CN213911794U

CN213911794U - Rubber plug piston assembly, needle cylinder and injector

Info

Publication number: CN213911794U
Application number: CN202022510188.8U
Authority: CN
Inventors: 王五星; 王德忍
Original assignee: Shenzhen Antmed Co ltd
Current assignee: Shenzhen Antmed Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-08-10
Anticipated expiration: 2030-11-03

Abstract

The utility model discloses a plug piston assembly, cylinder and syringe, wherein, plug piston assembly is applied to the syringe, and the syringe is equipped with the cylinder, and the cylinder has the opening, and plug piston assembly includes plug and piston. In the cylinder was located in the plug slides to sealed opening, the plug was formed with the holding tank, was equipped with spacing card protruding in the holding tank, and spacing card is protruding including spacing portion and first joint portion, and first joint portion is connected with spacing portion, and the piston is inserted and is located in the holding tank, and the lateral surface of piston is equipped with the first joint recess of spacing draw-in groove and spacing draw-in groove intercommunication, and spacing portion inserts and locates in the spacing draw-in groove, and first joint portion inserts and locates in the first joint recess. The plug piston assembly that this application adopted not only can connect and sealed cylinder, can also be through setting up spacing portion and first joint portion to set up rather than corresponding spacing draw-in groove and the first joint recess that matches, can strengthen the joint strength of plug and piston, avoid plug and piston to take place to drop.

Description

Rubber plug piston assembly, needle cylinder and injector

Technical Field

The utility model relates to the technical field of medical equipment, in particular to plug subassembly, cylinder and syringe.

Background

In order to ensure the connection between the syringe and the push rod, two methods are commonly used for connecting the syringe and the push rod. One is that on the basis of setting up the piston in the end of the push rod, set up the rubber ring on the external surface of the piston, seal the opening of the syringe through the rubber ring; the other is that a rubber plug is sleeved outside the piston on the basis that the end part of the push rod is provided with the piston. The rubber ring, the rubber plug and the piston are usually elastically deformed by the rubber plug or the rubber ring, so that the rubber ring or the rubber plug is sleeved on the piston. However, when the push rod pushes the rubber plug and the piston to slide in the cylinder body of the needle cylinder, the existing matching connection structure easily causes the rubber ring or the rubber plug to fall off from the piston due to deformation, so that the opening of the cylinder body cannot be sealed, and the liquid medicine in the needle cylinder leaks.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a plug piston assembly aims at providing a sealed effectual, the plug piston assembly that structural strength is high.

In order to achieve the above object, the utility model provides a plug piston assembly is applied to the syringe, the syringe is equipped with the cylinder, the cylinder has the opening, plug piston assembly includes:

the rubber plug is arranged in the needle cylinder in a sliding mode and seals the opening, an accommodating groove is formed in the rubber plug, a limiting clamping protrusion is arranged in the accommodating groove and comprises a limiting portion and a first clamping portion, and the first clamping portion is connected with the limiting portion; and

the piston is inserted into the containing groove, a limiting clamping groove and a first clamping groove communicated with the limiting clamping groove are formed in the outer side face of the piston, the limiting portion is inserted into the limiting clamping groove, and the first clamping portion is inserted into the first clamping groove.

In one embodiment of the present application, the rubber plug comprises:

the rubber plug main body is at least partially formed in the accommodating groove, the limiting part is connected with the inner side surface of the rubber plug main body, and the first clamping part is connected to one end, away from the rubber plug main body, of the limiting part; and

the rubber plug head is connected to the rubber plug main body, and the groove bottom wall of the accommodating groove is formed in the rubber plug head.

In an embodiment of the application, the first clamping portion is disposed on a side surface of the limiting portion facing the rubber plug head.

In an example embodiment of this application, spacing protruding still includes second joint portion, second joint portion is located spacing portion deviates from the side of plug main part, the lateral surface of piston is equipped with second joint recess, second joint portion is inserted and is located in the second joint recess.

In an example embodiment of the present application, the limiting portion is provided with a third clamping groove, the third clamping groove is provided in a side surface of the limiting portion deviating from the rubber plug main body, the outer side surface of the piston is provided with a third clamping portion, and the third clamping portion is inserted into the third clamping groove.

In an example embodiment of this application, the plug main part is the column, spacing card protruding ring setting.

In an example embodiment of the present application, the stopper portion has a guiding inclined surface formed from an opening end of the receiving groove toward a groove bottom wall.

In an embodiment of the present application, the outer side surface of the rubber plug is formed with an annular groove.

This application still provides a cylinder, the cylinder includes a section of thick bamboo body and plug piston assembly, a section of thick bamboo body is equipped with the opening, plug piston assembly includes:

The application still provides an injector, including push rod and cylinder, the cylinder includes a section of thick bamboo body and plug piston assembly, a section of thick bamboo body is equipped with the opening, plug piston assembly includes:

The technical proposal of the utility model is that the piston is inserted into the holding tank formed by the rubber plug, so that the piston is connected with the rubber plug. The piston can also be connected with the needle cylinder in a sliding way by arranging the rubber plug in the needle cylinder in a sliding way, and the rubber plug can slide in the needle cylinder along with the piston by pushing the piston, so that the needle cylinder can repeatedly feed liquid, transfuse and exhaust. The rubber plug can seal the opening of the needle cylinder, so that the liquid medicine in the needle cylinder is prevented from flowing out from one end of the opening to cause liquid medicine leakage.

In addition, through the spacing card protruding that includes first joint portion and spacing portion in the plug setting to set up at the piston and fix spacing draw-in groove and first joint recess with spacing portion and first joint portion joint respectively, can increase the area of contact of plug and piston, strengthen the joint strength of plug and piston, make both connect more firmly, avoid plug and piston to take place to drop.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of the rubber plug piston assembly of the present invention;

fig. 2 is a schematic cross-sectional view of an embodiment of the rubber plug piston assembly of the present invention;

fig. 3 is a schematic sectional view of the rubber plug piston assembly disassembly structure of the present invention.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 3, the present invention provides a plug piston assembly 100, wherein the plug piston assembly 100 is applied to an injector, the injector is provided with a needle cylinder, and the needle cylinder has an opening.

In an embodiment of the present invention, the plug piston assembly 100 includes a plug 10 and a piston 30. The plug 10 slides and locates in the cylinder, and sealed opening, the plug 10 is formed with holding tank 10a, be equipped with spacing protruding 11 of card in the holding tank 10a, spacing protruding 11 of card includes spacing portion 111 and first joint portion 113, first joint portion 113 is connected with spacing portion 111, piston 30 inserts and locates in the holding tank 10a, piston 30's lateral surface is equipped with spacing draw-in groove 30a and the first joint recess 30b that communicates with spacing draw-in groove 30a, spacing portion 111 is inserted and is located in spacing draw-in groove 30a, first joint portion 113 is inserted and is located in first joint recess 30 b.

The rubber plug 10 may be made of polyvinyl chloride, rubber, or silica gel, the piston 30 may be made of Acrylonitrile-Butadiene-Styrene copolymer (ABS) or Polycarbonate (PC), or may be made of other engineering plastics, and the specific materials of the rubber plug 10 and the piston 30 are not limited in this application.

The utility model discloses technical scheme makes piston 30 be connected with plug 10 through inserting piston 30 in locating the holding tank 10a that plug 10 formed. The piston 30 can be connected with the syringe in a sliding way by sliding the rubber plug 10 in the syringe, and the rubber plug 10 can slide in the syringe along with the piston 30 by pushing the piston 30, so that the syringe can repeatedly feed liquid, transfuse liquid and exhaust. The rubber plug 10 can seal the opening of the syringe, and prevent the liquid medicine in the syringe from flowing out from one end of the opening to cause liquid medicine leakage.

In addition, through the protruding 11 of spacing card including first joint portion 113 and spacing portion 111 of setting at plug 10 to set up respectively with spacing portion 111 and the fixed spacing draw-in groove 30a of the 113 joint of first joint portion and first joint recess 30b at piston 30, can increase the area of contact of plug 10 and piston 30, strengthen plug 10 and piston 30's joint strength, make both connect more firmly, avoid plug 10 and piston 30 to take place to drop.

Referring to fig. 2, in an embodiment of the present application, the rubber plug 10 includes a rubber plug main body 13 and a rubber plug head 15, at least a portion of the receiving groove 10a is formed in the rubber plug main body 13, the limiting portion 111 is connected to an inner side surface of the rubber plug main body 13, the first clamping portion 113 is connected to an end of the limiting portion 111 departing from the rubber plug main body 13, the rubber plug head 15 is connected to the rubber plug main body 13, and a groove bottom wall of the receiving groove 10a is formed on the rubber plug head 15.

The rubber plug main body 13 can be cylindrical, square column or any other shape, and can be specifically arranged according to the shapes of the rubber plug 10 and the needle cylinder. Because the plug 10 slides in the cylinder when, can receive frictional force and take place deformation with the plug main part 13 of cylinder butt, connect first joint portion 113 in the one end that spacing portion 111 deviates from plug main part 13, the deformation influence that can make first joint portion 113 receive is less, thereby avoid first spacing portion 111 to directly follow the internal slip-out of first joint recess 30b, and then further strengthen the joint strength between plug 10 and the piston 30, avoid plug 10 and piston 30 to drop, improve and use the impression.

Referring further to fig. 2, in an embodiment of the present application, the first clamping portion 113 is disposed on a side surface of the limiting portion 111 facing the plug head 15. So set up, not only can be when pegging graft spacing portion 111 in spacing draw-in groove 30a, it is fixed with stopper 10 and piston 30 spacing on vertical direction, can also be through pegging graft first joint portion 113 in first joint recess 30b, it is fixed with stopper 10 and piston 30 on the horizontal direction, thereby from spacing fixed stopper 10 of multidirectional and piston 30, with the intensity of further strengthening stopper 10 and piston 30 connection structure, prevent that stopper 10 and piston 30 from droing.

Referring to fig. 3, in an embodiment of the present application, the limiting protrusion 11 further includes a second clamping portion 115, the second clamping portion 115 is disposed on a side surface of the limiting portion 111 departing from the rubber plug main body 13, a second clamping groove 30c is disposed on an outer side surface of the piston 30, and the second clamping portion 115 is inserted into the second clamping groove 30 c.

The second clamping portion 115 is inserted into the second clamping groove 30c, so that the contact area between the rubber plug 10 and the piston 30 can be increased, and the resistance to relative movement between the rubber plug 10 and the piston 30 caused by deformation of the rubber plug 10 can be increased when the rubber plug 10 slides in the needle cylinder, so that the possibility of falling off of the rubber plug 10 and the piston 30 is reduced.

It can be understood that spacing portion 111 is equipped with the third joint recess, and the side that spacing portion 111 deviates from plug main part 13 is located to the third joint recess, and the lateral surface of piston 30 is equipped with third joint portion, and third joint portion inserts and locates in the third joint recess, can realize increasing the effect of the resistance when plug 10 and piston 30 relative motion equally, and it is no longer repeated in detail here.

In an embodiment of the present application, the rubber plug body 13 is cylindrical, and the limiting protrusion 11 is disposed annularly. Set up spacing protruding 11 annular of card in plug main part 13, can increase the area of plug 10 and piston 30's joint structure to strengthen plug 10 and piston 30's joint strength, can further avoid because plug 10 takes place deformation when sliding in the cylinder, and drop with piston 30, avoid plug 10 to lead to the unable sealing of opening of cylinder when deformation, take place the weeping phenomenon.

Referring to fig. 2, in an embodiment of the present application, the stopper portion 111 is formed with a guide slope 111a from the opening end of the receiving groove 10a toward the groove bottom wall. The guiding inclined plane 111a can guide the piston 30 inserted into the rubber plug 10, so that the connection between the piston and the rubber plug is more labor-saving, and the piston 30 can be conveniently inserted into the rubber plug 10.

In an example embodiment of the present application, the outer side surface of the rubber plug 10 may also be formed with an annular groove 10 b. The annular groove 10b can provide a space for accommodating the deformation of the rubber plug 10 when the rubber plug 10 slides in the needle cylinder and deforms, thereby avoiding the blockage of the rubber plug 10 when the rubber plug 10 slides in the needle cylinder. The annular groove 10b can also avoid the phenomenon that the rubber plug 10 is too large in deformation, so that the opening of the needle cylinder cannot be sealed, and liquid leakage occurs.

The utility model discloses still provide a cylinder (not shown), this syringe includes a section of thick bamboo body and plug piston assembly 100, and the concrete structure of plug piston assembly 100 refers to above-mentioned embodiment, because this cylinder has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer repeated here one by one.

The utility model discloses still provide an injector (not shown), this injector includes push rod and cylinder, and the concrete structure of cylinder refers to above-mentioned embodiment, because this injector has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here. Wherein the push rod is inserted into the piston 30.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a plug piston assembly, is applied to the syringe, the syringe is equipped with the cylinder, the cylinder has the opening, its characterized in that, plug piston assembly includes:

2. The plug piston assembly of claim 1 wherein the plug comprises:

3. The rubber plug piston assembly of claim 2, wherein the first engaging portion is disposed on a side of the limiting portion facing the rubber plug head.

4. The rubber plug piston assembly according to claim 2, wherein the limiting protrusion further comprises a second clamping portion, the second clamping portion is disposed on a side surface of the limiting portion away from the rubber plug body, a second clamping groove is disposed on an outer side surface of the piston, and the second clamping portion is inserted into the second clamping groove.

5. The rubber plug piston assembly according to claim 2, wherein the limiting portion is provided with a third clamping groove, the third clamping groove is provided on a side surface of the limiting portion facing away from the rubber plug body, the outer side surface of the piston is provided with a third clamping portion, and the third clamping portion is inserted into the third clamping groove.

6. The rubber plug piston assembly according to any one of claims 2 to 5, wherein the rubber plug body is cylindrical, and the limiting clamp projection is annularly arranged.

7. The plug piston assembly according to any of the claims 1 to 5 wherein the stopper has a guiding slope from the open end of the receiving groove to the bottom wall of the groove.

8. The rubber plug piston assembly according to any one of the claims 1 to 5, wherein the outer side surface of the rubber plug is formed with an annular groove.

9. A syringe comprising a barrel body and a plug piston assembly according to any one of claims 1 to 8, wherein the opening is provided in the barrel body, and the plug is slidably disposed in the barrel body and seals the opening.

10. A syringe comprising a plug piston assembly according to any one of claims 1 to 8;

alternatively, comprising a plunger and the syringe of claim 9, said plunger being insertedly connected to said piston.