CN106580698A - Air filtering needle - Google Patents

Abstract

The invention provides an air filter needle, which includes a steel needle, an upper needle seat, a lower needle seat and a filter membrane. The front side wall of the steel needle is provided with a ventilation hole, and the upper needle seat is sequentially provided with an upper vertebral body and a first cylinder from top to bottom. Body, second cylinder and third cylinder, the inner diameter of the small end of the upper vertebral body is equal to the outer diameter of the steel needle, and a plurality of elongated liquid inlet holes are evenly distributed on the upper circumference of the side wall of the upper vertebral body, the third cylinder The outer diameter of the second cylinder is smaller than the outer diameter of the second cylinder. The lower needle seat is provided with a connecting cylinder, a square shell and a cone cavity from top to bottom, and a cylindrical steel needle cavity is provided inside the connecting cylinder. The steel needle Inserted into the steel needle cavity, a cylindrical filter hole is vertically inwardly arranged on one side wall of the square shell, the upper side wall of the filter hole is connected with the side wall of the steel needle cavity, and the lower side wall of the filter hole is connected with the steel needle cavity The other side is connected to the side wall, the filter hole is connected to the steel needle cavity, a filter membrane is arranged in the filter hole, and the third cylinder is in interference fit with the connecting cylinder. The air filter needle of the present invention has a simple structure and is easy and convenient to suck out the liquid medicine completely.

Description

air filter needle

technical field

The invention belongs to the field of medical equipment, and in particular relates to an air filter needle.

Background technique

Infusion is a widely used treatment method. Before infusion, it is usually necessary to prepare powder or liquid medicine with liquid medicine or a solution to be infused into a liquid medicine, and then add the liquid medicine to the solution to be infused . When dosing and drawing medicine, it is necessary to maintain the air pressure balance inside and outside the bottle, so that the operation of dosing and drawing medicine can be done easily. During the preparation of the liquid medicine, a sterile air filter needle is required to maintain the air pressure balance inside and outside the bottle, and to prevent dust particles and pathogens in the air from entering the solution to be injected.

Application number: 201310612571.6 discloses a low-damping drug-dosing needle with end-face exhaust, including a hollow needle, a needle sleeve, a needle holder and an air filter, and an air vent is provided on the side of the needle guard tube of the needle sleeve; The bottom of the docking hole of the fixed seat is provided with an end surface air outlet connected to the outside world, and an air filter is provided at the bottom of the docking hole. Hold the air filter membrane, and the air vent is connected with the air outlet on the end face. Both the needle sleeve and the needle fixing seat are structures that are convenient for axial core pulling, the pressing mold structure is complex, the forming and pressing efficiency is low, and the overall cost of the product is high, which is not conducive to industrialization.

Application number: 201320756445.3 discloses a low-damping medicated needle with end-face exhaust, including a hollow needle, a needle sleeve, a needle holder and an air filter membrane, and an air vent is provided on the side of the needle guard tube of the needle sleeve; The bottom of the docking hole of the fixed seat is provided with an end surface air outlet connected to the outside world, an air filter membrane is provided at the bottom of the docking hole, the upper end of the needle sleeve is set in the docking hole of the lower end of the hollow needle, and the lower end surface of the connecting seat tube is pressed. Hold the air filter membrane, and the exhaust hole is connected with the air outlet on the end face.

When the air filter needle in the prior art sucks out the liquid medicine, the air hole at the front end of the sleeve needs to be higher than the highest point of the rubber stopper, so that the gas can enter the bottle smoothly, which will result in a part lower than the highest part of the rubber stopper. The liquid medicine cannot be sucked out, resulting in waste, and the position of the steel needle needs to be constantly adjusted during the process of sucking out the medicine liquid. The front end of the steel needle is lower than the liquid level, and it takes time and effort to use.

Contents of the invention

The purpose of the present invention is to provide an air filter needle with simple structure, which can completely suck out the medicinal liquid and is easy and convenient to use.

Technical scheme of the present invention is:

The air filter needle includes a steel needle, an upper needle seat, a lower needle seat and a filter membrane. There is a ventilation hole on the side wall of the front end of the steel needle. In the second cylinder and the third cylinder, the inner diameter of the small end of the upper vertebra is equal to the outer diameter of the steel needle, the large end of the upper vertebra is connected with the upper end of the first cylinder, and the upper circumference of the side wall of the upper vertebra is evenly equipped with multiple A long liquid inlet hole, the liquid inlet hole and the steel needle axis are on the same plane, the inner diameter of the third cylinder is equal to the inner diameter of the second cylinder, and the outer diameter of the third cylinder is smaller than the outer diameter of the second cylinder , the lower needle seat is provided with a connecting cylinder, a square shell and a conical head chamber in sequence from top to bottom, and a cylindrical steel needle chamber is arranged inside the connecting cylinder, and the inner diameter of the steel needle chamber is equal to the outer diameter of the steel needle , the steel needle is inserted into the steel needle cavity, a cylindrical filter hole is vertically inwardly arranged on one side wall of the square shell, the upper side wall of the filter hole is connected with the side wall of the steel needle cavity, and the lower side wall of the filter hole is connected with the side wall of the steel needle cavity. The other side of the steel needle cavity is connected to the side wall, the filter hole is connected to the steel needle cavity, and a filter membrane is arranged in the filter hole, and the third cylinder is inserted into the connection cylinder and has an interference fit with the connection cylinder.

When the air filter needle of the present invention is used, the upper vertebral body is inserted into the rubber plug, and the medicinal liquid enters the upper vertebral body through the liquid inlet hole, and then passes downward through the gap between the inner side wall of the first cylinder body and the outer side wall of the steel needle. , the gap between the inner wall of the second cylinder and the outer wall of the steel needle, the gap between the inner wall of the third cylinder and the outer wall of the needle cavity, and the gap between the square shell and the outer wall of the needle cavity enter the cone in the head cavity. At the same time, outside air enters the filter hole through the filter membrane, enters the steel needle upwards from the steel needle cavity, and finally is discharged through the vent hole on the front side wall of the steel needle.

Both the liquid inlet channel and the air channel of the present invention are large, the drug pumping pressure is small, and the operation is easy and convenient. At the same time, the medicine inlet hole of the present invention is located on the upper vertebral body. After the upper vertebral body is inserted into the rubber plug, the medicine inlet hole is located at the lowest part of the rubber plug, which can completely suck out the medicine liquid in the rubber plug. When in use, the front end of the steel needle does not need to be located below the liquid level, and the liquid level does not need to be adjusted during the process of sucking out the liquid medicine, so the use is easy and convenient.

The upper end of the steel needle cavity is higher than the upper end of the connecting cylinder.

The height of the third cylinder is smaller than that of the connecting cylinder.

The upper needle hub also includes a fourth cylindrical body, the lower end of the fourth cylindrical body is connected with the small end of the upper vertebral body, the inner diameter of the fourth cylindrical body is equal to the outer diameter of the steel needle, and the outer diameter of the fourth cylindrical body is equal to the upper The outer diameter of the small end of the vertebral body.

The inner wall of the fourth cylinder is set close to the outer wall of the steel needle, so that the upper vertebral body can be easily inserted into the rubber plug.

The outer diameter of the first cylinder is smaller than the outer diameter of the second cylinder, and a plurality of support ribs are evenly distributed around the lower end of the outer wall of the first cylinder, and the lower ends of the support ribs are vertically connected with the upper end surface of the second cylinder, supporting The inner side of the rib is vertically connected with the outer wall of the first cylinder, and the height of the supporting rib is smaller than that of the first cylinder.

The supporting ribs can prevent the upper needle hub from being fully inserted into the rubber plug. When the air filter needle is thicker in the rubber plug, only the part of the drug inlet hole on the upper vertebral body needs to leak out of the inner side of the rubber plug.

A groove is provided on the inner side wall of the filter hole, the inner diameter of the groove is larger than the inner diameter of the filter hole, and the filter membrane is ultrasonically welded inside the groove.

The filter hole is also provided with a gland, the gland includes a circular cover and a cylindrical inner plug, the diameter of the cover is larger than the diameter of the filter hole, the inner plug of the gland is inserted into the filter hole and The filter hole is interference fit, and the cover is provided with a plurality of through holes.

The advantages and positive effects of the invention are: simple structure, convenient use, and avoiding the waste of medicinal liquid.

Description of drawings

Fig. 1 is a structural representation of the air filter needle of the present invention

Fig. 2 is a sectional view of the air filter needle of the present invention

Fig. 3 is an exploded view of the air filter needle of the present invention

Fig. 4 is a schematic diagram of the structure of the needle seat on the air filter needle of the present invention

Fig. 5 is a schematic diagram of the structure of the lower needle seat of the air filter needle of the present invention

In the picture:

1. Steel needle 2. Upper needle seat 3. Lower needle seat 4. Filter membrane 5. Filter membrane gland

11. Ventilation hole 21, liquid inlet hole 22, upper vertebral body 23, first cylinder body 24, second cylinder body

25. The third cylinder 26. The fourth cylinder 27. Support rib 31. Connecting cylinder 32. Needle cavity

33. Square shell 34. Cone cavity 35. Filter hole 36. Upper side wall of filter hole 37. Lower side wall of filter hole

detailed description

As shown in Figure 1, Figure 2, and Figure 3, the air filter needle includes a steel needle 1, an upper needle seat 2, a lower needle seat 3 and a filter membrane 4, and the front side wall of the steel needle 1 is provided with a ventilation hole 11, as shown in the figure 4, the upper needle holder 2 is provided with an upper vertebral body 22, a first cylindrical body 23, a second cylindrical body 24 and a third cylindrical body 25 from top to bottom, and the inner diameter of the small end of the upper vertebral body 22 is equal to that of the steel needle 1. Outer diameter, the large end of the upper vertebral body 22 is connected with the upper end of the first cylindrical body 23, and the upper circumference of the side wall of the upper vertebral body 22 is evenly equipped with a plurality of elongated liquid inlet holes 21, and the liquid inlet holes 21 are connected with steel The axis of needle 1 is on the same plane, the inner diameter of the third cylindrical body 25 is equal to the inner diameter of the second cylindrical body 24, and the outer diameter of the third cylindrical body 25 is smaller than the outer diameter of the second cylindrical body 24, as shown in Figure 5, the lower needle The seat 3 is provided with a connecting cylinder 31, a square housing 33 and a conical cavity 34 from top to bottom, and a cylindrical steel needle cavity 32 is arranged inside the connecting cylinder 31, and the inner diameter of the steel needle cavity 32 is equal to the steel needle 1 The outer diameter of the steel needle 1 is inserted into the steel needle cavity 32, and a cylindrical filter hole 35 is vertically inwardly arranged on a side wall of the square housing 33, and the upper side wall of the filter hole 35 is connected to the side wall of the steel needle cavity 32. The lower side wall of the filter hole 35 is connected with the other side wall of the steel needle chamber 32, the filter hole 35 is connected with the steel needle chamber 32, the filter hole 35 is provided with a filter membrane 4, and the third cylinder 25 is inserted into the connecting cylinder The inside of the body 31 is in interference fit with the connecting cylinder 31 .

Further, the upper end of the steel needle chamber 32 is higher than the upper end of the connecting cylinder 31 . The height of the third cylinder 25 is smaller than that of the connecting cylinder 31 . The upper needle hub 2 can further include a fourth cylindrical body 26, the lower end of the fourth cylindrical body 26 is connected with the small end of the upper vertebral body 22, the inner diameter of the fourth cylindrical body 26 is equal to the outer diameter of the steel needle 1, and the fourth cylindrical body 26 The outer diameter of body 26 is equal to the outer diameter of upper vertebral body 22 small ends. The inner side wall of the fourth cylindrical body 26 is arranged close to the outer side wall of the steel needle 1, so that the upper vertebral body 22 can be easily inserted into the rubber plug.

The outer diameter of the first cylindrical body 23 is less than the outer diameter of the second cylindrical body 24, and the circumference of the lower end of the outer wall of the first cylindrical body 23 is evenly provided with a plurality of supporting ribs 27, and the lower end of the supporting ribs 27 is connected with the upper end surface of the second cylindrical body 24. Vertically connected, the inner side of the support rib 27 is vertically connected with the outer wall of the first cylinder 23 , and the height of the support rib 27 is smaller than the height of the first cylinder 23 .

The supporting ribs 27 can prevent the upper needle hub 2 from being fully inserted into the rubber stopper. In the case of a thicker rubber plug, only part of the drug inlet hole 22 on the upper vertebral body 21 needs to leak out of the inner side of the rubber plug.

A groove is provided on the inner side wall of the filter hole 35 , the inner diameter of the groove is larger than the inner diameter of the filter hole 35 , and the filter membrane 4 is ultrasonically welded inside the groove. Also be provided with gland 5 in filter hole 35, gland 5 comprises circular cover body and cylindrical inner plug, the diameter of cover body is greater than the diameter of filter hole 35, and the inner plug of gland 5 inserts filter hole 35 In the center and interference fit with the filter hole 35, the cover is provided with a plurality of through holes.

When the air filter needle of the present invention is used, the upper vertebral body 22 is inserted into the rubber plug, and the medicinal liquid enters the upper vertebral body 22 through the liquid inlet hole 21, and then passes through the inner side wall of the first cylinder body 23 and the outer side of the steel needle 1 in turn. The gap between the walls, the gap between the inner side wall of the second cylinder 24 and the outer side wall of the steel needle 1, the gap between the inner side wall of the third cylinder 25 and the outer side wall of the steel needle chamber 32, and the square housing 33 and the steel needle The gap between the outer side walls of cavity 32 enters into cone cavity 34 . At the same time, outside air enters the filter hole 35 through the filter membrane 4, enters the steel needle 1 from the inside of the steel needle cavity 32, and finally is discharged through the vent hole 11 on the front side wall of the steel needle 1. Both the liquid inlet channel and the air channel of the present invention are large, the drug pumping pressure is small, and the operation is easy and convenient. At the same time, the medicine inlet hole 21 of the present invention is located on the upper vertebral body 22. After the upper vertebral body 22 is inserted into the rubber plug, the medicine inlet hole 21 is located at the lowest part of the rubber plug, which can completely suck out the medicinal liquid in the rubber plug. When in use, the front end of the steel needle 1 does not need to be located below the liquid level, and the liquid level does not need to be adjusted during the process of sucking out the liquid medicine, so the use is easy and convenient.

An embodiment of the present invention has been described in detail above, but the content described is only a preferred embodiment of the present invention, and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (7)

1. air filtration pin, including draw point, upper needle stand, lower needle stand and filter membrane, draw point front end side wall are provided with passage, and which is special Levy and be：Upper needle stand is from top to bottom sequentially provided with vertebral body, the first cylinder, the second cylinder and the 3rd cylinder, in upper vertebral body small end Footpath is equal to the external diameter of draw point, and the big end of upper vertebral body is connected with the upper end of the first cylinder, and on the side wall of upper vertebral body, circumference uniform distribution sets There is the inlet opening of multiple strips, with draw point axis at grade, the internal diameter of the 3rd cylinder is equal to the second cylinder to inlet opening Internal diameter, the external diameter of the external diameter of the 3rd cylinder less than the second cylinder, the lower needle stand be from top to bottom sequentially provided with connector drum, side Shape housing and conehead chamber, are provided with columnar draw point chamber inside connector drum, the internal diameter in draw point chamber is equal to the external diameter of draw point, draw point Insertion draw point intracavity, it is perpendicularly inward on a side wall of square casing to be provided with columnar filtering holes, filtering holes upper side wall and steel Needle cavity side side wall is connected, and filtering holes lower wall is connected with draw point chamber opposite side side wall, and filtering holes are connected with draw point chamber, filters Filter membrane is provided with hole, with connector drum interference fit inside the 3rd cylinder insertion connector drum.

2. air filtration pin according to claim 1, it is characterised in that：The upper end in the draw point chamber is higher than connector drum Upper end.

3. air filtration pin according to claim 2, it is characterised in that：The height of the 3rd cylinder is less than connector drum Height.

4. air filtration pin according to claim 1, it is characterised in that：The upper needle stand also include the 4th cylinder, the 4th The lower end of cylinder is connected with the small end of upper vertebral body, and the internal diameter of the 4th cylinder is equal to the external diameter of draw point, external diameter of the 4th cylinder etc. In the external diameter of upper vertebral body small end.

5. air filtration pin according to claim 4, it is characterised in that：The external diameter of first cylinder is less than the second cylinder External diameter, the first cylinder lateral wall lower circumferential is laid with multiple brace rods, the upper end of the lower end of brace rod and the second cylinder End face is vertically connected, and the inner side of brace rod is vertically connected with the first cylinder lateral wall, and the height of brace rod is less than the first cylinder Highly.

6. the air filtration pin according to claim 1-5 any one, it is characterised in that：On the medial wall of the filtering holes Groove is provided with, the internal diameter of groove is more than the internal diameter of filtering holes, and the filter membrane is ultrasonically welded within inside grooves.

7. air filtration pin according to claim 6, it is characterised in that：Gland, the pressure are additionally provided with the filtering holes Lid includes the lid and columnar interior plug of circle, and the diameter with diameter greater than filtering holes of lid, the interior plug insertion of gland are filtered In hole and with filtering holes interference fit, lid is provided with multiple through holes.