Adapter and blood collection kit

Abstract

To provide an adapter for suppressing rotation of the adapter with respect to a blood sampling holder so as to prevent the adapter from coming off the blood sampling holder.SOLUTION: An adapter 20 includes: a hollow main body part 21 which can be connected to a blood sampling tool for sampling blood from a human body and in which the sampled blood flows; a flange part 22 which is arranged on a proximal end side of the main body part 21 so as to be abutted to a distal end surface 8 of a mounting part 4; and a cylindrical extension part 23 which is extended in the opposite direction of the main body part 21 from the flange part 22 so as to be inserted to a through-hole 9 of the mounting part 4. A male screw part 26 is formed on an outer periphery of the extension part 23. The adapter has a projection part 27 where a part of the male screw part 26 or a part of a female screw part 6 is locally projected. The male screw part 26 or the female screw part 6 are more strongly brought into pressure-contact at the projection part 27 than the other parts.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an adapter and a blood sampling kit.

Background Art

[0002] Conventionally, when collecting a blood sample for a blood test or the like, a blood sampling kit is used. The blood sampling kit collects blood from a human body with a blood sampling tool, and stores the collected blood sample in a vacuum blood collection tube attached to a blood sampling holder. The blood sampling kit includes a blood sampling tool, an adapter to which the blood sampling tool is connected, a blood sampling holder to which the adapter is attached, and a vacuum blood collection tube. A method has been proposed in which the adapter is attached to the blood sampling holder by screwing a male screw formed on the adapter into a female screw formed on the blood sampling holder (see, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] This conventional adapter includes a cylindrical main body portion that can be connected to a blood sampling tool, and a cylindrical extending portion that extends in the base end direction from a flange portion provided at the base end portion of the main body portion. A male screw is formed on the outer periphery of the extending portion. Thereby, the male screw of the adapter is screwed into the female screw formed on the mounting portion of the blood sampling holder, and the adapter is mounted on the blood sampling holder.

[0005] Also, a syringe is provided inside the extending portion, and the collected blood is transported to the blood collection tube through the inside of the syringe.

[0006] Incidentally, if the adapter detaches from the blood collection holder, the needle tube inside the extended portion will be exposed, so it is preferable to prevent the adapter from falling off the blood collection holder.

[0007] However, since the adapter and the blood collection holder are connected by a screw-in mechanism, repeated attachment and detachment of the blood collection device to the adapter may cause the adapter to rotate relative to the blood collection holder, potentially leading to the adapter detaching from the blood collection holder.

[0008] In view of the above, the present invention aims to provide an adapter that is less likely to fall off a blood collection holder by suppressing the rotation of the adapter relative to the blood collection holder. [Means for solving the problem]

[0009] The adapter of the present invention An adapter that is attached to a mounting part provided at the bottom of a closed-bottom cylindrical blood collection holder, which has a female thread on the inner surface of the through-hole that partitions the through-hole, The aforementioned adapter can be connected to a blood collection device used to collect blood from the human body and has a hollow main body through which the collected blood flows, A flange portion provided on the base end side of the main body portion and in contact with the tip surface of the mounting portion, It comprises a cylindrical extending portion that extends from the flange portion in the direction opposite to the main body portion and is inserted into the through hole of the mounting portion, A male threaded portion is formed on the outer circumference of the extended portion. The male screw portion Mountains or valleys part 、 Or, the female thread portion Mountains or valleys part From, radially outward, or in the direction of the central axis of the male or female thread portion. The present invention is characterized by having a locally protruding portion, which causes the male thread portion and the female thread portion to be pressed together more strongly at the protruding portion than at other parts.

[0010] According to the adapter of the present invention, the extended portion is inserted into the through hole of the mounting portion of the blood collection holder, and the flange portion is brought into contact with the tip surface of the mounting portion. Since the extended portion has a male threaded portion, the male threaded portion can be screwed into the female threaded portion formed in the mounting portion.

[0011] Furthermore, a portion of the male threaded portion has a locally protruding projection, which contacts a portion of the female threaded portion, causing the male and female threaded portions to press against each other more strongly at the projection than at other parts.

[0012] In other words, the male threaded portion is tightly fitted locally into the female threaded portion.

[0013] Therefore, the resistance force when rotating the male threaded portion against the female threaded portion in the unscrew direction can be increased, which can prevent the adapter from falling out of the blood collection holder.

[0014] Furthermore, if a portion of the female thread has a locally protruding projection, the projection will come into contact with a portion of the male thread, causing the male and female threads to press against each other more strongly at the projection than at other parts.

[0015] In other words, the male threaded portion is tightly fitted locally into the female threaded portion.

[0016] Therefore, the resistance force when rotating the male threaded portion against the female threaded portion in the unscrew direction can be increased, which can prevent the adapter from falling out of the blood collection holder.

[0017] In the adapter of the present invention, it is preferable that the protruding portion is formed closer to the tip than the intermediate portion of the spiral stroke of the male screw portion, or closer to the tip than the intermediate portion of the spiral stroke of the female screw portion.

[0018] According to this configuration, since the protruding portion is formed on the tip side rather than the middle portion of the spiral stroke of the male screw portion, when the male screw portion is rotated in the screwing-off direction with respect to the female screw portion, compared with the case where the protruding portion is formed on the base end side rather than the middle portion, the protruding portion abuts on a part of the female screw portion over a longer stroke.

[0019] Therefore, it is possible to further suppress the adapter from falling off the blood collection holder.

[0020] Also, when it is formed on the tip side rather than the middle portion of the spiral stroke of the female screw portion, when the male screw portion is rotated in the screwing-off direction with respect to the female screw portion, compared with the case where the protruding portion is formed on the base end side rather than the middle portion, the protruding portion abuts on a part of the male screw portion over a longer stroke distance.

[0021] Therefore, it is possible to further suppress the adapter from falling off the blood collection holder.

[0022] In the adapter of the present invention, it is preferable that the adapter is formed of a material having a higher deflection temperature under load than the mounting portion.

[0023] According to this configuration, for example, by undergoing a heat cycle of heating and cooling in the manufacturing process, since the adapter is formed of a material having a higher deflection temperature under load than the mounting portion, the mounting portion has a larger amount of thermal contraction than the extending portion provided in the adapter.

[0024] By this amount, the pressure contact between the female screw portion and the male screw portion in the protruding portion can be made firmer.

[0025] Also, in the mounting portion, the portion that abuts on the protruding portion undergoes heat treatment and is deformed in the direction in which it is pressed. Then, the protruding portion serves as an anchor that catches on the deformed portion.

[0026] Therefore, it is possible to further suppress the adapter from falling off the blood collection holder.

[0027] In the adapter of the present invention, the female thread portion is formed intermittently in the circumferential direction, and a projection is formed in a part of the valley of the male thread portion, projecting radially outward. Preferably, the tip of the projection is located radially outward from the peak of the female thread portion and radially inward from the valley of the female thread portion.

[0028] According to this configuration, when the male thread is unscrewed from the female thread, the cut end of the female thread comes into contact with the projection, and the female thread is locked in place by the projection.

[0029] Therefore, rotation in the screw-out direction is suppressed, preventing the adapter from falling out of the blood collection holder.

[0030] In the adapter of the present invention, it is preferable that the projection has an inclined surface that guides the cut end of the female thread when screwing the male thread and female thread together, and a locking surface that engages the cut end of the female thread when unscrewing the male thread and female thread together.

[0031] According to this configuration, when screwing the male threaded portion into the female threaded portion, the cut end of the female threaded portion comes into contact with the inclined surface formed on the projection, and the female threaded portion can easily overcome the projection by using the inclined surface.

[0032] On the other hand, when unscrewing the male threaded portion from the female threaded portion, the cut end of the female threaded portion comes into contact with the locking surface formed on the projection, and the female threaded portion is locked in place by the locking surface, making it difficult to overcome the projection.

[0033] Therefore, it is possible to prevent the adapter from falling out of the blood collection holder.

[0034] In the adapter of the present invention, an inclined surface that guides the projection when screwing the male thread portion and the female thread portion together, and a locking surface that engages the projection when unscrewing the male thread portion and the female thread portion together, may be formed at the cut end of the female thread portion.

[0035] According to this configuration, when screwing the male threaded portion into the female threaded portion, the projection comes into contact with the inclined surface formed at the cut end of the female threaded portion, and the projection can easily overcome the female threaded portion by utilizing the inclined surface.

[0036] On the other hand, when unscrewing the male threaded portion from the female threaded portion, the projection comes into contact with a locking surface formed at the cut end of the female threaded portion, and the projection is locked in place by the locking surface, making it difficult to overcome the female threaded portion.

[0037] Therefore, it is possible to prevent the adapter from falling out of the blood collection holder.

[0038] In the adapter of the present invention, the male thread portion is formed intermittently in the circumferential direction, and a projection is formed in a part of the valley of the female thread portion, projecting radially inward. The tip of the projection may be located radially inward from the peak of the male thread portion and radially outward from the valley of the male thread portion.

[0039] According to this configuration, when the male thread is unscrewed from the female thread, the cut end of the male thread comes into contact with the projection, and the male thread is locked in place by the projection.

[0040] Therefore, rotation in the screw-out direction is suppressed, preventing the adapter from falling out of the blood collection holder.

[0041] In the adapter of the present invention, the projection may have an inclined surface that guides the cut end of the male thread when screwing the male thread and female thread together, and a locking surface that engages the cut end of the male thread when unscrewing the male thread and female thread together.

[0042] According to this configuration, when screwing the male threaded portion into the female threaded portion, the cut end of the male threaded portion comes into contact with the inclined surface formed on the projection, and the male threaded portion can easily overcome the projection by using the inclined surface.

[0043] On the other hand, when unscrewing the male threaded portion from the female threaded portion, the cut end of the male threaded portion comes into contact with the locking surface formed on the projection, and the male threaded portion is locked in place by the locking surface, making it difficult to overcome the projection.

[0044] Therefore, it is possible to prevent the adapter from falling out of the blood collection holder.

[0045] In the adapter of the present invention, an inclined surface that guides the projection when screwing the male thread portion and the female thread portion together, and a locking surface that engages the projection when unscrewing the male thread portion and the female thread portion together, may be formed at the cut end of the male thread portion.

[0046] According to this configuration, when screwing the male threaded portion into the female threaded portion, the projection comes into contact with the inclined surface formed at the cut end of the male threaded portion, and the projection can easily overcome the male threaded portion by utilizing the inclined surface.

[0047] On the other hand, when unscrewing the male threaded portion from the female threaded portion, the projection comes into contact with a locking surface formed at the cut end of the male threaded portion, and the projection is locked in place by the locking surface, making it difficult to overcome the male threaded portion.

[0048] Therefore, it is possible to prevent the adapter from falling out of the blood collection holder.

[0049] A blood collection kit collects blood from the human body using a blood collection device and stores the collected blood sample in a vacuum blood collection tube attached to a blood collection holder. The kit may comprise a blood collection device, an adapter of the present invention to which the blood collection device is connected, a blood collection holder to which the adapter is attached, and a vacuum blood collection tube.

[0050] With this blood collection kit configuration, it is possible to prevent the adapter from falling off the blood collection holder. [Brief explanation of the drawing]

[0051] [Figure 1] An explanatory diagram showing the blood collection kit of this embodiment. [Figure 2] A side view of the adapter shown in Figure 1. [Figure 3] Figure 2 shows a cross-sectional view of the adapter attached to the blood collection holder. [Figure 4] A diagram showing the male threaded portion screwed into the female threaded portion. [Figure 5] A magnified view of the tip of the adapter shown in Figure 2. [Figure 6] Figure 3 shows a magnified view of the male and female threaded portions. [Figure 7] Figure 3 shows a cross-sectional view of the adapter and blood collection holder along line VII-VII. [Figure 8] A diagram showing the male thread being screwed into the female thread. [Figure 9] A diagram showing the male thread being unscrewed from the female thread. [Modes for carrying out the invention]

[0052] Referring to the figures, the blood collection kit 1 according to an embodiment of the present invention will be described in detail. The same or corresponding components may be denoted by the same reference numerals, and their descriptions may be omitted as appropriate.

[0053] Furthermore, in the following explanation, the rotational direction when screwing the male threaded portion 26 into the female threaded portion 6 will be described as the first direction (arrow A in Figure 8), and the rotational direction when unscrewing the male threaded portion 26 from the female threaded portion 6 will be described as the second direction (arrow B in Figure 9).

[0054] As shown in Figure 1, the blood collection kit 1 collects blood from the human body using a blood collection device (hereinafter referred to as a winged needle) 40, and stores the collected blood in a vacuum blood collection tube 2 attached to a blood collection holder 3.

[0055] The blood collection kit 1 comprises a bottomed cylindrical blood collection holder 3 to which a vacuum blood collection tube 2 for collecting blood is attached, an adapter 20 attached to a mounting part 4 provided at the bottom 7 of the blood collection holder 3, a connector 50 connected to the adapter, a flexible tube 51 extending from the connector 50, and a winged needle 40 connected to the flexible tube 51.

[0056] The adapter 20 is provided with a needle tube 52 inserted into a communication hole 29 (see Figure 2) formed in the needle base 25. The needle tube 52 is covered with a rubber sleeve (not shown) to protect it until the adapter 20 is attached to the blood collection holder 3. When the adapter 20, which was a separate component, is attached to the blood collection holder 3, the needle tube 52 is attached with the rubber sleeve still covering it. After the adapter 20 is attached to the blood collection holder 3, the vacuum blood collection tube 2 is attached to the blood collection holder 3 with the needle tube 52 inserted into it.

[0057] The winged needle 40 comprises a hub 42 that supports a needle tube 41 with a sharp front end, and a pair of wing-shaped members 43 fitted onto the hub 42.

[0058] Next, I will explain adapter 20.

[0059] As shown in Figure 2, the adapter 20 comprises a hollow main body portion 21 through which collected blood flows, which can be connected to the winged needle 40 (see Figure 1) via a connector 50 (see Figure 1); a flange portion 22 provided on the base end side of the main body portion 21 and in contact with the tip surface 8 (see Figure 3) of the mounting portion 4; and a cylindrical extension portion 23 extending from the flange portion 22 in the direction opposite to the main body portion 21 and inserted into the through hole 9 (see Figure 3) of the mounting portion 4.

[0060] The main body 21 has a Luer taper shape at the connection port, for example, a circular cross-section with a diameter of 4 mm and a taper of 6 / 100. In this embodiment, the main body 21 is made into a Luer taper shape, but it may be cylindrical or have any other taper shape.

[0061] Two ribs 28 are formed between the main body portion 21 and the flange portion 22. In this embodiment, there are two ribs 28, but the invention is not limited to this. Any other number, such as four, may be used as long as they can guide the connector 50 (see Figure 1) when connecting it to the adapter 20. Furthermore, if the main body portion 21 and the flange portion 22 have sufficient strength, the ribs 28 may be omitted.

[0062] A rubber sleeve fitting portion 24 is formed at the tip end of the extended portion 23, into which a rubber sleeve is fitted. A tapered needle base 25 is formed at the tip end of the rubber sleeve fitting portion 24 to guide the extended portion 23 when it is inserted into the mounting portion 4.

[0063] The outer circumference of the extended portion 23 has a male threaded portion 26 which is screwed into a female threaded portion 6 formed on the inner circumferential surface of the through hole 9 of the mounting portion 4, and the flange portion 22 is brought into contact with the tip surface 8 of the mounting portion 4, thereby attaching the extended portion 23 of the adapter 20 to the mounting portion 4 (see Figure 3).

[0064] The male threaded portion 26 of the adapter 20 shown in Figure 2 has a length of 4 mm and is a double-start thread with a pitch of 2.6 mm.

[0065] In this embodiment, a two-start thread is used, but a single-start thread is also acceptable, and a multi-start thread with three or more starts may be formed. Furthermore, there are no restrictions on the length or pitch of the screw; it just needs to function as a screw.

[0066] Figure 4 shows the spiral shape profiles of the peaks 261 and valleys 262 of the spirally extending male thread portion 26, and the peaks 61 and valleys 62 of the female thread portion 6, for one of the two-start threads. For ease of explanation, the total stroke distance of the thread is represented as 3π in Figure 4. Figure 4 shows the male threaded portion 26 and the female threaded portion 6 in a fully screwed-in state.

[0067] In the following, we will only explain the relationship between the male thread portion 26 and the female thread portion 6 of one of the two-start threads, but the relationship between the male thread portion 26 and the female thread portion 6 of the other single-start thread is similar.

[0068] The horizontal axis of the upper diagram in Figure 4 represents the circumferential positions of the valleys 62 of the female thread portion 6 and the peaks 261 of the male thread portion 26, respectively, using the azimuth angle (rad) around the central axis of the female thread portion 6 and the azimuth angle (rad) around the central axis of the male thread portion 26. The starting point of the valleys 62 of the female thread portion 6 and / or the starting point of the peaks 261 of the male thread portion 26 do not necessarily coincide with an azimuth angle of 0 rad. Similarly, the ending point of the valleys 62 of the female thread portion 6 and / or the ending point of the peaks 261 of the male thread portion 26 do not necessarily coincide with an azimuth angle of 3π.

[0069] The vertical axis of the diagram in the upper part of Figure 4 represents the radial positions of the valleys 62 of the female thread portion 6 and the peaks 261 of the male thread portion 26, respectively.

[0070] In the diagram, the radial position of the groove 62 of the female thread, represented by the dashed line, is constant within the azimuth angle range Θ=0 to Θ1 (for example, Θ1=3π / 4 to πrad). The radial position of the groove 62 of the female thread changes continuously radially outward as the azimuth angle Θ increases from Θ=Θ1, and then continuously radially inward as the azimuth angle Θ further increases, returning to its original position (position at Θ=Θ1) at Θ=Θ2 (for example, between 3π / 2 and 2πrad). The radial position of the groove 62 of the female thread is constant within the azimuth angle range beyond Θ=Θ2.

[0071] In the diagram, the radial position of the crest 261 of the male thread, represented by a solid line, is constant in the azimuth angle range Θ=0 to Θ3 (for example, Θ3=π / 2 to πrad) and is radially inward of the radial position of the valley 62 of the female thread. The radial position of the crest 261 of the male thread changes continuously radially outward as the azimuth angle Θ increases from Θ=Θ3 until it reaches the radial position of the valley 62 of the female thread 6. Then, as the azimuth angle Θ further increases, it changes continuously radially inward from the radial position of the valley 62 of the female thread 6 and returns to its original position (position at Θ=Θ3) at Θ=Θ4 (for example, between 3 / 2π and 2πrad). The radial position of the crest 261 of the male thread is constant in the azimuth angle range beyond Θ=Θ4.

[0072] The horizontal axis of the diagram at the bottom of Figure 4 represents the circumferential positions of the peaks 61 of the female thread portion 6 and the valleys 262 of the male thread portion 26, respectively, using the azimuth angle (rad) around the central axis of the female thread portion 6 and the azimuth angle (rad) around the central axis of the male thread portion 26. The starting point of the peaks 61 of the female thread portion 6 and / or the starting point of the valleys 262 of the male thread portion 26 do not necessarily coincide with an azimuth angle of 0 rad. Similarly, the ending point of the peaks 61 of the female thread portion 6 and / or the ending point of the valleys 262 of the male thread portion 26 do not necessarily coincide with an azimuth angle of 3π.

[0073] In the diagram at the bottom of Figure 4, the vertical axis represents the radial positions of the peaks 61 of the female thread portion 6 and the valleys 262 of the male thread portion 26, respectively.

[0074] In the diagram, the radial position of the crest 61 of the female screw portion 6 changes inward in a stepwise manner at Θ=Θ5 (for example, Θ5=5π / 4 to 3π / 2rad). The radial position of the crest 61 of the female screw portion 6 is maintained constant from Θ=Θ5 over a certain azimuth angle range, and then changes gradually inward in a linear (or curvilinear) manner as the azimuth angle Θ increases, returning to its original position at Θ=Θ6 (for example, Θ6=7π / 4 to 2πrad).

[0075] In the diagram, the radial position of the valley 262 of the male thread portion 26, represented by a solid line, is constant radially inward from the radial position of the crest 61 of the female thread portion 6 within the azimuth angle range Θ=0 to Θ7 (for example, Θ7=π to 9π / 8rad). The radial position of the valley 262 of the male thread portion 26 changes relatively smoothly and linearly (or curvilinearly) radially outward as the azimuth angle Θ increases from Θ=Θ7, reaching a position radially outward from the innermost radial position of the crest 61 of the female thread portion 6 at Θ=Θ8 (for example, Θ8=19π / 16 to 5π / 4rad). At Θ=Θ8, the radial position of the valley 262 of the male thread portion 26 changes radially inward in a stepwise manner, returning to its original position (the position at Θ=Θ7). The radial position of the groove 262 of the male screw portion 26 is constant in the azimuth angle range beyond Θ=Θ8.

[0076] In the upper diagram of Figure 4, the locally convex curved protrusion in the azimuth angle range Θ=Θ3~Θ4 corresponds to the projection 27. A portion of the projection 27 abuts against the valley 62 of the female thread portion 6, causing the male thread portion 26 and the female thread portion 6 to be pressed together more strongly at the projection 27 than at other parts. This increases the resistance force when rotating the male thread portion 26 in the unscrew direction relative to the female thread portion 6, thereby preventing the adapter 20 from falling out of the blood collection holder 3.

[0077] In this embodiment, the protrusion 27 is formed in the azimuth angle range Θ=Θ3 to Θ4, but it is not limited to this, and even if it is formed in the azimuth angle range Θ=0 to 3π, it is sufficient as long as the male threaded portion 26 and the female threaded portion 6 are pressed more strongly against the protrusion 27 than other parts.

[0078] Furthermore, the projection direction of the protruding portion 27 is not limited to the radially outward direction, and as shown in Figures 5 and 6, it may be formed to be locally wider in a direction parallel to the central axis at a predetermined azimuth angle position around the central axis of the male screw portion 26.

[0079] In this embodiment, the protrusions 27 are locally widened so as to extend in both directions parallel to the central axis, but the protrusions 27 may also be locally widened so as to extend in one direction parallel to the central axis. The three protrusions 27 are formed at three circumferential positions with an azimuth angle Θ shifted by 2π so as to be aligned in the direction of the central axis, but there may be only one, and the circumferential positions may be arbitrarily changed.

[0080] Furthermore, the protrusion may be formed on a part of the crest 61 of the female thread portion 6. In this case, for example, the protrusion is formed so that a part of the protrusion abuts against a part of the male thread portion 26, facing radially inward. As a result, the male thread portion 26 and the female thread portion 6 are pressed more strongly against each other than other parts in the azimuth angle range in which the protrusion is provided. Therefore, the resistance force when rotating the male thread portion 26 in the unscrew direction relative to the female thread portion 6 can be increased, and the adapter 20 can be prevented from falling out of the blood collection holder 3.

[0081] In the adapter of the present invention, it is preferable that the protruding portion 27 is formed between Θ = 0 and 1.5πrad. In other words, it is preferable that the male thread portion 26 or the female thread portion 6 be formed closer to the tip than the middle portion of the spiral stroke.

[0082] As a result, when the male thread portion 26 is rotated in the unthreading direction relative to the female thread portion 6, the male thread portion 26 and the female thread portion 6 are pressed more strongly against each other at the protrusion portion 27 over a longer stroke compared to when the protrusion portion 27 is formed at a position of Θ = 1.5πrad or more.

[0083] It is preferable that the adapter 20 is made of a material that has a higher load deflection temperature (also called thermal deformation temperature) than the mounting portion 4.

[0084] For example, the adapter 20 is made of rigid polyvinyl chloride, and the mounting part 4 is made of polypropylene. The temperature of deflection under load can be measured by a method in accordance with JIS K7191.

[0085] In addition to rigid polyvinyl chloride, the adapter 20 can be made from materials such as polypropylene, acrylic resin, acrylonitrile, butadiene, styrene resin, polyacetal, and polycarbonate.

[0086] According to this configuration, for example, because the adapter is made of a material with a higher load deflection temperature than the mounting portion due to the thermal cycle of heating and cooling during the manufacturing process, the mounting portion 4 undergoes greater thermal contraction than the extended portion 23 of the adapter 20.

[0087] This allows for a more robust contact between the female threaded portion 6 and the male threaded portion 26 in the protruding portion 27.

[0088] Furthermore, the portion of the mounting part 4 that comes into contact with the protruding part 27 undergoes a heat treatment and deforms in the direction of the pressure applied. The protruding portion 27 then acts as an anchor, catching on the deformed area.

[0089] Therefore, the adapter 20 can be further prevented from falling out of the blood collection holder 3.

[0090] In the adapter 20 described above, as shown in Figure 2, a projection 30 is formed in a part of the valley of the male thread portion 26, projecting radially outward. When the male thread portion 26 is screwed into the female thread portion 6 formed in the mounting portion 4, the tip of the projection 30 is located radially outward from the peaks of the female thread portion 6 and radially inward from the valleys of the female thread portion 6 (see Figures 4 and 7). Preferably, the peaks 61 of the female thread portion 6 are formed intermittently in the circumferential direction.

[0091] Furthermore, a projection 30 is formed in a part of the valley of the female thread portion 6, projecting radially inward. When the male thread portion 26 is screwed into the female thread portion 6 formed in the mounting portion 4, the tip of the projection 30 is located radially inward from the peaks of the male thread portion 26 and radially outward from the valleys of the male thread portion 26. The peaks 261 of the male thread portion 26 may be formed intermittently in the circumferential direction.

[0092] In the diagram at the bottom of Figure 4, the locally raised portion in the azimuth angle range Θ=Θ5~Θ6 corresponds to the crest 61 of the female screw thread.

[0093] Next, in the diagram at the bottom of Figure 4, the locally raised portion in the azimuth angle range Θ=Θ7~Θ8 corresponds to the protrusion 30.

[0094] Therefore, when the male thread portion 26 is rotated relative to the female thread portion 6, the projection portion 30 comes into contact with the crest 61 of the female thread portion, thereby suppressing its rotation.

[0095] As shown in Figure 4, in this embodiment, the shape of the projection 30 is wedge-shaped and formed in the azimuth angle range Θ = Θ7 to Θ8. However, if the projection 30 contacts the threads 61 of the female screw portion, it may be formed in the azimuth angle range Θ = 0 to 3π, and its shape and size are not limited. Furthermore, the projection 30 may not be formed at all.

[0096] Next, the crests 61 of the female thread portion 6 are intermittently formed in the azimuth angle range Θ=Θ5~Θ6. However, the crests 61 of the female thread portion 6 are not limited to the position in the azimuth angle range Θ=Θ5~Θ6, and can be formed in the azimuth angle range Θ=0~3π as long as they can be screwed into the male thread portion 26.

[0097] Furthermore, it is preferable that the projection 30 has an inclined surface that guides the cut end portion 612 of the female thread portion 6 and a locking surface that engages the cut end portion 611 of the female thread portion 6.

[0098] The correspondence between the inclined surface 301 and locking surface 302 formed on the projection 30 when the male threaded portion 26 and the female threaded portion 6 are rotated in the screwing or unscrewing direction, and the cut ends 611 and 612 of the threads 61 of the female threaded portion 6 will be explained.

[0099] Figure 8 shows the shape profiles of the peaks 261 and valleys 262 of the spirally extending male thread portion 26, and the peaks 61 and valleys 62 of the female thread portion 6, along the respective helical curves. Figure 8 shows the male thread portion 26 being rotated in the screwing direction relative to the female thread portion 6.

[0100] As the male thread portion 26 and the female thread portion 6 are rotated relative to each other in the screwing direction from a non-screwed state (see arrow A in Figure 8), the cut end portion 612 of the peak 61 of the female thread portion 6 comes into contact with the inclined surface 301 of the projection 30 of the valley 262 of the male thread portion 26, as shown in Figure 8.

[0101] Here, the inclined surface 301 of the projection 30 and the cut end portion 612 of the crest 61 of the female thread portion 6 are inclined relatively sharply with respect to the relative rotational force vector in the threading direction between the male thread portion 26 and the female thread portion 6. Therefore, if the male thread portion 26 and the female thread portion 6 are further rotated relative to each other in the threading direction from the state shown in Figure 8, a portion of this rotational force is converted into a force that guides the inclined surface 301 of the projection 30 radially inward along the cut end portion 612 of the crest 61 of the female thread portion 6. As a result, the inclined surface 301 of the projection 30 can easily overcome the cut end portion 612 of the crest 61 of the female thread portion 6.

[0102] Thus, when screwing the male thread portion 26 and the female thread portion 6 together, the threads 61 of the female thread portion can easily overcome the projection 30. Finally, as shown in Figure 4, the male thread portion 6 and the female thread portion 26 can be fully screwed together.

[0103] In this embodiment, since the azimuth angles Θ=Θ1~7 of one of the two threads coincide, the threads 61 of the female threads of one thread and the other thread cross over the respective projections 30 at the same time.

[0104] However, the azimuth angles Θ=Θ5~8 of one threaded screw and the other threaded screw do not coincide, and the timing at which the peaks 61 of the female thread of one threaded screw cross over the projection 30 may be earlier or later than the timing at which the peaks 61 of the female thread of the other threaded screw cross over the projection 30.

[0105] Furthermore, in this embodiment, the inclination angle of the inclined surface 301 of the projection 30 is set to approximately 40 degrees, but it is not limited to this, and it is sufficient as long as the threads 61 of the female screw portion 6 are inclined in a way that allows them to overcome the projection 30.

[0106] Figure 9 shows the shape profiles of the peaks 261 and valleys 262 of the spirally extending male thread portion 26, and the peaks 61 and valleys 62 of the female thread portion 6, along the respective helical curves. Figure 9 shows the male thread portion 26 being rotated in the unthreading direction relative to the female thread portion 6.

[0107] As the male thread portion 26 and the female thread portion 6 are rotated relative to each other in the unscrew direction from a state in which they are fully screwed together (see Figure 4) (see arrow B in Figure 9), the cut end portion 611 of the peak 61 of the female thread portion 6 comes into contact with the locking surface 302 of the projection 30 of the valley 262 of the male thread portion 26, as shown in Figure 9.

[0108] At this time, the locking surface 302 of the projection 30 of the valley 262 of the male thread portion 26 changes in a stepwise manner radially inward at Θ=Θ8 and returns to its original position (position at Θ=Θ7), and the cut end portion 611 of the crest 61 of the female thread portion 6 changes in a stepwise manner radially inward at Θ5. Therefore, the projection 30 and the crest 61 of the female thread portion 6 can come into contact with the locking surface 302 of the projection 30 and the cut end portion 611 of the crest 61 of the female thread portion 6, which extend perpendicular or nearly perpendicular to the force vector that rotates the male thread portion 26 and the female thread portion 6 relative to each other in the unthreading direction. As a result, the crest 61 of the female thread portion 6 is less likely to overtake the projection 30 of the valley 262 of the male thread portion 26.

[0109] Therefore, it is possible to suppress the rotation of the male threaded portion 26 in the unthreading direction relative to the female threaded portion 6.

[0110] In this embodiment, since the azimuth angles Θ=Θ1~7 of one of the two threads coincide, the threads 61 of the female threads of one thread and the other thread come into contact with their respective projections 30 at the same time.

[0111] However, the azimuth angles Θ=Θ5~8 of one threaded screw and the other threaded screw do not coincide, and the timing at which the peaks 61 of the female thread of one threaded screw contact the projection 30 may be earlier or later than the timing at which the peaks 61 of the female thread of the other threaded screw contact the projection 30.

[0112] In this embodiment, the locking surface 302 of the projection 30 is formed by a stepwise change inward in the radial direction at Θ=Θ8, but is not limited to this, as long as the male thread portion 26 is prevented from rotating in the unthreading direction relative to the female thread portion 6 by contacting the cut end portion 611 of the crest 61 of the female thread portion 6, then it is acceptable.

[0113] Furthermore, the cut ends 611 and 612 of the threads 61 of the female screw portion 6 may have an inclined surface to guide the projection 30 and a locking surface to lock the projection 30.

[0114] The inclined surface is formed at the end portion 612 of the female screw portion 6 on the side with a large azimuth angle of the threads 61, and the locking surface is formed at the end portion 611 of the female screw portion on the side with a small azimuth angle of the threads 61.

[0115] If the projection 30 is formed to protrude radially inward from a part of the valley 62 of the female thread portion 6, it is preferable that the projection 30 has an inclined surface that guides the cut end of the peak 261 of the male thread portion 26 and a locking surface that engages the cut end of the peak 261 of the male thread portion 26.

[0116] The inclined surface is formed on the side where the azimuth angle of the projection is large, and the locking surface is formed on the side where the azimuth angle of the projection is small.

[0117] Furthermore, the cut end of the male threaded portion 26 may have an inclined surface for guiding the projection 30 and a locking surface for locking the projection.

[0118] The inclined surface is formed at the end of the male threaded portion 26 on the side with a smaller azimuth angle, and the locking surface is formed at the end of the male threaded portion 26 on the side with a larger azimuth angle.

[0119] As described above, the adapter 20 of the present invention provides an adapter 20 that is less likely to fall off the blood collection holder 3 by suppressing the rotation of the adapter 20 relative to the blood collection holder 3.

[0120] In this embodiment, the blood collection device 40 is a winged needle, but it is not limited to this, and a single needle tube may be used as long as blood can be collected. [Explanation of symbols]

[0121] 3. Blood collection holder 4. Mounting part 7 Bottom 8 Tip surface 9 Through hole 20 adapters 21 Main body 22 Flange section 23 Extension

Claims

1. An adapter that is attached to a mounting part provided at the bottom of a closed-bottom cylindrical blood collection holder, which has a female threaded portion on the inner circumferential surface of a through hole that partitions the through hole, The aforementioned adapter can be connected to a blood collection device used to collect blood from the human body and has a hollow main body through which the collected blood flows, A flange portion provided on the base end side of the main body portion and in contact with the tip surface of the mounting portion, It comprises a cylindrical extending portion that extends from the flange portion in the direction opposite to the main body portion and is inserted into the through hole of the mounting portion, A male threaded portion is formed on the outer circumference of the extended portion. An adapter characterized in that the male thread portion and the female thread portion are pressed together more strongly at the protruding portion than at other parts, by having a protrusion that locally projects radially outward from a part of the crest or valley of the male thread portion or a part of the crest or valley of the female thread portion, or in the direction of the central axis of the male thread portion or the female thread portion.

2. The adapter according to claim 1, An adapter in which the protrusion is formed closer to the tip than the middle of the spiral stroke of the male screw portion or closer to the tip than the middle of the spiral stroke of the female screw portion.

3. The adapter according to claim 1, The adapter is made of a material that has a higher load deflection temperature than the mounting portion.

4. The adapter according to claim 1, The female thread portion is formed intermittently in the circumferential direction. A projection is formed in a part of the valley of the male screw portion, which protrudes radially outward. The tip of the projection is located radially outward from the crest of the female screw portion and radially inward from the valley of the female screw portion.

5. The adapter according to claim 4, The protruding portion is formed with an inclined surface that guides the cut end of the female thread when screwing the male thread and the female thread, and a locking surface that engages the cut end of the female thread when unscrewing the male thread and the female thread, or An adapter having an inclined surface that guides the projection when screwing the male thread portion and the female thread portion together, and a locking surface that engages the projection when unscrewing the male thread portion and the female thread portion together, formed at the cut end of the female thread portion.

6. The adapter according to claim 1, The aforementioned male screw portion is formed intermittently in the circumferential direction. A projection is formed in a part of the valley of the female screw portion, which protrudes radially inward. The tip of the projection is located radially inward from the crest of the male screw portion and radially outward from the valley of the male screw portion.

7. The adapter according to claim 6, The projection has an inclined surface that guides the cut end of the male thread when the male thread and female thread are screwed together, and the projection has a locking surface that engages the cut end of the male thread when the male thread and female thread are screwed together, or An adapter having an inclined surface formed at the cut end of the male thread portion for guiding the projection when screwing the male thread portion and the female thread portion together, and a locking surface formed at the cut end of the male thread portion for engaging the projection when unscrewing the male thread portion and the female thread portion together.

8. The adapter according to claim 1 to claim 7, The aforementioned blood collection device, The aforementioned blood collection holder, A blood collection kit that includes a blood collection tube for collecting blood.

9. It is an adapter, The adapter comprises a hollow main body and A flange portion provided on the base end side of the main body, It comprises a cylindrical extension portion that extends from the flange portion in the direction opposite to the main body portion, A male threaded portion is formed on the outer circumference of the extended portion. From a part of the crest or valley of the male thread portion, radially outward or in the direction of the central axis of the male thread portion An adapter characterized by having a locally protruding portion.

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