Guide mechanism suitable for medicine injection device and medicine injection device
By setting a sliding fit between the sleeve and the locking sleeve of the drug injection device with a chuck and a limiting rib, the problem of abnormal noise during the movement of the guiding mechanism is solved, and a smooth and stable injection process is achieved.
Patent Information
- Application Number
- CN202422648356.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The guiding mechanism of existing drug injection devices is prone to shaking or wobbling during movement, which can produce abnormal noises.
It adopts a sleeve and locking cylinder structure. The inner wall of the sleeve is provided with claws and guide grooves, and the locking cylinder is provided with clearance grooves and limiting ribs. The sliding fit avoids abnormal noise. The claws are designed with inclined surfaces to reduce collisions. There are multiple claws and limiting ribs that correspond one-to-one. The sleeve is fitted on the outside of the locking cylinder.
It effectively avoids abnormal noises during the injection process, ensures smooth and stable gliding, reduces noise caused by external influences, and improves the user experience.
Smart Images
Figure CN223542256U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automatic injection technology, and specifically relates to a guide mechanism and a drug injection device suitable for drug injection devices. Background Technology
[0002] Traditional drug injection devices are generally divided into two categories: manual injectors and automatic injectors. In traditional manual injectors, the user applies external force by pressing the plunger to propel the medication out of the device. For untrained personnel, controlling details such as injection force, duration, and angle is not easy to master quickly, and can easily cause discomfort to the recipient. Therefore, automatic injectors were developed as a self-use medical device that can be easily used by general patients or non-medical personnel.
[0003] Existing autoinjectors typically use a pre-loaded drive elastic element as a power source. The injection mechanism is simply installed onto the injection site of the guide mechanism. The sleeve and locking cylinder in the guide mechanism are restricted from relative movement by a limiting mechanism, at which point the drive elastic element is in a compressed state. In use, the tip of the autoinjector is positioned at the patient's injection site. The user simply triggers the limiting mechanism to release the restriction on the guide mechanism, activating the autoinjector. The drive elastic element then drives the sleeve and locking cylinder to move relative to each other. Driven by the drive elastic element, the plunger of the injection mechanism quickly pierces the skin with the needle, and the medication is automatically injected through the needle. This design not only simplifies the injection process but also reduces the risks caused by improper operation.
[0004] However, the existing guiding mechanism uses two sleeve structures to achieve guiding movement, which is prone to shaking or wobbling during the movement, producing abnormal noise.
[0005] Therefore, how to overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0006] The purpose of this invention is to provide a guide mechanism and a drug injection device suitable for drug injection devices, which can effectively prevent abnormal noises during injection.
[0007] To solve the above-mentioned technical problems, this utility model provides a guide mechanism suitable for a drug injection device, including a sleeve and a locking cylinder. The sleeve can restrict the rotation of the locking cylinder to avoid the locking cylinder from making unexpected abnormal noises when it moves axially.
[0008] Before use, the sleeve and the locking cylinder are restricted from moving relative to each other by a limiting mechanism. When the limiting mechanism is released, the sleeve and the locking cylinder can be driven to move relative to each other by the driving elastic element in the drug injection device. The sleeve is characterized by having a claw on its inner wall and a guide groove on the claw. The locking cylinder is provided with a relief groove for avoiding the claw and a limiting rib connected to both ends of the relief groove. The sleeve is sleeved on the outside of the locking cylinder, and the limiting rib is used to slide with the guide groove.
[0009] Optionally, in the above-described guide mechanism for drug injection devices, the chuck has an inclined surface on the side facing the injection direction.
[0010] Optionally, in the above-described guide mechanism for drug injection devices, the pawl is an elastic cantilever mounted on the sleeve.
[0011] Optionally, in the above-mentioned guide mechanism applicable to drug injection devices, the sleeve and the jaw are integrally formed, or the sleeve and the jaw are separate and detachably connected.
[0012] Optionally, in the above-mentioned guide mechanism applicable to drug injection devices, the claw, the guide groove, the clearance groove, and the limiting rib are multiple in a one-to-one correspondence.
[0013] Optionally, in the above-described guide mechanism for a drug injection device, a plurality of the claws are symmetrically arranged circumferentially along the inner wall of the sleeve, and a plurality of the clearance grooves are symmetrically arranged circumferentially along the locking cylinder.
[0014] This utility model provides a drug injection device, including a shell, an inner tube, an injection mechanism, a driving elastic element, and a guiding mechanism as described above for a drug injection device.
[0015] The two ends of the driving elastic element are respectively connected to the push rod of the injection mechanism and the locking cylinder.
[0016] Optionally, in the above-mentioned drug injection device, the outer wall of the housing is provided with a boss.
[0017] Optionally, in the above-described drug injection device, the bosses are a plurality of those arranged symmetrically along the circumference of the housing.
[0018] Optionally, in the above-mentioned drug injection device, the housing is a polygonal cylindrical structure.
[0019] Optionally, in the above-mentioned drug injection device, the driving elastic element is a spring.
[0020] This utility model provides a guide mechanism suitable for drug injection devices, which has the following advantages:
[0021] The sleeve is fitted onto the outside of the lock cylinder, and the claws on the sleeve are provided with guide grooves. The lock cylinder has a clearance groove for avoiding the claws, and a limiting rib is provided on the clearance groove. The claws on the sleeve are placed in the clearance groove of the lock cylinder, and the guide grooves on the claws and the limiting rib of the lock cylinder slide in a sliding engagement. When the sleeve and the lock cylinder move relative to each other, the concave and convex engagement of the guide grooves on the claws and the limiting rib makes the sliding between the sleeve and the lock cylinder smoother and more stable, unaffected by external parts, and effectively avoids abnormal noises during injection.
[0022] This utility model also provides a drug injection device, including the above-mentioned guide mechanism suitable for drug injection devices, which has the same beneficial effects, and will not be described in detail here. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0024] Figure 1 A schematic diagram of a guide mechanism suitable for a drug injection device provided in an embodiment of this utility model;
[0025] Figure 2 for Figure 1 Schematic diagram of the cross section along the AA direction;
[0026] Figure 3 for Figure 1 A schematic diagram of the axial cross-section;
[0027] Figure 4 A schematic diagram of the sleeve provided in an embodiment of this utility model;
[0028] Figure 5 A schematic diagram of the structure of the lock cylinder provided in an embodiment of this utility model;
[0029] Figure 6 This is a schematic diagram of the appearance of the drug injection device provided in an embodiment of the present invention.
[0030] In the image above:
[0031] 100 - Sleeve; 110 - Claw; 111 - Guide groove;
[0032] 200 - Lock cylinder; 210 - Clearance groove; 220 - Limiting rib;
[0033] 300 - Housing; 310 - Boss. Detailed Implementation
[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0035] The core of this invention is to provide a guide mechanism and a drug injection device suitable for drug injection devices, which can effectively prevent abnormal noises during injection.
[0036] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0037] For details, please refer to Figures 1-6 The present invention provides a guide mechanism suitable for drug injection devices, including a sleeve 100 and a locking sleeve 200.
[0038] The locking cylinder 200 is the main actuating component that issues a warning signal after the injection mechanism has finished injecting. The sleeve 100 serves to fix the push rod of the injection mechanism in the initial assembly state and to release the limiting mechanism when injection is needed, allowing the push rod to automatically inject under the action of the driving elastic element. The sleeve 100 can limit the rotation of the locking cylinder 200 to avoid unexpected abnormal noises when the locking cylinder 200 moves axially.
[0039] Before use, the sleeve 100 and the locking sleeve 200 are restricted from moving relative to each other by a limiting mechanism. When the limiting mechanism is released, the sleeve 100 and the locking sleeve 200 can be driven to move relative to each other by the driving elastic element in the drug injection device.
[0040] Since the main structure of the sleeve 100 and the locking cylinder 200 is existing technology, the sleeve is the release ring mentioned in the prior art, the locking cylinder is the rattle mentioned in the prior art, and the housing is the housing mentioned in the prior art. This solution is an improvement on the existing basis. Therefore, the structure of the sleeve 100 and the locking cylinder 200 other than the improvement points will not be described in detail.
[0041] The inner wall of the sleeve 100 is provided with a claw 110, and a guide groove 111 is provided on the claw 110. The locking cylinder 200 is provided with a relief groove 210 for avoiding the claw 110 and a limiting rib 220 connected to both ends of the relief groove 210. The sleeve 100 is sleeved on the outer side of the locking cylinder 200, and the limiting rib 220 is used to slide with the guide groove 111.
[0042] The guiding mechanism provided in this solution for a drug injection device has a sleeve 100 fitted onto the outside of a locking cylinder 200. The sleeve 100 has a guide groove 111 on its claw 110, and the locking cylinder 200 has a clearance groove 210 for avoiding the claw 110. A limiting rib 220 is provided on the clearance groove 210. The claw 110 on the sleeve 100 is positioned within the clearance groove 210 of the locking cylinder 200, and the guide groove 111 on the claw 110 slides in engagement with the limiting rib 220 of the locking cylinder 200. When the sleeve 100 and the locking cylinder 200 move relative to each other, the interlocking of the guide groove 111 of the claw 110 and the limiting rib 220 makes the sliding between the sleeve 100 and the locking cylinder 200 smoother and more stable, unaffected by external components, and effectively prevents abnormal noises during injection.
[0043] To prevent large-area contact and collision between the chuck 110 and the clearance groove 210 of the locking cylinder 200, the side of the chuck 110 facing the injection direction can be designed as an inclined surface. This design can avoid generating large abnormal noises and also prevent vibrations caused by contact between components.
[0044] In a specific embodiment, the chuck 110 is an elastic cantilever mounted on the sleeve 100. In one form, the sleeve 100 and the chuck 110 are integrally formed, for example, by injection molding or integral machining of a metal part. In another form, the sleeve 100 and the chuck 110 are separately fixedly connected, for example, the chuck 110 is welded to the sleeve 100, or when the chuck 110 is made of plastic, it can be connected to the sleeve 100 by adhesive.
[0045] In a specific embodiment, the claws 110, guide grooves 111, clearance grooves 210, and limiting ribs 220 are multiple in a one-to-one correspondence, which can improve the stability of the guide. Multiple of the above-mentioned guide components can be evenly arranged on the corresponding sleeves 100 and locking cylinders 200. Specifically, multiple claws 110 are symmetrically arranged circumferentially along the inner wall of the sleeve 100, and multiple clearance grooves 210 are symmetrically arranged circumferentially along the locking cylinder 200.
[0046] Furthermore, this utility model also provides a drug injection device, including a housing 300, an inner tube, an injection mechanism, a driving elastic element, and a guiding mechanism suitable for a drug injection device as described in the above specific embodiments. The two ends of the driving elastic element are respectively connected to the push rod and the locking cylinder 200 of the injection mechanism.
[0047] The housing 300 serves as the main support and protective component of the entire drug injection device, used to fix the injection mechanism, drive elastic element, inner tube, guide mechanism, and other components. It also provides space for the installation and operation of other components. The front end of the housing 300 has an opening to facilitate the extension of the needle from the injection mechanism. For example, the housing 300 can be a hollow cylindrical structure, or it can be ergonomically designed to be more comfortable for the hand to hold.
[0048] The injection mechanism contains the drug to be injected and is coaxially and slidably arranged within the housing 300. Specifically, it includes a syringe, a piston, and a plunger. The plunger is the main component that pushes the piston to achieve automatic injection. A driving elastic element acts on the plunger and drives it to slide towards the front end of the syringe, thus enabling the plunger to perform automatic injection under the action of the driving elastic element. Simultaneously, the driving elastic element and the plunger can be maintained in their initial assembled state by other limiting components to prevent the drug solution in the syringe from being ejected when injection is not needed.
[0049] Obviously, drug injection devices that include the aforementioned guide mechanism suitable for drug injection devices have the same beneficial effects, which will not be elaborated here.
[0050] To prevent the drug injection device from rolling when not in use, such as when placed on a table, in one embodiment, the outer wall of the housing 300 is provided with bosses 310. Multiple bosses 310 are symmetrically arranged circumferentially around the housing 300. In the above embodiment, the bosses 310 serve as an anti-rollover structure, preventing rolling and allowing the cylindrical housing 300 to roll freely. In another embodiment, the housing 300 is a polygonal cylindrical structure, and the planes on the polygonal cylindrical structure can be placed stably on a table.
[0051] In a specific embodiment, the driving elastic element is a spring. When the sleeve 100 is released, the spring pushes the push rod forward for injection. As the push rod moves in the injection direction, the spring is gradually exposed. During the process of the spring releasing its elastic force, there will be outward collision due to twisting and deformation. Due to the guide mechanism in this case, the spring can be prevented from colliding with the claw 110 on the sleeve 100 exposed at the avoidance groove 210 of the locking cylinder 200. In other words, the limiting rib 220 at the avoidance groove 210 of the locking cylinder 200 can block part of the spring's collision, thereby avoiding abnormal noise during the injection process.
[0052] In the description of this application, it should be understood that the front end in this solution refers to the end of the drug injection device that faces the human body for injection when in use, that is, the end of the drug injection device where the needle is located; the rear end in this solution is opposite to the aforementioned front end, that is, the other end of the autoinjector opposite to the front end.
[0053] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.
[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0055] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A guide mechanism for a drug injection device, comprising a sleeve (100) and a locking cylinder (200), wherein the sleeve (100) is capable of restricting the locking cylinder (200) from rotating to prevent the locking cylinder (200) from making unpredictable noises during axial movement; Before use, the sleeve (100) and the locking sleeve (200) are restricted from relative movement by a limiting mechanism. When the limiting mechanism is released, the sleeve (100) and the locking sleeve (200) can be driven to move relative to each other by the driving elastic element in the drug injection device. The characteristic of this device is that... The inner wall of the sleeve (100) is provided with a claw (110), and a guide groove (111) is provided on the claw (110). The locking cylinder (200) is provided with a relief groove (210) for avoiding the claw (110) and a limiting rib (220) connected to both ends of the relief groove (210) in the axial direction. The sleeve (100) is sleeved on the outside of the locking cylinder (200), and the limiting rib (220) is used to slide with the guide groove (111).
2. The guide mechanism for a drug injection device according to claim 1, characterized in that, The claw (110) has an inclined surface on the side facing the injection direction.
3. The guide mechanism for a drug injection device according to claim 1, characterized in that, The chuck (110) is an elastic cantilever mounted on the sleeve (100).
4. The guide mechanism for a drug injection device according to claim 3, characterized in that, The sleeve (100) and the claw (110) are integrally formed, or the sleeve (100) and the claw (110) are separately fixedly connected.
5. The guide mechanism for a drug injection device according to claim 1, characterized in that, The claw (110), the guide groove (111), the clearance groove (210), and the limiting rib (220) are multiple in a one-to-one correspondence.
6. The guide mechanism for a drug injection device according to claim 5, characterized in that, Multiple claws (110) are symmetrically arranged circumferentially along the inner wall of the sleeve (100), and multiple clearance grooves (210) are symmetrically arranged circumferentially along the locking cylinder (200).
7. A drug injection device, characterized in that, It includes a housing (300), an inner tube, an injection mechanism, a drive elastic element, and a guide mechanism suitable for a drug injection device as described in any one of claims 1-6; The two ends of the driving elastic element are respectively connected to the push rod of the injection mechanism and the locking cylinder (200).
8. The drug injection device according to claim 7, characterized in that, The outer wall of the housing (300) is provided with a boss (310).
9. The drug injection device according to claim 8, characterized in that, The bosses (310) are a plurality of those arranged symmetrically along the circumference of the housing (300).
10. The drug injection device according to claim 7, characterized in that, The shell (300) is a polygonal cylindrical structure.
11. The drug injection device according to claim 7, characterized in that, The driving elastic element is a spring.