JP6865844B2 - Liquid detector - Google Patents

Description

In the present invention, a voltage is applied between the first conductive pattern and the second conductive pattern provided on the surface of the base portion in a state of being insulated from each other, and straddles the first conductive pattern and the second conductive pattern. The present invention relates to a liquid detection device that electrically detects a liquid in contact with the liquid.

As a liquid detection device of this type, Japanese Patent Application Laid-Open No. 2013-142650 states that the planar first conductive portion is connected to the positive electrode of the power supply via a short-circuit detector, and the planar second conductive portion is connected to the negative electrode of the power supply. The one connected to is proposed. In this liquid detection device, the first conductive portion has a plurality of first branch portions extending in a comb shape as a first conductive pattern, and the second conductive portion extends in a comb shape as a second conductive pattern. It has a plurality of second branch portions. Each second branch is arranged between adjacent first branches.

However, Japanese Patent Application Laid-Open No. 2013-142650 does not include a disconnection detection circuit for detecting disconnection of the first branch portion and the second branch portion. Therefore, the disconnection of the first branch portion and the second branch portion cannot be detected. Further, since this liquid detection device has a plurality of first branch portions and second branch portions, it is not easy to detect disconnection of these first branch portions and second branch portions.

The present invention has been made in consideration of such a problem, and the disconnection of the first conductive pattern and the second conductive pattern can be easily and electrically detected, and a small amount of liquid can be detected. It is an object of the present invention to provide a liquid detector.

In order to achieve the above object, the liquid detection device according to the present invention applies a voltage between the first conductive pattern and the second conductive pattern provided on the surface of the base portion in a state of being insulated from each other, and the above-mentioned first. A liquid detection device that electrically detects a conductive liquid that is in contact with the first conductive pattern and the second conductive pattern, and is formed on one end of the linear first conductive pattern and the first conductive pattern. A first conductive portion having a first terminal portion provided and a second terminal portion provided at the other end of the first conductive pattern, a linear second conductive pattern, and a second conductive pattern. A second conductive portion having a third terminal portion provided at one end of the second conductive pattern and a fourth terminal portion provided at the other end of the second conductive pattern, the first terminal portion and the third terminal portion. The terminal portion is configured as a voltage application terminal portion, and the second terminal portion and the fourth terminal portion are configured as a detection terminal portion to which a disconnection detection circuit can be electrically connected, and the first conductive pattern and the terminal portion. Each of the second conductive patterns is provided only on the path obtained by one-stroke writing in a state of being parallel to each other.

According to such a configuration, each of the first conductive pattern and the second conductive pattern is provided only on the path obtained by one-stroke writing. Therefore, the disconnection of the first conductive pattern and the second conductive pattern can be easily electrically detected by the disconnection detection circuit electrically connected to the detection terminal portion. Further, since the first conductive pattern and the second conductive pattern are parallel to each other, a small amount of liquid can be detected.

In the above liquid detection device, at least a part of each of the first conductive pattern and the second conductive pattern may extend in a curved shape.

According to such a configuration, the first conductive pattern and the second conductive pattern can be efficiently arranged on the surface of the base portion.

In the above liquid detection device, the base portion may be formed in a flat plate shape, and each of the first conductive pattern and the second conductive pattern may extend in a spiral shape.

According to such a configuration, the first conductive pattern and the second conductive pattern can be arranged more efficiently on the surface of the base portion.

In the liquid detection device, each of the first terminal portion, the second terminal portion, the third terminal portion, and the fourth terminal portion may be provided on the outer edge portion of the base portion.

According to such a configuration, the power supply can be easily connected to the voltage application terminal portion, and the disconnection detection circuit can be easily connected to the detection terminal portion.

In the above liquid detection device, at least one of the voltage application terminal portion and the detection terminal portion is provided on the back surface of the base portion, and the voltage application terminal portion and the detection are provided on the base portion. A through hole may be formed in the terminal portion for electrically connecting the terminal portion provided on the back surface of the base portion and the first conductive pattern and the second conductive pattern to each other.

According to such a configuration, the configuration of the first conductive portion and the second conductive portion can be simplified.

In the above liquid detection device, the terminal portion provided on the back surface of the base portion extends so as to intersect the first conductive pattern and the second conductive pattern in a plan view of the base portion. May be good.

According to such a configuration, the configurations of the first conductive portion and the second conductive portion can be further simplified.

In the above liquid detection device, voltage detection for detecting the voltage of the electric resistance portion provided on the conducting wire connecting the first conductive portion and the power supply or the conducting wire connecting the second conductive portion and the power supply, and the voltage of the electric resistance portion. A unit and may be further provided.

According to such a configuration, even when the liquid has a relatively high electric conductivity (for example, pure water), the first conductive pattern and the second conductive pattern are obtained by detecting the voltage of the electric resistance portion. Contact of the liquid with the pattern can be easily detected.

In the above liquid detection device, the distance between the adjacent first conductive pattern and the second conductive pattern is larger than the line width of the first conductive pattern and the line width of the second conductive pattern. May be good.

According to such a configuration, it is possible to reliably insulate the first conductive pattern and the second conductive pattern in a state where the liquid is not in contact with the surface of the base portion.

According to the liquid detection device according to the present invention, since the first conductive pattern and the second conductive pattern are provided only on the path obtained by one stroke in a state of being parallel to each other, the first conductive pattern and the second conductive pattern are provided. The disconnection of the conductive pattern can be easily detected electrically and a small amount of liquid can be detected.

It is a perspective view which shows typically the liquid detection apparatus and the inspection object which concerns on one Embodiment of this invention. It is a top view which looked at the base part of FIG. 1 from the surface side. It is a flowchart for demonstrating the liquid detection method using the liquid detection apparatus of FIG. It is sectional drawing which shows the state which set the liquid detection apparatus on the inspection object. It is sectional drawing which shows the state which the liquid adhered to the surface of the base part. It is a vertical cross-sectional view of an artificial lung including an object to be inspected.

Hereinafter, a suitable embodiment of the liquid detection device according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the liquid detection device 10 according to the embodiment of the present invention is a device for detecting the liquid leaked from the inspection object 100. Specifically, the liquid detection device 10 detects the leakage of water (pure water) from the inspection object 100, which is a semi-finished product of the artificial lung 102 (see FIG. 6), and thereby pinholes in the hollow fiber membrane 106a. It is configured as a pinhole detection device for confirming the presence or absence of.

First, the artificial lung 102, which is the final product of the inspection object 100, will be described.

As shown in FIG. 6, the artificial lung 102 is a medical device that temporarily substitutes the function of the lung during an operation such as heart surgery of the human body. The artificial lung 102 is a device for adjusting blood temperature, removing carbon dioxide in blood, and supplying oxygen to blood in extracorporeal blood circulation.

The artificial lung 102 includes a heat exchanger 104, a hollow fiber membrane bundle 106, a housing 108, a gas inflow member 110, and a gas outflow member 112. The heat exchanger 104 is a so-called bellows type heat exchanger, and has a bellows-shaped cylinder 114 and a heat exchanger main body 116 arranged in the cylinder 114. The heat exchanger main body 116 includes a heat medium introduction unit 118 for introducing a heat medium such as water into the cylinder 114, and a heat medium lead-out unit 120 for leading out the heat medium in the cylinder 114.

The hollow fiber membrane bundle 106 is configured so that gas can be exchanged. The hollow fiber membrane bundle 106 is formed by winding the hollow fiber membrane 106a around the outer surface of the tubular body 114 and cutting both ends thereof. That is, each hollow fiber membrane 106a is open on both end faces of the hollow fiber membrane bundle 106 (see FIG. 1). A gap through which blood can flow is formed between the plurality of hollow fiber membranes 106a.

The housing 108 is a tubular member provided on the outer peripheral side of the hollow fiber membrane bundle 106. A gap is provided between the housing 108 and the hollow fiber membrane bundle 106. The opening at one end of the housing 108 is filled with resin 122 to hold the hollow fiber membrane bundle 106 and the tubular body 114. The opening at the other end of the housing 108 is filled with resin 124 to hold the hollow fiber membrane bundle 106 and the tubular body 114. The gap between the housing 108 and the hollow fiber membrane bundle 106 is divided into a first chamber 126 and a second chamber 128 by a partition member (not shown). The housing 108 is provided with a blood inflow section 130 for allowing blood to flow into the first chamber 126 and a blood outflow section 132 for allowing blood to flow out from the second chamber 128.

The gas inflow member 110 is fitted to the other end of the housing 108, and is for introducing gas (oxygen gas) into the lumen of each hollow fiber membrane 106a from the opening on the other end side of each hollow fiber membrane bundle 106. It is a thing. The gas outflow member 112 is fitted to one end of the housing 108 and is for guiding the gas (carbon dioxide) guided from the opening on one end side of each hollow fiber membrane bundle 106 to the outside.

In such an artificial lung 102, oxygen gas is introduced into the gas inflow member 110 and a heat medium is introduced into the heat medium introduction unit 118. The oxygen gas introduced into the gas inflow member 110 is guided to the lumen of each hollow fiber membrane 106a. Further, the heat medium introduced from the heat medium introduction unit 118 is guided into the cylinder 114. On the other hand, the blood guided from the blood inflow portion 130 to the first chamber 126 passes through the hollow fiber membrane bundle 106 (the gap between the plurality of hollow fiber membranes 106a).

At this time, oxygen flowing through the cavity of the hollow fiber membrane 106a is guided into the blood, and carbon dioxide in the blood is guided to the cavity of the hollow fiber membrane 106a. Then, the gas-exchanged blood is guided to the heat exchange space 134 between the hollow fiber membrane bundle 106 and the tubular body 114, and heat is exchanged by the heat exchanger 104. The heat exchanged heat medium is led out from the heat medium lead-out unit 120. The heat-exchanged blood is gas-exchanged again by the hollow fiber membrane bundle 106, and then flows out from the blood outflow portion 132 via the second chamber 128.

As shown in FIGS. 1 and 6, the inspection object 100 of the present embodiment is obtained by omitting the heat exchanger main body 116, the gas inflow member 110, and the gas outflow member 112 from the artificial lung 102 described above.

The liquid detection device 10 applies a voltage between the first conductive pattern 36 and the second conductive pattern 42 provided on the surface 12a of the base portion 12 in a state of being insulated from each other, and applies a voltage to the first conductive pattern 36 and the second conductive pattern 36. The liquid that comes into contact with the pattern 42 is electrically detected.

As shown in FIGS. 1, 2 and 4, the liquid detection device 10 includes a base portion 12, a first conductive portion 14, a second conductive portion 16, a mounting member 18, a power supply 20, a detection unit 22, and a liquid supply device 24. , An air supply device 26 and a control unit 28. In addition, in FIG. 1 and FIG. 2, in order to make it easy to distinguish between the first conductive portion 14 and the second conductive portion 16, the thickness of these lines is changed for convenience.

In FIGS. 1 and 2, the base portion 12 is an insulating substrate configured in a flat plate shape. The base portion 12 has an annular portion 30, a first protruding portion 32 and a second protruding portion 34 protruding radially outward from the outer edge portion of the annular portion 30. Each of the first protruding portion 32 and the second protruding portion 34 is formed in a rectangular shape in a plan view. The second protruding portion 34 is provided at a position shifted by 90 ° in the circumferential direction of the annular portion 30 with respect to the first protruding portion 32.

The first conductive portion 14 and the second conductive portion 16 are provided on the base portion 12 by, for example, an active method or a subactive method. The first conductive portion 14 includes a linear first conductive pattern 36, a first terminal portion 38 provided at one end of the first conductive pattern 36, and a second terminal provided at the other end of the first conductive pattern 36. It has a part 40 and.

The first conductive pattern 36 is provided on the surface 12a (the surface of the annular portion 30) of the base portion 12 and extends in a curved shape. Specifically, the first conductive pattern 36 extends in a spiral shape and is provided only on the path obtained by one-stroke writing. One end (outer end) of the first conductive pattern 36 located on the outermost side in the radial direction is located on the inner side in the radial direction of the first protruding portion 32. The innermost end (inner end) of the first conductive pattern 36 is located inward in the radial direction of the second protruding portion 34.

The first terminal portion 38 is a voltage application terminal portion and is provided on the surface 12a of the base portion 12. The first terminal portion 38 is a first connection line that electrically connects the first terminal main body 38a electrically connected to the positive electrode of the power supply 20, the first terminal main body 38a, and one end of the first conductive pattern 36. Including 38b.

The first terminal body 38a is provided on the surface of the first protruding portion 32. The width dimension of the first terminal body 38a is larger than the width dimension of the first connection wire 38b. The first connecting line 38b extends linearly inward in the radial direction of the annular portion 30 from the first terminal main body 38a. The width dimension of the first connecting wire 38b is the same as the width dimension of the first conductive pattern 36. However, the width dimension of the first connecting wire 38b may be larger than the width dimension of the first conductive pattern 36.

The second terminal portion 40 is a detection terminal portion and is provided on the back surface 12b of the base portion 12. The second terminal unit 40 is a second connection line that electrically connects the second terminal body 40a electrically connected to the detection unit 22, the second terminal body 40a, and the other end of the first conductive pattern 36 to each other. Includes 40b and.

The second terminal body 40a is provided on the back surface of the second protruding portion 34. The width dimension of the second terminal body 40a is larger than the width dimension of the second connection line 40b. The second connecting line 40b extends linearly inward in the radial direction of the annular portion 30 from the second terminal main body 40a. The second connecting line 40b is connected to the other end of the first conductive pattern 36 via the first through hole 41 formed in the annular portion 30. The second connecting line 40b extends so as to intersect the first conductive pattern 36 and the second conductive pattern 42, which will be described later, in a plan view of the base portion 12. The width dimension of the second connecting line 40b is the same as the width dimension of the first conductive pattern 36. However, the width dimension of the second connecting wire 40b may be larger than the width dimension of the first conductive pattern 36.

The second conductive portion 16 is provided on the base portion 12 in the same manner as the first conductive portion 14. The second conductive portion 16 includes a linear second conductive pattern 42, a third terminal portion 44 provided at one end of the second conductive pattern 42, and a fourth terminal provided at the other end of the second conductive pattern 42. It has a part 46.

The second conductive pattern 42 is provided on the surface 12a (the surface of the annular portion 30) of the base portion 12 and extends in a curved shape. Specifically, the second conductive pattern 42 extends in a spiral shape and is provided only on the path obtained by one-stroke writing. The second conductive pattern 42 is located between the radially adjacent portions of the annular portion 30 of the first conductive pattern 36. That is, the first conductive pattern 36 and the second conductive pattern 42 are in parallel with each other. In other words, the first conductive pattern 36 and the second conductive pattern 42 are alternately located in the radial direction of the annular portion 30. One end (outer end) of the second conductive pattern 42 located on the outermost side in the radial direction is located on the inner side in the radial direction of the first protruding portion 32. The other end (inner end) of the second conductive pattern 42, which is located on the innermost side in the radial direction, is located inward in the radial direction of the second protruding portion 34.

The third terminal portion 44 is a voltage application terminal portion and is provided on the surface 12a of the base portion 12. The third terminal portion 44 is a third connection line that electrically connects the third terminal main body 44a electrically connected to the negative electrode of the power supply 20, the third terminal main body 44a, and one end of the second conductive pattern 42. Includes 44b and. The third terminal body 44a is configured in the same manner as the first terminal body 38a. The third connecting line 44b extends linearly inward in the radial direction of the annular portion 30 from the third terminal main body 44a.

The fourth terminal portion 46 is a detection terminal portion and is provided on the back surface 12b of the base portion 12. The fourth terminal unit 46 is a fourth connection line that electrically connects the fourth terminal body 46a electrically connected to the detection unit 22, the fourth terminal body 46a, and the other end of the second conductive pattern 42 to each other. Including 46b. The fourth terminal body 46a is configured in the same manner as the second terminal body 40a. The fourth connecting line 46b extends linearly inward in the radial direction of the annular portion 30 from the fourth terminal main body 46a. The fourth connecting line 46b is connected to the other end of the second conductive pattern 42 via a second through hole 47 formed in the annular portion 30. The fourth connecting line 46b extends so as to intersect the first conductive pattern 36 and the second conductive pattern 42 in a plan view of the base portion 12.

In FIG. 5, the distance D between the adjacent first conductive pattern 36 and the second conductive pattern 42 is larger than the line width W1 of the first conductive pattern 36 and the line width W2 of the second conductive pattern 42, respectively. The separation interval D is preferably set to, for example, 0.2 mm or more and 0.6 mm or less, and more preferably 0.4 mm. When the separation interval D is less than 0.2 mm, the inner diameter (hole diameter) of the hollow fiber membrane 106a used for the artificial lung 102 is about 0.2 mm, so that the water does not leak from the pinhole of the hollow fiber membrane 106a. There is a risk of erroneous detection of minute water droplets. When the separation interval D is 0.6 mm or more, the base portion 12 becomes large and the amount of detectable liquid increases.

In FIGS. 1 and 4, the mounting member 18 is for mounting the base portion 12 on one end surface of the inspection object 100, and has a cylindrical portion 48 and a flange portion 50. The columnar portion 48 is configured to be able to be fitted into the inner hole 114a of the tubular body 114 of the inspection object 100 in a state where the inner hole 30a of the annular portion 30 is inserted. The outer diameter of the flange portion 50 is larger than the diameter of the inner hole 30a of the annular portion 30.

As shown in FIG. 2, the power supply 20 is a DC power supply, the positive electrode is electrically connected to the first terminal body 38a of the first conductive portion 14 via the conducting wire 52, and the negative electrode is connected via the conducting wire 54. 2 It is electrically connected to the third terminal body 44a of the conductive portion 16.

The detection unit 22 includes a first detection conductor 56, a second detection conductor 58, and a disconnection detection circuit 60. The first detection conductor 56 is electrically connected to the second terminal body 40a. The second detection conductor 58 is electrically connected to the fourth terminal body 46a. The disconnection detection circuit 60 is a circuit for detecting disconnection of the first conductive pattern 36 and the second conductive pattern 42, and is electrically connected to the first detection conductor 56 and the second detection conductor 58. The disconnection detection circuit 60 detects the presence or absence of disconnection based on the voltage between the first detection conductor 56 and the second detection conductor 58 or the current flowing through the disconnection detection circuit 60.

The conducting wire 52 is provided with an electric resistance unit 62 and a voltage detecting unit 64. That is, the electric resistance portion 62 is provided in series with the power supply 20 electrically connected to the first conductive portion 14 and the second conductive portion 16. The electric resistance portion 62 has a resistance value larger than the resistance value between the first conductive portion 14 and the second conductive portion 16. The voltage detection unit 64 is a voltmeter that detects the voltage of the electric resistance unit 62.

In FIGS. 1 and 4, the liquid supply device 24 is for filling the housing 108 of the inspection object 100 with a liquid (for example, pure water) and pressurizing it. Specifically, the liquid supply device 24 fills the region where the blood of the test object 100 flows with the liquid, and has a pump 70 and tubes 72a and 72b. The pump 70 discharges the liquid into the tube 72a. The tube 72a can be fitted to the blood inflow portion 130, and the tube 72b can be fitted to the blood outflow portion 132.

The air supply device 26 is for guiding the liquid leaking into the cavity of the hollow fiber membrane 106a of the inspection object 100 to the end face of the inspection object 100. The air supply device 26 can circulate air from the opening on the other end side of the hollow fiber membrane 106a of the inspection object 100 to the opening on the one end side of the hollow fiber membrane 106a through the cavity of the hollow fiber membrane 106a. It is configured so that it can be done. Specifically, the air supply device 26 has a compressor 74 and a supply cylinder portion 76. The compressor 74 supplies compressed air to the supply cylinder portion 76. The supply cylinder portion 76 is formed in an annular shape. The end face of the inspection object 100 can be airtightly arranged on the end face of the supply cylinder portion 76.

The control unit 28 controls the power supply 20, the pump 70, the compressor 74, and the like. Further, the detection signals of the disconnection detection circuit 60 and the voltage detection unit 64 are input to the control unit 28.

Next, a pinhole detection method (liquid detection method) of the inspection object 100 using the liquid detection device 10 configured as described above will be described. The procedure of the following liquid detection method is carried out every time the inspection object 100 is inspected.

First, in step S1 of FIG. 3, a disconnection inspection of the liquid detection device 10 is performed. Specifically, the control unit 28 controls the power supply 20 so that a predetermined voltage is applied between the first conductive pattern 36 and the second conductive pattern 42. At this time, the disconnection detection circuit 60 detects the presence or absence of disconnection of the first conductive pattern 36 and the second conductive pattern 42. That is, when at least one of the first conductive pattern 36 and the second conductive pattern 42 is broken, the disconnection detection circuit 60 is compared with the case where both the first conductive pattern 36 and the second conductive pattern 42 are not broken. Current and voltage change. The disconnection detection circuit 60 disconnects the internal circuit of the disconnection detection circuit 60 after the end of step S1. This method may be a switch type or may be non-contact between wirings.

Then, in step S2, the control unit 28 determines whether or not at least one of the first conductive pattern 36 and the second conductive pattern 42 is broken based on the detection signal of the disconnection detection circuit 60. When the control unit 28 determines that at least one of the first conductive pattern 36 and the second conductive pattern 42 is broken (step S2: YES), in step S3, the user is notified by an alarm or the like. Notify. After that, the current liquid detection method is completed. On the other hand, when the control unit 28 determines that the first conductive pattern 36 and the second conductive pattern 42 are not disconnected (step S2: NO), the process proceeds to the next step. The control unit 28 turns off the power supply 20 when the procedure of step S1 is completed.

Next, in step S4, the inspection object 100, which is a semi-finished product of the artificial lung 102, and the liquid detection device 10 are set. Specifically, one end surface of the inspection object 100 is airtightly arranged on the end surface of the supply cylinder portion 76. Further, the base portion 12 is arranged with respect to the inspection object 100 so that the first conductive pattern 36 and the second conductive pattern 42 come into contact with the other end surface of the hollow fiber membrane bundle 106 of the inspection object 100. Then, the cylindrical portion 48 of the mounting member 18 is fitted into the inner hole 30a of the annular portion 30 and the inner hole 114a of the tubular body 114, and the back surface 12b of the base portion 12 is pressed by the flange portion 50. As a result, the base portion 12 is set coaxially with respect to the inspection object 100 (see FIG. 4).

Then, in step S5, the inspection object 100 is filled with a liquid (for example, pure water) and pressurized. That is, the liquid is supplied from the pump 70 into the housing 108 with the tube 72a attached to the blood inflow portion 130 and the tube 72b attached to the blood outflow portion 132. Then, the heat exchange space 134 is filled with liquid and pressurized between the first chamber 126, the second chamber 128, and the plurality of hollow fiber membranes 106a. At this time, if a pinhole (small hole) is formed in the hollow fiber membrane 106a, the liquid in the housing 108 flows into the cavity of the hollow fiber membrane 106a.

Further, in step S6, air is supplied. That is, the air supply device 26 supplies air (compressed air) from the compressor 74 to the supply cylinder portion 76. Then, the air passes through the opening on one end side of the hollow fiber membrane 106a, the cavity of the hollow fiber membrane 106a, and the opening on the other end side of the hollow fiber membrane 106a, and is between the base portion 12 and the inspection object 100. It flows out through the gap. At this time, if a liquid flows into the cavity of the hollow fiber membrane 106a, the liquid is carried by air to the opening on the other end side of the hollow fiber membrane 106a and adheres to the surface 12a of the base portion 12. In other words, the liquid (water droplet L) comes into contact with each other so as to straddle the first conductive pattern 36 and the second conductive pattern 42 (see FIG. 5).

Then, in step S7, a voltage inspection is performed. Specifically, the control unit 28 controls the power supply 20 so that a predetermined voltage is applied between the first conductive pattern 36 and the second conductive pattern 42. At this time, in a state where the liquid does not adhere to the surface 12a of the base portion 12, the first conductive portion 14 and the second conductive portion 16 are insulated from each other, so that the voltage detection unit 64 uses the voltage value of the power supply 20. It detects only a voltage of noise level that does not reach far.

On the other hand, when the liquid comes into contact with the first conductive pattern 36 and the second conductive pattern 42 so as to straddle the first conductive pattern 36, the first conductive portion 14 and the second conductive portion 16 conduct with each other via the liquid. Therefore, the voltage detection unit 64 detects the voltage value corresponding to the resistance value of the electric resistance unit 62.

Then, in step S8, the control unit 28 determines whether or not the liquid has adhered to the surface 12a of the base unit 12 based on the detection signal (voltage value) of the voltage detection unit 64. When the control unit 28 determines that no liquid has adhered to the surface 12a of the base unit 12 (step S8: NO), the current liquid detection method ends.

On the other hand, when the control unit 28 determines that the liquid is attached to the surface 12a of the base unit 12 (step S8: YES), in step S9, a notification to that effect is given by an alarm or the like. Then, in step S10, the liquid adhering to the surface 12a of the base portion 12 is removed by air blowing. At this time, the liquid on the surface 12a of the base portion 12 may be vaporized by heat, or the liquid on the surface 12a of the base portion 12 may be wiped off by a liquid absorbing member such as a cloth. After that, the current liquid detection method is completed.

In this case, the liquid detection device 10 according to the present embodiment has the following effects.

Each of the first conductive pattern 36 and the second conductive pattern 42 is provided only on the path obtained by one-stroke writing. Therefore, the disconnection of the first conductive pattern 36 and the second conductive pattern 42 can be detected by the disconnection detection circuit 60 electrically connected to the detection terminal portions (second terminal portion 40 and fourth terminal portion 46). it can. Further, since the first conductive pattern 36 and the second conductive pattern 42 are arranged in parallel with each other, a small amount of liquid can be detected.

The distance D between the adjacent first conductive pattern 36 and the second conductive pattern 42 is larger than the line width W1 of the first conductive pattern 36 and the line width W2 of the second conductive pattern 42, respectively. Therefore, the first conductive pattern 36 and the second conductive pattern 42 can be reliably insulated from each other in a state where the liquid is not in contact with the surface 12a of the base portion 12.

The base portion 12 is formed in a flat plate shape, and each of the first conductive pattern 36 and the second conductive pattern 42 extends in a spiral shape (curved shape). As a result, the first conductive pattern 36 and the second conductive pattern 42 can be efficiently arranged on the surface 12a of the base portion 12.

Each of the first terminal portion 38, the second terminal portion 40, the third terminal portion 44, and the fourth terminal portion 46 is provided on the outer edge portion of the base portion 12. Therefore, the power supply 20 can be easily connected to the voltage application terminal portion (first terminal portion 38 and the third terminal portion 44), and to the detection terminal portion (second terminal portion 40 and fourth terminal portion 46). The disconnection detection circuit 60 can be easily connected.

The first terminal portion 38 and the third terminal portion 44 are provided on the front surface 12a of the base portion 12, and the second terminal portion 40 and the fourth terminal portion 46 are provided on the back surface 12b of the base portion 12. In the base portion 12, the first through hole 41 for electrically connecting the second terminal portion 40 and the first conductive pattern 36 to each other, and the fourth terminal portion 46 and the first conductive pattern 36 are electrically connected to each other. A second through hole 47 for connecting to is formed. As a result, the configurations of the first conductive portion 14 and the second conductive portion 16 can be simplified.

The second connecting line 40b of the second terminal portion 40 and the fourth connecting line 46b of the fourth terminal portion 46 intersect the first conductive pattern 36 and the second conductive pattern 42 in the plan view of the base portion 12. It is postponed. As a result, the configurations of the first conductive portion 14 and the second conductive portion 16 can be further simplified.

The liquid detection device 10 includes an electric resistance unit 62 provided in a conducting wire 52 connecting the first conductive unit 14 and the power supply 20, and a voltage detecting unit 64 for detecting the voltage of the electric resistance unit 62. As a result, even when the liquid has a relatively high electric conductivity (for example, pure water), the first conductive pattern 36 and the second conductive pattern 42 can be obtained by detecting the voltage of the electric resistance portion 62. It is possible to easily detect whether or not the liquid has come into contact with the liquid so as to straddle.

The present invention is not limited to the above-described configuration. In the liquid detection device 10, each of the first terminal portion 38 and the third terminal portion 44 is configured as a detection terminal portion, and each of the second terminal portion 40 and the fourth terminal portion 46 is configured as a voltage application terminal portion. You may. In this case, the voltage application terminal portion is provided on the back surface 12b of the base portion 12, and the detection terminal portion is provided on the front surface 12a of the base portion 12. Further, each of the voltage application terminal portion and the detection terminal portion may be provided on the back surface 12b of the base portion 12.

The first conductive pattern 36 may extend at least in a curved shape by including at least a curved portion (a portion that is not a straight line). That is, the first conductive pattern 36 may be formed, for example, by bending a straight line at a right angle, an obtuse angle, or an acute angle. The same applies to the second conductive pattern 42. Further, each of the first conductive pattern 36 and the second conductive pattern 42 may extend in a straight line as a whole.

Each of the first conductive pattern 36 and the second conductive pattern 42 is not limited to those provided in a plane on the surface 12a of the flat plate-shaped base portion 12, and for example, three-dimensionally on the surface of the block-shaped base portion. It may be provided. Further, the base portion 12 may be an elastic body such as rubber. The electric resistance portion 62 may be provided not on the conducting wire 52 but on the conducting wire 54 connecting the second conductive portion 16 and the power supply 20.

The liquid supplied by the liquid supply device 24 to the inspection object 100 is not limited to pure water, and any conductive liquid can be used. The test object 100 is not limited to the semi-finished product of the artificial lung 102.

Of course, the liquid detection device according to the present invention is not limited to the above-described embodiment, and can adopt various configurations without deviating from the gist of the present invention.

Claims (6)

A voltage is applied between the first conductive pattern (36) and the second conductive pattern (42) provided on the surface (12a) of the base portion (12) in a state of being insulated from each other, and the first conductive pattern (36) is applied. ) And the second conductive pattern (42), which is a liquid detection device (10) that electrically detects the conductive liquid in contact with the second conductive pattern (42).
The linear first conductive pattern (36), the first terminal portion (38) provided at one end of the first conductive pattern (36), and the other end of the first conductive pattern (36) are provided. A first conductive portion (14) having a second terminal portion (40), and a second conductive portion (14).
The linear second conductive pattern (42), the third terminal portion (44) provided at one end of the second conductive pattern (42), and the other end of the second conductive pattern (42) are provided. The fourth terminal portion (46) and the second conductive portion (16) having the fourth terminal portion (46) are provided.
The first terminal portion (38) and the third terminal portion (44) are configured as voltage application terminal portions.
The second terminal portion (40) and the fourth terminal portion (46) are configured as detection terminal portions to which the disconnection detection circuit (60) can be electrically connected.
Wherein each of said first conductive pattern (36) a second conductive pattern (42) is provided only on a path obtained by a single stroke in a state in parallel with each other,
The base portion (12) is formed in a flat plate shape.
Each of the first conductive pattern (36) and the second conductive pattern (42) extends in a spiral shape.
The base portion (12) has an annular portion (30) provided with an inner hole (30a) in the central portion and the annular portion (30) protruding outward in the radial direction from the outer edge portion of the annular portion (30). It has a first protruding portion (32) and a second protruding portion (34) provided at different positions in the circumferential direction of the portion (30).
The spiral first conductive pattern (36) and the second conductive pattern (42) are arranged in the annular portion (30) so as to surround the inner hole (30a).
The first terminal portion (38) and the third terminal portion (44) are arranged in the first protruding portion (32).
The second terminal portion (40) and the fourth terminal portion (46) are arranged in the second protruding portion (34).
A liquid detection device (10). In the liquid detection device (10) according to claim 1,
A mounting member (18) for mounting the base portion (12) is provided on one end surface of the tubular body (114) of the inspection object (100).
The mounting member (18)
A cylindrical portion (48) that can be inserted into the inner hole (30a) of the annular portion (30) and the inner hole (114a) opened at the one end surface of the tubular body (114).
A flange portion (50) having an outer diameter larger than the diameter of the cylindrical portion (48), the diameter of the inner hole (30a) of the annular portion (30), and the diameter of the inner hole (114a) of the tubular body. And have,
A liquid detection device (10). In the liquid detection device (10) according to claim 1 or 2.
At least one of the voltage application terminal portion and the detection terminal portion is provided on the back surface (12b) of the base portion (12).
The base portion (12) includes terminal portions (40, 46) provided on the back surface (12b) of the base portion (12) among the voltage application terminal portion and the detection terminal portion, and the first conductive portion. Through holes (41, 47) for electrically connecting the pattern (36) and the second conductive pattern (42) to each other are formed.
A liquid detection device (10). In the liquid detection device (10) according to claim 3.
The terminal portions (40, 46) provided on the back surface (12b) of the base portion (12) have the first conductive pattern (36) and the second conductive pattern (36) in a plan view of the base portion (12). It extends to intersect with 42),
A liquid detection device (10). The liquid detection device (10) according to any one of claims 1 to 4.
An electric resistance portion (62) provided on a conducting wire connecting the first conductive portion (14) and the power supply (20) or a conducting wire connecting the second conductive portion (16) and the power supply (20).
A voltage detection unit (64) for detecting the voltage of the electric resistance unit (62) is further provided.
A liquid detection device (10). In the liquid detection device (10) according to any one of claims 1 to 5.
The distance (D) between the adjacent first conductive pattern (36) and the second conductive pattern (42) is the line width (W1) of the first conductive pattern (36) and the second conductive pattern (42). ) Is larger than each of the line widths (W2),
A liquid detection device (10).

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