JPH09253209A - Inhalation type medicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dose a prescribed amount of medical powder by preventing the medical powder in a capsule from being released into the air when coughing happens in a mediator for sucking medical powder in the capsule. SOLUTION: A flap valve 15 is formed in the course of an inflow path 12A of each of inflow side air paths. 12 for communication between a capsule insertion guide 9 formed in a capsule holder 8 and a capsule housing chamber 11. When sucking medical powder, the flap valve 15 is opened by an inhaling force of a patient and air flows in from the side of the atmospheric air to dose the medical powder. On the other hand, when coughing happens, the flap valve 15 is opened by the reversed air to block the reversion in the capsule housing chamber 11, thereby preventing the medical powder in the capsule from being released to the side of the atmospheric air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inhaler-type inhaler suitable for use in injecting a powdered drug (medicine powder) into the lungs by inhaling a patient's breath.

[0002]

2. Description of the Related Art Generally, a method of administering a drug to the lungs of an asthmatic patient includes a method of injecting a drug solution, a method of inhaling with a liquid aerosol sprayer, and a powdery form filled in a drug powder storage chamber or a capsule. A method of inhaling a drug (hereinafter referred to as medicinal powder) is used.

Among these drug administration methods for asthma patients,
In the method of inhaling the medicinal powder filled in a capsule, the patient has an inlet port in which a mouth is provided, and one side is opened to the atmosphere side and the other side is provided with a ventilation path opened to the inlet port through a capsule storage chamber. Using the inhaler described above, the capsule is mounted in the capsule storage chamber of the inhaler, and a hole communicating with the air passage is formed in the capsule using a piercing needle or the like. Then, in this state, the medicine powder in the capsule is discharged into the inhalation port by the airflow passing through the ventilation passage by sucking the breath in addition to the inhalation port,
It is inhaled into the patient's lungs.

[0004]

By the way, in the inhaler for capsules according to the prior art described above, the medicinal powder in the capsule is inhaled through the air passage by inhaling the breath from the inhalation port.

However, when inhaling the medicinal powder, the patient may cough, and in this case, air flows backward from the inhalation port to the side of the air passage, and the medicinal powder in the capsule is discharged to the outside. As a result, the amount of powder in the capsule decreases,
There is a problem that a prescribed amount of medicinal powder cannot be inhaled, and the efficacy of the medicinal powder is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and prevents the drug powder in the drug powder storage chamber or the capsule from being discharged to the outside by the air flowing back into the suction port, thereby storing the drug powder. An object of the present invention is to provide an inhalation-type medication device in which the drug powder in a chamber or capsule can be reliably administered to a patient.

[0007]

In order to solve the above-mentioned problems, in the inhalation-type medication device according to the invention of claim 1, one side in the axial direction serves as a medicine powder storage chamber and the other side inhales the medicine powder. In order to supply air to the drug dispenser body that has become an intake port, and the drug powder containing chamber of the drug dispenser body, an inflow side air passage that connects the atmosphere side and the drug powder containing chamber, and the drug of the drug dispenser body In order to supply the medicinal powder in the powder storage chamber to the suction port side, an outflow side air passage communicating between the chemical powder storage chamber and the suction port, and from the chemical powder storage chamber when a backflow occurs from the suction port It is configured by a backflow prevention valve provided in the middle of the inflow side ventilation passage for blocking air flowing back to the atmosphere side.

With the above structure, when the patient sucks air through the suction port, air is supplied to the drug powder storage chamber from the atmosphere side through the inflow side ventilation passage, and the drug is supplied by the supplied air. The drug powder in the powder storage chamber is mixed with air, and the air mixed with the drug powder is discharged into the lungs through the outflow side air passage and the suction port. On the other hand, if the patient coughs while holding the inhalation port and causes air to flow back into the inhalation port, the backflow prevention valve will close due to the air flowing from the drug powder storage chamber toward the inflow side air passage. Since the inflow side air passage is closed, it is possible to prevent the backflowing air from flowing to the atmosphere side through the inflow side air passage, and to prevent the drug powder in the drug powder storage chamber from being discharged to the air side.

In the inhalation-type medication device according to the second aspect of the present invention, one side in the axial direction is a capsule chamber for accommodating the capsule filled with the medicinal powder, and the other side is an inhalation port for inhaling the medicinal powder. In order to supply air into the capsule contained in the capsule container of the drug dispenser body,
An inflow-side air passage that connects the atmosphere side and the capsule storage chamber, and the capsule storage chamber and the suction port for supplying the drug powder in the capsule stored in the capsule storage chamber of the drug dispenser body to the suction port side. When a backflow occurs from the outflow side air passage that communicates with the inhalation side and the capsule in the capsule containing chamber to form a hole that communicates with each of the air passages, a punching tool provided in the main body of the medication dispenser, and the suction port. In addition, the backflow prevention valve is provided in the middle of the inflow side ventilation passage for blocking the air flowing back from the chemical powder storage chamber to the atmosphere side.

With the above construction, the capsule accommodated in the capsule accommodating chamber is perforated by the perforation tool so as to communicate with each air passage. When the patient sucks air through the suction port, air is supplied to the capsule housing chamber from the atmosphere side through the inflow side air passage, and the capsule housing chamber is housed by the supplied air. The medicinal powder in the capsule is mixed with air, and the air mixed with the medicinal powder is discharged into the lung through the outflow passage and the suction port. On the other hand, if the patient coughs while holding the inhalation port and causes air to flow back into the inhalation port, the backflow prevention valve closes due to the air flowing from the capsule storage chamber toward the inflow side air passage. Since the side air passage is closed, it is possible to prevent the backflowing air from flowing to the atmosphere side through the inflow side air passage, and prevent the drug powder in the capsule from being released to the atmosphere side.

According to a third aspect of the present invention, the check valve is rotatably provided in the inflow passage, and is opened when air is sucked in from the suction port and is blown out to the suction port. Is formed as a flap valve that closes the inflow passage.

With the above structure, when the patient sucks air through the suction port, the flap valve is rotated and opened by the air flowing from the atmosphere side through the inflow air passage to open the drug powder storage chamber or capsule. Air is supplied to the storage chamber from the atmosphere side via the inflow side air passage, and the supplied air mixes the drug powder in the drug powder storage chamber or the capsule housed in the capsule storage chamber with the air. The air mixed with the powder is discharged into the lungs through the outflow side air passage and the suction port. On the other hand, if the patient coughs while holding the inhalation port and causes air to flow back into the inhalation port, the flap valve is closed by the air flowing from the drug powder storage chamber or capsule storage chamber toward the inflow side air passage. Since the valve closes the inflow side air passage, the backflowing air is prevented from flowing to the atmosphere side through the inflow side air passage, and the medicinal powder in the medicinal powder storage chamber or the capsule stored in the capsule storage chamber is prevented. Can be prevented from being released to the atmosphere side.

According to a fourth aspect of the present invention, the check valve is provided in the middle of the inflow side ventilation passage, and has a large diameter valve body accommodating portion having a valve seat on one side and a valve body on the other side, and the valve. A valve body movably provided in the body accommodating portion, the valve body opens when air is sucked from the suction port, and the inflow side air passage is opened when air is blown out to the suction port. It is configured to close the valve.

With the above structure, when the patient draws in air through the suction port, the valve body separates from the valve seat of the valve body accommodating portion to open the valve, and thus the drug powder accommodating chamber or the capsule accommodating chamber is opened. Is supplied with air from the atmosphere side via the inflow side air passage, and the supplied air mixes the drug powder in the drug powder storage chamber or the capsule housed in the capsule storage chamber with air, and the drug powder is mixed. The generated air is discharged into the lungs through the outflow passage and the suction port. On the other hand, if the patient coughs while holding the suction port and causes air to flow back into the suction port, the valve body sits on the valve seat of the valve body housing and closes to block the inflow side air passage. Therefore, the backflowing air is prevented from flowing to the atmosphere side through the inflow side air passage, and the drug powder in the drug powder storage chamber or the capsule housed in the capsule storage chamber is released to the air side. It can be prevented.

According to a fifth aspect of the present invention, the check valve is formed in the middle of the inflow side air passage, one side is a valve seat and the other side is a valve body receiver, and an air escape groove is provided on the outer periphery of the valve body receiver. The valve body accommodating portion has a large diameter, and a valve body movably provided in the valve body accommodating portion. The valve body opens when air is sucked from the suction port, and air is sucked into the suction port. The inflow-side air passage is closed when it blows out.

With the above structure, when the patient draws in air through the suction port, the valve body separates from the valve seat of the valve body accommodating portion to open the valve, and is opened in the drug powder accommodating chamber or the capsule accommodating chamber. Is supplied with air from the atmosphere side via the inflow side air passage, and the supplied air mixes the drug powder in the drug powder storage chamber or the capsule housed in the capsule storage chamber with air, and the drug powder is mixed. The generated air is discharged into the lungs through the outflow passage and the suction port. Moreover, when the valve is opened, the air escape groove can secure the amount of air in the inflow passage. On the other hand, if the patient coughs while holding the suction port and causes air to flow back into the suction port, the valve body sits on the valve seat of the valve body housing and closes to block the inflow side air passage. Therefore, the backflowing air is prevented from flowing to the atmosphere side through the inflow side air passage, and the drug powder in the drug powder storage chamber or the capsule housed in the capsule storage chamber is released to the air side. It can be prevented.

In a sixth aspect of the present invention, one side in the axial direction serves as a medicine powder accommodating chamber, and the other side serves as an intake port for inhaling the medicine powder, and air is supplied to the medicine powder accommodating chamber in the medicine dispensing body. In order to supply the drug, the inflow side air passage communicating between the atmosphere side and the drug powder storage chamber, and the drug powder in the drug powder storage chamber of the drug dispenser main body are supplied to the suction port side. An outflow-side air passage communicating with the mouth, a bypass passage formed between the inflow-side air passage and the outflow-side air passage to bypass the chemical powder storage chamber, and a backflow from the suction port. In this case, the backflow prevention valve is provided between the inflow side ventilation passage and the bypass passage to block the air that flows back from the chemical powder storage chamber to the atmosphere side.

With the above structure, when the patient sucks air through the suction port, the check valve is opened and air is supplied from the atmosphere side to the drug powder storage chamber through the inflow side ventilation passage. The supplied air mixes the drug powder in the drug powder storage chamber with air, and discharges the air mixed with the drug powder into the lungs through the outflow passage and the suction port. On the other hand, when the patient coughs while holding the intake port and causes air to flow back into the intake port, the backflow prevention valve closes due to the air flowing through the bypass passage, causing the powder inside the powder storage chamber to move to the atmosphere side. Can be prevented from being released. Moreover, since the air flowing through the bypass passage flows faster than the air passing through the drug powder storage chamber,
The backflow prevention valve can be closed before air flows into the inflow side ventilation passage via the chemical powder storage chamber during backflow.

According to a seventh aspect of the present invention, one side in the axial direction is a capsule storage chamber for storing a capsule in which drug powder is filled, and the other side is a suction port for inhaling the drug powder, and In order to supply air into the capsule accommodating chamber of the drug dispenser main body, an inflow side air passage that connects the atmosphere side and the capsule accommodating chamber, and the capsule accommodated in the capsule accommodating chamber of the drug dispenser main body. The capsule storage chamber is located between the outflow-side air passage that connects the capsule storage chamber and the suction port, and the inflow-side airflow passage and the outflow-side airflow passage for supplying the medicinal powder therein to the suction-port side. Between the inflow side ventilation passage and the bypass passage for blocking the air flowing back to the atmosphere side from the chemical powder storage chamber when a backflow occurs from the suction port. From the check valve provided on the There in that form.

With the above structure, when the patient sucks air through the suction port, the check valve is opened, and air is supplied from the atmosphere side to the drug powder storage chamber through the inflow side ventilation passage. The supplied air mixes the drug powder in the capsule housed in the capsule housing chamber with air, and discharges the air mixed with the drug powder into the lungs through the outflow passage and the suction port. On the other hand, when the patient coughs while holding the inhalation port and causes air to flow back into the inhalation port, the backflow prevention valve is closed by the air flowing through the bypass passage and the inside of the capsule accommodating chamber is closed. It is possible to prevent the chemical powder from being released to the atmosphere side. Moreover, the air flowing through the bypass passage is
Because it flows faster than the air passing through the capsule chamber,
The backflow prevention valve can be closed before air flows into the inflow side air passage via the capsule housing chamber during backflow.

According to the invention of claim 8, the check valve is formed at a position where the inflow side air passage and the bypass passage are connected, and one side serves as a one-side valve seat for closing the inflow side air passage and the other side serves as a bypass. It is composed of a large-diameter valve body accommodating portion serving as the other side valve seat that closes the passage, and a valve body movably provided in the valve body accommodating portion. When inhaled, it sits on the other side valve seat to close the bypass passage, while opening the inflow side air passage, and when air is blown out to the intake port, it sits on the one side valve seat by the air flowing through the bypass passage. Then, the inflow side air passage is closed.

With the above construction, during suction operation, the valve body of the check valve is seated on the other side valve seat of the valve body accommodating portion to close the bypass passage and open the inflow side ventilation passage to open the inflow side ventilation. Air is allowed to flow from the atmosphere side into the drug powder storage chamber or the capsule storage chamber through the passage. On the other hand, at the time of reverse flow, the valve body of the check valve is seated on the valve seat on one side of the valve body housing to close the inflow side air passage, and the air from the drug powder storage chamber or the capsule storage chamber side inflows the inflow side air. It is possible to prevent the medicine powder from flowing through the passage to the atmosphere side, and to prevent the medicine powder in the medicine powder accommodation chamber or the capsule accommodated in the capsule accommodation chamber from being released to the atmosphere side. Moreover, since the air flowing through the bypass passage flows faster than the air passing through the drug powder storage chamber or the capsule storage chamber, before the air flows into the inflow side ventilation passage through the drug powder storage chamber or the capsule storage chamber during backflow. The check valve can be closed.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an inhalation-type medication device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 17 of the accompanying drawings.

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

In FIG. 1, reference numeral 1 denotes a suction piece which forms an outer shell of an inhalation-type medicine dispenser and constitutes a main body of the medicine dispenser together with a capsule holder 8 which will be described later. The suction piece 1 includes a holder accommodating portion 2 and an intake port 4 which will be described later. It consists of

Reference numeral 2 denotes one side (inflow side) of the suction piece 1 in the axial direction.
Shows a substantially cylindrical holder accommodating portion provided on the outer peripheral side of the holder accommodating portion 2, and a guide cylinder portion 3 for guiding a support portion 17 of a punching tool 16 to be described later is provided so as to project radially outward. ing. Further, an annular step portion 2A into which the stopper portion 8A of the capsule holder 8 is fitted is formed on one end side of the holder accommodating portion 2, and an intake port 4 is attached to the other end side (outflow side) thereof. The inner peripheral side of the mouth 4 is an inhalation passage 5 for inhaling the medicinal powder mixed in the air into the lungs.

Further, the guide tube portion 3 of the holder accommodating portion 2
Pin holes 6 and 7 are respectively formed in the inside in the radial direction, and the pin holes 6 are pin insertion holes 12 of each inflow side air passage 12 described later.
Corresponding to B, the pin hole 7 corresponds to the pin insertion hole 13B of each outflow side air passage 13.

Reference numeral 8 denotes a capsule holder which is inserted into the holder accommodating portion 2 and constitutes the main body of the drug dispenser together with the suction piece 1. The capsule holder 8 is formed in a cylindrical shape, and the holder accommodating portion is formed on the outer periphery at one end side thereof. An annular stopper portion 8A that fits on one end side of 2 is formed, and the capsule holder 8 is positioned in the holder accommodating portion 2 by the stopper portion 8A. Further, on one end side of the capsule holder 8, there is formed a capsule insertion guide 9 which has a diameter reduced from the outer circumference at one end toward the center and serves as a capsule insertion port for guiding the capsule K into the capsule housing chamber 11 described later. With
On the other end side, an outflow side taper surface portion 10 is formed in which the outer peripheral surface is gradually reduced in diameter toward the other side.

Further, in the central portion of the capsule holder 8,
A bottomed hole-shaped capsule accommodating chamber 11 that extends in the axial direction and opens to the capsule insertion guide 9 is formed, and the capsule accommodating chamber 11 is filled with a powdered medicine (hereinafter referred to as medicinal powder). The capsule K (shown in FIG. 3) is adapted to be inserted from one side.

Reference numerals 12 and 12 denote two inflow side air passages provided on one side of the capsule holder 8. Each inflow side air passage 12 is located on the outer peripheral side of the capsule holder 8 and the capsule insertion guide 9 is provided. An inflow passage 12A formed in the axial direction so as to open in the axial direction, and a pin insertion hole 12B communicating with the inflow passage 12A and formed in the radial direction so as to open in the inner circumference of the capsule housing chamber 11, The pin insertion holes 12B, 1
2B is arranged coaxially with the pin hole 6.

In the inflow passage 12A, an arcuate step portion 12A1 is formed in the middle of the inflow passage 12A by slightly shifting the axes of the passage on the atmosphere side and the passage on the capsule accommodation chamber 11 side. The step 12A has a step 12A
A flap valve 15, which will be described later, having 1 as a stopper is provided.

Reference numerals 13 and 13 denote two outflow-side air passages provided on the other side of the capsule holder 8. Each of the outflow-side air passages 13 is located on the outer peripheral side of the capsule holder 8 and has an outflow-side taper. Outflow groove 13A formed in a groove shape so as to cut out the surface portion 10 in the axial direction, and a pin insertion hole formed in the radial direction so as to communicate with the outflow groove 13A and open to the inner circumference of the capsule housing chamber 11. 13B and the pin insertion hole 13
B and 13B are arranged coaxially with the pin hole 7.

Capsules holders 14 and 14 are offset from the respective inflow side air passages 12 and outflow side air passages 13 by about 90 degrees.
2 shows two auxiliary air passages formed so as to pass through in the axial direction, and each of the auxiliary air passages 14 increases the amount of air flowing at the time of inhalation to eliminate stuffiness.

Reference numerals 15 and 15 denote flap valves as check valves provided in a step portion 12A1 located at an axially intermediate portion of the inflow passage 12A of each inflow side ventilation passage 12, and each flap valve 15 is as shown in FIG. As shown in 2, the inflow passage 1 in the closed state
2A is formed into a disk shape that substantially closes and is integrally formed with the capsule holder 8 via a thin hinge portion 15A on the upper end side, and the thin hinge portion 15A rotatably supports the flap valve 15. . Further, a step portion 12A1 functioning as a stopper is located around the lower side of the flap valve 15, and the step portion 12A1 defines the closing position of the flap valve 15.

When the patient inhales air from the intake port 4, the flap valves 15 have a negative pressure on the downstream side of the flap valves 15 and a pressure difference from the upstream side of the flap valves 15. Thus, as shown in FIG. 4, the valve rotates by opening in the direction of the arrow A to allow the air to flow in the capsule K.

On the other hand, when the patient coughs while holding the suction port 4 and blows air into the suction passage 5 of the suction port 4 to make it flow backward, the air flowing out from the capsule housing chamber 11 causes the flap valves 15 to move. 5 rotates in the direction of the arrow B to block the inflow passage 12A as shown in FIG.
Prevent backflow from A to the atmosphere side.

On the other hand, 16 is a drilling tool provided in the holder accommodating portion 2 for drilling a total of four holes H, H, ... The punching tool 16 has a support portion 17 movably provided in the guide tube portion 3, a base end side thereof fixed to the support portion 17, and a tip end side of the ventilation passages 12 and 13 through the pin holes 6 and 7. The pin 18 and the pin 18 are inserted into the holes 12B and 13B, and the tip of each pin 18 serves as a sharp needle tip 18A for making each hole H in the capsule K. Further, between the support part 17 and the holder accommodating part 2, the support part 17 is provided.
A spring 19 is arranged to urge each pin 18 to return to its initial position via. And the punching tool 16
When the support portion 17 is pushed toward the holder accommodating portion 2, the needle tip 18A of each pin 18 is moved from the pin holes 6 and 7 through the pin insertion holes 12B and 13B.
Puncture into the inner capsule K, and four holes H in the capsule K
Is formed.

The drug dispenser according to the present embodiment has the above-mentioned structure. Next, the operation for the patient to inhale the medicinal powder will be described with reference to FIGS. 3 and 4.

First, the capsule K is placed in the capsule accommodation chamber 11.
When inserting the capsule holding chamber 1, the capsule holder 8 is attached to the capsule holding chamber 11 as shown in FIG.
Insert the capsule K into 1 from one side. Since one end surface of the capsule holder 8 serves as a capsule insertion guide 9, the capsule K can be easily guided into the capsule housing chamber 11.

Then, in order to make holes H, H, ... In the capsule K, the support portion 17 of the hole making tool 16 is pushed toward the holder accommodating portion 2, and the needle tip 18A of each pin 18 is made into each air passage 1.
The pin insertion holes 12B and 13B on the opposite side are penetrated through the capsule K in the capsule accommodation chamber 11 from the pin insertion holes 12B and 13B of Nos.
By piercing up to, four holes H can be formed in the capsule K. Further, after forming each hole H in the capsule K, the external force to the support portion 17 is removed, so that each pin 18 is inserted into the pin insertion hole 12 by the biasing force of the spring 19.
B, 13B and capsule K are pulled out and returned to the initial position.

Next, the flow of air and the movement of the drug powder in the inhalation-type medication device when the patient inhales the drug powder will be described.

First, when the patient holds his / her mouth through the suction port 4 and inhales, as shown in FIG. 4, the suction force of the patient acting on the flap valve 15 provided in the inflow passage 12A is changed to the outflow side air passage 13 as shown in FIG. , The capsule K installed in the capsule housing chamber 11 and the inflow side air passage 12 simultaneously work to open the respective flap valves 15 in the arrow A direction. Then, the air on the capsule insertion guide 9 side flows into the inhalation-type medication device from each inflow side air passage 12, and the air flowing in from each inflow side air passage 12 from the inflow passage 12A of each inflow side air passage 12. It flows into the capsule K through the pin insertion hole 12B and the hole H,
The air flow causes the drug powder in the capsule K to be agitated and mixed into the air. The medicinal powder mixed in the air in the capsule K is discharged from the capsule K into the holes H and the outflow passages 1
It flows out to the suction passage 5 side through the pin insertion hole 13B of 3 and the outflow groove 13A. As a result, the medicinal powder flowing out from the capsule K into the suction passage 5 is jetted into the inhalation passage 5 of the inhalation port 4 and the mouth of the patient in a state of being diffused in the air, and the medicinal powder is passed through the trachea or the like into the lung. Can be reached.

Further, during this suction operation, air is circulated from each auxiliary ventilation passage 14 toward the suction passage 5 as well, thereby eliminating the stuffy breath when inhaling.

On the other hand, when the patient coughs during the inhalation of the medicinal powder, that is, when air is blown out into the suction passage 5 of the suction port 4, the blown out air is the outflow groove 1 of the outflow side ventilation passage 13.
3A, the pin insertion hole 13B, the capsule storage chamber 11, and the pin insertion hole 12B of the inflow-side air passage 12 and the inflow passage 12A to flow toward the atmosphere. However, the flap valve 15 is provided in the middle of the inflow passage 12A of each of the inflow side ventilation passages 12.
Therefore, each flap valve 15 is rotated in the direction of arrow B in FIG. 5 by the blown air to close the inflow passage 12A. As a result, it is possible to prevent the blown air from flowing backward through the inflow-side air passage 12, and thereby to prevent the drug powder in the capsule K from being released to the atmosphere side.

Thus, in the present embodiment, when air is sucked in through the suction port 4 in order to suck the chemical powder, the flap valve 15 provided in the inflow passage 12A of each inflow side air passage 12 is opened. By doing so, air is circulated from the capsule insertion guide 9 side into the capsule housing chamber 11, and the drug powder in the capsule K housed in the capsule housing chamber 11 is passed through the outflow side ventilation passage 13 and the suction passage 5. It can be administered into the lungs of a patient.

On the other hand, when the patient coughs with the suction port 4 held, the flap valve 15 is closed by the air flowing out of the capsule chamber 11 to close the inflow side air passage 1
It is possible to prevent a backflow from occurring in Nos. 2 and 12. Therefore, for example, the air blown out by coughing etc.
It is possible to prevent the drug powder inside from being discharged to the atmosphere side through the inflow side ventilation passage 12. As a result, it is possible to prevent the amount of the drug powder in the capsule K from decreasing, efficiently inhale the drug powder, and to administer a prescribed amount of the drug powder to the patient, so that the efficacy of the drug powder can be enhanced.

Next, FIGS. 6 to 9 show a second embodiment of the present invention. The feature of this embodiment is that the ball valve element prevents backflow in the middle of the inflow side air passage formed in the capsule holder. There is a valve. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 21 denotes a capsule holder according to this embodiment which is used in place of the capsule holder 8 of the first embodiment, and the capsule holder 21 is inserted into the holder accommodating portion 2 of the suction piece 1. The main body of the medicine dispenser is constructed with the suction piece 1. Further, the capsule holder 21 is formed in a columnar shape, and an annular stopper portion 21A is formed on the outer periphery of one end side thereof, and the capsule holder 21 is positioned in the holder accommodating portion 2 by the stopper portion 21A. In addition, on one end side of the capsule holder 21, the capsule insertion guide 2 whose diameter is reduced from the outer circumference of one end toward the center
2 is formed, and at the other end side, an outflow side taper surface portion 23 whose outer peripheral surface is gradually reduced in diameter toward the other side is formed.

Further, in the center of the capsule holder 21, there is formed a bottomed hole-shaped capsule accommodating chamber 24 which extends in the axial direction and opens to the capsule insertion guide 22. The capsule K filled with is inserted from one side.

Reference numerals 25 and 25 denote two inflow side air passages provided on one side of the capsule holder 21, and each of the inflow side air passages 25 is formed in the axial direction by opening to the capsule insertion guide 22. It is composed of an inflow passage 25A and a pin insertion hole 25B which is formed in the radial direction so as to communicate with the inflow passage 25A and open to the inner periphery of the capsule housing chamber 24. The pin insertion holes 25B and 25B are the pin holes 6 It is arranged coaxially with.

A large diameter is formed from the intermediate portion of the inflow passage 25A to the portion communicating with the pin insertion hole 25B, and this large diameter portion serves as a valve accommodating portion 29 of the check valve 28 described later. There is.

Reference numerals 26 and 26 denote two outflow-side air passages provided on the other side of the capsule holder 21. Each of the outflow-side air passages 26 is formed by cutting out the outflow-side tapered surface portion 23 in the axial direction. Outflow groove 26A formed in the shape of a concave groove, and the outflow groove 26
And a pin insertion hole 26B formed in the radial direction so as to communicate with A and open to the inner circumference of the capsule housing chamber 24,
The pin insertion holes 26B, 26B are arranged coaxially with the pin hole 7.

Reference numerals 27 and 27 denote two auxiliary air passages (only one is shown), and each auxiliary air passage 27 is displaced by about 90 degrees from each inflow side air passage 25 and outflow side air passage 26. It is formed so as to penetrate the capsule holder 21 in the axial direction.

Reference numerals 28 and 28 denote check valves. The check valves 28 are formed to have a large diameter from the intermediate portion of the inflow passage 25A of each inflow side air passage 25 to the pin insertion hole 25B.
The one side of the capsule insertion guide 22 side becomes the valve seat 29A,
The other side of the pin insertion hole 25B is composed of a valve body accommodating portion 29 having a valve body receiving portion 29B, and a ball valve body 30 movably arranged in the valve body accommodating portion 29.

Here, the valve disc receiver 2 of the valve disc accommodating portion 29.
As shown in FIG. 7, 9B is formed by a cross-shaped beam body, and the valve body receiver 29B defines that the ball valve body 30 moves to the outflow side in the valve body housing portion 29.

When the patient inhales air from the suction port 4, the respective backflow preventive valves 28 have a negative pressure on the downstream side from the respective backflow preventive valves 28, and therefore the upstream side of the respective backflow preventive valves 28. The pressure difference between and causes the ball valve element 30 to move in the direction of arrow A as shown in FIG. 8, and allows air to flow in the capsule K.

On the other hand, when the patient coughs while holding the suction port 4 and blows air into the suction passage of the suction port to cause reverse flow, the ball valve body 30 is moved in the direction of arrow B as shown in FIG. The ball valve body 30 is seated on the valve seat 29A,
The inflow passage 25A is closed. The air flowing out through the capsule K is prevented from flowing backward from the inflow passage 25A to the atmosphere side.

Also in the inhalation-type medication device according to the present embodiment,
It is possible to obtain the same effect as the first embodiment described above, and when the patient inhales air from the inhalation port to inhale the medicinal powder, the backflow provided in each inflow side air passage 25. By opening the prevention valve 28, air is circulated from the capsule insertion guide 22 side into the capsule housing chamber 24,
The medicinal powder in the capsule K stored in the capsule storage chamber 24 can be administered into the lungs of the patient via the outflow side air passage 26 and the inhalation passage.

On the other hand, when the patient coughs while holding the suction port, the backflow preventive valve 28 is closed by the air flowing out from the capsule housing chamber 24, and the ventilation passages 25, 26.
Backflow can be prevented from occurring.

Therefore, it is possible to prevent the air blown out by coughing, etc. from releasing the drug powder in the capsule K to the atmosphere side through the inflow side air passage 25, so that the drug powder in the capsule K is reduced. It is possible to efficiently inhale the medicinal powder and to administer a prescribed amount of the medicinal powder to the patient.

Further, FIGS. 10 to 12 show the third embodiment of the present invention. The feature of this embodiment is that a check valve by a ball valve body is provided in the middle of the inflow side ventilation passage formed in the capsule holder. The check valve is provided with a valve body accommodating portion for accommodating a ball valve body, a valve seat on one side and a valve seat on the other side, and an air escape groove is formed on the outer periphery of the valve seat. In this embodiment, the same components as those of the second embodiment described above are designated by the same reference numerals and the description thereof will be omitted. Further, in this embodiment, only one check valve is shown.

In the figure, 31 is a check valve according to this embodiment, which is located in the middle of the inflow passage 25A of each inflow side air passage 25 and has a large diameter. The capsule seating guide 22 side serves as a valve seat 32A, and the annular step portion on the other side pin insertion hole 25B side serves as a valve body receiving portion 32B, and a movably arranged inside the valve body housing portion 32. It comprises a ball valve body 33 provided and a concave air escape groove 34 formed on the outer periphery of the valve body receiver 32B from the valve body accommodating chamber 32 to the pin insertion hole 25B side.

Here, the air escape groove 34 is shown in FIG.
As shown in, the air that is formed in a concave shape from the valve body accommodating portion 32 downward and flows toward the capsule K side when the ball valve body 33 moves to the valve body receiver 32B on the valve body receiver 32B side. Is made to flow in a large amount through the air escape groove 34.

Then, each check valve 31 according to the present embodiment.
Then, when the patient inhales air from the suction port, the downstream side of the check valve 31 has a negative pressure. Therefore, the ball valve element 33 is caused by the pressure difference between the check valve 31 and the upstream side.
Move in the direction of arrow A as shown in FIG.
Allow air to flow inside. At this time, a large amount of air can be made to flow into the capsule K via the air escape groove 34, and as compared with the second embodiment, the medicinal powder and air in the capsule K are effectively mixed, Dosing efficiency can be increased.

On the other hand, when the patient coughs while holding the suction port and blows air into the suction passage of the suction port to cause reverse flow, the ball valve element 33 is moved in the direction of arrow B as shown in FIG. The ball valve element 33 is moved to sit on the valve seat 32A, and the inflow passage 25A is closed. Then, the air flowing out through the capsule K is prevented from flowing backward from the inflow passage 25A to the atmosphere side.

This embodiment also has the same operation and effect as those of the above-mentioned second embodiment, but especially the check valve 3
1 has an air escape groove 34 that allows a large amount of air to flow when opened.
Since a large amount of air can be made to flow into the air escape groove 34 toward the capsule K, the chemical powder can be efficiently sucked.

Next, FIGS. 13 to 15 show a fourth embodiment of the present invention.
The feature of the present embodiment is that the capsule holder is located between the inflow side air passage and the outflow side air passage, and the bypass passage is formed in parallel with the capsule storage chamber.
A check valve is provided at the intersection of the bypass passage and the inflow passage, and the check valve includes a large-diameter valve body housing having valve seats on one side and the other side, and the valve body housing. It is composed of a ball valve element that is movably provided in the section. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 41 denotes a capsule holder according to this embodiment which is used in place of the capsule holder 8 of the first embodiment, and the capsule holder 41 has a stopper portion 41A.
The capsule holder 41 to the holder accommodating portion 2
The capsule insertion guide 42 is formed on one end side, and the outflow side tapered surface portion 43 is formed on the other end side.

Further, at the center of the capsule holder 41, there is formed a bottomed hole-shaped capsule accommodating chamber 44 which opens to the capsule insertion guide 42, and the capsule K is filled with medicinal powder. Is inserted from one side.

Reference numerals 45 and 45 denote two inflow side air passages provided on one side of the capsule holder 41. Each of the inflow side air passages 45 is formed in the axial direction by opening to the capsule insertion guide 42. It is composed of an inflow passage 45A and a pin insertion hole 45B which communicates with the inflow passage 45A and is formed in the radial direction so as to open to the inner circumference of the capsule housing chamber 44. The pin insertion holes 45B and 45B are the pin holes 6 and 6. Of the respective pin insertion holes 45B, the pin insertion hole 45B for communicating the capsule accommodating chamber 44 and the pin hole 6 is formed as a through hole, and the other pin insertion hole 45B is for accommodating a valve body described later. Part 5
It is open to zero.

Reference numerals 46 and 46 denote two outflow-side air passages provided on the other side of the capsule holder 41. Each of the outflow-side air passages 46 is formed by cutting out the outflow-side tapered surface portion 43 in the axial direction. Outflow groove 46A formed in the shape of a concave groove, and the outflow groove 46A
And a pin insertion hole 46B formed in the radial direction so as to communicate with A and open to the inner periphery of the capsule housing chamber 44,
The pin insertion holes 46B, 46B are arranged coaxially with the pin hole 7.

Reference numerals 47 and 47 denote two auxiliary air passages, and each auxiliary air passage 47 is axially displaced from the capsule holder 41 at a position displaced by about 90 degrees from each inflow side air passage 45 and outflow side air passage 46. Is formed so as to penetrate through.

Reference numerals 48 and 48 denote bypass passages. The bypass passages 48 are arranged coaxially with the inflow passage 45A of the inflow side air passage 45 and the outflow groove 46A of the outflow side air passage 46, and are arranged in parallel with the capsule accommodating chamber 44. It is formed so that.

Reference numerals 49 and 49 denote backflow prevention valves. Each of the backflow prevention valves 49 is provided at the intersection of the inflow side ventilation passage 45 and the bypass passage 48, and the pin insertion hole 4 of the inflow passage 45A.
5B side and the pin insertion hole 45B side of the bypass passage 48 are formed with a large diameter, one side is the one side valve seat 50A, the other side is the other side valve seat 50B, and the valve body housing portion The ball valve element 51 is movably disposed in the portion 50.

Then, each check valve 49 according to the present embodiment.
When the patient inhales air from the suction port, the bypass passage 48 has a negative pressure. Therefore, the ball valve body 51 in the valve body accommodating portion 50 moves quickly in the direction of arrow A in FIG. Then, the other side valve seat 50B is seated and the bypass passage 48 is closed. Then, the inflow side air passage 45 is opened to allow the air from the capsule insertion guide 42 side to flow into the capsule K. At this time, the ball valve element 51 is connected to the inflow side ventilation passage 45.
Since it does not exist in the middle of the process, each backflow prevention valve 49 can be prevented from becoming an air resistance at the time of sucking the drug powder, and a specified amount of the drug powder in the capsule K can be dispensed.

On the other hand, when the patient coughs while holding the suction port and blows air into the suction passage of the suction port to cause reverse flow, the bypass passage 48 is opened as shown in the direction of arrow B in FIG. The ball valve element 51 is immediately moved to one side via the ball valve element 51, and the ball valve element 51 is seated on the one side valve seat 50A.
The inflow passage 45A is closed. Then, it is possible to prevent the air flowing into the inflow passage 45A via the capsule K from flowing to the atmosphere side.

Moreover, before the blown air reaches the check valve 49 via the inside of the capsule K, the bypass passage 4
Since the backflow prevention valve 49 can be closed by the air flow from 8, the drug powder in the capsule K is not discharged to the atmosphere side at all, and a specified amount of drug powder can be administered to the patient.

16 and 17 show a fifth embodiment of the present invention. The feature of this embodiment is that the check valve 49 of the check valve 49 according to the fourth embodiment is replaced by a hemispherical shape. There is a poppet valve body made of resin having a head. In this embodiment, the same components as those in the above-described fourth embodiment are designated by the same reference numerals, and the description thereof will be omitted. Further, in this embodiment, only one check valve is shown.

In the figure, reference numeral 61 denotes a check valve, which is formed at the connecting portion between the inflow side ventilation passage 45 and the bypass passage 48 and has a pin insertion hole 45 in the bypass passage 48.
A valve body accommodating portion 62 which is located on the B side and has a large diameter, and a connecting portion between the inflow passage 45A and the pin insertion hole 45B is the one side valve seat 62A and the other side is the other side valve seat 62B, and the valve body A resin poppet valve body 6 movably arranged in the accommodating portion 62.
And 3.

Here, the poppet valve body 63 is formed in a cylindrical shape having a hemispherical head portion 63A, and the head portion 63A of the poppet valve body 63 is arranged so as to face the inflow passage 45A side. .

Even in the check valve 61 thus constructed, the bypass passage 48 has a negative pressure when the patient inhales air from the suction port, as in the fourth embodiment. As shown by the arrow A in FIG. 16, the poppet valve element 63 in the valve element accommodating portion 62 immediately seats on the other side valve seat 62B to open each inflow side air passage 45 to guide the capsule insertion guide. Allow air from 42 to flow into capsule K. At this time, since the poppet valve body 63 does not exist in the middle of the inflow side air passage 45, the check valve 61 is prevented from becoming an air resistance at the time of medication, and the prescribed amount of the medicinal powder in the capsule K is prevented. Can be dosed.

On the other hand, when the patient coughs while holding the inhalation port and blows air into the inhalation passage of the inhalation port to make it flow backward, as shown by arrow B in FIG. Immediately move the poppet valve element 63 toward one side,
The head 63A of the poppet valve body 63 is seated on the one-side valve seat 62A, the check valve 61 is closed, and the pocket valve body 63 is closed.
This closes the space between the inflow passage 45A and the pin insertion hole 45B. Then, it is possible to prevent the air flowing into the inflow passage 45A via the capsule K from being discharged to the atmosphere side.

Moreover, before the air passing through the capsule K reaches the check valve 61, the check valve 61 can be closed by the air flow from the bypass passage 48. The drug is never discharged to the atmosphere, and a prescribed amount of drug powder can be administered to the patient.

In each of the above embodiments, the capsule K is inserted into the capsule housing chamber 11 (24, 44) and the holes K, H, ... Although the description has been given by taking as an example a drug dispenser for inhaling the medicinal powder therein, a medicinal powder containing chamber is provided in place of the capsule containing chamber, and the medicinal powder for one dose is distributed to the medicinal powder containing chamber. It may be applied to a medication device designed to be inhaled.

[0085]

As described in detail above, claims 1 and 2
According to the invention, since the check valve is provided in the middle of the inflow side air passage, when the patient coughs while holding the suction port and causes air to flow back into the suction port, the check valve is closed. The valve can be closed to block the inflow side air passage, and this backflowing air is prevented from flowing into the inflow side air passage and releasing the drug powder in the drug powder storage chamber (capsule storage chamber) to the atmosphere side. You can
A prescribed amount of medicinal powder can be administered to a patient while preventing the medicinal powder in the capsule K from decreasing.

In the structure of the check valve according to the third to fifth aspects of the present invention, when the air is sucked, the valve body is separated from the valve seat of the valve body accommodating portion and opened to open the drug powder accommodating chamber or the capsule accommodating chamber. The air is allowed to be supplied from the atmosphere side through the inflow side air passage to the patient, and the drug powder in the drug powder storage chamber or the capsule stored in the capsule storage chamber is inhaled by the patient by the supplied air. It can be released into the lungs and administered as a medicinal powder. On the other hand, when the patient coughs with the mouth held and causes the air to flow back, the check valve closes and closes the inflow side air passage, so this backflowing air flows into the inflow side air passage. As a result, it is possible to prevent the drug powder in the capsule housed in the drug powder storage chamber or the capsule storage chamber from being discharged to the atmosphere side, and to administer a prescribed amount of the drug powder.

According to the sixth and seventh aspects of the invention, a bypass passage bypassing the drug powder storage chamber (capsule storage chamber) is formed, and the valve body of the check valve is moved through the bypass passage. Therefore, if the patient coughs while holding the inhaler and causes air to flow back into the inhaler,
Since the backflow prevention valve is closed by the air flowing through the bypass passage to close the inflow side air passage, the backflowing air flows into the inflow side air passage and is stored in the drug powder storage chamber (capsule storage chamber). It is possible to prevent the drug powder inside from being released to the atmosphere side. Moreover, since the air flowing through the bypass passage flows faster than the air passing through the drug powder storage chamber (capsule storage chamber), before the air flows into the inflow side air passage through the drug powder storage chamber (capsule storage chamber) during backflow. In addition, the check valve can be closed, and the chemical powder can be reliably prevented from being discharged to the atmosphere side.

In the structure of the check valve according to the eighth aspect of the present invention, when the air is sucked, the valve body is seated on the other side valve seat of the valve body accommodating portion to close the bypass passage and open the inflow side ventilation passage. To allow air to be supplied from the atmosphere side to the drug powder storage chamber or the capsule storage chamber via the inflow side air passage, and the capsules stored in the drug powder storage chamber or the capsule storage chamber by the supplied air. The medicinal powder therein can be released into the lungs of the patient via the inhalation port, and the medicinal powder can be administered. On the other hand, when the patient coughs and reverses the air while holding the suction port, the valve seats on the valve seat on one side of the valve housing part, closes the inflow side air passage, and stores the drug powder. It is possible to prevent the medicinal powder located in the chamber or the capsule housing chamber from being released to the atmosphere side, and to administer a prescribed amount of medicinal powder.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an inhalation-type medication device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view as seen from the direction of arrows II-II in FIG.

FIG. 3 is a vertical cross-sectional view showing a state in which drug powder is administered by a suction operation, as viewed from the same position as in FIG.

FIG. 4 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is opened by sucked air.

FIG. 5 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is closed by backflowing air.

FIG. 6 is a longitudinal cross-sectional view of essential parts showing the vicinity of the capsule holder of the inhalation-type medication device according to the second embodiment of the present invention.

FIG. 7 is a cross-sectional view as seen from the direction of arrows VII-VII in FIG.

FIG. 8 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is opened by sucked air.

FIG. 9 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is closed by air flowing backward.

FIG. 10 is an enlarged sectional view of an essential part showing a state in which a check valve according to a third embodiment of the present invention is opened by sucked air.

11 is a cross-sectional view as seen from the direction of the arrows XI-XI in FIG.

FIG. 12 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is closed by backflowing air.

FIG. 13 is a longitudinal cross-sectional view of essential parts showing the vicinity of the capsule holder of the inhalation-type medication device according to the fourth example of the present invention.

FIG. 14 is an enlarged sectional view of an essential part showing a state in which a check valve is opened by sucked air.

FIG. 15 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is closed by backflowing air.

FIG. 16 is an enlarged sectional view of an essential part showing a state in which a check valve according to a fifth embodiment of the present invention is opened by sucked air.

FIG. 17 is an enlarged cross-sectional view of an essential part showing a state in which a check valve is closed by air flowing backward.

[Explanation of symbols]

 8,21,41 Capsule holder 11,24,44 Capsule storage chamber 12,25,45 Inflow side ventilation passage 13,26,46 Outflow side ventilation passage 15 Flap valve (backflow prevention valve) 28,31,49,61 Backflow prevention Valve 29, 32, 50, 62 Valve body accommodating part 30, 33, 51 Ball valve body 48 Bypass passage 63 Poppet valve body

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazunori Ishiseki 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisia Gex Co., Ltd. (72) Inventor Akira Yanagawa 5-3 Fujimigaoka, Tsuzuki-ku, Yokohama, Kanagawa

Claims (8)

[Claims] 1. A drug dispenser main body having one side in the axial direction as a drug powder storage chamber and the other side serving as a suction port for inhaling the drug powder, and air for supplying air to the drug powder storage chamber of the drug dispenser main body. Side and the inflow side air passage that connects the drug powder storage chamber and the drug powder in the drug powder storage chamber of the drug dispenser main body to the intake port side, so that the drug powder storage chamber and the intake port communicate with each other. From an outflow side air passage and a backflow prevention valve provided in the middle of the inflow side air passage to shut off air that flows back from the chemical powder storage chamber to the atmosphere side when a backflow occurs from the suction port. An inhalation-type medication device configured. 2. A medication container main body having one side in the axial direction as a capsule housing chamber for containing a capsule filled with medicinal powder, and the other side serving as an intake port for inhaling the medicinal powder, and a capsule of the medication device main body. In order to supply air into the capsule housed in the housing chamber, the inflow side air passage communicating between the atmosphere side and the capsule housing chamber and the medicinal powder in the capsule housed in the capsule housing chamber of the drug dispenser body are provided. In order to supply to the suction port side, provided in the main body of the medicine dispenser, in order to make an outflow side air passage connecting the capsule housing chamber and the suction port, and a hole communicating with each air passage in the capsule in the capsule housing chamber. And a backflow prevention valve provided in the middle of the inflow side ventilation passage for blocking the air flowing back to the atmosphere side from the chemical powder storage chamber when a backflow occurs from the suction port. An inhalation-type medication device configured. 3. The check valve is rotatably provided in an inflow side air passage, and opens when air is sucked in from the suction port and inflow side air when the air is blown out to the suction port. 3. The inhalation-type medication device according to claim 1, which is formed as a flap valve that closes a passage. 4. The large-diameter valve body accommodating portion, wherein the check valve is formed in the middle of the inflow side air passage, one side is a valve seat and the other side is a valve body receiver, and the check valve moves into the valve body accommodating portion. And a valve body that is provided so that the valve body opens when air is sucked in from the suction port and closes the inflow side air passage when air is blown out to the suction port. The inhalation-type medication device according to claim 1 or 2. 5. The large-diameter valve body accommodating valve, wherein the check valve is formed in the middle of an inflow side air passage, one side is a valve seat and the other side is a valve body receiver, and an air escape groove is provided on the outer periphery of the valve body receiver. And a valve body movably provided in the valve body accommodating portion, the valve body opens when air is sucked from the suction port, and when the air is blown to the suction port, the valve body is opened. The inhalation-type medication device according to claim 1 or 2, wherein the inflow side air passage is closed. 6. A drug dispenser body having one side in the axial direction as a drug powder storage chamber and the other side serving as an intake port for inhaling the drug powder, and air for supplying air to the drug powder storage chamber of the drug dispenser body, the atmosphere. Side and the inflow side air passage that connects the drug powder storage chamber and the drug powder in the drug powder storage chamber of the drug dispenser main body to the intake port side, so that the drug powder storage chamber and the intake port communicate with each other. An outflow side air passage, a bypass passage formed between the inflow side air passage and the outflow side air passage to bypass the chemical powder storage chamber, and when a backflow occurs from the suction port, An inhalation-type medication device comprising a backflow prevention valve provided between the inflow side ventilation passage and the bypass passage for blocking air that flows backward from the drug powder storage chamber to the atmosphere side. 7. A drug dispenser main body having one side in the axial direction as a capsule housing chamber for containing a capsule filled with drug powder inside and another side serving as an intake port for inhaling drug powder, and a capsule of the drug dispenser body. In order to supply air into the capsule housed in the housing chamber, the inflow side air passage that connects the atmosphere side and the capsule housing chamber, and the drug powder in the capsule housed in the capsule housing chamber of the drug dispenser body are In order to supply to the suction port side, an outflow side air passage that connects the capsule storage chamber and the suction port,
A bypass passage formed between the inflow side air passage and the outflow side air passage to bypass the capsule storage chamber, and when a backflow occurs from the suction port, the chemical powder storage chamber is opened to the atmosphere side. An inhalation-type medication device comprising a backflow prevention valve provided between the inflow side air passage and the bypass passage for blocking air flowing back into the inflow side. 8. The check valve is formed at a connection position between the inflow side ventilation passage and the bypass passage, and one side serves as a one-side valve seat for closing the inflow side ventilation passage and the other side closes the bypass passage. It is composed of a large-diameter valve body accommodating portion serving as the other side valve seat and a valve body movably provided in the valve body accommodating portion. Sit on the side valve seat to close the bypass passage while opening the inflow side air passage, and when air is blown out to the intake port, the air flowing through the bypass passage is seated on the one side valve seat to inflow the inflow side The inhalation-type medication device according to claim 6 or 7, wherein the passage is closed.