CN219375483U - Injection syringe - Google Patents

Abstract

The utility model discloses an injector, which comprises a bobbin, an injection needle and a needle fixing seat; one end of the bobbin is provided with a connecting part, the connecting part is positioned in the center of the end face of the bobbin, and the end face of the bobbin is round; the injection needle is provided with a needle body and a needle head, the needle body is fixed on the needle fixing seat, and the needle head is used for puncturing; the needle body is internally provided with a first cavity which is communicated with the bobbin and is used for extracting or injecting liquid; the needle fixing seat is provided with a first connecting end which is connected with the connecting part; the projection of the needle head on the end face of the bobbin is positioned at the center of the end face of the bobbin. The injector provided by the utility model can facilitate machine calibration in the process of automatically configuring medicines, and improves the efficiency.

Description

Injection syringe

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an injector.

Background

Current syringes can be largely classified into syringes for configuring a medicine and syringes for human injection, which cannot be used for human injection, according to functional distinction. With the development of automation technology, machines have emerged that can dispense medications by controlling syringes, with far greater efficiency than manual dispensing.

Syringes currently on the market for dispensing medications are mainly used for manual dispensing, and for ease of manual operation, the needle of a syringe with a capacity of 20-50 ml is arranged off-center from the barrel, but when dispensing medications by a machine, calibration is not favored, resulting in lower efficiency.

Disclosure of Invention

The utility model aims to solve the problem that the prior syringes with the volume of 20-50 milliliters in the market are not beneficial to calibration and cause lower efficiency when the medicaments are automatically prepared by a machine. The utility model provides an injector which can facilitate machine calibration and improve efficiency.

In order to solve the technical problems, an embodiment of the utility model discloses an injector, which comprises a bobbin, an injection needle and a needle fixing seat;

one end of the bobbin is provided with a connecting part, the connecting part is positioned in the center of the end face of the bobbin, and the end face of the bobbin is round;

the injection needle is provided with a needle body and a needle head, the needle body is fixed on the needle fixing seat, and the needle head is used for puncturing;

the needle body is internally provided with a first cavity which is communicated with the bobbin and is used for extracting or injecting liquid;

the needle fixing seat is provided with a first connecting end which is connected with the connecting part;

the projection of the needle head on the end face of the bobbin is positioned at the center of the end face of the bobbin.

By adopting the technical scheme, the projection of the needle head on the end face of the bobbin is positioned at the center of the end face of the bobbin, so that the machine is convenient to calibrate, the automatic configuration speed can be effectively improved, and the efficiency is improved.

According to another embodiment of the utility model, the capacity of the cartridge is 20-50 ml.

According to another specific embodiment of the utility model, the needle head is in a solid cone shape, and is close to the needle head along the length direction of the needle body, and the needle body is provided with a through hole for liquid to enter or leave the first cavity; or (b)

The needle head is an oblique incision.

By adopting the technical scheme, the through hole is formed in the needle body, and meanwhile, the needle head is in a solid cone shape, so that the injection and extraction functions of the injection needle are guaranteed, the puncture capability of the needle head is enhanced, and the structural strength of the needle head is guaranteed.

According to another specific embodiment of the utility model, the number of the through holes is two, and the two through holes are oppositely arranged along the radial direction of the needle body.

By adopting the technical scheme, the two through holes which are opposite along the radial direction are arranged, so that the efficiency of liquid extraction and injection can be improved.

According to another embodiment of the utility model, the connecting portion comprises a first annular protrusion extending along the axial direction, an inner wall of the first annular protrusion is provided with an inner thread, the first connecting end is a second annular protrusion extending along the axial direction, the second annular protrusion is provided with an outer thread, and the inner thread is in threaded fit with the outer thread to fix the first connecting end and the first annular protrusion.

According to another embodiment of the utility model, the connecting portion comprises a second connecting end, the first annular projection surrounds the second connecting end, and the outer diameter of the second connecting end decreases in a direction axially away from the bobbin;

a second cavity is formed in the second connecting end, one end of the second cavity is communicated with the bobbin, and the other end of the second cavity is communicated with the first cavity;

along the axial orientation the direction of bobbin, the internal diameter of first link increases gradually, the inner wall of first link laminating in the outer wall of second link.

According to another embodiment of the utility model, the needle holder is provided with an exhaust channel;

the needle body is provided with a first exhaust port;

the exhaust channel is communicated with the first cavity through the first exhaust port and is used for exhausting gas in the first cavity.

By adopting the technical scheme, the gas in the first cavity can be discharged, and the extracted liquid is prevented from being polluted.

According to another specific embodiment of the utility model, a second exhaust port is arranged at one end, close to the connecting part, of the needle fixing seat along the axial direction;

the second exhaust port is communicated with the exhaust channel and is used for exhausting gas out of the needle fixing seat;

the second exhaust port is provided with an air filtering membrane, and the air filtering membrane is used for preventing external air from entering the exhaust channel through the second exhaust port and preventing liquid from leaking.

According to another embodiment of the utility model, the needle holder comprises a first holder;

the first connecting end is arranged on the radial end face of the first fixing seat along the axial direction, and the radial end face faces the bobbin;

the first fixing seat comprises an outer pipe and an inner pipe, and the outer pipe surrounds the inner pipe;

the outer tube and the inner tube form an annular cavity along the radial direction, a part of the annular cavity forms the exhaust channel, and the inner tube is sleeved on the needle body;

the second exhaust port is arranged on the radial end face and surrounds the first connecting end.

According to another embodiment of the utility model, the needle holder comprises a second holder and a sleeve, the exhaust channel comprising a first exhaust section and a second exhaust section distributed in axial direction;

the second fixing seat is provided with a first part and a second part, and the inner diameter of the first part is larger than that of the second part;

the joint of the first part and the second part is a connecting end face;

the sleeve and the second fixing seat are inserted into the annular cavity along the axial direction and are abutted against the air filtering membrane;

the sleeve and the inner wall of the first part are arranged at intervals along the radial direction to form the first exhaust section, the inner wall of the second part and the needle body are arranged at intervals to form the second exhaust section, the sleeve is sleeved on the inner pipe, and the first exhaust section is communicated with the second exhaust port;

one end of the sleeve is abutted against the air filtering membrane along the axial direction, and the other end of the sleeve is abutted against the connecting end face;

the sleeve is provided with a third exhaust port, and the first exhaust section and the second exhaust section are communicated through the third exhaust port;

the first exhaust port is communicated with the second exhaust section.

According to another embodiment of the utility model, the needle body is in interference fit with the inner tube; or (b)

The needle fixing seat is injection molded on the needle body.

Drawings

FIG. 1 shows a perspective view of a syringe according to an embodiment of the present utility model;

FIG. 2 shows a partial cross-sectional view of a needle mount and connection portion of a syringe according to an embodiment of the utility model;

FIG. 3 shows a projection of the needle of a syringe on the end face of a barrel according to an embodiment of the present utility model;

fig. 4 (a) is a schematic view showing the structure of an injection needle of an injector according to an embodiment of the present utility model;

fig. 4 (b) shows a cross-sectional view of the injection needle of the syringe according to the embodiment of the present utility model in another direction;

fig. 5 shows a schematic view of the radial end face of an injector according to an embodiment of the present utility model.

Reference numerals illustrate:

1. the cartridge comprises a barrel, 10, a barrel end face, 11, a connecting portion, 111, a second connecting end, 112, a second cavity, 113, an outer wall of the second connecting end, 2, a needle holder, 21, a first holder, 211, a first connecting end, 212, an inner wall of the first connecting end, 213, a second air outlet, 214, a radial end face, 215, an outer tube, 216, an inner tube, 22, a second holder, 221, a first portion, 2210, an inner wall of the first portion, 222, a second portion, 2220, an inner wall of the second portion, 223, a connecting end face, 23, a sleeve, 231, a third air outlet, 24, an air outlet channel, 241, a first air outlet section, 242, a second air outlet section, 25, an air filter, 3, an injection needle, 31, 32, a needle head, 33, a first cavity, 34, and a through hole.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present utility model with specific examples. While the description of the utility model will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the utility model described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the utility model. The following description contains many specific details for the purpose of providing a thorough understanding of the present utility model. The utility model may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the utility model. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model.

The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, the present application provides a syringe comprising a barrel 1, a needle holder 2 and an injection needle 3.

Wherein, one end of the bobbin 1 is provided with a connecting portion 11, the connecting portion 11 is located at the center of the bobbin end face 10, the bobbin end face 10 is circular, the injection needle 3 is provided with a needle body 31 and a needle head 32, the needle body 31 is fixed on the needle fixing seat 2, the needle head 32 is used for puncturing, a first cavity 33 (not shown in fig. 1) is arranged in the needle body 31, the first cavity 33 is communicated with the bobbin 1, the first cavity 33 is used for extracting or injecting liquid, referring to fig. 2, the needle fixing seat 2 is provided with a first connecting end 211, and the first connecting end 211 is connected with the connecting portion 11.

Specifically, referring to fig. 3, the projection of the needle 32 onto the barrel end face 10 is located at the center of the barrel end face 10, facilitating machine calibration to improve dispensing efficiency.

In some possible embodiments, the capacity of the cartridge 1 is 20-50 milliliters, and the capacity of the cartridge 1 is 30 milliliters, for example.

In some possible embodiments, referring to fig. 4 (a) in combination with (b), the needle 32 is conical and solid, and the needle 31 is provided with a through hole 34 along the length direction X of the needle 31 near the needle 32, the through hole 34 being for liquid to enter or leave the interior of the first cavity 33.

Illustratively, the number of through holes 34 is two, and the two through holes 34 are disposed opposite to each other along the radial direction Y of the needle body 31, so that the efficiency of the syringe in drawing or injecting the liquid can be effectively improved.

The through hole 34 is arranged on the needle body 31, and meanwhile, the needle head 32 is in a solid cone shape, so that the injection and extraction functions of the injection needle 3 are guaranteed, the puncture capability of the needle head 32 is enhanced, and meanwhile, the structural strength of the needle head 32 is guaranteed.

In some possible embodiments, the needle 32 is a bevel cut (not shown), that is, in this embodiment, the needle 32 is formed by cutting along the needle body 31 obliquely, the through hole 34 is located on a cutting surface (not shown), and the cutting angle is not particularly limited, and the cutting angle may be adjusted according to practical needs, for example, the cutting direction forms an angle of 30 degrees with the length direction X of the needle body 31.

In some possible embodiments, with reference to fig. 2, the connection 11 comprises a first annular projection extending in the axial direction X (the axial direction being the same as the length direction of the needle body 31), the inner wall of which is provided with an internal thread, the first connection end 211 being a second annular projection extending in the axial direction X, which is provided with an external thread, the internal thread being in threaded engagement with the external thread to fix the injection needle 3 and the barrel 1.

In some possible embodiments, referring to fig. 2, the connection portion 11 includes a second connection end 111, the first annular protrusion surrounds the second connection end 111, and the outer diameter of the second connection end 111 decreases in a direction away from the bobbin 1 along the axial direction X, specifically, as shown in fig. 2, the outer diameter of the second connection end 111 decreases from a to B.

The second connecting end 111 is provided with a second cavity 112 inside, one end of the second cavity 112 is communicated with the bobbin 1, and the other end is communicated with the first cavity 33.

Specifically, as shown in fig. 2, the inner diameter of the first connection end 211 increases gradually from C to D in the direction of the bobbin 1 along the axial direction X, and the inner wall 212 of the first connection end 211 is bonded to the outer wall 113 of the second connection end 111.

In some possible embodiments, referring to fig. 2, the needle holder 2 is provided with a vent passage 24, the needle body 31 is provided with a first vent (not shown), the vent passage 24 is in communication with the first cavity 33 through the first vent, and the vent passage 24 is used to vent the gas in the first cavity 33.

Specifically, since the needle body 31 is provided with a through hole 34 for liquid to enter or leave the first cavity 33 at a position near the needle head 32 (not shown in fig. 2), or the needle head 32 is an oblique cut, the through hole 34 is located in a tangential plane, and thus air is introduced into or discharged from the first cavity 33 through the through hole 34. When the syringe draws liquid, firstly, the syringe is pierced through the needle 32 and enters the liquid container, so that the through hole 34 can draw the liquid in the container, then the piston rod (not shown) is pulled to start drawing the liquid, in the process, along the length direction X of the needle body 31, the part close to the needle 32 is liquid, the gas is extruded by the liquid to move towards the bobbin 1 along the length direction X, and because the first exhaust port is arranged at the part of the needle body 31 in the needle fixing seat 2, the gas enters the exhaust channel 24 through the first exhaust port, and then the gas is discharged out of the syringe, so that the pollution of the drawn liquid caused by the gas is prevented.

In some possible embodiments, with continued reference to fig. 2, the end of the needle holder 2 adjacent to the connection 11 is provided with a second exhaust opening 213 in the axial direction X. The second exhaust port 213 is in communication with the exhaust passage 24, and the second exhaust port 213 is used for exhausting gas out of the needle holder 2. The second exhaust port 213 is provided with an air filtering membrane 25, i.e. after the gas in the first cavity 33 enters the exhaust passage, the gas passes through the air filtering membrane 25 and then leaves the injector through the second exhaust port 213.

The air filtering membrane 25 is used for preventing external air from entering the exhaust channel 24 through the second air outlet 213 and preventing liquid from leaking, and the principle is that a small amount of liquid enters the exhaust channel 24 through the first air outlet and contacts the air filtering membrane 25 in the extraction process, a liquid film cannot be formed on the inner surface of the air filtering membrane 25 due to the fact that the liquid cannot pass through the air filtering membrane 25, and external air cannot enter the exhaust channel 24 through the air filtering membrane 25 due to the blocking of the liquid film and then enter the first cavity 33.

Specifically, referring to fig. 2, the needle holder 2 includes a first holder 21, and in the axial direction X, the first connection end 211 is provided at a radial end face 214 of the first holder 21, the radial end face 214 is provided toward the bobbin 1, and the first holder 21 includes an outer tube 215 and an inner tube 216. In the radial direction Y, the outer tube 215 and the inner tube 216 form an annular cavity (not shown), a part of which constitutes the exhaust passage 24, and the inner tube 216 is fitted over the needle body 31.

Referring to fig. 5, the second exhaust port 213 is provided at the radial end surface 214 and around the first connection end 211.

With continued reference to fig. 2, the needle holder 2 comprises a second holder 22 and a sleeve 23, and the exhaust channel 24 comprises a first exhaust section 241 and a second exhaust section 242 arranged along the axial direction X.

The second fixing seat 22 has a first portion 221 and a second portion 222, an inner diameter E of the first portion 221 is larger than an inner diameter F of the second portion 222, and a connection end surface 223 is formed at a connection position of the first portion 221 and the second portion 222.

Along the axial direction X, the sleeve 23 and the second fixing seat 22 are inserted into the annular cavity, and the sleeve 23 and the second fixing seat 22 are respectively abutted against the air filtering membrane 25 so as to fix the air filtering membrane 25.

Along the radial direction Y, the sleeve 23 and the inner wall 2210 of the first portion 221 are arranged at intervals to form a first exhaust section 241, the inner wall 2220 of the second portion 222 and the needle body 31 are arranged at intervals to form a second exhaust section 242, the first exhaust section 241 is communicated with the second exhaust port 213, and the sleeve 23 is sleeved on the inner tube 216.

Along the axial direction X, one end of the sleeve 23 abuts against the air filtration membrane 25, and the other end abuts against the connection end face 223;

the sleeve 23 is provided with a third exhaust port 231, and the first exhaust section 241 and the second exhaust section 242 are communicated through the third exhaust port 231. The first exhaust port is in communication with the second exhaust section 242.

In some possible embodiments, the injection needle 3 is an interference fit with the needle holder 2, or the needle holder 2 is injection molded over the injection needle 3.

While the utility model has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the utility model with reference to specific embodiments, and it is not intended to limit the practice of the utility model to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present utility model.

Claims (9)

1. An injector is characterized by comprising a bobbin, an injection needle and a needle fixing seat;

one end of the bobbin is provided with a connecting part, the connecting part is positioned in the center of the end face of the bobbin, and the end face of the bobbin is round;

the capacity of the bobbin is 20-50 milliliters;

the injection needle is provided with a needle body and a needle head, the needle body is fixed on the needle fixing seat, and the needle head is used for puncturing;

the needle body is internally provided with a first cavity which is communicated with the bobbin and is used for extracting or injecting liquid;

the needle head is in a solid cone shape, the needle head is close to the needle head along the length direction of the needle body, the needle body is provided with a through hole, and the through hole is used for allowing liquid to enter or leave the first cavity;

the needle fixing seat is provided with a first connecting end which is connected with the connecting part;

the projection of the needle head on the end face of the bobbin is positioned at the center of the end face of the bobbin.

2. The syringe of claim 1, wherein the number of said through holes is two, and two of said through holes are disposed opposite to each other in the radial direction of said needle body.

3. The syringe of claim 1 or 2, wherein the connection comprises a first axially extending annular projection, the inner wall of the first annular projection being provided with an internal thread, the first connection end being a second axially extending annular projection, the second annular projection being provided with an external thread, the internal thread being threadedly engaged with the external thread to secure the first connection end and the first annular projection.

4. A syringe according to claim 3, wherein the connecting portion includes a second connecting end, the first annular projection encircling the second connecting end, the second connecting end having a decreasing outer diameter in a direction axially away from the barrel;

a second cavity is formed in the second connecting end, one end of the second cavity is communicated with the bobbin, and the other end of the second cavity is communicated with the first cavity;

along the axial orientation the direction of bobbin, the internal diameter of first link increases gradually, the inner wall of first link laminating in the outer wall of second link.

5. The syringe of any one of claims 1, 2, 4 wherein the needle holder is provided with a vent passage;

the needle body is provided with a first exhaust port;

the exhaust channel is communicated with the first cavity through the first exhaust port and is used for exhausting gas in the first cavity.

6. The syringe of claim 5 wherein said needle holder has a second vent port axially at an end thereof adjacent said connecting portion;

the second exhaust port is communicated with the exhaust channel and is used for exhausting gas out of the needle fixing seat;

the second exhaust port is provided with an air filtering membrane, and the air filtering membrane is used for preventing external air from entering the exhaust channel through the second exhaust port and preventing liquid from leaking.

7. The syringe of claim 6 wherein the needle holder comprises a first holder;

the first connecting end is arranged on the radial end face of the first fixing seat along the axial direction, and the radial end face faces the bobbin;

the first fixing seat comprises an outer pipe and an inner pipe, and the outer pipe surrounds the inner pipe;

the outer tube and the inner tube form an annular cavity along the radial direction, a part of the annular cavity forms the exhaust channel, and the inner tube is sleeved on the needle body;

the second exhaust port is arranged on the radial end face and surrounds the first connecting end.

8. The syringe of claim 7 wherein the needle holder comprises a second holder and a sleeve, the vent passage comprising axially-distributed first and second vent segments;

the second fixing seat is provided with a first part and a second part, and the inner diameter of the first part is larger than that of the second part;

the joint of the first part and the second part is a connecting end face;

the sleeve and the second fixing seat are inserted into the annular cavity along the axial direction and are abutted against the air filtering membrane;

the sleeve and the inner wall of the first part are arranged at intervals along the radial direction to form the first exhaust section, the inner wall of the second part and the needle body are arranged at intervals to form the second exhaust section, the sleeve is sleeved on the inner pipe, and the first exhaust section is communicated with the second exhaust port;

one end of the sleeve is abutted against the air filtering membrane along the axial direction, and the other end of the sleeve is abutted against the connecting end face;

the sleeve is provided with a third exhaust port, and the first exhaust section and the second exhaust section are communicated through the third exhaust port;

the first exhaust port is communicated with the second exhaust section.

9. The syringe of claim 8 wherein the needle is an interference fit with the inner tube; or (b)

The needle fixing seat is injection molded on the needle body.