CN113559367A

CN113559367A - PFS limit structure suitable for self-administration device

Info

Publication number: CN113559367A
Application number: CN202111000272.8A
Authority: CN
Inventors: 熊长艳; 何四现; 杜嘉文; 易林川
Original assignee: Suzhou Jiashu Biomedical Technology Co ltd
Current assignee: Suzhou Jiashu Biomedical Technology Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2021-10-29

Abstract

The invention relates to a PFS limiting structure suitable for a self-administration device, which comprises a device shell, wherein a PFS shell is arranged in the device shell, a PFS component is arranged in the PFS shell, a plurality of limiting components are arranged in the lower end of the device shell, the outer edge of the lower end of the PFS shell is in contact with the limiting components, a plurality of extrusion components are arranged on the inner wall of the lower end of the PFS shell, the outer wall of the PFS component is in contact with the extrusion components, and a deformation notch is formed in the PFS shell. From this, through spacing subassembly, extrusion subassembly's existence, can realize that effectual "interlocking" combines between device shell, PFS shell, the PFS subassembly three, can not appear combining because of manufacturing tolerance and rock, possess better wholeness. The structure is simple, the conventional self-administration device can be modified, and the implementation cost is low. The stress transmission during the combination period can be effectively met, and abnormal deformation caused by local stress distribution can be avoided.

Description

PFS limit structure suitable for self-administration device

Technical Field

The invention relates to a limiting structure, in particular to a PFS limiting structure suitable for a 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. Meanwhile, in order to limit the FPS assembly, a PFS shell used for limiting and protecting correspondingly is often additionally arranged. However, due to manufacturing tolerances. After the PFS assembly is assembled to the PFS housing, a certain gap exists, which may cause the PFS assembly to shake therein, and when the PFS assembly is activated for use, a triggering deviation may be caused by the gap, which may affect the output of the drug from the PFS assembly. Meanwhile, a certain fit clearance exists between the PFS shell and the shell of the self-administration device due to manufacturing tolerance. Like this, after the assembly, it all has certain clearance to appear among device shell, PFS shell, the PFS subassembly three easily, appears that the PFS needle point rocks, pierces the skin, and patient's body feels comparatively poor, seriously influences the smooth and easy of injection in addition.

In view of the above-mentioned drawbacks, the present designer has made active research and innovation to create a PFS limiting structure suitable for a self-administration device, so that the PFS limiting structure has industrial application value.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a PFS limiting structure suitable for a self-administration device.

The invention relates to a PFS limiting structure suitable for a self-administration device, which comprises a device shell, wherein: the device is characterized in that a PFS shell is arranged in the device shell, a PFS component is arranged in the PFS shell, a plurality of limiting components are arranged inside the lower end of the device shell, the outer edge of the lower end of the PFS shell is in contact with the limiting components, a plurality of extruding components are arranged on the inner wall of the lower end of the PFS shell, the outer wall of the PFS component is in contact with the extruding components, and deformation notches are formed in the PFS shell.

Further, the above PFS limiting structure for a self-administration device, wherein a bearing edge is provided inside the lower end of the device housing, the lower side of the limiting component is connected to the bearing edge, and the outer side of the limiting component is simultaneously in contact with the inner wall of the device housing.

Furthermore, the above PFS limiting structure for a self-administration device is suitable for a self-administration device, wherein the limiting component is a limiting fixture block, and the limiting fixture blocks are distributed at equal intervals.

Furthermore, the above-mentioned PFS limiting structure for a self-administration device is suitable for a PFS limiting fixture, wherein the limiting fixture block is a rectangular block structure or a trapezoid block structure.

Furthermore, the above mentioned PFS limiting structure for a self-administration device, wherein the extrusion assembly is extrusion strips, and the extrusion strips are equidistantly distributed.

Still further, the above PFS stopper structure for a self-administration device, wherein the top end of the extrusion strip is provided with a guiding inclined surface.

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

1. through spacing subassembly, extrusion subassembly's existence, can realize that effectual "interlocking" combines between device shell, PFS shell, the PFS subassembly three, can not appear combining because of manufacturing tolerance and rock, possess better wholeness.

2. The structure is simple, the conventional self-administration device can be modified, and the implementation cost is low.

3. The stress transmission during the combination period can be effectively met, and abnormal deformation caused by local stress distribution can be avoided.

4. The injection and the frustration functions of the self-administration device during the use period can not be influenced.

5. The non-adhesive connection mode is adopted, so that the assembly is convenient to recover and adjust when abnormity occurs, and irreversible waste of each combination assembly cannot be caused.

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 schematic view of the structure of the device housing.

FIG. 2 is a schematic structural view of a PFS housing.

FIG. 3 is a schematic view of the combination of a PFS housing and a PFS assembly.

FIG. 4 is a top view of the combination of the device housing, PFS housing, and PFS assembly.

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

1 device housing 2PFS housing

3PFS subassembly 4 bears limit

5 limiting block 6 extruding strip

7 guide inclined plane 8 deformation notch

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.

A PFS restraining structure suitable for use in a self-administration device as shown in fig. 1 to 4 comprises a device housing 1, which is distinguished in that: a PFS shell 2 is arranged in the device shell 1, and a PFS component 3 is arranged in the PFS shell 2. Meanwhile, the lower end of the shell 1 of the device is internally provided with a plurality of limiting components, and the outer edge of the lower end of the PFS shell 2 is in contact with the limiting components. And, the lower extreme inner wall of PFS shell 2 is provided with a plurality of extrusion subassemblies, and the outer wall of PFS subassembly 3 contacts with the extrusion subassembly. Furthermore, the invention is provided with a deformation notch 8 on the PFS shell 2. Like this, when it received the effort that comes from spacing subassembly, extrusion subassembly, realize moderate elastic deformation, possess better interference fit effect. Thus, after assembly, the lower end of the PFS housing 2 is subjected to an inward expansion stress from the device housing 1 and an outward extrusion stress from the PFS assembly 3, and the three are properly displaced and limited to form a whole without shaking.

In a preferred embodiment of the present invention, a carrying edge 4 is disposed inside the lower end of the device housing 1, the lower side of the position-limiting component is connected to the carrying edge 4, and the outer side of the position-limiting component is simultaneously in contact with the inner wall of the device housing 1. Therefore, effective transmission of expansion stress can be realized, and the phenomenon that the device shell 1 is deformed improperly due to overlarge stress of one contact surface of a single limiting component is avoided.

Further, in order to facilitate the realization of sufficient contact with the lower end of the PFS assembly 3, the adopted limiting assemblies are limiting clamping blocks 5, and the limiting clamping blocks 5 are distributed at equal intervals. Meanwhile, in order to conform to the shape of the lower end of the PFS component 3, the contact can be more attached, and the adopted limiting clamping block 5 is in a rectangular block structure or a trapezoid block structure.

Still further, the extrusion components adopted by the invention are extrusion strips 6, and the extrusion strips 6 are distributed at equal intervals. Specifically, to facilitate guidance of the PFS assembly 3 during insertion, the top end of the extrusion strip 6 is provided with a guide ramp 7. Therefore, after the PFS component 3 and the PFS shell 2 are combined, the PFS component 3 can apply force on the extrusion strip 6, the PFS shell 2 is slightly expanded and deformed outwards under stress, and the deformation stress is applied to the limiting fixture block 5. In this way, a double interference fit interlock can be constructed.

Of course, the specific structures of the extruding component and the limiting component provided by the present invention are only for better explaining the structural relationship therebetween, but all the structures and limiting modes capable of achieving similar interference fit are within the protection scope of the present invention, and are not described herein again.

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, refer to an orientation or positional relationship illustrated in the drawings, which are used for convenience in describing the invention and to simplify 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 thus, are not to be construed as limiting the invention.

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 PFS limit structure suitable for self-administration device, including the device shell, its characterized in that: the device is characterized in that a PFS shell is arranged in the device shell, a PFS component is arranged in the PFS shell, a plurality of limiting components are arranged inside the lower end of the device shell, the outer edge of the lower end of the PFS shell is in contact with the limiting components, a plurality of extruding components are arranged on the inner wall of the lower end of the PFS shell, the outer wall of the PFS component is in contact with the extruding components, and deformation notches are formed in the PFS shell.

2. The PFS restraining structure of claim 1, wherein: the device is characterized in that a bearing edge is arranged inside the lower end of the device shell, the lower side of the limiting component is connected with the bearing edge, and the outer side of the limiting component is simultaneously contacted with the inner wall of the device shell.

3. The PFS restraining structure of claim 1, wherein: the limiting assemblies are limiting clamping blocks, and the limiting clamping blocks are distributed at equal intervals.

4. A PFS restraining structure adapted for use in a self-administration device according to claim 3, wherein: the limiting clamping block is in a rectangular block structure or a trapezoidal block structure.

5. The PFS restraining structure of claim 1, wherein: the extrusion assembly is an extrusion strip, and the extrusion strips are distributed at equal intervals.

6. A PFS limiting structure adapted for use in a self-administration device according to claim 5, wherein: the top end of the extrusion strip is provided with a guide inclined plane.