CN114191656A - Drug delivery device and drug delivery method - Google Patents

Abstract

The invention relates to a drug delivery device and a drug delivery method, wherein the drug delivery device comprises a barrel body (1) and a push rod (2), the barrel body (1) is provided with a first port (101), a second port (102) and a containing cavity (15) communicated with the first port (101) and the second port (102), the first port (101) is used for enabling drugs to flow out, the push rod (2) is slidably jointed on the inner surface of the containing cavity (15) through the second port (102), the push rod (2) is provided with a first blocking part (231), the first blocking part (231) has a blocking state and a withdrawing state, and in the blocking state, the first blocking part (231) is in contact with the end surface of the second port to prevent the push rod (2) from sliding relative to the barrel body (1); in the retracted state, the push rod (2) is reduced to a size that can pass through the second port to allow the push rod (2) to continue to slide. The invention can realize accurate quantitative administration twice continuously.

Description

Drug delivery device and drug delivery method

Technical Field

The invention relates to the technical field of drug delivery instruments, in particular to a drug delivery device and a drug delivery method.

Background

The syringe is a device widely used in the fields of medical treatment and the like, and the principle of the syringe is that liquid is sucked and then discharged through a pintle connector. The outer wall of an injection tube of a conventional injector is provided with a measuring ruler, medical staff determines the injection amount of each time by using the measuring ruler, then a piston handle on a piston rod is used for pushing a piston, and a rubber pushing head on the outer edge of the piston pushes liquid medicine in the injection tube into a human body through a needle head.

However, in some special cases, it may be necessary to inject the medicament into a certain part of the human body with great precision. For example, in the treatment of certain diseases of the nasal cavity, it is often necessary to dose a quantity of liquid medicine into the nostril. There are also diseases outside the nasal cavity, and it is also necessary to spray the corresponding medicine in the nasal cavity in a quantitative manner so as to make the medicine inhaled into the body from the nasal cavity. However, the accuracy of conventional syringes is generally difficult to meet injection requirements.

It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Disclosure of Invention

Embodiments of the present invention provide a drug delivery device and a drug delivery method that can effectively improve the accuracy of a dose.

According to a first aspect of the present invention there is provided a drug delivery device comprising:

the drug delivery device comprises a barrel body, a first valve, a second valve and a first valve, wherein the barrel body is provided with a first port, a second port and an accommodating cavity communicated with the first port and the second port, the first port is used for enabling drugs to flow out, and a first limiting part is arranged in the accommodating cavity; and

the push rod is slidably jointed on the inner surface of the accommodating cavity through the second port and is provided with a first blocking part, the first blocking part has a blocking state and a withdrawing state, and in the blocking state, the first blocking part is in contact with the end surface of the second port so as to prevent the push rod from sliding relative to the cylinder body; in the retracted state, the push rod is reduced to a size that can pass through the second port to allow the push rod to continue to slide.

In some embodiments, the push rod comprises a pushing part, a push rod body and an operable rod, the push rod body and the operable rod are respectively connected with the pushing part, the first blocking part is arranged on the operable rod, and in a blocking state, a gap is formed between the push rod body and the operable rod, so that the first blocking part abuts against the end face of the second port; in a withdrawing state, the first blocking part inclines towards the direction close to the push rod body, so that the push rod is reduced to the size capable of penetrating through the second port.

In some embodiments, the operable rod is provided with a recess portion, the recess portion is located on one side of the first blocking portion close to the pushing portion, and the recess portion is pressed to drive the operable rod to incline towards the direction close to the push rod body.

In some embodiments, the push rod body is provided with a groove, and the operable rod is pressed to enable one end of the first blocking part close to the push rod body to be embedded into the groove.

In some embodiments, an interference fit is formed between one end of the first blocking portion close to the push rod body and the groove.

In some embodiments, the drug delivery device further comprises a retaining structure configured to retain an end of the first blocking portion proximate to the push rod body in the recess.

In some embodiments, the retaining structure includes a first hook disposed at an end of the first blocking portion close to the push rod body and a second hook disposed at an inner wall of the groove, and the first hook and the second hook are hooked.

In some embodiments, the operable lever is provided with a projection on a side of the first blocking portion adjacent to the pushing portion.

In some embodiments, a first groove is arranged between the first blocking portion and the protruding portion, and a second groove is arranged on the side face, far away from the first blocking portion, of the protruding portion.

In some embodiments, a first limiting portion is disposed in the accommodating cavity, and the push rod is provided with a second limiting portion, wherein the second limiting portion contacts with the first limiting portion to prevent the push rod from sliding relative to the barrel.

In some embodiments, the accommodating cavity has a first accommodating part with a larger cross-sectional area and a second accommodating part with a smaller cross-sectional area, and a transition part between the first accommodating part and the second accommodating part forms a first limiting part.

In some embodiments, the drug delivery device further comprises a sealing plug, the sealing plug is mounted at the end of the push rod, the sealing plug is tightly matched with the inner surface of the accommodating cavity, a second limiting part is arranged in the accommodating cavity, and a third limiting part matched with the second limiting part is arranged on the outer surface of the sealing plug.

In some embodiments, the sealing plug includes a plug body and a tail portion extending from the plug body, the barrel includes a mounting portion for mounting the needle, and the tail portion has a length greater than a length of the mounting portion.

According to a second aspect of the present invention, there is provided a method of administering a drug based on the above drug delivery device, comprising:

when the first blocking part is in a first state, the push rod is pushed to slide relative to the cylinder body, and when the first blocking part is contacted with the end face of the second port, the first administration is finished;

and the state of the first blocking part is switched to a second state, and the push rod is continuously pushed to slide relative to the barrel until the second administration is completed.

In some embodiments, switching the state of the first blocking portion to the second state comprises:

and pressing the first blocking part to reduce the size of the push rod so that the push rod can pass through the second port.

Based on the technical scheme, the push rod is provided with the first blocking part, the first blocking part has two states, when the first blocking part is in the blocking state, the first blocking part can be contacted with the end face of the second port of the barrel body in the sliding process of the push rod relative to the barrel body, so that the push rod is prevented from continuously moving, the first medicine administration is realized, and in the first medicine administration process, the push rod stops moving through the mutual contact of the first blocking part and the end face of the second port of the barrel body, so that the medicine administration amount can be accurately controlled, and the medicine administration accuracy is effectively improved; when the first blocking part is in a withdrawing state, the size of the push rod can be reduced after the first blocking part is withdrawn, so that the push rod can penetrate through the second port and enter the accommodating cavity, namely, the push rod can continuously slide relative to the barrel to finish secondary administration, and the drug delivery device is suitable for a scene needing at least twice administration.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic view of the cartridge in an embodiment of the drug delivery device according to the invention.

Fig. 2 is a front view of a cartridge in an embodiment of a drug delivery device according to the invention.

Fig. 3 is a cross-sectional view of the cartridge taken along section a-a in the embodiment of fig. 2.

Fig. 4 is a schematic view of a push rod in an embodiment of a drug delivery device according to the invention.

Fig. 5 is a front view of a push rod in an embodiment of a drug delivery device according to the invention.

Fig. 6 is a cross-sectional view of the cartridge taken along section B-B in the embodiment of fig. 5.

Fig. 7 is a schematic view of a sealing plug in an embodiment of the drug delivery device according to the invention.

In the figure:

1. a barrel; 2. a push rod; 3. a sealing plug;

11. an installation part; 12. a first barrel portion; 13. a second barrel portion; 14. a hand-held portion; 15. An accommodating chamber; 151. a third accommodating portion; 152. a second accommodating portion; 153. a first accommodating portion; 154. A first limiting part; 16. a second limiting part; 101. a first port; 102. a second port;

21. a pressing section; 22. a push rod body; 221. a first push rod body; 222. a second blocking portion; 223. a second push rod body; 224. a groove; 225. a second hook; 23. an operable lever; 231. a first blocking portion; 232. a recessed portion; 233. a first hook; 234. a boss portion; 235. A first trench; 236. a second trench; 24. a club head; 25. a gap;

31. a plug body; 311. a third limiting part; 32. and a tail portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.

Referring to fig. 1 to 6, in some embodiments of the drug delivery device provided by the present invention, the drug delivery device comprises a barrel 1 and a push rod 2, the barrel 1 is provided with a first port 101, a second port 102 and a housing cavity 15 communicating with the first port 101 and the second port 102, the first port 101 is used for flowing out the drug, the push rod 2 is slidably engaged with the inner surface of the housing cavity 15 through the second port 102, the push rod 2 is provided with a first blocking part 231, the first blocking part 231 has a blocking state and a retracted state, in the blocking state, the first blocking part 231 is in contact with the end surface of the second port to prevent the push rod 2 from sliding relative to the barrel 1; in the retracted state, the push rod 2 is reduced to a size that can pass through the second port to allow the push rod 2 to continue sliding.

In the above embodiment, the first blocking portion 231 is disposed on the push rod 2, and the first blocking portion 231 has two states, when the first blocking portion 231 is in the blocking state, the first blocking portion 231 contacts with the end surface of the second port 102 of the cylinder 1 in the process that the push rod 2 slides relative to the cylinder 1, so as to prevent the push rod 2 from continuing to move, and realize the first drug administration, and in the first drug administration process, the push rod 2 stops moving through the mutual contact of the first blocking portion 231 and the end surface of the second port 102 of the cylinder 1, so that the drug administration amount can be precisely controlled, and the drug administration accuracy is effectively improved.

When the first blocking part 231 is in the retracted state, the size of the push rod 2 can be reduced after the first blocking part 231 is retracted, so that the push rod 2 can pass through the second port 102 and enter the accommodating cavity 15, that is, the push rod 2 can continuously slide relative to the cylinder 1, and the second administration is completed. For some scenes that the medicine needs to be administered to the same patient at least twice, the medicine administration device provided by the invention can realize continuous twice administration without replacing a new medicine administration device during the second time administration, thereby avoiding the waste of resources.

In some embodiments, the push rod 2 includes a pushing portion 21, a push rod body 22 and an operable rod 23, the push rod body 22 and the operable rod 23 are respectively connected to the pushing portion 21, the first blocking portion 231 is disposed on the operable rod 23, and in the blocking state, a gap 25 is formed between the push rod body 22 and the operable rod 23, so that the first blocking portion 231 abuts against the end surface of the second port 102; in the retracted state, the first stopper 231 is inclined in a direction approaching the push rod body 22, thereby reducing the push rod 2 to a size capable of passing through the second port 102.

When the first blocking portion 231 is in the blocking state, a gap 25 is formed between the push rod body 22 and the operable rod 23, and the gap makes the first blocking portion 231 relatively far away from the push rod body 22, so that the size of the push rod 2 is large, and when the push rod 2 slides to the end surface of the second port 102, the first blocking portion 231 abuts against the end surface of the second port 102, so that the push rod 2 stops moving, and the first administration is completed.

When the first blocking portion 231 is in the retracted state, the first blocking portion 231 is inclined toward the direction approaching the push rod body 22, so as to reduce the size of the gap 25 between the push rod body 22 and the operable rod 23, and further reduce the size of the push rod 2, so that the push rod 2 can pass through the second port 102 and enter the accommodating cavity 15, i.e. the push rod 2 can continue to slide, and continuous drug delivery is realized.

In some embodiments, the operable lever 23 may be a spring or other retractable member.

In some embodiments, the operable lever 23 is provided with a recessed portion 232, the recessed portion 232 is located on a side of the first blocking portion 231 close to the pushing portion 21, and the recessed portion 232 is pressed to tilt the operable lever 23 to a direction close to the push rod body 22.

By providing the recessed portion 232, a point of application can be provided for a user to press the operable lever 23, facilitating the operation. The recess 232 may be provided in an arc shape similar to the shape of a human finger for easy manipulation.

In some embodiments, the plunger body 22 is provided with a groove 224, and the operable lever 23 is pressed to insert an end of the first blocking portion 231 adjacent to the plunger body 22 into the groove 224.

By providing the groove 224, an end of the first stopper 231 near the push rod body 22 can be fitted into the groove 224. The groove 224 provides an accommodation space for an end of the first blocking portion 231 near the push rod body 22.

The shape of the groove 224 may match the shape of the end of the first stopper 231 near the pushrod body 22.

In some embodiments, an interference fit is formed between an end of the first blocking portion 231 close to the push rod body 22 and the groove 224. The advantage of this arrangement is that after the end of the first blocking portion 231 close to the push rod body 22 is inserted into the groove 224, the end of the first blocking portion 231 close to the push rod body 22 can be prevented from being separated from the groove 224, and the first blocking portion 231 is prevented from rebounding to affect the sliding of the push rod 2 during the use process. In addition, the end of the first blocking part 231 close to the push rod body 22 is prevented from being separated from the groove 224, and the reuse of the drug delivery device can be effectively prevented.

In some embodiments, the drug delivery device further comprises a retaining structure configured to retain an end of the first blocking portion 231 proximal to the push rod body 22 in the groove 224.

By arranging the retaining structure, one end of the first blocking part 231 close to the push rod body 22 can be retained in the groove 224, the one end of the first blocking part 231 close to the push rod body 22 is prevented from being separated from the groove 224, the first blocking part 231 is prevented from rebounding to influence the sliding of the push rod 2 in the using process, and the reuse of the drug delivery device can also be prevented.

In some embodiments, the holding structure includes a first hook 233 disposed at one end of the first blocking portion 231 near the putter body 22 and a second hook 225 disposed at an inner wall of the groove, and the first hook 233 and the second hook 225 are hooked. The first stopper 231 is prevented from being separated from the groove 224 by the first and second hooks 233 and 225.

In some embodiments, the operable lever 23 is provided with a projection 234 on a side of the first blocking portion 231 adjacent to the pushing portion 21. The projection 234 projects from a side of the operable lever 23 close to the plunger body 22 in a direction away from the plunger body 22. By providing the projection 234, the structural strength of the operable lever 23 can be improved.

In some embodiments, a first groove 235 is disposed between the first blocking portion 231 and the protruding portion 234, and a second groove 236 is disposed on a side of the protruding portion 234 away from the first blocking portion 231.

By providing the first groove 235 and the second groove 236, the operable lever 23 can be more easily deformed when pressed, enhancing the deformability of the operable lever 23.

In some embodiments, a first limiting portion 154 is disposed in the accommodating cavity 15, the push rod 2 is provided with a second limiting portion 222, and the second limiting portion 222 contacts with the first limiting portion 154 to prevent the push rod 2 from sliding relative to the barrel 1.

Through setting up first spacing portion 154 and second stopper 222, can block push rod 2 through the contact of first spacing portion 154 and second stopper 222 when dosing for the second time, realize the accurate control of dosing for the second time, improve the accuracy of dosing for the second time.

In some embodiments, the accommodating chamber 15 has a first accommodating portion 153 with a larger cross-sectional area and a second accommodating portion 152 with a smaller cross-sectional area, and a transition portion between the first accommodating portion 153 and the second accommodating portion 152 forms a first limiting portion 154. The first stopper portion 154 is formed by a change in the size of the accommodation chamber 15.

As shown in fig. 7, in some embodiments, the drug delivery device further includes a sealing plug 3, the sealing plug 3 is mounted on the end portion of the push rod 2, the sealing plug 3 is tightly fitted with the inner surface of the accommodating cavity 15, a second stopper portion 16 is disposed in the accommodating cavity 15, and a third stopper portion 311 fitted with the second stopper portion 16 is disposed on the outer surface of the sealing plug 3.

By providing the sealing plug 3, a sealing fit with the inner surface of the receiving cavity 15 can be achieved, and leakage of liquid can be prevented. Can also scrape the medicine of adhesion at the internal surface that holds chamber 15 clean when dosing through sealing plug 3, avoid the medicine to remain, effectively improve the accuracy of dose.

By arranging the second limiting part 16 and the third limiting part 311, when medicine is extracted or pushed, certain resistance can be formed on the movement of the push rod 2 through the matching of the second limiting part 16 and the third limiting part 311, and prompt information about the movement position of the push rod 2 is provided for a user.

For example, by providing the second limiting portion 16 and the third limiting portion 311, the amount of the medicine sucked by the medicine delivery device before medicine delivery can be taken as a mark of a preset value, for example, when the second limiting portion 16 and the third limiting portion 311 contact and pull the push rod 2 to receive resistance, the amount of the medicine sucked by the medicine is represented to meet a preset requirement, and at this time, the user can stop sucking the medicine.

The second position-limiting portion 16 may be an annular structure or one or more convex strips independently arranged along the circumferential direction. The third limiting portion 311 may also be an annular structure or one or more convex strips independently arranged along the circumferential direction.

In some embodiments, the sealing plug 3 has elasticity, which is beneficial to achieve a tight fit with the inner surface of the accommodating cavity 15, and also enables the second limiting portion 16 and the third limiting portion 311 to overcome the resistance of the second limiting portion 16 and the third limiting portion 311 to the push rod 2 by applying a larger external force after the second limiting portion 16 and the third limiting portion 311 are contacted, so as to prevent the second limiting portion 16 and the third limiting portion 311 from completely preventing the movement of the push rod 2.

In some embodiments, the sealing plug 3 is made of a rubber material.

In some embodiments, the drug delivery device further comprises a needle or guard plug removably attached to the barrel 1 at the first port 101, the needle being used to inject a liquid to a predetermined site, and the guard plug being supportable in a nasal cavity or the like.

In some embodiments, the sealing plug 3 comprises a plug body 31 and a tail portion 32 extending from the plug body 31, the barrel 1 comprises a mounting portion 11 for mounting a needle, and the length of the tail portion 32 is greater than the length of the mounting portion 11. The arrangement can push all the medicines in the mounting part 11 out through the tail part 32, and medicine residue is avoided.

Based on the drug delivery device in each of the above embodiments, the present invention also provides a drug delivery method, including:

when the first blocking part 231 is in the first state, the push rod 2 is pushed to slide relative to the cylinder 1, and when the first blocking part 231 is contacted with the end face of the second port 102, the first administration is finished; and

the state of the first blocking part 231 is switched to the second state, and the push rod 2 is continuously pushed to slide relative to the cylinder 1 until the second administration is completed.

In some embodiments, switching the state of the first barrier 231 to the second state includes:

the first stopper 231 is pressed to reduce the size of the push rod 2 so that the push rod 2 can pass through the second port 102.

In some embodiments, before pushing the push rod 2 to slide relative to the barrel 1, the method of administering the drug further comprises:

the push rod 2 is slidably engaged with the inner surface of the accommodating chamber 15 through the second port 102.

The positive technical effects of the drug delivery device in the various embodiments described above are equally applicable to the method of drug delivery and will not be described in detail here.

The administration device and the administration method provided by the invention can be suitable for liquid medicines, powdery solid medicines or solid-liquid mixed medicines, can be suitable for being injected into a human body, and can also be suitable for being sprayed to certain parts of the human body.

The structure and operation of one embodiment of the drug delivery device of the present invention will now be described with reference to figures 1 to 7 of the accompanying drawings:

as shown in fig. 1 to 3, the cylinder 1 has a cylindrical structure, the cylinder 1 has a stepped structure, the cylinder 1 includes a mounting portion 11, a first cylinder portion 12, a second cylinder portion 13, and a holding portion 14, the mounting portion 11 has a diameter smaller than that of the first cylinder portion 12, and the first cylinder portion 12 has a diameter smaller than that of the second cylinder portion 13. The hand-held portion 14 is attached to an end of the second barrel portion 13 remote from the first barrel portion 12.

The accommodating cavity 15 is arranged inside the barrel 1, the accommodating cavity 15 comprises a third accommodating part 151, a second accommodating part 152 and a first accommodating part 153, the third accommodating part 151 is arranged inside the mounting part 11, the second accommodating part 152 is arranged inside the first barrel part 12, and the first accommodating part 153 is arranged inside the second barrel part 13. The third receiving portion 151 has a diameter smaller than that of the second receiving portion 152, and the second receiving portion 152 has a diameter smaller than that of the first receiving portion 153. The second receiving portion 152 is used to store medicine, and the second receiving portion 152 and the first receiving portion 153 are used to receive the push rod 2. The diameter change of the second receiving portion 152 and the first receiving portion 153 forms a first stopper portion 154.

The end of the third housing 151 remote from the second housing 152 forms the first port 101 of the cylinder 1, the first housing 153 extends to the end of the handle 14 remote from the second cylinder 13, and the end of the first housing 153 remote from the second housing 152 forms the second port 102 of the cylinder 1. An end face of the hand grip portion 14 at an end remote from the second cylinder portion 13 forms an end face of the second port 102.

The second position-limiting portion 16 is disposed in the second accommodating portion 152 and is close to the third accommodating portion 151. The second stopper portion 16 may be provided at a position capable of storing a dose required for two administrations.

As shown in fig. 4 to 6, the putter 2 includes a pressing portion 21, a putter body 22, an operable lever 23, and a putter head 24, and the putter body 22 and the operable lever 23 are integrally connected to the pressing portion 21, respectively. The pressing portion 21 has a flat plate structure. The head 24 is connected to one end of the putter body 22 remote from the pressing portion 21.

The push rod body 22 includes a first push rod body 221, a second stopper 222, and a second push rod body 223, and a cross-sectional area of the second stopper 222 is larger than a cross-sectional area of the first push rod body 221. The length of the first push rod body 221 is substantially equal to the length of the second receiving portion 152.

The first push rod body 221 comprises 4 extension rods connected with each other, an included angle of 90 degrees is formed between any two adjacent extension rods, and the cross section of the first push rod body 221 in the direction perpendicular to the axis of the push rod 2 is in a cross shape. The second barrier 222 may be a circular plate type structure.

The second push rod body 223 and the operable lever 23 are integrally connected to the pressing portion 21, respectively. The length of the second push rod body 223 is greater than the length of the operable lever 23. There is a gap 25 between the second pushrod body 223 and the operable lever 23 in a direction perpendicular to the length direction of the pushrod 2.

A groove 224 is formed at a position of the second push rod body 223 adjacent to the second blocking portion 222, and a second hook 225 is formed on an inner wall of the groove 224.

There is a gap between the operable lever 23 and the second stopper 222. The first stopper 231 is located at an end of the operable lever 23 near the second stopper 222. A first hook 233 is provided at an end of the first blocking portion 231, which is adjacent to the second push rod body 223.

The operable lever 23 is further provided with a recessed portion 232, and the recessed portion 232 is located on a side of the first blocking portion 231 close to the pushing portion 21. A protruding part 234 is arranged between the recessed part 232 and the first blocking part 231, a first groove 235 is arranged between the protruding part 234 and the first blocking part 231, and a second groove 236 is arranged between the protruding part 234 and the recessed part 232.

The second putter body 223 and the operable lever 23 may be both of a long bar plate type structure, and both sides of the operable lever 23 may be provided with recesses 232, respectively.

As shown in fig. 7, the sealing plug 3 includes a plug body 31 and a tail portion 32, and the plug body 31 is provided with a third stopper 311. The sealing plug 3 is mounted on the stem head 24. After the plunger 2 is inserted into the receiving cavity 15, the sealing plug 3 is located in the second receiving portion 152, and the tail portion 32 is located in the third receiving portion 151. The tail portion 32 has a diameter smaller than that of the third accommodation portion 151. The length of the tail part 32 is greater than that of the third accommodating part 151, so that all the medicine in the accommodating cavity 15 can be pushed out by the push rod 2, and medicine residue is avoided.

The administration device in this example is used (taking liquid medication into the nasal cavity as an example):

connecting a detachable needle head to the mounting part 11 of the barrel body 1 of the drug delivery device, and sucking the liquid medicine from the medicine bottle to the position where the third limiting part 311 on the sealing plug 3 is in contact with the second limiting part 16 on the barrel body 1; then, the needle of the mounting part 11 is replaced by a nasal cavity protective plug body, the push rod 2 is pushed to carry out first dosing, and when the first blocking part 231 of the push rod 2 abuts against the end face of the second port 102 of the barrel body 1, first dosing is finished; then, the finger touches the concave portion 232 and presses to incline the operable lever 23 toward the second plunger body 223, so that the end of the first blocking portion 231 close to the second plunger body 223 is inserted into the groove 224, and the first hook 233 and the second hook 225 are hooked, and then the plunger 2 is pushed continuously until the liquid medicine is completely extruded, thereby completing the second dosing.

When the drug delivery device is used for drug delivery, the thumb of the right hand can be used for abutting against the pushing part 21, the index finger and the middle finger are placed at the handheld part 14 at the rear end of the barrel body 1, the thumb and the index finger of the left hand are respectively placed at the concave parts 232 at the two sides, the thumb of the right hand pushes the push rod 2 for drug delivery, and slow and accurate drug delivery can be achieved.

Through the description of the embodiment of the drug delivery device, the embodiment of the drug delivery device can realize accurate dosing twice continuously, the accuracy of the dose is high, and the operation is convenient.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.

Claims (15)

1. A drug delivery device, comprising:

a barrel (1) provided with a first port (101), a second port (102) and a containing cavity (15) communicated with the first port (101) and the second port (102), wherein the first port (101) is used for enabling medicine to flow out; and

a push rod (2) slidably engaged with an inner surface of the housing chamber (15) through the second port (102), the push rod (2) being provided with a first stopper (231), the first stopper (231) having a blocking state in which the first stopper (231) is in contact with an end surface of the second port to prevent the push rod (2) from sliding relative to the barrel (1) and a retracted state; in the retracted state, the push rod (2) is reduced to a size that can pass through the second port to continue sliding the push rod (2).

2. The drug delivery device according to claim 1, wherein the push rod (2) comprises a push part (21), a push rod body (22) and an operable rod (23), the push rod body (22) and the operable rod (23) are respectively connected with the push part (21), the first blocking part (231) is arranged on the operable rod (23), and in the blocking state, a gap (25) is formed between the push rod body (22) and the operable rod (23) so that the first blocking part (231) abuts against the end surface of the second port (102); in the retracted state, the first stopper (231) is inclined in a direction approaching the push rod body (22), thereby reducing the push rod (2) to a size capable of passing through the second port (102).

3. The drug delivery device according to claim 2, wherein the operable lever (23) is provided with a recess (232), the recess (232) is located on a side of the first blocking portion (231) close to the pushing portion (21), and the recess (232) is pressed to tilt the operable lever (23) in a direction close to the push rod body (22).

4. The medication delivery device according to claim 2, wherein the push rod body (22) is provided with a groove (224), and the operable lever (23) is pressed to cause an end of the first blocking portion (231) adjacent to the push rod body (22) to be inserted into the groove (224).

5. The drug delivery device according to claim 4, wherein an interference fit is formed between one end of the first blocking portion (231) close to the push rod body (22) and the groove (224).

6. The drug delivery device of claim 4, further comprising a retaining structure configured to retain an end of the first stop (231) proximate the pushrod body (22) in the groove (224).

7. The drug delivery device according to claim 6, wherein the retaining structure comprises a first hook (233) disposed at one end of the first blocking portion (231) near the push rod body (22) and a second hook (225) disposed at an inner wall of the groove, and the first hook (233) and the second hook (225) are in hooking connection.

8. The medication delivery device according to claim 2, wherein the operable lever (23) is provided with a projection (234) on a side of the first blocking portion (231) adjacent to the pushing portion (21).

9. The drug delivery device according to claim 8, characterized in that a first groove (235) is provided between the first stop (231) and the protrusion (234), and a second groove (236) is provided on the side of the protrusion (234) remote from the first stop (231).

10. The drug delivery device according to claim 1, characterized in that a first limit part (154) is arranged in the accommodating cavity (15), the push rod (2) is provided with a second limit part (222), and the second limit part (222) is contacted with the first limit part (154) to prevent the push rod (2) from sliding relative to the barrel (1).

11. The drug delivery device according to claim 10, characterized in that the receiving chamber (15) has a first receiving portion (153) with a larger cross-sectional area and a second receiving portion (152) with a smaller cross-sectional area, and a transition portion between the first receiving portion (153) and the second receiving portion (152) forms the first stopper portion (154).

12. The drug delivery device according to any one of claims 1 to 11, further comprising a sealing plug (3), wherein the sealing plug (3) is mounted at the end of the push rod (2), the sealing plug (3) is tightly matched with the inner surface of the accommodating cavity (15), a second limiting part (16) is arranged in the accommodating cavity (15), and a third limiting part (311) matched with the second limiting part (16) is arranged on the outer surface of the sealing plug (3).

13. A drug delivery device according to claim 12, wherein the sealing plug (3) comprises a plug body (31) and a tail portion (32) extending from the plug body (31), the barrel (1) comprising a mounting portion (11) for mounting a needle, the tail portion (32) having a length greater than the length of the mounting portion (11).

14. A method of drug delivery based on a drug delivery device as claimed in any of claims 1 to 13, comprising:

when the first blocking part (231) is in a first state, the push rod (2) is pushed to slide relative to the cylinder body (1), and when the first blocking part (231) is in contact with the end face of the second port (102), first administration is completed;

and the state of the first blocking part (231) is switched to a second state, and the push rod (2) is continuously pushed to slide relative to the cylinder body (1) until the second administration is finished.

15. The administration method according to claim 14, wherein switching the state of the first barrier (231) to the second state comprises:

pressing the first stopper 231 to reduce the size of the push rod 2 so that the push rod 2 can pass through the second port 102.

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