CN218923442U - Pen type injection device and rewinding structure thereof - Google Patents
Pen type injection device and rewinding structure thereof Download PDFInfo
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- CN218923442U CN218923442U CN202221729667.1U CN202221729667U CN218923442U CN 218923442 U CN218923442 U CN 218923442U CN 202221729667 U CN202221729667 U CN 202221729667U CN 218923442 U CN218923442 U CN 218923442U
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- injection device
- pen
- plunger
- connecting part
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Abstract
The utility model discloses a rewinding structure of a pen-type injection device, belonging to the technical field of drug administration injection, wherein the rewinding structure comprises: the rewinding ring is sleeved on the outer peripheral surface of the medicine cartridge, the rewinding ring comprises a rotating part and a connecting part which are axially arranged, one end of the rotating part, which is away from the connecting part, is connected to the medicine cartridge, a limiting part is arranged on the outer peripheral surface of the connecting part, a through hole is formed in the end surface of one side, which is away from the rotating part, of the connecting part, a plunger of the pen-type injection device is inserted in the through hole, and the connecting part is provided with a connecting part matched with the plunger to drive the plunger to rotate; the ratchet sleeve is fixed on the main body of the pen-type injection device, the ratchet sleeve is sleeved on the outer peripheral surface of the connecting part, and a fixing piece matched with the limiting piece is arranged on the inner wall surface of the ratchet sleeve. The plunger can not be retracted too much due to excessive rotation of the rewinding ring, the problem of empty stroke of the plunger caused by introduction is solved, the accuracy of injection dosage is ensured, and the safety of patients is ensured.
Description
Technical Field
The utility model relates to the technical field of drug administration injection, in particular to a pen-type injection device and a rewinding structure thereof.
Background
At present, a pen type drug administration injection device is a device which combines a drug and an injector into a whole and mainly comprises a trigger, a main body, a driving device, a force storage device, a drug cartridge and a needle. The medicament is stored in a cartridge, typically for use with a particular injection device. When in use, the safety helmet is taken down, the disposable injection needle is arranged and exhausted, and the drug delivery is realized by adjusting the required dosage and driving the trigger. In pen administration injection devices, it is necessary that the plunger be moved away from the needle tip before loading the cartridge for the first administration in preparation for injection and for the force accumulation of the torsion spring; the torsion spring connected with the plunger is used for driving the plunger to withdraw and enabling the driving shaft to compress the accumulated force, but when the plunger is manually operated, the torsion spring is easy to rotate excessively, so that the plunger withdraws too much distance to generate a plunger idle stroke, the accuracy of injection dosage can be influenced when the plunger idle stroke is generated, and patients face various pathological dangers caused by insufficient injection dosage.
Disclosure of Invention
The purpose of the utility model is that: the rewinding structure of the pen-type injection device is provided, the problem that the plunger is retreated too much due to excessive rotation of the rewinding ring and the empty stroke of the plunger is caused by introduction is avoided, the accuracy of injection dosage is ensured, and the safety of patients is ensured.
In order to achieve the above object, the present utility model provides a rewinding structure of a pen-type injection device, comprising:
the rewinding ring is sleeved on the outer peripheral surface of the medicine cartridge, the rewinding ring comprises a rotating part and a connecting part which are axially arranged, one end of the rotating part, which is opposite to the connecting part, is connected to the medicine cartridge, a limiting part is arranged on the outer peripheral surface of the connecting part, a through hole is formed in the end surface, which is opposite to the rotating part, of the connecting part, a plunger of a pen-type injection device is inserted into the through hole, and the connecting part is provided with a connecting part matched with the plunger so as to drive the plunger to rotate;
the ratchet sleeve is fixed on the main body of the pen-type injection device, the ratchet sleeve is sleeved on the outer peripheral surface of the connecting part, and a fixing piece matched with the limiting piece is arranged on the inner wall surface of the ratchet sleeve.
Compared with the prior art, the rewinding structure of the pen-type injection device has the beneficial effects that: the rewinding ring is sleeved on the outer peripheral surface of the medicine cartridge, the rotating part of the rewinding ring is used for being held and rotated by a user, the connecting part is used for connecting the ratchet sleeve, the main body of the pen-type injection device, the plunger and other parts, and the plunger is inserted into the axial through hole of the connecting part and coaxially rotates with the rewinding ring through the connecting piece; the ratchet sleeve is fixedly arranged relative to the rewinding ring through the main body, the ratchet sleeve is sleeved on the outer peripheral surface of the connecting part and the inner wall surface of the ratchet sleeve is provided with a fixing piece, the connecting part is provided with a limiting piece matched with the fixing piece, the rotating angle of the rewinding ring relative to the ratchet sleeve can be limited in a certain range by the aid of the limiting piece and the fixing piece, the problem that the plunger is retracted too much due to excessive rotation of the rewinding ring, and the empty stroke of the plunger is caused by introduction is avoided, the accuracy of injection dosage is guaranteed, and the safety of patients is guaranteed.
In the rewinding structure of the pen-type injection device, the limiting piece comprises at least two ratchet teeth which are oppositely arranged, and the fixing piece comprises a stop post matched with the size of the ratchet teeth.
In the rewinding structure of the pen injection device according to the embodiment of the utility model, the ratchet teeth are elastic members and extend towards the inside of the rewinding ring, and the gap between the cartridge and the rewinding ring is smaller than the size of the elastic deformation of the ratchet teeth.
According to the rewinding structure of the pen-type injection device, the connecting piece comprises the finger part formed on the inner wall of the through hole, and the plunger is provided with the clamping groove matched with the finger part along the axial direction of the plunger.
According to the rewinding structure of the pen-type injection device, two symmetrically arranged finger parts are formed in the through hole, and two clamping grooves matched with the finger parts are formed at two radial ends of the plunger respectively.
According to the rewinding structure of the pen-type injection device, a buckle is arranged at one end, close to the main body, of the ratchet sleeve, and a clamping groove matched with the buckle is formed at one end, close to the ratchet sleeve, of the main body.
In the rewinding structure of the pen-type injection device provided by the embodiment of the utility model, the ratchet sleeve is provided with a plurality of buckles, and the main body is provided with a plurality of clamping grooves matched with a plurality of buckles.
According to the rewinding structure of the pen-type injection device, the rotating part is provided with the internal threads towards one end of the cartridge, and the cartridge is provided with the external threads matched with the internal threads.
According to the rewinding structure of the pen-type injection device, a counter bore is formed in the end face, facing to one side of the plunger, of the connecting portion so as to fix the torsion spring of the pen-type injection device, and the torsion spring is arranged in the driving shaft of the pen-type injection device.
To achieve the above object, the present utility model provides a pen injection device comprising any one of the rewinding structures described in the above embodiments.
Compared with the prior art, the pen type injection device provided by the embodiment of the utility model has the beneficial effects that: the pen-type injection device is provided with a rewinding ring and a ratchet sleeve, the rewinding ring is sleeved on the outer peripheral surface of the cartridge, the rotating part of the rewinding ring is used for being held and rotated by a user, the connecting part is used for connecting the ratchet sleeve, the main body of the pen-type injection device, the plunger and other parts, and the plunger is inserted into an axial through hole of the connecting part and coaxially rotates with the rewinding ring through a connecting piece; the ratchet sleeve is fixedly arranged relative to the rewinding ring through the main body, the ratchet sleeve is sleeved on the outer peripheral surface of the connecting part and the inner wall surface of the ratchet sleeve is provided with a fixing piece, the connecting part is provided with a limiting piece matched with the fixing piece, the rotating angle of the rewinding ring relative to the ratchet sleeve can be limited in a certain range by the aid of the limiting piece and the fixing piece, the problem that the plunger is retracted too much due to excessive rotation of the rewinding ring, and the empty stroke of the plunger is caused by introduction is avoided, the accuracy of injection dosage is guaranteed, and the safety of patients is guaranteed.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is an exploded schematic view of a rewind structure of a pen injection device according to an embodiment of the present utility model;
FIG. 2 is an assembled schematic view of a rewind structure of a pen injection device according to an embodiment of the present utility model;
FIG. 3 is a schematic view of a rewind ring of a rewind structure of a pen-type injection device according to an embodiment of the present utility model;
FIG. 4 is a schematic view of another orientation of a rewind ring of a rewind structure of a pen-type injection device according to an embodiment of the present utility model;
FIG. 5 is a schematic illustration of a ratchet sleeve of a rewind configuration of a pen injection device according to an embodiment of the present utility model;
FIG. 6 is a schematic illustration of the plunger of a rewind configuration of a pen injection device according to an embodiment of the present utility model;
FIG. 7 is a schematic view of the structure of the inside of the main body of the rewinding structure of the pen-type injection device according to the embodiment of the present utility model
In the figure, 1, rewinding the ring; 11. a rotating part; 12. a connection part; 13. a limiting piece; 14. a through hole; 15. a connecting piece; 17. an internal thread; 18. countersink; 2. a ratchet sleeve; 21. a fixing member; 22. a buckle; 3. a main body; 31. a buckle groove; 4. a plunger; 41. a clamping groove; 5. a torsion spring; 6. a cartridge.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
As shown in fig. 1 and 2, a rewinding structure of a pen-type injection device according to a preferred embodiment of the present utility model includes a rewinding ring 1 and a ratchet sleeve 2, the rewinding ring 1 and the ratchet sleeve 2 are disposed at the middle of the pen-type injection device, and the outer circumferential surface of a main body 3 of the pen-type injection device is flush with the maximum outer diameter of the rewinding ring 1, thereby ensuring the neat appearance of the pen-type injection device.
As shown in fig. 2 and 3, the rewinding ring 1 is sleeved on the outer circumferential surface of the cartridge 6, the rewinding ring 1 comprises a rotating part 11 and a connecting part 12 which are axially arranged, the rotating part 11 of the rewinding ring 1 is used for holding and rotating by a user, and the connecting part 12 is used for connecting the ratchet sleeve 2, the main body 3 of the pen-type injection device, the plunger and other parts; one end of the rotating part 11, which is opposite to the connecting part 12, is connected to the medicine cartridge 6 and can rotate along the axial direction of the medicine cartridge 6, a limiting piece 13 is arranged on the outer peripheral surface of the connecting part 12, a through hole 14 is arranged on one side end surface of the connecting part 12, which is opposite to the rotating part 11, a plunger 4 of the pen-type injection device is inserted into the through hole 14, a connecting piece 15 matched with the plunger 4 is arranged on the connecting part 12 so as to drive the plunger 4 to rotate, and the plunger 4 is inserted into the through hole 14 in the axial direction of the connecting part 12 and coaxially rotates with the rewinding ring 1 through the connecting piece 15.
The ratchet sleeve 2 is fixed on the main body 3 of the pen-type injection device, can keep fixed when the rewinding ring 1 rotates, the ratchet sleeve 2 is sleeved on the outer peripheral surface of the connecting part 12, the fixing piece 21 matched with the limiting piece 13 is arranged on the inner wall surface of the ratchet sleeve 2, the rotation angle of the rewinding ring 1 relative to the ratchet sleeve 2 can be limited in a certain range by the matching of the limiting piece 13 and the fixing piece 21, and the problem that the plunger 4 is overturned due to excessive rotation of the rewinding ring 1 and the empty stroke of the plunger 4 is caused by introduction can be avoided.
As shown in fig. 3 and 5, in some embodiments of the present utility model, the stopper 13 includes at least two ratchet teeth, the space between the two ratchet teeth is the maximum rotation angle of the fixing member 21, the maximum rotation angle of the fixing member 21 is matched with the maximum retraction distance of the plunger 4, and the maximum retraction distance of the plunger 4 can be changed by changing the distance between the two ratchet teeth to adapt to cartridges 6 of different lengths or different injection requirements; the fixing member 21 includes a stopper post that is matched with the size of the ratchet teeth, and the height of the stopper post is matched with the depth of the ratchet teeth, so that the stopper post cannot pass through the maximum rotation angle defined by the ratchet teeth, and it is ensured that the plunger 4 is always in a retreating stroke where no idle stroke occurs. Further, a plurality of stop posts can be arranged on the inner wall surface of the ratchet sleeve 2, so that the travel of the rewinding ring 1 in the ratchet sleeve 2 is further reduced, and different requirements are met. Preferably, ratchet teeth are provided at symmetrical ends of the outer peripheral surface of the connecting portion 12 of the rewind ring 1. In other embodiments of the utility model, the stop 13 may be a stop post and the retainer 21 may be ratchet teeth that mate with the stop post.
In some embodiments of the utility model, the ratchet teeth are elastic and extend towards the inside of the rewinding ring 1, the ratchet teeth extending towards the inside of the rewinding ring 1, conveniently when the rewinding ring 1 and the ratchet sleeve 2 are mounted; after the cartridge 6 is mounted, the gap between the cartridge 6 and the rewinding ring 1 is smaller than the elastic deformation size of the ratchet teeth, the ratchet teeth can be ejected from the rewinding ring 1, and the ejected ratchet teeth are matched with the positioning posts to limit the rewinding ring.
As shown in fig. 3 and 6, in some embodiments of the present utility model, the connecting member 15 includes a finger portion formed on an inner wall of the through hole 14, the finger portion extends toward the plunger 4, a clamping groove 41 facing the finger portion is formed on the plunger 4 along an axial direction of the plunger, the finger portion is clamped in the clamping groove 41, and the plunger 4 can be driven to rotate when the rewinding ring 1 rotates; the finger part is matched with the finger part, so that the finger part is firmly fixed in the clamping groove 41, the finger part is not easy to slide in the clamping groove 41, the stability of the device is ensured, and the accuracy of the backward stroke of the plunger 4 is also ensured. Further, the number of the fingers may be plural, the number of the fingers and the fingers may be plural, and the angle between the plurality of fingers may be plural to achieve the stable rewinding ring 1 and the plunger 4, which is not particularly limited herein.
Preferably, two symmetrically arranged finger parts are formed in the through hole 14, two clamping grooves 41 matched with the finger parts are respectively formed at two radial ends of the plunger 4, the two finger parts are clamped in the clamping grooves 41, the plunger 4 is fixed in two radial directions of the plunger 4, and the connection stability between the plunger 4 and the rewinding ring 1 is further ensured.
As shown in fig. 5 and 7, in some embodiments of the present utility model, a buckle 22 is disposed at an end of the ratchet sleeve 2 near the main body 3, the buckle 22 is disposed towards the main body 3, a buckle groove 31 is disposed at an end of the main body 3 near the ratchet sleeve 2, the buckle 22 is clamped in the buckle groove 31 when the ratchet sleeve 2 is fixed, and the buckle groove 31 is matched with the buckle 22 in size, so that the buckle 22 cannot move or rotate in the buckle groove 31, thereby ensuring that the ratchet sleeve 2 cannot rotate or move along with the ratchet sleeve when the rewinding ring 1 rotates, ensuring the position fixation of a stop post on the ratchet sleeve 2, and further ensuring the fixation of the rotation stroke of the rewinding ring 1.
In some embodiments of the present utility model, the ratchet sleeve 2 is provided with a plurality of buckles 22, the main body 3 is provided with a plurality of buckle grooves 31 matched with a plurality of buckles 22, and the plurality of buckles 22 are clamped in the corresponding buckle grooves 31, so that the ratchet sleeve 2 and the main body 3 are further ensured to be firmly fixed.
As shown in fig. 4, in some embodiments of the present utility model, the rotating part 11 is provided with an internal thread 17 toward one end of the cartridge 6, the cartridge 6 is provided with an external thread matching the internal thread 17, and the internal thread 17 and the external thread are provided so that the rewinding ring 1 can move in the axial direction when rotating, and remain fixed in the axial direction after rotating the rewinding ring 1 by a certain angle and stopping rotating, without slipping in the axial direction.
As shown in fig. 3 and 2, in some embodiments of the present utility model, a counter bore 18 is formed on an end surface of the connecting portion 12 facing the plunger 4, the counter bore 18 is used for fixing a torsion spring 5 of the pen-type injection device, the torsion spring 5 is disposed in a driving shaft of the pen-type injection device, and before the pen-type injection device works, the torsion spring 5 needs to store power; one end of the torsion spring 5 extends into the counter bore 18 to be fixed, and when the rewinding ring 1 rotates and moves towards the torsion spring 5, a certain force is applied to the torsion spring 5, so that the power-accumulating compression of the torsion spring 5 is completed.
A pen injection device according to a preferred embodiment of the utility model comprises a rewind structure according to any of the above embodiments. The pen-type injection device is provided with a rewinding ring 1 and a ratchet sleeve 2, the rewinding ring 1 is sleeved on the peripheral surface of a cartridge 6, a rotating part 11 of the rewinding ring 1 is used for holding and rotating by a user, a connecting part 12 is used for connecting the ratchet sleeve 2, a main body 3 of the pen-type injection device, a plunger 4 and other parts, and the plunger 4 is inserted into a through hole 14 in the axial direction of the connecting part 12 and coaxially rotates with the rewinding ring 1 through a connecting piece 15; the ratchet sleeve 2 is fixedly arranged relative to the rewinding ring 1 through the main body 3, the ratchet sleeve 2 is sleeved on the outer peripheral surface of the connecting part 12, the fixing part 21 is arranged on the inner wall surface of the ratchet sleeve, the connecting part 12 is provided with the limiting part 13 matched with the fixing part 21, the rotation angle of the rewinding ring 1 relative to the ratchet sleeve 2 can be limited in a certain range by the matching of the limiting part 13 and the fixing part 21, the problems that the plunger 4 is retreated too much and the empty stroke of the plunger 4 is caused by the excessive rotation of the rewinding ring 1 and the introduction are avoided, the accuracy of injection dosage is ensured, and the safety of patients is ensured.
The working process of the utility model is as follows: the rewinding ring 1 is sleeved on the outer peripheral surface of the medicine cartridge 6, a rotating part 11 of the rewinding ring 1 is used for holding and rotating by a user, a connecting part 12 is used for connecting the ratchet sleeve 2, the main body 3 of the pen-type injection device, the plunger 4 and other parts, the plunger 4 is inserted into a through hole 14 in the axial direction of the connecting part 12 and coaxially rotates with the rewinding ring 1 through a connecting piece 15; the ratchet sleeve 2 is fixedly arranged relative to the rewinding ring 1 through the main body 3, the ratchet sleeve 2 is sleeved on the outer peripheral surface of the connecting part 12, the fixing piece 21 is arranged on the inner wall surface of the ratchet sleeve 2, the limiting piece 13 matched with the fixing piece 21 is arranged on the connecting part 12, and the rotation angle of the rewinding ring 1 relative to the ratchet sleeve 2 can be limited in a certain range through the matching of the limiting piece 13 and the fixing piece 21.
In summary, the embodiment of the utility model provides a pen-type injection device and a rewinding structure thereof, which can not cause excessive backward movement of a plunger 4 due to excessive rotation of a rewinding ring 1 and cause the problem of empty stroke of the plunger 4 due to introduction, thereby ensuring the accuracy of injection dosage and the safety of patients.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (10)
1. A rewinding mechanism for a pen-type injection device, comprising:
the rewinding ring is sleeved on the outer peripheral surface of the medicine cartridge, the rewinding ring comprises a rotating part and a connecting part which are axially arranged, one end of the rotating part, which is opposite to the connecting part, is connected to the medicine cartridge, a limiting piece is arranged on the outer peripheral surface of the connecting part, a through hole is formed in the end surface, which is opposite to the rotating part, of the connecting part, a plunger of a pen-type injection device is inserted into the through hole, and the connecting part is provided with a connecting piece matched with the plunger so as to drive the plunger to rotate;
the ratchet sleeve is fixed on the main body of the pen-type injection device, the ratchet sleeve is sleeved on the outer peripheral surface of the connecting part, and a fixing piece matched with the limiting piece is arranged on the inner wall surface of the ratchet sleeve.
2. The pen injection device rewind structure of claim 1, wherein: the limiting piece comprises at least two ratchet teeth which are oppositely arranged, and the fixing piece comprises a stop post matched with the size of the ratchet teeth.
3. The pen injection device rewind structure of claim 2, wherein: the ratchet teeth are resilient members and extend towards the inside of the rewind ring, the gap between the cartridge and the rewind ring being smaller than the size of the resilient deformation of the ratchet teeth.
4. The pen injection device rewind structure of claim 1, wherein: the connecting piece comprises a finger part formed on the inner wall of the through hole, and a clamping groove matched with the finger part is formed on the plunger along the axial direction of the plunger.
5. The pen injection device rewind structure of claim 4, wherein: two finger parts which are symmetrically arranged are formed in the through hole, and two clamping grooves matched with the finger parts are respectively formed at two radial ends of the plunger.
6. The pen injection device rewind structure of claim 1, wherein: the ratchet sleeve is provided with a buckle at one end close to the main body, and a clamping groove matched with the buckle is formed at one end of the main body close to the ratchet sleeve.
7. The pen injection device rewind structure of claim 6, wherein: the ratchet sleeve is provided with a plurality of buckles, and the main body is provided with a plurality of clamping grooves matched with a plurality of buckles.
8. The pen injection device rewind structure of claim 1, wherein: the rotating part is provided with an internal thread towards one end of the cartridge, and an external thread matched with the internal thread is arranged on the cartridge.
9. The pen injection device rewind structure of claim 1, wherein: and a torsion spring for fixing the pen-type injection device is arranged on one side end surface of the connecting part, which faces the plunger, and the torsion spring is arranged in a driving shaft of the pen-type injection device.
10. A pen injection device comprising a rewind structure according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221729667.1U CN218923442U (en) | 2022-07-06 | 2022-07-06 | Pen type injection device and rewinding structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221729667.1U CN218923442U (en) | 2022-07-06 | 2022-07-06 | Pen type injection device and rewinding structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218923442U true CN218923442U (en) | 2023-04-28 |
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ID=86086424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221729667.1U Active CN218923442U (en) | 2022-07-06 | 2022-07-06 | Pen type injection device and rewinding structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218923442U (en) |
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2022
- 2022-07-06 CN CN202221729667.1U patent/CN218923442U/en active Active
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