CN110141727B

CN110141727B - Drug delivery device

Info

Publication number: CN110141727B
Application number: CN201910371652.9A
Authority: CN
Inventors: 王春生
Original assignee: Gan Gan Medical Science And Technology Jiangsu Co ltd
Current assignee: Gan Gan Medical Science And Technology Jiangsu Co ltd
Priority date: 2019-05-06
Filing date: 2019-05-06
Publication date: 2024-07-30
Anticipated expiration: 2039-05-06
Also published as: CN110141727A

Abstract

The present application provides a drug delivery device comprising: the shell is provided with a medicine cavity and a containing cavity which are communicated with each other, and the medicine cavity is used for placing a medicine bottle; the driving mechanism is movably arranged in the accommodating cavity and comprises a driving member, a tail cover and a dosage member, one end of the driving member is a driving end, an accommodating hole is formed in the driving end, one end of the dosage member is an inserting end, the inserting end of the dosage member is sleeved on the driving member by the other end of the driving member and penetrates through the accommodating hole, the tail cover is arranged in the accommodating hole, a clamping structure is arranged among the driving member, the tail cover and the dosage member, and the clamping structure is used for fixing the driving member, the tail cover and the dosage member; the injection mechanism is arranged in the medicine cavity and the accommodating cavity in a penetrating way; the driving mechanism drives the injection mechanism to perform injection through the transmission mechanism. The technical scheme provided by the application can solve the problems of high cost and poor quality in the prior art.

Description

Drug delivery device

Technical Field

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

Background

Currently, drug delivery devices generally comprise a housing, a drive mechanism, an injection mechanism and a transmission mechanism. The driving mechanism comprises a driving member, a tail cover and a dosage member, and the driving mechanism drives the injection mechanism to inject through the transmission mechanism.

In the prior art, the driving member, the tail cover and the dosage member in the driving mechanism are bonded by glue to complete fixation, and in this way, the problems of high production cost and poor product quality exist.

Disclosure of Invention

The invention provides a drug delivery device, which aims to solve the problems of high cost and poor quality in the prior art.

The present invention provides a drug delivery device comprising: the shell is provided with a medicine cavity and a containing cavity which are communicated with each other, and the medicine cavity is used for placing a medicine bottle; the driving mechanism is movably arranged in the accommodating cavity and comprises a driving member, a tail cover and a dosage member, one end of the driving member is a driving end, an accommodating hole is formed in the driving end, one end of the dosage member is an inserting end, the inserting end of the dosage member is sleeved on the driving member by the other end of the driving member, the inserting end is arranged in the accommodating hole in a penetrating mode, the tail cover is arranged in the accommodating hole, a clamping structure is arranged among the driving member, the tail cover and the dosage member, and the clamping structure is used for fixing the driving member, the tail cover and the dosage member; the injection mechanism is arranged in the medicine cavity and the accommodating cavity in a penetrating way; the transmission mechanism is arranged between the driving mechanism and the injection mechanism, and the driving mechanism drives the injection mechanism to perform injection through the transmission mechanism.

Further, the bottom of holding the hole sets up through-hole and first boss, and first boss is located one side of through-hole, is provided with first inserted sheet on the insertion end of dosage component, is provided with the second boss on the inner wall of first inserted sheet, and first inserted sheet inserts to holding in the hole by the through-hole, and first boss and second boss joint cooperation to make dosage component and drive component fixed connection.

Further, one end of the tail cover facing the driving member is provided with a second inserting sheet, the second inserting sheet is inserted into a gap formed by the first inserting sheet and the inner wall of the driving member, and the second inserting sheet is used for fixing the position of the first inserting sheet in the through hole.

Further, a limiting part is arranged between the driving component and the tail cover, and the limiting part is used for fixedly connecting the tail cover with the driving component.

Further, a first limit groove is formed in the side wall of the tail cover along the circumferential direction, a third boss is arranged on the inner wall of the accommodating hole and corresponds to the first limit groove, and the axial displacement of the tail cover relative to the driving member is limited through the cooperation of the first limit groove and the third boss.

Further, a second limiting groove is formed in the side wall of the tail cover along the axial direction, a fourth boss is arranged on the inner wall of the accommodating hole, the fourth boss and the second limiting groove are correspondingly arranged, and the tail cover is matched with the fourth boss to limit the tail cover to rotate relative to the driving member.

Further, the drive mechanism further comprises a support piece fixedly arranged in the accommodating cavity, the drive member is movably arranged in the support piece, the dosage member is located on the outer side of the support piece, the support piece is in threaded connection with the drive member, a limiting structure is arranged between the support piece and the drive member, and the limiting structure is used for limiting the drive member to be separated from the support piece.

Further, the driving member and the supporting piece are both provided with a thread structure, the thread structure of the driving member is provided with a limiting boss, the thread structure of the supporting piece is provided with a limiting groove, the limiting boss and the limiting groove form a limiting structure, and the limiting boss is matched with the limiting groove to prevent the driving member from falling out of the supporting piece.

Further, the limit boss is located one end of the driving member away from the driving end, the end of the driving member away from the driving end is provided with an opening, the opening extends along the axial direction of the driving member, and the opening is located on one side of the limit boss along the circumferential direction of the driving member.

Further, the screw thread of support piece and drive component is multi-line structure, is provided with two spacing bosss and two openings on the drive component, and two spacing bosss symmetry sets up in drive component's both sides, and two spacing bosss and two opening one-to-one set up, are provided with two spacing grooves on the support piece, two spacing grooves and two spacing bosss one-to-one to restrict jointly and drive component and deviate from in the support piece.

Further, the actuating mechanism still includes the caudal peduncle, drive mechanism includes the connecting cylinder that sets gradually along the direction of the other end of drive end to actuating member, first rotary drum gear and second rotary drum gear, injection mechanism part wears to establish in actuating member, the connecting cylinder, first rotary drum gear and second rotary drum gear all overlap and establish on injection mechanism, and first rotary drum gear is connected with injection mechanism, the connecting cylinder has first end and second end, the first end of connecting cylinder is worn out by the tail cover, the caudal peduncle is connected with the first end of connecting cylinder, first rotary drum gear passes through gear engagement with the first terminal surface of second rotary drum gear, be provided with the step on the inner wall of drive end of keeping away from of actuating member, one side towards the caudal peduncle of step is provided with the gear, the second terminal surface and the gear engagement of second rotary drum gear, first rotary drum gear, second rotary drum gear and connecting cylinder all can relative actuating member axial displacement.

By applying the technical scheme of the invention, the drug delivery device comprises a shell, a driving mechanism, an injection mechanism and a transmission mechanism. Wherein, the casing has the medicine chamber and holds the chamber of intercommunication each other, and the medicine chamber is used for placing the medicine bottle. The drive mechanism is movably arranged in the accommodating cavity, the drive mechanism comprises a drive member, a tail cover and a dosage member, specifically, one end of the drive member is a drive end, an accommodating hole is formed in the drive end, one end of the dosage member is an insertion end, the insertion end of the dosage member is sleeved on the drive member by the other end of the drive member, the insertion end is arranged in the accommodating hole in a penetrating mode, the tail cover is arranged in the accommodating hole, a clamping structure is arranged among the drive member, the tail cover and the dosage member, and the clamping structure is used for fixing the drive member, the tail cover and the dosage member. The injection mechanism is arranged in the medicine cavity and the accommodating cavity in a penetrating way, the transmission mechanism is arranged between the driving mechanism and the injection structure, and the driving mechanism drives the injection mechanism to inject through the transmission mechanism.

The drive member, the tail cap and the dose member are fixed by means of the snap-in structure by arranging the insertion end of the dose member through the receiving hole of the drive member and the tail cap in the receiving hole. By adopting the structure, compared with the prior art that the device is fixed by using the bonding mode, the technical scheme can reduce the processing cost of the device and improve the quality of the device.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 shows a schematic structural view of a drug delivery device provided according to an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the drive mechanism of FIG. 1;

fig. 3 shows an assembly view of the drive member and the dose member of fig. 1;

fig. 4 shows a schematic structural view of the dosage element of fig. 1;

fig. 5 shows a schematic structural view of the driving member in fig. 1;

fig. 6 shows a further schematic structural view of the drive member of fig. 1;

FIG. 7 shows a schematic view of the tail cap of FIG. 1;

FIG. 8 shows a further cross-sectional view of the drive mechanism of FIG. 1;

fig. 9 shows a further schematic structural view of the drive member of fig. 1;

fig. 10 shows a schematic structural view of the support in fig. 1;

FIG. 11 shows an assembly view of the drive member and support of FIG. 1;

FIG. 12 shows a further schematic structural view of the drive member of FIG. 1;

FIG. 13 shows a schematic structural view of the second drum gear of FIG. 1;

FIG. 14 shows a schematic structural view of the injection mechanism of FIG. 1;

FIG. 15 shows a schematic view of the large push rod of FIG. 14;

FIG. 16 is a schematic view showing the construction of the push rod driver cartridge of FIG. 1;

FIG. 17 is a schematic view showing the structure of the small push rod in FIG. 1;

FIG. 18 shows a schematic structural view of the second pushrod gear of FIG. 1;

FIG. 19 shows a schematic structural view of the first drum gear of FIG. 1;

fig. 20 shows a further structural schematic diagram of the support in fig. 1.

Wherein the above figures include the following reference numerals:

1. A tail handle;

2. A driving member; 2a, through holes; 2b, a first boss; 2c, a third boss; 2d, limiting bosses; 2e, gears; 2f, accommodating holes; 2g, a fourth boss; 2h, opening;

3. A tail cover; 3a, a second inserting sheet; 3b, a first limit groove; 3c, a second limit groove;

4. A dose member; 4a, a first inserting sheet; 4b, a second boss; 4c, an insertion end;

6. a connecting cylinder; 7. a first drum gear; 7a, limiting ribs;

8. a support; 8a, a limit groove;

9. a second drum gear; 10. a large push rod; 10a, a limit groove;

11. a third drum gear; 12. a first pushrod gear; 13. a push rod driving cylinder; 14. a second pushrod gear; 14a, limit ribs; 15. a fixed plug;

16. A small push rod; 16a, a limit groove;

17. A drug chamber; 18. a small spring; 19. a large spring; 20. a middle spring; 21. a medicine bottle.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 11, an embodiment of the present invention provides a drug delivery device comprising: a shell, a driving mechanism, an injection mechanism and a transmission mechanism. Wherein, the casing has the medicine chamber and holds the chamber of intercommunication each other, and the medicine chamber is used for placing the medicine bottle. The drive mechanism is movably arranged within the receiving cavity, wherein the drive mechanism may be configured to perform a setting movement for setting a medicament dose of the device and to initiate and perform a dispensing movement for dispensing the medicament dose. In particular, the drive mechanism comprises a drive member 2, a tail cap 3 and a dose member 4. In particular, the dose member 4 is used for adjusting the dose of medicament to be delivered and displaying the counted number.

Wherein, one end of the driving member 2 is a driving end, and the driving end is provided with a containing hole 2f, one end of the dosage member 4 is an inserting end, the inserting end of the dosage member 4 is sleeved on the driving member 2 by the other end of the driving member 2, and the inserting end is penetrated in the containing hole 2 f. In order to further enhance the fixing effect of the device, the tail cap 3 is arranged in the accommodating hole 2f, and a clamping structure is arranged among the driving member 2, the tail cap 3 and the dosage member 4, specifically, the clamping structure is used for fixing the driving member 2, the tail cap 3 and the dosage member 4 so as to complete the fixing of the driving mechanism. Specifically, by arranging the clamping structure between the driving member 2, the tail cover 3 and the dosage member 4, three parts of the driving member 2, the tail cover 3 and the dosage member 4 can be mutually clamped, so that the three parts cannot axially move or relatively rotate, and the driving member is fixed. Specifically, injection mechanism wears to establish in the medicine chamber and holds the intracavity, and drive mechanism sets up between actuating mechanism and injection structure, and actuating mechanism passes through drive mechanism drive injection mechanism and carries out the injection. The dose member 4 is fitted over the drive member 2, and the tail cap 3 is provided in the accommodation hole 2f of the drive member 2, so that the volume of the device can be reduced, and the portability of the device can be improved.

The technical scheme provided by the application is that the drug delivery device comprises a shell, a driving mechanism, an injection mechanism and a transmission mechanism. Wherein, the casing has the medicine chamber and holds the chamber of intercommunication each other, and the medicine chamber is used for placing the medicine bottle, and actuating mechanism movable setting holds the intracavity at the casing. Specifically, when the drive mechanism is assembled, the insertion end of the dose member 4 is first sleeved on the drive member 2 from the end of the drive member 2 away from the drive end, and the insertion end is inserted into the receiving hole 2f of the drive member 2. The tail cap 3 is then arranged in the receiving hole 2f and the fixation of the drive mechanism is accomplished with the use of an engagement structure arranged between the drive member 2, the tail cap 3 and the dosing member 4. Through utilizing the joint structure to fix actuating mechanism, the three of being convenient for is fixed, reduces the manufacturing cost of device, and adopts this kind of fixed mode can promote the quality of device, and then promotes the yields of product, prolongs the life of product.

As shown in fig. 3 to 6, the bottom of the accommodation hole 2f is provided with a through hole 2a and a first boss 2b, the first boss 2b being located at one side of the through hole 2 a. The first boss 2b may be located on the upper surface where the through hole 2a is located or on the side wall of the receiving hole 2f, and in this embodiment, the first boss 2b is located on the upper surface of the through hole 2 a. In order to ensure the fixing effect of the dose member 4 and the driving member 2, a first insertion piece 4a is provided at the insertion end of the dose member 4, a second boss 4b is provided on the inner wall of the first insertion piece 4a, the first insertion piece 4a is inserted into the accommodating hole 2f from the through hole 2a, and the first boss 2b is in clamping fit with the second boss 4b, so that the dose member 4 is fixedly connected with the driving member 2. In order to further enhance the fixing effect of the dose member 4 with the drive member 2, in this embodiment, three through holes 2a are evenly arranged at the bottom of the receiving hole 2f, and correspondingly, three first tabs 4a are provided for the dose member 4. Specifically, when the dose member 4 and the driving member 2 are assembled, the three second bosses 4b of the dose member 4 are expanded outwards, so that the first insert piece 4a is inserted into the through hole 2a, then the second bosses 4b are reset, and the first bosses 2b are in clamping fit with the second bosses 4b, so that the dose member 4 and the driving member 2 are fixedly connected. With the above structure, the first insert piece 4a of the dose member 4 is inserted into the through hole 2a of the drive member 2, the dose member 4 cannot rotate relative to the drive member 2, and the second boss 4b of the dose member 4 is engaged with the first boss 2b of the drive member 2, so that the dose member 4 cannot axially move relative to the drive member 2.

As shown in fig. 7, the end of the tail cap 3 facing the driving member 2 is provided with a second insert sheet 3a, and the second insert sheet 3a is inserted into a gap formed between the first insert sheet 4a and the inner wall of the driving member 2, and the second insert sheet 3a is used for fixing the position of the first insert sheet 4a in the through hole 2 a. Correspondingly, in this embodiment, three second tabs 3a are also provided, in particular, the second tabs 3a are inserted into slits created after the assembly of the drive member 2 and the dose member 4, so that the first tabs 4a of the dose member 4 have no outwardly expanding space, thereby ensuring a fixing effect of the drive member 2 and the dose member 4. Specifically, in the present embodiment, the second insert sheet 3a is inserted into a gap created after the drive member 2 and the dosage member 4 are assembled, and one end of the second insert sheet 3a is located in the through hole 2 a.

In other embodiments, the length of the second insert sheet 3a may be controlled such that it is only inserted into the gap created by the assembly of the drive member 2 and the dosing member 4, and the second insert sheet 3a is not inserted into the through hole 2a, such that the second insert sheet 3a is entirely located outside the through hole 2 a. With the above structure, the second insert 3a can be used to fix the position of the first insert 4a in the through hole 2a, and the manufacturing cost of the device can be reduced.

In this embodiment, a limiting portion is disposed between the driving member 2 and the tail cap 3, and the limiting portion is used to fixedly connect the tail cap 3 and the driving member 2, so as to prevent the tail cap 3 from being separated from the driving member 2 and/or prevent the tail cap 3 from rotating relative to the driving member 2.

Specifically, be provided with first spacing groove 3b on the lateral wall of tail-hood 3, first spacing groove 3b extends along circumference, and is provided with third boss 2c on the inner wall of holding hole 2f, and third boss 2c corresponds the setting with first spacing groove 3b, cooperates with third boss 2c in order to restrict the axial displacement of tail-hood 3 relative drive component 2 through first spacing groove 3b, and then avoids tail-hood 3 to break away from drive component 2.

Wherein, be provided with second spacing groove 3c along the axial on the lateral wall of tail cap 3, and be provided with fourth boss 2g on the inner wall of accommodation hole 2f, fourth boss 2g corresponds the setting with second spacing groove 3c, cooperates with fourth boss 2g in order to restrict the relative drive member 2 rotation of tail cap 3 through second spacing groove 3 c.

In this embodiment, a second limit groove 3c is circumferentially provided on the side wall of the tail cap 3, and correspondingly, a third boss 2c is provided on the inner wall of the accommodating hole 2 f. Three second limit grooves 3c are axially formed in the side wall of the tail cover 3, the three second limit grooves 3c are evenly distributed at intervals, and correspondingly, three fourth bosses 2g are arranged on the inner wall of the accommodating hole 2 f. Specifically, the second limiting groove 3c is perpendicular to the first limiting groove 3b, and the second limiting groove 3c penetrates through the first limiting groove 3b. Correspondingly, the fourth bosses 2g are arranged perpendicular to the third bosses 2c, wherein one end of two fourth bosses 2g is abutted against the third bosses 2c, and the other fourth boss 2g penetrates through the third bosses 2c. By passing one of the fourth bosses 2g through the third boss 2c with its end flush with the end of the driving member 2, the fourth boss 2g can be used to position and guide the tail cap 3 when assembling the tail cap 3 and the driving member 2.

Specifically, in this embodiment, the tail cap 3 is an elastic piece, when the tail cap 3 and the driving member 2 are assembled, by applying an axial force to the tail cap 3, the tail cap 3 is positioned and guided by using the fourth boss 2g passing through the third boss 2c or the gap generated after the driving member 2 and the dosage member 4 are assembled, the tail cap 3 is pressed into the accommodating hole 2f, and the first limiting groove 3b is matched with the third boss 2c to limit the axial displacement of the tail cap 3 and the driving member 2, and the second limiting groove 3c is matched with the fourth boss 2g to limit the rotation of the tail cap 3 relative to the driving member 2. By adopting the structure, the three parts of the drive member 2, the tail cap 3 and the dosage member 4 are interlocked, so that the dosage member 4 can be prevented from being separated from the drive member 2.

As shown in fig. 8 to 11, the drive mechanism further comprises a support 8, the support 8 being fixedly arranged in the receiving cavity, the drive member 2 being movably arranged in the support 8, the dose member 4 being located outside the support 8, so arranged that the scale on the dose member 4 is easily observed. In this embodiment, one end of the support 8 is fixedly connected to the housing and is located within the housing, the other end of the support 8 being located inside the dosage element 4. The support piece 8 is in threaded connection with the driving member 2, and a limiting structure is arranged between the support piece 8 and the driving member 2 for improving the connection stability of the device, and is used for limiting the driving member 2 from being separated from the support piece 8. In particular, by providing a limit structure, the limit structure can prevent the drive member 2 from escaping from the support 8 when the dose is adjusted by the drive member 2, when adjusted to the maximum dose of the device.

Specifically, the driving member 2 and the supporting piece 8 are both provided with a thread structure, a limit boss 2d is arranged on the thread structure of the driving member 2, a limit groove 8a is arranged on the thread structure of the supporting piece 8, the limit boss 2d and the limit groove 8a form a limit structure, and the limit boss 2d is matched with the limit groove 8a to prevent the driving member 2 from falling out of the supporting piece 8. In the present embodiment, the thread structure on the support member 8 is partially broken, whereby the broken portion of the thread structure forms the limit groove 8a.

Specifically, the limit boss 2d is located at one end of the driving member 2 far away from the driving end, correspondingly, the limit groove 8a is located at one end of the supporting piece 8 near the driving member 2, and the limit boss 2d and the limit groove 8a are both disposed at the thread stop position of the thread structure. In order to facilitate the assembly of the driving member 2 with the support 8, an opening 2h is provided at the end of the driving member 2 remote from the driving end, the opening 2h extending in the axial direction of the driving member 2, and the opening 2h being located on one side of the limit boss 2d in the circumferential direction of the driving member 2. The end face, close to the opening 2h, of the limiting boss 2d is parallel to the opening 2h, the end face, far away from the opening 2h, of the limiting boss 2d is an inclined surface, and the end portion of the limiting groove 8a is subjected to chamfering treatment.

When the driving member 2 and the supporting piece 8 are assembled, the limit boss 2d of the driving member 2 is contacted with the limit groove 8a of the supporting piece 8 first, and specifically, the side of the limit boss 2d with the inclined surface is contacted with the limit groove 8a first. Then, the end of the driving member 2 is deformed by pressing the opening 2h of the driving member 2 to fit the driving member 2 into the supporter 8 and to engage with the limit groove 8a through the limit boss 2d to prevent the driving member 2 from being removed from the supporter 8. And, through setting up the inclined plane on spacing boss 2d to the tip of spacing groove 8a is done chamfer and is handled, is convenient for assemble drive member 2 and support 8.

In particular, the threads of the support 8 and of the driving member 2 are of multi-thread construction, so as to promote the connection stability of the device. In the present embodiment, the threads of both the support 8 and the driving member 2 are provided in a three-thread structure. Wherein the support 8 and the driving member 2 are both a single-threaded and a double-threaded combined structure to form a triple-threaded structure. Wherein, be provided with two spacing bosss 2d and two openings 2h on the drive component 2, two spacing bosss 2d symmetry set up in the both sides of drive component 2, and two spacing bosss set up with two openings 2h one-to-one, are provided with two spacing groove 8a on the support 8, and two spacing groove 8a and two spacing bosss 2d one-to-one to jointly restrict drive component 2 and deviate from in the support 8. By adopting the structure, the clamping points of the limiting boss 2d and the limiting groove 8a are mutually symmetrical when the limiting boss and the limiting groove are contacted, so that the stability of the structure is further improved. And, compare in prior art and utilize the spiral to loose core to carry out the mode of processing to support piece 8, the device that this embodiment provided only need utilize the mould can realize the preparation to support piece 8, need not to adopt other processes, so be convenient for simplify processing procedure, promote and controlling means's quality.

In this embodiment, the driving mechanism further includes a tail handle 1, the transmission mechanism includes a connecting tube 6, a first rotary tube gear 7 and a second rotary tube gear 9 which are sequentially disposed along the direction from the driving end to the other end of the driving member 2, the injection mechanism portion is disposed in the driving member 2 in a penetrating manner, the connecting tube 6, the first rotary tube gear 7 and the second rotary tube gear 9 are all disposed on the injection mechanism in a sleeved manner, the first rotary tube gear 7 is connected with the injection mechanism, the connecting tube 6 has a first end and a second end, the first end of the connecting tube 6 is disposed through the tail cover 3, the tail handle 1 is connected with the first end of the connecting tube 6, and the tail handle 1 can rotate relative to the connecting tube 6, so that the injection operation is facilitated when the tail handle 1 is pressed for injection.

As shown in fig. 2, 12 and 13, the first end face of the first drum gear 7 and the first end face of the second drum gear 9 are meshed through gears, a step is arranged on the inner wall of the driving member 2 far away from the driving end, a gear 2e is arranged on one side of the step, facing the tail handle 1, of the step, the second end face of the second drum gear 9 is meshed with the gear 2e, and the first drum gear 7, the second drum gear 9 and the connecting drum 6 can axially move relative to the driving member 2. By adopting the structure, when the driving member 2 is rotated, the first rotary drum gear 7, the second rotary drum gear 9 and the connecting drum 6 can axially move to a certain extent relative to the driving member 2, so that the second rotary drum gear 9 rotates relative to the first rotary drum gear 7 or the driving member 2, the power transmission of the driving mechanism to the injection mechanism is ensured by the transmission mechanism, and the injection operation is further completed.

As shown in fig. 14 to 20, the injection mechanism includes a large push rod 10, a third barrel gear 11, a first push rod gear 12, a push rod drive cylinder 13, a second push rod gear 14, and a small push rod 16. Wherein, the inner surface of the first rotary drum gear 7 is provided with a limit rib 7a, the outer surface of the large push rod 10 is provided with a limit groove 10a, and the first rotary drum gear 7 can only axially move relative to the large push rod 10 and can not rotate relatively through the cooperation of the limit rib 7a and the limit groove 10 a. Wherein the third drum gear 11 is in gear engagement with the first push rod gear 12, and the second push rod gear 14 is in gear engagement with the large push rod 10.

In the present embodiment, a middle spring 20 is provided between the large push rod 10 and the first push rod gear 12, and the middle spring 20 is in a pre-tensioned state, and the first push rod gear 12 and the third drum gear 11 are in a meshed state under the elastic force of the middle spring 20. A small spring 18 is provided between the tail cap 3 and the connecting tube 6, and the small spring 18 is in a pre-tensioned state. With the above structure, when the syringe is positively regulated to increase the scale, the driving member 2 rotates relative to the second drum gear 9; when the syringe is adjusted back to the reduced scale, the first barrel gear 7 rotates relative to the second barrel gear 9, but no injection effect is produced regardless of the normal adjustment or the adjustment back operation because the torsion force generated by the jump of the small spring 18 is smaller than the torsion force for separating the third barrel gear 11 from the first push rod gear 12.

As shown in fig. 16 to 18, the inner surface of the second pushrod gear 14 has a limiting rib 14a, the outer surface of the small pushrod 16 has a limiting groove 16a, and the small pushrod 16 can only move axially relative to the second pushrod gear 14 and cannot rotate relative to the second pushrod gear 14 because the second pushrod gear 14 is fixed on the pushrod driving cylinder 13 through the cooperation of the limiting rib 14a and the limiting groove 16 a.

In the present embodiment, the push rod driving cylinder 13 is fixedly provided on the fixed plug 15, and the inner wall of the push rod driving cylinder 13 is provided with an internal thread, and the outer surface of the small push rod 16 is provided with an external thread. Because the push rod driving cylinder 13 and the small push rod 16 are in threaded fit, when the small push rod 16 rotates, the small push rod 16 moves axially relative to the push rod driving cylinder 13, so that injection or reset operation is realized. In order to enhance the pushing effect of the small push rod 16 on the medicine, a piston is provided at one end of the small push rod 16 away from the driving member.

In this embodiment, the drug delivery device further comprises a drug chamber 17, and the cavity of the drug chamber 17 is a drug cavity. When the medicine bottle 21 is placed in the medicine chamber 17, the medicine chamber 17 is arranged on the fixed plug 15 in a threaded connection mode, one side, close to the fixed plug 15, of the medicine bottle 21 is contacted with the push rod driving cylinder 13, and an axial force is applied to the push rod driving cylinder 13, so that the second push rod gear 14 is meshed with the large push rod 10. Moreover, since the large spring 19 is provided between the push rod driving cylinder 13 and the third drum gear 11, when the medicine chamber 17 is detached from the fixed stopper 15, the second push rod gear 14 is displaced relative to the large push rod 10 by the elastic force of the large spring 19, and at this time, the second push rod gear 14 is not in engagement with the large push rod 10.

The following further describes the structure of the device by the working principle of the drug delivery device provided by the present embodiment:

(1) Injection procedure

The tail handle 1 is pushed by hand, the tail handle 1 transmits axial force to the driving component 2 through the connecting cylinder 6, the first rotary cylinder gear 7 and the second rotary cylinder gear 9, and the driving component 2 rotates under the action of axial pushing force due to the fact that the driving component 2 is in threaded connection with the supporting piece 8. When the driving member 2 rotates, the driving member 2 drives the second drum gear 9 to rotate, and the second drum gear 9 drives the first drum gear 7 to rotate because of the gear engagement among the driving member 2, the first drum gear 7 and the second drum gear 9. In addition, the large push rod 10 rotates due to the cooperation of the limit rib 7a and the limit groove 10 a. Since the second pushrod gear 14 is geared with the large pushrod 10 at this time, the second pushrod gear 14 also rotates. Through spacing muscle 14a and spacing groove 16a cooperation, little push rod 16 can take place to rotate along with second push rod gear 14, and because push rod drive section of thick bamboo 13 and little push rod 16 are screw thread fit, little push rod 16 can take place axial displacement relative to push rod drive section of thick bamboo 13, and then realizes the injection effect.

(2) Reset procedure

The medicine chamber 17 is rotated, the medicine chamber 17 is detached from the fixed plug 15, and the second pushrod gear 14 is displaced relative to the large pushrod 10 under the elastic force of the large spring 19, and at this time, the second pushrod gear 14 is not in engagement with the large pushrod 10. Pushing the small push rod 16 causes the small push rod 16 to rotate under the action of the pushing force, and since the second push rod gear 14 is not engaged with the large push rod 10, the large push rod 10 remains stationary while the small push rod 16 rotates and moves axially. The small push rod 16 is continuously pushed until the small push rod returns to the initial state, and the reset is completed.

(3) Callback procedure

By rotating the driving member 2 counterclockwise to reduce the scale, the driving member 2 and the second drum gear 9 are relatively stationary, the first drum gear 7 rotates relative to the second drum gear 9, and the third drum gear 11 and the first push rod gear 12 are in a meshed state under the action of the elastic force of the middle spring 20, and the torsion generated by the jump of the small spring 18 is smaller than the torsion for separating the third drum gear 11 and the first push rod gear 12 from the meshed state, so that the injection effect is not generated in the callback process.

(4) Positive adjustment process

By rotating the driving member 2 clockwise to increase the scale, the first drum gear 7 and the second drum gear 9 are relatively stationary, the driving member 2 rotates relative to the second drum gear 9, and the third drum gear 11 and the first push rod gear 12 are in a meshed state under the action of the elastic force of the middle spring 20, and the torsion generated by the jumping of the small spring 18 is smaller than the torsion for separating the third drum gear 11 and the first push rod gear 12 from the meshed state, so that the injection effect is not generated in the positive adjustment process.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A drug delivery device, the drug delivery device comprising:

the medicine box comprises a shell, a medicine box and a medicine box, wherein the shell is provided with a medicine cavity and a containing cavity which are communicated with each other, and the medicine cavity is used for placing a medicine bottle;

The driving mechanism is movably arranged in the accommodating cavity and comprises a driving member (2), a tail cover (3) and a dosage member (4), one end of the driving member (2) is a driving end, an accommodating hole (2 f) and a dosage adjusting knob are arranged on the driving end, the dosage adjusting knob has a larger diameter than the accommodating hole (2 f), one end of the dosage member (4) is an inserting end (4 c), the inserting end (4 c) of the dosage member (4) is sleeved on the driving member (2) by the other end of the driving member (2), the inserting end (4 c) is penetrated in the accommodating hole (2 f), the tail cover (3) is arranged in the accommodating hole (2 f), and a clamping structure is arranged among the driving member (2), the tail cover (3) and the dosage member (4) and used for fixing the driving member (2), the tail cover (3) and the dosage member (4);

the bottom of the accommodating hole (2 f) is provided with a through hole (2 a) and a first boss (2 b), the first boss (2 b) is positioned on one side of the through hole (2 a), a first inserting sheet (4 a) is arranged on an inserting end (4 c) of the dosage component (4), a second boss (4 b) is arranged on the inner wall of the first inserting sheet (4 a), the first inserting sheet (4 a) is inserted into the accommodating hole (2 f) from the through hole (2 a), and the first boss (2 b) is matched with the second boss (4 b) in a clamping mode, so that the dosage component (4) is fixedly connected with the driving component (2);

a second inserting piece (3 a) is arranged at one end of the tail cover (3) facing the driving component (2), the second inserting piece (3 a) is inserted into a gap formed by the first inserting piece (4 a) and the inner wall of the driving component (2), and the second inserting piece (3 a) is used for fixing the position of the first inserting piece (4 a) in the through hole (2 a);

A limiting part is arranged between the driving member (2) and the tail cover (3), and the limiting part is used for fixedly connecting the tail cover (3) with the driving member (2);

A first limit groove (3 b) is formed in the side wall of the tail cover (3) along the circumferential direction, a third boss (2 c) is arranged on the inner wall of the accommodating hole (2 f), the third boss (2 c) is arranged corresponding to the first limit groove (3 b), and the first limit groove (3 b) is matched with the third boss (2 c) to limit the axial displacement of the tail cover (3) relative to the driving component (2);

a second limit groove (3 c) is formed in the side wall of the tail cover (3) along the axial direction, a fourth boss (2 g) is arranged on the inner wall of the accommodating hole (2 f), the fourth boss (2 g) is correspondingly arranged with the second limit groove (3 c), and the second limit groove (3 c) is matched with the fourth boss (2 g) to limit the tail cover (3) to rotate relative to the driving component (2);

the injection mechanism is arranged in the medicine cavity and the accommodating cavity in a penetrating way;

The transmission mechanism is arranged between the driving mechanism and the injection mechanism, and the driving mechanism drives the injection mechanism to perform injection through the transmission mechanism.

2. Drug delivery device according to claim 1, characterized in that the drive mechanism further comprises a support (8), the support (8) being fixedly arranged in the receiving cavity, the drive member (2) being movably arranged in the support (8), the dose member (4) being located outside the support (8), the support (8) being in threaded connection with the drive member (2), a limit structure being arranged between the support (8) and the drive member (2), the limit structure being adapted to limit the drive member (2) from coming out of the support (8).

3. Drug delivery device according to claim 2, characterized in that the drive member (2) and the support (8) are both provided with a screw structure, the screw structure of the drive member (2) is provided with a limit boss (2 d), the screw structure of the support (8) is provided with a limit groove (8 a), the limit boss (2 d) and the limit groove (8 a) form the limit structure, and the limit boss (2 d) cooperates with the limit groove (8 a) to prevent the drive member (2) from falling out of the support (8).

4. A drug delivery device according to claim 3, characterized in that the limit boss (2 d) is located at an end of the drive member (2) remote from the drive end, the end of the drive member (2) remote from the drive end is provided with an opening (2 h), the opening (2 h) extends in the axial direction of the drive member (2), and the opening (2 h) is located at one side of the limit boss (2 d) in the circumferential direction of the drive member (2).

5. Drug delivery device according to claim 4, characterized in that the threads of the support (8) and the drive member (2) are of a multi-thread structure, the drive member (2) is provided with two limit bosses (2 d) and two openings (2 h), the two limit bosses (2 d) are symmetrically arranged on two sides of the drive member (2), the two limit bosses are arranged in a one-to-one correspondence with the two openings (2 h), the support (8) is provided with two limit grooves (8 a), and the two limit grooves (8 a) are in a one-to-one correspondence with the two limit bosses (2 d) so as to jointly limit the drive member (2) from being released from the support (8).

6. Drug delivery device according to claim 1, characterized in that the drive mechanism further comprises a tail handle (1), the transmission mechanism comprises a connecting cylinder (6), a first cylinder gear (7) and a second cylinder gear (9) which are arranged in sequence along the direction from the drive end to the other end of the drive member (2), the injection mechanism part is arranged in the drive member (2) in a penetrating way, the connecting cylinder (6), the first cylinder gear (7) and the second cylinder gear (9) are all sleeved on the injection mechanism, and the first cylinder gear (7) is connected with the injection mechanism, the connecting cylinder (6) is provided with a first end and a second end, the first end of the connecting cylinder (6) is penetrated out by the tail cap (3), the tail handle (1) is connected with the first end of the connecting cylinder (6), the first cylinder gear (7) is meshed with the first end face of the second cylinder gear (9) through a gear, the inner wall of the drive member (2) far from the step gear (7) is arranged on the inner wall of the drive member (2), the tail handle (6) is provided with a first end face (2), the tail handle (7) is meshed with the second cylinder gear (2), and the tail handle (2) is arranged on one side (e) of the step gear (2) The second drum gear (9) and the connecting drum (6) are both axially movable relative to the drive member (2).