JPH09182792A - Medicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a specified dose of powder drug to a patient by controlling the flowing-back of air through an air flow path and thereby preventing the powder drug from stocking to a supply valve. SOLUTION: Each of paths 16 for controlling the flowing-back of air is provided between a pump-side passageway 15 and a powder drug receiving chamber 7, and is formed into a low resistant circular passage part on the pump-side passageway 15 side and a high-resistant cross passage part consisting of four notched paths on the powder drug receiving chamber 7 side. Consequently, the air supplied from a pump part 19 can be smoothly circulated from the low resistant circular passage part to the high resistant cross passage part, so that the air flow is positively supplied into a capsule from a pin inserting hole 9. On the other hand, if the air happens to flow back toward the pump-side passageway 15 side, the air is prevented from being permeated into each of the paths 16 for controlling the flowing-back of the air. Thus it is possible to intercept the flowing-back of the air to the pump-side passageway 15 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug dispenser suitable for use in administering a powdered medicine (medicine powder) contained in a medicine container to a patient.

[0002]

2. Description of the Related Art In general, a method of treating a patient suffering from nasal allergy or asthma by administering a powdery medicine through a nasal cavity or an oral cavity is adopted. Further, in this treatment method, a powdery medicine filled in a capsule or the like is administered to a nasal cavity or an oral cavity using a special sprayer.

Further, the nebulizer used in this treatment method is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-66382 (hereinafter referred to as "prior art") for administering a drug into the nasal cavity of a patient.
The following are known.

In this conventional sprayer, a pump chamber is provided on the inlet side of the ventilation chamber, a powder storage chamber for storing capsules is provided on the outlet side of the ventilation chamber, and a front end side of the powder storage chamber is provided on the front end side of the powder storage chamber. Has formed an ejection hole serving as a chemical spray port. Further, a cap is detachably fitted to the powder storage chamber, and a long needle extending in the axial direction is provided in the cap, and the long needle is provided at a front end side of the powder storage chamber. When the cap is attached, a vent hole is formed in the capsule stored in the powder storage chamber. further,
A movable valve that allows a pressurized airflow from the pump chamber to the powder storage chamber to pass therethrough and blocks the flow in the opposite direction is provided in the communication passage in the ventilation chamber.

In the prior art configured as described above,
First, in the case of making a hole in a capsule which is a preparation operation for dosing, after storing a capsule filled with a powdery medicine in a powder storage chamber, a long needle is inserted into an ejection hole of the powder storage chamber. By attaching the cap from the front end side in this manner, the long needle pierces the ventilation hole penetrating in the axial direction of the capsule.

Next, at the time of administration of the medicine, the cap is removed from the powder storage chamber, the front end of the powder storage chamber is inserted into one nasal cavity of the patient, and the pump chamber is pressed, whereby the pump chamber is pressed. The air in the capsule is circulated through the communication path of the ventilation chamber into the capsule, and the medicine in the capsule is sprayed into the nasal cavity of the patient from the ejection hole by the air. The patient alternately inserts the front end of the powder storage chamber into the nasal cavity and repeats the pressing operation of the pump chamber to administer the medicine into the left and right nasal cavities.

On the other hand, at the time of this medication, when the pump chamber is restored (when the outside air is sucked into the pump chamber), air flows from the ejection holes of the powder storage chamber and tries to flow back together with the chemicals into the pump chamber. The valve prevents chemicals from entering the pump chamber.

[0008]

By the way, in the above-mentioned conventional atomizer, a movable valve for preventing a flow in the opposite direction is made to pass through the communication passage in the ventilation chamber from the pump chamber toward the powder storage chamber. By providing the valve, the movable valve is closed when the pump chamber returns to prevent the chemical from flowing back into the pump chamber.

However, since it takes a little time for the movable valve to close from the open state, the chemical gradually flows backward and adheres to the movable valve until the valve is closed. Chemicals accumulate on the movable valve, resulting in poor closing of the movable valve, causing chemicals to flow into the pump chamber.
As a result, since a part of the medicine filled in the capsule flows into the pump chamber, it becomes impossible to administer a prescribed amount of the medicine to the patient, and there is a problem that the efficacy of the medicine decreases.

The present invention has been made in view of the above-mentioned problems of the prior art, and suppresses the backward flow of air in the air flow passage to prevent the adherence of the drug powder to the supply valve, so that the specified amount of the drug is supplied. It is an object of the present invention to provide a drug dispenser that allows powder to be administered to a patient.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems, a drug dispenser adopted by the invention of claim 1 is a drug dispenser main body having a drug powder containing chamber for containing drug powder, and the drug dispenser. A pump unit that communicates with the main body and discharges air through a supply valve, an air flow passage formed in the drug dispenser body from the pump unit toward the drug powder storage chamber, and communicates with the drug dispenser body,
A chemical powder spraying unit for spraying chemical powder in the chemical powder storage chamber by air supplied through the air flow passage, and a chemical powder spraying unit provided in the middle of the air flow passage to the supply valve side from the chemical powder spraying unit. And an air backflow suppressing unit that suppresses the backflow of air.

With this configuration, when the supply valve is opened from the pump section and air is discharged, the air flows into the drug powder storage chamber through the air flow passage and the air backflow suppressing section, and the medicine is stored. The powder is sprayed from the powder spray unit together with the powder in the powder storage chamber. On the other hand, when the outside air is sucked into the pump unit, air tries to flow backward through the drug powder spray unit, the drug powder storage chamber, and the air flow passage by the time the supply valve is closed. Since the backflow of air is suppressed by the air backflow suppression unit, it is possible to prevent the backflow of the chemical powder toward the supply valve.

According to the second aspect of the present invention, the air backflow suppressing portion is configured to change the air flow resistance such that the pump portion side has a low resistance and the chemical powder containing chamber side has a high resistance.

With this configuration, the air supplied from the pump section via the air flow passage flows through the air backflow suppressing section from the low resistance pump section side to the high resistance drug powder storage chamber side. , Is smoothly circulated in the air backflow suppressing portion and is supplied to the drug powder storage chamber. On the other hand, when the outside air is sucked in to return the pump unit, the chemical powder storage chamber side of the air backflow suppressing unit has a high resistance, so that the backflow of air into the air backflow suppressing unit can be suppressed and It is possible to prevent the backflow of the drug powder to the valve side.

According to a third aspect of the present invention, the air backflow suppressing portion is configured by forming a circular hole on the pump portion side and a non-circular hole on the chemical powder containing chamber side.

With this configuration, the air supplied from the pump unit through the air flow passage flows through the air backflow suppressing unit from the low resistance circular hole to the high resistance non-circular hole. The drug is smoothly distributed in the backflow suppressing portion and is supplied to the drug powder storage chamber. On the other hand, when the outside air is sucked in to return the pump unit, since the chemical powder containing chamber side of the air backflow suppressing unit has a non-circular hole with high resistance, the backflow of air into the air backflow suppressing unit is prevented. It can be suppressed and the backflow of the chemical powder to the supply valve side can be prevented.

According to the fourth aspect of the invention, the air backflow suppressing portion is constituted by forming a single hole on the pump portion side and a perforated hole on the chemical powder containing chamber side.

With this structure, the air supplied from the pump portion through the air flow passage flows from the low resistance single hole to the high resistance porous hole in the air backflow suppressing portion. The drug is smoothly distributed in the backflow suppressing portion and is supplied to the drug powder storage chamber. On the other hand, when the outside air is sucked in to return the pump unit, since the chemical powder containing chamber side of the air backflow suppression unit has a high resistance porous hole, the backflow of air into the air backflow suppression unit is suppressed. It is possible to prevent the backflow of the drug powder to the supply valve side.

According to a fifth aspect of the present invention, the air backflow suppressing portion is configured by increasing the passage cross-sectional area on the pump portion side and decreasing the passage cross-sectional area on the chemical powder storage chamber side.

With this configuration, the air supplied from the pump unit via the air flow passage is supplied to the air backflow suppressing unit from the side with a large passage cross-sectional area and low resistance to the side with a small passage cross-sectional area and high resistance. Therefore, it is smoothly circulated in the air backflow suppressing portion and is supplied to the drug powder storage chamber. On the other hand, when the outside air is sucked in to return the pump unit, the backflow of air into the air backflow suppressing unit has a small cross-sectional area and high resistance on the side of the chemical powder containing chamber of the air backflow suppressing unit. And the backflow of the chemical powder to the supply valve side can be prevented.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A nasal drug dispenser as a drug dispenser according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First, FIGS. 1 to 5 show a first embodiment of the present invention.

1 is a capsule holder which constitutes the main body of the drug dispenser, 2
Shows a fixed member that constitutes the capsule holder 1 together with a movable member 8 which will be described later, and the fixed member 2 is formed in a double cylinder shape from an outer cylinder portion 3 and an inner cylinder portion 6 which will be described later as shown in FIG. The pump-side passage 1 is provided between the outer tubular portion 3 and the inner tubular portion 6.
5 are formed.

Reference numeral 3 denotes an outer cylindrical portion formed in a stepped bottomed cylindrical shape which opens upward so as to form an outer shell of the fixing member, and the outer cylindrical portion 3 has a large diameter cylindrical portion 3A. A small-diameter tubular portion 3C extending downward from a bottom portion 3B of the large-diameter tubular portion 3A, a closed bottom portion 3D that closes the lower end of the small-diameter tubular portion 3C, and an opening side of the large-diameter tubular portion 3A. Formed flange part 3E
It is roughly composed of Further, the closed bottom portion 3D has an air supply passage 4 that opens into a pump portion 19 described later.
Is formed, and an engagement groove 5 with which a later-described locking pin 10 is engaged is formed on the inner peripheral surface of the large-diameter cylindrical portion 3A so as to extend in the axial direction.

Reference numeral 6 denotes an inner cylinder portion provided inside the outer cylinder portion 3, and the inner cylinder portion 6 includes a cylinder portion 6A and a bottom portion 6B of the cylinder portion 6A.
From the valve opening amount restricting portion 6C extending downward from the opening portion of the tubular portion 6A, and the flange portion 6D having an enlarged diameter from the opening side of the tubular portion 6A. The inner tubular portion 6 is provided with the outer tubular portion via the flange portion 6D. Large diameter cylinder part 3
It is connected to the inner circumference of A. In addition, the valve opening amount regulation unit 6C
Defines a valve opening lift amount of the supply valve 13 by bringing the supply valve 13 described later into contact with the lower end surface thereof.
Further, a drug powder receiving chamber 7 is formed in the cylindrical portion 6A so as to extend toward the bottom portion 6B.

Here, the chemical powder receiving chamber 7 constitutes a storage chamber side passage together with a pin insertion hole 9 which will be described later. The drug powder receiving chamber 7 receives the drug powder falling from the air inflow hole H1 formed in the capsule K by the first drilling pin 27 described later, and the drug powder enters the supply valve 13 side. Is being prevented.

Reference numeral 8 denotes a movable member which is provided on the fixed member 2 so as to be movable in the axial direction. The movable member 8 is provided on the tubular portion 8A and the lower end side of the tubular portion 8A, and is provided on the outer tubular portion 3. Large diameter cylinder 3A
A large-diameter bottom portion 8B which is movably held in the axial direction,
The small-diameter projection is composed of a small-diameter projection 8C extending from the center of the bottom part 8B into the cylindrical part 6A of the inner cylindrical part 6, and a male screw 8D engraved on the outer peripheral surface of the cylindrical part 8A over the entire circumference. 8C has a pin insertion hole 9 formed therein.

Here, the pin insertion hole 9 is formed by penetrating the small-diameter projection 8C through the bottom 8B in the axial direction.
The hole-drilling pin 27 is inserted. Further, the pin insertion hole 9 is provided in the capsule storage chamber 1 together with the powder receiving chamber 7.
The storage chamber-side passage communicating with the No. 2 is configured. Further, a detent pin 10 is formed on the outer peripheral side of the cylindrical portion 8A so as to project outward in the radial direction, and the detent pin 10 engages with the engagement groove 5 of the fixing member 2 so that the fixing member 2 On the other hand, the rotation of the movable member 8 with respect to the fixed member 2 is restricted while allowing the movable member 8 to move in the axial direction.

On the other hand, the inner peripheral side of the cylindrical portion 8A of the movable member 8 has a diameter slightly larger than that of a capsule K (shown in FIG. 5) filled with powdery chemicals (hereinafter referred to as medicinal powder). The capsule hole 11 is formed, and the one side capsule hole 11 is integrated with the other side capsule hole 24, which will be described later, to form a capsule containing chamber 12 which is a drug powder containing chamber.

As described above, in the capsule holder 1 according to this embodiment, the movable member 8 can be moved in the axial direction along the outer cylindrical portion 3 of the fixed member 2, and the male screw 8D of the movable member 8 will be described later. Since the rotation of the movable member 8 with respect to the fixed member 2 is restricted by the detent pin 10 when the female member 23A is screwed, the movable member 8 is automatically pulled up to the passage member 21 side.

Reference numeral 13 denotes a supply valve provided in the small-diameter cylindrical portion 3C of the outer cylindrical portion 3, and the supply valve 13 opens and closes the air supply passage 4 formed in the fixed member 2, and is provided from the pump portion 19 When air is supplied, the valve is opened, and when sucking air into the pump portion 19, it is seated to close the air supply passage 4.

Reference numeral 14 denotes an air flow passage provided across the fixed member 2 and the movable member 8. The air flow passage 14 is formed between the outer cylinder portion 3 and the inner cylinder portion 6 and is located upstream (lower side). Side) can communicate with the air supply passage 4 via the supply valve 13, and the downstream side (upper side) extends to the collar portion 6D of the inner tubular portion 6 and has a stepped tubular pump side passage 15 and a capsule housing chamber. The chemical powder receiving chamber 7 and the pin insertion hole 9 which form a storage chamber side passage communicating with 12 are communicated with the pump side passage 15 and the chemical powder receiving chamber 7 by respective air backflow suppressing passages 16 described later. There is.

.. indicate a plurality of air backflow suppressing passages (only two are shown) provided in the inner cylinder portion 6, and each of the air backflow suppressing passages 16 is a cylinder portion 6A of the inner cylinder portion 6. Is formed so as to pass through in the radial direction, thereby connecting the pump side passage 15 and the chemical powder receiving chamber 7 forming the storage chamber side passage. Here, as shown in FIG. 3, each air backflow suppression passage 16 becomes a circular passage portion 17 having a circular cross section with a circular hole on the pump side passage 15 side in a state where the cross sectional area is constant, and the chemical powder receiving chamber 7 side is The cross passage portion 18 has a cross-shaped cross section that is a non-circular hole (see FIG. 4). Here, the cross passage portion 18 is composed of notched passages 18A, 18A, ... As a result, inside the circular passage portion 17, the surface area of the inner wall 17A is small and the air flow resistance is small, while inside the cross passage portion 18, each notch is formed as compared with the inner wall 17A of the circular passage portion 17. The inner wall 18 corresponding to the passage 18A
Since the surface area of B is significantly large, the air flow resistance is large.

Each of the air backflow suppressing passages 16 has a low resistance circular passage portion 17 on the pump side passage 15 side and a high resistance cross passage portion 18 on the chemical powder receiving chamber 7 side. Air supplied from 19 through the pump-side passage 15 is smoothly circulated from the low-resistance circular passage portion 17 to the high-resistance cross passage portion 18, and is made to flow to the powder receiving chamber 7 side. On the other hand, when the air is about to backflow from the chemical powder receiving chamber 7 toward the pump side passage 15 side, such as when sucking the outside air into the pump portion 19, the inside of the air backflow suppressing passage 16 is provided by the high resistance cross passage portion 18. Suppresses the invasion of air into the
The backflow of the air containing the chemical powder to the pump side passage 15 side is prevented.

Reference numeral 19 denotes a pump portion formed of a rubber material in a cylindrical shape having a bottom. The pump portion 19 has a thick opening 19A, a bottom 19B and the openings 19A and 19B.
The opening 19A is airtightly mounted on the large-diameter cylindrical portion 3A of the outer cylindrical portion 3. Further, most of the capsule holder 1 is housed in the pump portion 19, whereby the nasal drug dispenser is axially downsized.

Reference numeral 20 denotes a suction valve provided at the bottom portion 19B of the pump portion 19. The suction valve 20 is located in the central portion and communicates with the inside of the pump portion 19, and the suction passage 20A is opened and closed. The valve body 20B is configured to be closed when the pressing portion 19C is pressed to supply air from the pump portion 19, while the valve body 20B is closed.
Is opened by the elastic force, that is, when the outside air is sucked into the pump portion 19, the valve is opened.

Reference numeral 21 denotes a passage member provided in the movable member 8 of the capsule holder 1. On the upper portion of the passage member 21, left and right spray nozzles 22, 22 are formed to project.
A movable member screw hole 23 is formed in the lower portion of the passage member 21, and a female screw 23A screwed to the male screw 8D of the movable member 8 is formed on the inner periphery of the opening side of the movable member screw hole 23. ing. Further, in the inner part of the movable member screwing hole 23, the other side capsule hole 24 that constitutes the capsule housing chamber 12 together with the one side capsule hole 11 is formed.

Reference numerals 25 and 25 denote left and right drug powder passages which are formed in the passage member 21 and form a drug spray portion. Each drug powder passage 25 communicates with the other side capsule hole 24 at its proximal end side. The tip end side is formed in a substantially U shape branching to the left and right, and the tip end thereof serves as separate spray ports 26, 26 in each spray nozzle 22.

Reference numeral 27 denotes a first drilling pin provided in the fixing member 2. The first drilling pin 27 has its base end side fixed to the valve opening amount restricting portion 6C of the inner cylindrical portion 6 and its tip end side inserted with a pin. It projects from the bottom of the capsule accommodating chamber 12 through the hole 9 toward the opening, and its tip is sharply formed.

The tip of the first piercing pin 27 projects from the bottom of the capsule accommodating chamber 12 when the movable member 8 is located on the pump portion 19 side. An air inflow hole H1 can be formed in the capsule K by inserting and pushing the capsule K into the capsule accommodating chamber 12.

On the other hand, when the movable member 8 is located on the passage member 21 side, the tip is retracted into the pin insertion hole 9, so that the tip is pulled out from the air inflow hole H1. Further, at this time, the first hole-piercing pin 27 is located in the pin-inserting hole 9, and the flow path area of the pin-inserting hole 9 is narrowed by the first hole-piercing pin 27. The flow velocity of the air from the pump unit 19 can be increased by this, and the capsule K can be accelerated by this increased air velocity.
The medicinal powder inside can be effectively stirred.

Reference numeral 28 is a second drilling pin provided in the passage member 21 so as to face the first drilling pin 27, and the base end side of the second drilling pin 28 is provided so as to be slidable in the axial direction. It is fixed to the sliding block 29, and the tip side extends so as to penetrate the seal rubber 30, and the tip is sharply formed. Then, the second drilling pin 28 is
By operating an operation plate (not shown) provided outside the passage member 21 to operate the hole-drilling pin 28, an air outflow hole H2 is formed in the capsule K by its tip.

The drug delivery device for nasal cavity according to the present embodiment has the above-mentioned structure. Next, the operation of using the drug delivery device will be described.

First, the movable member 8 of the capsule holder 1 is positioned on the pump portion 19 side so that the tip of the first piercing pin 27 is projected to the bottom of the capsule accommodating chamber 12. After inserting the capsule K into the capsule housing chamber 12 in this state, the capsule K is pushed into the one-side capsule hole 11 with a fingertip or the like. As a result, the tip of the first piercing pin 27 pierces the capsule K, and the air inflow hole H1 is formed in the capsule K.

Next, in order to assemble the passage member 21 to the capsule holder 1, the female screw 23A on the passage member 21 side is screwed to the male screw 8D on the capsule holder 1 side. This allows
Since the movable member 8 of the capsule holder 1 is moved to the passage member 21 side by screwing the passage member 21, the capsule K is held in the capsule accommodating chamber 12 while being slightly pressed in the axial direction. Further, at this time, the tip of the first piercing pin 27 in which the air inflow hole H1 is formed in the capsule K is pulled out from the capsule K, and the air inflow hole H1, the pin insertion hole 9 and each air backflow suppressing passage are inside the capsule K. It communicates with the pump side passage 15 via 16.

Also, from the capsule K to the first piercing pin 2
By removing 7, the drug powder in the capsule K drops from the air inflow hole H1 into the inner cylinder part 6, and the dropped drug powder is received by the drug powder formed in the inner cylinder part 6. Received in room 7.

Further, in order to form the air outflow hole H2 in the capsule K, the operation plate is moved to the capsule holder 1 side to move the second piercing pin 28 toward the capsule K, and the capsule K is moved at the tip thereof. An air outflow hole H2 is bored in the hole. After that, the operation plate is returned to the original position and the tip is pulled out from the capsule K. This means that the capsule K has been pierced in preparation for administration.

Next, the dosing operation for spraying the drug powder in the perforated capsule K into the nasal cavity of the patient will be described.

First, each spray nozzle 22 is inserted into both nasal cavities of the patient, and as shown in FIG.
By crushing C in the direction of arrow P, an air flow is generated from the pump unit 19, and this air is caused to act on the air supply passage 4 to press the supply valve 13 against the valve opening amount regulation unit 6C of the inner cylinder unit 6. The air supply passage 4, the pump side passage 15,
It is made to flow into the capsule K from the air inflow hole H1 via each air backflow suppression passage 16, the chemical powder receiving chamber 7, and the pin insertion hole 9.
As a result, the air that has flowed into the capsule K becomes the air in which the medicinal powder is mixed by stirring the medicinal powder. Therefore, the air in which the medicinal powder is mixed passes through the air outflow hole H2, the left and right medicinal powder passages 25, 25. By spraying from the spray ports 26, 26 on the left and right sides, the drug powder can be simultaneously administered to the left and right nasal cavities of the patient.

At the time of administration of this medicinal powder, the air supplied from the pump portion 19 through the pump side passage 15 is passed through the circular passage portion 17 of each air backflow suppressing passage 16 through the cross passage portion 18 to the medicinal powder receiving chamber. Since it is distributed to the 7 side,
The low resistance circular passage portion 17 can be smoothly circulated to the high resistance cross passage portion 18, and air can be supplied to the chemical powder receiving chamber 7. As a result, the falling chemical powder received in the chemical powder receiving chamber 7 can be supplied to the capsule K side through the pin insertion hole 9 by the air supplied from each air backflow suppressing passage 16 into the chemical powder receiving chamber 7. Capsule K for falling medicine powder in medicine powder receiving chamber 7
It can be administered to a patient with the drug powder in.

On the other hand, when the force applied to the pressing portion 19C of the pump portion 19 is removed, the pressing portion 19C returns to the arrow R direction by the elastic force as shown by the chain double-dashed line in FIG. The inside of the pump unit 19 becomes a negative pressure and the valve body 2 of the suction valve 20.
0B is opened, and the outside air is sucked into the pump portion 19 through the suction passage 20A.

At this time, the supply valve 13 has the pump portion 19
Although the valve is seated in the air supply passage 4 and closed by the negative pressure inside, air will flow backward from each spray port 26 to the pump portion 19 side in a short time until the supply valve 13 is opened and closed. And

However, in this embodiment, the chemical powder receiving chamber 7 side of each air backflow suppressing passage 16 becomes a high resistance cross passage portion 18, and the flow resistance suppresses the invasion of air into the air backflow suppressing passage 16. Therefore, it is possible to prevent the backflow of the air containing the medicinal powder to the pump side passage 15 side.

Thus, according to the present embodiment, each air backflow suppression passage 16 is provided between the pump side passage 15 of the air flow passage 14 and the chemical powder receiving chamber 7 forming the storage chamber side passage, and each air backflow is provided. The suppression passage 16 includes a circular passage portion 17 having low resistance on the pump side passage 15 side and a cross passage portion 1 having high resistance on the chemical powder receiving chamber 7 side.
It is set to 8. As a result, the air supplied from the pump portion 19 via the pump-side passage 15 is smoothly circulated from the low-resistance circular passage portion 17 to the high-resistance cross passage portion 18 and is made to flow out to the powder receiving chamber 7 side. Therefore, the air flow can be reliably supplied from the pin insertion hole 9 into the capsule K, and the drug powder can be simultaneously administered to the left and right nasal cavities of the patient from each drug powder passage 25.

Moreover, even if the air tries to flow backward from the chemical powder receiving chamber 7 toward the pump side passage 15 side as when sucking the outside air into the pump portion 19, the chemical powder receiving chamber 7 of each air backflow suppressing passage 16 is shown. The side is a cross passage portion 18, and the cutout passage 18
Since high resistance is obtained by A, 18A, ..., Invasion of air into each of the air backflow suppressing passages 16 can be suppressed, and the backflow of air containing the medicinal powder to the pump side passage 15 side can be suppressed. Can be prevented.

As a result, it is possible to reliably prevent the valve closing failure of the supply valve 13 due to the adhesion and accumulation of the drug powder on the supply valve 13 as in the prior art, so that the chemical powder flows into the pump portion 19. Can be reliably prevented, and a prescribed amount of drug powder can be administered to a patient to enhance the efficacy of the drug powder.

Next, FIG. 6 shows a second embodiment of the present invention. The feature of this embodiment is that the air backflow suppressing passage has a single hole on the pump portion side and a porous hole on the chemical powder receiving chamber side. Especially. In addition,
In this embodiment, the same components as those shown in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 41 denotes an air backflow suppressing passage (only one is shown) according to the present embodiment, which is used in place of the air backflow suppressing passage 16 of the first embodiment. The inner cylindrical portion 6 is formed so as to pass through the cylindrical portion 6A in the radial direction, and thereby the pump side passage 15 and the chemical powder receiving chamber 7 forming the storage chamber side passage are communicated with each other. Here, the air backflow suppressing passage 41 is a large diameter passage portion 42 having a circular cross section with a large diameter single hole on the pump side passage 15 side, and the chemical powder receiving chamber 7 side is changed from the large diameter passage portion 42 to a large number. It is composed of small-diameter passage portions 43, 43, ... Which are branched small-diameter porous holes. As a result, the large diameter passage portion 42 has a large passage diameter and a small air flow resistance. On the other hand, each small-diameter passage portion 43 has a significantly smaller passage diameter than the large-diameter passage portion 42, so that the air flow resistance is large.

In this way, in this embodiment having the above-mentioned structure, it is possible to obtain substantially the same effects as the first embodiment, but especially in this embodiment, the chemicals in the air backflow suppressing passage 41 are The powder receiving chamber 7 side has a large number of small-diameter passage portions 43,
Since it is branched to 43, ..., The flow resistance of the air can be further increased by reducing the diameter of the passage, and the backflow of the air containing the drug powder can be surely suppressed.

Next, FIG. 7 shows a third embodiment of the present invention, which is characterized in that the passage section on the pump side passage side of the air backflow suppressing passage is made large and the passage on the chemical powder receiving chamber side is formed. The cross-sectional area is small. In this embodiment, the same components as those shown in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 51 denotes an air backflow suppressing passage (only one is shown) according to the present embodiment, which is used in place of the air backflow suppressing passage 16 of the first embodiment. The inner cylindrical portion 6 is formed so as to pass through the cylindrical portion 6A in the radial direction, and thereby the pump side passage 15 and the chemical powder receiving chamber 7 forming the storage chamber side passage are communicated with each other. Here, the air backflow suppressing passage 51 has a large diameter passage portion 52 on the side opening to the pump side passage 15 and a small diameter passage portion 53 on the side opening to the chemical powder receiving chamber 7. As a result, the large-diameter passage portion 52 has a large passage cross-sectional area and a small air flow resistance. On the other hand, in the small diameter passage portion 53, the passage cross-sectional area is small and the air flow resistance is large.

Thus, in this embodiment having the above-described structure, it is possible to obtain substantially the same effects as the first embodiment. However, in particular, in this embodiment, the inner diameter of the air backflow suppressing passage 51 is increased. However, the shape can be simplified, productivity can be improved, and cost can be reduced.

In each of the above embodiments, the circular passage portion 17 of the air backflow suppressing passages 16, 41, 51 and the large diameter passage portion 4 are provided.
Although the case where the small diameter passages 2, 52 and the small diameter passage portions 43, 53 are formed in a circular cross-section has been illustrated, these passages may be formed in another shape such as an elliptical cross section or a polygonal cross section.

Further, in the first embodiment, the chemical powder receiving chamber 7 side of each air backflow suppressing passage 16 is the cross passage portion 18, but the area of the inner wall can be made larger than that of the circular passage portion 17. However, it is not limited to the cross shape, and the notch passage is 6
You may provide eight pieces, eight pieces, etc.

Further, in each of the above embodiments, the passage member 21
It has been described that two drug powder passages 25, 25 are formed by branching to the left and right, and the drug is simultaneously administered to both the left and right nasal cavities of the patient from the left and right spray ports 26, 26. The drug powder passage may be one, and the left and right nasal cavities may be alternately dosed.

[0066]

As described above in detail, according to the first aspect of the invention, the air is discharged through the air flow passage and the air backflow suppressing portion by opening the supply valve from the pump portion and discharging the air. The medicinal powder can be injected into the powder containing chamber and sprayed from the medicinal powder spraying unit together with the medicinal powder in the medicinal powder containing chamber, and the medicinal powder can be administered to the patient. On the contrary, when inhaling outside air into the pump section, the chemical powder spraying section, before the supply valve is closed,
Air tries to flow backwards through the chemical powder storage chamber and air flow passage,
Since the backflow of air can be suppressed by the air backflow suppressing portion provided in the middle of the air flow passage, the backflow of the drug powder to the supply valve side can be prevented, and the drug powder flows into the pump unit. By preventing the drug, a prescribed amount of the drug powder can be administered to the patient to enhance the efficacy of the drug powder.

According to the second aspect of the invention, the air supplied from the pump section through the air flow passage is circulated from the low resistance pump section side of the air backflow suppressing section to the high resistance drug powder storage chamber side. As a result, the air can be smoothly circulated in the air backflow suppressing portion and supplied to the drug powder storage chamber. Further, when the outside air is sucked in to return the pump unit, by making the chemical powder containing chamber side of the air backflow suppressing unit have a high resistance,
Since it is possible to suppress the backflow of air into the air backflow suppressing portion,
It is possible to prevent the medicinal powder from flowing back to the supply valve side, prevent the medicinal powder from flowing into the pump portion, and administer a prescribed amount of the medicinal powder to the patient.

According to the third aspect of the present invention, the air supplied from the pump portion through the air flow passage is circulated from the low resistance circular hole of the air backflow suppressing portion to the high resistance non-circular hole. The air can be smoothly circulated in the air backflow suppressing unit to be supplied to the drug powder storage chamber, and when the outside air is sucked in to restore the pump unit, the air backflow suppressing unit has a high resistance to the drug powder storage chamber side. With such a non-circular hole, the backflow of air into the air backflow suppressing portion can be suppressed, so that the backflow of the drug powder to the supply valve side can be prevented and the drug powder can be prevented from flowing into the pump part. , A prescribed amount of medicinal powder can be administered to the patient.

According to the invention of claim 4, the air supplied from the pump portion through the air flow passage is circulated from the low resistance single hole of the air backflow suppressing portion to the high resistance porous hole, Air can be smoothly circulated in the air backflow suppressing portion and supplied to the drug powder storage chamber. On the other hand, when inhaling the outside air in order to return the pump unit, the backflow of air into the air backflow suppressing unit can be suppressed by making the chemical powder containing chamber side of the air backflow suppressing unit a high resistance porous hole. It is possible to prevent the medicinal powder from flowing back to the supply valve side, prevent the medicinal powder from flowing into the pump portion, and administer a prescribed amount of the medicinal powder to the patient.

According to the fifth aspect of the invention, the air supplied from the pump portion through the air flow passage has a small passage cross-sectional area and a high resistance from the side having a large passage cross-sectional area of the air backflow suppressing portion. By circulating the air to the side, the air can be smoothly circulated in the air backflow suppressing portion and can be supplied to the drug powder storage chamber. Further, when the outside air is sucked in to restore the pump portion, the backflow of air into the air backflow suppressing portion is made by forming a high resistance passage on the side of the chemical powder containing chamber of the air backflow suppressing portion with a small passage cross-sectional area. Since the medicinal powder can be suppressed from flowing back to the supply valve side, the medicinal powder can be prevented from flowing into the pump portion, and a prescribed amount of medicinal powder can be administered to the patient.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a nasal administration device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing an enlarged view of a capsule holder and the like in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part showing an arrow A portion in FIG. 2 in an enlarged manner.

FIG. 4 is an arrow view showing the air backflow suppressing passage in FIG. 3 from an arrow IV-IV direction.

FIG. 5 is a cross-sectional view seen from the same position as FIG. 1, showing a state in which the drug powder in the capsule is being sprayed by crushing the pump portion.

FIG. 6 is an enlarged cross-sectional view of an essential part seen from the same position as FIG. 3, showing an air backflow suppressing passage and the like according to a second embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of an essential part seen from the same position as FIG. 3, showing an air backflow suppressing passage and the like according to a third embodiment of the present invention.

[Explanation of symbols]

1 Capsule Holder (Medicater Main Body) 12 Capsule Storage Chamber (Medicated Powder Storage Chamber) 13 Supply Valve 16, 41, 51 Air Backflow Suppression Passage (Air Backflow Suppression Portion) 17 Circular Passage Portion (Circular Hole) 18 Cross Passage Portion (Non- Circular hole) 19 Pump part 25 Chemical powder passage (chemical powder passage part) 42 Large diameter passage part (single hole) 43 Small diameter passage part (perforated hole) 52 Large diameter passage part 53 Small diameter passage part

Continued on the front page (72) Inventor Kazunori Ishiseki 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisex Jex Co., Ltd. (72) Inventor Yoshiyuki Tanizawa 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisex Jex Co., Ltd. (72) Inventor Akira Yanagawa 5-3 Fujimigaoka, Tsuzuki-ku, Yokohama, Kanagawa

Claims (5)

[Claims] 1. A drug dispenser main body having a drug powder containing chamber for containing drug powder, a pump unit communicating with the drug dispenser body and discharging air through a supply valve, and a drug powder containing unit from the pump unit. An air flow passage formed in the main body of the drug dispenser toward the room, and a drug powder sprayer that communicates with the drug dispenser body and sprays the drug powder in the drug powder containing chamber by the air supplied through the air flow passage. And an air backflow suppressing unit that is provided in the middle of the air flow passage and suppresses the backflow of air from the chemical powder spraying unit to the supply valve side. 2. The drug dispenser according to claim 1, wherein the air backflow suppressing unit is configured to change the flow resistance of air so that the pump unit side has a low resistance and the drug powder storage chamber side has a high resistance. 3. The medication device according to claim 1, wherein the air backflow suppressing portion is configured by forming a circular hole on the pump portion side and a non-circular hole on the drug powder storage chamber side. 4. The drug dispenser according to claim 1, wherein the air backflow suppressing unit is configured by forming a single hole on the pump unit side and a multi-hole on the drug powder storage chamber side. 5. The medication device according to claim 1, wherein the air backflow suppressing portion is configured by increasing a passage cross-sectional area on the pump portion side and decreasing a passage cross-sectional area on the drug powder storage chamber side. .