Syringe set

Abstract

To provide a syringe set capable of attaching a protector to a needle base in a fall prevention state and improving convenience of the protector in use.SOLUTION: A syringe set 1 includes a needle base 3 and a protection cover 10. First and second projections 11f and 11g of an attachment part 11 are fitted to an annular groove 31e of the needle base 3, so that the protection cover 10 is attached to the needle base 3. The first projection 11f slidably contacts one wall of the annular groove 31e and the second projection 11g slidably contacts the other wall of the annular groove 31e. A pair of first projections 11f and 11f and a pair of second projections 11g and 11g are arranged so as to have double rotational symmetry.SELECTED DRAWING: Figure 9

Description

Technical Field

[0005]

[0001] The present invention relates to a syringe set provided with a protector for protecting a syringe needle.

Background Art

[0002] Conventionally, a syringe set described in Patent Document 1 is known. This syringe set includes a protector for protecting a syringe needle and a needle base. The needle base has four ribs on its outer peripheral surface, and these ribs extend along the axial direction of the needle base. [[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​The present invention was made to solve the above problems and aims to provide a syringe set that allows protective equipment to be attached to the needle base in a way that prevents it from coming off, thereby improving the convenience of using the protective equipment. [Means for solving the problem]

[0007] To achieve the above objective, the invention according to claim 1 is a syringe set comprising a needle base to which an injection needle and a syringe are attached, and a protective device having a mounting portion attached to the needle base and protecting the injection needle in a covered state, wherein the outer circumferential surface of the needle base has one of a recess and a plurality of protrusions that can be fitted together, the mounting portion has an inner hole formed on its inner circumferential surface with the other of the recess and the plurality of protrusions fitted together, the recess is attached to the needle base in a state with the recess and the plurality of protrusions fitted together, the recess is formed in an annular shape along the circumferential direction of the outer circumferential surface of the needle base or the inner circumferential surface of the mounting portion, the plurality of protrusions have a pair of first protrusions whose tip portions slide against one wall in the axial direction of the recess when fitted into the recess, and a pair of second protrusions, each positioned between the pair of first protrusions, whose tip portions slide against the other wall in the axial direction of the recess when fitted into the recess, The pair of first protrusions and the pair of second protrusions are characterized in that they extend on the inner circumferential surface of the mounting portion to include positions opposite each other with respect to the center of the inner hole, or extend on the outer circumferential surface of the needle base to include positions opposite each other with respect to the center of the needle base.

[0008] In this syringe set, the mounting part is attached to the needle base by fitting together one of the recesses and multiple protrusions formed on the outer circumferential surface of the needle base with the other of the recesses and multiple protrusions formed on the inner circumferential surface of the mounting part's inner bore. The recess is formed in an annular shape along the circumferential direction of the outer circumferential surface of the needle base or the inner circumferential surface of the mounting part, and the pair of first protrusions and the pair of second protrusions of the multiple protrusions extend to include positions on the inner circumferential surface of the mounting part that are opposite each other on either side of the center of the mounting part, or to include positions on the outer circumferential surface of the needle base that are opposite each other on either side of the center of the needle base. This makes it possible to make the mounting part and the needle base rotatable relative to each other around the central axis of the needle base, and ensures smooth rotation during such rotation. As a result, when using the protective device, by rotating the protective device relative to the needle base, the position of the protective device can be adjusted to a position that makes it easy to cover the injection needle with the protective device, thereby improving the convenience of using the protective device.

[0009] Furthermore, after the injection needle and syringe are attached to the needle base, when the drug solution is injected into the syringe, the protective device can be rotated around the central axis of the needle base to prevent it from overlapping the markings on the syringe. In addition, the pair of first protrusions in the multiple protrusions slide against one wall of the recess in the axial direction when fitted into the recess, and the pair of second protrusions are each positioned between the pair of first protrusions, and when fitted into the recess, their tips slide against the other wall of the recess in the axial direction. This allows the mounting part to be firmly attached to the needle base in a way that prevents it from coming loose.

[0010] The invention according to claim 2 is characterized in that, in the syringe set described in claim 1, at least one of the pair of first protrusions and the pair of second protrusions has twofold rotational symmetry about the inner hole of the mounting portion or the central axis of the needle base.

[0011] With this syringe set, at least one of the pair of first protrusions and the pair of second protrusions has twofold rotational symmetry about the inner bore of the mounting part or the central axis of the needle base, thereby improving the smoothness of the relative rotation of the mounting part and the needle base about the central axis of the needle base.

[0012] The invention according to claim 3 is characterized in that, in the syringe set described in claim 2, each of the pair of first protrusions and each of the pair of second protrusions are arranged at equal intervals from each other around the inner hole of the mounting portion or the central axis of the needle base.

[0013] In this syringe set, each of the pair of first protrusions and each of the pair of second protrusions are arranged at equal intervals from each other around the inner hole of the mounting part or the central axis of the needle base, thereby further improving the smoothness of the relative rotation of the mounting part and the needle base around the central axis of the needle base.

[0014] The invention according to claim 4 is a syringe set according to any one of claims 1 to 3, wherein the outer circumferential surface of the needle base and the inner circumferential surface of the mounting portion have other recesses and a plurality of other protrusions that can be fitted together, arranged axially apart from the recesses and the plurality of protrusions, and the other recesses are formed in an annular shape along the circumferential direction.

[0015] In this syringe set, the outer circumferential surface of the needle base and the inner circumferential surface of the mounting part have other recesses and multiple other protrusions that can be fitted together, spaced apart axially from the recesses and multiple protrusions, and these other recesses are formed in an annular shape along the circumferential direction. As a result, when the mounting part and the needle base rotate relative to each other around the central axis of the needle base, it is possible to avoid relative rattling between them and to ensure a stable rotation state.

[0016] The invention according to claim 5 is a syringe set according to claim 1, wherein the protective device further comprises a protective cover portion configured to be movable between an uncovered position that does not cover the injection needle, a covered position that covers a predetermined portion of the injection needle including at least the tip of the needle, and a locked position located on the opposite side of the uncovered position from the covered position and locked to a mounting portion, and a hinge portion provided between the protective cover portion and the mounting portion and configured to rotate the protective cover portion between the uncovered position and the covered position, wherein the protective cover portion has a temporary fixing recess on the inner surface on the hinge portion side, the temporary fixing recess has a pair of side walls extending along the rotation direction of the protective cover portion, and the mounting portion further comprises a temporary fixing protrusion that, when the protective cover portion rotates from the uncovered position to the covered position, is pressed into the temporary fixing recess in a sliding contact with the pair of side walls of the recess of the protective cover portion from a position prior to the covered position.

[0017] With this syringe set, when the user rotates the protective cover from the uncovered position to the covered position, the temporary fixing protrusion of the mounting part is pressed into the temporary fixing recess of the protective cover from a position before the covered position, while sliding against the pair of side walls of the temporary fixing recess. As a result, the user can sense that the protective cover has moved to a position close to the covered position due to the resistance when the temporary fixing protrusion is pressed into the pair of side walls of the temporary fixing recess, and can avoid rotating the protective cover to the covered position with excessive force.

[0018] Furthermore, because the temporary fixing protrusion is pressed into the temporary fixing recess, the protective cover will remain in the covered position unless the user intentionally rotates the protective cover from the covered position to the uncovered position, or unless a large external force is applied to the protective cover. As a result, the protective function of the protective cover on the injection needle can be enhanced.

[0019] The invention according to claim 6 is a syringe set according to claim 1, wherein the protective device further comprises a protective cover portion configured to be movable between an uncovered position that does not cover the injection needle, a covered position that covers a predetermined portion of the injection needle including at least the tip of the needle, and a locked position located on the opposite side of the uncovered position from the covered position and locked to a mounting portion, and a hinge portion provided between the protective cover portion and the mounting portion, configured to rotate the protective cover portion between the uncovered position and the covered position, and to press the protective cover portion on the opposite side of the uncovered position when the protective cover portion is in the covered position, and the mounting portion further comprises a contact portion to which the first contact portion of the protective cover portion contacts at a position in front of the covered position when the protective cover portion rotates from the uncovered position to the covered position.

[0020] With this syringe set, when the user rotates the protective cover from the uncovered position to the covered position, the first contact portion of the protective cover contacts the contact portion of the mounting part at a position in front of the covered position. As a result, the user can sense that the protective cover has moved to a position in front of the covered position due to the pressure when the first contact portion contacts the contact portion, and can avoid rotating the protective cover to the covered position with excessive force.

[0021] Furthermore, the protective cover is configured to be pressed against the opposite side of the uncovered position by the hinge when in the covered position. As a result, the protective cover will remain in the covered position unless the user intentionally rotates it from the covered position to the uncovered position, or a large external force is applied to it. Consequently, the protective function of the injection needle provided by the protective cover can be enhanced.

[0022] The invention according to claim 7 is characterized in that, in the syringe set described in claim 6, the contact portion of the mounting portion is configured to contact a second contact portion, which is different from the first contact portion of the protective cover portion, so that when the protective cover portion rotates from the cover position to the locked position, the protective cover portion is held in the locked position.

[0023] According to this syringe set, when the protective cover part rotates from the cover position to the lock position, the abutted part of the mounting part abuts against a second abutting part different from the first abutting part of the protective cover part so that the protective cover part is held in the lock position. Thereby, it is possible to avoid the protective cover part from rotating from the lock position toward the side opposite to the cover position, and it is possible to avoid damage to the protector.

[0024] The invention according to claim 8 is the syringe set according to claim 1, wherein the protector further includes a protective cover part configured to be movable between a non-cover position that does not cover the injection needle, a cover position that covers a predetermined part including at least the tip of the injection needle, and a lock position that is located on the side opposite to the non-cover position with respect to the cover position and is locked to the mounting part, and a hinge part provided between the protective cover part and the mounting part and configured to rotate the protective cover part between the non-cover position and the cover position. The mounting part has a pair of first temporary fixing convex parts provided to face each other. When the protective cover part rotates from the non-cover position to the cover position, the protective cover part has a pair of second temporary fixing convex parts provided to abut against the pair of first temporary fixing convex parts of the mounting part from a position in front of the cover position and then climb over the pair of first temporary fixing convex parts. The protective cover part is held in the cover position with respect to the mounting part when it is in the cover position.

[0025] According to this syringe set, when the user rotates the protective cover part from the non-cover position to the cover position, the pair of second temporary fixing convex parts of the protective cover part abut against the pair of first temporary fixing convex parts of the mounting part at a position in front of the cover position and then climb over the pair of first temporary fixing convex parts. Thereby, the user can detect that the protective cover part has moved to a position in front of the cover position close to the cover position by the pressure when the pair of second temporary fixing convex parts abut against the pair of first temporary fixing convex parts, and can avoid the protective cover part from being rotated to the cover position by excessive force.

[0026] Furthermore, due to the configuration in which the pair of second temporary fixing convex portions overcome the pair of first temporary fixing convex portions, by adjusting the contact state between the two, the force required for the user to rotate the protection cover portion from the non-cover position to the cover position can be set to an appropriate value.

[0027] Also, when the protection cover portion is in the cover position, it is held in the cover position with respect to the attachment portion. As a result, unless the protection cover portion is intentionally rotated by the user from the cover position to the non-cover position side or a large external force acts on the protection cover portion, the protection cover portion will be held in the cover position. Consequently, the protection function of the injection needle by the protection cover can be enhanced.

Brief Description of the Drawings

[0028] [Figure 1] It is a front view of a syringe set according to the first embodiment of the present invention. [Figure 2] It is a perspective view of the needle base. [Figure 3A] It is a front view of the needle base. [Figure 3B] It is a cross-sectional view of the needle base. [Figure 4] It is a front view of the protection cover. [Figure 5] It is a bottom view of the protection cover. [Figure 6] It is a perspective view of the protection cover. [Figure 7] It is a view showing a cross-section of the attachment portion along the line Y1 - Y1 in FIG. 6. [Figure 8] It is a perspective view showing the state where the protection cover is attached to the needle base. [Figure 9] It is a view showing a cross-section along the line Y2 - Y2 in FIG. 8. [Figure 10] It is a view showing a cross-section of the needle base and the attachment portion along the line Y3 - Y3 in FIG. 8. [Figure 11] It is a perspective view showing the configuration around the hinge portion. [Figure 12A] It is a front view when the protection cover portion is in the cover position. [Figure 12B]This is a cross-sectional view when the protective cover is in the cover position. [Figure 13] This is a front view showing the area around the mounting part when the protective cover is in the cover position. [Figure 14] This is a perspective view showing the area around the mounting part when the protective cover is in the cover position. [Figure 15A] This is a front view of the protective cover in the locked position. [Figure 15B] This is a cross-sectional view of the protective cover when it is in the locked position. [Figure 16] This is a left side view when the protective cover is in the locked position. [Figure 17] This is a partial cross-sectional perspective view showing the lower end of the protective cover in contact with the mounting part. [Figure 18] This is a front view showing the protective cap attached to the syringe set. [Figure 19] This is a cross-sectional view of the protective cap. [Figure 20] This is a partial cross-sectional view showing the protective cap attached to the syringe set. [Figure 21] This is a perspective view of the protective cover of the syringe set according to the second embodiment. [Figure 22] This is a left side view of the protective cover of the syringe set according to the second embodiment. [Figure 23] This is a perspective view of the needle base and protective cover of the syringe set according to the third embodiment. [Figure 24A] This diagram shows the protective cover in a position just before the cover itself. [Figure 24B] This figure shows the protective cover in contact with the protrusion on the mounting part. [Figure 25A] This diagram shows the protective cover in the cover position. [Figure 25B] This figure shows the protective cover being pressed from the cover position towards the locked position. [Figure 26] This is a perspective view of the protective cover of the syringe set according to the fourth embodiment. [Figure 27]This is a perspective view showing the protective cover in the position just before the cover is fully extended. [Figure 28] This is a left side view showing the protective cover in the position in front of the cover position. [Figure 29] This is a left side view showing the protective cover in its cover position. [Modes for carrying out the invention]

[0029] Hereinafter, a syringe set according to the first embodiment of the present invention will be described with reference to the drawings. As shown in Figure 1, the syringe set 1 of this embodiment comprises a needle 2, a needle base 3, a syringe 4, a plunger 5, and a protective cover 10. In this syringe set 1, the needle 2, syringe 4, and protective cover 10 are attached to the needle base 3.

[0030] As shown in Figures 2-3B, the needle base 3 comprises a base portion 30 and a tip portion 31, and these base portion 30 and tip portion 31 are integrally formed. For convenience, in the following description of the needle base 3, the left side of Figure 3A will be referred to as "left" and the right side as "right".

[0031] The base portion 30 has a cylindrical outer surface, and its outer diameter gradually decreases towards the left. An annular groove 30a is formed at the left end of the base portion 30. This annular groove 30a extends along the circumferential direction of the base portion 30, and its cross-section is formed in an arc shape when viewed from the front. When the protective cover 10 is attached to the needle base 3, the third projection 11h of the protective cover 10, which will be described later, fits into this annular groove 30a. In this embodiment, the annular groove 30a corresponds to another recess.

[0032] Furthermore, the tip portion 31 comprises a tip base portion 31a, a flange portion 31b, four first ribs 31c, and four second ribs 31d, and these elements 31a to 31d are integrally formed. The tip base portion 31a has a cylindrical outer surface, extends to the left from the base portion 30, and has a shape in which its outer diameter gradually decreases as it moves to the left.

[0033] The flange portion 31b is provided so as to protrude radially outward from the tip base 31a at a position closer to the base 30 of the tip base 31a, and its outer end surface is formed in a circular shape when viewed from the axial direction of the needle base 3. The outer end surface of the flange portion 31b is configured to have a smaller diameter than the outer circumferential surface of the left end of the base 30.

[0034] The four first ribs 31c project radially outward from the tip base 31a and extend to connect the base 30 and the flange portion 31b. The four first ribs 31c are arranged to have four-fold rotational symmetry about the central axis of the needle base 3, and the outer end face of each first rib 31c is configured to have a smaller diameter than the outer end face of the flange portion 31b.

[0035] With the above configuration, an annular groove 31e is defined in the needle base 3 between the tip base 31a, flange portion 31b, base portion 30, and first rib 31c. When the protective cover 10 is attached to the needle base 3, the first projection 11f and second projection 11g of the protective cover 10, which will be described later, fit into this annular groove 31e. In this embodiment, the annular groove 31e corresponds to a recess.

[0036] Furthermore, the four second ribs 31d project radially outward from the tip base 31a, extend to the left from the flange portion 31b, and then have a shape in which the amount of projection from the tip base 31a decreases along the way. Each of the four second ribs 31d is positioned such that, when viewed from the axial direction of the needle base 3, its center coincides with the center of each of the four first ribs 31c. In other words, the four second ribs 31d are positioned to have four-fold rotational symmetry about the central axis of the needle base 3.

[0037] A notch 31f is formed in the middle of each second rib 31d. When the protective cap 6, which will be described later, is attached to the needle base 3, the annular projection 6b of the protective cap 6, which will be described later, fits into this notch 31f.

[0038] On the other hand, as shown in Figure 3B, three holes 32a to 32c are formed inside the needle base 3, and these holes 32a to 32c are in communication with each other. Hole 32a is formed with a circular cross-section when viewed from the axial direction, extends from the left end of the tip base 31a to the right, and is configured to become smaller in diameter as it extends to the right. The injection needle 2 is attached to the needle base 3 by being inserted into this hole 32a.

[0039] Furthermore, hole 32c is formed with a circular cross-section when viewed from the axial direction, extends from the right end of the base 30 to the left, and is configured to become smaller in diameter towards the left. The syringe 4 is attached to the needle base 3 by being inserted into this hole 32c. Hole 32b extends to connect holes 32a and 32c. When the syringe set 1 is used, the drug solution in the syringe 4 is delivered to the injection needle 2 side through hole 32b.

[0040] Next, the protective cover 10 will be described with reference to Figures 4-16. Figure 4 is a front view of the protective cover 10, and in the following description, the left side of Figure 4 will be referred to as "left," the right side as "right," the top as "top," the bottom as "bottom," the front as "front," and the back as "back."

[0041] The protective cover 10 is for protecting the injection needle 2 when transporting the syringe set 1. In this embodiment, the protective cover 10 corresponds to a protective device. The protective cover 10 comprises a mounting portion 11, a hinge portion 12, and a protective cover portion 13, and these elements 11 to 13 are integrally constructed.

[0042] In this protective cover 10, the protective cover portion 13 is configured to be rotatable between the uncovered position shown in Figure 1, the covered position shown in Figure 12A, and the locked position shown in Figure 15A.

[0043] The mounting portion 11 is for attaching the protective cover 10 to the needle base 3. The mounting portion 11 has a base portion 11a and a cylindrical portion 11b. The base portion 11a is formed in a plate shape, and a locking portion 11c and a rib 11d are provided at its left end.

[0044] The locking portion 11c protrudes to the left from the base portion 11a and is thinner than the base portion 11a. The front and rear ends of the upper surface of the locking portion 11c are sloped downwards. When the protective cover 10 is in the locked position, the locking claws 13d, 13d of the protective cover portion 13 are snap-fitted into the locking portion 11c, as will be described later. The rib 11d extends diagonally downwards from the center of the locking portion 11c to the cylindrical portion 11b.

[0045] The cylindrical portion 11b protrudes downward from the center of the base portion 11a and has an inner hole 11e. This inner hole 11e extends vertically through the cylindrical portion 11b and the base portion 11a, and the needle base 3 is inserted into this inner hole 11e when the protective cover 10 is attached to the needle base 3.

[0046] The inner bore 11e has a circular cross-section when viewed from above, and its upper portion is formed as a counterbore with a larger diameter than its lower portion. As shown in Figures 5 and 7, a pair of first protrusions 11f, 11f, a pair of second protrusions 11g, 11g, and eight third protrusions 11h are formed on the inner circumferential surface of the inner bore 11e.

[0047] In this embodiment, the first projection 11f corresponds to the convex portion and the first convex portion, the second projection 11g corresponds to the convex portion and the second convex portion, and the third projection 11h corresponds to the other convex portion.

[0048] The pair of first projections 11f, 11f are arranged to have twofold rotational symmetry about the central axis of the inner hole 11e, as shown in Figures 5-7 and 9. The pair of first projections 11f, 11f are provided opposite each other at the same height on the inner surface of the inner hole 11e and protrude diagonally upward from the inner surface of the inner hole 11e toward the center.

[0049] Furthermore, the pair of second protrusions 11g, 11g are arranged to have twofold rotational symmetry around the central axis of the inner bore 11e, as shown in Figures 5 and 7. In addition, the four protrusions 11f, 11f, 11g, 11g are arranged at equal intervals from each other around the central axis of the inner bore 11e.

[0050] The pair of second projections 11g, 11g are positioned opposite each other at the same height as the pair of first projections 11f, 11f on the inner circumferential surface of the inner bore 11e, and protrude laterally from the inner circumferential surface of the inner bore 11e toward the center.

[0051] Furthermore, as shown in Figure 7, the eight third projections 11h are arranged at equal intervals in the circumferential direction at positions below the first projections 11f and second projections 11g on the inner circumferential surface of the inner bore 11e. Each third projection 11h has an arc-shaped cross-section when viewed from the front.

[0052] In this syringe set 1, when the mounting portion 11 of the protective cover 10 is attached to the needle base 3, the needle base 3 is inserted into the cylindrical portion 11b of the mounting portion 11 from below. At that time, the tip base 31a of the needle base 3 moves upward while overcoming a pair of second protrusions 11g, 11g and a pair of first protrusions 11f, 11f, so that the mounting portion 11 of the protective cover 10 is attached to the needle base 3, as shown in Figure 1.

[0053] Then, when the mounting portion 11 of the protective cover 10 is attached to the needle base 3, as shown in Figure 9, the pair of first projections 11f, 11f fit into the annular groove 31e with their tips sliding against the side surface 31b1 of the flange portion 31b. At this time, the tips of the pair of first projections 11f, 11f are spaced apart from the top surface of the first rib 31c.

[0054] Furthermore, as shown in Figure 10, the pair of second projections 11g, 11g are fitted into the annular groove 31e with their tips sliding against the end face 30b of the base 30. At this time, the tips of the pair of second projections 11g, 11g are spaced apart from the top surface of the first rib 31c described above.

[0055] Furthermore, the eight third protrusions 11h are fitted into the annular groove 30a of the needle base 3 in a sliding contact state. In addition, the lower end of the mounting portion 11 of the protective cover 10 slides against the stepped portion 30c of the base portion 30, thereby suppressing rattling of the needle base 3 relative to the mounting portion 11 when the needle base 3 is attached to the mounting portion 11.

[0056] With the above configuration, the mounting portion 11 is attached to the needle base 3 in a manner that prevents it from coming off and allows it to rotate freely around the central axis of the needle base 3.

[0057] On the other hand, the hinge portion 12 is provided between the right end of the mounting portion 11 and the upper left end of the protective cover portion 13, and the mounting portion 11 and the protective cover portion 13 are connected to each other via the hinge portion 12. This hinge portion 12 rotates the protective cover portion 13 between the uncovered position and the covered position when an external force acts on the protective cover portion 13.

[0058] As shown in Figure 11, the hinge portion 12 comprises a pair of outer hinge portions 12a, 12a and an inner hinge portion 12b. The pair of outer hinge portions 12a, 12a extend between the right end of the mounting portion 11 and the upper left end of the protective cover portion 13, with a gap between them in the front-rear direction.

[0059] Each of the outer hinge portions 12a, 12a has a shape that extends in a plate-like manner from the mounting portion 11 to the protective cover portion 13, and then becomes a thin plate with a thinner wall thickness. The thin plate-like end of each of these outer hinge portions 12a is a bent portion 12c, and when the protective cover portion 13 rotates, each outer hinge portion 12a is configured to bend and deform around this bent portion 12c. As a result, the protective cover portion 13 is configured to rotate freely around a pivot axis that extends along the bent portion 12c.

[0060] A pair of protrusions 13m, 13m are provided at the connection point between the protective cover portion 13 and the outer hinge portions 12a, 12a (only one is shown). Each protrusion 13m has parallel left and right end faces and extends for a predetermined length in the vertical direction of the protective cover portion 13.

[0061] Furthermore, the inner hinge portion 12b is positioned between the pair of outer hinge portions 12a, 12a when viewed from above, and extends between the portion of the mounting portion 11 below the outer hinge portion 12a and the portion of the protective cover portion 13 below the outer hinge portion 12a.

[0062] The inner hinge portion 12b comprises a first hinge portion 12b1 and a second hinge portion 12b2. These first and second hinge portions 12b1 and 12b2 are plate-shaped and integrally formed with each other, and one end of each is connected such that the angle between them is acute. The other end of the first hinge portion 12b1 is connected to the mounting portion 11, and the other end of the second hinge portion 12b2 is connected to the protective cover portion 13.

[0063] On the other hand, as shown in Figures 4 and 6, the protective cover portion 13 is equipped with a pair of front and rear side walls 13a, 13a, a lateral side wall 13b, and a bottom wall 13c, and is constructed in a box shape by these four walls 13a to 13c. The pair of side walls 13a, 13a extend vertically while facing each other, and the distance between them gradually decreases as one approaches the bottom, and the distance between them changes in two stages. Specifically, the distance between the upper parts of the pair of side walls 13a, 13a is wider than that between the lower parts.

[0064] The lateral wall 13b extends between the left ends of the pair of side walls 13a, 13a, and the lower wall 13c extends between the lower ends of the pair of side walls 13a, 13a.

[0065] Furthermore, a pair of locking claws 13d, 13d are provided at the upper right ends of the pair of side walls 13a, 13a. These locking claws 13d, 13d protrude upward and then extend diagonally downward in a direction toward each other.

[0066] This protective cover portion 13 is configured to rotate between the uncovered position shown in Figure 1 and the covered position shown in Figure 12A via the hinge portion 12. When the protective cover portion 13 rotates in this manner, the hinge portion 12 operates as described below.

[0067] For example, when the protective cover portion 13 is in the uncovered position shown in Figure 1, if, for example, a user presses the protective cover portion 13 counterclockwise in Figure 1, the outer hinge portions 12a, 12a begin to bend around the bent portions 12c, 12c. Consequently, the inner hinge portion 12b undergoes elastic deformation such that the angle between the first hinge portion 12b1 and the second hinge portion 12b2 (hereinafter referred to as the "hinge angle") increases, and as a result, a biasing force acts on the protective cover portion 13 that tries to push it back.

[0068] As the protective cover portion 13 rotates further counterclockwise in Figure 1, resisting this biasing force, the protective cover portion 13 rotates counterclockwise in Figure 1, while the biasing force of the inner hinge portion 12b, which is trying to return to its original elastic state, causes the outer hinge portions 12a, 12a to bend and deform around the bent portions 12c, 12c. Finally, the protective cover portion 13 reaches the cover position shown in Figure 12A.

[0069] When the protective cover portion 13 is in the cover position, the outer hinge portions 12a, 12a are folded in half around the bent portion 12c, as shown in Figure 13. Furthermore, the protective cover portion 13 is held in the cover position by the biasing force of the inner hinge portion 12b, unless an external force is applied. In this way, when the protective cover portion 13 is in the cover position, the entire injection needle 2 is covered by the protective cover portion 13, as shown in Figure 12B.

[0070] Furthermore, when the protective cover portion 13 is in the cover position, for example, if the user presses the protective cover portion 13 to the left side in Figure 12A, the hinge portion 12 and the protective cover portion 13 will elastically deform, causing the protective cover portion 13 to rotate to the locked position shown in Figure 15A.

[0071] As the protective cover portion 13 rotates to the locked position, the pair of locking claws 13d, 13d of the protective cover portion 13 elastically deform so that the gap between them widens, and overcome both the front and rear ends of the locking portion 11c, thereby snapping into place on the locking portion 11c as shown in Figure 16. As a result, the protective cover portion 13 is locked to the mounting portion 11 in a non-detachable state.

[0072] When the protective cover portion 13 is in the locked position, the entire injection needle 2 is covered by the protective cover portion 13, as shown in Figure 15B.

[0073] Furthermore, when the protective cover portion 13 is in the locked position, if an external force pushes the protective cover portion 13 to the left in Figure 15A, the lower end of the protective cover portion 13 will come into contact with the surface of the base portion 11a of the mounting portion 11, as shown in Figure 17 (see portion A in Figure 17). As a result, the protective cover portion 13 is held in the locked position, and contact between the protective cover portion 13 and the injection needle 2 is avoided.

[0074] Furthermore, when the protective cover portion 13 is in the locked position, if the protective cover portion 13 moves in the left-right direction in Figure 16, one of the locking claws 13d, 13d will come into contact with the locking portion 11c, thereby stopping the protective cover portion 13. This prevents damage to the protective cover portion 13.

[0075] As described above, according to the syringe set 1 of the first embodiment, the mounting portion 11 of the protective cover 10 is attached to the needle base 3 with the first projections 11f, 11f and the second projections 11g, 11g of the mounting portion 11 fitted into the annular groove 31e of the needle base 3. This annular groove 31e is formed in an annular shape along the circumferential direction on the outer surface of the needle base 3, and the first projections 11f, 11f and the second projections 11g, 11g protrude from the inner circumferential surface of the inner hole 11e of the mounting portion 11 toward the center.

[0076] This allows the mounting portion 11 to be rotatable relative to the central axis of the needle base 3, while ensuring smooth rotation. As a result, when using the protective cover 10, rotating the protective cover 10 relative to the needle base 3 makes it easier to cover the injection needle with the protective cover 10, thereby improving the convenience of using the protective cover 10. Furthermore, after the injection needle 2 and syringe 4 are attached to the needle base 3, when the drug solution is injected into the syringe, rotating the protective cover 10 around the central axis of the needle base 3 prevents the protective cover 10 from overlapping the markings on the syringe 4.

[0077] Furthermore, the first projections 11f, 11f are configured to slide against the side surface 31b1 of the flange portion 31b when fitted into the annular groove 31e, and the second projections 11g, 11g are configured to slide against the end surface 30b of the base portion 30 when fitted into the annular groove 31e. This allows the mounting portion 11 to be firmly attached to the needle base 3 in a way that prevents it from coming loose.

[0078] Furthermore, since the first projections 11f, 11f and the second projections 11g, 11g are arranged at equal intervals from each other around the central axis of the inner hole 11e, the smoothness of the rotation of the mounting portion 11 and the needle base 3 relative to each other around the central axis of the needle base 3 can be further improved.

[0079] In addition, the mounting portion 11 is attached to the needle base 3 such that its eight third projections 11h are fitted into the annular groove 30a of the needle base 3 while sliding against it. These third projections 11h are positioned spaced apart in the axial direction of the mounting portion 11 from the first projections 11f, 11f and the second projections 11g, 11g. This prevents the mounting portion 11 and the needle base 3 from rattling relative to each other when they rotate relative to each other around the central axis of the needle base 3, and ensures a more stable rotation state.

[0080] In addition, in the syringe set 1 of the first embodiment, a protective cap 6 shown in Figures 18-20 may be used. This protective cap 6 is attached to the syringe set 1 in advance to cover the injection needle 2 before the drug solution is filled into the syringe, and has a base portion 6a. This base portion 6a is formed in a tapered cylindrical shape, with its tip closed and its base end open.

[0081] An annular projection 6b is formed on the inner circumferential surface of the base portion 6a on the base end side. This annular projection 6b has a circular arc cross-section and extends along the circumferential direction. When the protective cap 6 is attached to the syringe set 1, as shown in Figure 20, the annular projection 6b fits into the notch 31f of the needle base 3, covering the injection needle 2. As a result, the protective cap 6 is attached to the syringe set 1 in a way that prevents it from coming off.

[0082] Thus, if the protective cap 6 is attached to the syringe set 1 before the drug solution is filled, it is possible to avoid a situation where the protective cover 13 malfunctions for some reason before the drug solution is filled, resulting in the injection needle 2 being unprotected. Furthermore, even if the protective cover 10 is accidentally rotated counterclockwise from the state shown in Figure 18, it is possible to prevent the protective cover 10 from rotating to the locked position.

[0083] In the first embodiment, the first projections 11f and 2 projections 11g, which serve as a pair of first and second protrusions, are provided on the mounting portion 11, and the annular groove 31e, which serves as a recess, is provided on the needle base 3. However, conversely, the pair of first and second protrusions may be provided on the needle base 3, and the recess may be provided on the mounting portion 11.

[0084] Furthermore, while the first embodiment is an example in which multiple other protrusions, namely the third projection 11h, are provided on the mounting portion 11 and other recesses, namely the annular groove 30a, are provided on the needle base 3, the opposite may also be true: multiple other protrusions may be provided on the needle base 3 and other recesses on the mounting portion 11.

[0085] Furthermore, the number of the third projections 11h, which are multiple other protrusions, is not limited to eight, but may be two to seven or nine or more. In addition, the third projections 11h may be positioned above the first projections 11f and second projections 11g on the inner circumferential surface of the inner hole 11e, in which case the annular groove 30a should be positioned on the tip base 31a side of the needle base 3.

[0086] Furthermore, while the first embodiment uses an annular groove 31e with a rectangular cross-section as the recess, the recess is not limited to this and can be any groove formed in an annular shape along the circumferential direction. For example, a groove with a trapezoidal cross-section may be used as the recess, and a pair of first protrusions may slide against one wall in the axial direction of the groove, and a pair of second protrusions may slide against the other wall in the axial direction of the groove.

[0087] On the other hand, the first embodiment is an example in which a pair of first protrusions 11f, 11f having two rotational symmetries are used as the pair of first protrusions. However, the pair of first protrusions of the present invention are not limited to these, and may be any that extend on the inner circumferential surface of the mounting portion to include positions opposite each other on either side of the center of the inner hole, or that extend on the outer circumferential surface of the needle base to include positions opposite each other on either side of the center of the needle base. For example, the length of the first protrusions 11f, 11f extending in one circumferential direction may be different from the length of the first protrusions 11f, 11f extending in the other circumferential direction.

[0088] Furthermore, while the first embodiment uses a pair of second projections 11g, 11g having two rotational symmetries as the second protrusions, the pair of second protrusions of the present invention are not limited to these, and may be any projections that extend on the inner circumferential surface of the mounting portion to include positions opposite each other on either side of the center of the inner hole, or on the outer circumferential surface of the needle base to include positions opposite each other on either side of the center of the needle base. For example, the length of one circumferential extension of the second projections 11g, 11g may be different from the length of the other circumferential extension of the second projections 11g, 11g.

[0089] Furthermore, while the first embodiment uses first projections 11f, 11f and second projections 11g, 11g having twofold rotational symmetry as a pair of first and second projections, the pair of first and second projections of the present invention are not limited to these, and it is sufficient if at least one of the pair of first and second projections has twofold rotational symmetry. For example, the first projections 11f, 11f may be configured to have twofold rotational symmetry only, or the second projections 11g, 11g may be configured to have twofold rotational symmetry only.

[0090] On the other hand, the first embodiment is an example in which the protective cover 10 as a protective device is attached to the needle base 3 in a configuration in which the needle base 3 is fitted into the inner hole 11e of the mounting portion 11 of the protective cover 10. However, the configuration for attaching the protective device to the needle base is not limited to this, and any configuration in which the protective device can be attached to the needle base is acceptable. For example, the mounting portion of the protective device may be the configuration described in Japanese Patent Application Publication No. 2019-198364.

[0091] Furthermore, while the first embodiment is an example in which the protective cover portion covers the entire injection needle 2 when it is in the cover position, the protective cover portion 13 may be configured to cover a predetermined portion of the injection needle 2, including at least the needle tip, when it is in the cover position. For example, the protective cover portion 13 may be configured to cover the portion of the injection needle 2 from the needle tip to the area before the base of the injection needle 2.

[0092] Next, the syringe set 1A of the second embodiment of the present invention will be described with reference to Figures 21-22. The syringe set 1A of the second embodiment differs from the syringe set 1 of the first embodiment only in the configuration of the protective cover 10A (protective device), so the following description will focus on the differences. In addition, the same reference numerals are used for components identical to those in the first embodiment, and their descriptions will be omitted.

[0093] As shown in Figures 21-22, in the protective cover 10A of this embodiment, a central projection 11k is provided on the base 11a of the mounting portion 11. This central projection 11k protrudes upward from the base 11a in the portion between the hinge portion 12 and the inner hole 11e on the base 11a.

[0094] The central projection 11k is a horizontally elongated plate-like shape in the front-to-back direction, with rounded edges on its upper edge and the four corners when viewed from above. In this embodiment, the central projection 11k corresponds to the temporary fixing projection.

[0095] Furthermore, the front and rear pair of side walls 13a, 13a of the protective cover portion 13 are a pair of side walls 13a1, 13a1 on the hinge portion 12 side that are narrower than the other portions. Inside the protective cover portion 13, these side walls 13a1, 13a1 and the lateral side wall 13b form a recess 13k with a rectangular cross-section.

[0096] This recess 13k extends in the direction of extension of the protective cover portion 13, and the width of the recess 13k, i.e., the width between the side walls 13a1, 13a1, is configured to be slightly narrower than the width of the central projection 11k. In this embodiment, the recess 13k corresponds to a temporary fixing recess.

[0097] In this protective cover 10A, when the protective cover portion 13 rotates from the uncovered position to the covered position, the central projection 11k begins to be pressed into the recess 13k at a position slightly before the covered position. When the protective cover portion 13 is in the covered position, as shown in Figure 22, the central projection 11k is pressed into the side walls 13a1, 13a1 on both sides of the recess 13k and also comes into contact with the lateral side wall 13b.

[0098] As a result, when the protective cover portion 13 is in the cover position, the protective cover portion 13 will be held in the cover position without rotating to the locked position or the uncovered position, unless any external force acts on the protective cover portion 13.

[0099] As described above, according to the syringe set 1A of the second embodiment, when the protective cover portion 13 is rotated by the user from the uncovered position to the covered position, the central projection 11k of the mounting portion 11 is pressed into the recess 13k of the protective cover portion 13 from a position prior to the covered position, while sliding against the pair of side walls 13a1, 13a1 in the recess 13k of the protective cover portion 13.

[0100] As a result, the user can detect that the protective cover portion 13 has moved to a position close to the cover position due to the resistance when the central projection 11k is pressed into the pair of side walls 13a1, 13a1 of the recess 13k, and can avoid the protective cover portion 13 being rotated to the cover position by excessive force.

[0101] Furthermore, when the protective cover portion 13 is in the cover position, the central projection 11k is pressed into the recess 13k, so that the protective cover portion 13 will remain in the cover position unless the user intentionally rotates it from the cover position to the uncovered position. As a result, the protective function of the injection needle 2 can be enhanced.

[0102] In addition, when the protective cover portion 13 is in the cover position, the central projection 11k of the mounting portion 11 comes into contact with the lateral wall 13b of the recess 13k. As a result, the protective cover portion 13 will remain in the cover position unless the user intentionally rotates it from the cover position to the locked position. Consequently, it is possible to prevent the protective cover portion 13 from unintentionally rotating to the locked position due to external forces or the like.

[0103] In the second embodiment, a central projection 11k and a recess 13k are used as the temporary fixing projection and recess, respectively. However, the temporary fixing projection and recess of the present invention are not limited to these, and any part that is pressed into the temporary fixing recess while sliding against the pair of side walls of the recess of the protective cover from a position prior to the cover position when the protective cover rotates from the non-cover position to the cover position is acceptable. For example, a cylindrical shape may be used as the temporary fixing projection, and a shape with a circular arc cross-section may be used as the temporary fixing recess.

[0104] Next, the syringe set 1B of the third embodiment of the present invention will be described with reference to Figures 23 to 25B. The syringe set 1B of the third embodiment differs from the syringe set 1 of the first embodiment only in the configuration of the protective cover 10B (protective device), so the following description will focus on the differences. Also, components identical to those in the first embodiment will be given the same reference numerals, and their descriptions will be omitted.

[0105] In the protective cover 10B of this embodiment, as shown in Figure 23, a pair of front and rear protrusions 11m, 11m are provided on the base 11a of the mounting portion 11. These protrusions 11m, 11m are prismatic in shape, protruding upward from the base 11a, and are positioned at the front and rear ends of the base 11a, respectively. Each of the protrusions 11m, 11m has a rounded chamfered shape at its upper end and both side ends. In this embodiment, the protrusions 11m correspond to the contact portion.

[0106] In this protective cover 10B, when the protective cover portion 13 rotates from the uncovered position to the covered position, as shown in Figure 24A, when the protective cover portion 13 reaches a position in front of the covered position, the lower edges 13ax, 13ax (only one shown) of the side wall 13a of the protective cover portion 13 come into close proximity to the protrusions 11m, 11m (only one shown) of the mounting portion 11.

[0107] Then, when the protective cover portion 13 rotates counterclockwise in the figure from the position shown in Figure 24A to the position shown in Figure 24B, the lower edges 13ax, 13ax of the side wall 13a come into contact with the upper left ends of the projections 11m, 11m. Furthermore, when the protective cover portion 13 rotates counterclockwise in the figure from the position shown in Figure 24B, the contact between the lower edges 13ax, 13ax of the side wall 13a and the projections 11m, 11m of the mounting portion 11 is released. In this embodiment, the lower edge 13ax corresponds to the first contact portion.

[0108] When the protective cover portion 13 reaches the cover position, as shown in Figure 25A, the protrusions 11m, 11m of the mounting portion 11 are no longer in contact with the side wall 13a of the protective cover portion 13, and are in close proximity to the protrusions 13m, 13m of the protective cover portion 13. In this embodiment, the protrusion 13m corresponds to the second contact portion.

[0109] Furthermore, as shown in Figure 25B, when the protective cover portion 13 rotates from the cover position to the locked position, the protrusions 13m, 13m of the protective cover portion 13 come into contact with the protrusions 11m, 11m of the mounting portion 11. Therefore, the protective cover portion 13 is not accidentally rotated counterclockwise from the locked position as shown in the figure, and is held in the locked position.

[0110] As described above, according to the syringe set 1 of the third embodiment, when the protective cover portion 13 is rotated by the user from the uncovered position to the covered position, the lower edges 13ax, 13ax of the protective cover portion 13 come into contact with the projections 11m, 11m of the mounting portion 11 at a position in front of the covered position. As a result, the user can sense that the protective cover portion 13 has moved to a position in front of the covered position due to the pressure / impact when the lower edges 13ax, 13ax of the protective cover portion 13 come into contact with the projections 11m, 11m, and can avoid rotating the protective cover portion 13 to the covered position by excessive force.

[0111] Furthermore, the protective cover portion 13 is configured to be pressed by the hinge portion 12 to the opposite side of the uncovered position when it is in the covered position. As a result, the protective cover portion 13 will remain in the covered position unless the user intentionally rotates the protective cover portion 13 from the covered position to the uncovered position, or unless a large external force is applied to it. Consequently, the protective function of the injection needle 2 can be enhanced.

[0112] Furthermore, when the protective cover portion 13 rotates from the cover position to the locked position, the protrusions 11m, 11m of the mounting portion 11 come into contact with the protrusions 13m, 13m of the protective cover portion 13 so that the protective cover portion 13 is held in the locked position. As a result, the protective cover portion 13 is held in the locked position without accidentally rotating counterclockwise as shown in the figure. Consequently, the protective function of the injection needle 2 can be further enhanced.

[0113] In the third embodiment, a pair of protrusions 11m, 11m are used as the contacted portion. However, the non-contact portion of the present invention is not limited to these, and any non-contact portion of the protective cover portion that contacts the first contact portion of the protective cover portion at a position in front of the cover position when the protective cover portion rotates from the non-cover position to the cover position is acceptable. For example, only one of the pair of protrusions 11m, 11m may be used as the non-contact portion.

[0114] Furthermore, the third embodiment is an example in which the lower edges 13ax, 13ax of the protective cover portion 13 are used as the first contact portion of the protective cover portion. However, the first contact portion of the present invention is not limited to these, and it is sufficient if it contacts the contact portion of the mounting portion at a position in front of the cover position when the protective cover portion rotates from the non-cover position to the cover position. For example, only one of the lower edges 13ax, 13ax of the protective cover portion 13 may be used as the first contact portion, in which case one of the lower edges 13ax should be configured to contact one of the projections 11m.

[0115] Furthermore, the third embodiment is an example in which the projections 13m, 13m of the protective cover portion 13 are used as the second contact portion of the protective cover portion. However, the second contact portion of the present invention is not limited to these, and any portion that contacts the contact portion of the mounting portion when the protective cover portion rotates from the cover position to the locked position is acceptable. For example, one of the pair of projections 13m, 13m may be omitted, and the remaining projection 13m may be used as the second contact portion.

[0116] Next, the syringe set 1C of the fourth embodiment of the present invention will be described with reference to Figures 26-29. The syringe set 1C of the fourth embodiment differs from the syringe set 1A of the second embodiment only in the configuration of a part of the protective cover 10C (protective device), so the following description will focus on the differences. Also, the same reference numerals are used for components that are the same as in the second embodiment, and their descriptions will be omitted.

[0117] As shown in Figures 26-29, in the case of the protective cover 10C of this embodiment, the mounting portion 11 has a base portion 11n, and the width of this base portion 11n in the front-rear direction is wider than that of the base portion 11a of the protective cover 10A. This is to make it easier for the user to attach the mounting portion 11 of the protective cover 10C to the needle base 3, by pressing the mounting portion 11 with their finger while fitting the needle base 3 into the cylindrical portion 11b.

[0118] Furthermore, in the case of the protective cover 10C of this embodiment, a locking projection 11p is provided on the base 11n of the mounting portion 11, instead of the projection 11k of the protective cover 10A. This locking projection 11p protrudes upward from the base 11n in the portion between the hinge portion 12 and the inner hole 11e on the base 11n.

[0119] The locking projection 11p is a horizontally elongated plate-like structure in the front-to-back direction, and its width in the front-to-back direction is set to be smaller by a predetermined value than the width between the inner surfaces of the left and right side walls 13a1, 13a1 of the recess 13k. The locking projection 11p has a pair of projections 11r, 11r, and these projections 11r, 11r protrude from the left and right side walls of the locking projection 11p. The outer surface of each of the projections 11r, 11r is formed in a circular arc shape when viewed from the left and right directions.

[0120] Furthermore, a pair of protrusions 13r, 13r are provided at the hinge 12-side ends of the pair of side walls 13a1, 13a1 in the protective cover portion 13. These pair of protrusions 13r, 13r extend for a predetermined length in the front-rear direction, and their outer surfaces are formed in a circular arc shape when viewed from the left-right direction. In this embodiment, protrusion 11r corresponds to the first temporary fixing projection, and protrusion 13r corresponds to the second temporary fixing projection.

[0121] In this protective cover 10C, when the protective cover portion 13 rotates from the uncovered position to the covered position, the projections 13r, 13r of the protective cover portion 13 come into contact with the projections 11r, 11r of the locking projection 11p at a position slightly before the covered position (not shown). Then, when the protective cover portion 13 rotates from that position to the covered position, the projections 13r, 13r of the protective cover portion 13 will move over the projections 11r, 11r of the locking projection 11p. Furthermore, when the protective cover portion 13 is in the covered position, as shown in Figure 29, the projections 13r, 13r are locked to the projections 11r, 11r of the locking projection 11p, and the locking projection 11p comes into contact with the lateral wall 13b (not shown).

[0122] As a result, when the protective cover portion 13 is in the cover position, the protective cover portion 13 will be held in the cover position without rotating to the locked position or the uncovered position, unless any external force acts on the protective cover portion 13.

[0123] As described above, according to the syringe set 1C of the fourth embodiment, the base portion 11n of the mounting portion 11 has a width in the front-rear direction that is wider than the base portion 11a of the protective cover 10A. This makes it easier for the user to attach the mounting portion 11 of the protective cover 10C to the needle base 3 by pressing the mounting portion 11 with their finger while fitting the needle base 3 into the cylindrical portion 11b.

[0124] Furthermore, when the protective cover portion 13 is rotated by the user from the uncovered position to the covered position, the protrusions 13r, 13r of the protective cover portion 13 come into contact with the protrusions 11r, 11r of the locking protrusions 11p of the mounting portion 11 from a position prior to the covered position, overcome these protrusions, and are then locked in place by the protrusions 11r, 11r.

[0125] As a result, the user can detect that the protective cover portion 13 has moved closer to the cover position due to the resistance when the projections 13r, 13r of the protective cover portion 13 come into contact with and overcome the projections 11r, 11r of the locking projections 11p, thereby preventing the protective cover portion 13 from being rotated to the cover position by excessive force.

[0126] Furthermore, by adjusting the height of the protrusions 13r, 13r and 11r, 11r, the resistance when the protrusions 13r, 13r overcome the protrusions 11r, 11r can be adjusted.

[0127] Furthermore, when the protective cover portion 13 is in the cover position, the protrusions 13r, 13r are locked by the protrusions 11r, 11r, and the locking protrusion 11p is in contact with the lateral wall 13b. As a result, the protective cover portion 13 will remain in the cover position unless the user intentionally rotates it from the cover position to the uncovered position. Consequently, the protective function of the injection needle 2 can be enhanced.

[0128] In addition, when the protective cover portion 13 is in the cover position, the locking projection 11p of the mounting portion 11 comes into contact with the lateral wall 13b. As a result, the protective cover portion 13 will remain in the cover position unless the user intentionally rotates it from the cover position to the locked position. Consequently, it is possible to prevent the protective cover portion 13 from unintentionally rotating to the locked position due to external forces or the like.

[0129] In addition, in the syringe set 1C of the fourth embodiment, when the protective cover portion 13 rotates to the cover position, the projections 13r, 13r of the protective cover portion 13 may be configured such that, after overcoming the projections 11r, 11r, the projections 11r, 11r are not in contact with the projections 11r, 11r, and the projections 11r, 11r are held from both sides by the inner surfaces of the pair of side walls 13a1, 13a1, thereby holding the protective cover portion 13 in the cover position relative to the mounting portion 11. Alternatively, the protective cover portion 13 may be configured such that, after overcoming the projections 13r, 13r of the protective cover portion 13, the projections 13r, 13r are not in contact with the projections 11r, 11r, and the left and right side walls of the locking projection 11p are held from both sides, thereby holding the protective cover portion 13 in the cover position relative to the mounting portion 11. [Explanation of Symbols]

[0130] 1 Syringe set 2 Syringe needle 3 Needle base 30a Annular groove (other recess) 31e Annular groove (recess) 4 Syringes 10. Protective cover (protective equipment) 11 Mounting part 11e Inner hole 11f First projection (convex part, first convex part) 11g Second projection (convex part, second convex part) 11h Third projection (other protrusions) 12. Hinge section 13. Protective cover section 13a1 side wall 1A Syringe Set 10A protective cover (protective equipment) 11k central projection (temporary fixing protrusion) 13k recess (temporary fixing recess) 1B Syringe Set 10B Protective cover (protective equipment) 11m protrusion (abutted part) 13ax Lower edge (1st contact part) 13m protrusion (second contact part) 1C Syringe Set 10C Protective Cover (Protective Equipment) 11r projection (first temporary fixing projection) 13r projection (second temporary fixing projection)

Claims

1. a needle base to which an injection needle and a syringe are attached; a protector having an attachment portion attached to the needle hub and configured to cover and protect the injection needle, The hub has an outer peripheral surface formed with one of a recess and a plurality of protrusions that can be fitted together, the mounting portion has an inner hole in which the other of the recessed portion and the plurality of protruding portions is formed on an inner circumferential surface, and is attached to the hub in a state in which the recessed portion and the plurality of protruding portions are fitted together, the recess is formed in an annular shape along the circumferential direction of the outer circumferential surface of the hub or the inner circumferential surface of the attachment portion, the plurality of protrusions include a pair of first protrusions whose tip portions come into sliding contact with one wall of the recess in the axial direction when fitted in the recess, and a pair of second protrusions each disposed between the pair of first protrusions and whose tip portions come into sliding contact with the other wall of the recess in the axial direction when fitted in the recess, the pair of first convex portions and the pair of second convex portions extend to include positions on the inner peripheral surface of the mounting portion that face each other across the center of the inner hole, or extend to include positions on the outer peripheral surface of the needle hub that face each other across the center of the needle hub.

2. The syringe set according to claim 1, At least one of the pair of first convex portions and the pair of second convex portions has two-fold rotational symmetry around the central axis of the inner hole of the mounting portion or the needle base.

3. The syringe set according to claim 2, a syringe set characterized in that each of the pair of first protrusions and each of the pair of second protrusions are arranged at equal intervals from each other around the inner hole of the mounting portion or the central axis of the needle base.

4. The syringe set according to any one of claims 1 to 3, a plurality of other recesses and other protrusions that can be fitted together are arranged on the outer peripheral surface of the needle hub and the inner peripheral surface of the mounting portion, the other recesses and other protrusions being spaced apart in the axial direction from the recesses and the plurality of protrusions.

5. The syringe set according to claim 1, The protective equipment is a protective cover part configured to be movable among an uncovered position that does not cover the injection needle, a covered position that covers a predetermined portion of the injection needle including at least the needle tip, and a locked position that is located on the opposite side of the uncovered position with respect to the covered position and is engaged with the mounting part; a hinge portion provided between the protective cover portion and the mounting portion and configured to rotate the protective cover portion between the non-cover position and the cover position; and the protective cover portion has a temporary fastening recess on an inner surface on the hinge portion side, the temporary fastening recess having a pair of side walls extending along a rotation direction of the protective cover portion, the mounting portion further has a temporary fastening protrusion that is press-fit into the temporary fastening recess of the protective cover portion while being in sliding contact with the pair of side walls of the temporary fastening recess of the protective cover portion from a position before the covering position when the protective cover portion rotates from the non-covering position to the covering position.

6. The syringe set according to claim 1, The protective equipment is a protective cover part configured to be movable among an uncovered position that does not cover the injection needle, a covered position that covers a predetermined portion of the injection needle including at least the needle tip, and a locked position that is located on the opposite side of the uncovered position with respect to the covered position and is engaged with the mounting part; a hinge portion provided between the protective cover portion and the mounting portion, configured to rotate the protective cover portion between the non-cover position and the cover position, and to press the protective cover portion toward an opposite side to the non-cover position when the protective cover portion is in the cover position; and the mounting portion further has an abutment portion with which a first abutment portion of the protective cover portion abuts at a position closer to the cover position when the protective cover portion rotates from the non-cover position to the cover position.

7. The syringe set according to claim 6, the abutted portion of the mounting portion is configured to abut against a second abutment portion different from the first abutment portion of the protective cover portion so that the protective cover portion is held in the locked position when the protective cover portion rotates from the cover position to the locked position.

8. The syringe set according to claim 1, The protective equipment is a protective cover part configured to be movable among an uncovered position that does not cover the injection needle, a covered position that covers a predetermined portion of the injection needle including at least the needle tip, and a locked position that is located on the opposite side of the uncovered position with respect to the covered position and is engaged with the mounting part; a hinge portion provided between the protective cover portion and the mounting portion and configured to rotate the protective cover portion between the non-cover position and the cover position; and the mounting portion has a pair of first temporary fastening protrusions provided to face each other, the protective cover portion has a pair of second temporary fastening protrusions that are provided so as to come into contact with the pair of first temporary fastening protrusions of the mounting portion from a position before the cover position and then climb over the pair of first temporary fastening protrusions when the protective cover portion rotates from the non-cover position to the cover position, The syringe set, wherein the protective cover portion is held in the cover position relative to the mounting portion when in the cover position.

Images