WO2016027756A1 - Article absorbant chirurgical, dispositif de détection, et procédé de détection - Google Patents

Article absorbant chirurgical, dispositif de détection, et procédé de détection Download PDF

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Publication number
WO2016027756A1
WO2016027756A1 PCT/JP2015/073001 JP2015073001W WO2016027756A1 WO 2016027756 A1 WO2016027756 A1 WO 2016027756A1 JP 2015073001 W JP2015073001 W JP 2015073001W WO 2016027756 A1 WO2016027756 A1 WO 2016027756A1
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Prior art keywords
signal
absorbent article
detection
sensor unit
phase difference
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PCT/JP2015/073001
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English (en)
Japanese (ja)
Inventor
弘美 西村
顕成 檜
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弘美 西村
顕成 檜
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Application filed by 弘美 西村, 顕成 檜 filed Critical 弘美 西村
Publication of WO2016027756A1 publication Critical patent/WO2016027756A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques

Definitions

  • the present invention relates to an absorbent article for surgery capable of absorbing bodily fluids and the like, and a detection device and a detection method capable of detecting the absorbent article for surgery, and more specifically, can be easily detected and remain in the body.
  • the present invention relates to an absorbent article for surgery, a detection device, and a detection method.
  • Surgery uses a large amount of surgical absorbent articles such as gauze, but the surgical absorbent articles absorb blood, making it difficult to identify, or being sandwiched between organs. There is a possibility that mistakes will be made. Usually, the number of surgical absorbent articles is counted before and after surgery to prevent misplacement, but it is very labor intensive and is not reliable.
  • Patent Document 1 an X-contrast thread is woven into a surgical gauze so that even if the gauze is left behind, it can be detected by X-ray imaging.
  • Patent Document 2 information such as the position of a medical instrument is detected in a non-contact manner by attaching an RFID tag to a medical instrument such as a surgical gauze.
  • a medical instrument such as a surgical gauze.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a surgical absorbent article, a detection apparatus, and a detection that can be easily detected and can avoid a significant cost increase. Is to provide a method.
  • the present invention relates to a first invention relating to a surgical absorbent article, a second invention relating to a detection device for detecting a surgical absorbent article, a third invention relating to a detection method for detecting a surgical absorbent article, and a third invention. 4 inventions.
  • a first invention is an absorbent article for surgery capable of absorbing bodily fluids, etc., comprising an article body having absorbency, and a thin wire electric conductor attached to the article body and capable of bending deformation,
  • the electric conductor is characterized by having an annular portion.
  • “Bendable” means that the article body has a flexibility that can be deformed following the bending or twisting of the article body.
  • the annular portion refers to a shape in which one or two or more closed electrically connected spaces are formed by an electric conductor, and has a structure in which an overcurrent flows due to external ground fluctuations.
  • the electric conductor may be disposed along an edge of the article main body.
  • the term "along the edge of the article main body" includes not only those provided along the edges but also those provided along the vicinity of the edges.
  • a second invention is a detection device for a surgical absorbent article capable of absorbing bodily fluids, etc., wherein the surgical absorbent article is attached to the absorbent article main body and attached to the article main body and can be bent and deformed.
  • An electric conductor having an annular portion of a thin wire, an oscillation unit that outputs an excitation signal, a sensor unit that includes an excitation coil that inputs the excitation signal and a detection coil that outputs a detection signal, and the sensor Detecting the amplitude of the signal from the unit, outputting the amplitude signal, detecting the phase difference between the signal from the sensor unit and the excitation signal, and outputting the phase difference signal; and the amplitude signal or A signal processing unit for determining whether or not the surgical absorbent article exists in the vicinity based on the phase difference signal.
  • a third invention is a method for detecting an absorbent article for surgery capable of absorbing bodily fluids, etc., wherein the absorbent article for surgery is attached to the article body having an absorbency, and can be bent and deformed.
  • An electric conductor having an annular portion of a thin wire, an oscillation unit that outputs an excitation signal, a sensor unit that includes an excitation coil that inputs the excitation signal and a detection coil that outputs a detection signal, and the sensor Detecting the amplitude of the signal from the unit, outputting the amplitude signal, detecting the phase difference between the signal from the sensor unit and the excitation signal, and outputting the phase difference signal; and the amplitude signal or A signal processing unit that determines whether or not the surgical absorbent article is present in the vicinity based on the phase difference signal, and a relative relationship between the surgical absorbent article and the sensor unit. Change position Is allowed, the signal processing unit, wherein the amplitude signal or the absorbent article for the surgery based on the phase difference signal to determine whether present in
  • a fourth invention is a method for detecting an absorbent article for surgery capable of absorbing bodily fluids, etc., wherein the absorbent article for surgery is attached to the article body, and is attached to the article body and bendable.
  • An electric conductor having an annular portion of a thin wire, an oscillation unit that outputs an excitation signal, a sensor unit that includes an excitation coil that inputs the excitation signal and a detection coil that outputs a detection signal, and the sensor Detecting the amplitude of the signal from the unit, outputting the amplitude signal, detecting the phase difference between the signal from the sensor unit and the excitation signal, and outputting the phase difference signal; and the amplitude signal or And a signal processing unit that determines whether or not the surgical absorbent article exists in the vicinity based on the phase difference signal, and the amplitude signal or the phase difference signal before and after surgery. Constant, and the signal processing section is characterized by determining whether the amplitude signal or difference absorbent articles for the surgery based on the phase difference signal before and after
  • the present invention it is possible to provide an inexpensive surgical absorbent article, a detection apparatus, and a detection method that can be easily detected without using a special apparatus such as X-ray imaging.
  • the figure which shows one embodiment of the absorbent article for surgery The figure which shows the other embodiment of the absorbent article for surgery.
  • Device configuration diagram of the detection device The figure explaining the 1st structural example of a sensor part.
  • the figure explaining the 1st detection method The figure explaining the 2nd detection method Graph showing plate shape and detection distance of annular part Graph showing the relationship between the number of annular parts and the detection distance Graph showing detection distance for each material of electrical conductor Graph showing the relationship between the number of turns of the annular part and the detection distance
  • FIG. 1 shows an embodiment of the surgical absorbent article 1 of the present invention.
  • the absorbent article for surgery 1 includes an absorbent article main body 11 and an electric conductor 12 attached to the article main body 11.
  • the article body 11 can be made of either woven fabric or non-woven fabric. In this embodiment, a gauze in which warp and weft are plain woven is used as the article body 11.
  • the electric conductor 12 a thin wire capable of bending deformation such as a silver wire or a copper wire can be used.
  • the electric conductor 12 is provided along the edge 11 ⁇ / b> A of the article body 11 and forms an annular portion 13 as a whole. In the annular portion 13, one end and the other end of the electric conductor 12 are in contact with each other and are electrically connected.
  • the annular portion 13 may be circular or polygonal as long as it forms a closed space by the electric conductor 12.
  • the electrical conductor 12 may form the annular portion 13 by a single thin wire, or may form a stranded wire by a plurality of fine wires and constitute the annular portion 13 by this stranded wire. Good. By using a stranded wire, even if a part of the fine wire constituting the stranded wire is cut, it can be kept electrically connected by another fine wire, and the characteristics of overcurrent generation can be maintained.
  • the electric conductor 12 can be fixed to the article main body 11 by weaving in the warp or weft of the gauze. It can also be sandwiched and fixed between two sheets of gauze. Moreover, when using a nonwoven fabric for the article main body 11, the electric conductor 12 can be fixed in the process of making the nonwoven fabric, or can be fixed by pressure bonding to the nonwoven fabric. The electric conductor 12 may be partially fixed to the article body 11.
  • the upper limit of the area of the annular portion 13 is determined depending on the area of the article main body 11.
  • the electrical conductor 12 uses a single thin wire or a stranded wire bundled with the thin wires, the original flexibility and absorbability of the surgical absorbent article 1 are impaired. There is nothing.
  • the annular portion 13 formed by the electric conductor 12 may be two or more.
  • FIG. 2A shows a plurality of independent annular portions 13 formed. That is, when the article main body 11 is flattened as illustrated, the adjacent annular portions 13 are independent without contacting each other.
  • FIG. 2B a part of the adjacent annular portions 13 are in contact with each other. That is, in this article body 11, a plurality of electrical conductors 12 are arranged in parallel to the warp and the weft, and the electrical conductor 12 extending in the longitudinal direction and the electrical conductor 12 extending in the lateral direction are overlapped with each other. Part 13 is formed. In this case, the electrical conductors 12 that overlap each other can be fixed to the article body 11 by pressure bonding.
  • the electrical conductor 12 may form the annular portion 13 at the edge 11A of the article main body 11 so as to also prevent warp or weft fraying. Generally, when gauze is used, warp yarn or weft yarn is bent using a warp yarn so that the break is not unraveled. By bending, the annular portion 13 can be formed along the edge 11A.
  • the electrical conductor 12 is preferably a stranded wire.
  • the electric conductor 12 can be securely fixed to the article main body 11 by crimping the overlapping portion so that the electric conductors 12 overlap each other at the beginning and end of the overburden. It is also possible to perform pressure bonding or the like at portions other than the beginning and end of over-curving.
  • the electrical conductor 12 can be coated with a coating material considering biocompatibility.
  • a coating material considering biocompatibility.
  • a liquid-impermeable polyurethane resin or the like can be used.
  • FIG. 3 is a device configuration diagram of the detection device 2.
  • the detection device 2 includes an oscillation unit 21, a sensor unit 22, a filter unit 23, a first amplification unit 24, a signal detection unit 25, a sensor position detection unit 26, a second amplification unit 27, a signal processing unit 28, and a processing result output unit 29. Etc.
  • the oscillation unit 21 oscillates a sine wave signal (an AC signal having a constant oscillation frequency) and outputs an excitation signal to the excitation coil of the sensor unit 22.
  • the oscillating unit 21 may oscillate a rectangular wave signal instead of the sine wave signal.
  • the sensor unit 22 includes an excitation coil that inputs an excitation signal transmitted from the oscillation unit 21, and a detection coil that detects the absorbent article for surgery 1 and outputs a detection signal to the filter unit 23. Only one sensor unit 22 may be provided for one detection device 2 or a plurality of sensor units 22 may be provided.
  • the electrical conduction is caused by the influence of the magnetic field fluctuation generated from the excitation coil.
  • An eddy current that generates a magnetic force in a direction to cancel the magnetic field flow flows through the annular portion 13 of the body 12 (Faraday's law of electromagnetic induction).
  • the magnetic field fluctuation generated in the detection coil becomes small, and the signal output from the detection coil becomes small.
  • the sensor unit 22 detects the surgical absorbent article 1 to be detected by detecting the change in the magnetic field fluctuation.
  • the sensor unit 22 can detect any type of ferromagnetic material, paramagnetic material, and diamagnetic material.
  • a ferromagnetic material for example, when the relative permeability is much larger than 1, such as iron or permalloy, the magnetic flux generated by the exciting coil is focused, which is superior to the influence of the eddy current, and is applied to the detection coil.
  • the resulting signal is larger. That is, the characteristics of the signal change of the detection coil when an eddy current is generated in the annular portion 13 due to the magnetic field fluctuation generated in the excitation coil, and the detection coil when the iron or permalloy having a relative permeability much larger than 1 is detected.
  • the direction of the signal change is in the opposite direction.
  • an operating table frame (mainly stainless steel).
  • silver, copper, or the like having a low electrical resistivity for the electrical conductor 12 of the surgical absorbent article 1. This makes it possible to detect the surgical absorbent article 1 with high accuracy even when a metal object is present around the patient.
  • the filter unit 23 includes a band pass filter (band bus filter) that allows only the oscillation frequency in the oscillation unit 21 to pass.
  • band pass filter band bus filter
  • various electromagnetic waves emitted from an electric device using a general power source are also detected. These electromagnetic waves become noise in the detection device 2 that detects the surgical absorbent article 1. Therefore, using the difference between this noise and the oscillation frequency input to the excitation coil of the sensor unit 22, the filter unit 23 cuts the noise and passes only a signal that matches the oscillation frequency.
  • the first amplification unit 24 amplifies the signal output from the filter unit 23 and outputs the amplified signal to the signal detection unit 25.
  • the signal detection unit 25 includes an amplitude detection circuit and a phase difference detection circuit.
  • the amplitude detection circuit the amplitude of the signal output from the first amplifying unit 24 is detected by the rectifier circuit, and the amplitude signal is output.
  • the phase difference detection circuit detects the phase difference between the signal output from the first amplification unit 24 and the signal output from the oscillation unit 21 by the rectifier circuit, and outputs a phase difference signal.
  • the sensor position detection unit 26 detects the installation position of the sensor unit 22 when one sensor unit 22 or a plurality of sensor units 22 are arranged one-dimensionally and two-dimensional mapping is performed. Two-dimensional mapping means that the detection signal output from the sensor unit 22 is associated with the detection position and imaged.
  • the sensor position detection unit 26 stores the installation position of each sensor unit 22 and associates each sensor unit 22 with a signal output from each sensor unit 22. 22 installation positions are output.
  • the sensor position detection unit 26 When the sensor unit 22 is used while being moved, the sensor position detection unit 26 includes an acceleration sensor and the like, calculates a relative position with respect to the movement start position based on the movement direction and the movement distance of the sensor unit 22, and The installation position of each sensor unit 22 is output in association with the output signal.
  • the second amplification unit 27 amplifies the amplitude signal and the phase difference signal output from the signal detection unit 25.
  • the amplitude signal increases.
  • the phase difference signal changes when an object having a high relative permeability (a metal object existing around the patient) approaches the sensor unit 22 and an object that generates eddy currents in the sensor unit 22 (material of the electric conductor 12).
  • the change when the electrical resistivity is small is in the opposite direction.
  • the detection device 2 distinguishes the surgical absorbent article 1 from other objects based on the amplitude signal and the phase difference signal having these characteristics.
  • the signal processing unit 28 includes an AD conversion circuit, a computer, and the like, and determines whether or not the surgical absorbent article 1 exists in the vicinity based on the amplitude signal or the phase difference signal.
  • the AD conversion circuit receives a signal from the second amplification unit 27 and outputs the signal to the computer.
  • the computer inputs a signal from the AD conversion circuit, performs a predetermined measurement process, and outputs the signal to the processing result output unit 29.
  • the AD converter circuit analog-digital converts the amplitude signal and the phase difference signal output from the second amplification unit 27.
  • the computer processes digital data input from a processing result output unit or an AD conversion circuit.
  • the computer outputs the measurement result of the amplitude signal and the phase difference signal to the processing result output unit 29.
  • the computer outputs an alarm output instruction signal to the processing result output unit 29.
  • the processing result output unit 29 includes a measurement result display circuit, an alarm output circuit, and the like.
  • the measurement result display circuit displays the measurement results of the amplitude signal and the phase difference signal output from the computer.
  • an alarm output instruction signal is output from the computer, the alarm output circuit issues an alarm with light or sound.
  • FIG. 4 is a diagram illustrating a first configuration example of the sensor unit 22.
  • one annular excitation coil 31 and two annular detection coils 32 and 33 are provided in the sensor unit 22a of the first configuration example.
  • the detection coils 32 and 33 are provided inside the excitation coil 31.
  • the detection coils 32 and 33 are not located on the same axis but are located on substantially the same plane. In other words, part of the outer peripheral surfaces of the detection coils 32 and 33 face each other.
  • the exciting coil 31 and the detection coils 32 and 33 are wound by a predetermined number of turns.
  • the detection coils 32 and 33 have substantially the same number of turns, axial length, and cross-sectional area perpendicular to the axial direction.
  • FIG. 4B shows an equivalent circuit of the first configuration example. As shown in FIG. 4B, the winding direction of the detection coil 32 and the winding direction of the detection coil 33 are opposite.
  • the winding direction of the exciting coil 31 may be any direction.
  • the output signals of the detection coils 32 and 33 are adjusted so as to be balanced when the electric conductor 12 to be detected does not exist in the vicinity of the sensor unit 22. Since the winding direction of the detection coil 32 and the winding direction of the detection coil 33 are opposite, the output signals of the detection coils 32 and 33 cancel each other and are output to the filter unit 23 in a balanced state. The amplitude and phase difference are substantially zero. In this state, when the sensor unit 22 approaches the electric conductor 12 to be detected, the balance of the detection coils 32 and 33 is lost, and the amplitude of the signal output to the filter unit 23 increases. At this time, the phase of the signal output to the filter unit 23 also changes. The sensor unit 22a detects the electric conductor 12 to be detected based on the change in amplitude and phase.
  • the two detection coils 32 and 33 are provided on the same plane.
  • the excitation coil 31 and the detection coils 32 and 33 may not be provided on the same plane.
  • the sensor unit 22a of the first configuration example has a relatively large size in structure. Therefore, it is suitable when the absorbent article 1 for surgery is detected by one sensor part 22a.
  • FIG. 5 is a diagram illustrating a second configuration example of the sensor unit 22 and is a perspective view in which a part is cut.
  • one ferrite core 41 in the sensor unit 22b of the second configuration example, one ferrite core 41, one annular excitation coil 42, and two annular detection coils 43 and 44 are provided.
  • the ferrite core 41 is a rod having a longitudinal direction.
  • the two annular detection coils 43 and 44 are located on the outer peripheral side of the ferrite core 41, are spaced apart from each other in the longitudinal direction of the ferrite core 41, and are coaxially located.
  • the excitation coil 42 is located on the outer peripheral side of the detection coils 43 and 44.
  • the cross sections of the excitation coil 42 and the detection coils 43 and 44 are shown by oblique lines, but in actuality, a predetermined number of windings are wound.
  • the detection coils 43 and 44 have substantially the same number of turns, axial length, and cross-sectional area perpendicular to the axial direction.
  • FIG. 5B shows an equivalent circuit of the second configuration example. As shown in FIG. 5B, the winding direction of the detection coil 43 and the winding direction of the detection coil 44 are opposite.
  • the winding direction of the exciting coil 42 may be any direction.
  • the output signals of the detection coils 43 and 44 are adjusted so as to be in a balanced state when the electric conductor 12 to be detected does not exist in the vicinity of the sensor unit 22.
  • the sensor unit 22a can detect the electrical conductor 12 to be detected based on the change in the amplitude and the phase.
  • the size can be reduced due to the structure. Therefore, it is suitable for the case where the absorbent article for surgery 1 is detected by the plurality of sensor portions 22b.
  • the excitation coil 42 may be shared, and a plurality of ferrite cores 41 and detection coils 43 and 44 may be provided inside one excitation coil 42.
  • the detection apparatus 2 of the present invention it is possible to accurately detect the surgical absorbent article 1 without being affected by geomagnetism or commercial power.
  • the surgical absorbent article 1 is detected by moving the patient after the operation.
  • the sensor unit 22 of the detection device 2 is fixed to the bottom plate 51 of the operating table 5.
  • the sensor unit 22 is installed inside the base unit 53 of the operating table 5.
  • the cross-sectional area in the horizontal direction X of the sensor unit 22 (if there are a plurality of areas, the combined area of the cross-sectional areas in the horizontal direction X of the plurality of sensor units 22) is wider than the surgical site.
  • the bed 52 of the operating table 5 is slidable in the horizontal direction X.
  • the operating table 5 has a metal frame, or a metal device is installed around the operating table 5.
  • the detection device 2 is activated in a state where the patient is placed on the bed 52 after the operation, and the bed 52 is slid in the horizontal direction X. Therefore, when the surgical absorbent article 1 exists in the patient's body, the relative position between the electrical conductor 12 and the sensor unit 22 changes. Then, the signal processing unit 28 of the detection device 2 compares the amplitude signal or the phase difference signal with a preset threshold value. This makes it possible to detect whether or not the surgical absorbent article 1 remains in the patient's body. On the other hand, since the relative position between the metal frame of the operating table 5 or other metal device and the sensor unit 22 does not change, there is no influence on the amplitude signal and the phase difference signal. Therefore, according to the first detection method, the metal frame of the operating table 5 and the surrounding metal device are not erroneously detected as the surgical absorbent article 1, and the surgical absorbent article 1 can be accurately detected. Can be detected.
  • the bed 52 of the operating table 5 is slid in the horizontal direction X, but detection can also be performed when the patient is transferred from the operating table 5 to a stretcher or the like after the operation.
  • detection can also be performed when the patient is transferred from the operating table 5 to a stretcher or the like after the operation.
  • the patient is transferred from the operating table 5 to a stretcher or the like, since the relative position of the patient and the sensor unit 22 changes, it is possible to detect the residual surgical absorbent article 1 as described above. .
  • 2nd detection method detects the absorbent article 1 for a surgery by moving the sensor part 22 in the upper part of a surgery site
  • the patient is transferred to a non-metallic bed 6 made of wood or resin, and the sensor unit 22 is moved in the horizontal direction X above the surgical site.
  • the cross-sectional area in the horizontal direction X of the sensor unit 22 may be narrower than the surgical site, but the range in which the sensor unit 22 is moved is wider than the surgical site. This makes it possible to detect the remaining surgical absorbent article 1 as in the first detection method.
  • the surgical absorbent article 1 can be detected with high accuracy.
  • 3rd detection method detects the absorbent article 1 for a surgery by moving the sensor part 22 in the upper part of a surgery site
  • one sensor unit 22 or a plurality of sensor units 22 may be used.
  • the one-dimensional array sensor Before the operation, the one-dimensional array sensor is moved in the horizontal direction X so as to cover the entire operation site above the operation site, and the signal processing unit 28 stores the position of each sensor unit 22 and the magnitude of the amplitude signal. After the operation, the one-dimensional array sensor is moved from the same start position as before the operation to the same end position in the same direction as before the operation at the upper part of the operation site, and the signal processing unit 28 determines the position of each sensor unit 22 and the magnitude of the amplitude signal.
  • the signal processing part 28 determines with the absorbent article 1 for a surgery being in a patient's body, when the difference of the amplitude signal before and behind an operation exceeds a threshold value in any position.
  • the same determination can be made by moving the sensor unit 22 so as to cover the entire surgical site.
  • the same determination can be made by moving the sensor unit 22 so as to cover the entire surgical site. Further, when the two-dimensional array sensor is wider than the surgical site, the same determination can be made without moving the two-dimensional array sensor.
  • the magnitudes of the amplitude signal and the phase difference signal are associated with the detection position. Therefore, the signal processing unit 28 may perform two-dimensional mapping on the magnitudes of the amplitude signal and the phase difference signal, and the processing result output unit 29 may display the image data.
  • the metal frame of the operating table 5 or the surrounding metal device can be clearly distinguished from the surgical absorbent article 1, and the surgical absorbent article 1 can be detected more reliably. . Moreover, it becomes possible to specify the presence position of the absorbent article 1 for surgery.
  • the absorbent article for surgery 1 is detected by moving the sensor unit 22 in the vicinity of the surgical site during or after surgery.
  • one small sensor unit 22 is used.
  • the sensor unit 22b of the second configuration example shown in FIG. 5 can be downsized. This makes it possible to detect the remaining surgical absorbent article 1 as in the first detection method.
  • the distance between the sensor unit 22 and the metal frame of the operating table 5 and the surrounding metal device is relatively larger than the distance between the sensor unit 22 and the surgical site. It will be far away. Therefore, it is difficult to be affected by the metal frame of the operating table 5 and surrounding metal devices, and the surgical absorbent article 1 can be detected with high accuracy.
  • FIG. 8 is a graph showing the plate shape and the detection distance of the annular portion.
  • Graph A shows the relationship between the length of one side of the square and the detection distance for a copper wire (wire diameter 0.5 mm) forming a square annular portion.
  • Graph B shows the relationship between the length of one side of the square and the detection distance for a copper plate (thickness 0.5 mm) having a square plate shape.
  • FIG. 9 is a graph showing the relationship between the number of annular portions and the detection distance.
  • FIG. 9 shows the relationship between the number of annular portions made of copper wire having a wire diameter of 0.45 mm and the detection distance inside a square having a side of 5 cm.
  • the detection distance becomes shorter as the number of annular portions increases. From this result, it can be seen that it is desirable that the number of annular portions as the electric conductor 12 provided in the surgical absorbent article 1 of the present invention is smaller. However, when there is one annular part, detection becomes difficult if one is broken. Therefore, as a countermeasure against disconnection, the surgical absorbent article 1 according to the present invention may be provided with four or sixteen annular portions having a relatively long detection distance.
  • FIG. 10 is a graph showing the detection distance for each material of the electrical conductor.
  • copper having a wire diameter of 0.3 mm copper having a wire diameter of 0.5 mm, silver having a wire diameter of 0.3 mm, silver having a wire diameter of 0.5 mm, iron having a wire diameter of 0.55 mm (SS400), and a wire, respectively.
  • the relationship between the diameter of a circular annular part made of stainless steel (SUS304) having a diameter of 0.55 mm and the detection distance is shown.
  • the longer the diameter of the annular portion the longer the detection distance.
  • the longer the diameter of the annular portion the longer the wire length of the electric conductor 12, and the electric resistance increases in proportion to the wire length of the electric conductor 12. Therefore, the relationship between the diameter of the annular portion and the detection distance is not a linear relationship, and even if the diameter of the annular portion is increased more than necessary, an increase in the detection distance cannot be expected.
  • the material of the electric conductor 12 is more preferably silver or copper than iron (SS400) or stainless steel (SUS304). This is presumably because silver and copper have extremely low electrical resistivity compared to iron (SS400) and stainless steel (SUS304). Moreover, since silver and copper have substantially the same electrical resistivity, the detection distance is also substantially the same.
  • FIG. 11 is a graph showing the relationship between the number of turns of the annular portion and the detection distance.
  • FIG. 11 shows the relationship between the number of turns and the detection distance of a circular annular portion with a diameter of 30 mm made of a copper wire with a diameter of 0.5 mm.
  • the greater the number of turns of the annular portion the longer the detection distance.
  • the greater the number of turns of the annular portion the longer the wire length of the electric conductor 12, and the electric resistance increases in proportion to the wire length of the electric conductor 12. Therefore, the relationship between the number of turns of the annular portion and the detection distance is not a linear relationship, and even if the number of turns of the annular portion is increased more than necessary, an increase in the detection distance cannot be expected.
  • the detection distance can be increased while suppressing an increase in electrical resistance. This is the same effect as increasing the wire diameter in terms of detection distance.

Abstract

L'invention concerne un article absorbant chirurgical qui est facilement détectable, et dans lequel une augmentation significative de coût peut être contournée, un dispositif de détection et un procédé de détection. Un article absorbant chirurgical (1) comprend un corps d'article (11) ayant des propriétés absorbantes, et un inducteur électrique (12) fixé sur le corps d'article (11). Un fil fin déformable à la courbure, tel qu'un fil d'argent ou un fil de cuivre, ayant un diamètre de fil d'environ 0,4 à 1,0 mm, peut être utilisé en tant qu'inducteur électrique (12). L'inducteur électrique (12) est situé le long d'un bord (11A) du corps d'article (11) et forme une section annulaire (13) globale. Dans la section annulaire (13), une première extrémité et l'autre extrémité de l'inducteur électrique (12) sont en contact l'une avec l'autre et reliées électriquement.
PCT/JP2015/073001 2014-08-19 2015-08-17 Article absorbant chirurgical, dispositif de détection, et procédé de détection WO2016027756A1 (fr)

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JP2014-166299 2014-08-19
JP2014166299A JP2016041212A (ja) 2014-08-19 2014-08-19 手術用吸収性物品、検出装置および検出方法

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPH10295027A (ja) * 1998-05-15 1998-11-04 Matsushita Electric Works Ltd 配線用樹脂製ボックス
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