CN113713215A

CN113713215A - Internal rotation preventing mechanism suitable for self-administration device

Info

Publication number: CN113713215A
Application number: CN202111136545.1A
Authority: CN
Inventors: 熊长艳; 何四现; 杜嘉文; 易林川
Original assignee: Suzhou Jiashu Medical Technology Co ltd
Current assignee: Suzhou Jiashu Medical Technology Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2021-11-30

Abstract

The invention relates to an anti-internal rotation mechanism suitable for a self-administration device, which comprises a lower pen shell, wherein a PFS bracket is arranged in the lower pen shell, a PFS assembly is arranged in the PFS bracket, a pen cap is inserted and connected to the lower end of the lower pen shell, an expansion guide assembly is arranged at the lower end of the lower pen shell, an auxiliary limiting assembly extends upwards from the pen cap, a safety cap is sleeved on the PFS assembly, when the lower pen shell is combined with the pen cap, the expansion guide assembly is in contact with the outer side of the auxiliary limiting assembly, and the inner side of the expansion guide assembly is in contact with the safety cap. From this, rely on the cooperation of inflation guide assembly, supplementary spacing subassembly, can let PFS subassembly move ahead smoothly in the assembly, and unnecessary axial rotation can not appear in its appurtenant safety helmet, can not extrude and touch the needle point, can not appear falling of flexible glue particulate matter yet, ensure subsequent safe in utilizationly. The whole structure is simple, the existing self-administration device can be modified, the implementation cost is low, and the universality is better.

Description

Internal rotation preventing mechanism suitable for self-administration device

Technical Field

The invention relates to a limiting and guiding mechanism for a PFS assembly in a self-administration device, in particular to an anti-internal rotation mechanism suitable for the self-administration device.

Background

Currently, in order to facilitate users to realize independent and convenient self-administration therapy, self-administration systems or devices are popular. For the convenience of understanding, the automatic injector is mainly designed to have a disposable function in view of safety in use and in order to avoid secondary abuse.

The existing disposable automatic injector has very complex design principle, leads to a plurality of parts which are generally more than 15, so the reliability is not high, the assembly difficulty is large, and the final product cost is too high.

CN110237366A discloses a medical injection device, which comprises an outer barrel and a pen cap, one end of the outer barrel is provided with a detachable medicine bin, a replaceable standard card type medicine bottle is arranged in the medicine bin, one end of the inner part of the outer barrel close to the medicine bin is provided with a fixed sleeve, the inner axial movement of the fixed sleeve is provided with a push rod seat, the inner part of the push rod seat is provided with a transmission ring which can be meshed with the end part of a transmission rod, the outer side of the transmission rod is sleeved with a ratchet ring which can axially slide, one end face of the ratchet ring is in one-way meshing with the inner part of the outer barrel, the other end of the ratchet ring is axially provided with a first spring, one end of the push rod seat is axially provided with a push rod seat spring which is propped against the outer barrel, and one end of a push rod penetrates through the push rod seat to stretch into the standard card type medicine bottle to be connected with a push block.

CN109999272A discloses a disposable adjustable injection device for insulin injection, which comprises a protective cover, a disposable needle, a pen core sleeve, a main body shell, a pen core and an adjusting component, one end of the main body shell is provided with a second boss, the outside of the second boss is provided with a refill sleeve, one end of the pencil lead sleeve is provided with a thread groove, the external thread of the second boss is in threaded connection with the thread groove, the other end of the refill sleeve is provided with a first boss, the outside of the first boss is connected with a disposable needle head through threads, a steel needle is inserted in the disposable needle head, a pen core is arranged in the pen core sleeve, a protective cover is sleeved outside the pen core sleeve, the other end of main body cover is provided with adjusting part, main body cover's internally mounted has fixed sleeve, fixed sleeve's one end outside protrusion has flange portion.

CN102264417A discloses an injection device comprising: a long housing; a container carrier having a medicament container to which a needle is mounted; a puncture device comprising a separation sleeve, a preloaded puncture spring device and a puncture holding device, wherein said preloaded puncture spring device is capable of acting on said separation sleeve and thereby on said container carrier for a sliding movement of said container and needle, and said puncture holding device is capable of holding said puncture spring device in a loaded state; injection means comprising a plunger rod, pre-loaded injection spring means and injection retaining means, wherein the plunger rod is arranged to act on a stopper in the medicament container, the pre-loaded injection spring means is adapted to act on the plunger rod such that the stopper is displaced within the container, and the injection retaining means is adapted to retain the injection spring means in a loaded state; retraction means comprising a preloaded retraction spring and retraction holding means, wherein the preloaded retraction spring is arranged to act on the separation sleeve and thereby on the container carrier, and the retraction holding means is capable of holding the retraction spring in a loaded state; a puncture sequence initiating means capable of acting on a puncture trigger means arranged on said separation cannula for disconnecting said puncture holding means; an injection trigger means provided on said separation sleeve and capable of disconnecting said injection holding means to initiate an injection sequence when the separation sleeve and the plunger rod are moved to a specific position; and retraction triggering means arranged on said separation sleeve and capable of disconnecting said retraction holding means for initiating needle retraction when said plunger rod has been moved to a certain position; characterized in that the device further comprises damping means comprising a compartment containing a volume of a highly viscous liquid and being partly defined by the outer surface of the plunger rod and the inner surface of the cap, wherein the compartment is arranged with a channel through which the liquid is forced only upon initiation of the injection sequence, such that the volume within the compartment decreases with movement of the plunger rod in the container during the entire injection sequence and thereby damping shear forces are generated.

Meanwhile, the automatic injector disclosed in combination with 202011110579.9 comprises a body (1), a needle protecting cover (2), a push rod (3), a sound tube (4), an inner tube (5), a release ring (6), a driving elastic element and a reset elastic element;

a needle cylinder fixing structure for fixing the needle cylinder (9) is arranged in the shell (1), and an opening for the needle head (91) to extend out is formed in the front end of the shell (1);

the release ring (6) and the needle shield (2) are sequentially arranged on the inner side of the shell (1) in a sliding manner from the rear end to the front end, the needle shield (2) can extend out of the front end of the shell (1) and can slide towards the rear end relative to the shell (1) and push the release ring (6), and the reset elastic piece acts on the release ring (6) and drives the release ring (6) to push the needle shield (2) to slide towards the front end of the shell (1); the shell (1) is provided with a needle shield limiting structure for limiting the forward sliding distance of the needle shield (2) relative to the shell (1);

the push rod (3) is arranged in the shell (1) in an axially sliding mode, the front end of the push rod (3) is used for pushing a piston (93) in the needle cylinder (9), the driving elastic piece acts on the push rod (3) and drives the push rod (3) to slide towards the front end of the needle cylinder (9), and a push rod limiting structure is arranged on the periphery of the push rod (3);

the sounding cylinder (4) is sleeved on the periphery of the push rod (3) in an axially sliding manner, the driving elastic piece acts on the sounding cylinder (4) and drives the sounding cylinder (4) to slide towards the rear end of the shell (1), the sounding cylinder (4) is provided with a push rod limiting and matching structure, and a sounding cylinder limiting structure is arranged between the sounding cylinder (4) and the inner tube (5);

the inner pipe (5) is fixed in the shell (1) and sleeved on the periphery of the sounding cylinder (4), the release ring (6) is sleeved on the periphery of the inner pipe (5) in a sliding mode, the inner pipe (5) is provided with a first clamping clip (55) capable of elastically moving along the radial direction, and the first clamping clip (55) is deflected outwards along the radial direction under the action of self elasticity;

first clamping (55) can be in along radial inside skew and pass through under the limiting displacement of the inner wall of release ring (6) the spacing cooperation structure of push rod with the mutual joint of push rod limit structure is spacing, it can restrict under the supporting action of the outer wall of push rod (3) to sound a section of thick bamboo (4) with the relative slip of inner tube (5), push rod (3) can break away from behind the preset distance to the front end slip to sound a section of thick bamboo limit knot's support.

Conventional self-administration devices such as autoinjectors have employed separate PFS assemblies in view of drug replaceability. However, during installation of the PFS assembly, the helmet may be asked to rotate due to improper scratching with other assemblies. The safety cap can be caused to drop off the soft sealing glue during rotation, so that the soft sealing glue enters the needle point to cause injection accidents and have certain potential safety hazards. If the rotation is to be avoided, the assembly personnel is required to have higher experience, the assembly efficiency is reduced, and the possibility that the rotation cannot be prevented by adopting a manual assembly mode singly is also provided.

In view of the above-mentioned drawbacks, the present inventors have made active research and innovation to create an anti-rotation mechanism suitable for a self-administration device, which is more industrially valuable.

Disclosure of Invention

To solve the above technical problems, it is an object of the present invention to provide an anti-unscrewing mechanism suitable for a self-administration device.

The invention relates to an anti-internal rotation mechanism suitable for a self-administration device, which comprises a lower pen shell, wherein a PFS bracket is arranged in the lower pen shell, a PFS assembly is arranged in the PFS bracket, and a pen cap is inserted and connected at the lower end of the lower pen shell, wherein: the lower extreme of lower shell is provided with inflation guide assembly, the cap for brush extends upward and has supplementary spacing subassembly, the cover is equipped with the safety helmet on the PFS subassembly, and when lower shell and cap for brush combined together, inflation guide assembly contacted with supplementary spacing subassembly's the outside, inflation guide assembly's inboard contacts with the safety helmet.

Further, the anti-internal rotation mechanism for the self-administration device is characterized in that the expansion guide assembly is a plurality of support ribs distributed on the inner wall of the lower end of the lower pen shell.

Furthermore, the anti-internal rotation mechanism for the self-administration device is characterized in that the supporting rib comprises a bottom rib base, a contact protrusion extends outwards from the bottom rib base, and a contact surface is arranged outside the contact protrusion.

Further, the anti-internal rotation mechanism for a self-administration device is described, wherein the contact surface is a bevel surface with an angle of 5 to 10 degrees.

Furthermore, the aforesaid is applicable to the mechanism of preventing internal rotation of oneself device of dosing, wherein, supplementary spacing subassembly distributes for pairing has the centre gripping support bar, the inner wall of centre gripping support bar distributes has the snap ring, when the shell of writing a brush combines with the cap for writing a brush down, the snap ring is located the tail section of safety helmet.

Furthermore, the anti-internal rotation mechanism suitable for the self-administration device is characterized in that the top of the clamping support bar is provided with a contact arc surface.

Still further, the anti-pronation mechanism for a self-administration device as described above, wherein the cross-section of said snap ring is triangular; or the cross section of the snap ring is arc-shaped.

By the scheme, the invention at least has the following advantages:

1. rely on the cooperation of inflation guide assembly, supplementary spacing subassembly, can let PFS subassembly move ahead smoothly in the assembly, and unnecessary axial rotation can not appear in its appurtenant safety helmet, can not extrude and touch the needle point, can not appear falling of flexible glue particulate matter yet, ensure subsequent safe in utilizationly.

2. The whole structure is simple, the existing self-administration device can be modified, the implementation cost is low, and the universality is better.

3. The assembly process basically does not need to be adjusted, and the assembly line can adapt to the existing automatic installation line and manual installation line.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a structural schematic diagram of a lower pen shell.

Fig. 2 is a structural schematic diagram of the pen cap.

Figure 3 is a schematic view of the installation of a PFS assembly.

Fig. 4 is a schematic diagram of the position of the helmet.

The meanings of the reference symbols in the drawings are as follows.

1 lower pen shell 2PFS subassembly

3 pen cap 4 safety cap

5 support bar 6 clamping support bar

7-snap ring 8PFS bracket

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Fig. 1 to 4 show an anti-rotation mechanism for a self-administration device, which comprises a pen casing 1, a PFS bracket 8 is provided in the pen casing 1, a PFS assembly 2 is provided in the PFS bracket 8, and a pen cap 3 is inserted into the lower end of the pen casing 1, and the anti-rotation mechanism is characterized in that: the PFS subassembly 2 is gone up the cover and is equipped with safety helmet 4, and the lower extreme of lower shell of a pen 1 is provided with inflation guide assembly, and it has supplementary spacing subassembly to extend upward at cap of a pen 3 simultaneously. Thus, when the lower pen shell 1 is combined with the pen cap 3, the expansion guide assembly is contacted with the outer side of the auxiliary limiting assembly, and the inner side of the expansion guide assembly is contacted with the safety cap 4. Therefore, the safety helmet 4 can be limited in a proper transverse restraint mode during assembly of the PFS component 2, and smooth connection of the PFS component 2 into the PFS bracket 8 during assembly is not affected.

In a preferred embodiment of the present invention, in order to achieve smooth forward movement of the safety cap 4 without unnecessary axial twisting when receiving an improper external force, and to effectively share the pressure applied to the tail end of the PFS assembly 2 during assembly, the expansion guide assembly is a plurality of support ribs 5 distributed on the inner wall of the lower end of the lower pen casing 1, and the support ribs 5 may be distributed at equal intervals, and a contact space for the safety cap 4 to extend out is formed between the support ribs 5. Specifically, the support rib 5 comprises a bottom rib base, a contact protrusion extends outwards from the bottom rib base, and a contact surface is arranged on the outer side of the contact protrusion. Meanwhile, in order to better fit the appearance of the auxiliary limiting assembly and facilitate applying appropriate stress to the auxiliary limiting assembly by utilizing elastic shape, the adopted contact surface is an inclined surface with 5-10 degrees.

Further, in order to directly fit the external shape of the safety helmet 4, realize effective protective support, and prevent the safety helmet 4 from twisting when the PFS component 2 is assembled under the subsequent action of the support rib 5, the auxiliary limit components adopted by the invention are clamping support bars 6 distributed in pairs. Specifically, in order to facilitate the user to pull out the pen cap 3 and simultaneously to enable the safety cap 4 to be cooperatively separated, the invention also arranges the snap ring 7 on the inner wall of the clamping support bar 6, and when the lower pen shell 1 is combined with the pen cap 3, the snap ring 7 is positioned at the tail section of the safety cap 4.

In connection with practical implementation, the top of the clamping support bar 6 is provided with contact arcs in order to avoid unnecessary misalignment during assembly. Thus, even if the top end of the holding support bar 6 slightly deviates during installation, the holding support bar 6 is entirely positioned at a proper position due to the abdication of the contact arc surface.

Still further, in order to fit the tail end structure of the helmet 4, and not slip or expand outwards additionally to cause separation failure during cooperative separation, the cross section of the adopted snap ring 7 is triangular. Of course, snap rings 7 with circular arc cross-sections may be used, corresponding to some particular configurations.

The working principle of the invention is as follows:

during actual assembly, the pen cap 3 is pre-installed at the lower end of the lower pen shell 1, and the PFS assembly 2 is plugged into the PFS bracket 8 installed in the lower pen shell 1 from top to bottom. During this time, the helmet 4 to which the PFS assembly 2 belongs comes into contact with the clamping support bar 6, causing outward expansion stress. Simultaneously, centre gripping support bar 6 receives the spacing of brace rod 5, can feed back an inward effort, and this effort lets centre gripping support bar 6 laminate in safety helmet 4 outer end, and the axial rotation appears in the restriction it, and lets the FPS subassembly can only the atress move ahead. When the PFS assembly 2 is in place, the snap ring 7 holding the support bar 6 fits snugly into the trailing edge of the hard hat 4. In order to make the holding support strip 6 have better deformation effect and meet the guiding and limiting effects, the holding support strip 6 and the contact protrusions can have proper distance during the manufacturing process. Like this, can not lead to elastic deformation undersize because of the clearance is too big, can't realize safety helmet 4's spacing guide, also can not lead to safety helmet 4 excessive pressurized because of the clearance undersize yet, influence the assembly and go ahead.

The invention has the following advantages by the aid of the character expression and the accompanying drawings:

Furthermore, the indication of the orientation or the positional relationship described in the present invention is based on the orientation or the positional relationship shown in the drawings, and is only for convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or configuration must have a specific orientation or be operated in a specific orientation configuration, and thus, should not be construed as limiting the present invention.

The terms "primary" and "secondary" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Also, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "disposed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. And it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered as limiting.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a prevent internal rotation mechanism suitable for self-administration device, is including lower shell, be provided with the PFS bracket in the shell down, be provided with the PFS subassembly in the PFS bracket, the shell lower extreme connects with a cap, its characterized in that down: the lower extreme of lower shell is provided with inflation guide assembly, the cap for brush extends upward and has supplementary spacing subassembly, the cover is equipped with the safety helmet on the PFS subassembly, and when lower shell and cap for brush combined together, inflation guide assembly contacted with supplementary spacing subassembly's the outside, inflation guide assembly's inboard contacts with the safety helmet.

2. An anti-pronation mechanism suitable for use in a self-administration device according to claim 1, wherein: the expansion guide component is a plurality of support ribs distributed on the inner wall of the lower end of the lower pen shell.

3. An anti-pronation mechanism suitable for use in a self-administration device according to claim 2, wherein: the support rib comprises a bottom rib base, a contact protrusion extends outwards from the bottom rib base, and a contact surface is arranged on the outer side of the contact protrusion.

4. An anti-pronation mechanism suitable for use in a self-administration device according to claim 3, wherein: the contact surface is an inclined surface with 5 to 10 degrees.

5. An anti-pronation mechanism suitable for use in a self-administration device according to claim 1, wherein: the auxiliary limiting assembly is characterized in that clamping support bars are distributed in pairs, snap rings are distributed on the inner walls of the clamping support bars, and when the pen shell is combined with the pen cap, the snap rings are located at the tail section of the safety cap.

6. An anti-pronation mechanism suitable for use in a self-administration device according to claim 5, wherein: and the top of the clamping support bar is provided with a contact arc surface.

7. An anti-pronation mechanism suitable for use in a self-administration device according to claim 5, wherein: the cross section of the clamping ring is triangular; or the cross section of the snap ring is arc-shaped.