CN220676486U

CN220676486U - Disposable percussion structure

Info

Publication number: CN220676486U
Application number: CN202321643316.3U
Authority: CN
Inventors: 覃平; 韩龙; 濮雪年
Original assignee: Baojuhe Suzhou Medical Technology Co ltd
Current assignee: Baojuhe Suzhou Medical Technology Co ltd
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2024-03-29
Anticipated expiration: 2033-06-27

Abstract

The utility model discloses a disposable firing structure which comprises a push rod, a body, a sliding lantern ring, a spring mounting tube and a pen feeding shell, wherein the push rod compresses a second compression spring in the spring mounting tube, a groove is formed in the push rod, and a pawl matched with the groove is arranged on the body; the outer side of the body is sleeved with a sliding lantern ring; two ends of the second compression spring are respectively propped against the push rod and the spring mounting tube; an upper pen shell is arranged on the outer side of the sliding sleeve ring, and a first compression spring is arranged between the sliding sleeve ring and the upper pen shell. The utility model reduces the number of parts of the disposable firing mechanism, improves the reliability, reduces the assembly difficulty, reduces the parts and the production cost, and is more suitable for batch automatic production.

Description

Disposable percussion structure

Technical Field

The utility model relates to the technical field related to syringes, in particular to a disposable firing structure.

Background

The prefilled syringe is widely used for packaging high-yield products such as biological products, biochemical products, antithrombotic agents, cosmetic products and the like. With the rise of new domestic and consumer biologics of higher value, the need for prefilled syringes is expected to continue to increase. Prefilled syringes, because of their small size, portability, are capable of reliably providing accurate doses of medication, low risk of contamination, etc., which has led to a dramatic increase in their demand in the medical market.

The disposable firing structure in the existing prefilled syringe (such as a disposable needleless syringe with a publication number of CN102512733B, wherein the firing device comprises a central cylinder outer rubber shell, a central cylinder, a central shaft and a main force spring, and further comprises a main cylinder outer rubber shell, a main cylinder, a release button, a locking element, a cylindrical shaft sleeve, a shaft sleeve cover, a tension element, a shaft sleeve, a ball, a trigger spring and a release spring), the number of parts is large, the reliability is low, the assembly difficulty is high, the rapid mass automatic production is facilitated, and the final production cost is high.

Disclosure of Invention

The utility model aims to provide a disposable firing structure so as to solve the problems in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the disposable firing structure comprises a push rod, a body, a sliding lantern ring, a spring mounting tube and an upper pen shell, wherein the push rod compresses a second compression spring in the spring mounting tube, the body is positioned at the outer side of the spring mounting tube, a groove is formed in the push rod, and a pawl matched with the groove is arranged on the body; the outer side of the body is sleeved with a sliding lantern ring; two ends of the second compression spring are respectively propped against the push rod and the spring mounting tube; the pen is characterized in that an upper pen shell is arranged on the outer side of the sliding lantern ring, a first compression spring is arranged between the sliding lantern ring and the upper pen shell, and the body is connected with the upper pen shell through the sliding lantern ring.

Preferably, the pen further comprises a needle cylinder and a lower pen shell, the lower pen shell is fixedly connected with the upper pen shell, the needle cylinder is limited in the lower pen shell, the other end of the needle cylinder is abutted with the body, and the push rod can move in the needle cylinder.

Preferably, the spring mounting tube is provided with a spring pre-tightening stabilizer bar at one end of the second compression spring, and one end of the second compression spring is sleeved on the spring pre-tightening stabilizer bar.

Preferably, the spring mounting tube and the spring pre-tightening stabilizer are of an integrated structure.

Preferably, the groove is provided with an annular groove or an arc-shaped groove.

Preferably, the body is provided with a through hole, and the spring mounting tube is provided with a bulge matched with the through hole.

Compared with the prior art, the utility model has the beneficial effects that: the number of parts of the disposable firing mechanism is reduced, the reliability is improved, the assembly difficulty is reduced, and the parts and the production cost are reduced, so that the disposable firing mechanism is more suitable for batch automatic production.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the structure of the push rod of the present utility model;

FIG. 3 is a cross-sectional view of the body of the present utility model;

FIG. 4 is a schematic structural view of the body of the present utility model;

FIG. 5 is a schematic view of the structure of the spring mounting tube of the present utility model;

FIG. 6 is a schematic view of the structure of the push rod of the present utility model;

FIG. 7 is a schematic view of the present utility model prior to firing;

FIG. 8 is a schematic view of the present utility model in a configuration when firing is initiated;

FIG. 9 is a schematic view of the overall structure of the present utility model;

fig. 10 is a cross-sectional view of the entire present utility model.

In the figure: 101. a push rod; 102. a body; 103. a sliding collar; 104. a first compression spring; 105. a spring mounting tube; 106. a pen shell is arranged; 107. a spring pre-tightening stabilizer bar; 108. a second compression spring; 1011. a groove; 1021. a pawl; 1022. a through hole; 1051. a protrusion; 2. a pen shell is arranged; 3. a needle cylinder.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

Referring to fig. 1-10, in an embodiment of the present utility model, a disposable firing structure includes a push rod 101, a body 102, a sliding collar 103, a spring mounting tube 105 and a pen-loading shell 106, wherein the push rod 101 compresses a second compression spring 108 in the spring mounting tube 105, the body 102 is located outside the spring mounting tube 105, a groove 1011 is formed on the push rod 101, and a pawl 1021 matching with the groove 1011 is provided on the body 102; the outer side of the body 102 is sleeved with a sliding lantern ring 103; two ends of the second compression spring 108 respectively prop against the push rod 101 and the spring mounting tube 105; an upper pen shell 106 is arranged on the outer side of the sliding sleeve ring 103, a first compression spring 104 is arranged between the sliding sleeve ring 103 and the upper pen shell 106, and the body 102 is connected with the upper pen shell 106 through the sliding sleeve ring 103; a spring pre-tightening stabilizer bar 107 is arranged at one end of the spring mounting tube 105, which is positioned at the second compression spring 108, and one end of the second compression spring 108 is sleeved on the spring pre-tightening stabilizer bar 107; the spring mounting tube 105 and the spring pre-tightening stabilizer bar 107 are of an integrated structure; the groove 1011 is provided with an annular groove or an arc groove; the body 102 is provided with a through hole 1022, and the spring mounting tube 105 is provided with a protrusion 1051 matched with the through hole 1022.

The pen further comprises a needle cylinder 3 and a lower pen shell 2, the lower pen shell is fixedly connected with the upper pen shell, the needle cylinder is limited in the lower pen shell, the other end of the needle cylinder is abutted with the body, and the push rod 101 can move in the needle cylinder. After the lower pen case 2 is held by hand and contacts with the skin, pressure is applied to the trigger tube, the trigger tube passes through the gap between the body 102 and the upper pen case 106, the sliding collar 103 is pushed inwards, the pawl 1021 is separated from the groove 1011 under the elastic force of the second compression spring 108, and the push rod 101 pushes the piston in the syringe to inject liquid into the human body.

Fig. 1 state: for the push rod 101 to precompress the second spring 108 in the spring mounting tube 105, the push rod 101 is hooked by the pawl 1021 on the body 102 due to the groove 1011 of the push rod 101, the pawl 1021 on the body 102 cannot deform radially outwards due to being sleeved in the sliding sleeve 103, the sliding sleeve 103 can keep a trend of moving leftwards due to the thrust of the compressed first spring 104, so that the pawl 1021 on the body 102 cannot be exposed, the push rod 101 is firmly clamped by the pawl 1021 on the body 102, the other end of the second spring 108 is propped against the bottom of the spring mounting tube 105, the spring mounting tube 105 is hung on the through hole 1022 of the body 102 due to the protrusion 1051 on the other end, so that the axial direction of the pawl 1021 cannot move backwards, and the push rod 101 is precompressed in the spring mounting tube 105 by combining the above structures.

When the external force pushes the sliding collar 103 to move rightwards for a certain displacement (the pawl 1021 of the body 102 is completely exposed), the pretightening force of the second spring 108 enables the pawl 1021 to deform outwards, and when the deformation amount reaches a certain degree (the pawl 1021 cannot hook the groove 1011), the push rod 101 is released and is ejected under the action of the second spring 108, the piston in the needle tube is pushed to move, and the liquid medicine is discharged.

The spring pre-tension stabilizer 107 may be integrated with the spring mounting tube 105, i.e., as one piece, further reducing the number of parts.

The recess 1011 in the push rod 101 may be formed as a non-circular cut-out, as shown in fig. 6 at the recess 1011.

The shape of the firing mechanism assembly is circular in cross-section in the example, and may be rectangular instead to accommodate the appearance of a pen injector.

Fig. 7 and 8 show that the firing mechanism moves the sliding collar 103 rightward until the pawl 1021 is exposed before and at the start of firing, respectively, and the pawl 1021 is pushed open by the pushing force of the push rod 101, and then the push rod 101 pops out.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A disposable firing structure, characterized in that: the novel pen comprises a push rod (101), a body (102), a sliding sleeve ring (103), a spring mounting tube (105) and an upper pen shell (106), wherein the push rod (101) compresses a second compression spring (108) in the spring mounting tube (105), the body (102) is positioned at the outer side of the spring mounting tube (105), a groove (1011) is formed in the push rod (101), and a pawl (1021) matched with the groove (1011) is arranged on the body (102); a sliding lantern ring (103) is sleeved outside the body (102);

two ends of the second compression spring (108) respectively prop against the push rod (101) and the spring mounting pipe (105);

the pen is characterized in that an upper pen shell (106) is arranged on the outer side of the sliding sleeve ring (103), a first compression spring (104) is arranged between the sliding sleeve ring (103) and the upper pen shell (106), and the body (102) is connected with the upper pen shell (106) through the sliding sleeve ring (103).

2. The disposable firing structure of claim 1 wherein: the pen further comprises a needle cylinder (3) and a lower pen shell (2), the lower pen shell (2) is fixedly connected with an upper pen shell (106), the needle cylinder (3) is limited in the lower pen shell (2), the other end of the needle cylinder (3) is abutted to the body (102), and the push rod (101) can move in the needle cylinder.

3. The disposable firing structure of claim 1 wherein: the spring mounting pipe (105) is located at one end of the second compression spring (108) and is provided with a spring pre-tightening stabilizer bar (107), and one end of the second compression spring (108) is sleeved on the spring pre-tightening stabilizer bar (107).

4. The disposable firing structure of claim 3 wherein: the spring mounting tube (105) and the spring pre-tightening stabilizer (107) are of an integrated structure.

5. The disposable firing structure of claim 1 wherein: the groove (1011) is provided with an annular groove or an arc-shaped groove.

6. The disposable firing structure of claim 1 wherein: through holes (1022) are formed in the body (102), and bulges (1051) matched with the through holes (1022) are arranged on the spring mounting tube (105).