JP6739144B2 - Antistatic tool - Google Patents

Description

The present invention relates to an antistatic device which is attached to a flow path through which a liquid can flow and which can dissipate an electric charge carried on the liquid in the flow path.

In general, a blood purification apparatus for performing dialysis treatment is for purifying blood that circulates extracorporeally in an arterial blood circuit and a venous blood circuit that form a blood circuit for extracorporeally circulating a patient's blood. Blood purifier, and a device main body in which various treatment means such as a blood pump and a blood pump for performing blood purification treatment by the blood purifier are provided. An arterial puncture needle and a venous puncture needle can be attached to the tips of the arterial blood circuit and the venous blood circuit, respectively.

Then, after puncturing the patient with the arterial-side puncture needle and the venous-side puncture needle, by driving the blood pump, the patient's patient will flow through the arterial-side blood circuit and the venous-side blood circuit. Blood is purified by a purifier. Further, in dialysis treatment, a dialysate introducing tube for introducing dialysate into the blood purifier and a dialysate outlet tube for leading dialysate from the blood purifier are respectively connected to the blood purifier. ..

By the way, as a blood pump or a pump for introducing or drawing out a dialysate into a blood purifier, an ironing type pump which is capable of delivering liquid by rotating rollers to squeeze in a fluid flow direction is usually used. In such an ironing type pump, liquid is squeezed and delivered through the flow passage by the rotating roller, so that static electricity is generated in the squeezing portion, and the liquid in the flow passage is easily charged.

Then, if the liquid is charged during the treatment, the charged blood may reach the patient through, for example, a puncture needle, which may adversely affect the patient's electrocardiogram obtained during the treatment. .. In order to avoid such inconveniences, it has been conventionally proposed to attach an antistatic tool to a liquid flow path and electrically ground it (earth) to avoid an adverse effect on an electrocardiogram or the like.

BACKGROUND ART A conventional antistatic device is, for example, as disclosed in Patent Document 1, a conductive material that connects a distal end of one flexible tube through which a dialysate can flow and a proximal end of another flexible tube. The flexible tube is made of a member (tube joint) and comes into contact with the grounding means (earthing means) attached to the blood purification device side while being in contact with the dialysate flowing through the connecting part of these flexible tubes. It was supposed that the generated charges could be dissipated to the outside.

Japanese Patent No. 4597971

However, in the above-mentioned conventional antistatic tool, since it is composed of a conductive member that connects the distal end of one flexible tube and the proximal end of the other flexible tube, it is not suitable for any flexible tube. When a large force is applied, there is a risk that the connection part may come off, and there is a high possibility that the liquid (dialysis solution or the like) flowing through the flexible tube will leak to the outside from the connection part. It is to be noted that such a problem may similarly occur in a blood circuit that allows blood to flow during treatment and other channels that allow various fluids to flow.

The present invention has been made in view of the above circumstances, and it is possible to satisfactorily and reliably dissipate the charge borne by the liquid in the flow channel to the outside and to prevent the flow channel from coming off while preventing liquid leakage. An object is to provide an antistatic tool that can be suppressed.

The invention according to claim 1 is attached to a flow path formed of a flexible tube through which a dialysate can flow, and a predetermined portion thereof can be brought into contact with the dialysate and is in contact with a grounding means for electrically grounding. in dissipation possible antistatic protector charges charged in the dialysate of the flow path to the outside by, allows liquid contact with the dialysis fluid and is inserted in a press-fit state insertion hole composed of an opening formed in the flow path A conductive member integrally formed with a protrusive liquid contacting portion and a grounding portion capable of contacting with the grounding means to be grounded and capable of dissipating an electric charge carried by the dialysate in the flow path to the outside. Along with the conductive member, a through hole having an inner peripheral surface that is bonded to the outer peripheral surface of the flow channel is formed by inserting the flexible tube that forms the flow channel, and the tip of the liquid contact portion is It is characterized in that it has a continuous shape with respect to the inner peripheral surface of the flexible tube forming the flow path .

According to a second aspect of the invention, the antistatic device of claim 1 Symbol placement, the flow path, squeezing pump which roller the flow direction of dialysate capable of feeding by squeezing the rotating flow path arrangement It is characterized by being set up.

According to a third aspect of the present invention, in the antistatic device according to the first or second aspect , the liquid contacting portion has a large-diameter portion that has a larger diameter than the insertion hole of the flow path at its projecting end. It is characterized in that the large diameter portion can contact the liquid.

According to a fourth aspect of the present invention, in the antistatic tool according to any one of the first to third aspects, the contact portion of the grounding portion with the grounding means is a substantially flat surface. ..

A fifth aspect of the present invention is a medical circuit including the antistatic device according to any one of the first to fourth aspects.

The invention according to claim 6 is a blood purification apparatus comprising the antistatic device according to any one of claims 1 to 4 .

According to the first aspect of the present invention, the protrusion-shaped liquid contact portion which is inserted into the insertion hole formed by the opening formed in the flow path in a press-fitted state and can come into contact with the dialysate , and the grounding means can be grounded. Since it has a conductive member integrally formed with a grounding part capable of dissipating the charge carried by the dialysate in the flow path to the outside, it dissipates the charge carried by the dialysate in the flow path to the outside satisfactorily and reliably. In addition, it is possible to prevent the flow path from coming off at the mounting portion of the conductive member and to suppress the liquid leakage .

According to the second aspect of the present invention, the flow passage is provided with the ironing pump capable of sending the liquid by squeezing the flow passage by squeezing the flow passage of the dialysate . Due to the rotation, the charge carried on the dialysate in the channel can be satisfactorily and reliably dissipated to the outside.

According to the invention of claim 3, the liquid contact part has a large diameter part larger in diameter than the insertion hole of the flow path at the projecting end thereof, and the large diameter part can contact the liquid, so that the conductive property Even if the conductivity of the conductive member is low, the charge carried on the dialysate in the flow channel can be satisfactorily and reliably dissipated to the outside.

According to the invention of claim 4 , since the contact portion of the grounding portion with the grounding means is formed of a substantially flat surface, the contact between the grounding portion and the grounding means can be reliably performed as surface contact, and the flow path It is possible to better and surely dissipate the charge carried by the dialysate to the outside.

According to the invention of claim 5 , it is possible to provide a medical circuit having the effects of the inventions of claims 1 to 4 .

According to the invention of claim 6 , it is possible to provide a blood purification apparatus having the effects of the inventions of claims 1 to 4 .

Schematic diagram showing a blood purification device to which an antistatic device according to an embodiment of the present invention is applied A front view and a side view showing a dialysis machine main body to which the antistatic device is applied. The top view which shows the same dialysis machine main body Schematic diagram showing a blood pump arranged in the same dialysis machine body 3 side view which shows the antistatic tool which concerns on the 1st Embodiment of this invention VI-VI line sectional view in FIG. Two-sided view showing a state in which the antistatic device is attached to the flow path VIII-VIII line sectional view in FIG. IX-IX line sectional view in FIG. Perspective view of a longitudinal section of the antistatic device according to the first embodiment attached to a flow path. 3 side view which shows the antistatic tool which concerns on the 2nd Embodiment of this invention XII-XII line sectional drawing in FIG. Two-sided view showing a state in which the antistatic device is attached to the flow path XIV-XIV sectional view taken on the line in FIG. The perspective view which carried out the longitudinal section of the antistatic tool which concerns on 2nd Embodiment attached to the flow path. The perspective view which shows the antistatic tool which concerns on the 3rd Embodiment of this invention, and the pressure monitor chamber in which the said antistatic tool was formed. 2 side view showing the same pressure monitor chamber Schematic diagram showing a state in which the antistatic tool is in contact with the grounding means XIX-XIX sectional view taken on the line in FIG. Schematic diagram showing the same pressure monitor chamber (with the conductive member removed) Sectional view taken along line XXI-XXI in FIG. 3 side view which shows the electroconductive member in the antistatic tool 22 is a sectional view taken along line XXIII-XXIII in FIG.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The antistatic device according to the present embodiment is attached to a flow path through which a liquid can flow, and is capable of dissipating an electric charge carried on the liquid in the flow path, and is applied to the blood purification apparatus shown in FIG. It is a thing. As shown in FIGS. 1 to 3, such a blood purifying apparatus is applied to a dialysis apparatus for purifying blood of a patient while circulating it extracorporeally, and includes a blood circuit 1, a dialyzer 2 as a blood purifier, and A dialysis machine main body A having a monitor M (see FIGS. 2 and 3) is provided.

The dialyzer 2 is configured by accommodating a plurality of hollow fibers having micropores (pores) in a housing, and the housing has a blood introduction port 2a, a blood discharge port 2b, and a dialysate introduction port. 2c and a dialysate outlet port 2d are formed. Further, the blood circuit 1 is flexible, having an arterial blood circuit 1a to which an arterial puncture needle can be attached at the tip and a vein side blood circuit 1b to which a venous puncture needle can be attached at the tip. It is composed of a tube, and the base end of the arterial blood circuit 1a is connected to the blood introduction port 2a of the dialyzer 2 and the base end of the venous blood circuit 1b is connected to the blood discharge port 2b of the dialyzer 2. There is.

Further, a dialysate introducing tube L1 for introducing dialysate into the dialyzer 2 and a dialysate outlet tube L2 for leading out dialysate (drainage) from the dialyzer 2 can be attached to the dialyzer. The tip of the fluid introduction tube L1 is connected to the dialysate introduction port 2c of the dialyzer 2, and the tip of the dialysate outlet tube L2 is connected to the dialysate outlet port 2d of the dialyzer 2. Further, in the present embodiment, a replacement fluid introduction tube L3 that connects the dialysate introduction tube L1 and the venous blood circuit 1b is formed. The arterial blood circuit 1a and the venous blood circuit 1b, the dialysate introducing tube L1, the dialysate introducing tube L2, and the replacement fluid introducing tube L3 that form the blood circuit 1 are all flexible tubes through which liquid can flow. It consists of

Furthermore, a blood pump P1 is arranged in the middle of the arterial blood circuit 1a. The blood pump P1 is arranged in a portion (see FIG. 3) to which the case C is attached, and as shown in FIG. 4, the rotor R that rotates within the inner peripheral surface Sa of the stator S and the rotor R The rotor R rotates in the liquid flow direction and the flexible tube D1 for wiping is connected to the arterial blood circuit 1a. Each of them consists of an ironing type pump that can deliver liquid by squeezing.

In addition, as shown in FIGS. 1 and 3, the flexible tube D2 for ironing is connected in the middle of the dialysate introduction tube L1, and the flexible tube D3 for ironing is in the middle of the replacement fluid introduction tube L3. And attached to the ironing pumps P2 and P3 arranged in the dialysis machine. Further, the flexible tube D4 for ironing is connected in the middle of the dialysate outlet tube L2 and is attached to the ironing pump P4 arranged in the dialysis machine. In addition, the flexible tube D5 for ironing is attached to the ironing pump P5, and discharges the liquid accumulated in the storage bag B2 by driving after the weight is measured by the weight scale 4.

Like the blood pump P1, the ironing pumps P2 to P5 are arranged in a portion to which the case C is attached (see FIG. 3), and are formed on the rotor that rotates within the inner peripheral surface of the stator and the rotor. A pair of rollers is provided, and the rotor rotates in the liquid flow direction and the pair of rollers squeeze the flexible tubes for wiping (D2 to D5) connected to the flow path. It is possible to transfer liquid. The specific configurations of the ironing pumps P2 to P5 are the same as those of the blood pump P1, and thus detailed description thereof will be omitted.

As described above, the blood pump P1 and the ironing pumps (P2 to P5) are arranged in the dialysis machine, and the case C has the flexible tube for ironing in which each flow path is connected. (D1 to D5) are formed, and when the case C is attached to the dialysis device, the flexible tube D1 for ironing is set to the blood pump P1 and the flexible tube for ironing is also provided. (D2 to D5) are set to the ironing pumps P2 to P5, respectively.

Then, the case C is fitted and attached to the site (stator) where the blood pump P1 and the ironing pumps P2 to P5 are provided in the dialysis device (see FIGS. 2 and 3), and the cover H is closed. The flexible tubes for ironing (D1 to D5) are collectively attached to the blood pump P1 and the ironing pumps (P2 to P5). When the blood pump P1 (blood pump) is driven after the patient is punctured with the arterial puncture needle and the venous puncture needle, the patient's blood can be extracorporeally circulated in the arterial blood circuit 1a and the venous blood circuit 1b. It is like this.

On the other hand, a storage bag B1 that stores the dialysate to be supplied to the dialyzer 2 is connected to the proximal end of the dialysate introduction tube L1, and the dialyzer 2 is discharged to the proximal end of the dialysate outlet tube L2. A storage bag B2 for storing the dialysate (drainage) is connected. A heating bag (not shown) for heating the dialysate is connected in the middle of the dialysate introduction tube L1, and the accommodation bag B2 can be fed by the ironing pump P5. A flexible tube (not shown) is connected.

Then, when the ironing pump P2 is driven, the dialysate in the storage bag B1 flows toward the dialyzer 2, and when the ironing pump P4 is driven, the dialysate (drainage) in the dialyzer 2 moves toward the storage bag B2. It will flow. The accommodation bags B1 and B2 are configured to be hooked on the hooks F formed on the dialysis device, respectively, and to be weighed in real time by the weight scales 3 and 4. As a result, the dialysate can be supplied to the dialyzer 2 at the set flow rate, and the dialysate can be discharged from the dialyzer 2.

In this embodiment, the flexible tube D3 for ironing and wiping is connected to the replacement fluid introduction tube L3 branched from the dialysate introduction tube L1, and the flexible tube D3 for ironing and wiping is connected to the ironing pump P3. It is installed. Then, by driving the ironing type pumps P2 and P3, the dialysate in the accommodation bag B1 can be supplied to the venous blood circuit 1b for replacement. The tip of the replacement fluid introduction tube L3 may be connected to the arterial blood circuit 1a, and the dialysate may be supplied to the arterial blood circuit 1a for replacement.

Here, when the blood pump P1 and the ironing pumps P2 to P5 are driven, the rollers squeeze the flexible tubes for ironing (D1 to D5) one by one, so that the ironing causes static electricity in the flow path. Therefore, in the present embodiment, in order to dissipate (ground) the charge associated with the charging to the outside, an antistatic device is provided in the middle of the dialysate outlet tube L2 (between the dialyzer 2 and the iron pump P4). 5 is connected.

The antistatic device 5 according to the first embodiment is attached to a flow path (dialysate outlet tube L2) through which a dialysate (conductive liquid) can flow, and a predetermined portion can be brought into contact with the dialysate. At the same time, it is possible to dissipate the electric charge carried in the liquid in the flow path to the outside by contacting with a grounding means (earthing means) for electrically grounding. As shown in FIGS. It is composed of a conductive member 6.

More specifically, the antistatic tool 5 according to the present embodiment is made of a conductive material such as polycarbonate containing carbon nanotubes or polyvinyl chloride containing carbon black, which is easily bonded and heat-welded to a flexible tube. It is obtained by injection molding or the like, and is configured to have a conductive member 6 in which a through hole 6a, a liquid contact portion 6b, and a grounding portion 6c are integrally formed. The conductive member 6 preferably has a surface resistance of about 10 ² to 10 ¹² Ω. Further, the grounding portion 6c according to this embodiment is formed in a substantially cylindrical shape, but may have another shape such as a substantially flat shape.

The through hole 6a is a hole formed by extending the center of the conductive member 6 in the longitudinal direction, and its inner diameter is set to be substantially equal to the outer diameter of the flow path (dialysis fluid outlet tube L2) to which the through hole 6a is attached. At a predetermined position on the peripheral surface, a liquid contact portion 6b formed in a protrusion shape is formed. The liquid contact part 6b is a part that is inserted into an insertion hole L2a formed at a predetermined position of the dialysate outlet tube L2 and is capable of contacting the dialysate (a liquid flowing through the dialysate outlet tube L2).

The insertion hole L2a is formed in the middle of the dialysate outlet tube L2, and is composed of a circular opening that faces the liquid flow path to the outside. The outer diameter of the liquid contact part 6b is set to be slightly larger than the inner diameter of the insertion hole L2a. The liquid contact part 6b is press-fitted into the insertion hole L2a while the inner peripheral surface of the through hole 6a and the dialysate outlet tube L2. The conductive member 6 is attached to the dialysate outlet tube L2 by being bonded to the outer peripheral surface of the. The opening shape of the insertion hole L2a and the cross-sectional shape of the liquid contact portion 6b are not limited to circular shapes, and may be, for example, elliptical shapes or rectangular shapes.

In this way, by placing the conductive member 6 in the dialysate outlet tube L2 while inserting the liquid contact portion 6b into the insertion hole L2, the tip of the liquid contact portion 6b is dialyzed as shown in FIG. It can be exposed to the inside of the liquid outlet tube L2, and will come into contact with the liquid flowing through the dialysate outlet tube L2 (the drainage liquid containing the dialysate). Since the liquid contact portion 6b is press-fitted into the insertion hole L2 and the inner peripheral surface of the through hole 6a and the outer peripheral surface of the dialysate outlet tube L2 are adhered to each other, the liquid flowing through the dialysate outlet tube L2. Can be prevented from leaking to the outside through the insertion hole L2a.

The grounding portion 6c is formed of a part of the outer peripheral surface of the conductive member 6, and can be grounded by contacting the grounding means E (see FIG. 2) attached to the cover H, and is connected to the dialysate outlet tube L2 and it. It is possible to dissipate the charge carried in the liquid in the flow path to the outside. The grounding means E according to the present embodiment is formed on the cover H attached to the present dialysis apparatus, and when the cover H is closed, the grounding portion 6c which is a part of the outer peripheral surface of the conductive member 6 and It is configured so that it can be grounded by making contact.

That is, by closing the cover H, the flexible tubes for ironing (D1 to D5) are collectively attached to the blood pump P1 and the ironing pumps (P2 to P5), and the grounding means E is set to the conductive member 6. Since it comes into contact with the grounding portion 6c, the charge carried on the dialysate outlet tube L2 and the liquid in the flow path connected thereto can be diffused to the outside. As a result, the work of attaching the flexible tubes (D1 to D5) for ironing to the blood pump P1 and the ironing pumps (P2 to P5) and the grounding work of the dialysate outlet tube L2 and the flow path connected thereto are performed. It can be performed at the same time, and the workability can be improved.

In the above embodiment, the antistatic tool 5 is attached in the middle of the dialysate outlet tube L2, but other flow paths (arterial blood circuit 1a, vein blood circuit 1b, dialysate inlet tube L1, You may make it attach in the middle of the replacement fluid introduction tube L3 etc.). However, the mounting position of the antistatic tool 5 is between the positions where the blood pump P1 and the ironing pump (P2 to P5) are arranged in order to efficiently dissipate the charges generated by static electricity to the outside. Is preferred. Further, it is necessary to form an insertion hole, such as the insertion hole L2a, into which the liquid contact portion 6b can be inserted, at the attachment position of the antistatic tool 5.

According to the present embodiment, the liquid contact portion 6b which is inserted into the insertion hole L2a formed in the dialysate outlet tube L2 and is capable of coming into contact with the liquid, and the grounding means E are in contact with each other so that they can be grounded. Since the conductive member 6 is integrally formed with the grounding portion 6c capable of dissipating the charge carried in the liquid to the outside, the charge carried in the liquid in the flow path can be dissipated to the outside satisfactorily and reliably, and the conductivity can be improved. It is possible to prevent liquid leakage while preventing the flow path from coming off at the attachment portion of the member 6.

Further, the flow passage to which the conductive member 6 is attached is made of a flexible tube, and the squeezing type pump P2 that can feed the liquid by squeezing the flow passage by squeezing the flow passage by arranging the roller in the liquid flow direction is arranged. Therefore, it is possible to satisfactorily and surely dissipate the charge carried on the liquid in the flow path to the outside by the rotation of the roller of the ironing pump P2. As a result, it is possible to suppress adverse effects such as noise entering the patient's electrocardiogram obtained in parallel during treatment.

Next, a second embodiment according to the present invention will be described.
As in the first embodiment, the antistatic device according to the present embodiment is attached to a flow path (dialysate outlet tube L2) through which a dialysate (conductive liquid) can flow, and a predetermined portion contacts the dialysate. It is liquid-capable and can dissipate the electric charge carried in the liquid in the flow path to the outside by contacting with a grounding means (earthing means) for electrically grounding. As shown in FIGS. The conductive member 7 has a half-divided shape.

More specifically, the antistatic device according to the present embodiment is formed of a conductive material that is easily bonded and heat-welded with a flexible tube, such as polycarbonate containing carbon nanotubes or polyvinyl chloride containing carbon black. It is obtained by doing so, and is configured to have a conductive member 7 in which an inner peripheral surface 7a, a liquid contact portion 7b, and a grounding portion 7c are integrally formed. The conductive member 7 preferably has a surface resistance of about 10 ² to 10 ¹² Ω, as in the first embodiment.

The inner peripheral surface 7a is formed of an arcuate surface, has a shape that follows the outer peripheral surface of the flow path (dialysis fluid outlet tube L2) to be mounted, and has a protrusion-shaped liquid contact portion at a predetermined position. 7b is formed. The liquid contact portion 7b is a portion that is inserted into an insertion hole L2a formed at a predetermined position of the dialysate outlet tube L2 and is capable of contacting the dialysate (a liquid flowing through the dialysate outlet tube L2). In particular, the liquid contact part 7b according to the present embodiment has a large diameter part 7ba larger in diameter than the insertion hole L2a at the projecting end thereof, and the large diameter part 7ba is capable of contacting liquid.

The outer diameter of the liquid contact portion 7b other than the large diameter portion 7ba is substantially the same as the inner diameter of the insertion hole L2a, and the conductive member 7 should be molded at the same time when the dialysate outlet tube L2 is molded. Thus, as shown in FIG. 15, the portion of the liquid contact portion 7b other than the large diameter portion 7ba is located inside the insertion hole L2a, and the large diameter portion 7ba is located on the inner peripheral surface of the dialysate outlet tube L2. Meanwhile, the grounding portion 7c is located on the outer peripheral surface of the dialysate outlet tube L2, and the conductive member 7 is formed.

The grounding portion 7c is made up of a part of the outer peripheral surface of the conductive member 7, is brought into contact with the grounding means E (see FIG. 2) attached to the cover H to be groundable, and is connected to the dialysate outlet tube L2 and it. It is possible to dissipate the charge carried in the liquid in the flow path to the outside. That is, similar to the first embodiment, by closing the cover H, the flexible tubes for ironing (D1 to D5) are collectively attached to the blood pump P1 and the ironing pump (P2 to P5), and Since the grounding means E comes into contact with the grounding portion 7c of the conductive member 7, it is possible to dissipate the charge carried on the dialysate outlet tube L2 and the liquid in the flow path connected thereto to the outside.

According to the present embodiment, the liquid contact part 7b has a large diameter part 7ba that is larger in diameter than the insertion hole L2a of the flow path (dialysis fluid outlet tube L2) at the tip thereof, and the large diameter part 7ba Since liquid contact is possible, even if the conductivity of a conductive member made of, for example, a general-purpose metal is low, it is possible to satisfactorily and reliably dissipate the charge carried by the liquid in the flow path to the outside. In addition, the flow passage to which the conductive member 7 is attached is made of a flexible tube, and the squeezing pump P2 that can feed the liquid by squeezing the flow passage by rotating the roller in the liquid flow direction is arranged. Therefore, it is possible to satisfactorily and surely dissipate the charge carried on the liquid in the flow path to the outside by the rotation of the roller of the ironing pump P2. As a result, it is possible to suppress adverse effects such as noise entering the patient's electrocardiogram obtained in parallel during treatment.

Next, a third embodiment according to the present invention will be described.
As in the first and second embodiments, the antistatic device according to the present embodiment is attached to a flow path (dialysate outlet tube L2) through which a dialysate (conductive liquid) can flow, and a predetermined portion is a dialysate. It is capable of coming into contact with the liquid and is capable of dissipating the electric charge carried by the liquid in the flow path to the outside by contacting with a grounding means (earthing means) for electrically grounding. As shown in FIGS. A fixing portion which has a connecting portion 8b made of an insulating member (for example, a resin or the like) capable of connecting the end portion of the dialysate outlet tube L2, and the connecting portion 8b can be positioned and fixed by matching the conductive member 9. The portion 8ba is formed. The conductive member 9 and its peripheral components are not limited to the liquid inflow side into the pressure monitor chamber 8, but may be installed on the outflow side.

The connecting portion 8b is composed of an outlet port formed in the pressure monitor chamber 8 (arbitrary component) connected to the dialysate outlet tube L2. The pressure monitor chamber 8 is formed with an inlet 8a for letting a liquid into the chamber 8c and an outlet 8b for letting out a liquid in the chamber 8c. The inside of the chamber 8c is formed. As shown in FIG. 19, a liquid chamber S1 communicating with the inlet 8a and the connecting portion 8b, an air chamber S2 communicating with a hydraulic pressure sensor (not shown) via the connecting port 8e, and the liquid chamber S1 It has a diaphragm 8d that defines the chamber S2.

Then, when the liquid flowing through the dialysate outlet tube L2 reaches the pressure monitor chamber 8 and then flows from the inflow port 8a toward the connecting portion 8b, the pressure in the air chamber S2 becomes equal to the pressure in the liquid chamber S1. The diaphragm 8d is deformed to change the capacity of the air chamber S2. At this time, the pressure of the liquid in the liquid chamber S1 (that is, the liquid pressure in the dialysate outlet tube L2) can be detected by measuring the pressure in the air chamber S2 with a liquid pressure sensor (not shown). ..

The connecting portion 8b and the inflow port 8a are each formed of a port-shaped portion integrally formed to project from the chamber portion 8c, and the end portion of the dialysate outlet tube L2 is connected to the connecting portion 8b and a part of the connecting portion 8b is cut away. A fixing portion 8ba that allows the conductive member 9 to be aligned and positioned and fixed is formed. That is, the fixing portion 8ba is formed with the receiving surface 8bb, and the lower surface of the conductive member 9 is aligned with the receiving surface 8bb to enable positioning.

The conductive member 9 is obtained, for example, by molding a conductive material that is easily adhered or heat-welded to a flexible tube, such as polycarbonate containing carbon nanotubes or polyvinyl chloride containing carbon black. As shown in FIGS. 22 and 23, it is composed of a half-divided member obtained by dividing the cylindrical shape into half, and an inner peripheral surface 9a, a liquid contact portion 9b, a grounding portion 9c and a matching portion 9d are integrally formed. Has been done. The conductive member 9 preferably has a surface resistance of about 10 ² to 10 ¹² Ω, as in the first and second embodiments.

The inner peripheral surface 9a is formed of an arcuate surface, has a shape that follows the outer peripheral surface of the flow path (dialysis fluid outlet tube L2 connected to the connecting portion 8b) to be attached, and has a protruding shape at a predetermined position. The liquid contact portion 9b formed in the above is formed. The liquid contact part 9b is a part that is inserted into an insertion hole L2a formed at a predetermined position of the dialysate outlet tube L2 and is capable of contacting the dialysate (a liquid flowing through the dialysate outlet tube L2).

The matching portion 9d is formed of an edge surface of the conductive member 9 and can match the receiving surface 8bb of the fixed portion 8ba. Then, when the matching portion 9d is matched with the receiving surface 8bb of the fixing portion 8ba, the liquid contact portion 9b is positioned to match the insertion hole L2a of the dialysate outlet tube L2, and therefore, as shown in FIG. The inner peripheral surface 9a can be fixed by adhering the inner peripheral surface 9a to the outer peripheral surface of the dialysate outlet tube L2 while inserting the liquid portion 9b into the insertion hole L2a.

The grounding portion 9c is composed of a part of the outer peripheral surface of the conductive member 9, and can be grounded by contact with the grounding means E (see FIG. 2) attached to the cover H, and is connected to the dialysate outlet tube L2 and it. It is possible to dissipate the charge carried in the liquid in the flow path to the outside. In particular, in the present embodiment, the contact portion of the grounding portion 9c with the grounding means E is formed of a substantially flat surface, and the substantially flat surface can be in surface contact with the grounding means E.

That is, like the first and second embodiments, when the cover H is closed, the flexible tubes for ironing (D1 to D5) are attached to the blood pump P1 and the ironing pump (P2 to P5) all together. As shown in FIG. 18, since the grounding means E comes into contact with the grounding portion 9c of the conductive member 9, it is possible to dissipate the charge carried in the dialysate outlet tube L2 and the liquid in the flow path connected thereto to the outside. You can do it.

According to the present embodiment, the contact portion of the ground portion 9c with the grounding means E is formed of a substantially flat surface, so that the contact between the grounding portion 9c and the grounding means E can be reliably performed as a surface contact, It is possible to satisfactorily and surely dissipate the charges carried in the flow path (dialysate outlet tube L2 and the flow path connected thereto) to the outside. Moreover, according to this embodiment, while having the connection part 8b which consists of an insulating member which can connect the edge part of the dialysate extraction|leading-out tube L2, the said connection part 8b makes the electroconductive member 9 match, and positions and fixes it. Since the possible fixing portion 8ba is formed, the conductive member 9 can be accurately and stably attached to the dialysate outlet tube L2.

Furthermore, since the connecting portion 8b according to the present embodiment is formed on an arbitrary component (the pressure monitor chamber 8 in the present embodiment) connected to the dialysate outlet tube L2 (flow path), a part of the arbitrary component is formed. It is possible to have both a connection function of connecting the dialysate outlet tube L2 to and a fixing function of positioning and fixing the conductive member 9. In the present embodiment, the connection portion 8b is formed in the pressure monitor chamber 8, but other arbitrary components (measuring the fluid pressure) connected to the flow passage (dialysate outlet tube L2 or another flow passage) are connected. In addition to the above, other parameters such as those for measuring other parameters with respect to the liquid flowing through the flow channel, or those such as a pump for sending the liquid through the flow channel) may be used. Further, it is possible to provide a medical circuit or a blood purification device that has the effects of the antistatic device of the above embodiment.

Although the present embodiment has been described above, the present invention is not limited to this. For example, the conductive members (6, 7, 9) constituting the antistatic device contain a carbon nanotube-containing polycarbonate or carbon black. The material is not limited to polyvinyl chloride and may be other general-purpose conductive material (metal or the like). The grounding position of the antistatic device is not limited to the dialysate outlet tube L2, but may be in the middle of the dialysate inlet tube L1, the arterial blood circuit 1a, and the venous blood circuit 1b, and may be the blood pump P1 or the ironing pump. It may be between the positions where (P2 to P5) are arranged or on the upstream side (patient side) of the blood pump P1.

Further, in the present embodiment, the grounding means E is formed on the cover H, but it may be formed on another portion and brought into contact with the grounding portion of the conductive member. The dialyzer 2 may be replaced with another blood purifier (hemofilter, plasma separator, blood adsorber, etc.), or the blood circuit 1 may be replaced with a blood flow path (for example, a fluid such as an infusion or a blood transfusion) which is not circulated externally. Road). The blood purification treatment applied is not limited to dialysis treatment, and may be a blood purification device for other treatment that purifies the blood of the patient while circulating it extracorporeally.

And wetted capable protruding wetted dialysis solution is inserted in a press-fit state insertion hole composed of an opening formed in the flow path, configured to be grounded in contact with the grounding means, the dialysate flow path In addition to having a conductive member integrally formed with a grounding part capable of dissipating the charged electric charge to the outside, the conductive member is inserted into a flexible tube forming a flow channel to adhere to the outer peripheral surface of the flow channel. If a through hole having a peripheral surface is formed and the projection of the liquid contact portion is formed in a continuous shape with respect to the inner peripheral surface of the flexible tube forming the flow path , the antistatic device has another function. May be added.

1 blood circuit 1a arterial blood circuit (flow path)
1b Vein side blood circuit (flow path)
2 dialyzer (blood purifier)
3 Weight scale 4 Weight scale 5 Antistatic tool 6 Conductive member 7 Conductive member 8 Connection part 9 Conductive member P1 Blood pump (ironing pump)
P2-P5 Ironing pump L1 Dialysate introduction tube (flow path)
L2 dialysate outlet tube (flow path)
L3 replacement fluid introduction tube (flow path)
D1-D5 Flexible tube for ironing (flow path)

Claims (6)

It is attached to a flow path composed of a flexible tube through which the dialysate can flow, and a predetermined portion of the dialysate can be brought into contact with the dialysate. In an antistatic device that can dissipate the charge carried in the liquid to the outside,
A protrusion-shaped liquid contact part that is inserted into an insertion hole formed by an opening formed in the flow path in a press-fitted state and is capable of contacting the dialysate; A conductive member integrally formed with a grounding part capable of dissipating an electric charge carried by the dialysate to the outside, and the conductive member is formed by inserting a flexible tube forming the flow path into the flow path. A through hole having an inner peripheral surface that adheres to the outer peripheral surface of the liquid contact part is formed, and the protruding end of the liquid contact portion has a shape continuous with the inner peripheral surface of the flexible tube forming the flow path. Antistatic tool characterized by. The flow path, antistatic device of claim 1 Symbol mounting, characterized in that the squeezing-type pump roller flow direction of dialysate capable of feeding by squeezing the rotating flow path is disposed. The wetted portion has a large diameter portion which is larger in diameter than the insertion hole of the flow path to the tip, according to claim 1 or claim, characterized in that it is capable of wetted by the large diameter portion Item 2. The antistatic device according to item 2 . Contact portion between the grounding means in the ground portion, antistatic protector according to any one of claims 1-3, characterized in that it consists substantially flat plane. Medical circuit characterized by having a static preventing device according to any one of claims 1-4. Blood purification apparatus characterized by having an antistatic device according to any one of claims 1-4.

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