CN206391310U - Filter injection needle - Google Patents

Abstract

The utility model provides a filter injection needle, including a steel needle, an upper needle seat, a lower needle seat, a one-way valve, a sealing pad and a filter membrane. The rear end of the upper needle seat is provided with a lower needle seat cavity and a one-way valve cavity. The cavity includes a frustum-shaped inner wall and a cylindrical inner wall. The small end of the frustum-shaped inner wall is provided with an annular groove. The center of the annular groove communicates with the steel needle installation hole. , the inner wall of the truncated cone is provided with a groove connected with the annular groove, the bottom of the annular groove is vertically provided with a triangular plate, the front end of the lower needle seat is provided with a connecting part, the center of the connecting part is provided with a valve core, and the filter membrane is set on the valve. The back end of the core, the one-way valve cylinder is sleeved on the valve core, the gasket is set on the front end of the one-way valve cylinder at the end of the valve core, and the connecting part is inserted into the lower needle seat cavity and passed between the lower needle seat cavity. surplus cooperation. The filtering and injection process of the filtering injection needle of the utility model is carried out automatically, without changing the needle, and avoiding the possibility of bacteria and virus contamination.

Description

filter injection needle

technical field

The utility model belongs to the field of medical equipment, in particular to a filter injection needle.

Background technique

As we all know, most of the injections currently used clinically are packaged in glass bottles. When the needle of the syringe is used to pierce the rubber stopper or cut the glass bottle with a grinding wheel to extract the medicinal solution, the bottle stopper chips or glass powder will enter the injection solution. Traditional syringes do not have a filter function. When liquid medicine is drawn, these impurities will be drawn into the syringe and injected directly into the patient, thereby inducing diseases such as venous inflammation.

Chinese utility model patent application CN102600535A discloses an injection needle with a precision filter, including a needle tube and a needle seat with an inner through hole, and the inner through hole of the needle seat includes an upper part with a smaller aperture, a lower part with a larger aperture and It has a middle part with a structure that gradually converges upwards to reduce the aperture, one end of the needle tube is placed on the upper part of the inner through hole, and a filter is arranged in the inner through hole of the needle holder. Since the liquid inlet channel and the liquid outlet channel of the injection needle are the same channel, the injection needle needs to be replaced again after filtration, but there is a risk of contamination by bacteria or viruses during the replacement process of the filter needle and the injection needle, and the clinical operation is also inconvenient .

Utility model content

The purpose of the utility model is to provide a filter injection needle with simple structure, convenient operation, safety and reliability, which does not need to be replaced during injection and avoids the possibility of bacteria and virus contamination.

The technical scheme of the utility model is: filtering the injection needle, including steel needle, upper needle seat, lower needle seat, one-way valve, sealing gasket and filter membrane, the steel needle is installed on the front end of the upper needle seat, and the rear end of the lower needle seat Connected to the cone head of the syringe, the rear end of the upper needle seat is provided with a lower needle seat cavity and a one-way valve cavity, the one-way valve cavity includes a frustum-shaped inner wall and a cylindrical inner wall, and the small end surface of the frustum-shaped inner wall An annular groove is provided, and the center of the annular groove communicates with the steel needle installation hole. The grooves are connected, and the bottom of the annular groove is vertically provided with an isosceles triangular triangular plate. The two ends of the bottom edge of the triangular plate are respectively connected with the bottom of the annular groove. The front end is provided with a cylindrical connecting part, and the center of the connecting part is provided with a cylindrical valve core. The rear end of the valve core is connected with the front end of the conical cavity. Valve cone, the small end of the one-way valve cone is connected to the front end of the one-way valve cylinder, the filter membrane is ring-shaped, the inner diameter of the filter membrane is equal to the outer diameter of the valve core, and the outer diameter of the filter membrane is equal to The inner diameter of the connecting part, the filter membrane is sleeved on the rear end of the valve core, the one-way valve cylinder is sleeved on the valve core, the side surface of the one-way valve cone is matched with the inner side wall of the one-way valve cavity, and the The gasket is arranged at the front end of the one-way valve cylinder at the end of the valve core, the top angle of the triangular plate is in contact with the front surface of the gasket, and the rear surface of the gasket is connected with the front end of the one-way valve cylinder. The connecting part is inserted into the inner of the lower needle seat cavity and has an interference fit with the lower needle seat cavity.

A plurality of grooves are evenly distributed on the circumference of the frustum-shaped inner wall.

Four grooves are evenly distributed on the inner wall of the frustum of a cone, the triangular plate is parallel to the two opposite grooves, and the length of the bottom side of the triangular plate is equal to the outer diameter of the annular groove.

The width of the groove is greater than the thickness of the triangular plate.

The inner diameter of the cylindrical inner wall is smaller than the inner diameter of the lower needle seat cavity.

The rear end of the spool is provided with a cylindrical spool seat, the outer diameter of the spool seat is greater than the outer diameter of the spool, the inner diameter of the spool seat is equal to the inner diameter of the spool, and the rear end of the spool seat is in contact with the taper head. The front end of the cavity is connected.

The rear end circumference of the valve core seat is evenly distributed with a plurality of connecting corners, the end of one right-angled side of the connecting corner is connected with the rear end of the valve core seat, and the end of the other right-angled side of the connecting corner is connected with the front end of the cone cavity. The inner walls are connected.

A plurality of annular protrusions are provided on the inner side wall of the lower needle seat cavity.

The one-way valve also includes a one-way valve annular surface, the inner circle of the one-way valve annular surface is vertically connected with the side wall of the one-way valve cylinder, and the outer circle of the one-way valve annular surface is connected with the lower end of the one-way valve cone.

The rear end of the cone of the one-way valve is provided with a cylindrical side wall matching with the cylindrical inner wall.

The utility model has the advantages and positive effects: the filtering and injection process of filtering the injection needle is carried out automatically, the liquid medicine is only filtered when drawing the medicine, and no filtering is required during injection, and the syringe does not need to replace the needle, avoiding the possibility of bacteria and virus contamination sex. The filter injection needle of the utility model has the advantages of simple overall structure, convenient operation, safety and reliability, low cost, disposable use, effectively avoiding cross-infection, and the like.

Description of drawings

Fig. 1 is an exploded view of the filter injection needle of the present invention

Fig. 2 is a side view of the upper needle holder of the utility model

Fig. 3 is a top view of the upper needle seat of the utility model

Fig. 4 is a schematic diagram of the three-dimensional structure of the upper needle holder of the utility model

Fig. 5 is a side view of the lower needle seat of the utility model

Figure 6 is a top view of the lower needle holder of the utility model

Fig. 7 is a structural schematic diagram of the utility model check valve

Fig. 8 is a schematic diagram of the structure of the utility model in the liquid inlet state

Fig. 9 is a structural schematic diagram of the liquid outlet state of the utility model

In the picture:

1. Steel needle 2. Upper needle seat 3. Gasket 4. One-way valve 5. Filter membrane

6. Lower needle seat 21, triangular plate 22, groove 23, steel needle installation hole 24, one-way valve cavity

25. Lower needle seat cavity 41. One-way valve cylinder 42. One-way valve cone 43. One-way valve annular surface 61. Connecting part

62, spool 63, spool seat 64, connecting corner 65, taper cavity 66, liquid outlet

241, frustum-shaped inner wall 242, cylindrical inner wall

detailed description

As shown in Figure 1, Figure 8, and Figure 9, the filter injection needle includes a steel needle 1, an upper needle seat 2, a lower needle seat 6, a one-way valve 4, a sealing gasket 3 and a filter membrane 5, and the steel needle 1 is installed on the upper The front end of the needle seat 2 and the rear end of the lower needle seat 6 are connected to the cone of the syringe. As shown in Fig. 2, Fig. 3 and Fig. 4, a lower needle seat cavity 25 and a one-way valve cavity 24 are provided at the rear end of the upper needle seat 2, and the one-way valve cavity 24 includes a frustum-shaped inner wall 241 and a cylindrical inner wall 242 , the small end face of the truncated conical inner wall 241 is provided with an annular groove, the center of the annular groove communicates with the steel needle mounting hole 23, the large end of the truncated conical inner wall 241 is connected with the cylindrical inner wall 242, and the inner truncated circular groove Wall 242 is provided with groove 22, and one end of groove 22 links to each other with annular groove, and the bottom of annular groove is vertically provided with isosceles triangle triangular plate 21, and the two ends of triangular plate 21 bottom edges are connected with annular groove bottom respectively, As shown in Figure 5 and Figure 6, the rear end of the lower needle base 6 is provided with a conical cavity 65, the front end of the lower needle base 6 is provided with a cylindrical connecting part 61, and the center of the connecting part 61 is provided with a cylindrical The spool 62, the rear end of the spool 62 is connected to the front end of the cone chamber 65, as shown in Figure 7, the check valve 4 includes a check valve cylinder 41 and a check valve cone 42, the check valve cone 42 The small end is connected with the front end of the one-way valve cylinder 41. The filter membrane 5 is annular, the inner diameter of the filter membrane 5 is equal to the outer diameter of the valve core 62, the outer diameter of the filter membrane 5 is equal to the inner diameter of the connecting part 61, and the filter membrane 5 is sleeved on the rear end of the valve core 62, one-way The valve cylinder body 41 is sleeved on the valve core 62, the side surface of the one-way valve cone 42 is matched with the conical inner side wall 241 of the one-way valve chamber 24, and the gasket 3 is arranged on the end of the valve core 62 on the one-way valve cylinder The front end of the body 41, the top angle of the triangular plate 21 is in contact with the front surface of the gasket 3, the rear surface of the gasket 3 is in contact with the front end surface of the one-way valve cylinder 41, and the connecting part 61 is inserted into the interior of the lower needle seat cavity 25 and is connected to the lower needle seat cavity 25. Interference fit between the needle seat cavities 25 .

As shown in FIG. 3 and FIG. 4 , a plurality of grooves 22 may be evenly distributed around the circumference of the frustum-shaped inner wall 241 . Preferably, four grooves 22 are evenly distributed on the circumference of the frustum-shaped inner wall 241 , the triangular plate 21 is parallel to the two opposite grooves 22 , and the length of the bottom side of the triangular plate 21 is equal to the outer diameter of the annular groove. That is, the triangular plate 21 is arranged in the middle of two relative grooves 22, and the grooves 22 are symmetrically arranged on both sides of the triangular plate 21, so that the connection between the triangular plate 21 and the bottom of the annular groove is firm, and the triangular plate 21 is not easy to tilt, and the medicine When the liquid flows out, the pressure and flow rate are relatively stable. Preferably, the width of the groove 22 is greater than the thickness of the triangular plate 21 . In this way, the medicinal liquid can flow into the steel needle installation hole 23 through the grooves 22 on both sides of the triangular plate 21 . The inner diameter of the cylindrical inner wall 242 is smaller than the inner diameter of the lower needle seat cavity 25 .

The side wall at the rear end of the spool 62 can be directly connected to the inner side wall of the cone chamber 65, and a gap can be provided for passing the liquid medicine. As shown in Fig. 5 and Fig. 6, the rear end of the spool 62 can also be provided with a cylindrical spool seat 63, the outer diameter of the spool seat 63 is greater than the outer diameter of the spool 62, and the inner diameter of the spool seat 63 is equal to The inner diameter of the spool 63 and the rear end of the spool seat 63 are connected to the front end of the cone cavity 65 . The setting of the spool seat 63 makes the spool 62 firmer and prevents the spool 62 from being damaged due to excessive injection pressure. The rear end circumference of spool seat 62 is evenly provided with a plurality of connecting corners 64, and the end of a right-angled side of connecting corner 64 is connected with spool seat 62 rear ends, and the end of another right-angled side of connecting corner 64 is connected with the taper. The inner wall of the front end of the head cavity 65 is connected. Medical fluid can flow through the gap between the connecting corners 64 . The connecting corner 62 firmly connects the valve core seat 63 and the inner wall of the conical cavity 65 to avoid damage to the valve core 62 caused by excessive injection pressure.

A plurality of annular protrusions are provided on the inner side wall of the lower needle seat cavity 25 . The annular protrusion can improve the connection strength and sealing effect of the connection between the inner side wall of the lower needle seat cavity 25 and the outer side wall of the connecting portion 61 .

As shown in Figure 7, the one-way valve 4 can also include a one-way valve annular surface 43, the inner circle of the one-way valve annular surface 43 is vertically connected with the side wall of the one-way valve cylinder 41, and the outer circle of the one-way valve annular surface 43 It is connected with the lower end of the one-way valve cone 42 . In this way, the sealing effect between the side wall of the one-way valve cone 42 and the inner side wall 241 of the cone shape can be improved. Further, the rear end of the one-way valve cone 42 may be provided with a cylindrical side wall matching with the cylindrical inner wall 241 .

The working process of this example:

When inhaling the liquid medicine, as shown in Figure 8, the liquid medicine enters the steel needle installation hole 23 at the front end of the upper needle seat 2 through the steel needle 1, and enters the one-way valve chamber through the groove 22 on the inner side wall 241 of the frustum of a cone. 24. Under the action of suction, the gasket 3 seals the liquid outlet of the lower needle seat 6, and at the same time, the one-way valve cone 42 is deformed, and the gap between the one-way valve cone 42 and the frustum-shaped inner wall 241 is opened , the liquid medicine can only enter the rear end of the one-way valve cavity 24 through the gap between the cylindrical inner wall 242 and the large end of the one-way valve cone 42, and then pass through the ring-shaped filter membrane 5 under the action of suction from the connection corner The gap between 64 enters in the cone cavity 65 of lower needle seat 6.

When injecting liquid medicine, as shown in Figure 9, under the action of the thrust, the one-way valve cone 42 is deformed, and the gap between the side surface of the one-way valve cone 42 and the inner wall 241 of the conical shape is sealed, and through the connecting corner The gap between 64 returns to the liquid medicine between the connecting part 61 and the spool 62, which cannot flow out through the liquid inlet channel between the side surface of the one-way valve cone 42 and the inner wall 241 of the conical shape, but flows from the center of the spool 62. The liquid outlet hole 66 flows out and passes through the gasket 3. Under the action of pressure, the gap between the gasket 3 and the front end of the valve core 62 opens, and the liquid medicine enters the one-way valve cavity 24, and then enters through the one-way valve cavity 24. into the needle 1.

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

Claims (10)

1. injection needle is filtered, including draw point, upper needle stand, lower needle stand, check valve, sealing gasket and filter membrane, draw point is arranged on upper The front end of needle stand, the rear end of lower needle stand is connected on the conehead of syringe, it is characterised in that：The upper needle stand rear end is provided with lower pin Seat chamber and unidirectional valve pocket, unidirectional valve pocket include truncated cone-shaped madial wall and inner cylindrical sidewall, the small end end face of truncated cone-shaped madial wall Provided with annular groove, center and the draw point mounting hole of annular groove are connected, big end and the cylinder inner side of truncated cone-shaped madial wall Wall is connected, and truncated cone-shaped madial wall is provided with groove, and one end of groove is connected with annular groove, and annular groove bottom is vertically provided with The set square of isosceles triangle, the two ends on set square base are connected with annular groove bottom respectively, the rear end of the lower needle stand Provided with conehead chamber, the front end of lower needle stand is provided with columnar connecting portion, and the center of connecting portion is provided with columnar valve element, valve element Rear end is connected with the front end of conehead chamber, and the check valve includes check valve cylinder and check valve frustum, the small end of check valve frustum It is connected with the front end of check valve cylinder, the filter membrane is annular, the interior circular diameter of filter membrane is equal to the external diameter of valve element, filtering The outside diameter of film is equal to the internal diameter of connecting portion, and filter membrane is set in the rear end of valve element, and check valve cylinder is set on valve element, single It is engaged to the side surface of valve cone platform with unidirectional valve pocket truncated cone-shaped madial wall, the sealing gasket is arranged on the end check valve of valve element The front end of cylinder, the drift angle of the set square is in contact with the preceding surface of sealing gasket, after sealing gasket before surface and check valve cylinder End end face is in contact, the lower needle stand intracavitary portion of connecting portion insertion and the interference fit between lower needle stand chamber.

2. filtering injection needle according to claim 1, it is characterised in that：Circumference uniform distribution is provided with more on truncated cone-shaped madial wall Individual groove.

3. filtering injection needle according to claim 2, it is characterised in that：Circumference uniform distribution is provided with 4 on truncated cone-shaped madial wall Individual groove, the set square is parallel with two relative grooves, and the base length of side of the set square is equal to the outer of annular groove Footpath.

4. filtering injection needle according to claim 3, it is characterised in that：The width of the groove is more than the thickness of set square Degree.

5. the filtering injection needle according to claim 1-4 any one, it is characterised in that：The inner cylindrical sidewall Internal diameter is less than the internal diameter of lower needle stand chamber.

6. filtering injection needle according to claim 5, it is characterised in that：The rear end of the valve element is provided with columnar valve Core print seat, the external diameter of valve core case is more than the external diameter of valve element, and the internal diameter of valve core case is equal to the internal diameter of valve element, the rear end of valve core case and conehead The front end of chamber is connected.

7. filtering injection needle according to claim 6, it is characterised in that：The back end circumference of the valve core case is laid with Multiple connecting corners, the end of a right-angle side of connecting corner is connected with valve element base rear end, and another of connecting corner is straight The end of the arm of angle is connected with conehead chamber leading inside wall.

8. filtering injection needle according to claim 7, it is characterised in that：The madial wall of the lower needle stand chamber is provided with more Individual annular projection.

9. filtering injection needle according to claim 8, it is characterised in that：The check valve also includes check valve annular Face, inner circle and the check valve cylinder lateral wall of check valve ring surface are vertically connected, the cylindrical and check valve frustum of check valve ring surface Lower end is connected.

10. filtering injection needle according to claim 9, it is characterised in that：The check valve frustum rear end is provided with and circle The cylindrical side wall that cylindricality madial wall is engaged.