JP4830129B2 - Urination detection system using IC tag - Google Patents

Description

  The present invention relates to a urination detection system using a UHF (ultra-high frequency) band IC tag or an HF (short wave) band IC tag.

  2. Description of the Related Art Conventionally, a urination detection system using a non-contact type tag, label, or the like as a urine sensor has been operated in medical facilities, nursing facilities, elderly care facilities, and the like (see Patent Document 1).

  This urine detection system includes a disposable resonant tag or the like that is attached to the inner surface of a diaper or the like to become a urine sensor, a reader that communicates with the tag via an antenna module or the like disposed in the vicinity of the tag, and the reader When the urination is detected or abnormal, the position and state of the patient and the cared person are communicated from the control means to the medical personnel through the communication means such as a communication line. It is now notified (reported) to caregivers.

  In such a conventional urination detection system, detection of urine using a tag as a probe is performed according to the following principle. That is, in the case of a urination detection system using the resonance tag as a urine sensor, the resonance wavelength of the antenna changes due to urine or electrolyte entering between the winding antennas of the resonance tag. Yes. This makes it difficult to detect (read) a tag by a reader that scans by transmitting radio waves of a predetermined wavelength. Then, when the signal level of the resonance tag changes from detectable to undetectable (below a certain threshold), it is captured as the timing of urination, and a predetermined notification format (transmission of optical signal or audio signal or Signals such as cautions and warnings are sent according to notifications to the host server).

JP 2004-139545 A

  However, a urination detection system using the above-described resonance tag or the like as a urine sensor has a problem that there are many malfunctions (false reports). This malfunction is because urination is not occurring, but a signal that detects urination is emitted, and the cause is that the resonance tag used as a urine sensor is sensitive to moisture. This is probably because of this.

  In other words, the resonance tag has a steep and narrow optimum band (band peak) of the resonance wavelength. Therefore, if the resonance tag is placed in close contact with the periphery of the human body as a urine sensor, individual differences in physique, moisture in the skin (other than urine) The resonance wavelength easily shifts due to or sweating. Therefore, the conventional urination detection system that detects a change in the signal returned from the resonance tag may misunderstand that urination has occurred, and there is a demand for improvement.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a highly reliable urination detection system with few malfunctions by using a UHF band IC tag or an HF band IC tag as a urine sensor. .

To achieve the above object, the present invention is Ri UHF band IC tag Tona described below (a), a urine sensor that will be placed inside the diaper, radio wave having a predetermined wavelength corresponding to the UHF band IC tag A reader that communicates with the urine sensor at a position away from the antenna module via an antenna module that transmits and receives the signal, a recording unit that records signal information of the urine sensor read by the reader, and urine detection Between the reader and the urine during the transmission of the radio wave at a predetermined time interval by the timer circuit. communication between the sensors, the resonance waves of the urine sensor with non-conduction of the loop portion for impedance matching of the antenna circuit due to the absence of urine around the urine sensor Communicable state but to match the incommunicable state does not match the communication wavelength leader, the resonance wavelength of the urine sensor with the communication wavelength leader by the conduction of the loop portion Urine adhering to the cutout portion of the urine sensor The first gist is a urine detection system including control means for transmitting a predetermined urine detection signal to the outside through the notification means when the change is made.
(A) an antenna circuit of an IC chip and for the UHF band, a part of the antenna circuit is provided with a loop portion for impedance matching, a portion of the loop portion for the impedance matching, this loop part notches electrically disconnected is formed, and by the conduction and non-conduction of the cutout portion, UHF band IC tag resonant wavelength you shift of the antenna circuit.

Further, the present invention is an antenna Ri UHF band IC tag Tona described below (b), and urine sensor that will be placed inside the diaper, for transmission and receiving radio waves of a predetermined wavelength corresponding to the UHF band IC tag A reader that communicates with the urine sensor located away from the antenna module via a module, a recording means that records signal information of the urine sensor read by the reader, and urine detection is transmitted to the outside. Notification means, a timer circuit for transmitting the radio wave from the reader at a predetermined time interval, and communication between the reader and the urine sensor during transmission of the radio wave at a predetermined time interval by the timer circuit. Shin, the communication wavelength of the resonant wavelength leader of the urine sensor with non-conduction of the second loop portion for impedance mismatch due to the absence of urine around the urine sensor- From to have the communication enabled state, when the resonance wavelength of the urine sensor has changed to a communication disabled state does not match the communication wavelength leader by the conduction of the second loop portion by the urine adhering to the cut-out of the urine sensor The second gist is a urine detection system including control means for transmitting a predetermined urine detection signal to the outside via the notification means.
(B) an antenna circuit of an IC chip and for the UHF band, a part of the antenna circuit, a first loop portion for impedance matching, and a second loop portion for impedance mismatch provided , a portion of the second loop portion for the impedance mismatch, notches for electrically disconnected the second loop portion of this is formed by conductive or non-conduction of the cutout portion, the antenna UHF band IC tag resonance wavelength of the circuit you shift.

Furthermore, in order to achieve the above object, the present invention is Ri HF band IC tag Tona described below (c), a urine sensor that will be placed inside the diaper, the predetermined wavelength corresponding to the HF band IC tag A reader that communicates with the urine sensor at a position away from the antenna module via an antenna module that transmits and receives radio waves; a recording means that records signal information of the urine sensor read by the reader; Notification means for transmitting detection to the outside, a timer circuit for transmitting the radio wave from the reader at a predetermined time interval, and the reader between the transmission of the radio wave at a predetermined time interval by the timer circuit the communication between the urine sensor, resonance of the urine sensor with non-conduction of the loop portion for impedance matching of the antenna circuit due to the absence of urine around the urine sensor From incommunicable state length does not match the communication wavelength leader, can communicate the resonant wavelength of the urine sensor by conduction of the loop portion Urine adhering to the cutout portion of the urine sensor matches the communication wavelength leader A third aspect of the invention is a urine detection system including a control unit that transmits a predetermined urine detection signal to the outside through the notification unit when the state changes.
(C) an antenna circuit for IC chip and the HF band, a part of the antenna circuit, a loop portion for impedance matching is provided in a portion of the loop portion for the impedance matching, this loop part notches electrically disconnected is formed, and by the conduction and non-conduction of the cutout portion, HF band IC tag resonant wavelength you shift of the antenna circuit.

The present invention is an antenna Ri HF band IC tag Tona described below (d), a urine sensor that will be placed inside the diaper, for transmission and receiving radio waves of a predetermined wavelength corresponding to the HF band IC tag A reader that communicates with the urine sensor located away from the antenna module via a module, a recording means that records signal information of the urine sensor read by the reader, and urine detection is transmitted to the outside. Between the reader and the urine sensor during the transmission of the radio wave at a predetermined time interval by the timer circuit, and a timer circuit for transmitting the radio wave from the reader at a predetermined time interval. communication is a communication wavelength of the resonant wavelength leader of the urine sensor with non-conduction of the second loop portion for impedance mismatch due to the absence of urine around the urine sensor- From to have the communication enabled state, when the resonance wavelength of the urine sensor has changed to a communication disabled state does not match the communication wavelength leader by the conduction of the second loop portion by the urine adhering to the cut-out of the urine sensor Furthermore, a fourth aspect of the present invention is a urine detection system including control means for transmitting a predetermined urine detection signal to the outside via the notification means.
(D) an antenna circuit for IC chip and the HF band, a part of the antenna circuit, a first loop portion for impedance matching, and a second loop portion for impedance mismatch provided , a portion of the second loop portion for the impedance mismatch, notches for electrically disconnected the second loop portion of this is formed by conductive or non-conduction of the cutout portion, the antenna HF band IC tag resonance wavelength of the circuit you shift.

  That is, the inventors of the present invention, as a urine sensor of a urination detection system, replaces a conventional resonance tag sensitive to moisture and the like with a UHF (band peak) having a relatively broad and wide optimum band (band peak). Ultra-high frequency: IC tag (UHF band IC tag) that communicates using a band of wavelengths 1 m to 10 cm, frequency 300 MHz to 3 GHz, and HF (short wave: wavelengths 100 m to 10 m, frequency 3 to 30 MHz) We focused on IC tags (HF band IC tags). However, these UHF band IC tags and HF band IC tags are not easily affected by moisture or sweating of the skin even if they are placed around the human body, but they do not shift the resonance wavelength even if urine or electrolytes adhere to them. If it is sufficient and used as it is, the detection of urination may be uncertain. Accordingly, the present inventors have conducted extensive research to improve the detection accuracy of these IC tags as urine sensors, and as a result, impedance matching portions (inductance circuits) of antenna circuits of UHF band and HF band IC tags. In addition, by providing a notch serving as a urine sensor part, a tag in which the resonance wavelength (bandwidth) fluctuates greatly depending on urine, electrolyte, or the like was successfully produced. And, by using this improved UHF band IC tag or HF band IC tag for urine sensors, a urination detection system that can detect only urine, electrolytes, etc. without reacting to moisture other than urine is established. We have found out that we can do it and have reached the present invention.

Thus, urination detection system of the first urination sensing system and the third aspect of the gist of the present invention, as the urine sensor in the diaper, a portion of the loop portion of the impedance matching of the antenna circuit, the loop portion The UHF band IC tag or the HF band IC tag in which a notch portion (urine sensor portion) that electrically cuts off is formed is used. A urine sensor comprising these IC tags; a reader communicating with the urine sensor; a recording means for recording signal information of the urine sensor; and a timer circuit for transmitting the radio waves from the reader at predetermined time intervals. And between the reader and the urine sensor during the transmission of radio waves at a predetermined time interval by the timer circuit (between the previous transmission and the current transmission) based on the signal information recorded in the recording means. When the communication status of the communication device changes from communication disabled to communication enabled, it is determined that the change in the status is urine detection, and a predetermined detection signal is transmitted to the outside via the notification means. Means. According to the above urination detection system, these IC tags for urine sensor are not completed (conducted) when the urine or electrolyte is not sufficiently present in the surroundings, and the impedance matching loop portion is not completed. The urine sensor cannot communicate with the reader because it does not match the communication wavelength. Then, only when the urine, electrolyte, etc. enter the notch and are short-circuited and the impedance matching loop is in a conductive state, the resonance wavelength matches the communication wavelength of the reader, and the urine sensor is connected to the reader. Can communicate. As a result, the urination detection system according to the first and third aspects of the present invention determines whether or not urine or electrolytes exist around the tag, that is, whether urination has occurred or not. It can be clearly identified by whether or not communication with the reader is possible. In addition, these urination detection systems can detect only urine without any malfunction due to moisture or sweating of the skin even if the urine sensor is placed in close contact with the human body. Thereby, while being able to reduce the burden of a medical staff, a caregiver, etc., wastes, such as changing the diaper which has not been urinated, can also be omitted.

In the urination detection system according to the second aspect of the present invention and the urination detection system according to the fourth aspect, as a urine sensor in the diaper, a part of the antenna circuit includes a first loop part for impedance matching, and a loop Jo impedance mismatches and the second loop portion for is provided, in a part of the second loop portion for the impedance mismatch, notches (urine electrically disconnected loop portion of the second UHF band IC tag or HF band IC tag formed with a sensor part) is used. A urine sensor comprising these IC tags; a reader communicating with the urine sensor; a recording means for recording signal information of the urine sensor; and a timer circuit for transmitting the radio waves from the reader at predetermined time intervals. And between the reader and the urine sensor during the transmission of radio waves at a predetermined time interval by the timer circuit (between the previous transmission and the current transmission) based on the signal information recorded in the recording means. When the communication state of the communication device changes from communicable to incommunicable, the change in the state is determined as urine detection, and a predetermined detection signal is transmitted to the outside via the notification means. Means. According to the urination detection system, in contrast to the urination detection systems of the first and third aspects, the second loop portion for impedance mismatching is provided at the time of drying when urine, electrolyte, etc. are not sufficiently present in the surroundings. The urine sensor can communicate with the reader because it does not complete (conduct) and its resonant wavelength matches the communication wavelength of the reader. Then, only when the urine, the electrolyte, etc. enter the notch and are short-circuited and the second loop part for impedance mismatching is completed (conducted), the resonance wavelength is higher than the communication wavelength with the reader. Shifting significantly, the urine sensor cannot communicate with the reader. As a result, the urination detection system according to the second and fourth aspects of the present invention also determines whether or not urine or electrolytes exist around the tag, that is, whether urination has occurred or not. It can be clearly identified depending on whether communication with the reader is possible or not. Also, these urination detection systems can reliably detect only urine without any malfunction due to moisture or sweating of the skin even if the urine sensor is disposed in close contact with the human body. Thereby, while being able to reduce the burden of a medical staff, a caregiver, etc., the point that wastes, such as changing the diaper which has not been urinated, can also be omitted.

  When the control means or the notification means adds the signal information of the urine sensor recorded in the recording means to the urine detection signal and transmits the signal, the individual patient or cared person It becomes possible to respond quickly to such as. In addition, it is possible to grasp the number of urinations and patterns of individual patients and cared persons, etc., and it is possible to select the transmission destination and contact method of the detection signal according to the signal information. It is preferable because reliable information transmission through a PHS, a mobile phone, a portable information terminal, or the like can be made to a predetermined contact address.

It is explanatory drawing which shows schematic structure (system image) of the urination detection system in embodiment of this invention. It is explanatory drawing which shows the state which attached the urine sensor in the urination detection system of embodiment to the diaper. It is explanatory drawing which shows the example which attached the antenna module and reader | leader of the urination detection system of embodiment to the bed. It is explanatory drawing which shows the example which attached the antenna module and reader of the urination detection system of embodiment to the wheelchair. (A) is a top view which shows typically the pattern of the antenna circuit of the UHF band IC tag for urine sensors used with the urination detection system of the 1st Embodiment of this invention, (b) is this invention. It is a top view which shows typically the pattern of the antenna circuit of the UHF band IC tag for urine sensors used with the urination detection system of 2nd Embodiment of this. (A) is a top view which shows the modification of the pattern of the antenna circuit of the UHF band IC tag for urine sensors used with the urination detection system of 1st Embodiment, (b) is 2nd Embodiment. It is a top view which shows the modification of the antenna circuit pattern of the UHF band IC tag for urine sensors used with a urination detection system, (c) shows the reference example (conventional example) of the antenna circuit pattern of a UHF band IC tag. It is a top view. (A) is a top view which shows the pattern of the antenna circuit of the HF band IC tag for urine sensors used with the urination detection system of the 3rd Embodiment of this invention, (b) is the state which masked other than the sensor part FIG. (A) is a top view which shows the pattern of the antenna circuit of the HF band IC tag for urine sensors used with the urination detection system of the 4th Embodiment of this invention, (b) is the state which masked other than the sensor site | part FIG. It is a graph which shows the frequency characteristic of the UHF band IC tag for urine sensors in the Example of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  The urination detection system according to the embodiment of the present invention is assumed to be used in a medical facility, a nursing facility, etc., and the urine sensor UHF band IC tag 1 [FIG. 5A] or the urine sensor UHF. The band IC tag 2 [FIG. 5 (b)] or the HF sensor IC tags 7 and 8 (see FIGS. 7 and 8) for the urine sensor are placed at a predetermined position of the diaper 5 as the urine sensor 10 as shown in FIG. The diaper 5 is pasted and worn by a patient or a care recipient in the facility. In the facility, as shown in FIG. 1, a plurality of sets of antenna modules 11 and readers 12 for communicating with the urine sensor 10 are disposed at necessary locations such as a hospital room and a living room, and are managed. A control unit 13 (including a recording unit and a notification unit) including a computer that integrates and controls the plurality of readers 12 is disposed in a nurse center on the side of the side. And when the communication state between the reader 12 and the urine sensor 10 changes from incommunicable to communicable, or changes from communicable to incommunicable, a predetermined urine detection signal is It is transmitted from the control means 13 to the outside. This is a feature of the urination detection system of the present invention.

  First, an outline and overall configuration of a urine detection system using a urine sensor composed of these UHF band IC tags or HF band IC tags will be described.

  As described above, the urination detection system according to the embodiment of the present invention includes an antenna module 11 and readers 12 arranged at a plurality of locations in a facility, and computers arranged at a nurse center as shown in FIG. And the like. These devices are connected to each other via a wired LAN (solid line) or a wireless LAN (one-dot chain line), and a network in which signals (information) can be exchanged with each other is formed.

  The control means 13 has both a function (recording means) for recording signal information of the urine sensor 10 and a function (notification means) for transmitting detection of urine to the outside. Moreover, the symbol R in the figure is a router (wireless LAN router), the symbol C is a coordinator (edge router), and the symbol S is according to the content (information) of the urine detection signal transmitted to the outside. A server (SIP server or the like) having a function of appropriately selecting the delivery destination and delivery contents (voice information, character information, etc.), and a symbol M indicates a portable information terminal such as a PHS or a mobile phone.

  In such a urine detection system, each reader 12 captures a change in the communication state of the urine sensor 10 (from communication disabled to communication enabled or from communication enabled to communication disabled). A radio wave having a predetermined wavelength corresponding to (band) is transmitted at predetermined time intervals, and a timer circuit used for the radio wave is provided.

  The control means 13 is configured to send a predetermined urine detection signal to the outside when the communication state between the reader 12 and the urine sensor 10 changes. The signal information of the urine sensor 10 (the position and number of times, ID information for identifying the person wearing the person, etc.) recorded in the computer or the like of the control means 13 is added to the detection signal and transmitted. ing.

  The antenna module 11 and the reader 12 will be described in more detail. For example, when trying to detect urination of a patient or a cared person who cannot move on a bed, as shown in FIG. A thin antenna module 11 having a relatively wide mat shape or sheet shape is placed on a mattress or the like. A urine sensor 10 attached to a diaper 5 worn by a patient lying on the bed, a cared person, or the like by installing a reader 12 in the vicinity of the reader 12 and connecting them by wiring or the like (see FIG. 2). ) Signal can be detected.

  As described above, when receiving a signal from the urine sensor 10 on a fixed object such as a bed, it is not necessary to always specify the position of the urine sensor 10 before urination. Is a UHF band IC tag 1 having an antenna circuit (pattern A) as shown in FIG. 5A, which returns a signal only when urine is detected, or an antenna circuit (pattern as shown in FIG. 7A). The HF band IC tag 7 having C) is preferably used. When communication with the reader 12 becomes possible (when urine is detected), ID information (RFID information) written in advance on the IC chip is transmitted from the IC tags 1 and 7 to the reader 12. The room number, the bed (patient) number, etc. in which the urine sensor 10 is used can be specified only by specifying the installation location of the router R connected to the reader 12 that has received the signal. Of course, in such a case, the UHF band IC tag 2 or the HF band IC tag 8 that returns a signal when urine is not detected may be used.

  Further, for example, when detecting urination of a patient who is moving in a wheelchair or a cared person, as shown in FIG. The reader 12 is installed in the vicinity thereof, and these are connected by wiring or the like. If necessary, the antenna module 11 can be installed or built under the seat surface of the wheelchair (back side) or the backrest.

  In addition, when trying to receive the signal of the urine sensor 10 attached to the diaper 5 worn by a patient or a cared person who can move independently as described above, the position of the urine sensor 10 even before urination is received. It is preferable to always be able to specify. Therefore, the urine sensor 10 returns a signal when urine is not detected, and has a UHF band IC tag 2 having an antenna circuit (pattern B) as shown in FIG. 5B described later, or FIG. An HF band IC tag 8 having an antenna circuit (pattern D) as shown in FIG. Since the ID information written in advance on the IC chips of the IC tags 2 and 8 is transmitted to the reader 12 at predetermined time intervals, only the installation location of the router R connected to the reader 12 that has received this signal is specified. Thus, it is possible to specify the area where the urine sensor 10 is located. Of course, the UHF band IC tag 1 (FIG. 5 (a)) or the HF band IC tag 7 (FIG. 7 (a)) which returns a signal only at the time of urine detection can also be used. In that case, the area where urination occurred and the subsequent action can be grasped.

  Thus, since the urine detection system of this embodiment uses the UHF band IC tags 1 and 2 or the HF band IC tags 7 and 8 for the urine sensor 10, the urine sensor 10 is closely attached to the human body. Even if it is placed, there is no malfunction due to moisture or sweating of the skin, and only urination can be reliably detected. This reliable urination information can reduce the burden on medical personnel and caregivers who manage facilities and the like, and can also eliminate waste such as replacing diapers that have not been urinated.

  Moreover, since this urination detection system can acquire urination information in real time, it becomes possible to respond quickly according to the states of individual patients, care recipients, and the like. In addition, the number of urinations and patterns of individual patients and care recipients can be easily grasped, and PHS, mobile phones and personal digital assistants can be contacted in advance according to the information. Detailed information can be transmitted through such means.

  Next, a urine sensor worn by a patient, a cared person, or the like will be described in detail with reference to the antenna pattern diagram in each embodiment.

  First, in the urination detection system according to the first embodiment of the present invention, a UHF band IC having an antenna circuit (pattern A) as shown in FIG. 5A is used as the urine sensor UHF band IC tag attached to the diaper 5. A tag 1 or a UHF band IC tag 2 having an antenna circuit (pattern B) as shown in FIG. 5B is used.

The UHF band IC tag 1 having the antenna circuit (pattern A) will be described in detail. The antenna circuit A (FIG. 5A) of the UHF band IC tag 1 is formed on the surface of the film-like or sheet-like substrate 3. For example, by using a printing method such as flexographic printing or screen printing, a conductive paste (conductive ink) is applied to a predetermined pattern, or a method of attaching a die-cut metal foil, vapor deposition, etching, etc. It is formed using. The antenna circuit A is composed of two antenna portions 1a for transmitting and receiving radio waves of a predetermined wavelength, and 1a, and a loop portion 1b for impedance matching, a bridge portion 1c for connecting them, said loop portion 1b Are formed with an IC chip connecting portion 1d for mounting the IC chip 4 (two-dot chain line) and a notch portion 1e for electrically disconnecting the impedance matching structure of the loop portion 1b.

  The notch 1e is formed in a straight line parallel to each other, the pattern width (line width) of the parallel (opposite) portions is usually 0.1 mm or more, and the extension in the longitudinal direction of the opposite portions is usually 0.00. It is 1 mm or more. Between these, a groove (a portion having no antenna pattern) having a width of 0.1 mm or more is formed.

In the antenna circuit A having the above pattern, the IC chip 4 is mounted on the IC chip connecting portion 1d, and the cut-out portion of the IC chip 4, the antenna portion 1a, the bridge portion 1c, and the loop portion 1b is provided. The region excluding 1e and the vicinity thereof is sealed with a resin sheet, waterproof paper, or the like, and the urine sensor UHF band IC tag 1 (urine sensor 10) is manufactured.

  Since the UHF band IC tag 1 for urine sensor is in close contact with the skin of a patient or a cared person, when used as the urine sensor 10, it is made of a hygroscopic material such as nonwoven fabric or paper. A bag (packaging) or a cover is placed (see FIG. 2). The bag or the upper paper made of the hygroscopic material also has an effect of guiding moisture such as urine and electrolyte to the unsealed notch 1e. Further, on the back side of the bag made of the hygroscopic material (the side of the base material 3 where the UHF band IC tag 1 is not formed), an adhesive or both sides for fixing the position of the urine sensor 10 is used. Tape etc. are arranged.

When such a UHF band IC tag 1 is used as the urine sensor 10, as described above, the loop portion 1b is electrically disconnected from a part of the impedance matching loop portion 1b of the antenna circuit A. Since the cutout portion 1e is formed, the impedance matching circuit (loop portion 1b ) is not completed at the time of drying when urine or electrolyte is not present in the surroundings, and the resonance wavelength of the antenna (having a certain width) Band) is significantly shifted from the wavelength (predetermined) of the radio wave transmitted from the reader 12 or the like. Therefore, in this state, the urine sensor UHF band IC tag 1 cannot communicate with the reader 12 or the like.

Only when the urine, electrolyte, etc. enter the groove formed in the notch 1e and this part is short-circuited to complete the impedance matching circuit (loop part 1b ), the resonance wavelength of this antenna ( Band) is greatly shifted to a range in which radio waves of a specific wavelength transmitted from the reader 12 and the like can be communicated, and communication with the reader 12 and the like becomes possible. It has been confirmed that such a significant shift in the resonance wavelength (band) of the antenna does not occur due to a change in the dielectric constant around the antenna due to moisture or sweating of the skin.

  For these reasons, the urination detection system according to the first embodiment using the UHF band IC tag 1 as the urine sensor 10 is not influenced by skin moisture or sweating, and cannot communicate with the reader 12 or the like. By changing from a normal state to a possible state, it is possible to clearly identify whether or not urine, electrolyte, or the like is present around the tag 1, that is, whether or not urination has occurred.

  In the first embodiment, the urine sensor UHF band IC tag 1 having the antenna circuit A having such a pattern detects urination by changing from being impossible to communicate with the reader 12 and the like. On the other hand, the urine sensor UHF band IC tag 2 having the antenna circuit (pattern B) as shown in FIG. 5 (b) changes from being able to communicate with the reader 12 or the like to urinate. Is detected. The urination detection system according to the second embodiment using the UHF band IC tag 2 having the antenna circuit B will be described below.

The antenna circuit B of the UHF band IC tag 2 (FIG. 5B) in the urination detection system of this embodiment is different from the antenna circuit A of the UHF band IC tag 1 in that the impedance is equivalent to the antenna circuit A. in addition to the first loop portion 2 b for matching the impedance of the antenna disturb (mismatch to) impedance second and loop portion 2e is formed for inconsistencies for the upper Symbol second loop part 2 A part of e is provided with a notch portion 2f for electrically disconnecting the second loop portion 2e.

  In FIG. 5B, reference numeral 2a denotes an antenna portion, 2c denotes a bridge portion, and 2d denotes an IC chip connection portion. Further, the notch 2f is formed in a straight line parallel to each other like the notch 1e of the antenna circuit A, and the pattern width (line width) of the parallel (opposite) portions is usually 0.1 mm or more, The extension of the opposing portion in the longitudinal direction is usually 0.1 mm or more. Between these, a groove (a portion having no antenna pattern) having a width of 0.1 mm or more is formed.

  Similarly to the UHF band IC tag 1 of the first embodiment, the region excluding the notch 2f and its vicinity is sealed with a resin sheet, waterproof paper or the like, and the urine sensor UHF band IC tag 2 ( A urine sensor 10) is produced. Further, a hygroscopic bag (packaging) or an upper paper is covered from above, and a double-sided tape or the like for fixing the position of the urine sensor 10 is disposed on the back side of the bag.

When the UHF band IC tag 2 having the antenna circuit B having such a pattern is used as the urine sensor 10, a second loop portion 2e for impedance mismatching is provided in a part of the antenna circuit B, and the second loop Since a notch 2f that electrically cuts off the loop of the second loop portion 2e is formed in a part of the portion 2e, when the urine or electrolyte is not present in the surroundings, the impedance mismatching The circuit (second loop portion 2e ) is not completed, and the resonance wavelength (band) of the antenna is in a range where it can communicate with radio waves of a specific wavelength transmitted from the reader 12 or the like. Therefore, in this state, the urine sensor UHF band IC tag 2 can communicate with the reader 12 and the like.

Then, urine, electrolyte or the like enters the groove formed in the notch 2f and this portion is short-circuited, and only when the antenna is wet when the impedance mismatching circuit (second loop portion 2e ) is completed. The resonance wavelength (band) greatly deviates from the range in which the radio wave having a specific wavelength transmitted from the reader or the like can communicate, and communication with the reader 12 or the like becomes impossible. In the UHF band IC tag 2 as well, as in the UHF band IC tag 1, such a significant shift in the resonance wavelength (band) of the antenna is caused by the dielectric constant around the antenna due to skin moisture, sweating, and the like. It turns out that change does not happen.

  As a result, the urination detection system according to the second embodiment using the UHF band IC tag 2 as the urine sensor 10 is also capable of communicating with the reader 12 and the like without being influenced by skin moisture, sweating, or the like. By changing from a disabled state to an incapable state, it is possible to clearly identify whether urination has occurred.

In the first and second embodiments, the left and right antenna units 1a as shown in FIG. 5 (a ) are used as the antenna circuit pattern for the UHF band IC tag in order to make the characteristics easy to understand. , 1a are connected to each other by a bridge portion 1c, and the antenna circuits A and B having a simplified pattern are illustrated. As a pattern of the antenna portions 1a and 2a for the UHF band, a rectangular shape (solid There are various variations depending on the resonance theory employed , such as spiral coil shapes (7a, 8a) as shown in FIGS . In addition, the pattern of the antenna parts 1a and 2a actually produced has various environmental factors such as the influence of moisture and sweat in the vicinity of the human body, the dielectric constant of the human body itself, the shielding effect, the optimum wavelength and output on the reader side, etc. Considering this, prior adjustment (tuning of the resonance wavelength, etc.) is performed so as to obtain optimal communication conditions when placed in the diaper. Therefore, the pattern of the entire antenna circuit, seemingly impression is, as Reference Example in which case there is the antenna circuitry and seems to be different for UHF band IC tags used in urinary detection system of the present invention described in FIG. 1 FIG. 6 (c) shows a conventional IC tag 6].

  However, the UHF band IC tag for the urine sensor used in the urination detection system of the present invention does not depend on the overall shape of the antenna circuit pattern, but the impedance matching of the antenna circuit represented by the antenna circuit A. UHF band IC tag having a structure (shape) for electrically disconnecting this part (inductance portion) and a part for antenna matching represented by antenna circuit B (inductance part) (inductance part) UHF band IC in which another part for disturbing impedance is provided in another part of the antenna circuit, and a structure (shape) for electrically disconnecting the part is formed in the other part. All tags are included.

For example, when the basic antenna pattern is FIG. 6C, a notch portion 1e for electrically disconnecting the loop portion 1b is formed in a part of the impedance matching loop portion 1b of the antenna circuit. As a modification of the antenna circuit A having the pattern shown in FIG. 5A, an antenna circuit A ′ having a pattern as shown in FIG. Even if the antenna circuit A ′ having such a pattern is employed in the urine sensor UHF band IC tag of the urination detection system of the first embodiment, the urine sensor 10 has the same effect.

Further, for example, a part of the antenna circuit, the second loop portion 2e for impedance mismatch is provided in a portion of the second loop portions 2e, notch electrically disconnected the second loop portions 2e As a modification of the antenna circuit B with the pattern in which the portion 2f is formed (FIG. 5B), the antenna circuit B ′ with the pattern as shown in FIG. 6B is used as the urine detection of the second embodiment. Even when employed in the UHF band IC tag for the urine sensor of the system, the urine sensor 10 can achieve the same effect.

  In either case, the upper surface of the structure (notch shape) that electrically cuts off the antenna is not sealed or laminated with a resin or the like in order to function as a urine sensor. It is kept in a state of being protected by an exterior that allows moisture to penetrate.

  Next, a urination detection system according to a third embodiment in which the HF band IC tag 7 is used as a urine sensor worn by a patient, a cared person, or the like will be described. FIG. 7A is a plan view showing a pattern of the antenna circuit of the HF band IC tag for urine sensor used in the urination detection system of the third embodiment of the present invention, and FIG. It is a top view which shows the state before use which masked other than a sensor part with the resin sheet.

As shown in FIG. 7A, the HF sensor IC tag 7 for the urine sensor in this embodiment also has an antenna circuit (pattern C) that is printed, affixed with a stamped metal foil, vapor deposition, etching, etc. Thus, it is formed by being laminated on the surface of the film-like or sheet-like substrate 3. The antenna circuit C includes an impedance matching structure ( loop) of the antenna portion 7a in a part of the coiled antenna portion 7a, as in the antenna circuit A of the UHF band IC tag 1 in the first embodiment. A cutout portion 7b for electrically disconnecting the portion 7d) and an IC chip connection portion 7c for mounting the IC chip 4 are formed.

The cutout portion 7b is formed in a groove shape that cuts off a part of the coil ( loop portion 7d), and the width (groove width) of the portion without the antenna pattern is 0.05 mm or more. Yes. Prior to use as the urine sensor 10, the region excluding the cutout portion 7b serving as the sensor portion and the vicinity thereof is sealed with a resin sheet 9 or waterproof paper as shown in FIG. 7B. Moreover, when using as the urine sensor 10, the bag (packaging) or upper paper which consists of a hygroscopic raw material, such as a nonwoven fabric and paper, is further covered from it (refer FIG. 2).

Even when the HF band IC tag 7 is used as the urine sensor 10, as in the UHF band IC tag 1 used in the urination detection system of the first embodiment, The impedance matching circuit ( loop part 7d) is not completed, and in this state, communication with a reader or the like is impossible. Then, only when the urine, the electrolyte, etc. enter the groove formed in the notch portion 7b and this portion is short-circuited to complete the impedance matching circuit ( loop portion 7d), the resonance wavelength of this antenna ( The bandwidth is greatly shifted to a range in which communication with a radio wave of a specific wavelength transmitted from the reader or the like is possible. Incidentally, in the case of the configuration of this embodiment, it has been observed that the resonance frequency 44 MHz during drying shifts to 13.8 MHz when wet.

  Therefore, the urination detection system according to the third embodiment using the HF band IC tag 7 changes from a state in which communication with a reader or the like is possible to a state in which communication with a reader or the like is not affected by moisture or sweating of the skin. Thus, it is possible to clearly identify whether or not urine, electrolyte, or the like is present around the tag, that is, whether or not urination has occurred.

  Next, a fourth embodiment in which the HF band IC tag 8 is used as a urine sensor worn by a patient, a cared person, or the like will be described. FIG. 8A is a plan view showing a pattern of the antenna circuit of the HF band IC tag for urine sensor used in the urination detection system of the fourth embodiment of the present invention, and FIG. It is a top view which shows the state before use which masked other than a sensor part with the resin sheet.

As shown in FIG. 8A, the antenna circuit (pattern D) of the HF sensor IC tag 8 for urine sensor in this embodiment also has a printing method, die metal foil pasting, vapor deposition, etching, etc. Thus, it is formed by being laminated on the surface of the film-like or sheet-like substrate 3. The antenna circuit D includes a second loop for impedance mismatching for disturbing (making mismatching) the impedance of the antenna unit 8a, like the antenna circuit B of the UHF band IC tag 2 in the first embodiment. part 8 b are formed, a portion of the second loop portions 8b, notches 8d electrically disconnected the second loop portion 8b is provided. In FIG. 8, reference numeral 8e denotes an impedance matching circuit (first loop section).

  The cutout portion 8d is formed in a straight line parallel to each other like the cutout portion of the antenna circuit B, and the pattern width (line width) of the parallel (opposite) portion is usually 0.1 mm or more, and the opposite portion. The extension in the longitudinal direction of the part is usually 0.1 mm or more. Between these, a groove (a portion having no antenna pattern) having a width of 0.05 mm or more is formed.

  Further, like the HF band IC tag 7 in the third embodiment, as shown in FIG. 8B, the region excluding the notch 8d and the vicinity thereof is sealed with a resin sheet 9 or waterproof paper, The HF band IC tag 8 (urine sensor 10) for urine sensor is produced. In addition, the bag (packaging) or the upper paper which has a hygroscopic property is further covered from the top, and the point that the double-sided tape etc. for fixing the position of the urine sensor 10 etc. is arrange | positioned on the back surface side of this bag is also the same. Yes (see FIG. 2).

Even when the HF band IC tag 8 is used as the urine sensor 10, as in the UHF band IC tag 2 in the urination detection system of the second embodiment, when the urine or the electrolyte is not present in the surroundings, the impedance A circuit for mismatching ( second loop portion 8b) is not completed, and the resonance wavelength (band) of the antenna is in a range in which communication with a radio wave of a specific wavelength transmitted from a reader or the like is possible. Therefore, in this state, the HF sensor IC tag 8 for urine sensor can communicate with a reader or the like.

Then, urine, electrolyte, etc. enter the groove formed in the notch 8d and this portion is short-circuited, and only when the antenna is wet when the impedance mismatching circuit ( second loop portion 8b) is completed. The resonance wavelength (band) deviates significantly from the range in which communication with the radio wave of a specific wavelength transmitted from the reader or the like is made, and communication with the reader or the like becomes impossible. In the case of the configuration of this embodiment, it has been observed that the resonance frequency during drying (usually about 13.2 to 20 MHz) shifts to 100 MHz or more when wet and communication becomes impossible.

  Therefore, the urination detection system according to the fourth embodiment that uses the HF band IC tag 8 as the urine sensor 10 is also not affected by skin moisture, sweating, or the like, and is incapable of communicating with a reader or the like. By changing to the correct state, it is possible to clearly identify whether urination has occurred.

  Next, examples will be described together with comparative examples. However, the present invention is not limited to the following examples.

In this embodiment, the UHF band IC tag for urine sensor, which has been tuned so as to obtain the optimum communication condition when placed in a diaper, is described in FIG. 6B. The UHF band IC tag of the “embodiment 1” employing the antenna circuit B ′ is manufactured, and the UHF band in which the second loop portion 2e (and notch portion 2f) for impedance mismatching is not provided in the antenna circuit With IC tag [see FIG. 6 (c)] as “Comparative Example 1”, wavelength characteristics (frequency characteristics, degree of resonance wavelength shift due to moisture) and communicable distance during drying and after wetting with water (Cm) was compared.

  First, in both Example 1 and Comparative Example 1, an antenna circuit was produced on the substrate 3 by a flexographic printing method. As described above, two types of UHF band IC tag antennas were produced under the same conditions except that the circuit patterns were different.

(Base material)
PET film Lumirror (registered trademark) U34 manufactured by Toray Industries, Inc.
Thickness -75μm Corona treatment on both sides (conductive ink)
InkTec Co. , Ltd., Ltd. TEC-PR-030, manufactured by Korea (Korea)
Component Silver particle-average particle diameter: 20 to 50 nm Content: 40 wt% or less
Binder (organic complex compound) content -35 wt% or less
2-Propanol-10wt% or less Viscosity -500mPa · s

(Flexo printing machine)
FC-33S manufactured by MT Tech
(Flexographic printing plate)
Komura Tech Co., Ltd. Plate thickness-2.25mm
Ink holding amount of ink holding portion for antenna portion printing: 0.1 to 1.5 ml / m ²
Ink holding amount of ink holding part for IC chip connection part printing: ^{2 to 3} ml / m ²

<Creation of antenna circuit pattern>
[Antenna Circuit of Example 1]
The conductive ink was printed and transferred onto the PET base material (3) by the above flexographic printing machine, dried at 120 ° C. for 2 minutes, and the antenna circuit for Example 1 was obtained. Note that the antenna circuit pattern is B ′ as in FIG. 6B as described above, and a second loop portion 2e for impedance mismatching is provided in a part of the pattern, and the second loop portion. A cutout portion 2f that electrically disconnects the second loop portion 2e is formed in a part of 2e. The line width 1 mm of the parallel (opposite) portions in the notch 2 f, the width of the groove (portion where there is no antenna pattern) between them is 1 mm, and the extension in the longitudinal direction of the facing portion is 6 mm.

[Antenna Circuit of Comparative Example 1]
An antenna circuit for Comparative Example 1 was obtained in the same manner as in Example 1 except that the antenna circuit pattern was different [conventional example of FIG. 6 (c)].

Next, a UHF band IC tag was produced using the obtained IC tag antenna circuit.
<Production of UHF band IC tag>
An IC strap (EPC GenII Higgs3) manufactured by Alien Technology is mounted on the IC chip connecting portion of the IC tag antenna circuit of Example 1 and Comparative Example 1 above, and the waterproofing that protects the IC strap and the vicinity thereof is mounted thereon. Paper (protective paper) was laminated (inlet) to produce UHF band IC tags of Example 1 and Comparative Example 1. Note that most of the antenna circuit pattern (including the cutout portion 2f of the second loop portion 2e) is not covered with the waterproof paper and is exposed. Each UHF band IC tag has a resonance wavelength (band) at the time of drying adjusted to about 0.33 to 0.3 m (frequency: 900 MHz to 1 GHz) in consideration of attachment to a human body.

First, using the obtained UHF band IC tags “Example 1” and “Comparative Example 1” for urine sensors, wavelength characteristics (frequency characteristics) during drying and after wetting with water were measured.
<Measurement of wavelength characteristics (frequency characteristics)>
With the test UHF band IC tag attached to the human body (arm skin), frequency characteristics were measured using a Voyantec tag tester (Field Engineer Accessory Kit and Reference Tag). The term “when wet” refers to a measurement that was applied to the arm while wet. In addition, “when dry” refers to what was measured after being attached to the arm in a state where it was not wet with water, but at the time of drying, there was no difference between Example 1 and Comparative Example 1, and the same result was obtained. Expressed as an experimental blank (when dry). The results are shown in the graph of “FIG. 9”.

From this graph, it can be seen that the UHF band IC tag for urine sensor optimized for attachment to the human body has a communication distance of about 4 to 6 m in the blank (when dry). And it turns out that "comparative example 1" which does not have the 2nd loop part for impedance mismatching becomes a communicable distance of about half of the said blank (at the time of drying) at the time of wetness. However, no shift in resonance wavelength is observed. On the other hand, “Example 1” having the notch portion 2f in the second loop portion 2e for impedance mismatching has a communicable distance of about ¼ of the blank (when dry) when wet. It can be seen that the resonance wavelength is also shifted.

<Measurement of communicable distance>
Next, as a more practical test of the urination detection system of the present invention, the test UHF band IC tags of “Example 1” and “Comparative Example 1” are affixed to a human body (arm) and water absorption is performed thereon. In the state where the pad was covered, a communicable distance at a wavelength of 0.315 m (frequency 953 MHz, output 200 mW) was measured using a passive development kit manufactured by Alien Technology.

Experiment 1: A UHF band IC tag for a urine sensor in a dry state was attached on the arm, and a water-absorbing pad in a dry state was put thereon. (Equivalent to drying)
Experiment 2: A wet UHF band IC tag for a urine sensor was affixed on the arm, and a water-absorbing pad in a dry state was placed thereon. (Equivalent to sweating)
Experiment 3: A wet UHF band IC tag for a urine sensor was affixed on the arm, and a water-absorbing pad in a water-absorbed state was covered thereon. (Equivalent to urination)
These results are shown in “Table 1” below.

According to Table 1, the urination detection system using the IC tag of “Comparative Example 1” without the impedance mismatching circuit (second loop portion) can communicate with the reader even in Experiment 3 corresponding to urination. You can see that On the other hand, the urination detection system of the present invention using the IC tag of “Example 1” having the cutout portion 2f in the second loop portion 2e for impedance mismatching is used in Experiment 2 corresponding to sweating. It can be seen that communication is maintained and communication with the reader is disabled only during Experiment 3 corresponding to urination.

  The urination detection system of the present invention using the UHF band IC tag for urine sensor or the HF band IC tag for urine sensor can detect urination without false detection, and in medical facilities, care facilities, elderly care facilities, etc. When urination is detected or abnormal, it is possible to accurately notify (report) the position and state of a patient, a cared person, etc. to medical personnel, a caregiver, etc. through a communication means such as a communication line.

10 Urine sensor 11 Antenna module 12 Reader 13 Control means C Coordinator M Portable information terminal R Router S Server

Claims (4)

Ri UHF band IC tag Tona described below (a), through the urine sensor that will be placed inside the diaper, the antenna module for transmitting and receiving radio waves of a predetermined wavelength corresponding to the UHF band IC tag, the A reader that communicates with the urine sensor at a position away from the antenna module, a recording unit that records signal information of the urine sensor read by the reader, a notification unit that transmits detection of urine to the outside, and the above a timer circuit for transmitting the radio wave at predetermined time intervals from the reader during the transmission of radio waves of a predetermined time interval by the timer circuit, communication between the reader and the urine sensor, a urine sensor The resonance wavelength of the urine sensor does not match the communication wavelength of the reader due to the non-conduction of the impedance matching loop of the antenna circuit due to the absence of urine in the surroundings. From incommunicable state, when changes to the communicable state resonance wavelength of the urine sensor coincides with the communication wavelength leader by the conduction of the loop portion Urine adhering to the cutout portion of the urine sensor, predetermined And a control means for transmitting a urine detection signal to the outside through the notification means.
(A) an antenna circuit of an IC chip and for the UHF band, a part of the antenna circuit is provided with a loop portion for impedance matching, a portion of the loop portion for the impedance matching, this loop part notches electrically disconnected is formed, and by the conduction and non-conduction of the cutout portion, UHF band IC tag resonant wavelength you shift of the antenna circuit. Ri UHF band IC tag Tona described below (b), through the urine sensor that will be placed inside the diaper, the antenna module for transmitting and receiving radio waves of a predetermined wavelength corresponding to the UHF band IC tag, the A reader that communicates with the urine sensor at a position away from the antenna module, a recording unit that records signal information of the urine sensor read by the reader, a notification unit that transmits detection of urine to the outside, and the above a timer circuit for transmitting the radio wave at predetermined time intervals from the reader during the transmission of radio waves of a predetermined time interval by the timer circuit, communication between the reader and the urine sensor, a urine sensor communication friendly resonant wavelength of the urine sensor with non-conduction of the second loop portion for impedance mismatch due to the absence of urine are consistent with the communication wavelength leader around From the state, when the resonance wavelength of the urine sensor has changed to a communication disabled state does not match the communication wavelength leader by the conduction of the second loop portion by the urine adhering to the cut-out of the urine sensor, predetermined And a control means for transmitting a detection signal of urine to the outside through the notification means.
(B) an antenna circuit of an IC chip and for the UHF band, a part of the antenna circuit, a first loop portion for impedance matching, and a second loop portion for impedance mismatch provided , a portion of the second loop portion for the impedance mismatch, notches for electrically disconnected the second loop portion of this is formed by conductive or non-conduction of the cutout portion, the antenna UHF band IC tag resonance wavelength of the circuit you shift. Ri HF band IC tag Tona described below (c), via the urine sensor that will be placed inside the diaper, the antenna module for transmitting and receiving radio waves of a predetermined wavelength corresponding to the HF band IC tag, the A reader that communicates with the urine sensor at a position away from the antenna module, a recording unit that records signal information of the urine sensor read by the reader, a notification unit that transmits detection of urine to the outside, and the above a timer circuit for transmitting the radio wave at predetermined time intervals from the reader during the transmission of radio waves of a predetermined time interval by the timer circuit, communication between the reader and the urine sensor, a urine sensor passing the by non-conduction of the loop portion for impedance matching of the antenna circuit due to the absence of urine around not resonant wavelength of the urine sensor matches the communication wavelength leader From disabled state, when the resonance wavelength of the urine sensor by conduction of the loop portion Urine adhering to the cutout portion of the urine sensor has changed to a communication state which matches with the communication wavelength leader, predetermined urine And a control means for transmitting the detection signal to the outside via the notification means.
(C) an antenna circuit for IC chip and the HF band, a part of the antenna circuit, a loop portion for impedance matching is provided in a portion of the loop portion for the impedance matching, this loop part notches electrically disconnected is formed, and by the conduction and non-conduction of the cutout portion, HF band IC tag resonant wavelength you shift of the antenna circuit. Ri HF band IC tag Tona described below (d), through the urine sensor that will be placed inside the diaper, the antenna module for transmitting and receiving radio waves of a predetermined wavelength corresponding to the HF band IC tag, the A reader that communicates with the urine sensor at a position away from the antenna module, a recording unit that records signal information of the urine sensor read by the reader, a notification unit that transmits detection of urine to the outside, and the above reader and a timer circuit for transmitting the radio wave at predetermined time intervals from between the transmission of radio waves of a predetermined time interval by the timer circuit, the communication between the reader and the urine sensor, urine sensor possible communication of which the resonance wavelength of the urine sensor coincides with the communication wavelength leader by non-conduction of the second loop portion for impedance mismatch due to the absence of urine around From state, when the resonance wavelength of the urine sensor has changed to a communication disabled state does not match the communication wavelength leader by the conduction of the second loop portion by the urine adhering to the cut-out of the urine sensor, predetermined And a control means for transmitting a detection signal of urine to the outside through the notification means.
(D) an antenna circuit for IC chip and the HF band, a part of the antenna circuit, a first loop portion for impedance matching, and a second loop portion for impedance mismatch provided , a portion of the second loop portion for the impedance mismatch, notches for electrically disconnected the second loop portion of this is formed by conductive or non-conduction of the cutout portion, the antenna HF band IC tag resonance wavelength of the circuit you shift.

Images