CN211096711U

CN211096711U - Syringe with a needle

Info

Publication number: CN211096711U
Application number: CN201921449043.2U
Authority: CN
Inventors: 王五星; 于敬军
Original assignee: Shenzhen Antmed Co ltd
Current assignee: Shenzhen Antmed Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-07-28
Anticipated expiration: 2029-08-30

Abstract

The utility model discloses an injector, which comprises a needle cylinder, a piston and a sealing plug; the piston is arranged in the needle cylinder in a sliding way; the sealing plug is fixedly arranged on the piston and at least partially clamped between the piston and the needle cylinder, at least three sealing rings are convexly arranged on the outer wall of the sealing plug, the sealing rings abut against the inner wall of the cylinder body, and a fillet is formed on one side of the sealing rings abutting against the needle cylinder. The technical scheme of the utility model is through protruding at least three sealing washer of establishing at the outer wall of sealing plug, and the sealing washer supports the inner wall of holding the cylinder, then has strengthened the sealed effect between piston and the cylinder. In addition, a chamfer is formed on one side of the sealing ring abutting against the cylinder, so that the situation of jamming between the sealing ring and the cylinder when the piston inclines can be avoided in the injection process, and the resistance between the sealing ring and the inner wall of the cylinder can be reduced due to the arrangement of the chamfer.

Description

Syringe with a needle

Technical Field

The utility model relates to the technical field of medical treatment, in particular to syringe.

Background

At present, a high-pressure radiography injector comprises a syringe, a piston is arranged in the syringe, a rubber plug is arranged at the tail end of the piston, and the syringe is sealed through the rubber plug. However, the rubber plug is easy to fall off at the tail end, and the sealing effect is poor.

The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing an injector, aiming at improving the problem of poor sealing performance between the inner piston and the needle cylinder of the injector.

In order to achieve the purpose, the utility model provides an injector, which comprises a needle cylinder, a piston and a sealing plug; the piston is arranged in the needle cylinder in a sliding manner; the sealing plug is fixedly arranged on the piston, at least part of the sealing plug is clamped between the piston and the inner wall of the needle cylinder, at least three sealing rings are convexly arranged on the outer wall of the sealing plug, the sealing rings abut against the inner wall of the cylinder body, and a fillet is formed on one side of the sealing rings abutting against the needle cylinder.

Optionally, the piston comprises a cylindrical section and a conical section connected with the cylindrical section, wherein the conical section is connected with one end of the cylindrical section; the sealing plug includes first cover portion of establishing and connects the first second cover portion of establishing, first cover portion of establishing overlaps to be located outside the toper section, the second cover portion of establishing overlap is located outside the cylinder section, the second cover portion of establishing presss from both sides and locates the piston with between the inner wall of cylinder, the sealing washer is protruding to be located the second cover portion of establishing.

Optionally, the cylindrical section comprises a first cylindrical section and a second cylindrical section; the first cylindrical section is connected with the conical section, the second cylindrical section is connected with one end, away from the conical section, of the first cylindrical section, and the outer diameter size of the first cylindrical section is smaller than that of the second cylindrical section; the second sleeving part is sleeved outside the first cylindrical section.

Optionally, the outer wall of the first cylindrical section is provided with a groove, the inner wall of the second sleeving part is provided with a convex block in a protruding manner, and the convex block is clamped in the groove.

Optionally, an insertion groove is formed at an end of the second cylindrical section away from the first cylindrical section, and is used for inserting a push rod.

Optionally, at least two buckling parts are convexly arranged on the end surface of the second cylindrical section, which is away from the first cylindrical section, and the at least two buckling parts are symmetrically arranged around the center of the end surface.

Optionally, the thickness of the sealing ring is gradually reduced from the axis of the syringe to the inner wall of the syringe.

Optionally, the raised height of the sealing ring is gradually reduced in the direction of injection advancement.

Optionally, the distance between every two adjacent sealing rings is gradually reduced in the injection advancing direction.

Optionally, the sealing ring is made of rubber or silica gel; the piston is made of acrylonitrile-butadiene-styrene copolymer or polycarbonate.

The technical scheme of the utility model is through protruding at least three sealing washer of establishing at the outer wall of sealing plug, and the sealing washer supports the inner wall of holding the cylinder, then has strengthened the sealed effect between piston and the cylinder. In addition, a chamfer is formed on one side of the sealing ring abutting against the cylinder, so that the situation of jamming between the sealing ring and the cylinder when the piston inclines can be avoided in the injection process, and the resistance between the sealing ring and the inner wall of the cylinder can be reduced due to the arrangement of the chamfer.

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 diagram of an exploded structure of an embodiment of the injector of the present invention;

fig. 2 is a front view of an embodiment of the syringe of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

fig. 5 is a front view of a sealing plug in another embodiment of the syringe of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Needle cylinder	110	Barrel body
120	Needle head connecting pipe	121	External thread
				122	Positioning boss	200	Piston
210	Cylindrical section	211	A first cylindrical section
				2111	Groove	212	Second cylindrical section
2121	Plug-in groove	2122	Fastening part
				220	Conical section	300	Sealing plug
310	First set of department	320	Second sheathing part
				321	Bump	322	Sealing ring
3221	Fillet

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, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications 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 indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. 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.

The utility model provides an injector.

In the embodiment of the present invention, please refer to fig. 2 to 4 in combination, the injector includes a syringe 100, a piston 200 and a sealing plug 300; the piston 200 is arranged in the syringe 100 in a sliding way; the sealing plug 300 is fixedly arranged on the piston 200, and at least partially clamped between the piston 200 and the inner wall of the syringe 100, at least three sealing rings 322 are convexly arranged on the outer wall of the sealing plug 300, the sealing rings 322 are abutted against the inner wall of the syringe 100, and a rounded angle 3221 is formed at one side of the sealing rings 322 abutted against the syringe 100.

The piston 200 is slidably disposed in the syringe 100, and during the injection process, the piston 200 is pushed by an external force to slide in the injector, so as to drive the liquid in the syringe 100 into the body through the needle connected to the syringe 100. The sealing plug 300 is adapted to the piston 200 and sleeved outside the piston 200, and at least three sealing rings 322 are convexly disposed on the outer wall of the sealing plug 300, and the sealing rings 322 support against the inner wall of the syringe 100, so that it can be understood that the sealing rings 322 are in interference fit with the syringe 100, thereby improving the sealing effect between the piston 200 and the syringe 100. In addition, the rounded angle 3221 is formed at a side of the sealing ring 322 abutting against the syringe 100, so that a phenomenon of locking between the piston 200 and the inner wall of the syringe 100 when the sealing plug 300 and the piston 200 are inclined can be avoided, and the sliding of the piston 200 can be guided, and the resistance between the sealing ring and the inner wall of the syringe can be reduced due to the rounded angle 3221.

Specifically, the sealing rings 322 may have three, four, or more. The spacing between each two adjacent sealing rings 322 may be the same or different. In order to have a better sealing effect, the material of the sealing ring 322 is softer than that of the piston 200. For example, the sealing ring 322 may be made of rubber or silica gel, where the rubber and silica gel are conventional materials, and the sealing ring 322 may also be made of other elastomers; the piston 200 may be made of Acrylonitrile Butadiene Styrene (ABS) or Polycarbonate (PC), where ABS and PC are also known materials, although the piston 200 may be made of other engineering plastics.

The utility model discloses technical scheme is through protruding at least three sealing washer 322 of establishing at the outer wall of sealing plug 300, and sealing washer 322 supports the inner wall of holding cylinder 100, then has strengthened the sealed effect between piston 200 and cylinder 100. In addition, a chamfer is formed on one side of the sealing ring 322 abutting against the cylinder 110, so that the situation that the sealing ring 322 is stuck with the syringe 100 when the piston 200 inclines in the injection process can be avoided, and the resistance between the sealing ring 322 and the inner wall of the syringe 100 can be reduced due to the arrangement of the chamfer 3221.

Further, in the present embodiment, the thickness of the sealing ring 322 is gradually reduced from the axis of the syringe 100 to the inner wall of the syringe 100.

Through the arrangement, the area of one side of the sealing ring 322, which is abutted against the needle cylinder 100, is smaller, so that on one hand, the contact between the sealing ring 322 and the needle cylinder 100 is closer to line-surface contact, and the sealing effect of the sealing ring 322 is improved; on the other hand, the frictional resistance between itself and the cylinder 100 during the injection process can be reduced, thereby facilitating the injection work. Specifically, the cross-sectional shape of the sealing ring 322 may be trapezoidal or triangular.

Of course, in other embodiments, the shape of the sealing ring 322 may also be rectangular or other shapes, and the present invention is not limited to the above shapes.

In this embodiment, the raised height of the sealing ring 322 is gradually reduced in the direction of injection advance, as shown in fig. 5.

It should be noted that the direction of injection advancement is the direction of advancement in which the liquid is advanced into the patient when the physician uses the syringe. The protrusion height is the height at which the sealing ring 322 protrudes from the outer wall of the bore seal 300. In addition, in the direction of injection advance, the sealing ring 322 includes a first sealing ring, a second sealing ring and a third sealing ring in sequence, and then the height H1 of the protrusion of the first sealing ring is greater than the height H2 of the protrusion of the second sealing ring, and the height H2 of the protrusion of the second sealing ring is greater than the height H3 of the protrusion of the third sealing ring. By such arrangement, on the premise of ensuring that the sealing ring 322 can seal, the resistance between the sealing ring 322 and the inner wall of the syringe 100 in the injection process can be reduced.

Of course, in other embodiments, the height of each sealing ring 322 may be the same, which facilitates manufacturing.

In the present embodiment, as shown in fig. 5, the distance between each two adjacent sealing rings 322 is gradually decreased in the injection advancing direction.

During injection, the seal 322 closest to the needle is first subjected to the resistance of the fluid, and the seal 322 closest to the needle may deform, thereby causing a portion of the fluid to flow into the cavity formed between the seal 322 closest to the needle and its adjacent seal 322. By gradually decreasing the distance between each adjacent two sealing rings 322 in the direction of injection advance, the cavity formed between the sealing ring 322 closest to the needle and the adjacent sealing ring 322 is made smaller, thereby reducing the liquid flow into the cavity and ensuring that most of the liquid is injected into the patient.

For example, in the direction of injection advance, the sealing rings 322 include a first sealing ring, a second sealing ring, and a third sealing ring in that order, and the distance L1 between the third sealing ring and the second sealing ring is smaller than the distance L2 between the second sealing ring and the first sealing ring.

Of course, in other embodiments, the distance between every two adjacent sealing rings 322 may be the same, which facilitates manufacturing.

Further, referring to fig. 1 to 3, the piston 200 includes a cylindrical section 210 and a conical section 220 connected to the cylindrical section 210, wherein the conical section 220 is connected to one end of the cylindrical section 210; the sealing plug 300 includes a first nesting portion 310 and a second nesting portion 320 connected to the first nesting portion 310, the first nesting portion 310 is sleeved outside the tapered section 220, the second nesting portion 320 is sleeved outside the cylindrical section 210, and the sealing ring 322 is protruded on the second nesting portion 320.

By sleeving the first sleeving part 310 outside the tapered section 220 and the second sleeving part 320 outside the cylindrical section 210, the connection area between the sealing plug 300 and the piston 200 can be increased, thereby improving the stability of the installation of the sealing plug 300. The sealing ring 322 is protruded from the second nesting portion 320, that is, the sealing ring 322 is disposed corresponding to the cylindrical section 210 of the piston 200, so that the sealing effect between the piston 200 and the syringe 100 can be better improved.

Specifically, the first sleeve portion 310 may also be tapered to fit with the tapered section 220. The second nesting portion 320 may be cylindrical to fit the cylindrical section 210.

Further, as shown in fig. 1 and 3, the cylindrical section 210 includes a first cylindrical section 211 and a second cylindrical section 212; the tapered section 220 is connected to one end of the first cylindrical section 211, the second cylindrical section 212 is connected to one end of the first cylindrical section 211, which is far away from the tapered section 220, and the outer diameter of the first cylindrical section 211 is smaller than that of the second cylindrical section 212; the second nesting portion 320 is sleeved outside the first cylindrical section 211.

The outer diameter size that is greater than first cylinder section 211 through the outer diameter size with second cylinder section 212 sets up, and outside the first cylinder was located to second cover portion 320, then second cylinder section 212 had spacing effect to sealing plug 300 towards the terminal surface of first cylinder section 211 to be favorable to promoting efficiency and the stability of sealing plug 300 installation.

Further, referring to fig. 1 and fig. 3, a groove 2111 is formed on an outer wall of the first cylindrical section 211, a protrusion 321 is convexly formed on an inner wall of the second nesting portion 320, and the protrusion 321 is clamped into the groove 2111.

By snapping the projection 321 into the recess 2111, a more secure mounting of the plug 300 is further ensured. Of course, in other embodiments, the outer wall of the first cylindrical section 211 may also be provided with a positioning column in a protruding manner, and the inner wall of the second sleeve portion 320 is provided with a positioning groove into which the positioning column is inserted, so as to ensure that the sealing plug 300 is installed more stably.

Further, as shown in fig. 1, an end of the second cylindrical section 212 facing away from the first cylindrical section 211 is formed with an insertion groove 2121 for inserting the push rod.

It can be understood that a part of the push rod can be inserted into the insertion groove 2121, so that the pre-positioning effect of the push rod and the piston 200 can be realized by inserting the part of the push rod into the insertion groove 2121 before the push rod is connected with the piston 200, thereby further facilitating the subsequent connection of the push rod and the piston 200. Specifically, the insertion groove 2121 may extend along a length direction of the cylindrical section 210 and may be located at a center of the cylindrical section 210.

Further, as shown in fig. 1 or fig. 2, two locking portions 2122 are convexly disposed on an end surface of the second cylindrical section 212 facing away from the first cylindrical section 211, and the two locking portions 2122 are symmetrically disposed about a center of the end surface.

Through the above arrangement, it is convenient for the push rod to be connected with the piston 200, and specifically, the push rod may have a fitting portion snap-connected with the snap portion 2122, so that after the fitting portion is snap-connected with the snap portion 2122, the doctor can push the piston 200 to slide in the syringe 100 by means of the push rod, thereby completing the injection process.

In other embodiments, there may be 3, 4 or more snapping parts 212, and the snapping parts 212 may be uniformly distributed in a ring shape, and the center of the ring shape may coincide with the center of the end surface of the cylindrical section 210 facing away from the tapered section 220.

Further, as shown in fig. 1 or fig. 2, the syringe 100 includes a barrel 110 and a needle connecting tube 120 connected to one end of the barrel 110, the needle connecting tube 120 is communicated with the barrel 110, and the piston 200 is disposed in the barrel 110; the outer wall of the needle coupling tube 120 is formed with external threads 121.

The needle connecting tube 120 is used for connecting a needle, and is communicated with the cylinder 110 through the needle connecting tube 120, so that the liquid in the cylinder 110 is pushed by the piston 200 and flows to the needle through the needle connecting tube 120, and then the injection effect on the patient is realized. The outer wall of the needle coupling tube 120 is formed with external threads 121 to facilitate the threaded connection of the syringe with other coupling tubes.

In another embodiment, the outer wall of the needle connecting tube 120 may be further protruded with a positioning protrusion 122. Needle attachment tube 120 may be connected to other components through positioning protrusion 122, for example, the component may be a stopper of barrel 100, which may have a positioning groove matching with the positioning protrusion, and the positioning protrusion is snapped into the positioning groove, thereby enhancing the connection stability of the stopper of barrel 100 and needle attachment tube 120.

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

Claims

1. A syringe, comprising:

a needle cylinder;

the piston is arranged in the needle cylinder in a sliding manner; and

the sealing plug is fixedly arranged on the piston and at least partially clamped between the piston and the inner wall of the needle cylinder, at least three sealing rings are convexly arranged on the outer wall of the sealing plug, the sealing rings abut against the inner wall of the needle cylinder, and a fillet is formed on one side of the sealing rings abutting against the needle cylinder.

2. The syringe of claim 1 wherein said plunger comprises a cylindrical section and a tapered section connecting said cylindrical section, said tapered section being connected to one end of said cylindrical section;

the sealing plug includes first cover portion of establishing and connects the first second cover portion of establishing, first cover portion of establishing overlaps to be located outside the toper section, the second cover portion of establishing overlap is located outside the cylinder section, the second cover portion of establishing presss from both sides and locates the piston with between the inner wall of cylinder, the sealing washer is protruding to be located the second cover portion of establishing.

3. The syringe of claim 2 wherein said cylindrical section comprises a first cylindrical section and a second cylindrical section; the conical section is connected to one end of the first cylindrical section, the second cylindrical section is connected to one end, away from the conical section, of the first cylindrical section, and the outer diameter of the first cylindrical section is smaller than that of the second cylindrical section; the second sleeving part is sleeved outside the first cylindrical section.

4. The syringe of claim 3 wherein the outer wall of the first cylindrical section defines a recess, and the inner wall of the second nesting portion defines a projection that snaps into the recess.

5. The syringe of claim 3 wherein an end of the second cylindrical section facing away from the first cylindrical section defines an insertion slot for insertion of a plunger.

6. The injector of claim 5, wherein an end surface of the second cylindrical section facing away from the first cylindrical section is convexly provided with at least two snap-in portions, the at least two snap-in portions being symmetrically arranged about a center of the end surface.

7. The syringe of any one of claims 1 to 6 wherein the thickness dimension of the sealing ring decreases from the axis of the barrel to the inner wall of the barrel.

8. Syringe according to any one of claims 1 to 6, in which the height of the projection of the sealing ring decreases progressively in the direction of advancement of the injection.

9. The syringe of any one of claims 1 to 6 wherein the spacing between each adjacent pair of said sealing rings is progressively reduced in the direction of injection advancement.

10. The syringe according to any one of claims 1 to 6, wherein the sealing ring is made of rubber or silica gel; the piston is made of acrylonitrile-butadiene-styrene copolymer or polycarbonate.