Syringe for automatic injection device
The syringe's innovative flange design with guide grooves facilitates easy attachment and secure pressure-receiving area alignment, addressing the challenges of complex rotation and damage in existing syringe designs.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ORT MEDICAL CO LTD
- Filing Date
- 2024-10-23
- Publication Date
- 2026-05-11
Smart Images
Figure 2026075855000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a syringe for an automatic injection device that is used by being attached to the automatic injection device.
Background Art
[0002] In the medical field, there are provided automatic injection devices for injecting liquids such as highly viscous chemical solutions like contrast agents for X-ray CT imaging and contrast agents for MRI (magnetic resonance imaging devices) into the body of a subject. A syringe is attached to the automatic injection device directly or via a syringe holder.
[0003] The automatic injection device performs an operation of extruding the liquid filled inside the syringe attached to the automatic injection device from the tip of the syringe barrel by pressing the plunger of the syringe. During the operation of pressing the plunger of the syringe, the flange of the syringe is pressed against the side wall surface of the flange receiving portion of the automatic injection device or the side wall surface of the flange receiving portion of the syringe holder attached to the automatic injection device. At this time, if the area of the flange of the syringe pressed against the side wall surface of the flange receiving portion (hereinafter referred to as the pressure receiving area of the flange) is small, there is a risk of damage to the flange.
[0004] As a method for ensuring the pressure receiving area of the flange of the syringe, for example, a method has been devised in which a flange having a flange cut portion is inserted into a syringe holder groove with the flange cut portion perpendicular, and the syringe is rotated 90° about the central axis direction of the syringe (see Patent Document 1).
[0005] In addition, another method has been devised in which when the flange inserted into the syringe holder groove of the flange is rotated 90° about the central axis direction of the syringe, a notch provided in the arc portion of the flange is engaged with a claw provided on the syringe holder (see Patent Document 2).
Prior Art Documents
Patent Documents
[0006] [Patent Document 1] Japanese Patent Publication No. 2020-036959 [Patent Document 2] Patent No. 5878115 [Overview of the project] [Problems that the invention aims to solve]
[0007] For example, in the method described in Patent Document 1, it is difficult to determine whether the syringe is rotated to the appropriate angle when it is attached to the automatic injection device, and it is also difficult to adjust it. As a result, it may not be possible to adequately secure the pressure-receiving area of the flange.
[0008] Furthermore, in the method described in Patent Document 2, the claws provided on the syringe holder engage with a notch provided on the arc portion of the flange, and this engagement allows for confirmation that the pressure-receiving area of the flange is appropriate. However, the method described in Patent Document 2 requires rotating the syringe until the claws provided on the syringe holder engage with the notch provided on the arc portion of the flange, which presents a problem in that it is time-consuming to prepare the syringe for mounting on the automatic injection device.
[0009] The present invention aims to provide a syringe for an automatic injection device that allows for securing the pressure-receiving area of the flange with simple operation when attached to the automatic injection device. [Means for solving the problem]
[0010] A syringe for an automatic injection device according to one aspect of the present invention is a syringe for an automatic injection device in which a flange is inserted into a receiving portion provided on either the automatic injection device or a holder attached to the automatic injection device, the flange being characterized by having a flange surface located on the tip side of the syringe outer cylinder in the direction of the central axis of the syringe outer cylinder and pressed against the inner wall surface of the receiving portion when the automatic injection device is in operation, and a pair of guide grooves provided at both ends of the flange surface in directions perpendicular to the central axis and the direction in which the flange is inserted into the receiving portion, into which each of a pair of protruding pins protruding from the inner wall surface of the receiving portion is inserted when the flange is inserted into the receiving portion.
[0011] Furthermore, it is preferable that the spacing between the pair of guide grooves is narrower towards the tip side in the direction of insertion into the flange receiving portion. [Effects of the Invention]
[0012] According to this disclosure, the device can be attached to a syringe holder with simple operation while ensuring the pressure-receiving area of the flange is secured. [Brief explanation of the drawing]
[0013] [Figure 1] This is a perspective view showing an example of how to use the syringe for the automatic injection device shown in this embodiment. [Figure 2] This is a schematic perspective view showing one configuration of a syringe for an automatic injection device as shown in this embodiment. [Figure 3] Figure 2 is a six-view drawing showing the configuration of the flange of the syringe. [Figure 4] (a) is a diagram showing the top surface of the syringe holder, and (b) is a cross-sectional view AA shown in (a). [Figure 5] (a) is a cross-sectional view of the cylinder holder just before the flange is inserted, and (b) is a cross-sectional view of the cylinder holder with the flange attached. [Figure 6] This is a cross-sectional view of a cylinder holder when the flange is inserted while rotated at a predetermined angle in the direction of the central axis of the cylinder outer cylinder. [Figure 7] It is a diagram showing an overview of the external pressure test of the flange. [Figure 8] (a) It is a diagram showing the shape of the flange as Comparative Example 1, and (b) the shape of the flange as Comparative Example 2.
Mode for Carrying Out the Invention
[0014] Hereinafter, referring to the drawings, an example of a syringe for an automatic injection device, which is an embodiment of the present invention, will be described. Hereinafter, the syringe for an automatic injection device will be described by referring to it as a syringe. Also, a liquid such as a contrast agent filled in the syringe outer cylinder 11 will be referred to as a liquid.
[0015] As shown in FIG. 1, the syringe 10 is attached to the syringe mounting portion 121 of the automatic injection device 120 via the syringe mounting portion 101 of the automatic injection device 100 or the syringe holder 110. Note that the syringe holder 110 is attached to the holder receiving portion 122 provided in the syringe mounting portion 121 of the automatic injection device 120.
[0016] As shown in FIG. 2, the syringe 10 has a syringe outer cylinder 11 and a plunger 12. The syringe outer cylinder 11 is a cylindrical member formed of, for example, a synthetic resin material. The syringe outer cylinder 11 has a cylinder tip 15 at one end in the direction of the central axis C1 of the syringe outer cylinder 11 and a flange 20 at the other end in the direction of the central axis C1. The cylinder tip 15 of the syringe outer cylinder 11 has a connector shape with a screw portion formed on the inner peripheral surface, and can be connected to a connector portion provided at one end of a liquid feeding tube (not shown).
[0017] The plunger 12 is inserted into the syringe outer cylinder 11 from the other end of the syringe outer cylinder 11. The plunger 12 can move along the central axis C1 direction of the syringe outer cylinder 11 and push into or pull out from the syringe outer cylinder 11. For example, when the plunger 12 is pushed into the syringe outer cylinder 11, the liquid filled in the syringe outer cylinder 11 is sent out from the cylinder tip 15 of the syringe outer cylinder 11 to a liquid feeding tube (not shown).
[0018] Next, the shape of the flange 20 will be described with reference to FIG. 3. FIG. 3(a) is a front view of the flange, and FIG. 3(b) is a rear view of the flange. Further, FIG. 3(c) is a plan view of the flange, and FIG. 3(d) is a bottom view of the flange. FIG. 3(e) is a left side view of the flange, and FIG. 3(f) is a right side view of the flange. In FIGS. 3(a) and 3(c), the syringe outer cylinder 11 is shown by a two-dot chain line.
[0019] The flange 20 is a substantially rectangular member having the longitudinal direction in the left-right direction and the short direction in the up-down direction in FIGS. 3(a) and 3(b). When the length in the longitudinal direction of the flange 20 is L1 and the length in the short direction is L2, for example, the length L1 is L1 = 41 mm, and the length L2 is, for example, L2 = 36 mm. On the other hand, when the outer diameter of the syringe outer cylinder 11 is D1, as an example, the outer diameter D1 is D1 = 33 mm.
[0020] A pair of guide grooves 21 and 22 are provided at both ends in the longitudinal direction of the flange 20. The pair of guide grooves 21 and 22 are provided on the flange surface 20a of the flange 20. The pair of guide grooves 21 and 22 are parallel grooves extending in the short direction from the lower end to the upper end of the flange 20. Of the pair of guide grooves 21 and 22, the guide groove 21 is a groove cut out across from the flange surface 20a of the flange 20 to the side surface 20c (see FIG. 3(e)). Similarly, the guide groove 22 is a groove cut out across from the flange surface 20a of the flange 20 to the side surface 20d (see FIG. 3(e)). When the widths of the pair of guide grooves 21 and 22 on the flange surface 20a are W1 and W2, as an example, the widths W1 and W2 are W1 = W2 = 2 mm. Also, the depth H1 of one of the guide grooves 21 and 22 is, as an example, H1 = 1.5 mm. When the thickness of the flange 20 is H0, as an example, the thickness H0 is H0 = 3.2 mm. The lengths of the pair of guide grooves 21 and 22 are the same. That is, when the flange 20 is attached to the flange receiving portion 111 provided in the syringe holder 110 or the flange receiving portion 102 provided in the automatic injector 100, the longitudinal direction of the flange 20 is in a state parallel to the horizontal direction.
[0021] Of the pair of guide grooves 21 and 22, the side surface 25 of guide groove 21 is composed of a side surface 25a extending in the short direction of flange 20 and a side surface 25b that slopes toward the center in the longitudinal direction of flange 20 from the side surface 25a toward the lower end of flange 20. Similarly, the side surface 26 of guide groove 22 is composed of a side surface 26a extending in the short direction of flange 20 and a side surface 26b that slopes toward the center in the longitudinal direction of flange 20 from the side surface 26a toward the lower end of flange 20. In other words, the spacing between the pair of guide grooves 21 and 22 is narrower towards the tip side in the direction of insertion of flange 20 into flange receiving portion 111 provided on syringe holder 110 or flange receiving portion 102 provided on automatic injection device 100.
[0022] For example, when attaching syringe 10 to syringe mounting section 101 on automatic injection device 100, the protruding pins 103 and 104 provided on flange receiving section 102 of syringe mounting section 101 are inserted into the pair of guide grooves 21 and 22, respectively (see Figure 1). Also, for example, when attaching syringe 10 to automatic injection device 120 via syringe holder 110, the protruding pins 112 and 113 provided on flange receiving section 111 of syringe holder 110 are inserted into the pair of guide grooves 21 and 22, respectively (see Figure 1).
[0023] The side surfaces 25 and 26 of the pair of guide grooves 21 and 22 described above have side surfaces 25b and 26b. As a result, even when the flange 20 is inserted into the syringe holder 110 with its longitudinal direction inclined with respect to the horizontal, the flange 20 rotates until its longitudinal direction is parallel to the horizontal, allowing it to be mounted in the syringe holder 110. The same applies when mounting the syringe 10 to the syringe mounting section 101 of the automatic injection device 100.
[0024] When the longitudinal direction of the flange 20 is parallel to the horizontal direction, both ends of the flange 20 in the longitudinal direction are located at both ends of the flange receiving portion 111 of the syringe holder 110 (see Figure 5(b). That is, when the plunger 12 of the syringe 10 is pressed, the area (pressure receiving area) on which the flange surface 20a of the flange 20 is pressed against the inner wall surface 111a of the flange receiving portion 111 of the syringe holder 110 is maximized.
[0025] As described above, the syringe 10 is either directly attached to the automatic injection device 100 or attached to the automatic injection device 120 using the syringe holder 110.
[0026] As shown in Figure 1, the automatic injection device 100 has a flange receiving portion 102 in addition to the syringe mounting portion 101. Of the inner surfaces constituting the flange receiving portion 102, protruding pins 103 and 104 protrude toward the inner wall surface 102b from the inner wall surface 102a facing the flange surface 20a. The distance between the protruding pins 103 and 104 is the same as, or slightly wider than, the distance from the width center of the guide groove 21 to the width center of the guide groove 22. The thickness of the flange receiving portion 102 and the amount of protrusion of the protruding pins 103 and 104 are such that when the flange 20 of the syringe 10 is inserted into the flange receiving portion 102, the protruding pins 103 and 104 can be inserted into the guide grooves 21 and 22 of the flange 20, respectively. As a result, when the flange 20 is inserted into the flange receiving portion 102, its direction of movement is restricted by the protruding pins 103 and 104.
[0027] As shown in Figures 4(a) and 4(b), the syringe holder 110 is a component having a flange receiving portion 111 and a syringe receiving portion 115 into which the syringe outer cylinder 11 is inserted. Hereinafter, the left-right direction in Figure 4 will be referred to as the width direction W3. Of the inner surfaces constituting the flange receiving portion 111, protruding pins 112 and 113 protrude toward the inner wall surface 111b from the inner wall surface 111a facing the flange surface 20a. The spacing between the protruding pins 112 and 113 in the width direction W3 is the same as, or slightly wider than, the spacing from the width center of the guide groove 21 to the width center of the guide groove 22. The thickness of the flange receiving portion 111 and the amount of protrusion of the protruding pins 112 and 113 are such that when the flange 20 of the syringe 10 is inserted into the flange receiving portion 111, the protruding pins 112 and 113 can be inserted into the guide grooves 21 and 22 of the flange 20, respectively. In this case as well, when the flange 20 is inserted into the flange receiving portion 111, its direction of movement is restricted by the protruding pins 112 and 113.
[0028] Next, the procedure for attaching syringe 10 to syringe holder 110 will be described. Note that the procedure for attaching syringe 10 to automatic injection device 100 is the same as the procedure for attaching syringe 10 to syringe holder 110, so the explanation for attaching syringe 10 to automatic injection device 100 will be omitted.
[0029] As shown in Figures 5(a) and 5(b), the syringe 10 is mounted on the syringe holder 110. At this time, the flange 20 of the syringe 10 is received by the flange receiving portion 111 of the syringe holder 110. When the flange 20 of the syringe 10 is received by the flange receiving portion 111 of the syringe holder 110, the protruding pin 112 provided on the inner wall surface 111a is received by the guide groove 21 of the flange 20. Simultaneously, the protruding pin 113 provided on the inner wall surface 111a is received by the guide groove 22 of the flange 20.
[0030] As described above, the distance between the protruding pins 112 and 113 is the same as, or slightly wider than, the distance from the width center of the guide groove 21 to the width center of the guide groove 22. As a result, when the flange 20 is inserted into the flange receiving portion 111, its direction of movement is restricted by the protruding pins 112 and 113.
[0031] Furthermore, the side surface 25b of the guide groove 21 is inclined with respect to the side surface 25a toward the midpoint in the longitudinal direction of the flange 20. Similarly, the side surface 26b of the guide groove 22 is inclined with respect to the side surface 26a toward the midpoint in the longitudinal direction of the flange 20. Therefore, as shown in Figure 6, even if the flange 20 rotates by a predetermined amount around the central axis C1 direction of the syringe outer barrel 11, the flange 20 of the syringe 10 rotates around the central axis C1 direction of the syringe outer barrel 11 during the process of the flange 20 of the syringe 10 being received by the flange receiving portion 111 of the syringe holder 110. As a result, the flange 20 that is received by the flange receiving portion 111 when the protruding pins 112 and 113 are inserted into the guide grooves 21 and 22 is held so that the longitudinal direction of the flange 20 is horizontal. In this way, the syringe 10 can be attached to the syringe holder 110 with a simple operation of inserting the flange 20 of the syringe 10 into the flange receiving portion 111 of the syringe holder 110. The same effect can be obtained when it is attached directly to the automatic injection device 100.
[0032] In this state, both ends of the flange 20 in the longitudinal direction are positioned at both ends of the flange receiving portion 111 of the syringe holder 110 in the width direction W3. In this state, the pressure-receiving area of the flange 20 is secured. In addition, a pair of guide grooves 21 and 22 of the flange 20 are provided at both ends of the flange 20 in the longitudinal direction. Therefore, when the plunger 12 of the syringe 10 is pressed, even if both ends of the flange 20 in the longitudinal direction are pressed against the inner wall surface 111a of the flange receiving portion 111, the pressing force applied to the flange 20 can be received, and damage to the flange 20 can be prevented. The same applies when the syringe 10 is attached to the syringe mounting portion 101 of the automatic injection device 100.
[0033] The following shows the results of the pressure resistance measurement of the flange. As shown in Figure 7, the syringe 140 was mounted on a jig 145 and placed on a pressure resistance measuring device (not shown) with the syringe 140 mounted on a jig 145 so that the tip 142 of the syringe outer cylinder 141 of the syringe 140 was facing downwards. The pressure resistance performance was measured when the plunger 143 of the syringe 140 was pressed with the pressure resistance measuring device. With the syringe 140 mounted on the jig 145, the flange surface 144a of the flange 144 is in contact with the upper surface 145a of the jig 145.
[0034] The flange shape is as follows. The flange described in this embodiment (see Figure 3) is designated as Example 1. The conventionally used flange 150 (see Figure 8(a)) is designated as Comparative Example 1. The flange 160 (see Figure 8(b)) having a notch in the arc portion is designated as Comparative Example 2. Comparative Example 2 is the flange used in the aforementioned Patent Document 2.
[0035] [Table 1]
[0036] As shown in Table 1, the pressure resistance performance of the flange in Example 1 is 47.18 × 10⁻⁶. 5 N / m 2 The above was the case. In Comparative Example 1 and Comparative Example 2, the pressure resistance performance was the same as in Example 1, 47.18 × 10⁻⁶. 5 N / m 2 In conclusion, it was found that the flange of Example 1 has the same pressure resistance performance as the flanges of Comparative Example 1 and Comparative Example 2.
[0037] <Summary of effects> An automatic injection device syringe 10 is provided with a flange 20 on the syringe outer cylinder 11 that is inserted into flange receiving portions 102, 111 provided on either the automatic injection device 100 or the syringe holder 110 which is attached to the automatic injection device 120, wherein the flange 20 is located on the tip 15 side of the syringe outer cylinder 11 in the direction of the central axis C1 of the syringe outer cylinder 11 and is pressed against the inner wall surfaces 102a, 111a of the flange receiving portions 102, 111 when the automatic injection device 100, 120 is in operation. The flange is characterized by having a lunge surface 20a and a pair of guide grooves 21, 22 provided at both ends of the flange surface 20a in directions perpendicular to the central axis C1 direction and the direction in which the flange 20 is inserted into the flange receiving portions 102, 111, into which each of a pair of protruding pins 103, 104 or a pair of protruding pins 112, 113 that protrudes from the inner wall surfaces 102a, 111a of the flange receiving portions 102, 111 is inserted when the flange 20 is inserted into the flange receiving portions 102, 111.
[0038] According to this, mounting to the automatic injection devices 100 and 120 can be done with a simple operation of inserting a pair of protruding pins 103 and 104 or a pair of protruding pins 112 and 113 provided on the flange receiving portions 102 and 111 into a pair of guide grooves 21 and 22 provided on the flange 20. Furthermore, by performing the operation of inserting a pair of protruding pins 103 and 104 or a pair of protruding pins 112 and 113 provided on the flange receiving portions 102 and 111 into a pair of guide grooves 21 and 22 provided on the flange 20, the pressure receiving area of the flange 20 mounted on the flange receiving portions 102 and 111 can be appropriately secured.
[0039] Furthermore, the spacing between the pair of guide grooves 21 and 22 is such that it becomes narrower towards the tip side in the insertion direction of the flange 20 into the flange receiving portions 102 and 111.
[0040] According to this, even if the flange 20 is rotated around the central axis C1 and received by the flange receiving parts 102 and 111, the flange 20 can be received by the flange receiving parts 102 and 111 with its longitudinal direction parallel to the horizontal direction. This ensures a sufficient pressure-receiving area, thereby preventing damage to the flange 20. [Explanation of Symbols]
[0041] 10 Syringes for automatic injection devices 11 Syringe barrel 20 flanges 20a Flange surface 21,22 Pair of guide grooves 100,120 Automatic injection device 102,111 Flange receiving section 102a, 111a Inner wall surface 103, 104 Pair of protruding pins 110 Syringe holder 112,113 Pair of protruding pins
Claims
1. A syringe for an automatic injection device, wherein the syringe outer barrel is equipped with a flange that is inserted into a receiving portion provided on either the automatic injection device or a holder attached to the automatic injection device, The flange mentioned above is A flange surface located on the tip side of the syringe outer barrel in the direction of the central axis of the syringe outer barrel, and which is pressed against the inner wall surface of the receiving portion when the automatic injection device is in operation, A pair of guide grooves are provided at both ends of the flange surface in directions perpendicular to the central axis direction and the direction in which the flange is inserted into the receiving portion, and into which each of the pair of protruding pins that protrude from the inner wall surface of the receiving portion is inserted when the flange is inserted into the receiving portion, A syringe for an automatic injection device, characterized by having the following features.
2. A syringe for an automatic injection device, characterized in that the spacing between the pair of guide grooves narrows towards the tip side in the direction of insertion of the flange into the receiving portion.