CN219185312U - Medical injection device and tool-free disassembly and assembly needle protection mechanism thereof - Google Patents

Abstract

The utility model discloses a tool-free disassembly and assembly needle protection mechanism, which comprises a needle protection sleeve which is arranged in a front extension cylinder of an injection pen container and is sleeved on a needle head of a pre-filling and sealing injector in a ring mode, and also comprises a cap assembly which is detachably connected to the front end of the injection pen container, wherein the cap assembly comprises a middle through pipe which is slidably inserted into the front extension cylinder, and a plurality of convex angles which are distributed along the circumferential direction and used for clamping the outer wall surface of the needle protection sleeve are arranged on the inner wall of the middle through pipe. Therefore, the clamping effect of the convex angle in the cap assembly on the outer wall of the needle guard sleeve is utilized, after the cap assembly is inserted into the injection pen container, the cap assembly and the needle guard sleeve are connected into a whole, and when an injection device is needed to be used, the needle guard sleeve can be conveniently removed along the belt when the cap assembly is removed through simple pulling operation of the cap assembly, so that compared with the prior art, the operation method and the product structure of medical staff can be simplified, and the production cost is reduced. The utility model also discloses a medical injection device, which has the beneficial effects as described above.

Description

Medical injection device and tool-free disassembly and assembly needle protection mechanism thereof

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a tool-free disassembly and assembly needle protection mechanism.

The utility model also relates to a medical injection device.

Background

With the development of medical technology, a wide variety of medical devices have been widely used.

The injection device is a common interventional therapy device and is mainly used for injecting injection liquid into a human body through organs such as skin and the like. Unlike conventional syringes, the injection device needs to be used with a sealed pre-filled syringe, i.e., to form a package and shield for the syringe.

Currently, needle shields are provided on the needle of pre-filled syringes to maintain sterility of the syringe contents-keeping the syringe contents sterile until the medical specification is reached before administration. To ensure tightness, a cap is usually provided on the injection device, so that if the needle shield is to be removed, the cap must first be removed from the injection device, so that after the needle shield is exposed, the needle shield is removed from the needle of the syringe. If the syringe is stored for a long time before use, it is difficult to remove the needle guard from the syringe and a large force is required. Meanwhile, the needle guard is located at a deeper position in the injection device, and after the cap is taken off, the needle guard is often required to be stretched into the injection device by means of tools such as forceps, clamps and the like to operate, and the needle guard is difficult to take out due to narrow operation space and insufficient visual field.

In the prior art, some injection devices have been modified to bring the cap into a connecting relationship with the needle shield so that the needle shield can be removed from the needle by the way the cap is removed. In general, the cap is provided with an end cover plate, a baffle plate and other components, and when the cap is inserted into the injection device, the end cover plate is abutted against the inner end face of the needle protection sleeve, so that the needle protection sleeve can be driven to be pulled out from the needle when the cap is pulled out.

However, the inner end face area of the partial needle protection sleeve is smaller and is tightly abutted against the outer wall of the injector, so that no gap or a small gap exists between the inner end of the needle protection sleeve and the outer wall of the injector, parts such as an end cover plate and the like cannot be inserted into the gap between the inner end of the needle protection sleeve and the outer wall of the injector, and further the end cover plate cannot be abutted against the inner end face of the needle protection sleeve, the needle protection sleeve is difficult to be smoothly pulled out, the structure of the injection device is complex, and the product cost is increased.

Therefore, how to conveniently remove the needle protection sleeve together when removing the cap, simplify the operation method and the product structure of medical staff, reduce the production cost and solve the technical problem faced by the technical staff in the field.

Disclosure of Invention

The utility model aims to provide a tool-free needle protection mechanism capable of conveniently removing a needle protection sleeve along with a cap when removing the cap, simplifying the operation method and the product structure of medical staff and reducing the production cost. It is a further object of the present utility model to provide a medical injection device.

In order to solve the technical problems, the utility model provides a tool-free disassembly and assembly needle protection mechanism, which comprises a needle protection sleeve which is arranged in a forward extending cylinder of an injection pen container and is sleeved on a needle head of a prefilled syringe, and further comprises a cap assembly which is detachably connected to the front end of the injection pen container, wherein the cap assembly comprises a middle through pipe which is slidably inserted into the forward extending cylinder, and a plurality of convex angles which are distributed along the circumferential direction and are used for clamping the outer wall surface of the needle protection sleeve are arranged on the inner wall of the middle through pipe.

Preferably, the outer wall surface of the needle protection sleeve is provided with a plurality of grooves which are distributed along the circumferential direction and are used for being in clamping fit with the convex angle.

Preferably, the end of the lobe facing the needle guard is pointed.

Preferably, each of the convex corners is distributed in the inner end area of the middle through pipe.

Preferably, each lobe is axially distributed with a plurality of turns on the inner wall of the middle tube.

Preferably, the wall of the middle through pipe is an elastic wall.

Preferably, the cap assembly further comprises a cover body which is sleeved on the outer wall of the front extension cylinder in a pluggable mode, a limiting protrusion is arranged on the inner end face of the cover body in an extending mode, and the limiting protrusion is used for being clamped with a limiting groove formed in the front end face of the injection pen container.

Preferably, the limit protrusion is provided with an indication mark for indicating the direction of removal of the cap assembly.

Preferably, concave-convex lines for enhancing friction force are arranged on the outer wall of the cover body.

The utility model also provides a medical injection device, which comprises an injection pen container, a pre-filled and sealed injector arranged in the injection pen container, and a tool-free disassembly and assembly needle protection mechanism arranged on the injection pen container, wherein the tool-free disassembly and assembly needle protection mechanism is specifically any one of the tool-free disassembly and assembly needle protection mechanisms.

The utility model provides a tool-free disassembly and assembly needle protection mechanism which mainly comprises a needle protection sleeve and a cap assembly. The needle protection sleeve is arranged in the injection pen container, is particularly positioned in the front extension cylinder at the front end of the injection pen container, is sleeved on the needle of the prefilled syringe accommodated in the injection pen container, and is mainly used for protecting and sealing the needle of the prefilled syringe, so that the content of the prefilled syringe is always maintained in a sterile state. The cap assembly is connected to the front end of the injection pen container and is detachably connected with the injection pen container, and is mainly used for protecting the front end of the injection pen container and the needle protection sleeve. The cap assembly mainly comprises a middle through pipe and a convex angle, wherein the middle through pipe is in an internally conducted tubular shape and is mainly used for being inserted into a front extension cylinder of an injection pen container, and is sleeved on the outer wall of a needle protection sleeve in the front extension cylinder in a ring mode, and meanwhile the middle through pipe is in sliding connection with the front extension cylinder, so that the middle through pipe can axially slide in the front extension cylinder. The salient angle sets up on the inner wall of well siphunculus, is provided with a plurality ofly generally simultaneously, and each salient angle distributes along well siphunculus's circumference direction, and mainly used carries out the chucking to the outer wall surface of needle protection cover on well siphunculus ring cover needle protection cover's basis, and each salient angle in circumference carries out the chucking to the different regions of the outer wall surface of needle protection cover simultaneously, has realized in the whole hoop, the clamping effect of well siphunculus to the needle protection cover to be connected as an organic wholely with well siphunculus, and then be connected as an organic wholely with needle protection cover and cap subassembly.

Therefore, according to the tool-free disassembly and assembly needle protection mechanism provided by the utility model, the cap assembly and the needle protection sleeve are connected into a whole by utilizing the clamping effect of each convex angle on the inner wall of the middle through pipe in the cap assembly on the outer wall of the needle protection sleeve after the cap assembly is inserted into the injection pen container, so that when a medical staff needs to use an injection device, the needle protection sleeve can be conveniently removed along with the cap when the cap is removed through the simple pulling-out operation of the middle through pipe in the cap assembly, and compared with the prior art, the tool-free disassembly and assembly needle protection mechanism can simplify the operation method and the product structure of the medical staff, and reduce the production cost.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Fig. 2 is a schematic view of a structure in which a needle sheath is removed according to an embodiment of the present utility model.

Fig. 3 is a partial structural cross-sectional view of fig. 1.

Fig. 4 is a schematic view showing a specific structure of the cap assembly.

Fig. 5 is a front view of the cap assembly.

Fig. 6 is a half cross-sectional view of the cap assembly.

Fig. 7 is a schematic diagram showing a specific structure of the groove on the needle guard.

Fig. 8 is a schematic diagram of a mating structure of the convex corner and the groove.

Wherein, in fig. 1-8:

an injection pen container-1, a prefilled syringe-2, a needle protection sleeve-3 and a cap assembly-4;

the device comprises a front extension cylinder-11, a limit groove-12, a needle head-21, a groove-31, a middle through pipe-41, a convex angle-42, a cover body-43, a limit protrusion-44, an indication mark-45 and a concave-convex line-46.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and 2, fig. 1 is a schematic overall structure of an embodiment of the present utility model, and fig. 2 is a schematic structure of a needle shield 3 removed in an embodiment of the present utility model.

In one embodiment of the present utility model, the tool-less removable needle guard mechanism basically comprises a needle guard 3 and a cap assembly 4.

The needle protection sleeve 3 is arranged in the injection pen container 1, is particularly positioned in the front extension barrel 11 at the front end of the injection pen container 1, and is also sleeved on the needle 21 of the pre-filled and sealed syringe 2 accommodated in the injection pen container 1, and is mainly used for protecting and sealing the needle 21 of the pre-filled and sealed syringe 2, so that the content of the pre-filled and sealed syringe 2 is always maintained in a sterile state.

The cap assembly 4 is connected to the front end of the injection pen container 1 and forms a detachable connection with the injection pen container 1, and is mainly used for protecting the front end of the injection pen container 1 and the needle protection sleeve 3.

The cap assembly 4 mainly includes a middle tube 41 and a lobe 42.

The middle through pipe 41 is in an internally conducted tubular shape, and is mainly used for being inserted into the front extension barrel 11 of the injection pen container 1, and is sleeved on the outer wall of the needle protection sleeve 3 in the front extension barrel 11 in a ring mode, and meanwhile, the middle through pipe 41 is in sliding connection with the front extension barrel 11, so that the middle through pipe 41 can axially slide in the front extension barrel 11.

The lobe 42 sets up on the inner wall of well siphunculus 41, is provided with a plurality ofly generally simultaneously, and each lobe 42 distributes along well siphunculus 41's circumference direction, mainly used carries out the chucking to the outer wall surface of needle guard 3 on the basis of well siphunculus 41 ring cover needle guard 3, and each lobe 42 in circumference carries out the chucking to the different regions of the outer wall surface of needle guard 3 simultaneously, has realized in the whole hoop, the clamping effect of well siphunculus 41 to needle guard 3 to connect needle guard 3 and well siphunculus 41 as an organic whole, and then connect needle guard 3 and cap subassembly 4 as an organic whole.

In this way, the tool-free disassembly and assembly needle protection mechanism provided by the embodiment utilizes the clamping effect of each convex angle 42 on the inner wall of the middle through pipe 41 in the cap assembly 4 on the outer wall of the needle protection sleeve 3, after the cap assembly 4 is inserted into the injection pen container 1, the cap assembly 4 and the needle protection sleeve 3 are connected into a whole, when a medical staff needs to use the injection device, the needle protection sleeve 3 can be conveniently removed along with the belt when the cap is removed through the simple pulling operation of the middle through pipe 41 in the cap assembly 4, and compared with the prior art, the operation method and the product structure of the medical staff can be simplified, and the production cost is reduced.

As shown in fig. 3, 7 and 8, fig. 3 is a partial structural cross-sectional view of fig. 1, fig. 7 is a specific structural schematic view of the groove 31 on the needle guard 3, and fig. 8 is a schematic view of the cooperation structure of the lobe 42 and the groove 31.

To increase the clamping degree of each convex corner 42 on the needle guard 3, a groove 31 is added in the embodiment. Specifically, the grooves 31 are formed on the outer wall surface of the needle guard 3, and generally a plurality of grooves 31 are formed on the outer wall surface of the needle guard 3 at the same time, and the distribution form of each groove 31 on the outer wall surface of the needle guard 3 corresponds to the distribution form of each convex corner 42 on the inner wall surface of the middle through pipe 41, that is, each groove 31 is distributed along the circumferential direction of the needle guard 3, and one groove 31 corresponds to one submission, and the corresponding groove 31 and the convex corner 42 form a clamping fit. When the middle through pipe 41 is inserted into the forward extending barrel 11 of the injection pen container 1, each convex angle 42 on the inner wall of the middle through pipe 41 is clamped into each corresponding groove 31 on the needle protecting sleeve 3, so that the connection stability between the middle through pipe 41 and the needle protecting sleeve 3 is improved by the clamping fit of the grooves 31 and the convex angles 42.

To further enhance the clamping force of the protruding corner 42 against the outer wall surface or the groove 31 of the needle shield 3, in this embodiment, the end of the protruding corner 42 facing the needle shield 3 is specifically a tip, such as a triangle or the like. Of course, the shape of the lobes 42 is not limited to triangular, and other shapes with pointed ends may be used.

Based on the same considerations, in this embodiment, the wall of the middle tube 41 is specifically an elastic wall, and may be elastically contracted or expanded in the circumferential direction. When the middle through pipe 41 is inserted into the forward extending cylinder 11, the pipe wall of the middle through pipe 41 can be elastically expanded through the contact between the convex angle 42 and the outer wall of the needle protection sleeve 3, so that elastic pre-tightening force is formed on the needle protection sleeve 3 by utilizing the elastic potential energy of the middle through pipe 41, and the clamping force of the convex angle 42 on the outer wall of the needle protection sleeve 3 is enhanced or the clamping force of the middle through pipe 41 on the needle protection sleeve 3 is enhanced under the action of the elastic pre-tightening force.

Typically, each lobe 42 is distributed in an inner end region (or inner end region) of the middle tube 41, and each lobe 42 may be uniformly distributed along the circumferential direction of the middle tube 41. Correspondingly, the respective recess 31 is also provided in the region of the inner end of the outer wall of the needle shield 3, generally at the root of the needle 21.

Further, each of the lobes 42 may be distributed not only at the same axial position (forming one turn distribution), but also on the inner wall thereof along the axial direction of the middle tube 41, for example, 2 to 4 turns, etc. So set up, a plurality of salient angles 42 form the joint to the different regions of the outer wall surface of needle sheath 3 simultaneously, have not only improved chucking power, have balanced the distribution of chucking power yet.

As shown in fig. 4, 5, and 6, fig. 4 is a schematic view of a specific structure of the cap assembly 4, fig. 5 is a front view of the cap assembly 4, and fig. 6 is a half sectional view of the cap assembly 4.

In an alternative embodiment with respect to the cap assembly 4, the cap assembly 4 includes a cap body 43 and a stopper protrusion 44 in addition to the above-described middle tube 41 and the convex corner 42.

Wherein the cover 43 is a main body structure or an outer layer structure of the cap assembly 4, and the middle tube 41 is a center structure of the cap assembly 4. Generally, the cover 43 is U-shaped, and the middle tube 41 is disposed in a central axis area of the cover 43. When the cap assembly 4 is mounted to the injection pen container 1, the inner circumferential surface of the cover 43 is fitted around the outer wall of the forward-extending barrel 11 and is slidably coupled to the forward-extending barrel 11, thereby facilitating the sliding insertion and extraction operation of the cover 43 on the forward-extending barrel 11.

The limit protrusion 44 is disposed on the inner end surface of the cover 43 and extends toward the injection pen container 1 to form a protruding structure, such as an inverted U-shape or a rectangular shape. Correspondingly, the front end surface of the injection pen container 1 is provided with a limit groove 12, and the limit protrusion 44 is mainly used for forming clamping fit with the limit groove 12, so that when the cap assembly 4 is not pulled out, the degree of freedom of the rotation movement of the cover 43 on the forward extending barrel 11 is limited, the cover 43 is prevented from rotating due to external force, and the internal middle through pipe 41, the needle protecting sleeve 3 and the needle 21 are further caused to rotate. In general, the limit projection 44 may be provided only in one or a plurality thereof may be provided on the inner end surface along the circumferential direction of the cover 43.

Further, in order to facilitate indication of the direction of the force applied to the cap assembly 4 by the medical staff when using the injection device, the present embodiment further provides an indication mark 45 on the limit protrusion 44. In particular, the indication mark 45 may be an arrow mark, and the arrow direction thereof is directed away from the axial direction of the injection pen container 1, so that the force application position and the force application direction of the medical staff when the cap assembly 4 is removed can be clearly indicated.

Furthermore, in order to facilitate the medical staff to apply force to pull out the cap assembly 4, the outer wall of the cover 43 is provided with concave-convex lines 46 in this embodiment, so that the friction force between the fingers of the medical staff and the outer wall is enhanced by the characteristics of the concave-convex lines 46.

The embodiment also provides a medical injection device, which mainly comprises an injection pen container 1, a prefilled syringe 2 arranged in the injection pen container 1, and a tool-free disassembly and assembly needle protection mechanism arranged on the injection pen container 1, wherein the specific content of the tool-free disassembly and assembly needle protection mechanism is the same as the related content, and the detailed description is omitted here.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a needle mechanism is protected in tool-less dismouting, includes interior in the preceding section of thick bamboo (11) of injection pen container (1) and around cover needle protection cover (3) on syringe needle (21) of embedment syringe (2), its characterized in that still including detachably connect in cap subassembly (4) of the front end of injection pen container (1), cap subassembly (4) including slidable insert locate well siphunculus (41) in preceding section of thick bamboo (11), be provided with a plurality of along circumference distribution on the inner wall of well siphunculus (41), be used for the chucking lobe (42) of the outer wall surface of needle protection cover (3).

2. The tool-free disassembly and assembly needle protection mechanism according to claim 1, wherein a plurality of grooves (31) which are distributed along the circumferential direction and are used for forming clamping fit with the convex corners (42) are formed on the outer wall surface of the needle protection sleeve (3).

3. Tool-less removal and installation needle protection mechanism according to claim 1, characterized in that the end of the lobe (42) facing the needle protection sleeve (3) is pointed.

4. Tool-less removal needle protection mechanism according to claim 1, wherein each of the lobes (42) is distributed in the inner end region of the middle tube (41).

5. Tool-less disassembly needle protection mechanism according to claim 1, characterized in that each of the lobes (42) is axially distributed with a plurality of turns on the inner wall of the middle tube (41).

6. Tool-less safety needle mechanism according to any of claims 1-5, wherein the wall of the middle tube (41) is an elastic wall.

7. The tool-free disassembly needle protection mechanism according to claim 1, wherein the cap assembly (4) further comprises a cover body (43) which is sleeved on the outer wall of the front extension barrel (11) in a pluggable mode, a limiting protrusion (44) is arranged on the inner end face of the cover body (43) in an extending mode, and the limiting protrusion (44) is used for being clamped with a limiting groove (12) formed in the front end face of the injection pen container (1).

8. The tool-less set-down needle guard mechanism of claim 7, wherein the limit projection (44) is provided thereon with an indication mark (45) for indicating a pull-out direction of the cap assembly (4).

9. The tool-less removable needle guard mechanism of claim 7, wherein the outer wall of the cover (43) is provided with a relief pattern (46) for enhancing friction.

10. A medical injection device, includes injection pen container (1), embeds in advance embedment syringe (2) in injection pen container (1), and set up in the needle mechanism is protected in the dismouting of exempting from to tool on injection pen container (1), its characterized in that, needle mechanism is protected in the dismouting of exempting from to tool specifically is the needle mechanism is protected in the dismouting of exempting from to tool of any one of claims 1-9.

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