CN213667135U

CN213667135U - Disposable negative pressure syringe

Info

Publication number: CN213667135U
Application number: CN202022460279.5U
Authority: CN
Inventors: 张建军; 丁洁; 马海鸿; 朱秋菊; 孟月琴; 高扬
Original assignee: URUMQI MATERNAL AND CHILD HEALTH HOSPITAL
Current assignee: URUMQI MATERNAL AND CHILD HEALTH HOSPITAL
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-07-13
Anticipated expiration: 2030-10-30

Abstract

The utility model provides a disposable negative pressure injector, which consists of a needle cylinder, a core bar, a needle body and a rubber plug, wherein, the four surfaces of the cross-shaped core bar are provided with continuous latch teeth, the tail end of the needle cylinder is provided with a clamping groove running through the side wall of the needle cylinder, and a limit latch pin inserted from the clamping groove is matched with the latch teeth to play the role of limiting the movement of the core bar and simultaneously prevent the core bar from sliding downwards due to the influence of negative pressure so as to maintain the required negative pressure state in the needle cylinder; the negative pressure in the needle cylinder can be relieved only by lifting the core rod and rotating a certain angle; a plurality of side holes communicated with the needle body channel are arranged at the needle head part of the needle body; the structure is simple, the cost is low, and the disposable use condition can be met; the operation is convenient and fast, and can be completed by a single person with one hand, so that the operation accuracy is improved; the needle head is designed to be porous, so that the needle head is not easy to block and has good smoothness; the shape and the specification of the injector are consistent with those of the injector which is widely used at present, and the injector is easy to popularize and use.

Description

Disposable negative pressure syringe

Technical Field

The utility model belongs to a medical appliance, in particular to a negative pressure injection appliance.

Background

The negative pressure syringe is usually used for extracting inhomogeneous liquids such as pus, ascites, pleural effusion and the like, when the liquid is thick, the negative pressure in the syringe is increased due to slow liquid flow, the time consumption is long, and the finger force is difficult to maintain the negative pressure state in the syringe for a long time, especially under the condition of more patients. In order to solve the problem, most of the prior negative pressure injectors are provided with bayonets on plungers, and baffles or bayonets are arranged in the outlets of the injectors or in a needle cylinder to keep the negative pressure state in the needle cylinder; or the top of the plunger is provided with a screw and a nut, and the negative pressure state in the needle cylinder is increased or kept by rotating the screw. The existing negative pressure injector is complex in design and high in cost, needs to be operated by two hands in a matched mode, even needs to be operated by two persons in a matched mode, and is easy to interfere with the precision of puncture operation; when the negative pressure injector is used, the negative pressure state in the injector needs to be frequently regulated, and when a needle hole is clogged, the negative pressure needs to be timely relieved, so that tissues or blood clots and the like are prevented from being sucked into the needle hole to block a needle channel; after liquid is sucked into the needle cylinder, the negative pressure in the needle cylinder is reduced, and the plunger needs to be lifted in time to keep enough negative pressure so as to be beneficial to sucking out the liquid. The existing negative pressure injector is difficult to rapidly change the negative pressure state in the needle cylinder, and the operation is very inconvenient; in addition, the needle head of the negative pressure syringe only has one needle hole, and is easy to block.

At present, no practical technical solution is available.

Disclosure of Invention

The utility model aims to overcome the defects of the prior negative pressure injector, and provides a disposable negative pressure injector which comprises a needle cylinder, a core rod, a needle body and a rubber plug, wherein the four surfaces of the cross-shaped core rod are provided with continuous latch teeth, the tail end of the needle cylinder is provided with a clamping groove running through the side wall of the needle cylinder, and a limiting bayonet lock inserted from the clamping groove is matched with the latch teeth to play the role of limiting the movement of the core rod and prevent the core rod from sliding downwards due to the influence of negative pressure so as to maintain the required negative pressure state in the needle cylinder; the negative pressure in the needle cylinder can be relieved only by lifting the core rod and rotating a certain angle; the needle head part of the needle body is provided with a plurality of side holes communicated with the needle body channel, which is beneficial to keeping the smoothness of drainage and reducing the blockage phenomenon of the needle hole.

The utility model relates to a disposable negative pressure syringe, which consists of a syringe (1), a core bar (2), a needle body (8) and a rubber plug (12); the negative pressure injector is provided with continuous latch teeth (3) on a cross-shaped core rod (2), the upper end edge of the latch teeth is an arc-shaped edge, and the lower end edge of the latch teeth is a flat edge; the tail end of the needle cylinder (1) is provided with a clamping groove (7) which runs through the side wall of the needle cylinder; the limiting bayonet lock (4) consists of an arc-shaped clamping handle (5) and a clamping tongue (6), and the clamping handle and the clamping tongue are mutually vertically combined into a whole;

the needle head part of the needle body (8) is provided with a plurality of side holes (9) which are communicated with the needle body channel.

The cross section of the clamping tongue (6) of the limiting clamping pin (4) is slightly smaller than that of the clamping groove (7).

The size of the clamping handle (5) of the limiting clamping pin (4) is larger than that of the clamping groove (7), and the arc-shaped surface of the limiting clamping pin is attached to the outer cylinder wall of the needle cylinder (1).

A disposable negative pressure syringe beneficial effect be:

(1) the structure is simple, the cost is low, and the disposable use condition can be met;

(2) the operation is convenient and fast, and can be completed by a single person with one hand, so that the operation accuracy is improved;

(3) the needle head is designed to be porous, so that the needle head is not easy to block and has good smoothness;

(4) the shape and the specification of the injector are consistent with those of the injector which is widely used at present, and the injector is easy to popularize and use.

Drawings

FIG. 1 is an overall structure diagram of the present invention;

FIG. 2 is a view showing the structure of the needle body of the present invention;

FIG. 3 is a structural diagram of the core bar of the present invention;

fig. 4 is a schematic structural view of the limiting bayonet lock and the clamping groove of the present invention.

Legend: 1. the syringe comprises a syringe body, 2, a core rod, 3, a latch, 4, a limiting bayonet lock, 5, a clamping handle, 6, a clamping tongue, 7, a clamping groove, 8, a needle body, 9, a side hole, 10, a needle head seat, 11, a syringe mastoid, 12 and a rubber plug.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, it is right to combine the embodiment below the utility model discloses carry out detailed explanation. The embodiments of the present invention are presented to facilitate better understanding, but are not limiting of the present invention. The components and materials used in the examples are commercially available unless otherwise specified.

As shown in fig. 1 and 3, the disposable negative pressure syringe of the present invention comprises a syringe 1, a core rod 2, a needle body 8 and a rubber plug 12; the negative pressure injector is realized by improving a needle cylinder, a core bar and a needle body of the prior negative pressure injector; the rod body of the core rod 2 is in a cross shape, the lower end of the core rod is connected with a cylindrical rubber plug 12 into a whole, the four surfaces of the core rod 2 above the rubber plug 12 are provided with continuous latch teeth 3, the upper end edge of the latch teeth is an arc edge, the lower end edge of the latch teeth is a straight edge, the straight edge of the latch teeth 3 is matched with a latch tongue 6 of a limiting latch pin 4 inserted into a latch groove 7, the movement limiting effect on the core rod 2 is achieved, the core rod 2 is prevented from moving downwards under the action of negative pressure, and the negative pressure in the needle cylinder 1 is kept in a relatively constant state; the core rod is lifted up and simultaneously rotates for a certain angle, the latch 3 is staggered with the limit bayonet 4, and the negative pressure in the needle cylinder 1 can be relieved;

as shown in fig. 1 and 4, a clamping groove 7 penetrating through the side wall of the needle cylinder 1 is formed at the tail end of the needle cylinder 1, and the length and the width of the clamping groove are slightly larger than the sectional dimension of the clamping tongue 6 so as to limit the clamping pin 4 to be inserted and pulled out;

as shown in fig. 4, the limiting bayonet 4 is composed of an arc-shaped clamping handle 5 and a clamping tongue 6 which are vertically combined into a whole; the section size of the clamping tongue 6 is slightly smaller than that of the clamping groove 7, so that the limiting clamping pin 4 can be conveniently inserted into and pulled out of the clamping groove 7, and the core rod 2 is prevented from descending under the influence of negative pressure by the fact that the clamping tongue 6 is matched with the straight edge of the clamping teeth 3; the size of the cambered surface of the clamping handle 5 is larger than that of the clamping groove 7, after the clamping tongue 6 is inserted into the clamping groove 7, the cambered surface of the clamping tongue is attached to the outer cylinder wall of the needle cylinder 1, so that the clamping tongue is convenient for the insertion and extraction operation of the limiting clamping pin 4, and meanwhile, the relative fixation of the limiting clamping pin 4 and the needle cylinder 1 is facilitated;

the syringe 1, the core bar 2 and the limiting bayonet 4 can be made of high-transparent medical grade polypropylene (PP), and the rubber plug 12 can be made of high-elasticity and low-temperature-resistant medical grade polypropylene (PP);

as shown in fig. 1 and 2, a plurality of side holes 9 communicated with the needle body channel are arranged at the needle head part of the needle body 8, and the porous structure can enhance the liquid circulation, effectively reduce the blockage phenomenon of the needle hole and keep the smooth drainage; the needle body 8 is made of medical stainless steel.

The operating principle and the method of the negative pressure injector are as follows:

(1) cleaning and disinfecting the local part of the puncture part;

(2) the rubber plug 12 is placed at the optimal position by using the core rod 2, and the limiting bayonet 4 is inserted into the clamping groove 7;

(3) the disposable negative pressure injector is held by hand, and the needle body 8 is placed into the puncture pus cavity under the ultrasonic guidance;

(4) the core rod 2 is pulled out of the syringe 1, the syringe 1 is in a negative pressure state, when the negative pressure is large enough, the core rod 2 is stopped being pulled out, the core rod 2 is rotated moderately, the latch 3 is matched with the limiting bayonet 4 to fix the position of the core rod 2, and liquid is continuously sucked into the syringe 1 under the action of the negative pressure;

(5) when the negative pressure in the needle cylinder 1 needs to be increased continuously, the operation of the step (4) is repeated;

(6) after the liquid pumping operation is completed, the core rod 2 is appropriately pulled outwards and rotated by an appropriate angle, and the negative pressure can be relieved.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the claims of the present invention. While the foregoing description will be understood and appreciated by those skilled in the relevant art, other equivalents may be made thereto without departing from the scope of the claims.

Claims

1. A disposable negative pressure syringe is characterized in that: the negative pressure injector consists of a syringe (1), a core rod (2), a needle body (8) and a rubber plug (12), wherein the cross-shaped core rod (2) is provided with continuous latch teeth (3), the upper end edge of the cross-shaped core rod is an arc edge, and the lower end edge of the cross-shaped core rod is a flat edge; the tail end of the needle cylinder (1) is provided with a clamping groove (7) which runs through the side wall of the needle cylinder; the limiting bayonet lock (4) consists of an arc-shaped clamping handle (5) and a clamping tongue (6), and the clamping handle and the clamping tongue are mutually vertically combined into a whole; the needle head part of the needle body (8) is provided with a plurality of side holes (9) which are communicated with the needle body channel.

2. The disposable negative pressure syringe of claim 1, wherein: the cross section of the clamping tongue (6) of the limiting clamping pin (4) is slightly smaller than that of the clamping groove (7).

3. The disposable negative pressure syringe of claim 1, wherein: the size of the clamping handle (5) is larger than that of the clamping groove (7), and the arc-shaped surface of the clamping handle is attached to the outer cylinder wall of the needle cylinder (1).