JP4173831B2 - Sampling device - Google Patents

Description

  The present invention relates to a sampling device that can be installed in a flow path for circulating fluid such as hemodialysis, infusion, or heart-lung machine, and that can sample the fluid flowing in the flow path as needed.

  The hemodialyzer forms a fluid circuit that circulates and circulates blood between a patient's blood vessel and the hemodialyzer, and performs a process such as dialysis on the blood taken out from the patient in the hemodialyzer. After that, the device performs the function of returning the treated blood to the patient again. During the treatment such as dialysis, for example, for the purpose of confirming the dialysate composition concentration and grasping bacterial contamination, an operation of sampling the fluid flowing in the fluid circuit, or applying some medicine to the fluid flowing in the fluid circuit There is a case where an operation of adding (hereinafter, these two types of operations are referred to as “sampling operations” for the sake of simplicity) is required. In such a case, a sampling device is installed in a part of the fluid circuit so that the fluid can be sampled easily.

As a sampling device for such an application, for example, a device disclosed in JP-A-2002-14015 is known. As shown in FIG. 6, this device has an internal flow path 101 that is connected to the inlet portion 102 and the outlet portion 103 and has an inner diameter that is substantially the same as the inner diameter of a pipe that allows fluid to flow. The device body 100 includes a sampling body 104 having a sampling hole 104 in a part of the internal channel 101, and a sampling port portion 110 attached to the device body 100 so as to cover the outer surface of the sampling hole 104.
Although the literature is unknown, as shown in FIG. 7, as shown in FIG. 7, a substantially cylindrical internal flow path 121 having an inlet portion 122 and an outlet portion 123 and sampling branched from a central portion in the longitudinal direction of the internal flow path 121. A device having a configuration in which a cap portion 130 is attached to a device main body 120 in which a sampling port portion 125 surrounding the hole 124 is combined so as to form a substantially T-shape as a whole is also known.
JP 2002-14015 A

In the device shown in FIG. 6, the member that directly seals the sampling hole 102 is the flexible seal body 105, but the sampling port portion 110 is additionally arranged on the outer peripheral side thereof. The fixing block 106 is fixed along, and a disinfecting liquid impregnated body is disposed in the space 107 of the fixing block 106, and a sealing plug 109 is provided to seal the outside of the disinfecting liquid impregnated body.
When flowing a fluid into the internal flow path 101, the flexible sealing body 105 seals the sampling hole 102, and the fixing block 106 is fixed along the outer peripheral side of the flexible sealing body 105. The disinfectant-impregnated body is disposed in the space portion 107 of the block 106, and the fluid flowing through the internal channel 101 is combined with each other so that the opening portion of the space portion 107 is sealed by the sealing plug 109. To prevent leakage. Hereinafter, this state is also referred to as “fluid circulation state”.

When sampling the fluid flowing through the internal flow path 101, the sealing plug 109 is removed, the disinfectant-impregnated body disposed in the space 107 is removed, and then the needle of the syringe is inserted into the flexible seal body 105. Thus, sampling can be performed by sucking the fluid into the syringe. Hereinafter, this state is also referred to as a “sampling state”.
When the needle is pulled out after the sampling is completed, the flexible sealing body 105 can spontaneously seal a mark in which the needle has been inserted due to its own elasticity. Therefore, by attaching the disinfectant-impregnated body and the sealing plug 109 to the fixed block 106 again, it is possible to return to the “fluid circulation state”.

  In addition to this, the prior art sampling device shown in FIG. 6 uses a plurality of bolts 111 to fix the fixing block 106 to the device main body 100, and also liquid-tightly seals the space 107 from the outside. Therefore, it is necessary to use the O-ring 112, and the number of parts constituting one device is large. Therefore, the manufacturing cost of the sampling device is more than a certain limit because it requires a certain amount of material cost, time and labor to manufacture each component of the sampling device and to assemble these components. I had to be. Therefore, there is a limit to keeping the price of the device itself low.

  In addition, since the number of parts is large, it takes time and effort to disassemble the sampling device to make it “sampling state” and to assemble it to make it “flow state of fluid” after sampling. It was.

Further, as the disinfectant-impregnated body, absorbent cotton or the like impregnated with a disinfectant such as 70% ethanol water is often used. If it remains on the outer surface, when the sampling needle is inserted, the disinfecting liquid adheres to the needle tip, and when the needle tip reaches the internal flow path 101, the disinfecting liquid also reaches the internal flow path 101, There was a possibility that the disinfectant was mixed in the flowing fluid.
Furthermore, in the sampling device described in Patent Document 1, the disinfectant-impregnated body is arranged in the space 107, but the disinfectant liquid is placed on the outer surface of the flexible seal body 105 as described above. If the amount of disinfecting liquid impregnated in the disinfecting liquid impregnated body is reduced and the disinfection becomes insufficient, or if the type of disinfecting liquid is inappropriate, When the “sampling state” and the “fluid distribution state” are repeatedly performed alternately several times, bacteria such as Escherichia coli and staphylococci adhere to the space portion 106 or the presence of air causes the bacteria. It was difficult to completely eliminate the possibility of breeding.

  On the other hand, in the conventional example shown in FIG. 7, a plug 131 protrudes below the inner peripheral side of the cap portion 130 so as to fit into the sampling hole 124 of the sampling port portion 125. The cap portion 130 is attached to the sampling port portion 125 by engaging a screw thread provided on the outer peripheral surface of 125 and a screw screw provided on the inner peripheral surface of the outer peripheral wall 132 of the cap portion 130. . The plug 131 is not provided so as to seal the entire sampling hole 124, and one type of indentation exists at the entrance of the sampling hole 124.

In such a sampling device, when fluid flows through the internal flow path 121, the recessed portion of the sampling hole 124 may be a portion where the fluid does not easily flow, and the fluid component may remain in this portion for a long time. In some cases, there is a risk that various bacteria may inhabit and / or propagate. Furthermore, since the fluid flowing through the internal flow path 121 is actually sealed between the thread provided on the outer peripheral surface of the sampling port portion 125 and the cap portion 130 engaged therewith, the sampling hole There was room for miscellaneous bacteria to propagate in the range from the indentation part 124 to the screw thread provided on the outer peripheral surface of the sampling port part 125.
In addition, the sampling device is made of a plastic material such as polypropylene, and the thickness of the wall of the sampling device formed hollow is very small, so when connecting the tube to the sampling device or from the sampling device to the tube When removing the device, an excessive force is applied to the sampling device, so that the sampling device is damaged.

As mentioned above, the problem has been pointed out as described above in the case of using the conventional sampling device shown in FIG. 6 or 7 in the hemodialysis apparatus. The same can occur when used in an apparatus.
Accordingly, an object of the present invention is to provide a sampling device that can solve the above-mentioned multiple problems that may occur when using a sampling device for a hemodialyzer, an infusion device, or a heart-lung machine. To do.

  The invention of the sampling device of the present application has a substantially cylindrical main flow path portion having a main flow path extending in the left-right direction as a longitudinal direction, and a branch extending upward from an intermediate portion of the main flow path portion. A sampling device body comprising a substantially cylindrical branch flow channel portion having a branch flow channel at the same time, and a cap portion that is attached to the opening end of the branch flow channel portion and seals the branch flow channel. In the sampling device, the cap portion is attached to the opening end of the branch channel portion, and the branch channel portion wall portion at the opening end of the branch channel portion is substantially arranged in the thickness direction. An annular holder having a size and shape to cover, an inner peripheral cylindrical wall extending substantially in contact with the inner peripheral surface of the branch channel from the inner peripheral side of the holder, and the outer peripheral side of the holder Min Formed by a cap base composed of an outer peripheral cylindrical wall extending substantially in contact with the outer peripheral surface of the flow path and a sealing body for sealing at least the central opening of the cap base, The sealing body can pierce a sampling needle from the outside when circulating a fluid through the main flow path section, and voluntarily seals the stab of the sampling needle after removing the sampling needle, It is formed by the material which has the elasticity which can prevent that an internal fluid leaks out.

  The sampling device of the present application includes a single member called a sampling device body in which the main channel portion and the branch channel portion are combined so as to form a substantially T shape as a whole, and a substantially annular shape that fits into the branch channel portion. Since it is composed of a cap part composed of two members, a cap base and a sealing body that seals the opening of the cap base, the number of parts essential for forming a device is three points. Thus, the number of parts can be greatly reduced as compared with the sampling device of the prior art. In a preferred embodiment, the sealing body can be provided as an integral part with the cap base, for example by two-color molding. In that case, since the cap part which consists of a sealing body and a cap base | substrate can be used as one member, the number of parts essentially required in order to form a device will be two points.

  In addition, the sampling device of the present application does not have a part to be removed when sampling, and does not particularly require an operation in a preparatory stage for sampling and an operation to be performed after the sampling is completed, and it is easy to stab a needle. Since sampling can be performed by operation, sampling can be performed without much time and effort.

  Since the sampling device of the present application does not have a space in which various germs may be propagated, it is used for hemodialysis or infusion for about 1 to 6 hours, or for an artificial cardiopulmonary application. However, taking measures to prevent contamination by bacteria can be substantially omitted. Therefore, since the sampling device of the present application does not need to use a disinfecting liquid in particular, the possibility that the disinfecting liquid is mixed in the flow path with the sampling operation can be substantially eliminated.

The invention of this application will be described below with reference to the drawings showing preferred embodiments.
(First form)
FIG. 1 shows an exploded cross-sectional view of the most preferred sampling device in the invention of this application. This sampling device has a main channel portion 11 extending in a substantially cylindrical shape with the left-right direction as a longitudinal direction with respect to the paper surface of the figure, and a branch channel portion 21 that branches upward from a substantially central portion of the main channel portion 11 in front. It is substantially comprised by the sampling device main body 10 which has the form which observes from above and cross | intersects substantially T shape, and the cap part 30 attached to the opening end of the branch flow path part 21. FIG.

  The main flow path portion 11 extending in a substantially cylindrical shape of the sampling device main body 10 has a cylindrical space inside, and this space becomes the main flow path 14. In the example shown in FIG. 1, the opening on the left side of the main flow path 14 is the inlet portion 12, and the opening on the right side of the main flow path 14 is the outlet portion 13. The branch channel part 21 branches into the branch channel part 21, and a branch channel 22 is provided inside the branch channel part 21. With regard to the position of the portion where the branch channel portion 21 branches relative to the main channel portion 11, the branch channel portion 21 may be branched from the middle portion of the main channel portion 11. Here, the intermediate portion of the main flow path portion 11 is a portion excluding the end portions on both sides of the main flow path portion 11. However, in a preferred embodiment, the branch flow path portion 21 branches from a substantially central portion of the main flow path portion 11.

  The lower end side of the branch channel 22 communicates with the main channel 14, and the upper end side of the branch channel 22 extends to the open end of the branch channel unit 21. In the illustrated embodiment, the cross-sectional area of the portion where the branch flow path 22 communicates with the main flow path 14 is smaller than the cross-sectional area of the other portions of the branch flow path 22, but this is not always necessary for the present invention. is not. Moreover, since the part above the connection part in the branch flow path 22 has a substantially cylindrical shape, it can be expressed that the branch flow path 22 is also formed in a substantially cylindrical shape as a whole. it can. A thread 24 is formed in a portion near the opening end on the inner peripheral surface side of the branch flow path 22.

  The branch channel 22 is sealed by attaching a cap portion 30. The cap portion 30 includes a cap base 31 that covers the opening end of the branch flow passage portion 21 in a ring shape concentrically with the branch flow passage portion 21, and a sealing body 39 that seals at least the central opening 37 of the cap base portion 31. And is composed of.

  In the invention of this application, the sampling device body 10 can be formed of a metallic material, preferably stainless steel, in particular SUS316. Moreover, the technique of the method of injection-molding using SUS316 is developed, If the SUS316 is used according to the method, the sampling device main body 10 which concerns on invention of this application can be shape | molded by SUS316.

  As a whole, the cap base 31 is rotated by about 45 degrees counterclockwise in the direction that two lines extending obliquely from the upper right side to the lower left side extend from the upper side to the lower side. With the open part of the character facing downward, the figure placed so that the relatively long line is inside the relatively short line, A rotating shaft extending in the vertical direction with a distance further inward than the line is assumed, and has a shape like a rotating body obtained by rotating around the rotating shaft. That is, the cap base 31 includes a holder portion 32 that is substantially annular when the cap base 31 shown in FIG. 1 is observed from above, and an inner peripheral cylindrical shape that extends downward from the inner peripheral side of the holder portion 32. The wall portion 34 and an outer peripheral cylindrical wall portion 33 extending downward from the outer peripheral side of the holder portion 32 are configured.

  When the cap base 31 is attached to the opening end of the branch channel portion 21, the annular holder portion 32 has a size and shape that can overlap a part or all of the annular end surface at the opening end of the branch channel portion 21. The inner circumferential side cylindrical wall portion 34 extends downward while being substantially in contact with the inner circumferential surface of the branch channel portion 21, and the outer circumferential side cylindrical wall portion 33 is the outer circumference of the branch channel portion 21. The relationship extends downward while substantially in contact with the surface. A thread 36 that engages with the thread 24 provided on the inner peripheral surface side of the branch channel portion 21 is provided on a part or the whole of the outer peripheral surface of the inner peripheral cylindrical wall portion 34. .

  In the cap base 31, the relationship between the height at which the inner peripheral cylindrical wall portion 34 and the outer peripheral cylindrical wall portion 33 protrude from the holder portion 32 is not particularly determined. From the viewpoint of workability when attaching and detaching, the relationship in which the protruding height of the inner cylindrical wall portion 34 is larger than the protruding height of the outer cylindrical wall portion 33 is most preferable. Corresponds to the shape of the rotating body using the Katakana character.

  A thread 36 on the outer peripheral surface of the inner cylindrical wall 34 on the cap base 31 side is engaged with the screw 24 on the inner peripheral face side of the branch flow passage 21 to branch the cap base 31. When attached to the path portion 21, at least the tip portion of the outer peripheral side cylindrical wall portion 33 of the cap base 31 comes into contact with the outer peripheral surface of the branch flow passage portion 21. FIG. 2 shows a state in which the cap base 31 is attached to the branch channel portion 21 in this way.

  As shown in FIG. 3, the central opening 37 of the cap base 31 is sealed by filling a sealing body 39 formed separately from the cap base 31. As a material for forming the cap base 31, rigidity that can constitute a lid of the container, and when the sampling needle is inserted into the central opening 37 as will be described later, the tip of the sampling needle is in the center. When contacted at an acute angle with respect to the wall surface of the opening 37, the tip end portion of the sampling needle is slid to have a friction characteristic (or solid lubricity) that can be guided to the back of the central opening 37. Those are preferred. Specifically, ultra high molecular weight polyethylene, high density polyethylene, hard polypropylene, polyacetal, polyamide, polycarbonate, polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, polysulfone, polyethersulfone, polyarylate, polyphenylene sulfide, polyetheretherketone A plastic material selected from the group consisting of polyamideimide, polyetherimide, styrene resin, and fluorine resin, or a plastic material made of two or more polyalloys can be used as the material of the cap base 31.

  The material forming the sealing body 39 can pierce the sampling needle from the outside relatively easily, and after removing the sampling needle, the stab of the sampling needle is spontaneously sealed, The material needs to be elastic enough to prevent leakage. The sampling needle puncture is a mark formed on the sealing body 39 when the sampling needle enters when the sampling needle is inserted into the sealing body 39. Specifically, natural rubber, isoprene rubber, nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, acrylic rubber, butyl rubber, silicone rubber, bromobutyl rubber, halobutyl rubber, ethylene propylene rubber, propylene rubber, chloroprene rubber, chlorosulfonated polyethylene An elastic material selected from the group consisting of styrene / butadiene rubber, butadiene rubber, polysulfide rubber, norbornene rubber and thermoplastic elastomer can be used as the material of the sealing body 39. In addition, such a material is known as a material used for the cap part of a vial bottle, for example.

  The cap part 30 is formed by so-called two-color molding, in which after the cap base 31 is formed, the cap base 31 is placed in a mold for the cap part 30 and the molten material of the sealing body 39 is injected. Can be manufactured.

  FIG. 3A shows a plan view of the cap base 31 observed from above. The part actually appearing in FIG. 3A is the holder part 32 in the cap base 31. As can be understood from the figure, the holder portion 32 has an annular plane shape, and is placed in a molding die to inject a sealing body material. In order to spread to the upper surface side and the lower surface side, the holder portion 32 is provided with a through hole 35 through which the material of the sealing body is circulated. In the example shown in FIG. 3A, the circles of the holder portion 32 that is annular in the plan view have the same radius for the four sectors on each side when the circle is divided into four equal parts through the center. The four through holes 35 are provided at the positions. The number of through-holes is not limited to four, and the number and arrangement of the through-holes is to perform such molding in consideration of the type of sealing material used, the solidification temperature, the solidification time, the viscosity at the time of melting, etc. Based on the technical knowledge of those skilled in the art, various modifications can be made within a range of, for example, about 1 to 12.

  FIG. 3B shows a state in which the sealing body 39 is combined with the holder portion 32 by two-color molding. The holder portion 32 is drawn with a solid line, and the sealing body 39 is drawn with a two-dot chain line. . FIG. 3B shows a state where the cross section along the line B-B ′ in FIG. 3A is observed in the direction of the arrow. The outline shown by the two-dot chain line in FIG. 3B also corresponds to the outline of the mold of the cap portion 30 used for two-color molding. For example, when the holder part 32 is installed in such a mold and the molten sealing material is inserted therein, the sealing material is outlined by a two-dot chain line remaining in the molding die. Go to the space shown. Then, the sealing body 39 of the shape shown in FIG.3 (b) is obtained by solidifying sealing body material.

  Accordingly, the melted sealing material flows through the through hole 35 of the holder portion 32, and not only the central opening 37 of the cap base 31, but also the upper surface side of the holder portion 32 and the through hole 35. Furthermore, the lower portion between the inner peripheral cylindrical wall portion 34 and the outer peripheral cylindrical wall portion 33 of the holder portion 32 can also be satisfied. Therefore, the sealing body 39 is arranged in an annular shape at the lower portion of the holder portion 32. Here, for convenience of explanation, a portion of the sealing body 39 that fills the entire central opening 37 of the cap base 31 and functions as a plug of the central opening 37 is also referred to as a “plug portion”. A portion arranged in an annular shape in a lower portion between the side cylindrical wall portion 34 and the outer peripheral side cylindrical wall portion 33 is also referred to as an “annular portion”.

The plug portion of the sealing body 39 fills the entire cylindrical central opening 37 that opens in the central portion of the cap base 31 and extends in the vertical direction. In addition, on the lower end side of the central opening 37 The lower portion of the plug portion of the sealing body 39 is a portion having a larger radius than the central opening 37. In the example shown in FIG. 2, the surface facing the main channel 14 at the lower end of the plug portion of the sealing body 39 is substantially flush with the surface of the wall portion forming the main channel 14 in the main channel 11. It becomes the surface which becomes. Accordingly, the main flow path 14 can function as a tubular flow path having substantially no unevenness in the main flow path portion 11. However, in practice, it is always possible to ensure that the surface facing the main channel 14 at the lower end of the plug portion of the sealing body 39 is substantially flush with the surface of the wall portion forming the main channel 14. is not. In such a case, the lower end portion of the plug portion of the sealing body 39 is slightly protruded toward the main flow path 14 with respect to the wall surface forming the main flow path 14 in the main flow path portion 11 (main flow). Form that is convex in the passage 14), as viewed from the main flow path 14 side, a form that is recessed from the surface of the wall portion that forms the main flow path 14 in the main flow path portion 11 (a form that is concave from the main flow path 14) Is more preferable. The reason for this is that, in a form that is concave from the main flow path 14, a recess is formed in the main flow path 14, which is a portion recessed from the surface of the wall portion that forms the main flow path 14, and the fluid flows at the recess. This is because there is a possibility that miscellaneous bacteria may accumulate in the recess or propagate. And if it is a form convex in the main flow path 14, it is because the part where the flow of the fluid worsens in the main flow path 14 can be decreased, and preferably can be substantially eliminated.
Further, as shown in FIG. 1, a tapered portion 38 that opens upward from the cylindrical central opening 37 is formed on the inner peripheral side of the holder portion 32 on the upper end side of the central opening 37. Although formed, the upper portion of the plug portion of the sealing body 39 also fills the entire tapered portion 38 and continues further upward. The top portion of the plug portion of the sealing body 39 is expanded in a circle so as to substantially cover the upper surface of the circular cap portion when the cap portion is observed from above, and from the front side as shown in FIG. Observed, the center portion is the highest bulging dome shape.

  When such a cap part 30 is attached to the branch channel part 21, even if fluid flows into the engaging part between the cap part 30 and the branch channel part 21 from the branch channel 22 side. The annular portion of the sealing body 39 existing below the holder portion 32 functions as a packing, and can block the fluid from the branch flow path 22 side. Therefore, it is possible to effectively prevent the fluid from leaking from between the cap part 30 and the branch flow path part 21 by the annular part of the sealing body 39 arranged below the holder part 32.

  Next, a state in which the sampling device according to the present invention is used will be described with reference to FIG. FIG. 4A shows a plan view of the sampling device in a state in which tubes 51 and 52 for circulating blood are connected in the case of a hemodialysis apparatus to the sampling device of the present invention, and FIG. The front view of a state is shown. Either side of the two openings of the main channel portion of the sampling device may be the inlet side. In this example, with respect to FIG. 4B, the left side is the entrance and the right is the exit. Therefore, the tube 51 is a tube through which blood is sent, and the tube 52 is a tube through which blood comes out from the sampling device. FIG. 4C shows a state where the sampling needle 53 is inserted into the sealing body 39 of the sampling device in such a state, as observed from the right side surface side of the sampling device.

  A smooth cylindrical space is formed by the inner peripheral surface of the inner peripheral cylindrical wall portion 34 extending downward from the lower end portion of the tapered portion 38 provided on the inner peripheral side of the holder portion 32. Furthermore, since the material forming the cap base 31 is relatively hard and has a relatively small coefficient of friction, the inner peripheral surfaces of the tapered portion 38 and the inner peripheral cylindrical wall portion 34 are It functions as an insertion guide when the sampling needle is inserted.

  Since the sealing body 39 has elasticity that allows the sampling needle 53 to be inserted from the outside relatively easily, when the operator inserts the sampling needle 53 into the sealing body 39 from directly above, the sampling needle 53 The distal end portion is guided by the tapered portion 38 of the holder portion 32 that functions as an insertion guide and the inner peripheral surface of the inner peripheral cylindrical wall portion 34, and can smoothly reach the main flow path 14. If the angle at which the sampling needle 53 is inserted is within a range in which the sampling needle 53 can be inserted linearly from the upper end portion to the lower end portion of the cylindrical space inside the inner peripheral cylindrical wall portion 34, the holder portion 32. The taper portion 38 and the inner peripheral surface of the inner peripheral cylindrical wall portion 34 sufficiently function as an insertion guide. Therefore, it is possible to collect (sampling) a fluid intended for the sampling operation, for example, blood.

  Moreover, since the sealing body 39 has sufficient elasticity as described above, after the sampling needle 53 is pulled out, the sealing body 39 can spontaneously seal the stab of the sampling needle by its elasticity. For example, even when a fluid having a pressure in the range of −60 kPa to 100 kPa is circulated through the main flow path 14, the sealing body 39 can seal the stab of the sampling needle after the sampling needle 53 is removed. Therefore, it is possible to reliably prevent the fluid flowing through the main flow path 14 from leaking to the upper portion of the sealing body 39 through the stab of the sampling needle after the sampling needle 53 is pulled out.

  The sampling device of the present invention has been described by taking the most preferred form as an example. However, in the context of the present invention, when referred to as sampling or collection, it means only the operation of sampling the fluid flowing in the flow path. It should be noted that it is also possible to perform an operation of adding some medicine into the main channel 14 through a needle inserted into the main channel 14. Accordingly, by installing the sampling device of the present invention in a flow path for flowing fluid such as hemodialysis, infusion, or cardiopulmonary bypass, it is possible to collect fluid flowing in the flow path. It is also possible to add some chemicals to the fluid that circulates.

(Second form)
FIG. 5 shows another preferred embodiment of the sampling device of the present invention. The internal configuration of the sampling device in this embodiment is the same as that of the first embodiment described above, but is different from the first embodiment in that a bulging portion 60 is provided outside the main flow path portion. The bulging portion 60 is provided outside the device on the front side and the rear side of the portion where the main channel portion and the branch channel portion intersect to increase the thickness in the front-rear direction of the device. In FIG. 5, the bulging portion 60 is a thick disk such as erythrocytes and has a shape in which the central portion is slightly recessed and the outer peripheral portion is raised, but is not limited to this example. Any shape that swells forward and rearward and can be easily held by a finger from both directions may be used. Therefore, the planar shape of the bulging portion 60 observed from the front is not limited to a circle, but may be a shape surrounded by a quadrangular or higher polygon, or a combination of various curves and straight lines.

FIG. 1 is a longitudinal sectional view of the sampling device in an exploded state. FIG. 2 is a longitudinal sectional view of the sampling device in a combined state. FIG. 3 is a plan view of the cap base and a longitudinal sectional view of a state in which a sealing body is attached to the cap base. FIG. 4 is a plan view, a front view, and a side view showing a sampling device in a use state with a tube connected thereto. FIG. 5 is a diagram showing another form of the sampling device of the present invention. FIG. 6 shows a prior art sampling device. FIG. 7 is a diagram illustrating another prior art sampling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Sampling device main body, 11 ... Main channel part, 12 ... Inlet part, 13 ... Outlet part, 14 ... Main channel, 21 ... Branch channel part, 22 ... Branch channel, 24 ... Screw thread, 30 ... Cap part, 31 ... Cap base, 32 ... Holder, 33 ... Outer cylindrical wall, 34 ... Inner cylindrical wall, 35 ... Through hole, 36 ... Thread, 37 ... Central opening, 38 ... Taper, 39 ... Sealed body, 51, 52 ... Tube, 53 ... Sampling needle, 60 ... Swelling part.

Claims (7)

A substantially cylindrical main flow path portion having a main flow path in the left-right direction as a longitudinal direction, and a branch flow path extending in an upward direction from an intermediate portion of the main flow path portion, and having a branch flow path therein. A sampling device comprising at least a sampling device body composed of a cylindrical branch channel part, and a cap part that is attached to the opening end of the branch channel part and seals the branch channel,
The cap portion is attached to the opening end of the branch channel portion, and has an annular shape and shape that substantially covers the branch channel portion wall portion at the opening end of the branch channel portion in the thickness direction. A holder portion, an inner peripheral cylindrical wall portion extending downwardly in contact with the inner peripheral surface of the branch flow channel portion from the inner peripheral side of the holder portion, and an outer periphery of the branch flow channel portion from the outer peripheral side of the holder portion A cap base composed of an outer peripheral cylindrical wall extending substantially in contact with the surface and extending downward, and a sealing body for sealing at least the central opening of the cap base,
The sealing body exists in an annular shape between the inner peripheral side cylindrical wall portion and the outer peripheral side cylindrical wall portion on the lower surface side of the holder portion and the stopper portion that seals the entire central opening of the cap base. When the fluid is circulated through the main flow path portion, the sampling needle can be inserted from the outside, and the sampling needle can be spontaneously inserted after the sampling needle is pulled out. A sampling device characterized by being made of an elastic material that can be sealed to prevent leakage of fluid inside. The sampling device according to claim 1, wherein the cap base and the sealing body are integrally formed by two-color molding .   The thread portion provided on the outer peripheral surface of the inner peripheral cylindrical wall portion of the cap base engages with the screw portion provided on the inner peripheral surface near the opening end of the branch flow path portion. The sampling device according to claim 1, wherein the cap unit is attached to the sampling device body. In the cap base body, the holder portion is provided with at least one through hole penetrating the holder portion in the vertical direction ,
The top portion of the plug portion covers the entire upper surface side of the cap portion, and the central portion is the highest bulging dome shape,
The sampling device according to any one of claims 1 to 3, wherein the plug portion and the annular portion communicate with each other by a sealing body disposed in a through hole.   The sampling device according to any one of claims 1 to 4, wherein when the cap portion is attached to the sampling device body, the sealing body seals substantially the entire branch flow path.   6. The sampling according to claim 5, wherein when the cap part is attached to the sampling device body, the annular part of the sealing body seals between the holder part and the open end of the branch channel part. device.   The sampling device according to any one of claims 4 to 6, wherein through-holes are arranged at two or more rotationally symmetric positions of the holder portion that is substantially annular as viewed from above.

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