blood collection tube holder

Abstract

To achieve stable fixation of a hub and a holder body in a blood sampling tube holder by making a problem that the hub inclines minutely and a blade tip is not located at an appropriate position hard to occur.SOLUTION: A blood sampling tube holder 10 includes: a cylindrical resin holder body 12; and a resin hub 40 having a blood sampling needle fixed thereto, and fixed to the inside of the holder body 12, wherein a blood sampling tube is detachably mounted to the holder body 12. The hub 40 has a male screw part on an outer peripheral surface. The holder body 12 has a female screw part that can be screwed into the male screw part in an end on the opposite side of a mounting side of the blood sampling tube. The hub 40 and the holder body 12 have a molten part in which resins of the hub 40 and the holder 12 are molten in a state where the female screw part is screwed into the male screw part. The holder body 12 has an outer cylinder, and an inner cylinder connected to the inside of the outer cylinder via a rib provided in a part in a peripheral direction. The molten part is formed by the inner cylinder and the hub 40 in the inner periphery of the inner cylinder at a position facing the rib via the inner cylinder.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a blood collection tube holder for holding a blood collection tube used for blood collection and a method for manufacturing the same.

Background Art

[0002] Conventionally, when collecting blood from a patient, blood is collected in a blood collection tube, and in this case, generally, a blood collection tube holder for holding the blood collection tube is used.

[0003] Patent Document 1 discloses a blood collection tube holder including a cylindrical resin holder body and a resin hub to which a blood collection needle is fixed and which is fixed inside the holder body, and the blood collection tube is detachably attached to the holder body. In this blood collection tube holder, the hub and the holder body are each formed of a heat-welding resin and are heat-welded (ultrasonic welded) by ultrasonic sealing or the like.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] There are blood collection tube holders in which the blood collection needle and the holder body are fixed by screws, but it has been confirmed that the screws are deformed by vibrations or external pressures generated during transportation or the like, and the fixing is released, and another fixing technique has been studied. As another fixing technique, there is a means such as welding as in Patent Document 1. However, since the welding technique involves the melting of the resins with each other, it is difficult to stably fix the hub and the holder body, and due to the deviation of the welding, problems such as the hub being slightly tilted and the cutting edge not being positioned at an accurate position may occur.

[0006] An object of the present invention is to provide a blood collection tube holder capable of solving the above problems and a method for manufacturing the same. [Means for solving the problem]

[0007] A blood collection tube holder according to one aspect of the present invention comprises a cylindrical resin holder body and a resin hub to which a blood collection needle is fixed and which is fixed to the inside of the holder body, and is a blood collection tube holder for attaching a blood collection tube to the holder body in a detachable manner, wherein the hub has a male screw portion on its outer circumference, and the holder body has a female screw portion at the end opposite to the side on which the blood collection tube is attached that can be screwed into the male screw portion, and the hub and the holder body have a molten portion where the resins of each are molten when the female screw portion is screwed into the male screw portion.

[0008] According to the above configuration, the hub and the holder body are positioned appropriately by the screw connection, and then fixed together by the molten portion. As a result, problems such as the hub tilting slightly and the cutting edge not being positioned correctly are less likely to occur, and stable fixing between the hub and the holder body can be achieved.

[0009] In a blood collection tube holder according to one aspect of the present invention, the molten portion may be configured as a point weld, where the hub and the holder body are welded together in a portion of the outer circumferential and axial directions on the outer surface of the hub.

[0010] With the above configuration, by using the welding point as the focal point, it is less likely that the blade tip will tilt due to excessive melting during welding, and the hub and holder body can be stably fixed.

[0011] In the above configuration, the point welding may be configured such that the hub and the holder body are welded together at the screw connection between the male screw portion and the female screw portion.

[0012] The above configuration makes it easier to reliably prevent the screw connection from loosening due to deformation of the male and female screw sections. This further improves the joint strength between the holder body and the hub. In addition, it makes it easier to temporarily fix the hub and holder body with screws when performing welding work, thus improving the work efficiency of joining the hub and holder body.

[0013] A blood collection tube holder according to one aspect of the present invention comprises a cylindrical holder body and a hub to which a blood collection needle is fixed and which is fixed to the inside of the holder body, and is a blood collection tube holder for which a blood collection tube is detachably attached to the holder body, wherein the holder body has an outer cylinder and an inner cylinder connected to the outer cylinder via ribs provided on a part of the circumferential direction inside the outer cylinder, the hub is disposed inside the inner cylinder, and the inner cylinder and the hub have a molten portion where the resins of each are melted at the inner circumference of the inner cylinder at a position facing the ribs via the inner cylinder.

[0014] With the above configuration, the presence of an outer cylinder makes it difficult for external pressure to be applied to the inner cylinder and hub, thereby suppressing the hub from detaching during transport. Moreover, ribs are provided between the outer cylinder and the inner cylinder, and the hub and inner cylinder are welded and fixed in place at predetermined positions, allowing the holder body and hub to be stably fixed. As a result, problems such as the hub tilting slightly and the cutting edge not being positioned correctly are less likely to occur.

[0015] In the above configuration, the hub may have a male threaded portion on its outer circumferential surface, and the holder body may have a female threaded portion on the inner circumferential surface of the end opposite to the side where the blood collection tube is attached, which can be screwed into the male threaded portion, and the male threaded portion may be screwed into the female threaded portion.

[0016] According to the above configuration, the hub and the holder body are positioned appropriately by the screw connection, and then fixed together by the molten portion. As a result, problems such as the hub tilting slightly and the cutting edge not being positioned correctly are less likely to occur, and more stable fixing between the hub and the holder body can be achieved.

[0017] In the above configuration, the molten portion may be configured such that the hub and the holder body are welded together at the screw connection portion between the male screw portion and the female screw portion.

[0018] The above configuration makes it easier to reliably prevent the screw connection from loosening due to deformation of the male and female screw sections. This further improves the joint strength between the holder body and the hub. In addition, it makes it easier to temporarily fix the hub and holder body with screws when performing welding work, thus improving the work efficiency of joining the hub and holder body.

[0019] In the above configuration, the molten portion may be configured to weld the hub and the holder body at the axial center position of the screw connection between the female screw portion and the male screw portion, or at the holder body on the side of the holder body where the blood collection tube is attached, from the axial center position.

[0020] With the above configuration, even if a container for protecting the blood collection needle can be attached to the end of the holder body opposite to the side where the blood collection tube is attached, it becomes easier to prevent the container from being heat-sealed to the holder body during the welding process.

[0021] A method for manufacturing a blood collection tube holder according to one aspect of the present invention comprises a cylindrical holder body and a hub to which a blood collection needle is fixed and which is fixed to the inside of the holder body, and is a method for manufacturing a blood collection tube holder for which a blood collection tube is detachably attached to the holder body, wherein the holder body has an outer cylinder and an inner cylinder connected to the outer cylinder via ribs provided on a part of the circumferential direction on the inside of the outer cylinder, the hub is placed inside the inner cylinder, and an ultrasonic horn is applied to the outer circumferential surface of the outer cylinder to the portion where the ribs are located on the inside, thereby welding the hub and the holder body by ultrasonic welding.

[0022] According to the above configuration, the presence of the outer cylinder can make it difficult for external pressure to be applied to the inner cylinder and the hub, and can suppress the detachment phenomenon of the hub during transportation. Moreover, ribs are provided between the outer cylinder and the inner cylinder, and the hub and the inner cylinder are welded and fixed at a predetermined position, so that the holder body and the hub can be stably fixed. As a result, problems such as the hub tilting slightly and the cutting edge not being positioned accurately are less likely to occur.

[0023] In the above configuration, the hub may have a flange that protrudes radially outward in a part in the axial direction, and before fixing the hub to the holder body by the welding, the hub may be axially positioned with respect to the holder body by bringing the side surface of the flange into contact with the holder body.

[0024] According to the above configuration, before performing the welding operation, the hub can be easily positioned with respect to the holder body, so that the welding operation between the holder body and the hub is easy to perform.

Effect of the Invention

[0025] According to the blood collection tube holder and the method for manufacturing the blood collection tube holder according to the present invention, problems such as the hub tilting slightly and the cutting edge not being positioned accurately are less likely to occur, and stable fixing between the hub and the holder body can be realized.

Brief Description of the Drawings

[0026] [Figure 1] It is a cross-sectional view showing a state before fixing the blood collection needle of the blood collection tube holder of the embodiment. [Figure 2] It is an enlarged view of part A in FIG. 1. [Figure 3] In FIG. 1, it is a view showing a state where a container is attached to the blood collection tube holder. [Figure 4] It is a perspective view of the holder body constituting the blood collection tube holder of FIG. 1. [Figure 5] It is an enlarged perspective view seen from the tip side of the holder body of FIG. 4. [Figure 6] It is a view seen in the direction of arrow B in FIG. 5. [Figure 7]This is a view of the holder body from the tip side of Figure 4. [Figure 8] This is an enlarged view of section C in Figure 7. [Figure 9] This is a diagram showing the DD cross-section, as shown in Figure 5. [Figure 10] Figure 5 is a perspective view taken at the EE section. [Figure 11] Figure 7 shows a cross-sectional view of FF (a) and an enlarged view of section G of (a) (b). [Modes for carrying out the invention]

[0027] Hereinafter, an example of an embodiment of the blood collection tube holder and its manufacturing method according to the present invention will be described in detail with reference to the drawings. The embodiment described below is merely an example, and the present invention is not limited to the embodiments described below.

[0028] Figure 1 is a cross-sectional view showing the blood collection tube holder 10 of the embodiment before the blood collection needle is fixed. Figure 2 is an enlarged view of part A in Figure 1. Figure 3 is a diagram showing the state in Figure 1 with the container 100 attached to the blood collection tube holder 10.

[0029] As shown in Figures 1 to 3, the blood collection tube holder 10 includes a cylindrical resin holder body 12 and a resin hub 40 fixed to the inside of the tip of the holder body 12 (the left end in Figures 1 and 3). The blood collection tube holder 10 is used to hold the blood collection tube 102 (Figure 4) by attaching the blood collection tube 102 to the inside from the proximal end (the right end in Figures 1 and 3) of the holder body 12. Both the holder body 12 and the hub 40 are made of a resin such as a thermoplastic resin suitable for heat welding.

[0030] The hub 40 has a blood collection needle 80 (Figure 3) fixed through its center, with both the tip and proximal ends of the blood collection needle 80 protruding from both ends of the hub 40. In Figure 3, the illustration of the blood collection needle protruding from the proximal end of the hub 40 is omitted. The tip of the blood collection needle 80 also protrudes from the tip of the holder body 12. The blood collection tube holder 10 has a blood collection tube 102 attached to the inside when in use. During blood collection, the tip of the blood collection needle 80 is punctured into the patient's skin by a doctor, nurse, etc., and blood flows into the blood collection needle 80. Next, the blood collection tube 102 is inserted into the holder body 12 from the proximal end, the tip of the proximal end of the blood collection needle 80 comes into contact with the rubber stopper of the blood collection tube 102, and by further pushing the blood collection tube 102, the tip of the needle penetrates the rubber stopper and blood is collected into the blood collection tube 102. Furthermore, used blood collection needles 80 are covered and protected by a container 100 attached to the inside of the tip of the holder body 12, as shown in Figure 3.

[0031] The components of the blood collection tube holder 10 will be explained in detail. Figure 4 is a perspective view of the holder body 12 that makes up the blood collection tube holder 10. Figure 5 is an enlarged perspective view of the holder body 12 seen from the tip side. Figure 6 is a view taken along arrow B in Figure 5. Figure 7 is a view of the holder body 12 in Figure 4 seen from the tip side.

[0032] The holder body 12 includes a main cylindrical portion 13 and a holding portion 16 that is smaller in diameter and substantially cylindrical than the main cylindrical portion 13 and connected to the tip side of the main cylindrical portion 13, to which the hub 40 can be fixed inside. The main cylindrical portion 13 expands in diameter towards the base end. The holding portion 16 has a cylindrical outer cylinder 17 and a cylindrical inner cylinder 19 provided inside the outer cylinder 17 from the axial middle to the base end, and a female screw portion 20, which is a substantially semicircular double thread, is formed near the axial center of the inner circumferential surface of the inner cylinder 19.

[0033] Multiple longitudinal ribs 14 are formed at multiple circumferential positions on the outer surface of the main cylindrical portion 13, extending in the longitudinal direction for reinforcement. A flange 15 is formed to protrude from the outer surface of the base end of the main cylindrical portion 13. The flange 15 has a longer protruding direction in a first linear direction along a plane perpendicular to the axial direction of the main cylindrical portion 13, and a shorter protruding direction in a second linear direction perpendicular to the first direction along that plane.

[0034] The shape of the holding portion 16 will be described in more detail. Figure 8 is an enlarged view of section C in Figure 7. Figure 9 is a view of the DD cross section in Figure 5. Figure 10 is a perspective view taken at the EE cross section in Figure 5. Figure 11(a) is a cross section of FF in Figure 7, and Figure 11(b) is an enlarged view of section G in Figure 11(a).

[0035] As shown in Figure 8, in the holding portion 16 of the holder body 12, the inner cylinder 19 is connected to the outer cylinder 17 via ribs 23, 24 provided on the inside of a part of the circumferential direction, more specifically, at four positions with approximately 90-degree phase differences. The inner cylinder 19 has a screw that engages with the hub, enabling a stable connection to the hub. The outer cylinder 17 is configured to surround the inner cylinder 19, preventing external pressure such as the user's fingers from being applied to the hub and inner cylinder. The four ribs 23, 24 are formed to connect the inner cylinder 19 and the outer cylinder 17, and consist of two first ribs 23 facing each other in a first direction and two second ribs 24 facing each other in a second direction perpendicular to the first direction. The two first ribs 23 facing each other in the first direction efficiently transmit the vibrations of the ultrasonic horn applied to the outer cylinder 17 to the inner cylinder 19, and have the function of assisting ultrasonic welding of the inner cylinder 19 and the hub. The two second ribs 24 facing each other in the second direction have the function of suppressing deformation of the inner cylinder when the hub is inserted into the inner cylinder 19, thereby improving stability during ultrasonic welding. Of the two first ribs 23, the circumferential width d1 of the radial inner end of at least one of the first ribs 23 on the side where the molten portion 50 (Figure 2) described later is formed (upper side of Figure 8) is longer than the circumferential width d2 of the radial inner ends of each of the two second ribs 24. This allows for a larger joint between the hub and the inner cylinder 19, ensuring reliable welding. In addition, the threads provided on the hub and inner cylinder are designed so that the cutting surface faces the second direction when screwed in, and the hub is fixed to the inner cylinder so that the angle between the needle and the skin during puncture does not become large. The two second ribs 24 act to support the needle during puncture, making it less likely for the needle to bend during puncture. Note that the ribs for efficiently transmitting the vibrations of the ultrasonic horn to the inner cylinder 19 are not limited to the first direction, but may be in the second direction or another direction. By using the ribs, when welding the inner cylinder 19 to the hub 40 (Figures 1 and 2) located inside the inner cylinder 19 using ultrasonic vibration, the ultrasonic vibrations are more easily transmitted from the holding part 16 to the hub 40, making it easier to form a molten portion 50 at a predetermined position on the inner cylinder 19 and the hub 40.

[0036] Furthermore, in the substantially arc-shaped holes 25 formed between the four ribs 23 and 24, one end edge of the holes at both ends of each first rib 23 is substantially aligned with a second direction perpendicular to the first direction, which is the direction in which the first rib 23 protrudes from the inner cylinder 19. As a result, each first rib 23 has a substantially T-shape that widens radially outward when viewed in the axial direction of the holder body 12. Note that the circumferential length of the radially inner end of each first rib 23 may be substantially the same as the circumferential length of the radially outer end.

[0037] Of the two first ribs 23, one first rib is welded to the hub 40 by ultrasonic welding. Therefore, the holder body 12 and the hub 40 are fixed inseparably. The other first rib 23 (the lower one in Figure 8), like the first rib, has a circumferential width that is greater than the circumferential width of the two second ribs. This is to ensure that either first rib can be used as the welding side during the welding process. Furthermore, when ultrasonically welding one first rib to the hub 40, the other first rib makes it easier to support the hub 40, allowing for stable ultrasonic welding. In this embodiment, only one first rib is welded to the hub 40, but both first ribs 23 may be welded to the hub 40.

[0038] As shown in Figure 2, the hub 40 has a polygonal prism-shaped tip portion 41, an intermediate shaft portion 42 with a male threaded portion 43 formed on its outer circumference, a small-diameter base shaft portion 44 protruding from the base end face of the intermediate shaft portion 42, and an outward-facing flange 41a formed at the base end of the tip portion 41, and the entire structure is formed in a columnar shape. The blood collection needle 80 (Figure 3) is fixed through the center of the hub 40.

[0039] Then, the intermediate shaft portion 42 is positioned inside the inner cylinder 19 of the holder body 12, the flange 41a is abutted against the end face of the inner cylinder 19 for positioning, and the male threaded portion 43 of the intermediate shaft portion 42 is screwed into the female threaded portion 20 of the inner cylinder 19. In this state, the holder body 12 and the hub 40 have a molten portion 50 where the resins of the inner cylinder 19 and the outer circumference of the hub 40 are fused together. The molten portion 50 is a portion of the holder body 12, indicated by point P in Figure 8, where ultrasonic vibrations are easily transmitted from the inner cylinder 19 to the hub 40, and it coincides with the phase of the circumferential center of one of the first ribs 23 on the inner circumference of the inner cylinder 19. As shown in Figure 2, it is formed at the contact point between the male threaded portion 43 and the female threaded portion 20 in the axial direction of the hub 40.

[0040] Furthermore, the molten portion 50 welds the hub 40 and the holder body 12 at the axial center position of the screw connection portion 52 (Figures 1-3) between the female screw portion 20 and the male screw portion 43. This makes it easier to reliably prevent the screw connection from loosening due to deformation of the male and female screw portions. This further improves the bonding strength between the holder body and the hub. Also, it makes it easier to temporarily fix the hub and the holder body with screws when performing the welding work, thus improving the workability of the joining work between the hub and the holder body. In Figure 2, arrow L1 indicates the formation range of the screw connection portion 52 in the axial direction of the hub 40 and the holder body 12. As a result, the molten portion 50 is a point weld in which the hub 40 and the holder body 12 are welded at a point-like portion that is a part of the outer circumferential and axial directions of the outer surface of the hub 40. Point welding reduces the situation in which excessive resin melting causes the needle to affect the position of the hub and the needle. The molten portion 50 is formed between the inner cylinder 19 and the hub 40, where the resins of both are melted on the inner circumference of the inner cylinder 19 at a position facing the rib 23 via the inner cylinder 19.

[0041] In Figure 2, the molten portion 50 welds the hub 40 and the holder body 12 at the axial center position of the screw joint portion 52. However, the molten portion may also weld the hub 40 and the holder body 12 at the side of the holder body 12 where the blood collection tube is attached (right side in Figure 2), rather than at this axial center position.

[0042] Furthermore, the molten portion 50 is not limited to being formed only at the position shown in Figure 2, but may also be formed in the vicinity of point P in Figure 8, near the axial center position of the screw coupling portion 52, and on a portion extending in the circumferential direction of the hub 40 and holder body 12 where the male screw portion 43 and the female screw portion 20 come into contact.

[0043] In this example, a flange 41a is formed on the hub 40, but the flange 41a is for positioning the hub 40 relative to the holder body 12. Therefore, if the axial positioning of the hub 40 relative to the holder body 12 can be achieved by other means, such as screw coupling, the flange may be omitted.

[0044] Furthermore, the holder body may have an outer cylinder and an inner cylinder connected to the outer cylinder via ribs provided on a part of the circumferential direction inside the outer cylinder, and the other first rib 23 on the opposite side from the side where the molten portion 50 is formed, and each second rib 24 may be omitted. On the other hand, as in this example, by forming the other first rib 23, the portion of the inner cylinder 19 opposite to the side to which the ultrasonic horn is applied can be supported by the outer cylinder 17 via the other first rib 23, so that the molten portion 50 can be formed more stably in the predetermined position.

[0045] The manufacturing method for the blood collection tube holder 10 will be described in more detail. In this manufacturing method, the holder body 12 is held in place by a fixing part (not shown) with the longer side of the flange 15 aligned with the first direction, which is the vertical direction. With the tip of an ultrasonic horn (not shown) touching the upper end of the outer cylinder, indicated by arrow α in Figures 1 and 2, from above, ultrasonic vibration is performed to weld and fix the hub 40 and the holder body 12 by ultrasonic welding. At this time, the contact position of the ultrasonic horn with respect to the outer cylinder 17 is at the axial center position of the screw coupling part 52 in the axial direction of the outer cylinder 17, or on the side of the holder body 12 where the blood collection tube is attached (right side in Figures 1 and 2) from this axial center position.

[0046] Before fixing the hub 40 to the holder body 12 by ultrasonic welding, the hub 40 is positioned axially relative to the holder body 12 by bringing the side surface of the flange 41a into contact with the holder body 12.

[0047] According to the blood collection tube holder 10 and its manufacturing method described above, when the hub 40 and the holder body 12 are joined, problems such as the hub 40 tilting slightly and the cutting edge not being positioned correctly are less likely to occur, and stable fixing between the hub 40 and the holder body 12 can be achieved.

[0048] Specifically, the hub 40 and the holder body 12 are positioned appropriately by the screw connection, and then the hub 40 and the holder body 12 are fixed together by the molten portion 50. As a result, problems such as the hub 40 tilting slightly and the cutting edge not being positioned correctly are less likely to occur, and stable fixing of the hub 40 and the holder body 12 can be achieved.

[0049] Furthermore, the molten portion 50 is a point weld where the hub 40 and the holder body 12 are welded together in a portion of both the circumferential and axial directions on the outer surface of the hub 40. By making the molten portion 50 a point, it is less likely that excessive melting will occur during welding, and the hub 40 and the holder body 12 can be stably fixed. Alternatively, the molten portion 50 may be a point weld where the hub 40 and the holder body 12 are welded together in a portion of only one of the circumferential and axial directions on the outer surface of the hub 40. In this case as well, the hub 40 and the holder body 12 can be stably fixed by the molten portion 50.

[0050] Furthermore, point welding welds the hub 40 and the holder body 12 at the screw connection portion 52. This makes it easier to reliably prevent the screw connection from loosening due to deformation of the male screw portion 43 and the female screw portion 20 during point welding. As a result, the joint strength between the holder body 12 and the hub 40 can be further improved. In addition, it becomes easier to temporarily fix the hub 40 and the holder body 12 with screws when performing the welding work, thus improving the workability of the joining work between the hub 40 and the holder body 12. Note that in the configuration of this example, the molten portion and the screw connection portion can also be formed at different locations. For example, the molten portion can be formed at the contact point between the male screw portion 43 and the inner circumferential surface of the inner cylinder 19, at a position away from the screw connection portion 52 indicated by point Q in Figure 2.

[0051] Furthermore, the holder body 12 of the blood collection tube holder 10 in this embodiment has an outer cylinder 17 and an inner cylinder 19 connected to the outer cylinder 17 via ribs 23 and 24 provided on a part of the circumferential direction inside the outer cylinder 17. A hub 40 is positioned inside the inner cylinder 19, and the inner cylinder 19 and the hub 40 have a molten portion 50 where the resins of each are melted together on the inner circumference of the inner cylinder 19 at a position facing the first rib 23 via the inner cylinder 19. As a result, the presence of the outer cylinder 17 makes it difficult for external pressure to be applied to the inner cylinder 19 and the hub 40, and the phenomenon of the hub 40 detaching during transport can be suppressed. Moreover, ribs 23 and 24 are provided between the outer cylinder 17 and the inner cylinder 19, and the hub 40 and the inner cylinder 19 are welded and fixed at a predetermined position corresponding to the first rib 23, so that the holder body 12 and the hub 40 can be stably fixed. This also makes it less likely that the hub 40 will tilt slightly when the holder body 12 and the hub 40 are joined, resulting in the cutting edge not being positioned correctly.

[0052] Furthermore, the molten portion 50 welds the hub 40 to the holder body 12 at the axial center of the screw joint portion 52, or on the side of the holder body 12 where the blood collection tube is attached, from the axial center. As a result, as shown in Figure 3, a container 100 for protecting the blood collection needle can be attached to the inside of the tip, which is the end of the holder body 12 opposite to the side where the blood collection tube is attached. When welding the hub 40 to the holder body 12 with the container 100 attached, the contact position of the tip of the ultrasonic horn with the holder body 12 during ultrasonic welding is far away from the container attachment portion on the holder body 12. Therefore, the transmission of ultrasonic vibrations from the ultrasonic horn to the container attachment portion can be suppressed, making it easier to prevent the container 100 from being heat-welded to the holder body 12 and becoming impossible to remove.

[0053] Furthermore, in the manufacturing method of the blood collection tube holder of the embodiment, the holder body 12 has an outer cylinder 17 and an inner cylinder 19 connected to the outer cylinder 17 via ribs 23 and 24 provided on a part of the circumferential direction inside the outer cylinder 17, a hub 40 is placed inside the inner cylinder 19, and an ultrasonic horn is applied to the outer circumferential surface of the outer cylinder 17 at the part where the first rib 23 is located on the inside, and the hub 40 and the holder body 12 are welded together by ultrasonic welding. In this way, the presence of the outer cylinder 17 makes it difficult for external pressure to be applied to the inner cylinder 19 and the hub 40, and the phenomenon of the hub 40 detaching during transport can be suppressed. Moreover, since the holder body 12 and the hub 40 can be stably fixed, problems such as the hub 40 tilting slightly and the cutting edge not being positioned in the correct position are less likely to occur.

[0054] Furthermore, in the manufacturing method of the blood collection tube holder of this embodiment, the hub 40 has a flange 41a that protrudes radially outward in a part of the axial direction, and the side surface of the flange 41a is brought into contact with the holder body 12 before fixing the hub 40 to the holder body 12 by welding. This positions the hub 40 axially with respect to the holder body 12. Therefore, since the hub 40 can be easily positioned with respect to the holder body 12 before performing the welding work, the welding work between the holder body 12 and the hub 40 is made easier.

[0055] Furthermore, if the inner cylinder 19 and the hub 40 have a molten portion at the inner circumference of the rib 23, the male threaded portion of the hub 40 and the female threaded portion of the inner cylinder 19 may be omitted, and the holder body 12 and the hub 40 may be joined only by the molten portion.

[0056] Furthermore, although the above describes a case in which a molten portion 50 is formed on a point-like portion of both the circumferential and axial sides of the outer surface of the hub 40 using an ultrasonic horn, the present invention is not limited thereto. For example, the tip of the ultrasonic horn may be shaped such as an arc with a central angle of less than 90 degrees, elongated along the circumferential direction of the outer surface of the outer cylinder 17, and the holder body 12 and the hub 40 may be welded together with a molten portion that is elongated in the circumferential direction. Alternatively, the tip of the ultrasonic horn may be shaped such as an arc with a central angle of less than 90 degrees, elongated along the axial direction of the outer surface of the outer cylinder 17, and the holder body 12 and the hub 40 may be welded together with a molten portion that is elongated in the axial direction or intermittently formed in the axial direction. [Explanation of symbols]

[0057] 10 Blood collection tube holder, 12 Holder body, 13 Body cylinder, 14 Longitudinal rib, 15 Flange, 16 Holding part, 17 Outer cylinder, 19 Inner cylinder, 20 Female threaded part, 23 First rib, 24 Second rib, 25 Hole, 40 Hub, 41 Tip, 41a Flange, 42 Intermediate shaft, 43 Male threaded part, 44 Base shaft, 50 Melted part, 52 Screw connection part, 80 Blood collection needle, 100 Container, 102 Blood collection tube.

Claims

1. A blood collection tube holder comprising a cylindrical resin holder body and a resin hub to which a blood collection needle is fixed and which is fixed to the inside of the holder body, wherein a blood collection tube is detachably attached to the holder body, The hub has a male threaded portion on its outer surface, The holder body is provided at the end opposite to the side where the blood collection tube is attached, and has a cylindrical holding portion with a smaller diameter than the side where the blood collection tube is attached, an inner cylinder of the holding portion with a smaller inner diameter than the tip of the holding portion, and a female screw portion formed on the inner circumferential surface of the inner cylinder that can be screwed into the male screw portion. The hub and the holder body have a molten portion where the resins of each are fused together, with the female threaded portion screwed into the male threaded portion. The molten portion is a point weld where the inner surface of the inner cylinder and the portion of the outer surface of the hub facing the inner surface of the inner cylinder are welded together in a portion of the outer surface of the hub in at least one of the circumferential and axial directions. Blood collection tube holder.

2. In the blood collection tube holder according to claim 1, The aforementioned point welding welds the hub and the holder body at the threaded connection between the male thread and the female thread. Blood collection tube holder.

3. A blood collection tube holder comprising a cylindrical resin holder body and a resin hub to which a blood collection needle is fixed and which is fixed to the inside of the holder body, wherein a blood collection tube is detachably attached to the holder body, The hub has a male threaded portion on its outer surface, The holder body has a female thread portion at the end opposite to the side where the blood collection tube is attached, which can be screwed into the male thread portion. The hub and the holder body have a molten portion where the resins of each are fused together, with the female threaded portion screwed into the male threaded portion. The molten portion is a point weld that welds the hub and the holder body together in a portion of the outer surface of the hub in at least one of the circumferential and axial directions. The holder body comprises an outer cylinder and an inner cylinder connected to the inner side of the outer cylinder via ribs provided on a part of the circumferential direction. The hub is positioned inside the inner cylinder, and the inner cylinder and the hub have a molten portion where their resins are fused together at the inner circumference of the inner cylinder at a position facing the rib via the inner cylinder. Blood collection tube holder.

4. In the blood collection tube holder according to any one of claims 1 to 3, The molten portion is located at the axial center of the screw connection between the female screw portion and the male screw portion, or at the axial center of the holder body on the side of the holder body where the blood collection tube is attached, thereby welding the hub and the holder body together. Blood collection tube holder.

Images