JP2005304404A - Chemical-radiating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical-radiating device capable of efficiently radiating a chemical such as an insect pheromone. <P>SOLUTION: The chemical stored in a chemical cartridge 4 is fed to a chemical nozzle 20 by a gear pump 13, and the droplet of the chemical dropped therefrom is introduced through a branching plate 24 and an outlet 25 to the outer periphery for radiating the chemical of a supporter 23 functioning as a chemical-radiating member in the chemical-radiating device 1. The chemical introduced to the outer periphery 27 for radiating the chemical droops down by deadweight on the outer periphery 27 and is simultaneously extended linearly in the circumferential direction along the valley of a helical groove 26 formed thereon. As a result, the chemical is spread over the outer periphery for radiating the chemical rapidly in a short time, and the chemical is radiated rapidly into air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drug diffusion device for releasing chemicals such as insect disruption agents and attractants made of insect pheromones, and more particularly to a drug diffusion device improved so that the drug can be efficiently released. is there.

  In farms, instead of using pesticides, pest control methods that reduce the occurrence of pests by releasing attractants such as insect pheromones in the air, causing disruption of communication by causing pests to disrupt communication and reducing the number of eggs laid. It has been known. For example, it is known that a large number of insect pheromone dispensers are installed at predetermined intervals in a farm facility to naturally dissipate insect pheromones. Insect pheromone dispensers are known in which sex pheromones are enclosed in plastic tubes, which are hung on the branches of growing plants or the framework of greenhouses, and the sex pheromones are naturally placed in the air through the tubes. It is made to dissipate (patent document 1). However, in this dispenser, insect pheromones are continuously released even during the day when insects do not mate, and the amount of radiation is higher during daytime when the temperature is high, so there is a lot of wasteful release of the drug. Further, sex pheromones having a double bond are liable to cause ultraviolet deterioration and oxidation, so that it is necessary to add a stabilizer, which increases the cost. Furthermore, when there are pests that are not expected due to the effects of nearby orchards, it is impossible to immediately respond to such unexpected pests.

Therefore, use of a drug diffusion device that forcibly releases a volatile drug by a heater or a fan (Patent Documents 2, 3, and 4), and a spray-type drug diffusion device by remote control (Patent Document) 5) Or, it is possible to disperse the medicine using a droplet discharge head similar to the ink jet head used in the ink jet printer (Patent Document 6).
JP-A-8-322447 Japanese Utility Model Publication No.58-110288 Utility Model Registration No. 30211119 JP-A-9-74969 US Pat. No. 6,182,904 US Pat. No. 6,339,897

  Here, such a forced or on-demand medicine diffusion device is generally attached to a support column set up in a field facility or the like, and a medicine such as an evaporating dish or a mesh-like material is used according to a required time zone. The drug is diffused to the outside by being dropped or discharged onto the surface of the radiation member. However, the amount of drugs such as insect pheromones that can be released is extremely small, and the diffusibility and developability are poor. For this reason, a very small amount of drug droplets dropped or discharged onto the surface of the evaporating dish or mesh-like material volatilizes and diffuses in the air in the state of being dropped or discharged on those surfaces. Since the contact area with air is small if it is in the form of dots, the radiation efficiency is extremely poor.

  In addition, when the wind is strong, the medicine dropped on the surface of the evaporating dish or mesh material may be blown off by the wind and fall to the ground. In this case, the medicine cannot be diffused over the entire spray area.

  In view of such a point, an object of the present invention is to propose a drug diffusion device capable of quickly expanding a discharged or dropped drug and efficiently diffusing the drug.

  A drug diffusion device according to the present invention includes a drug storage unit storing a volatile drug such as an insect pheromone, and a drug diffusion member including an outer peripheral surface for drug diffusion that releases the drug supplied from the drug storage unit to the outside. The outer peripheral surface for drug diffusion is provided with a spiral groove for expanding the drug along the outer peripheral surface for drug diffusion.

  Here, it is desirable that the spiral groove is formed so that the drug spreads along the spiral groove by its own weight and capillary force. For example, when the drug diffusing member is erected vertically and a spiral groove is formed on the outer peripheral surface for diffusing the drug, the drug spreads quickly from the upper side along the spiral groove by its own weight and capillary force in a short time.

  Moreover, it is desirable to perform a surface treatment for improving the wettability with respect to the drug on the outer peripheral surface for drug diffusion. For example, the outer peripheral surface for drug diffusion may be a rough surface by forming a textured metal deposition film or a metal vapor deposition film having a high surface roughness. Instead of this, or together with this, a plurality of fine grooves narrower than the spiral groove may be formed on the outer peripheral surface for drug diffusion in a state of intersecting the spiral groove.

  Next, in the medicine diffusion device of the present invention, in addition to each of the above-described configurations, a medicine spreading member that is relatively movable in the axial direction is disposed with respect to the medicine spreading member, and the medicine spreading member is provided with the above-described medicine spreading member. The structure which formed the internal thread part screwed together in a groove | channel can be employ | adopted. By relatively rotating the drug diffusing member and the drug spreading member, they can move relative to each other in the axial direction, and the drug can be forcibly spread uniformly along the outer peripheral surface of the drug diffusing member. .

  On the other hand, it is desirable to provide a cleaning mechanism for removing foreign substances such as dust adhering to the outer peripheral surface for drug diffusion.

  Further, as the drug diffusing member, at least two drug diffusing members that are concentrically disposed inside the drug spreading member and are relatively movable in the axial direction are disposed, and the outer side of the drug diffusing member on the inner side. The medicine diffusion member may be made to function as the medicine spreading member. As described above, when the same structure as the multistage screw jack is adopted, the outermost drug spreading member can forcibly spread the drug along the outer peripheral surface for drug diffusion of the outer drug spreading member. . At the same time, the outer drug-diffusing member can also forcibly spread the drug along the outer periphery of the inner drug-diffusing member. Further, according to this configuration, each drug diffusing member only has to be extended at the time of drug diffusion, so that the column does not interfere with farm work or the like as in the case where a long drug diffusion column is installed. The advantage is also obtained.

  In the drug diffusion device of the present invention, a spiral groove for spreading the drug along the outer peripheral surface is formed on the outer peripheral surface for drug diffusion of the drug diffusion member to which the drug is supplied. By appropriately setting the cross-sectional shape, depth, and the like of the spiral groove, the medicine can be rapidly expanded along the groove in a short time. Therefore, unlike the case where the medicine is diffused by an evaporating dish or a mesh-like material, the medicine can be efficiently diffused without causing adverse effects such as the medicine being blown into the wind in the form of droplets. Can be made.

  DESCRIPTION OF EMBODIMENTS Embodiments of a drug diffusion device to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view showing an example of a drug diffusion device for spraying insect pheromones to which the present invention is applied. The drug diffusion device 1 has a rectangular substrate 2 and a rectangular parallelepiped device cover 3 attached to the substrate 2. A mounting portion 5 for a medicine cartridge 4 (see FIGS. 2 to 4) filled with insect pheromone is formed inside the device cover 3, and an insertion port 5 a of the mounting portion 5 opens to the front surface of the device cover 3. ing. An openable / closable lid 6 is attached to the insertion slot 5a. A power switch 7 is arranged on the side of the insertion slot 5a, and a liquid crystal display unit 8, operation keys 9a to 9d, and LED lamps 10a to 10c for displaying an operation state are arranged on the side surface of the apparatus cover 3. .

  2 is a perspective view of the drug diffusing apparatus with the apparatus cover 3 removed when viewed from an oblique rear side, FIG. 3 is a plan view thereof, and FIG. 4 is cut along line IV-IV in FIG. It is a schematic sectional drawing which shows a part. The medicine cartridge 4 as a medicine storage part has a rectangular parallelepiped shape as a whole, and includes a plastic cartridge case 4a, a flexible medicine bag 4b accommodated therein, and a medicine supply port 4c. ing. The medicine supply port 4c penetrates the cartridge case 4a and communicates with the medicine bag 4b, and is normally in a sealed state.

  A medicine supply needle 11 is horizontally disposed in the mounting portion 5 to which the medicine cartridge 4 is attached. When the medicine cartridge 4 is attached to the attachment portion 5, the medicine supply needle 11 is inserted into the medicine supply port 4 c of the medicine cartridge 4. Is inserted, and the medicine filled in the medicine bag 4 b of the medicine cartridge 4 can be taken out via the medicine supply needle 11.

  The medicine taken out from the medicine supply needle 11 is supplied via a medicine supply pipe 12 to a gear pump 13 that functions as a medicine discharge means. The gear pump 13 includes a pump gear 14a fixed to the drive shaft. The pump gear 14a is connected to the drive motor 15 via a reduction gear 14b and a motor gear 15a. The rotation of the gear pump 13 is detected by a photo interrupter configured by a pump detection plate 16a meshing with the pump gear 14a and a photodetector 16b.

  An ink supply pipe 18 is connected to the discharge side of the gear pump 13, and the tip of the ink supply pipe 18 communicates with a medicine discharge nozzle 20 attached downward to the upper end of a cylinder 19 attached vertically to the substrate 2. . A lower end portion of the cylinder 19 penetrates the substrate 2, and a drug diffusing portion 22 is vertically attached to the lower end portion. When the gear pump 13 is driven, the medicine is sucked from the medicine cartridge 4 attached to the attachment portion 5 through the supply needle 11 and the medicine supply pipe 12, and the medicine is supplied to the medicine nozzle 20 through the medicine supply pipe 18. A drug droplet is discharged downward from the discharge nozzle 20.

  The drug diffusing unit 22 includes a support column 23 (medicine diffusing member) attached to the lower end of the cylinder 19 in a coaxial state. The upper half portion 231 of the column 23 is a hollow portion, the lower half portion 232 is a solid portion, and a conical surface whose lower end is pointed downward.

  The upper end portion of the hollow portion 23 a of the upper half portion 231 of the column is blocked by the flow dividing plate 24. The flow dividing plate 24 includes a conical surface 24 a that extends downward about the vertical center line 19 a of the cylinder 19. A plurality of outlets 25 are opened at equiangular intervals along the circumferential direction in a portion of the upper half portion 231 of the column facing the edge of the conical surface 24a. Therefore, the drug droplets discharged from the drug nozzle 20 flow down along the conical surface 24a of the flow dividing plate 24, and flow out from the outlet 25 to the outer peripheral surface side of the column 23.

  A circular outer peripheral surface portion of the upper half portion 231 of the column 23 is an outer peripheral surface 27 for drug diffusion in which a spiral groove 26 is formed. The spiral groove 26 has a substantially V-shaped cross section, and is formed with a certain lead toward the direction of the column axis (19a). The drug droplet flowing out from the outlet 25 is guided to the upper end side portion of the spiral groove 26. The drug droplet guided to the spiral groove 26 spreads along the valley of the spiral groove 26 along the spiral groove 26 by capillary force.

  FIG. 5 is an explanatory view showing a state in which a drug droplet spreads along the outer peripheral surface 27 for drug diffusion. As shown in FIG. 5A, the drug droplet 28 dropped from the drug nozzle 20 flows out to the upper end portion of the spiral groove 26 via the outflow port 25. The support columns 23 are arranged vertically, and the spiral grooves 26 are formed at a constant lead pitch in the axial direction (vertical direction). Accordingly, as shown in FIG. 5B and FIG. 5C, the drug droplet 28 is caused by its own weight to cross the crest and valley along the surface of each groove of the spiral groove 26 and to disperse the drug. The surface 27 is expanded downward. At the same time, in each groove of the spiral groove 26, it spreads along the valley portion in the circumferential direction of the outer peripheral surface 27 for drug diffusion by capillary force.

  In this way, the drug droplet 28 spreads in the circumferential direction while flowing down along the drug diffusion outer peripheral surface 27 by its own weight. Therefore, it spreads over the whole outer peripheral surface 27 for drug diffusion quickly in a short time. Therefore, the drug droplets are efficiently diffused into the air.

  Here, the groove width, depth, cross-sectional shape, lead pitch, and lead angle of the spiral groove 26 of the outer peripheral surface 27 for drug diffusion are determined in consideration of the viscosity of the drug, the wettability of the outer peripheral surface for drug diffusion with respect to the drug, etc. What is necessary is just to set so that a chemical | medical agent droplet can spread along the outer peripheral surface 27 for chemical | medical agent diffusion efficiently. As the spiral groove 26, a mountain-shaped screw groove 26a shown in FIG. 6A, a rectangular cross-sectional screw groove 26b shown in FIG. 6B, or the like can be used. Of course, other shapes such as a trapezoidal screw groove can also be used.

  Further, as shown in FIG. 7A, the wettability with respect to the drug is increased by applying a surface treatment such as roughening or rough deposition of a metal thin film such as alumina on the outer peripheral surface 27 for drug diffusion. It is desirable. In this way, the drug droplet 28 spreading on the line along each groove valley of the spiral groove 26 is applied to the groove side surfaces 26a and 26b having improved wettability as indicated by arrows in FIG. 7B. Along the surface along. As a result, as shown in FIG. 7 (c), a state in which the drug droplet 28 is rapidly spread over the entire outer peripheral surface 27 for drug diffusion can be formed, and the contact area with air is increased. It becomes possible to disperse the droplets in the air.

  Instead of performing such a surface treatment, as shown in FIGS. 8A and 8B, the outer peripheral surface 27 for drug diffusion is sufficiently larger than the spiral groove so as to intersect each groove of the spiral groove 26. A large number of fine grooves 34 extending in the direction of the pillar axis may be formed. Also in this case, the drug droplet that expands in a line along the valley of the spiral groove 26 expands in a line in the vertical direction along the narrow groove 34. Therefore, it is possible to quickly spread the drug droplets on the entire outer peripheral surface 27 for drug diffusion.

(Another example of the drug diffusion part)
In the medicine diffusing section 22, the medicine droplet is spread by capillary force and its own weight along the medicine diffusing outer peripheral surface 27 of the column 23 which is the medicine diffusing member. When rapid natural expansion cannot be expected only by the capillary force and its own weight, it is desirable to forcibly expand the drug droplet along the outer peripheral surface for drug diffusion.

  FIGS. 9A and 9B show a configuration example of a drug diffusing portion including a drug spreading member for forcibly spreading a drug droplet along the outer periphery for drug diffusion. The drug diffusion part 22A shown in these figures has a cylindrical column 23A which is a drug diffusion member, and the circular outer peripheral surface of the column 23A is for drug diffusion in which a spiral groove 26A is formed at a constant lead pitch. The outer peripheral surface is 27A. A nut 35 that functions as a drug diffusing member having a female screw threadedly engaged with the spiral groove 26A formed on the inner peripheral surface is attached to the support column 23A. The nut 35 is supported in a state in which rotation and movement in the column axis direction are prevented. A funnel-shaped drug droplet receiving surface 35a is formed on the upper end surface of the nut 35, and the drug droplet dropped from the drug discharge nozzle 20A located directly above the drug droplet receiving surface 35a. To be accepted.

  The column 23A is rotated around its axis by the drive mechanism 36. The drive mechanism 36 includes a drive motor 37, a drive gear 38 that is coaxially attached to the motor output shaft, and a driven gear 39 that is coaxially attached to the column 23A. The driven gear 39 includes an internal thread that is screwed into the spiral groove 26A of the support 23A, and is freely rotatable, but is supported so as not to move in the axial direction of the support 23A.

  The column 23A is held at the height position shown in FIG. 9A in the standby state. At the time of drug diffusion, a drug droplet is dropped from the drug nozzle 20A onto the nut 35 and collected on the drug droplet receiving surface 35a. For example, the drive mechanism 36 is driven simultaneously with the dropping of the medicine, and the support 23A is rotated around the axis. As a result, the support 23A rises along its axial direction (performs a linear motion). The outer peripheral surface 27A for releasing the medicine of the support 23A rises while being supplied with the medicine droplets accumulated therein while passing through the nut 35. When the support column 23A is raised to the ascending position shown in FIG. 9B, the drug droplet is spread over substantially the entire outer peripheral surface 27A for drug diffusion. As a result, the drug quickly diffuses in the air from the outer peripheral surface 27A for drug diffusion.

  When the column 23A is rotated in the reverse direction by the drive mechanism 36, the column 23A is lowered again to the standby position shown in FIG. In this state, it waits until the next drug release time.

  In this way, by using the nut 35 to forcibly spread the drug droplets onto the outer peripheral surface 27A for releasing the drug, the outer peripheral surface for releasing the drug such as an insect pheromone that is difficult to evaporate and naturally spreads. Can be expanded quickly.

  Here, in the medicine diffusion portion 22A of this example, a cleaning mechanism 45 for cleaning the medicine dispersion outer peripheral surface 27A contaminated with agricultural chemicals or dust is disposed above the nut 35. FIGS. 10A and 10B are a plan view and a front view showing the cleaning mechanism 45 in the cleaning state, and FIGS. 10C and 10D are a plan view and a front view showing the cleaning mechanism 45 in the standby state. The cleaning mechanism 45 is inserted into a groove of a porous member 46 such as a felt whose surface can be in contact with a circular outer peripheral surface portion between grooves on the outer peripheral surface 27A for drug diffusion, and a spiral groove 26A of the outer peripheral surface 27A for drug diffusion. A blade 47 having a possible tip portion, and a movement for moving the porous member 46 and the blade 47 to a cleaning position 45A in contact with the outer peripheral surface 27A for drug diffusion and a retreat position 45B retracted from the cleaning position 45A. And a mechanism 49.

  The moving mechanism 49 includes a motor 51 that is vertically attached to the mounting plate 60 in an upward posture, and the pinion 52 fixed to the output shaft 51 a of the motor 51 includes a sun gear 531, a planetary gear 532, and an arm 533. The planetary gear mechanism 53 is connected. The porous member 46 and the blade 47 are attached to the arm 533, and a section from the first stopper 55 to the second stopper 56, that is, from the cleaning position 45 </ b> A in contact with the first stopper 55 to the second stopper 56. It is possible to move between the retracted position 45B in contact with.

  In the cleaning mechanism 45 configured as described above, the porous member 46 and the blade 47 are moved while the drug 43 applied to the outer peripheral surface 27A for drug diffusion is diffused into the atmosphere by moving the support column 23A upward. It is waiting at the retreat position 45B shown in FIG. After the drug 43 is diffused after a predetermined time has passed, the support 23A is moved downward and stored. At this time, the porous member 46 and the blade 47 move to the cleaning position 45A shown in FIG. As a result, the agrochemicals and the like adhering to the surface of the outer peripheral surface 27A for drug diffusion are wiped off by the porous member 46, and the dust and the like adhering in the groove are scraped off by the blade tip of the blade 47.

  In the above example, the drug 43 is applied to the outer peripheral surface 27C for releasing the drug by moving the column 23A in the axial direction while rotating the column 23A. On the contrary, the nut 35 is moved up and down. The drug may be applied to the outer peripheral surface for drug diffusion.

  Further, the lead pitch and lead angle of the spiral groove 26A are determined so that the nut 35 can move downward (in the direction of the pillar axis) while rotating by its own weight along the spiral groove 26A of the support 23A. 35 may be lowered. In this case, it is necessary to attach a nut lifting mechanism or the like for raising the nut 35.

(Example of telescopic drug diffusion part)
FIGS. 11A to 11C are explanatory views showing an example of an extendable medicine diffusion unit. The drug diffusing portion 22B of this example includes an outer cylinder 35A, and a cylindrical outer support column 23B and a cylindrical inner support column 23C which are arranged concentrically on the inner side. The outer support column 23B includes an outer peripheral surface 27B for drug diffusion including a spiral groove 26B, and the inner support column 23C also includes an outer peripheral surface 27C for drug diffusion including a spiral groove 26C. The outer cylinder 35A and the outer column 23B are screwed together, and the outer column 23B and the inner column 23C are also screwed. The outer cylinder 35A is supported in a state in which it cannot be rotated and moved up and down. When the outer support column 23B and the inner support column 23C are rotationally driven around the axis by the rotation drive mechanism 60, the outer support column 23B first expands and the outer support column 23B After reaching the rising end, the inner support column 23C starts to extend and moves to the upper end position. When the rotary drive mechanism 60 is driven in reverse rotation, the extended inner column 23C is drawn into the outer column 23B, and then the outer column 23B is drawn into the outer cylinder 35A. Such an operation is the same as that of the multistage screw jack mechanism.

  The medicine discharge nozzle 20B is disposed directly above the outer cylinder 35A, the outer support pillar 23B, and the inner support pillar 23C, and from here, the medicine 28 is dropped onto these upper end surfaces 61 (FIG. 11). (See (a)). The outer peripheral surfaces 27B and 27C for drug diffusion of the outer column 23B and the inner column 23C are configured in the same manner as in FIGS. Therefore, the medicine 28 dripped onto the upper end surface 61 spreads along the medicine diffusion outer peripheral surface 27B of the outer column 23B and the drug diffusion outer peripheral surface 27C of the inner column 23C (see FIG. 11B). Thereafter, the rotation drive mechanism 60 is driven to extend the outer support column 23B and the inner support column 23C. As a result, as shown in FIG. 11 (c), the outer peripheral surfaces 27B and 27C for drug diffusion in the columns 23B and 23C are exposed. When the outer column 23B extends, the drug is applied to the outer periphery 27B for drug diffusion by screwing with the outer cylinder 35A, and when the inner column 23C extends, the drug is dissipated by screwing with the outer column 23B. The medicine is applied to the outer peripheral surface 27C. Therefore, a state in which the medicine is uniformly spread is formed on both outer peripheral surfaces 27B and 27C for releasing medicine, and the medicine is efficiently diffused in the air from these outer peripheral faces.

  The outer struts 23B and the inner struts 23C of the drug diffusing portion 22B of this example are telescopic, so they only need to be extended upward when the drug is diffused and stored in other time zones. Therefore, unlike the case where a long support is installed, there is no problem that the support interferes with farm work.

  In addition, although this example is a two-stage structure including the outer support column 23B and the inner support column 23E, it is needless to say that a multi-stage support structure having one or more stages may be adopted.

It is an external appearance perspective view of the chemical | medical agent diffusion apparatus to which this invention is applied. It is a perspective view which shows the chemical | medical agent diffusion apparatus of FIG. 1 in the state which removed the apparatus cover. It is a top view of the chemical | medical agent diffusion apparatus of the state of FIG. It is a schematic sectional drawing of the part cut | disconnected by the IV-IV line of FIG. It is explanatory drawing which shows the outer peripheral surface for chemical | medical agent dissipation of a support | pillar. It is explanatory drawing which shows another example of the spiral groove which can be formed in the outer peripheral surface for chemical | medical agent diffusion of a support | pillar. It is explanatory drawing which shows the example which provided the wettability to the outer peripheral surface for chemical | medical agent dispersion of a support | pillar. It is explanatory drawing which shows the example which provided the wettability to the outer peripheral surface for chemical | medical agent dispersion of a support | pillar. It is a schematic sectional drawing which shows another example of a chemical | medical agent diffusion part. It is explanatory drawing which shows the cleaning mechanism of FIG. It is explanatory drawing which shows an expansion-contraction type medicine diffusion part.

Explanation of symbols

1 medicine diffusion device, 4 medicine cartridge, 20, 20A, 20B medicine discharge nozzle,
22, 22A, 22B Drug diffusion part, 23, 23A, 23B, 23C Strut, 26, 26a, 26b, 26B, 26C Spiral groove, 27, 27A, 27B, 27C Peripheral surface for drug diffusion, 34 narrow groove, 35 nut, 35A outer cylinder, 45 cleaning mechanism, 46 porous member, 47 blade, 49 moving mechanism

Claims (8)

A drug reservoir that stores volatile drugs such as insect pheromones;
A drug-dissipating member having an outer peripheral surface for drug diffusion that diffuses the drug supplied from the drug reservoir to the outside;
The medicine diffusion device, wherein the medicine diffusion outer peripheral surface includes a spiral groove for spreading the medicine along the medicine diffusion outer peripheral surface. In claim 1,
A drug diffusion device in which the spiral groove is formed so that the drug spreads along the spiral groove by its own weight and capillary force. In claim 1 or 2,
A drug diffusion device in which a surface treatment for increasing wettability with respect to the drug is applied to the outer peripheral surface for drug diffusion. In claim 3,
A drug diffusion device in which a rough surface processing is performed on the outer peripheral surface for drug diffusion. In claim 3,
The drug diffusing apparatus, wherein a plurality of fine grooves that are narrower than the spiral groove are formed on the outer periphery of the drug divergence so as to intersect the spiral groove. In any one of claims 1 to 5,
It has a drug spreading member that can move relative to the drug diffusing member in its axial direction,
The drug spreading device, wherein the drug spreading member includes a female screw portion screwed into the spiral groove. In any one of claims 1 to 6,
A drug diffusion apparatus having a cleaning mechanism for cleaning the outer peripheral surface for drug diffusion. In claim 6 or 7,
The drug diffusing member is disposed concentrically inside the drug spreading member, and includes at least two drug diffusing members that are relatively movable in the axial direction.
The drug diffusion device in which the outer drug diffusion member functions as the drug spreading member with respect to the inner drug diffusion member.

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