CN215024051U - Syringe with a needle - Google Patents

Abstract

The utility model provides an injector, including cylinder and syringe needle, the syringe needle overcoat has the syringe needle helmet, the syringe needle comprises puncture tube and conical syringe needle seat, syringe needle seat outside is equipped with n coincidence in the stiffening rib of syringe needle seat axial cross-section, and n is more than or equal to 3's integer, one side that syringe needle seat axis was kept away from to the stiffening rib is equipped with the direction inclined plane, and the one end that the direction inclined plane is close to puncture tube is the upper end, and the one end that puncture tube was kept away from to the direction inclined plane is the lower extreme, and the upper end on n a direction inclined plane is located same diameter and is R1's virtual circumference, and the lower extreme on n a direction inclined plane is located same diameter and is R2's virtual circumference, the inboard of syringe needle helmet is equipped with first ring shape boss, and the internal diameter of first ring shape boss is R3, be equipped with n and stiffening rib matched with breach on the first ring shape boss, R1 < R3 < R2. The beneficial effects of the utility model are that owing to adopt above-mentioned technical scheme, the connection of the syringe needle of syringe and syringe needle helmet is stable, and it is convenient to separate.

Description

Syringe with a needle

Technical Field

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

Background

Syringes are commonly used devices in medical practice for the withdrawal or injection of gases or liquids. Syringes are generally composed of a barrel and a needle, and in order to prevent the needle from pricking or contaminating, a needle cap is usually provided on the needle. In the prior art, a needle comprises a puncture metal tube and a needle seat, the puncture metal tube is arranged on the needle seat, a needle protective cap and the needle seat are connected through interference fit, the needle is preassembled on a needle cylinder before packaging, the needle protective cap is preassembled on the needle seat, and finally sterilization is carried out.

Because the needle head protective cap and the needle head seat adopt an interference fit connection mode, due to the reasons of insufficient precision in processing and the like, the interference magnitude between the needle head protective cap and the needle head seat is often too large, so that the needle head protective cap is difficult to pull out from the needle head seat. In addition, excessive force can cause the needle to be pulled out of the barrel, exposing the connection between the barrel and the needle on the syringe to air, and creating a contamination risk.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a syringe, the connection between syringe needle and the syringe needle helmet is stable, and it is convenient to separate.

The technical scheme of the utility model is that:

the utility model provides an injector, includes cylinder and syringe needle, and the syringe needle overcoat has the syringe needle helmet, the syringe needle comprises puncture tube and conical syringe needle seat, syringe needle seat outside is equipped with n coincidence in the stiffening rib of syringe needle seat axial cross-section, and n is more than or equal to 3's integer, one side that syringe needle seat axis was kept away from to the stiffening rib is equipped with the direction inclined plane, and the one end that the direction inclined plane is close to the puncture tube is the upper end, and the one end that the puncture tube was kept away from to the direction inclined plane is the lower extreme, and the upper end on n a direction inclined plane is located same diameter for the virtual circumference of R1, and the lower extreme on n a direction inclined plane is located same diameter for the virtual circumference of R2, the inboard of syringe needle helmet is equipped with first ring shape boss, and the internal diameter of first ring shape boss is R3, be equipped with n and stiffening rib matched with breach on the first ring shape boss, R1 < R3 < R2.

And a second circular boss is arranged on one side of the first circular boss, which is far away from the opening end of the needle head protective cap, the inner diameter of the second circular boss is R4, and R4 is less than R1.

The novel syringe needle cap is characterized in that n convex edges parallel to the axis of the syringe needle cap are arranged on the inner wall of the syringe needle cap, the convex edges are arranged on one side of the notch, and the convex edges correspond to the notch one to one.

The outer wall of the needle head protective cap is provided with anti-skid grains.

The utility model has the advantages and positive effects that: due to the adoption of the technical scheme, the connection between the needle head of the syringe and the needle head protective cap is stable, and the separation is convenient.

Drawings

FIG. 1 is a schematic structural diagram of the present invention

FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1

FIG. 4 is a detail view at A of FIG. 3

FIG. 5 is a schematic view of the structure of the needle

FIG. 6 is a front view of the needle

FIG. 7 is a detail view at A of FIG. 6

FIG. 8 is a front view of the needle shield

FIG. 9 is an isometric view of the needle shield

FIG. 10 is a detail view at A of FIG. 9

FIG. 11 is a cross-sectional view taken at B-B in FIG. 8

In the figure:

1. needle 2, needle cap 11 and puncture tube

12. Needle seat 13, reinforcing rib 21, first circular ring boss

22. Second circular boss 23, convex rib 131 and guide inclined plane

211. Notch 1311, upper end 1312, and lower end

Detailed Description

As shown in fig. 1, 2 and 5, the utility model discloses:

a syringe comprises a syringe and a needle, a needle protective cap 2 is sleeved outside the needle 1, the needle 1 consists of a puncture tube 11 and a conical needle seat 12, n reinforcing ribs 13 coincident with the axial section of the needle seat 12 are arranged outside the needle seat 12, n is an integer more than or equal to 3,

as shown in fig. 6-7

One side of the reinforcing rib 13 far away from the axis of the needle seat 12 is provided with a guide inclined plane 131, one end of the guide inclined plane 131 close to the puncture tube 11 is an upper end 1311, and one end of the guide inclined plane 131 far away from the puncture tube is a lower end 1312.

As shown in figures 3, 4, 8 and 9,

the upper ends 1311 of the n guide inclined planes are located on the same virtual circumference with the diameter of R1, the lower ends 1312 of the n guide inclined planes are located on the same virtual circumference with the diameter of R2, a first circular-ring-shaped boss 21 is arranged on the inner side of the needle head protective cap 2, the inner diameter of the first circular-ring-shaped boss 21 is R3, n notches 211 matched with the reinforcing ribs 13 are formed in the first circular-ring-shaped boss 21, and R1 is larger than R3 and smaller than R2.

The number of the reinforcing ribs 13 is 4, and the 4 reinforcing ribs 13 are uniformly distributed along the circumferential direction of the needle seat 12. The center of a virtual circle where the upper end 1311 of the guide slope 131 and the center of a virtual circle where the lower end 1312 of the guide slope are both coincident with the axis of the needle base 12, and the planes of the two virtual circles are respectively perpendicular to the axis of the needle base 12.

One side of the reinforcing rib 13, which is far away from the axis of the needle head seat, is the outer side surface of the reinforcing rib, the outer side surface of the reinforcing rib is provided with a limiting boss of a right triangle, the guide inclined surface 131 is the hypotenuse of the right triangle, the right-angle side where the upper end 1311 of the guide inclined surface is positioned is parallel to the axis of the needle head seat, and the right-angle side where the lower end 1312 of the guide inclined surface is positioned is perpendicular to the axis of the needle head seat.

In the process that the needle cap 2 is sleeved on the needle 1, the upper end 1311 of the guide inclined plane passes through the first circular boss 21 without obstacle, the guide inclined plane 131 contacts with the inner side of the first circular boss 21 with the further downward movement of the needle cap 2, the guide inclined plane 131 and the first circular boss 21 slightly deform until the lower end 1312 of the guide inclined plane passes through the first circular boss 21, and due to the existence of the guide inclined plane 131, although R2 is larger than R3, the lower end 1312 of the guide inclined plane can easily pass through the first circular boss 21 by slight force application. However, in the reverse direction (the needle shield is pulled out of the needle base), the lower end 1312 of the guiding slope abuts against the first annular protrusion 21, and the needle shield 2 cannot be pulled out.

The first circular boss 21 is provided with a notch 211, and as long as the needle protection cap 2 rotates a certain angle relative to the needle base 12 to enable the reinforcing rib 13 to correspond to the notch 211, the reinforcing rib 13 can pass through the first circular boss 21 from the notch 211, so that the needle protection cap 2 can be pulled out from the needle base 12.

The side of the first circular boss 21 far away from the opening end of the needle cap 2 is provided with a second circular boss 22, the inner diameter of the second circular boss 22 is R4, and R4 is more than R1.

The effect of the second circular ring-shaped boss 22 is limited to the depth of the needle 1 inserted into the needle cap 2, and simultaneously, the reinforcing rib 13 is clamped between the first circular ring-shaped boss 21 and the second circular ring-shaped boss 22, so that the needle 1 and the needle cap 2 cannot move back and forth in the axial direction of the needle.

As shown in figures 10 and 11 of the drawings,

be equipped with n on the needle head helmet 2 inner wall and say that be on a parallel with the bead 23 of needle head helmet axis, bead 23 sets up in one side of breach 211, bead 23 and breach 211 one-to-one.

The significance of the ribs 23 is that the needle shield 2 is restrained when it is rotated relative to the needle 1, so that the ribs 13 are more easily aligned with the notches 211.

The outer wall of the needle head protective cap 2 is provided with anti-skid grains. The anti-slip threads make the needle shield easier to rotate relative to the needle base.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims (4)

1. The utility model provides a syringe, includes cylinder and syringe needle, and the syringe needle overcoat has the syringe needle helmet, the syringe needle comprises puncture tube and conical syringe needle seat, syringe needle seat outside is equipped with n and coincides in the stiffening rib of syringe needle seat axial cross-section, and n is more than or equal to 3's integer, its characterized in that: one side that the syringe needle seat axis was kept away from to the stiffening rib is equipped with the direction inclined plane, and the one end that the direction inclined plane is close to the puncture tube is the upper end, and the one end that the puncture tube was kept away from to the direction inclined plane is the lower extreme, and the upper end on n a direction inclined plane is located same diameter and is R1's virtual circumference, and the lower extreme on n a direction inclined plane is located same diameter and is R2's virtual circumference, the inboard of syringe needle helmet is equipped with first ring shape boss, and the internal diameter of first ring shape boss is R3, be equipped with n and stiffening rib matched with breach on the first ring shape boss, R1R 3R 2.

2. The syringe of claim 1, wherein: one side of the first circular ring-shaped boss, which is far away from the opening end of the needle head protective cap, is provided with a second circular ring-shaped boss, the inner diameter of the second circular ring-shaped boss is R4, and R4 is less than R1.

3. The syringe of claim 1, wherein: the novel syringe needle cap is characterized in that n convex edges parallel to the axis of the syringe needle cap are arranged on the inner wall of the syringe needle cap, the convex edges are arranged on one side of the notch, and the convex edges correspond to the notch one to one.

4. The syringe of claim 1, wherein: the outer wall of the needle head protective cap is provided with anti-skid grains.

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