Drug feeding device

Abstract

To suppress discharge of two drugs together.SOLUTION: Each of a plurality of first projections 122 is formed to be capable of pressurizing a drug housed in a gap 124 and transporting the drug to an outlet when a rotor 120 rotates. In a tip face 122s positioned outside the rotor 120 in a radial direction in each of the plurality of first projections 122, a first recess 122c extending toward inside in the radial direction is formed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a drug delivery device. [Background technology]

[0002] As a prior art document disclosing the configuration of a medicine supply device, Japanese Patent Application Laid-Open No. 2014-144207 ( The medicine supply device described in Patent Document 1 includes a container, a rotor, and a The rotor is provided with block sections at intervals on its side, and the gaps between the block sections define drug-containing grooves. As the rotor rotates, a part of the rotor comes into contact with a part of the partition member, causing the partition member to move and displacing the drug on the partition member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-144207 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the drug supply device described in Patent Document 1, drug transported above the drug discharge port may become stuck to the bottom surface of the block section due to static electricity, and may be discharged from the drug discharge port together with the next drug transported above the drug discharge port.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a medicine supplying device that can prevent two medicines from being discharged together. [Means for solving the problem]

[0006] The medicine supply device of the present invention includes a medicine storage section, a rotor, a plurality of first protrusions, and a partition. The medicine storage section has a peripheral wall and an outlet, stores medicine inside the peripheral wall, and discharges the medicine from the outlet. The rotor is rotatably disposed inside the peripheral wall, and has a top surface portion inclined convexly upward and a peripheral surface portion adjacent to the top surface portion. The plurality of first protrusions are provided on the peripheral surface portion and positioned with gaps between them in the circumferential direction of the rotor. The partition portion is extended from the inner surface of the peripheral wall toward the peripheral surface portion above the outlet. Each of the plurality of first protrusions is formed so that, when the rotor rotates, it can press the medicine stored in the gap and convey it to the outlet. A first recess extending toward the inside in the radial direction is formed on a tip surface of each of the plurality of first protrusions located on the outer side in the radial direction of the rotor.

[0007] In one embodiment of the present invention, the peripheral surface portion has a second recess formed therein, the second recess being continuous with the first recess in the radial direction, and penetrating the peripheral surface portion in the radial direction.

[0008] In one embodiment of the present invention, an angle formed between a bottom surface of each of the plurality of first protrusions and inner side surfaces of the first recess that face each other in the circumferential direction is 90° or less. Effect of the Invention

[0009] According to the present invention, it is possible to prevent the two drugs from being excreted together. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a state in which a lid portion is open in a medicine supplying device according to an embodiment of the present invention; [Diagram 2] 2 is a plan view of the medicine supplying device of FIG. 1 as viewed from the direction of arrow II. [Diagram 3] 3 is a bottom view of the medicine supplying device of FIG. 1, as viewed in the direction of arrow III. [Figure 4]1 is a perspective view showing a medicine container in a medicine supplying device according to an embodiment of the present invention, with a part cut away. [Diagram 5] 1 is a perspective plan view showing a rotor in a medicine supply device according to an embodiment of the present invention. FIG. [Figure 6] 1 is a perspective view showing the appearance of a rotor of a medicine supplying device according to an embodiment of the present invention; [Figure 7] 1 is a perspective view of a rotor of a medicine supplying device according to an embodiment of the present invention, viewed from below. [Figure 8] 4 is a bottom view of the rotor of the medicine supplying device according to the embodiment of the present invention. FIG. [Figure 9] 4 is a side view showing the positional relationship between a rotor and a partition of the medicine supplying device according to the embodiment of the present invention. FIG. [Figure 10] 13 is a plan view showing a state in which a medicine container is clogged with medicine. FIG. [Figure 11] 11 is a side view showing a state immediately before the medicine is transported above the discharge port in the medicine supplying device according to the comparative example. FIG. [Figure 12] 13 is a side view showing a state in which medicines are being transported above a discharge port and are falling in the medicine supplying device according to the comparative example. FIG. [Figure 13] 13 is a side view showing a state in which a falling medicine is stuck to a bottom surface of a first protrusion due to static electricity in the medicine supplying device according to the comparative example. FIG. [Figure 14] FIG. 13 is a side view showing a state in which the next medicine is transported above the discharge port and two medicines are discharged together from the discharge port in the medicine supplying device according to the comparative example. [Figure 15] 1 is a side view showing a state in which medicines are being transported above a discharge port and are about to fall in the medicine supplying device according to the embodiment. FIG. [Figure 16] FIG. 11 is a side view illustrating a state in which a first protrusion has moved above falling medicines in the medicine supply device according to the embodiment. [Figure 17] FIG. 11 is a side view illustrating a state in which the medicine adhering to the bottom surface of the first protrusion is falling in the medicine supplying device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a medicine supply device according to one embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings are given the same reference characters and description thereof will not be repeated.

[0012] FIG. 1 is a perspective view showing a state where a cover part is open in a medicine supplying device according to one embodiment of the present invention. FIG. 2 is a plan view of the medicine supplying device of FIG. 1 as viewed from the direction of an arrow II. FIG. 3 is a bottom view of the medicine supplying device of FIG. 1 as viewed from the direction of an arrow III. FIG. 4 is a perspective view showing a medicine container part of the medicine supplying device according to one embodiment of the present invention with a part cut away. FIG. 5 is a plan view showing a see-through rotor of the medicine supplying device according to one embodiment of the present invention. FIGS. 4 and 5 show a state where a cover part is removed in the medicine supplying device. In FIG. 5, the rotor is shown by a dotted line.

[0013] As shown in Figs. 1 to 3, a medicine supplying device 100 according to one embodiment of the present invention includes a medicine containing section 110, a rotor 120, a cover section 130, and a partition section 140. The medicine containing section 110 has a peripheral wall 111 and an outlet 112, and contains a medicine inside the peripheral wall 111 and discharges the medicine from the outlet 112. An inner surface 111s of the peripheral wall 111 is cylindrical. The outlet 112 is formed on the bottom surface of the medicine containing section 110 and is adjacent to the inner surface 111s of the peripheral wall 111 on the radially inner side of the peripheral wall 111. The peripheral wall 111 is formed of a material with a low friction coefficient, for example, high-sliding polyethylene.

[0014] 3, a circular opening 113 is provided on the bottom surface of medicine containing section 110 at a position on the central axis of peripheral wall 111. A connecting shaft section 150 that connects rotor 120 to an output shaft of a motor (not shown) that rotates rotor 120 is inserted through opening 113.

[0015] As shown in FIG. 1, the cover 130 is provided rotatably so as to open and close the medicine containing section 110.

[0016] As shown in Figs. 1 to 5, the rotor 120 is rotatably disposed inside the peripheral wall 111. The rotor 120 is disposed on the bottom surface of the medicine containing section 110. In this embodiment, the rotor 120 is configured to be capable of both forward rotation, which rotates toward one side in the circumferential direction of the rotor 120 as indicated by an arrow A in Fig. 2, and reverse rotation, which rotates toward the other side in the circumferential direction of the rotor 120 as indicated by an arrow B in Fig. 2. The rotor 120 does not necessarily need to be capable of both forward and reverse rotation, and may be capable of rotating in at least one direction in the circumferential direction of the rotor 120.

[0017] Fig. 6 is a perspective view showing the appearance of the rotor of the medicine supplying device according to one embodiment of the present invention. Fig. 7 is a perspective view of the rotor of the medicine supplying device according to one embodiment of the present invention, seen from below. Fig. 8 is a bottom view of the rotor of the medicine supplying device according to one embodiment of the present invention. Fig. 9 is a side view showing the positional relationship between the rotor and a partition of the medicine supplying device according to one embodiment of the present invention. Fig. 9 illustrates a state in which a connecting shaft portion 150 is attached to the rotor 120.

[0018] As shown in Figures 2 and 4 to 9, rotor 120 has top surface portion 126 that is inclined convexly upward and peripheral surface portion 121 adjacent to top surface portion 126. Top surface portion 126 is provided with a plurality of radially extending grooves 127. A cylindrical portion 128 protrudes from the center of top surface portion 126. A cover 129 is detachably attached to the upper end of cylindrical portion 128.

[0019] 4 and 6 to 9, a plurality of first protrusions 122 are provided on the lower part of the peripheral surface portion 121, the first protrusions 122 being positioned with gaps 124 between them in the circumferential direction of the rotor 120. Each of the first protrusions 122 has a substantially rectangular outer shape when viewed from the radial direction of the rotor 120.

[0020] A first recess 122c extending toward the inside in the radial direction of the rotor 120 is formed on a tip end surface 122s located on the outside in the radial direction of the rotor 120 in each of the multiple first protrusions 122. That is, a first recess 122c is formed on an opposing surface (lower surface in this embodiment) facing the discharge port 112 in each of the multiple first protrusions 122, the first recess 122c crossing the opposing surface in the radial direction of the rotor 120. The first recess 122c is recessed in a direction opposite to the direction toward the discharge port 112 (upward in this embodiment) with respect to the opposing surface. An inner side surface 122w of the first recess 122c is formed so as to rise steeply from the opposing surface in a direction opposite to the direction toward the discharge port 112.

[0021] The angle formed between the bottom surface 122b of each of the multiple first protrusions 122 and the inner side surfaces 122w that face each other in the circumferential direction of the rotor 120 in the first recess 122c is 90° or less. In this embodiment, the first recess 122c has a substantially rectangular shape that is open downward when viewed from the radial direction of the rotor 120. That is, the angle formed between the bottom surface 122b of each of the multiple first protrusions 122 and the inner side surfaces 122w that face each other in the circumferential direction of the rotor 120 in the first recess 122c is substantially 90°.

[0022] The tip of each of the first protrusions 122 in the radial direction of the rotor 120 faces the inner surface 111s of the peripheral wall 111 with a small gap therebetween. When rotor 120 rotates, it is formed so that the medicine contained in gap 124 can be pressed and transported to outlet 112. Specifically, as rotor 120 rotates, the medicine contained in gap 124 is pressed by first protruding portion 122 and transported in the circumferential direction of rotor 120, and falls into outlet 112.

[0023] At least one second protrusion 123 is further provided on the peripheral surface portion 121. Specifically, the second protrusion 123 is disposed above at least one of the first protrusions 122. As shown in Figs. 2 and 5, in this embodiment, the second protrusions 123 are disposed on every other one of the first protrusions 122. A tip of each of the at least one second protrusion 123 faces the inner surface 111s of the peripheral wall 111 with a small gap therebetween.

[0024] 7 and 8, a second recess 121c that is continuous with the first recess 122c in the radial direction of the rotor 120 is formed in the peripheral surface portion 121. The second recess 121c penetrates the peripheral surface portion 121 in the radial direction of the rotor 120. The bottom surface portion 121b of the peripheral surface portion 121 is discontinuous in the circumferential direction of the rotor 120 due to the formation of the second recess 121c.

[0025] 9, a passage 125 through which the partition 140 passes when the rotor 120 rotates is provided between the first protruding portion 122 and the second protruding portion 123, which are positioned next to each other in the vertical direction. The width of the passage 125 in the vertical direction is slightly larger than the thickness of the partition 140. The second protruding portion 123 is formed so as to be movable from above the partition 140 by pressing the medicine located on the partition 140 when the rotor 120 rotates.

[0026] As shown in Figures 2, 4 to 7 and 9, the second protrusion 123 has, on one side in the circumferential direction of the rotor 120, a one-side upper surface 123b that is inclined downward as it goes in one direction in the circumferential direction of the rotor 120.

[0027] In this embodiment, the second protruding portion 123 further has, on the other side in the circumferential direction of the rotor 120, an other-side upper surface 123c that is inclined downward toward the other side in the circumferential direction of the rotor 120. Note that the second protruding portion 123 does not necessarily have to have the other-side upper surface 123c. In this case, the one-side upper surface 123b may extend over the entire upper surface of the second protruding portion 123.

[0028] The lower surface of the second protruding portion 123 is positioned horizontally. In this embodiment, the second protruding portion 123 has an outer shape of a triangle with a rounded apex when viewed from the radial direction of the rotor 120.

[0029] 9, in the second protruding portion 123, the upper surface 123a including the one-side upper surface 123b and the other-side upper surface 123c is inclined downward toward the radial tip side of the circumferential surface portion 121. In other words, the second protruding portion 123 has a tapered shape.

[0030] 2 and 5, the entire length of the second protruding portion 123 is shorter than the entire length of the first protruding portion 122 in the circumferential direction of the rotor 120. The entire length of the second protruding portion 123 is the length at the point where the second protruding portion 123 is longest in the circumferential direction of the rotor 120. In the present embodiment, the center position of the first protruding portion 122 and the center position of the second protruding portion 123 coincide in the circumferential direction of the rotor 120, but this is not limited thereto, and the center position of the second protruding portion 123 may be shifted from the center position of the first protruding portion 122.

[0031] As shown in FIGS. 2, 5 and 9, the partition 140 is disposed above the outlet 112. It extends from the inner surface 111s of the peripheral wall 111 toward the peripheral portion 121 so as to separate the first protruding portion 122 and the second protruding portion 123. The gap 124 communicating with the outlet 112 is covered by the partition portion 140, and the medicine is prevented from entering from above.

[0032] In this embodiment, the partition 140 is made of a flexible member. Specifically, as shown in Fig. 5 and Fig. 9, the partition 140 is made by joining a plurality of flexible members to an arc-shaped base material at intervals along the arc. The base material forms a part of the peripheral wall 111. The flexible members are made of, for example, soft synthetic resin. In this embodiment, the partition 140 is made in a brush shape, but is not limited to a brush shape and may be a plate shape.

[0033] The operation of the medicine supplying device 100 according to one embodiment of the present invention will be described below. When rotor 120 rotates with a medicine placed in medicine containing section 110, the medicine located on top surface section 126 moves toward the space between inner surface 111s of peripheral wall 111 and peripheral surface section 121 of rotor 120. The multiple grooves 127 agitate the medicine located on top surface section 126 as rotor 120 rotates, making it easier to move the medicine into the space.

[0034] Some of the medicines that have moved to the space are accommodated in the gaps 124, one at a time. As the rotor 120 rotates, the medicines accommodated in the gaps 124 are pressed by the first protruding parts 122 and transported in the circumferential direction of the rotor 120. The medicines accommodated in the gaps 124 that are located above the discharge port 112 and communicate with the discharge port 112 drop from within the gaps 124 into the discharge port 112 and are dispensed. At this time, the gaps 124 that communicate with the discharge port 112 are covered by the partition parts 140, preventing the medicines from entering from above.

[0035] Furthermore, the medicine located on the partition 140 is pressed by the second protruding portion 123 and moved from above the partition 140 as the rotor 120 rotates. The medicine moved from above the partition 140 is eventually accommodated in the gap 124 and transported to the outlet 112.

[0036] In this embodiment, the medicine is dispensed from the outlet 112 by rotating the rotor 120 in the forward direction. If the medicine is not dispensed from the outlet 112 for a certain period of time while the rotor 120 is rotating in the forward direction, the rotor 120 repeats reverse and forward rotation. If the medicine is dispensed while the rotor 120 is repeatedly rotating in the reverse direction and forward direction, the rotor 120 rotates in the forward direction again. If it is confirmed that the medicine is not dispensed even after the rotor 120 has repeatedly rotated in the reverse direction and forward direction multiple times, the rotor 120 stops.

[0037] Here, the clogging of the medicine in the medicine containing section 110 will be described. Fig. 10 is a plan view showing a state in which clogging of the medicine in the medicine containing section has occurred. As shown in Fig. 10, when the medicine 1 sandwiched between the peripheral wall 111 and the peripheral surface section 121 continues in the rotation direction of the rotor as shown by the arrow, causing clogging of the medicine 1, the rotor may stop.

[0038] In the drug supply device 100 according to one embodiment of the present invention, as shown in FIG. 2 and FIG. 4 to FIG. 9, the second protrusion 123 has a one-side upper surface 123b on one circumferential side of the rotor 120, which is inclined downward as it goes in one circumferential direction of the rotor 120.

[0039] Therefore, if the drug 1 is sandwiched between the portion of the peripheral surface portion 121 above the first protruding portion 122 and the inner surface 111s of the peripheral wall 111, the drug 1 sandwiched between the first protruding portion 122 and the inner surface 111s of the peripheral wall 111 can be pressed by the upper surface 123b on one side as the rotor 120 rotates in the normal direction. The drug 1 pressed against the upper surface 123b on one side is scooped up by the second protruding portion 123 and is then pushed against the peripheral wall 111, the peripheral surface portion 121, and the inner surface 111s of the peripheral wall 111. The state in which it is sandwiched between the

[0040] Since the medicine supplying device 100 has at least one second protruding portion 123, the medicine 1 sandwiched between the peripheral wall 111 and the peripheral surface portion 121 can be removed by at least one second protruding portion 123 every time the rotor 120 rotates once. This makes it possible to prevent the medicine 1 from clogging the medicine containing portion 110.

[0041] As described above, in the medicine supplying device 100 according to one embodiment of the present invention, it is possible to prevent the medicine container 110 from remaining in the medicine container 110 and to suppress clogging of the medicine container 110 with the medicine 1.

[0042] In the drug supply device 100 according to one embodiment of the present invention, the second protrusion 123 further has an other-side upper surface 123c on the other circumferential side of the rotor 120, which is inclined downward as it approaches the other circumferential side of the rotor 120.

[0043] Therefore, if the drug 1 is sandwiched between the portion of the peripheral surface portion 121 above the first protruding portion 122 and the inner surface 111s of the peripheral wall 111, the drug 1 that is sandwiched can be pressed by the other-side upper surface 123c as the rotor 120 rotates in the reverse direction. The drug 1 pressed against the other-side upper surface 123c is scooped up by the second protruding portion 123, and is released from the state of being sandwiched between the peripheral wall 111 and the peripheral surface portion 121. This makes it possible to prevent the drug 1 from clogging the drug containing portion 110 both when the rotor 120 rotates in the forward direction and when it rotates in the reverse direction.

[0044] Here, we will explain a situation in which, in a drug supply device according to a comparative example, a drug transported above the outlet 112 becomes stuck to the bottom surface of the first protrusion due to static electricity, and is then discharged from the outlet together with the next drug transported above the outlet 112.

[0045] Fig. 11 is a side view showing a state immediately before a medicine is transported above the outlet in the medicine supplying device according to the comparative example. As shown in Fig. 11, the medicine 1 is transported in the circumferential direction of the rotor by a first protruding part 922 having a rectangular parallelepiped shape. A bottom surface 922b of the first protruding part 922 is a flat surface.

[0046] 12 is a side view showing a state in which the medicine is being transported above the outlet 112 and is falling in the medicine supplying device according to the comparative example. As shown in FIG. 12, the medicine 1 transported above the outlet 112 by the first protruding part 922 falls toward the outlet 112.

[0047] Fig. 13 is a side view showing a state in which a falling medicine is stuck to the bottom surface of the first protrusion due to static electricity in the medicine supplying device according to the comparative example. As shown in Fig. 13, when the first protrusion 922 moving in the circumferential direction of the rotor approaches the medicine 1 falling toward the outlet 112, the medicine 1 may be stuck to the bottom surface 922b of the first protrusion 922 due to static electricity.

[0048] Fig. 14 is a side view showing a state in which the next medicine is transported above the outlet in the medicine supply device according to the comparative example, and two medicines are discharged from the outlet together. As shown in Fig. 14, the medicine 1 that was attached to the bottom surface 922b of the first protruding portion 922 and the medicine 1 that was next transported above the outlet 112 are discharged together. When two medicines 1 are discharged from the outlet 112 together in this way, it is detected as an error by the medicine detection sensor provided near the outlet 112. If this error detection occurs frequently, the medicine supply will be delayed and the efficiency will decrease.

[0049] Next, a description will be given of a drug discharge operation in the drug supply device 100 according to this embodiment. 15 is a side view showing a state in which the medicine is being transported above the outlet 112 and is falling in the medicine supplying device according to this embodiment. As shown in FIG. 15, the medicine 1 transported above the outlet 112 by the first protruding portion 122 falls toward the outlet 112.

[0050] Fig. 16 is a side view showing a state in which the first protrusion has moved above the falling medicine in the medicine supplying device according to this embodiment. As shown in Fig. 16, when the first protrusion 122, which has moved in the circumferential direction of the rotor, approaches the medicine 1 falling toward the outlet 112, the medicine 1 may become stuck to the bottom surface 122b of the first protrusion 122 due to static electricity.

[0051] Fig. 17 is a side view showing a state in which the medicine adhering to the bottom surface of the first protrusion falls in the medicine supplying device according to this embodiment. As shown in Fig. 17, since the area of ​​the bottom surface 122b of the first protrusion 122 is reduced by forming the first recess 122c in the first protrusion 122, the medicine 1 once adhering to the bottom surface 122b of the first protrusion 122 immediately leaves the bottom surface 122b of the first protrusion 122 and falls toward the outlet 112 before the next medicine 1 is transported above the outlet 112. This makes it possible to prevent two medicines from being discharged together.

[0052] In the drug supply device 100 according to one embodiment of the present invention, a first recess 122c extending toward the inside in the radial direction of the rotor 120 is formed on a tip surface 122s located on the outside in the radial direction of the rotor 120 in each of the multiple first protrusions 122. This makes it possible to prevent the drug 1 from sticking to the bottom surface 122b of the first protrusion 122 due to static electricity, and thus preventing two drugs 1 from being discharged together from the discharge port 112.

[0053] In the drug supply device 100 according to one embodiment of the present invention, a second recess 121c continuous with the first recess 122c in the radial direction of the rotor 120 is formed in the peripheral surface portion 121. The second recess 121c penetrates the peripheral surface portion 121 in the radial direction of the rotor 120. This makes it possible to prevent the drug 1 from sticking to the bottom surface portion 121b of the peripheral surface portion 121 due to static electricity, and thus preventing two drugs 1 from being discharged together from the discharge port 112.

[0054] In the drug supply device 100 according to one embodiment of the present invention, the angle formed between the bottom surface 122b of each of the multiple first protrusions 122 and the inner side surface 122w facing each other in the circumferential direction of the rotor 120 in the first recess 122c is 90° or less. This prevents the drug 1 statically attached to the bottom surface 122b of the first protrusion 122 from statically attaching to the inner side surface 122w, and allows the drug 1 to be reliably detached from the bottom surface 122b of the first protrusion 122 and discharged to the discharge port 112 before the next drug 1 is transported above the discharge port 112.

[0055] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be a basis for a restrictive interpretation. Therefore, the technical scope of the present invention is not interpreted solely by the above-described embodiments, but is defined based on the claims. Also, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0056] 1 medicine, 100 medicine supply device, 110 medicine storage section, 111 peripheral wall, 111s inner surface, 112 discharge port, 113 opening, 120 rotor, 121 peripheral surface, 121b bottom surface, 121c second recess, 122, 922 first protrusion, 122b, 922b bottom surface, 122c first recess, 122s tip surface, 122w inner surface, 123 second protrusion, 123a upper surface, 123b side upper surface, 123c other side upper surface, 124 gap, 125 passage, 126 top surface, 127 groove portion, 128 cylindrical portion, 129 cover, 130 lid portion, 14 0 partition part, 150 connecting shaft part.

Claims

1. A medicine storage section having an outlet and storing a medicine; a rotor that is disposed inside the medicine container and rotates relative to the medicine container to transport the medicine to the outlet, The rotor is provided with a plurality of protrusions positioned at intervals from one another in a circumferential direction of the rotor, Each of the plurality of protrusions is formed so as to be able to press the medicine contained in the gap and transport it to the outlet when the rotor rotates, a recessed portion extending radially inward of the rotor is formed on a surface of each of the plurality of protrusions facing the discharge port, The medicine supply device, wherein the recessed portion opens downward and extends in the circumferential direction when viewed from the radial direction.

2. The recess is recessed in a direction opposite to a direction toward the outlet with respect to the opposing surface, The medicine supply device according to claim 1 , wherein an inner surface of the recess is formed so as to rise steeply from the opposing surface in a direction opposite to a direction toward the discharge port.

3. A drug supply device as described in Claim 2, wherein the recess is approximately rectangular when viewed from the radial direction.

4. A drug supply device as described in claim 1, wherein only one recess is formed in each of the plurality of protrusions.

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