JP5897901B2 - Sanitary material detection device with RFID tag - Google Patents

Description

  The present invention relates to a detection device for detecting a sanitary material with an RFID tag capable of wireless communication used in a medical field, for example, a gauze with an RFID tag used for surgery.

  During surgery, a large amount of gauze is used for the purpose of wiping off bleeding, etc., but it is extremely difficult to distinguish gauze that has absorbed blood in the body with the naked eye. Accidents that have been misplaced in the body have occurred repeatedly.

  A gauze with an X-ray contrast yarn is used as a means for preventing such a residual accident. In this gauze with an X-ray contrast yarn, an X-ray contrast yarn that hardly transmits X-rays is woven in a streak shape in a part of a gauze made of a woven fabric of cotton yarn.

  However, in the environment of the body, depending on the location, large bones etc. and X-ray contrast thread may overlap and cannot be detected by X-ray imaging. The method of detecting and managing the used gauze is also adopted.

  As a gauze management system for counting used gauze, a reservoir type and a rotary type are known.

  In the reservoir system, a plurality of antennas are arranged around the collection container, and the ID of the gauze in the collection container is read by a high-output detection device. However, when electromagnetic waves such as high-power radio waves are used at medical sites, there is a problem in that peripheral medical devices malfunction due to the electromagnetic waves, and thus a device capable of detecting gauze with low output is desired. .

  In addition, it is necessary to detect a plurality of stacked gauze that are put into the collection container, but in the reservoir method, it is possible to detect a gauze located near the reading antenna provided at the bottom of the collection container. However, there is an inconvenience that a gauze that is far from the reading antenna cannot be detected.

FIG. 7 shows a schematic configuration of the rotational gauze detection device.
In the figure, a rotary gauze detection device includes a drum-type container 50 that can store a plurality of gauze used for surgery, a turntable 51 on which the container 50 is placed, and a hood (not shown) that covers them. ) And a plurality of planar antennas 52 attached to the periphery of the hood. The turntable 51 is rotated by the rotation unit 53 having a drive source, and the gauze G in the container 50 is detected while moving. (For example, refer to Patent Document 1).

JP 2011-15395 A

  According to the rotation type gauze detection device, communication is performed with the RFID tag of the gauze G while rotating the container 50. Therefore, even if the gauze G is inserted in a biased state, uneven reading performance is suppressed. Be able to.

However, if the container 50 is rotated for a certain time, the gauze G in the container 50 does not move, so there is a limit to increasing the reading accuracy.
Further, in the rotating gauze detection device, since a plurality of antennas must be arranged around the container 50, the configuration of the device becomes complicated and expensive.

  The present invention has been made in consideration of the problems in the conventional gauze detection device as described above, and it is possible to reliably detect sanitary materials with RFID tags using a single antenna and electromagnetic waves such as low-power radio waves. An object of the present invention is to provide a device for detecting a sanitary material with an RFID tag.

The present invention includes a rotating drum having an opening into which a sanitary material with an RFID tag is placed and configured to be rotatable, and the RFID tag with the RFID tag disposed in the vicinity of the rotating drum and placed in the rotating drum. In the detection device for the sanitary material with RFID tag having the reading antenna for reading the identification data etc. from the sanitary material,
The rotating drum is a device for detecting a sanitary material with an RFID tag configured to rotate in an inclined posture with an inclined shaft inclined at a predetermined angle with respect to a horizontal axis as a rotational axis.

In the present invention, the angle of the tilt axis is preferably in the range of 10 ° to 30 °.
Moreover, it is preferable that the rotation speed of the said rotating drum exists in the range of 15 rpm or more and 30 rpm or less.

  In the present invention, the reading antenna can be disposed below the outer surface of the body of the rotating drum.

  When the collection box for collecting the sanitary material with the RFID tag is provided below the rotating drum, the rotating drum has an obliquely inclined posture in which the sanitary material with the RFID tag is charged and the sanitary material with the RFID tag. It is preferable to be able to swing between a downward posture and a downward posture.

  An input detection sensor for detecting the input of the sanitary material with the RFID tag can be provided in the vicinity of the opening of the rotating drum.

  In addition, a gauze detection control unit can be provided which receives the input detection signal from the input detection sensor and rotates the rotating drum and starts reading by the reading antenna.

  The RFID tag in the present invention is a so-called passive type that does not have a battery in the RFID tag but rectifies electromagnetic waves emitted from the RFID reader / writer to obtain operating power.

  According to the device for detecting a sanitary material with an RFID tag of the present invention, the sanitary material with an RFID tag can be reliably detected with a single antenna and electromagnetic waves such as a low-power radio wave.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the detection apparatus of the sanitary material with an RFID tag which concerns on this invention is shown, The figure (a) is a top view, The figure (b) is a front view, The figure (c) is a right view. . It is the perspective view which expanded and showed the structure of the rotating drum in the detection apparatus of FIG. (a)-(d) is the graph which measured the frequency | count of reading with the rotating drum of FIG. (a)-(d) is the graph which measured the reading time by the rotating drum of FIG. (a)-(d) is operation | movement explanatory drawing of the detection apparatus shown in FIG. It is a block diagram of the detection system which consists of a detection apparatus shown in FIG. 1, and its peripheral device. It is explanatory drawing which shows schematic structure of the conventional rotation type gauze detection apparatus.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
Specifically, the sanitary material with an RFID tag to be detected is a 300 mm × 300 mm square RFID tag gauze, and φ15 between the X-ray contrast yarn woven along the ear and the gauze edge. A round RFID tag of ˜30 mm is attached. The resonance frequency of the RFID tag is, for example, 14.3 to 15.3 MHz.

  The RFID tag is a passive type, and an IC chip is arranged in a circular sheet as a base material, and an antenna is arranged in a circle around it by copper winding, copper etching, aluminum etching, silver printing, or the like. Furthermore, the RFID tag is hermetically sealed by laminating with two heat resistant films from the upper and lower surfaces thereof, for example, a film made of thermoplastic polymer or elastomer, and a sealant such as a hot melt layer or polyethylene is formed on the lower surface of the laminated film. A layer is formed.

[1] Configuration of Detection Device In FIG. 1, a detection device (hereinafter abbreviated as a detection device) 1 for a sanitary material with an RFID tag includes a main body portion 2 and a touch panel 3 installed on the upper portion of the main body portion 2. It is composed of The touch panel 3 includes a display area for displaying various information related to gauze detection and an operation area for inputting various instructions such as instructions for gauze detection, scale setting for weight measurement, and calibration. Yes.

  The front surface of the main body 2 includes an upper front door 4 and a lower front door 5, and the upper front door 4 can be opened and closed around a vertical axis (see the direction of arrow A). 4a is provided with a gauze charging slope (hereinafter abbreviated as a slope) 6 which can swing in the vertical direction.

The lower front door 5 can be opened and closed around a vertical axis (see arrow B direction), and is opened when the gauze collection box 7 stored in the main body 2 is taken out.
A rotating drum 8 is provided above the gauze collection box 7 in the main body 2. The rotary drum 8 is configured to rotate in an inclined posture with an inclination axis D (see FIG. 5A) inclined by a predetermined angle θ with respect to the horizontal axis as a rotation axis. Opening 8a is provided.

  Moreover, the gauze collection box 7 is placed on the balance 9 so that the weight of the gauze collected in the gauze collection box 7 can be measured.

  In the figure, 2a is a gauze slot of the main body 2, 10 is a side cover, 11 is a back cover, and 12 is a caster for moving the detection device 1.

[1.1] Configuration of Rotating Drum As shown in FIG. 2, a belt 8 b is wound around the outer periphery of the rotating drum 8, and the belt 8 b is a rotating drum motor 8 c provided in the vicinity of the rotating drum 8. The drive pulley 8d is stretched.

  The rotating drum 8 is supported by a frame 8e, and the frame 8e is provided with a swinging shaft 8f for swinging the rotating drum 8 in the direction of arrow C. The swinging shaft 8f supports the belt 8g. To the drive shaft 8h 'of the drum swinging motor 8h.

  A reading antenna (hereinafter referred to as a reading antenna) is disposed along the outer surface of the body portion of the rotary drum 8 below. The reading antenna 14 to be equipped is, for example, an antenna made of copper having an outer shape of 140 ± 0.5 mm × 105 ± 0.5 mm, a turn number of 2 turns, a pattern width of 10 mm and a clearance of 1 mm on a substrate. ing. The resonance frequency of the reading antenna 14 is 13.56 MHz ± 40 kHz.

The reading antenna 14 reads gauze data, specifically, ID information for identifying individual gauze, gauze type information, and the like from the RFID tag of the gauze loaded in the rotary drum 8. .
Reference numeral 6a in the figure is a slope swinging motor for swinging the slope 6, and 6b is a link mechanism connecting the slope 6 and the drive shaft 6a 'of the slope swinging motor 6a.

[1.2] Measurement of Reading Accuracy Each graph in FIG. 3 is a graph obtained by measuring the reading accuracy by the rotating drum 8 having the above-described configuration.
The horizontal axis of each graph indicates the number of rotations (rpm) of the rotating drum 8, and the vertical axis indicates the number of readings per 30 seconds. A broken line in the graph indicates a reference line for determination. When a specific gauze is counted 30 times or more in 30 seconds, it is determined that the reference is cleared. Moreover, the plotted point in the graph represents the average value measured 10 times.

  Graph (a) shows the case where the tilt angle of the rotary shaft of the rotary drum 8 is set to 0 ° (rotates around the horizontal axis), Graph (b) shows the same setting to 30 °, and Graph (c) shows the same 45 °. Graph (d) shows the number of readings when the angle is set to 60 °.

  In the measurement, 5 sheets of gauze were introduced at the same time, and the following 4 types of gauze were prepared assuming actual gauze use conditions.

  That is, “dry open” means a dry and open state, “dry circle” means a dry and curled state, and “wet open” is wet. In addition, it means an open state, and “wet circle” means a wet and rounded state.

  As shown in the graph (a), at an inclination angle of 0 °, the reference values for all gauze states are shown in the ellipses S1, S2, and S3 when the drum rotation speed is 15 rpm, 30 rpm, or 60 rpm. (Read count 30 times) is cleared.

  As shown in the graph (b), at the inclination angle of 30 °, when the drum rotation speed is 15 rpm and 30 rpm, the reference values are cleared for all the gauze states as shown by ellipses S4 and S5.

  As shown in the graph (c), at the inclination angle of 45 °, the reference values are cleared for all the gauze states as shown by the ellipse S6 only when the drum rotation speed is 15 rpm.

  As shown in the graph (d), the reference value was not cleared for all gauze states at an inclination angle of 60 °.

[1.3] Measurement of Reading Time Each graph in FIG. 4 is a graph obtained by measuring the reading time by the rotary drum 8 having the above-described configuration.

  In each graph, the horizontal axis indicates the number of rotations (rpm) of the rotary drum 8, and the vertical axis indicates the reading time (seconds). A broken line in the graph indicates a criterion for determination. In this embodiment, a reading time within 1.0 seconds is used as a temporary criterion. However, there is no practical problem if the reading time exceeds 1.0 seconds and is within 1.5 seconds.

  In the measurement, five pieces of gauze charged were read, and four types of gauze were prepared for the gauze state as in the graph of FIG.

  Graph (a) shows the case where the tilt angle of the rotary drum 8 is set to 0 ° (rotation around the horizontal axis), graph (b) shows the same setting to 30 °, and graph (c) shows the same 45 °. When set, the graph (d) shows the reading time when the angle is set to 60 °.

  As shown in the graph (a), at an inclination angle of 0 °, the reference value (reading time within 1.0 second) is cleared for all gauze states as shown by an ellipse S7 when the drum rotation speed is 30 rpm. ing.

  At an inclination angle of 30 ° shown in the graph (b), when the drum rotation speed is 15 rpm and 30 rpm, the reference values are cleared for all the gauze states as shown by ellipses S8 and S9.

  Regarding the graphs (a) and (b), when the reference of the reading time is within 1.5 seconds, the reference is cleared even when the rotational speed of the rotary drum 8 is 60 rpm.

  At the inclination angles of 45 ° and 60 ° shown in the graphs (c) and (d), the reference values are cleared for all the gauze states as shown by the ellipses S10 and S11 only when the drum rotation speed is 60 rpm.

  From the measurement result of the number of readings and the measurement result of the reading time, the inclination angle of the rotating shaft of the rotating drum 8 is preferably in the range of 0 ° to 30 °, more preferably 10 ° to 30 °. It is a range.

  When the angle of the tilt axis is 0 °, the gauze thrown into the rotary drum 8 may jump out. Therefore, it is preferable to set the angle to 10 ° or more when no pop-out prevention measures are taken. If the angle of the tilt axis exceeds 30 °, the reference value cannot be cleared for all the gauze states as shown in the graph of FIG.

  Further, if the rotational speed of the rotary drum 8 is in the range of 15 rpm or more and 30 rpm or less, the reference for the number of readings is satisfied. Furthermore, if it is within the range of 15 rpm or more and 30 rpm or less, it can be read in a short time.

  If the rotational speed of the rotating drum 8 exceeds 60 rpm, the gauze thrown into the rotating drum 8 remains on the inner wall of the drum body due to centrifugal force and does not move, so that the reading accuracy decreases.

[2] Operation of Detection Device FIGS. 5A to 5D are explanatory diagrams showing the operation of the detection device 1.
In each drawing, the side cover 10 and the touch panel 3 are removed in order to make the operation of each part in the main body 2 easy to understand.

[2.1] Gauze loading In FIG. 5 (a), in the standby state, the slope 6 is open (tilted downward), and the used gauze G loaded from the gauze loading port 2a is the slope 6 Is put into the rotating drum 8.

  In the vicinity of the opening 8 a of the rotating drum 8, a closing detection sensor 13 that detects the passage of the gauze G is provided, and the rotating drum 8 is rotated by the detection of the insertion of the gauze G as a trigger. The gauze data is read from the RFID tag of the loaded gauze G through the reading antenna 14 provided below the gauze G.

[2.2] Detection of gauze In FIG. 5 (b), by reading the gauze data from the RFID tag of the loaded gauze G, it is confirmed that the number of the loaded gauze G has reached a preset number. The slope 6 rises and is closed, and the detected (counted) gauze G starts to be discharged.

[2.3] Discharge of gauze In FIG. 5 (c), the opening 8 a of the rotating drum 8 is directed downward, and the counted gauze G is dropped into the gauze collection box 7.
At this time, it is also possible to perform the discharging operation while the rotating drum 8 continues to rotate so that the gauze G is reliably discharged.
During this time, the gauze G ′ introduced into the detection device 1 is temporarily deposited on the closed slope 6.

[2.4] Resumption of gauze count In FIG. 5 (d), the rotating drum 8 takes a downward posture for a predetermined time, and then returns to the standby posture shown in FIG. 5 (a).
When the rotating drum 8 returns to the standby position, the slope 6 opens and the gauze can be charged again. When the gauze G ′ is input while the slope 6 is closed, the gauze G ′ rolls on the open slope 6 and is input into the rotary drum 8.

[3] Detection System FIG. 6 is a block diagram of a detection system including the detection device and its peripheral devices.
In the figure, the detection system is mainly composed of a detection device 1 having the above-described configuration and a registration device 20 that transmits / receives data to / from the detection device 1.

  The registration device 20 includes a registration antenna 20b for registering the gauze before surgery in the registration control unit 20a, and a search antenna 20c for performing a search when the gauze remains in the body. These antennas are switched by a switcher 20d. The gauze data read through the registration antenna 20b is given to the registration control unit 20a through the R / W module 20e.

  The gauze data processed by the registration control unit 20a is displayed on the display unit 20f by specifying, for example, the type of gauze and the number of gauze pieces on the display unit 20f, and is detected via the wireless module 20g. It is transmitted to the 1 side. In the figure, reference numeral 20h denotes a switch for inputting a switching instruction for switching between the registration antenna 20b and the search antenna 20c.

The gauze data sent from the registration control unit 20 is given to the gauze detection control unit 22 of the detection apparatus 1 via the wireless module 21.
In the detection device 1, the reading antenna 14 transmits radio waves to the rotating drum 8 and receives gauze data from the RFID tag of the gauze G operated by the radio waves.

The gauze data read via the reading antenna 14 is given to the gauze detection control unit 22 through the R / W module 23, and the gauze weight data measured by the balance 9 is also given to the gauze detection control unit 22. Yes.
The gauze detection control unit 22 processes the given gauze data to display the type and number of the gauze on the touch panel 3, processes the gauze weight data to calculate the adsorbed blood volume of the gauze, and displays it on the touch panel 3.

The gauze detection control unit 22 also controls the rotary drum motor 8 c that drives the rotary drum 8.
Further, the insertion detection sensor 13 described above is connected to the gauze detection control unit 22, and when a detection signal for detecting the passage of the gauze G is given, the rotary drum motor 8 is driven to rotate the rotary drum 8. The operation for detecting the gauze G charged in the rotary drum 8 is started.

  The gauze detection control unit 22 is connected to a speaker 25 for notifying various sound sources when detecting gauze, searching the body of the gauze, various sensors 26, and a printer 27 for printing gauze count results.

DESCRIPTION OF SYMBOLS 1 Detection apparatus 2 Main-body part 2a Gauze insertion slot 3 Touch panel 4 Upper front door 5 Lower front door 6 Slope 7 Gauze collection box 8 Rotating drum 8a Opening 9 Scale 10 Side cover 11 Back cover 12 Caster 13 Input detection sensor 14 Reading antenna

Claims (6)

A rotary drum having an opening into which a sanitary material with an RFID tag is inserted and configured to be rotatable, and the sanitary material with an RFID tag disposed in the vicinity of the rotary drum and placed in the rotary drum In a detection device for sanitary materials with RFID tags having a reading antenna for reading data and the like,
The rotating drum is configured to rotate in an inclined posture with an inclination axis inclined at a predetermined angle with respect to a horizontal axis as a rotation axis ,
A collection box for collecting the sanitary material with the RFID tag is provided below the rotating drum, and the rotating drum discharges the sanitary material with the RFID tag and an obliquely upward inclined posture into which the sanitary material with the RFID tag is charged. An apparatus for detecting a sanitary material with an RFID tag, characterized in that the apparatus can swing between a downward posture .   The device for detecting a sanitary material with an RFID tag according to claim 1, wherein an angle of the tilt axis is in a range of 10 ° to 30 °.   The device for detecting a sanitary material with an RFID tag according to claim 2, wherein the number of revolutions of the rotating drum is in a range of 15 rpm to 30 rpm.   The device for detecting a sanitary material with an RFID tag according to claim 1, wherein the reading antenna is disposed below the outer surface of the body of the rotating drum.   The detection apparatus of the sanitary material with an RFID tag according to claim 1, wherein an input detection sensor for detecting the input of the sanitary material with an RFID tag is provided in the vicinity of the opening of the rotating drum. The sanitary material detecting apparatus with an RFID tag according to claim 5 , further comprising a gauze detection control unit that receives the input detection signal from the input detection sensor, rotates the rotating drum, and starts reading by the reading antenna.