CN217014942U

CN217014942U - Syringe

Info

Publication number: CN217014942U
Application number: CN202123030591.1U
Authority: CN
Inventors: 洪铭婉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-04
Filing date: 2021-12-04
Publication date: 2022-07-22
Anticipated expiration: 2031-12-04

Abstract

The utility model belongs to the technical field of syringes, in particular to a novel self-destruction syringe. Comprises a needle point, a needle seat and a needle cylinder, wherein the needle seat is arranged in the front section part of the needle cylinder; the core bar is movably arranged in the needle cylinder, the front end of the core bar is provided with a rubber plug, and the peripheral surface of the rubber plug is clung to the inner wall of the needle cylinder; the piston ring is sleeved at the rear end of the needle seat, and the peripheral wall of the piston ring is tightly attached to the inner wall of the needle cylinder; the middle part of the rubber plug is provided with a pierceable part, one end of the needle seat far away from the needle point is provided with a needle part, the needle part is provided with at least one flow guide channel for the liquid medicine to pass through, a channel for the liquid medicine to pass through is arranged in the needle seat, the front end of the channel is inserted with the needle point, and the rear end of the channel is communicated with the flow guide channel; a stop ring is formed on the front side of the front section part, and a closed air pressure cavity is formed between the stop ring and the piston ring. The utility model aims to provide a self-destruction syringe which is simple in structure and rapid in needle point retraction.

Description

Syringe

Technical Field

The utility model belongs to the technical field of syringes, in particular to a novel self-destruction syringe.

Background

The syringe is a common medical device, and along with the wide application of the syringe, in order to avoid cross infection or accidental injury to users, a plurality of self-destruction syringes appear on the market, which are disposable syringe products capable of preventing repeated use after use.

Chinese patent 202110231798.0 discloses a self-destruction syringe, which has the following problems in the use process:

1. when the core rod retreats to the tail of the needle cylinder and then is pushed forwards, the inner wall of the needle cylinder has smaller constraint on the core rod, so that the shaking angle of the core rod is larger, and the use of the injector is not facilitated; the rocking angle is too large, which may cause leakage of the liquid medicine or increase resistance to propulsion.

2. The specification of the needle head is generally marked by the color of the needle seat, and specifically refers to a disposable injection needle identification color code YY/T0296-1997; the color of the needle seat is formed by adding colorant in the injection molding process; in the process of injecting the liquid medicine, the liquid medicine can pass through the needle seat, and certain potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a safe and reliable injector with a simple structure.

The purpose of the utility model is realized by the following steps:

an injector comprises a needle cylinder, a needle rod assembly and a needle head assembly, wherein a first step part and a second step part are arranged on the inner wall of the lower part of the needle cylinder; first step portion and second step portion divide the syringe inner wall into:

the first inner diameter part is positioned on the inner wall of the needle cylinder on the upper side of the first step part; the inner diameter of the inner diameter part I is smaller than the diameter of the rubber plug of the needle bar component in a natural unfolding state;

the inner diameter part II is positioned on the inner wall of the needle cylinder between the first step part and the second step part; the inner diameter of the inner diameter part II is matched with the diameter of the rubber plug in a natural stretching state;

the inner diameter part III is positioned on the inner wall of the needle cylinder at the lower side of the second step part;

and a ring sleeve is embedded on the third inner diameter part.

Preferably, the ring sleeve is a heterochromatic ring, and the inner diameter of the ring sleeve is less than or equal to that of the inner diameter part II.

Preferably, the lower edge of the first inner diameter part protrudes inwards to form a first check ring;

the inner diameter of the ring sleeve is the same as that of the inner diameter part II.

Preferably, the inner wall of the ring sleeve is provided with a second anti-return ring protruding inwards;

the distance between the second stopping ring and the first step part is greater than or equal to the length of the rubber plug.

Preferably, the lower end of the needle cylinder has an inside diameter matched to an outside diameter of the lower end of the needle bar assembly so that the lower end of the needle bar assembly can be inserted into the needle cylinder.

Preferably, a third step part is further arranged on the inner wall of the lower part of the needle cylinder; an inner diameter part is formed between the third step part and the lower end edge of the needle cylinder.

Preferably, the inner wall of the inner diameter part IV protrudes inwards to form a third retaining ring; the lower edge of the ring sleeve abuts against the third anti-backing ring.

Preferably, the first step part is positioned at the upper side of the finger flange of the syringe; the second step portion is located on the lower side of the finger flange of the needle cylinder.

Preferably, the needle bar assembly comprises

The middle part of the core rod is provided with a cavity which is communicated up and down;

the plug is clamped at the upper end part of the core rod and can retract into the cavity under the action of certain external force;

the tail plug is clamped at the lower end part of the core rod and is used for preventing the plug from falling out of the core rod;

the needle assembly comprises

A needle seat provided with a needle tip and arranged at the upper end part of the needle cylinder;

a positioning ring for fixing the needle seat on the upper end of the needle cylinder; the positioning ring is sleeved outside the lower end of the needle base and can be separated from the needle base under the pushing of the upper end part of the core rod;

and the spring is sleeved on the upper part of the needle seat and can eject the needle seat into the cavity when the positioning ring is separated from the needle seat.

Preferably, the front end part of the plug is provided with an embedded end; when the core rod is pushed to abut against the lower side of the positioning ring, the embedded end extends into the liquid outlet hole at the lower end of the needle seat, so that the plug and the needle seat are connected into a whole in a clamping mode.

Compared with the prior art, the utility model has the outstanding and beneficial technical effects that:

the inner wall of the needle cylinder is divided into the first inner diameter part, the second inner diameter part and the third inner diameter part, and in the assembling process, the rubber plug can be easily placed into the second inner diameter part and then is contracted and deformed into the first inner diameter part by slight force; the ring sleeve is embedded on the inner diameter part III, so that the movement range of the core rod is further limited, the deflection of transition is prevented, the hand feeling is improved, and the safety performance is improved.

The ring sleeve can be colored, the color of the ring sleeve can be directly observed through the transparent needle cylinder, and the color of the ring sleeve corresponds to the specification of the needle point; the needle stand does not need to add pigment masterbatch, and the liquid medicine passes through transparent needle stand, and its security performance is better.

The first stopping ring can prevent the rubber plug from easily withdrawing from the needle cylinder, and the position is the set maximum injection amount of the needle cylinder; the inner diameter of the ring sleeve is the same as that of the inner diameter part II, so that when the rubber plug enters, no extra resistance is generated. The check ring II can ensure that the rubber plug cannot easily fall off the ring sleeve in a natural state; the maximum stroke of the needle rod assembly extending into the needle cylinder is consistent with the length of the needle rod assembly, and the inner diameter of the lower end part of the needle cylinder is basically the same as the outer diameter of the lower end part of the needle rod assembly, so that after the liquid medicine is injected, the lower end of the needle rod assembly just extends into the needle cylinder completely, the needle rod assembly cannot be pulled out from the tail end under force application, and the self-destruction effect is improved.

The front end part of the plug is provided with an embedded end; when the core rod is pushed to abut against the lower side of the positioning ring, the embedded end extends into the liquid outlet hole at the lower end of the needle seat, so that the plug and the needle seat are clamped into a whole; ensures that the liquid medicine can not leak from the cavity of the core rod in advance in the injection process.

Drawings

Fig. 1 is an exploded view of the present invention.

Fig. 2 is a schematic view of the lower portion of the cylinder of the present invention.

Fig. 3 is a schematic view of the syringe and needle shaft assembly of the present invention.

Fig. 4 is an enlarged view of fig. 4 at a.

Fig. 5 is a schematic of the present invention.

Fig. 6 is an enlarged view of fig. 5 at B.

Detailed Description

The utility model is further described in the following with specific embodiments in conjunction with the accompanying drawings, see fig. 1-6:

an injector comprises a syringe 2, a needle bar assembly 200 and a needle assembly 100, wherein a first step part 28 and a second step part 27 are arranged on the inner wall of the lower part of the syringe 2; the first step 28 and the second step 27 divide the syringe inner wall into:

an inner diameter portion 21 located on the inner wall of the syringe above the first stepped portion 28; the inner diameter of the inner diameter part one 21 is smaller than the diameter of the rubber plug 7 of the needle bar assembly 200 in a natural stretching state; the first inner diameter part of the rubber plug is extruded and deformed and is in sealing fit with the inner wall of the needle cylinder, so that the effect of pushing the liquid medicine is achieved;

an inner diameter part 22 located on the inner wall of the syringe between the first step 28 and the second step 27; the inner diameter of the inner diameter part 22 is matched with the diameter of the rubber plug 7 in a natural stretching state; the second inner diameter part is mainly designed to guide the rubber plug, so that the assembly is convenient; in the assembling process, the rubber plug 7 can be easily placed into the second inner diameter part, and then the rubber plug is contracted and deformed into the first inner diameter part by slight force;

an inner diameter part third 24 positioned on the inner wall of the syringe below the second step part 27;

the inner diameter part 24 is embedded with a ring sleeve 3. The rubber plug is flexible, and the size of the core bar is smaller than the inner diameter of the needle cylinder, so that the core bar can rock within a certain range; in addition, based on the self-destruction syringe, the top end of the rubber plug is opened, so that the installation of the plug and the bouncing of the needle stand into the inner cavity of the core rod are facilitated; therefore, the stability of the rubber plug of the self-destruction syringe is inferior to that of the traditional syringe, and the shaking amount of the core bar is larger; according to the application, by the design of additionally arranging the ring sleeve, the moving range of the core rod is limited, the deflection of transition is prevented, the hand feeling is improved, and the safety performance is improved.

Preferably, the ring sleeve 3 is a heterochromatic ring, and the inner diameter of the ring sleeve 3 is less than or equal to that of the inner diameter part two 22. The ring sleeve can be colored, the color of the ring sleeve can be directly observed through the transparent needle cylinder, and the color of the ring sleeve corresponds to the specification of the needle point; the needle base does not need to be added with pigment color master, the liquid medicine passes through the transparent needle base, and the safety performance is better.

The corresponding rules of the ring cover color and the needle tip are in accordance with YY/T0296-1997 color codes of disposable injection needles identification, such as:

nominal outer diameter of needle (mm)	Colour(s)
		0.3	Yellow colour
0.33	Red (Red)
		0.36	Blue-green
...	...

Preferably, the lower edge of the first inner diameter portion 21 protrudes inwards to form a first check ring 29, which can prevent the rubber plug from easily exiting the syringe, and this position is also the maximum injection amount set by the syringe;

the inner diameter of the ring sleeve 3 is the same as that of the inner diameter part 22, so that when the rubber plug enters, no additional resistance is generated. The check ring II can ensure that the rubber plug cannot easily fall off the ring sleeve in a natural state;

preferably, the inner wall of the ring sleeve 3 is provided with a second inward-protruding anti-return ring 31;

the distance between the second stopping ring 31 and the first step 28 is greater than or equal to the length of the rubber plug 7.

Preferably, the lower end of the cylinder 2 has an inner diameter matched with an outer diameter of the lower end of the needle bar assembly 200 such that the lower end of the needle bar assembly 200 can be inserted into the cylinder 2. The maximum stroke of the needle rod assembly extending into the needle cylinder is consistent with the length of the needle rod assembly, after the liquid medicine is injected, the lower end of the needle rod assembly just extends into the needle cylinder completely, the needle rod assembly cannot be pulled out from the tail end in a force application mode, and the self-destruction effect is improved.

Preferably, a third step part 25 is further arranged on the inner wall of the lower part of the needle cylinder 2; an inner diameter portion 221 is formed between the third step portion 25 and the lower end edge of the cylinder.

Preferably, the inner wall of the inner diameter part four 221 protrudes inwards to form a third anti-backing ring 26; the lower edge of the ring sleeve 3 abuts against the third anti-back ring 26.

Preferably, said first step 28 is located on the upper side of the finger flange 23 of the syringe; the second step 27 is located on the underside of the finger flange 23 of the barrel.

Preferably, the needle bar assembly 200 includes

The middle part of the core rod 9 is provided with a cavity 91 which is communicated up and down;

a plug 8 clamped at the upper end of the core rod 9 and capable of retracting into the cavity 91 under the action of a certain external force;

and the tail plug 10 is clamped at the lower end part of the core rod 9 and used for preventing the plug 8 from falling out of the core rod.

The needle assembly 100 includes

A needle seat 4 with a needle tip, which is arranged at the upper end part of the needle cylinder 2;

a positioning ring 6 for fixing the needle holder 4 to the upper end of the cylinder 2; the positioning ring 6 is sleeved outside the lower end of the needle seat 4 and can be separated from the needle seat 4 under the pushing of the upper end part of the core rod 9;

and the spring 5 is sleeved on the upper part of the needle seat 4 and can eject the needle seat 4 into the cavity 91 when the positioning ring 6 is separated from the needle seat 4.

Preferably, the front end of the plug 8 is provided with an embedded end 81; when the core rod 9 is pushed to abut against the lower side of the positioning ring 6, the embedded end 81 extends into the liquid outlet hole at the lower end of the needle seat 4, so that the plug 8 and the needle seat 4 are clamped into a whole. Ensures that the liquid medicine cannot leak from the cavity of the core rod in advance during the injection process, and can reduce the residual quantity of the liquid medicine.

The stable effect of ring cover: as shown in fig. 3 and 4, when the rubber plug 7 is located at the first 29 position of the anti-back ring, under the condition that no ring sleeve is arranged, the supporting point at the lower end of the core rod is located at the position a1, and after the ring sleeve is additionally arranged, the supporting point at the lower end of the core rod is located at the position a2, so that the shaking space of the core rod is reduced by the angle a3, and the angle a3 can reach 2-4 degrees, thereby reducing the propelling assistance of the core rod, improving the operation stability and improving the safety performance.

The marking effect of the ring sleeve is as follows: the ring sleeve is not contacted with the liquid medicine, and the needle seat is required to be contacted with the liquid medicine; therefore, the ring sleeve is used as a color mark which is obviously superior to the needle seat.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, and such changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. An injector comprises a syringe (2), a needle rod component (200) and a needle head component (100), and is characterized in that a first step part (28) and a second step part (27) are arranged on the inner wall of the lower part of the syringe (2); the first step (28) and the second step (27) divide the syringe inner wall into:

a first inner diameter part (21) positioned on the inner wall of the syringe on the upper side of the first step part (28); the inner diameter of the inner diameter part I (21) is smaller than the diameter of the rubber plug (7) of the needle bar assembly (200) in a natural stretching state;

a second inner diameter part (22) which is positioned on the inner wall of the syringe between the first step part (28) and the second step part (27); the inner diameter of the inner diameter part II (22) is matched with the diameter of the rubber plug (7) in a natural stretching state;

an inner diameter part III (24) which is positioned on the inner wall of the syringe below the second step part (27);

and a ring sleeve (3) is embedded on the inner diameter part III (24).

2. A syringe according to claim 1, wherein: the ring sleeve (3) is a heterochromatic ring, and the color of the ring sleeve (3) corresponds to the specification of the needle head assembly; the inner diameter of the ring sleeve (3) is less than or equal to the inner diameter of the inner diameter part II (22).

3. A syringe according to claim 1, wherein: the lower edge of the inner diameter part I (21) protrudes inwards to form a first check ring I (29);

the inner diameter of the ring sleeve (3) is the same as that of the inner diameter part (22).

4. A syringe according to claim 3, wherein: a second check ring (31) which protrudes inwards is arranged on the inner wall of the ring sleeve (3);

the distance between the second stopping ring (31) and the first step part (28) is greater than or equal to the length of the rubber plug (7).

5. A syringe according to claim 1, wherein: the inner diameter of the lower end part of the needle cylinder (2) is matched with the outer diameter of the lower end of the needle rod component (200), so that the lower end of the needle rod component (200) can extend into the needle cylinder (2); the maximum distance of the needle bar component extending into the needle cylinder is consistent with the length of the needle bar component.

6. A syringe according to claim 1, wherein: a third step part (25) is also arranged on the inner wall of the lower part of the needle cylinder (2); an inner diameter part (221) is formed between the third step part (25) and the lower end edge of the needle cylinder.

7. A syringe according to claim 6, wherein: the inner wall of the inner diameter part four (221) protrudes inwards to form a third anti-return ring (26); the lower edge of the ring sleeve (3) abuts against the third anti-return ring (26).

8. A syringe according to claim 1, wherein: the first step part (28) is positioned on the upper side of the finger flange (23) of the needle cylinder; the second step (27) is located on the underside of the finger flange (23) of the syringe.

9. A syringe according to claim 1, wherein: the needle bar assembly (200) comprises

A core bar (9), wherein the middle part of the core bar is provided with a cavity (91) which is communicated up and down;

the plug (8) is clamped at the upper end part of the core rod (9) and can retract into the cavity (91) under the action of certain external force;

the tail plug (10) is clamped at the lower end part of the core rod (9) and is used for preventing the plug (8) from falling out of the core rod;

the needle assembly (100) comprises

A needle seat (4) provided with a needle tip, which is arranged at the upper end part of the needle cylinder (2);

a positioning ring (6) for fixing the needle seat (4) at the upper end of the needle cylinder (2); the positioning ring (6) is sleeved outside the lower end of the needle seat (4) and can be separated from the needle seat (4) under the pushing of the upper end part of the core rod (9);

and the spring (5) is sleeved on the upper part of the needle seat (4) and can eject the needle seat (4) into the cavity (91) when the positioning ring (6) is separated from the needle seat (4).

10. A syringe according to claim 9, wherein: an embedded end (81) is arranged at the front end part of the plug (8); when the core rod (9) is pushed to abut against the lower side of the positioning ring (6), the embedded end (81) extends into the liquid outlet hole at the lower end of the needle seat (4), so that the plug (8) and the needle seat (4) are connected into a whole in a clamping mode.