JP2024003304A - Medical liquid detection device and tag device - Google Patents

Abstract

The present invention provides a medical liquid detection device with a novel structure that enables more stable detection of liquid leakage. A medical liquid detection device (10) for detecting a medical detection target liquid (6) leaked from a liquid passage circuit (8), which includes an RF tag (18) and an arm (5) of a patient (4) connected to the liquid passage circuit (8). A tag holding means 16 that arranges an RF tag 18 below, a reader/writer device 14 that communicates with the RF tag 18 by radio waves, and a medical device based on changes in the communication state between the RF tag 18 and the reader/writer device 14. It has a detection unit 34 that electrically detects leakage of the liquid 6 to be detected. [Selection diagram] Figure 1

Description

The present invention relates to a medical liquid detection device and a tag device used in the medical field to detect blood leakage, etc.

In the medical field, fluid leakage can sometimes be a problem in treatments that require long-term treatment, and for this reason, it is necessary to detect fluid leaks as early as possible when they occur. In some cases, For example, during dialysis, liquid leakage (liquid leakage), where blood or drug solution leaks from the puncture site, may occur due to the needle being pulled out of the patient, etc., and it is necessary to detect and deal with liquid leakage before it becomes a major problem. There is. However, since it is not realistic for busy medical personnel to continuously monitor dialysis treatment from start to completion, the adoption of liquid detection devices that automatically detect liquid leakage is being considered.

Conventionally, for example, as disclosed in Japanese Unexamined Patent Application Publication No. 2012-196293 (Patent Document 1), a patient's forearm is placed on a sheet having a plurality of detection wirings, and when leaked liquid such as blood comes into contact with the detection wirings, electricity is generated. An electrical resistance type liquid detection device has been proposed, in which liquid leakage is detected based on a change in electrical resistance when the electrical resistance is short-circuited. In addition, a camera-type liquid detection device that optically monitors a detection target using a camera has also been proposed, as disclosed in Japanese Patent Application Laid-open No. 2017-042302 (Patent Document 2).

Japanese Patent Application Publication No. 2012-196293 Japanese Patent Application Publication No. 2017-042302

However, electrical resistance type liquid detection devices such as those disclosed in Patent Document 1 can detect even a small amount of liquid depending on its position and how it spreads, so it may falsely detect liquids that do not need to be detected, such as patient sweating. There was a risk that Furthermore, in the case of a camera-type liquid detection device such as that disclosed in Patent Document 2, it is possible that the liquid to be detected may not be detected, for example, when the puncture site, etc., where liquid leakage is expected to occur during sleep, is covered with a bedding.

An object of the present invention is to provide a medical liquid detection device with a novel structure that enables more stable detection of liquid leakage. Another object of the present invention is to provide a tag device constituting the medical liquid detection device as described above.

Hereinafter, preferred embodiments for understanding the present invention will be described. However, each of the embodiments described below is described by way of example, and may not only be adopted in combination with each other as appropriate, but also be described in each embodiment. The plurality of components can also be recognized and employed as independently as possible, and can also be appropriately employed in combination with any of the components described in other embodiments. Accordingly, the present invention is not limited to the embodiments described below, and various other embodiments can be realized.

A first aspect is a medical liquid detection device that detects a medical detection target liquid leaked from a liquid passage circuit, and includes an RF tag and an RF tag attached below the arm of a patient connected to the liquid passage circuit. A tag holding means for arranging the tag, a reader/writer device that communicates with the RF tag by radio waves, and leakage of the medical detection target liquid based on a change in the communication state between the RF tag and the reader/writer device. and a detection section that electrically detects.

According to the medical liquid detection device having the structure according to the present aspect, it is possible to detect the medical detection target liquid below the arm based on the change in the communication state between the RF tag and the reader/writer device. More stable detection of liquid leakage is possible. In particular, even if a region where the medical detection target liquid needs to be detected is covered and cannot be seen, the presence or absence of the medical detection target liquid can be ascertained.

In a second aspect, in the medical liquid detection device according to the first aspect, the arm part can be placed in a non-fixed manner on the tag holding means in which the RF tag is arranged. It is something.

According to the medical liquid detection device having the structure according to the present aspect, even if the patient changes his or her posture, moves the arm, or changes the circumferential direction of the arm, the RF tag The tag holding means in which is arranged does not move following the arm. As a result, the RF tag and the reader/writer device are kept facing each other, and communication between the RF tag and the reader/writer device is maintained, so that liquid leakage detection is continued.

A third aspect is the medical liquid detection device according to the first or second aspect, wherein the tag holding means includes an absorbent body that absorbs the medical detection target liquid, and the absorbent body absorbs the medical detection target liquid. It is placed close to the RF tag.

According to the medical liquid detection device having the structure according to the present aspect, since the medical detection target liquid is absorbed by the absorber and held near the RF tag, the RF tag and the reader due to the presence of the medical detection target liquid A change in the communication state with the lighter device is efficiently caused, and the medical detection target liquid can be detected more accurately.

A fourth aspect is the medical liquid detection device according to any one of the first to third aspects, further comprising a spacer for setting a distance from the arm to the RF tag. be.

According to the medical liquid detection device having the structure according to the present aspect, since the spacer is arranged between the human body and the RF tag, false detection due to the influence of the human body occurs when the medical detection target liquid is not detected. can be prevented.

In a fifth aspect, in the medical liquid detection device according to any one of the first to fourth aspects, the liquid passage circuit is configured to include a blood circuit, and the medical detection target liquid is It is considered to be blood.

According to the medical liquid detection device structured according to the present embodiment, it is possible to detect blood leakage in a blood circuit including a patient's vascular system and an external circuit such as a dialysis circuit connected to the blood vessel, for example. can.

In a sixth aspect, in the medical liquid detection device according to the fifth aspect, the device is placed below a puncture portion into a blood vessel of a dialysis circuit constituting the blood circuit to prevent passage of the medical detection target liquid. The RF tag is arranged on the lower surface of a flat sheet to be blocked, the reader/writer device is arranged below the RF tag, and the RF tag and the reader/writer device are arranged to face each other in the vertical direction. This is what is being done.

According to the medical liquid detection device having the structure according to the present embodiment, in artificial dialysis that requires puncturing a blood vessel, blood collected on a sheet placed below the punctured portion or absorbed by the absorbent body of the sheet can be detected. By detecting based on changes in the communication state between the RF tag and the reader/writer device, leakage of blood from the puncture site can be detected. In particular, during long-term artificial dialysis, blood leakage can be stably detected even if the punctured part is covered with a bedding or the like and cannot be seen, or even if the punctured part moves slightly.

A seventh aspect is a tag device constituting a medical liquid detection device for detecting a medical detection target liquid leaked from a liquid passage circuit, the tag device including an RF tag and a patient's arm connected to the liquid passage circuit. and a tag holding means for disposing the RF tag below the RF tag.

According to the tag device having the structure according to this aspect, by placing the RF tag below the arm by the tag holding means, the leaked medical detection target liquid is located near the RF tag, and the medical detection target liquid is placed near the RF tag. The liquid can effectively influence the communication state of the RF tag. In addition, in the tag device according to this aspect, for example, the absorbent body according to the third aspect, the spacer according to the fourth aspect, the liquid-impermeable sheet according to the sixth aspect, etc. are combined as appropriate. and can be adopted.

According to the present invention, liquid leakage can be detected more stably in a medical liquid detection device. Further, it is possible to provide a tag device that effectively operates in a medical liquid detection device that exhibits the above-described effects.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of the use of a medical liquid detection device according to a first embodiment of the present invention, and is a diagram illustrating a state in which blood is not detected. A sectional view showing a tag device constituting the liquid detection device of FIG. 1 Block diagram of the liquid detection device shown in Figure 1 FIG. 2 is a diagram illustrating an example of the use of the liquid detection device of FIG. 1, and is a diagram illustrating a state in which blood is detected. A sectional view showing a tag device constituting a medical liquid detection device as another embodiment of the present invention. A sectional view showing a tag device constituting a medical liquid detection device as yet another embodiment of the present invention A sectional view showing a tag device constituting a medical liquid detection device as yet another embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a medical liquid detection device 10 as a first embodiment of the present invention. The liquid detection device 10 detects, for example, leakage of blood 6 as a medical detection target liquid due to needle dislodgement, etc. at the puncture site of the blood collection port 2 and blood return port 3 of the artificial dialysis device 1 on the forearm 5 of the patient 4. to monitor. In the following description, the vertical direction basically refers to the vertical vertical direction when the liquid detection device 10 is in use.

The liquid detection device 10 includes a tag device 12 and a reader/writer device 14. As shown in FIG. 2, the tag device 12 has a structure in which an RF tag 18 is attached to the bottom surface of a sheet 16 serving as a tag holding means.

The sheet 16 has a substantially flat plate shape, and has a laminated structure in which an absorbent body 20, an impermeable film 22, and a cushion body 24 are stacked and fixed to each other. The absorber 20 is capable of absorbing and retaining a medical detection target liquid (blood 6). The material for forming the absorbent body 20 is not particularly limited, but since it will be in contact with the forearm 5 of the patient 4 as described later, it is preferably formed of, for example, laminated nonwoven fabric to provide a good feel and stickiness. Efforts will be made to prevent this.

An impermeable film 22 is superimposed on the underside of the absorbent body 20. The impermeable film 22 is a thin member that prevents blood 6 from passing through, and is made of, for example, polyethylene terephthalate and has flexibility. The sheet 16 has an impermeable film 22 that prevents blood 6 from passing through, and the blood 6 absorbed by the absorber 20 is retained on the impermeable film 22. .

Furthermore, a cushion body 24 is superimposed on the lower side of the impermeable film 22. The cushion body 24 is made of, for example, laminated nonwoven fabric, and in this embodiment is made of the same material as the absorbent body 20.

The sheet 16 has a function as a spacer that sets the distance between the RF tag 18 and the forearm 5. In the sheet 16, the thickness of the absorber 20 is limited by the ability to absorb blood 6, etc., and the thickness of the impermeable film 22 is limited by flexibility, cost, etc. The thickness dimension is mainly adjusted by the cushion body 24, and the separation distance between the RF tag 18 and the forearm 5 is set by adjusting the thickness dimension of the cushion body 24. In other words, the thickness and number of laminated layers of the nonwoven fabric constituting the cushion body 24 are set according to the required separation distance between the RF tag 18 and the forearm 5. However, the absorbent body 20 is placed close to the RF tag 18, and the thickness dimensions of the impermeable film 22 and the cushion body 24 are such that the blood 6 absorbed into the absorbent body 20 reaches the impermeable film 22. In this state, the radio wave communication state of the RF tag 18 is made small enough to cause a change due to the blood 6.

The RF tag 18 is in the form of a thin sheet, and includes a tag-side antenna 26 and a tag-side control chip 28, as shown in FIG. In the RF tag 18, the tag-side control chip 28 performs operations such as controlling the operation of the tag-side antenna 26, processing received signals, and generating transmission signals (response signals). The RF tag 18 is preferably a passive tag that is activated by radio waves from the reader/writer device 14, which will be described later. It may also be a semi-passive tag that is activated.

It is preferable that the RF tag 18 includes a protector (not shown) that protects an inlet consisting of a tag-side antenna 26 and a tag-side control chip 28. The protector covers the surface of the inlet to prevent damage to the tag-side antenna 26 and the tag-side control chip 28 due to direct adhesion of liquid, and is made of, for example, resin.

The RF tag 18 is disposed in a region where the blood 6 reaches when the leaked blood 6 is absorbed and retained by the absorber 20. That is, in this embodiment, the blood 6 flowing from the forearm 5 placed on the sheet 16 flows down into the absorbent body 20 of the sheet 16 and then flows downward within the absorbent body 20 to reach the impermeable film 22. . Since the forearm 5 is placed on the sheet 16 so that the blood collection port 2 and the blood return port 3 from which the blood 6 leaks are located at the center of the sheet 16, the blood 6 flows downward through the center of the sheet 16. It flows easily and is retained in the absorbent body 20 mainly in the central portion. Therefore, in this embodiment, the RF tag 18 is attached to the lower surface of the central portion of the sheet 16.

The reader/writer device 14 is a device that communicates with the RF tag 18 using radio waves, and the reader/writer device 14 and the RF tag 18 constitute an RFID (Radio Frequency Identification). The reader/writer device 14 includes an RW side antenna 32 for transmitting and receiving signals to and from the RF tag 18, and an RW side antenna 32 for controlling the operation of the RW side antenna 32, generating a transmission signal, processing a reception signal (response signal), etc. A side control section 34 is provided. Then, the reader/writer device 14 transmits radio waves of transmission signals toward the RF tag 18 at predetermined time intervals. The reader/writer device 14 is located below the tag device 12 and is preferably located below the tag device 12 in a vertical direction. The reader/writer device 14 may be portable, or may be fixedly installed, for example, in a building, other medical equipment, bed 7, or the like.

The RF tag 18 and the reader/writer device 14 communicate with each other using radio waves in the UHF (Ultra Hi Frequency) band of about 920 MHz. That is, when a UHF band radio wave transmitted from the RW side antenna 32 of the reader/writer device 14 is received by the tag side antenna 26 of the RF tag 18, the tag side control chip 28 of the RF tag 18 uses the received radio wave as a power source. actuates and generates a response signal. The response signal transmitted from the tag side antenna 26 is received by the RW side antenna 32 of the reader/writer device 14. Note that the RF tag 18 may be configured to respond immediately upon receiving a radio wave transmitted from the reader/writer device 14, or may be configured to respond only when a response command signal is received from the reader/writer device 14. good.

The liquid detection device 10 having such a structure detects, for example, leakage of the blood 6 in the blood circuit 8, which is a fluid circulation circuit constituted by the artificial dialysis device 1 and the blood vessels of the patient 4. More specifically, for example, as shown in FIG. 1, the liquid detection device 10 detects leakage of blood 6 at the puncture portion (blood collection port 2 and blood return port 3) of the patient 4 in the artificial dialysis device 1. Used for detection. In FIG. 1, the patient 4 is lying on his back on the bed 7, and the blood collection port 2 and the blood return port 3, which are the ends of the dialysis circuit of the artificial dialysis device 1 on the patient 4 side, are connected to the patient's 4 arm. Punctured in forearm 5. Thereby, the dialysis circuit that constitutes the blood circuit 8 is connected to the forearm 5. Further, a tag device 12 is placed on the upper surface of the bed 7, and the punctured portions of the blood collection port 2 and the blood return port 3 in the forearm 5 of the patient 4 are placed on the tag device 12. The forearm 5 can be placed on the tag device 12 without being fixed, and the RF tag 18 is placed below the forearm 5 by placing the forearm 5 on the tag device 12. The forearm 5 is overlapped in contact with the absorbent body 20 forming the upper part of the sheet 16. On the other hand, the reader/writer device 14 is installed on the floor below the bed 7 and is arranged to face the RF tag 18 of the tag device 12 in the vertical direction.

Then, UHF band radio waves are transmitted from the reader/writer device 14 toward the RF tag 18, and the liquid detection device 10 detects leakage of the blood 6 based on whether or not the RF tag 18 responds to the radio waves. .

That is, when there is no leakage of blood 6 as shown in FIG. A signal is transmitted, and the reader/writer device 14 receives a response signal. When there is a response from the RF tag 18 in this manner, it is detected by the reader/writer device 14 as a detection unit that the medical detection target liquid (blood 6) is not present in the vicinity of the RF tag 18.

On the other hand, if blood 6 leaks from the puncture site as shown in FIG. As a result, the radio waves supplied to the RF tag 18 become weaker. As a result, the response signal from the RF tag 18 weakens or disappears, so the communication state changes from the case where there is no leakage of blood 6. Then, the RW side control unit 34 of the reader/writer device 14 detects the presence of blood 6 near the RF tag 18 based on the change in the communication state that there is no valid response from the RF tag 18.

Note that the detection unit that electrically detects the leakage of blood 6 may be configured by the RW side control unit 34 of the reader/writer device 14 as in the present embodiment; It may also be configured with other devices. For example, when there is no valid response from the RF tag 18, the reader/writer device 14 generates a liquid detection signal and sends the liquid to a processing device (not shown, such as a personal computer) connected to the reader/writer device 14 by wire or wirelessly. A detection signal may be transmitted, and in this case, the processing device that has received the liquid detection signal performs blood 6 detection processing.

As described above, the liquid detection device 10 detects leakage of blood 6 due to unintentional needle dislodgement from the blood collection port 2 and the blood return port 3 based on changes in the communication state between the RF tag 18 and the reader/writer device 14. can be detected. In particular, by detecting blood 6 based on changes in the communication state due to radio waves, blood can be detected even if, for example, blood sampling port 2 and blood return port 3 of forearm 5 are covered with bedding or the like and cannot be seen from the outside. 6 leakage can be detected effectively.

In this embodiment, the RF tag 18 is attached to the lower surface of the seat 16, and the forearm 5 is placed on the seat 16. As a result, even if, for example, the forearm 5 moves horizontally on the seat 16 or is twisted and rotated in the circumferential direction, the seat 16 that is not fixed to the forearm 5 is 5, and the RF tag 18 attached to the sheet 16 is held vertically opposed to the reader/writer device 14. Therefore, even if the patient 4 moves the forearm 5 on the seat 16, the communication state between the RF tag 18 and the reader/writer device 14 is hardly affected, and effective detection of blood 6 leakage can be maintained.

In this embodiment, since the impermeable film 22 that prevents the blood 6 from passing is disposed below the absorbent body 20, the blood 6 passing through the absorbent body 20 does not reach the bed 7, and the impermeable film 22 prevents the blood 6 from reaching the bed 7. It is designed to stay above 22. Thereby, the blood 6 can be maintained in a state where it is absorbed by the absorber 20, and the bed 7 can be prevented from becoming dirty due to the blood 6 adhering.

Further, a cushion body 24 is arranged between the impermeable film 22 and the RF tag 18, and a spacer for adjusting the distance between the forearm 5 and the RF tag 18 is arranged between the impermeable film 22 and the cushion body 24. It is composed of: By providing such a spacer, the radio waves transmitted from the reader/writer device 14 can be prevented from being excessively absorbed by the forearm 5, and the RF tag 18 can be radio waves can be effectively supplied to

Note that the absorbent body 20 that has not absorbed the blood 6 also serves as a spacer that separates the forearm 5 and the RF tag 18. However, if the absorbent body 20 is too thick, if the blood 6 leaks, more of the blood 6 will be absorbed by the absorbent body 20 on the way to the impermeable film 22, resulting in a detectable amount of blood 6 being absorbed. More bleeding is required before the blood 6 reaches the vicinity of the impermeable film 22 near the RF tag 18. Furthermore, if the impermeable film 22 is made thick, there are problems such as loss of flexibility of the sheet 16. Therefore, in the present embodiment, by providing the cushion body 24 between the impermeable film 22 and the RF tag 18, the flexibility of the sheet 16 on which the forearm 5 is placed is ensured, and the blood 6 is removed at an appropriate amount. It is believed that it is possible to detect with high accuracy.

The tag device 12 of the liquid detection device 10 can be used frequently by performing treatments such as cleaning and sterilization after use, but it is preferably used once. Thereby, the tag device 12 equipped with the absorbent body 20 that comes into contact with the patient 4 can be kept clean, and infection among the patients 4 can be prevented.

In the liquid detection device 10 of the present embodiment, when leakage of the blood 6 is detected, the detection of the blood 6 is notified to the outside by the notification device 36. The notification device 36 includes, for example, a light 38 and a speaker 40, and controls whether the light 38 emits light and the speaker 40 emits sound, the manner of the light emission and sound generation (for example, the light emission and sound pattern, the color of the light emitted, the pitch), etc. is controlled by the RW side control section 34. Furthermore, by emitting light or emitting sound from a light 38 or a speaker 40 located at a distance from the tag device 12 and the reader/writer device 14 via wireless communication such as Bluetooth (registered trademark), it is also possible to notify doctors, family members, etc. . For example, in addition to existing notification devices such as a light 38, a speaker 40, and a smartphone installed in a nurse's waiting room, the notification device 36 can also be installed near the entrance of a hospital room to notify the outside of an abnormality. You may let them know.

In the liquid detection device 10 of this embodiment illustrated in FIG. 1, the reader/writer device 14 and the notification device 36 are separated from each other, and the reader/writer device 14 and the notification device 36 are connected to each other by wire or wirelessly. The notification device 36 is set at a lower position in the artificial dialysis apparatus 1 so that the light emission is easily visible and the operation to stop the light emission and sound generation is easy.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description. For example, the RF tag 18 can be held in a superimposed state on the forearm 5 by wrapping and fixing a sheet-like (band-like) tag holding means to which the RF tag 18 is attached around the forearm 5 of the patient 4. . In this case, for example, a plurality of RF tags 18 are arranged with respect to the tag holding means so as to be spaced apart from each other in the circumferential direction of the forearm 5, and any one of the RF tags 18 is positioned below the forearm 5. In this way, a state in which liquid leakage can be detected can be maintained.

Although the liquid detection device 10 including one RF tag 18 and one reader/writer device 14 has been illustrated, for example, based on a change in the communication state between a plurality of RF tags 18 and one reader/writer device 14, It is also possible to detect the medical detection target liquid at multiple locations. In this case, the reader/writer device 14 can identify the RF tags 18 by writing codes that allow mutual identification into the plurality of RF tags 18 .

In the embodiment described above, the RF tag 18 whose inlet is covered with a protector and has resistance to contact with the liquid to be detected medically is exemplified. Good too. According to this, when a medical detection target liquid leaks, the RF tag that comes into contact with the medical detection target liquid decomposes, and the response function of the RF tag is more reliably stopped, allowing accurate detection of liquid leaks. can do. Note that in this case, the absorber 20 is not essential, and the leaked medical detection target liquid may come into contact with the RF tag without being collected and held by the absorber 20.

In the embodiment described above, an example was shown in which leakage of blood 6 is detected when there is no response from the RF tag 18. Depending on the distance, etc., there may be a case where there is a response from the RF tag 18 even if the blood 6 is leaking. Therefore, leakage of blood 6 is not necessarily detected by the disappearance of the response from the RF tag 18, but can be detected by, for example, the intensity of the response signal from the RF tag 18 falling below a preset threshold. It is also possible to do so. In short, leakage of the medical detection target liquid can be detected based on a change in the communication state between the reader/writer device 14 and the RF tag 18, and this change in communication state requires only a complete interruption of communication. It also includes changes that occur while communication is being maintained, such as a decrease in communication signal strength or an increase in noise.

The structure of the sheet 16 is not limited to the three-layer structure shown in the above embodiment. For example, as in the tag devices 50, 60, and 70 shown in FIGS. 5 to 7, a sheet 52 as a tag holding means is composed of only an absorbent body 20 and an impermeable film 22, and the cushion body (24) is omitted. can also be adopted. In the tag device 50 of FIG. 5, the RF tag 18 is fixed to the upper surface of the impermeable film 22, and the RF tag 18 is placed in direct contact with the absorber 20. In the tag device 60 of FIG. 6, the RF tag 18 is embedded in the impermeable film 22, and the RF tag 18 may be exposed from the impermeable film 22 and directly contact the absorber 20. , and may be covered with an impermeable film 22. In the tag device 70 of FIG. 7, the RF tag 18 is fixed to the lower surface of an impermeable film 22, and the impermeable film 22 is interposed between the RF tag 18 and the absorber 20. In any of the embodiments shown in FIGS. 5 to 7, the RF tag 18 and the absorbent body 20 are arranged close to each other, and the cushion body (24) is not interposed between the RF tag 18 and the absorbent body 20. . In particular, in the tag devices 50 and 60 of FIGS. 5 and 6, the RF tag 18 can be placed adjacent to and in contact with the absorber 20. According to the tag devices 50, 60, and 70 of FIGS. 5 to 7 that do not have such a cushion body (24), the medical detection target liquid (blood 6) absorbed by the absorber 20 is located closer to the RF tag 18. As a result, the medical detection target liquid becomes more susceptible to communication between the RF tag 18 and the reader/writer device 14, and the accuracy of detecting liquid leakage can be improved. In addition, in the tag devices 50 and 60 of FIGS. 5 and 6, the spacer that sets the distance from the arm (forearm 5) to the RF tag 18 is constituted by the absorber 20 that does not absorb the liquid to be detected medically. The tag device 70 of No. 7 is composed of an absorber 20 that does not absorb the medical detection target liquid and an impermeable film 22.

In the embodiment described above, the spacer that adjusts the distance between the forearm 5 and the RF tag 18 is constituted by the sheet 16. It is also possible to eliminate the impermeable film 22 or to place it below the RF tag 18 (on the opposite side from the forearm 5). In addition, in order to reduce the deterioration in detection accuracy due to the presence of a human body (forearm 5) with a high water content, a structure is provided between the human body (forearm 5) and the absorbent body 20 that has lower liquid retention than the absorbent body 20 and is transparent. By arranging, for example, a hydrophilic porous material having continuous pores as a highly liquid spacer, a large separation distance between the leaking part retained by the absorber 20 and the human body (forearm 5) is ensured. You can do it like this. Furthermore, since the cushion body 24 between the impermeable film 22 and the RF tag 18 is not required to have liquid retention properties, the material can be arbitrary. Appropriate thickness and characteristics can be set so that the two can be stably maintained at a separation distance that is advantageous for detection.

In the above embodiment, the sheet 16 having flexibility is illustrated, but for example, by disposing a flat impermeable plate in place of the flexible impermeable film 22, the sheet 16 can be kept in a flat shape. It can also be made into a sheet. According to such a flat sheet, movement of the RF tag 18 due to deformation of the sheet is prevented, so that the RF tag 18 is stably held in a state facing the reader/writer device 14. Note that some deformation may be allowed even in a flat sheet. For example, if the movement of the RF tag 18 due to the deformation of the sheet does not hinder communication with the reader/writer device 14, the deformation of the sheet may be allowed. may be allowed.

Furthermore, a plurality of RF tags 18 may be attached to one sheet 16, thereby expanding the area in which liquid can be detected on the sheet 16, and considering relative comparisons of detection results from the plurality of RF tags. It is also possible to improve the detection accuracy by increasing the detection output value by adding or adding them, or to use another RF tag for support when a problem occurs with the RF tag. .

In the embodiment described above, the case of detecting the leakage of blood 6 during artificial dialysis has been exemplified, but for example, in the case of infusion, when the needle of the infusion circuit comes off from the forearm 5 of the patient 4, etc., and the drug solution etc. leaks. , chemical liquid, etc. can also be detected as a medical detection target liquid. Preferably, the liquid to be medically detected is a bodily fluid existing in the human body, or a liquid such as a medicinal solution or a blood transfusion supplied to the human body from the outside.

10 Medical liquid detection device (first embodiment)
12 Tag device 14 Reader/writer device 16 Sheet (tag holding means, spacer)
18 RF tag 20 Absorber 22 Impermeable film 24 Cushion body 26 Tag side antenna 28 Tag side control chip 32 RW side antenna 34 RW side control section (detection section)
36 Notification device 38 Light 40 Speaker 50 Tag device (another embodiment)
52 Sheet (tag holding means)
60 Tag device (alternative embodiment)
70 Tag device (alternative embodiment)
1 Artificial dialysis machine 2 Blood collection port 3 Blood return port 4 Patient 5 Forearm (arm)
6 Blood (liquid subject to medical detection)
7 Bed 8 Blood circuit (fluid circuit)

Claims (7)

A medical liquid detection device that detects a medical detection liquid leaking from a liquid circulation circuit,
RF tag and
tag holding means for arranging the RF tag below the patient's arm connected to the fluid circuit;
a reader/writer device that communicates with the RF tag using radio waves;
A medical liquid detection device comprising: a detection unit that electrically detects leakage of the medical detection target liquid based on a change in a communication state between the RF tag and the reader/writer device. The medical liquid detection device according to claim 1, wherein the arm portion can be placed in a non-fixed manner on the tag holding means on which the RF tag is arranged. 3. The medical liquid detection device according to claim 1, wherein the tag holding means includes an absorber for absorbing the medical detection target liquid, and the absorber is arranged close to the RF tag. The medical liquid detection device according to claim 1 or 2, further comprising a spacer for setting a distance from the arm to the RF tag. 3. The medical liquid detection device according to claim 1, wherein the liquid passage circuit includes a blood circuit, and the liquid to be detected medically is blood. The RF tag is disposed on the lower surface of a flat sheet that is placed below the puncture portion of the blood vessel of the dialysis circuit constituting the blood circuit and prevents the passage of the medical detection target liquid. 6. The medical liquid detection device according to claim 5, wherein the reader/writer device is arranged below, and the RF tag and the reader/writer device are arranged to face each other in the vertical direction. A tag device constituting a medical liquid detection device for detecting a medical detection liquid leaked from a liquid passage circuit, the tag device comprising:
RF tag and
and a tag holding means for arranging the RF tag below the patient's arm connected to the fluid passage circuit.

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