step S25: NO), the process proceeds to step S29. In step S29, the determination unit 74 compares the movement speed of the blood surface in the needle hub 24 with the movement speed threshold level to determine whether the movement speed is equal to or greater than the movement speed threshold level.

[0097] If it is determined in step S29 that the movement speed of the blood surface is less than the movement speed threshold (step S29: NO), the process proceeds to step S30. In step S30, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is a vein. That is, if the oxygen saturation of the blood in the needle hub 24 is less than the oxygen saturation threshold and the movement speed of the blood surface in the needle hub 24 is less than the movement speed threshold, the determination unit 74 determines that the blood vessel punctured by the needle body 14 is a vein. Thereafter, the process proceeds to step S32.

[0098] If it is determined in step S29 that the movement speed of the blood surface is equal to or greater than the movement speed threshold (step S29: YES), the process proceeds to step S31. In step S31, the determination unit 74 determines that it is unclear whether the blood vessel punctured by the needle body 14 is an artery or a vein. That is, if the oxygen saturation of the blood in the needle hub 24 is less than the oxygen saturation threshold and the movement speed of the blood surface in the needle hub 24 is equal to or greater than the movement speed threshold, the determination unit 74 determines that it is unclear which blood vessel has been punctured by the needle body 14. Thereafter, the process proceeds to step S32.

[0099] In step S32, the display control unit 76 causes the display unit 82 to display the determination result by the determination unit 74. Thereafter, the determination process ends.

[0100] The surgeon determines whether the blood vessel punctured by the needle body 14 is an artery or a vein based on the patient's vital data, oxygen saturation information, and movement speed information. The surgeon compares the determination result by the determination unit 74 (steps S27, S28, S30, S31) with his or her own determination result, and determines whether the determination result by the determination unit 74 is correct or incorrect. The surgeon inputs the determination result into the determiner 34 using the input unit 80. The machine learning unit 78 performs machine learning using the information on the determination result input by the surgeon as training data.

[0101] If the operator's judgment result is positive, the oxygen saturation threshold and movement speed threshold corresponding to the patient's vital data are not changed. The positive judgment result input by the operator is stored in the determiner 34 as data supporting the reliability of the oxygen saturation threshold and movement speed threshold.

[0102] On the other hand, if the operator's judgment is incorrect, the oxygen saturation threshold and the movement speed threshold corresponding to the patient's vital data are fine-tuned by increasing or decreasing them.

[0103] As a result, the oxygen saturation threshold and the movement speed threshold are optimized, and the accuracy of the determination by the determination unit 74 can be improved. [Explanation of symbols]

[0104] 12...artery and vein identification device 14...needle body 24...Needle hub 26...Hub body 28...Attachment part 30...Measuring device 36...oximeter probe 38...first position sensor 40... Second position sensor 42... First light emitting unit 44...First light receiving section 46...Second light emitting section 48... Second light receiving section 50... Third light emitting section 52...Third light receiving section 60...Moving speed calculation section 66... vital data acquisition unit 70... oxygen saturation acquisition unit 72...Movement speed acquisition section 74...Judgment section 86... Position sensor attachment part 88... Marker

Claims

1. an oxygen saturation acquisition unit that acquires the oxygen saturation of blood in a needle hub that holds the needle body to be inserted into a blood vessel; a movement speed acquisition unit that acquires a movement speed of the blood surface moving within the needle hub; a determination unit that determines whether the blood vessel punctured by the needle body is an artery or a vein based on the oxygen saturation level and the moving speed; An artery and vein identification device comprising:

2. 2. The artery and vein identification device according to claim 1, The determination unit determines whether the blood vessel punctured by the needle is an artery or a vein based on a comparison result between the oxygen saturation level and an oxygen saturation threshold value and a comparison result between the movement speed and a movement speed threshold value.

3. 3. The artery and vein identification device according to claim 2, Further comprising a vital data acquisition unit that acquires vital data of a patient, the determination unit sets the oxygen saturation threshold and the movement speed threshold based on the vital data and a trained model; The trained model is a machine learning model that has been trained by machine learning to output the oxygen saturation threshold and the movement speed threshold in response to input of the vital data.

4. 2. The artery and vein identification device according to claim 1, further comprising a measuring device attachable to the needle hub; the measuring device includes an oximeter probe, a first position sensor, and a second position sensor; the oximeter probe includes a first light-emitting unit that emits light toward the lumen of the needle hub and a first light-receiving unit that receives the light emitted by the first light-emitting unit; the first position sensor includes a second light-emitting unit that emits light toward the lumen of the needle hub and a second light-receiving unit that receives the light emitted by the second light-emitting unit, the second position sensor includes a third light-emitting unit that emits light toward the lumen of the needle hub, and a third light-receiving unit that receives the light emitted by the third light-emitting unit, The first position sensor and the second position sensor are spaced apart from each other in the longitudinal direction of the needle hub.

5. 5. The artery and vein identification device according to claim 4, an oxygen saturation calculation unit that calculates the oxygen saturation based on the amount of light received by the first light receiving unit; a movement speed calculation unit that calculates the movement speed based on a time point when the amount of light received by the second light receiving unit changes by a predetermined amount or more and a time point when the amount of light received by the third light receiving unit changes by a predetermined amount or more; The artery and vein identification device further comprises:

6. 5. The artery and vein identification device according to claim 4, the needle hub has a hub body to which the needle body is fixed and a mounting portion to which the measuring device is mounted, The artery and vein identification device has a light-transmitting property.

7. 5. The artery and vein identification device according to claim 4, the needle hub has a hub body to which the needle body is fixed and a position sensor mounting portion to which the first position sensor and the second position sensor are mounted, The inner diameter of the cavity of the position sensor mounting portion is smaller than the inner diameter of the cavity of the hub body.

8. 5. The artery and vein identification device according to claim 4, the needle hub has a hub body to which the needle body is fixed and a position sensor mounting portion to which the first position sensor and the second position sensor are mounted, The artery and vein identifying device further comprises a marker provided in the lumen of the position sensor mounting portion, the marker moving with the level of the blood moving through the lumen of the position sensor mounting portion.

9. an oxygen saturation acquiring step of acquiring, by an oxygen saturation acquiring unit, the oxygen saturation of blood in a needle hub that holds the needle body to be inserted into a blood vessel; a movement speed acquiring step of acquiring a movement speed of the blood surface moving inside the needle hub by a movement speed acquiring unit; a determining step of determining whether the blood vessel punctured by the needle body is an artery or a vein based on the oxygen saturation level and the moving speed by a determining unit; An artery and vein identification method comprising:

10. A program for causing a computer to execute the artery-vein identifying method according to claim 9.

11. A computer-readable non-transitory recording medium storing the program according to claim 10.

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