CN215585086U

CN215585086U - Needle head limiting structure

Info

Publication number: CN215585086U
Application number: CN202120654071.9U
Authority: CN
Inventors: 江瑞洋
Original assignee: Hubei Kelaide Medical Instrument Co Ltd
Current assignee: Hubei Kelaide Medical Instrument Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-01-21
Anticipated expiration: 2031-03-31

Abstract

The utility model discloses a needle head limiting structure, and belongs to the technical field of syringes. Comprises a stop collar, a stop convex ring at the inner upper part of the syringe, an annular bulge at the inner lower part of the needle seat and a locking convex ring which is arranged on the tenon and matched with the annular bulge; the locking convex ring can upwards penetrate through the annular bulge and be locked, and the stop ring is of an annular structure; the limiting ring comprises an annular body and a plurality of hooks uniformly distributed on the annular body; the hook claw is vertically arranged, the middle part of the hook claw is fixed on the annular body, and the top of the hook claw is turned outwards to form a bent part; the hook claw is positioned at the adjacent inner side of the movement limiting convex ring, the bent part is hooked at the upper side of the movement limiting convex ring, and the upper side of the bent part abuts against the bottom of the needle head seat; a spreading conical surface with a small upper part and a big lower part is coaxially arranged on the tenon and below the locking convex ring; when the tenon is locked on the needle head seat, the bracing conical surface is propped against the lower part of the inner side of the hook claw to enable the upper part of the hook claw to turn inwards, and then the bending part is enabled to be inwards bent to the inner side of the limiting convex ring. The structure is simple.

Description

Needle head limiting structure

Technical Field

The utility model belongs to the technical field of syringes, and particularly relates to a needle head limiting structure.

Background

Currently, syringes are the most commonly used, and are one of the largest volume medical devices used. In recent years, disposable sterile syringes have become popular for the control of iatrogenic infectious diseases and to avoid cross-contamination and other adverse effects. However, the existing disposable syringes have the defects of intact use, reusability, no safety device, exposed needle after injection and the like. On one hand, the disposable syringe is easy to be utilized by the heart molecules, and the disposable syringe which is discarded after being used is reused, so that the transmission and cross infection of viruses are easily caused; on the other hand, the needle after injection is still remained outside, which not only brings inconvenience to the carrying and destroying of the garbage in the injector relative to the sharpness degree of the needle, but also often happens that the needle tip is exposed to injure the user carelessly. Many countries have passed legislation that emphasizes the necessity of using safe self-destructive syringes.

The existing self-destruction syringe usually comprises a syringe, a needle seat, a core rod in the syringe, a stopper ring in the syringe and used for fixing the needle seat and the like. The locking and unlocking structure of the needle seat is complex.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the embodiment of the utility model provides a needle head limiting structure, which adopts a new structure to fix a needle head seat, and adopts a hooking mode to fix a limiting ring so as to fix the needle head seat; the tenon is inserted into the needle head seat, meanwhile, the lower part of the limiting ring is propped open by the propping conical surface, the upper part of the limiting ring moves inwards to realize unlocking, and the needle head seat and the limiting ring are driven by the core rod to move downwards together; the whole structure is simple, and the processing and the assembly are convenient. The technical scheme is as follows:

the embodiment of the utility model provides a needle head limiting structure, which comprises a limiting ring 1, a limiting convex ring 3 at the inner upper part of a needle cylinder 2, an annular bulge 5 at the inner lower part of a needle head seat 4 and a locking convex ring 7 which is arranged on a tenon 6 and matched with the annular bulge 5; the locking convex ring 7 can upwards penetrate through the annular bulge 5 and be locked, and the stop collar 1 is of an annular structure; the stop collar 1 comprises an annular body 8 and a plurality of hooks 9 uniformly distributed on the annular body; the hook claw 9 is vertically arranged, the middle part of the hook claw is fixed on the annular body 8, and the top part of the hook claw is turned outwards to form a bent part 10; the hook claw 9 is positioned at the adjacent inner side of the movement limiting convex ring 3, the bent part 10 is hooked at the upper side of the movement limiting convex ring 3, and the upper side of the bent part abuts against the bottom of the needle head seat 4; a spreading conical surface 11 with a small upper part and a big lower part is coaxially arranged on the tenon 6 and below the locking convex ring 7; when the tenon 6 is locked on the needle head seat 4, the stretching conical surface 11 is abutted against the lower part of the inner side of the hook claw 9 to enable the upper part of the hook claw 9 to turn inwards, and further the bending part 10 is enabled to be inwards bent to the inner side of the limiting convex ring 3.

Wherein, the annular body 8 and the needle cylinder 2 in the embodiment of the utility model are coaxially arranged, and the outer diameter of the annular body is smaller than the inner diameter of the movement limiting convex ring 3.

Specifically, the number of the four hooks 9 in the embodiment of the present invention is four, and the four hooks 9 are arranged in a central symmetry manner around the center of the circular body 8.

The hook claw 9 in the embodiment of the utility model is an arc sheet which is coaxial with the annular body 8 and has an L-shaped structure; the outer side of the bending part 10 is an arc surface coaxially arranged with the annular body 8.

Preferably, the top outer side of the bending part 10 in the embodiment of the present invention is a rounded corner or a bevel; the limiting convex ring 3 is an annular structure coaxial with the needle cylinder 2, the lower side surface of the limiting convex ring is obliquely arranged from bottom to top, and the inner diameter of the limiting convex ring is larger than the outer diameter of the needle head seat 4.

Preferably, the lower portion of the inner side of the hook claw 9 in the embodiment of the present invention is an inclined surface which is obliquely arranged from top to bottom.

The diameter of the upper part of the expanding conical surface 11 in the embodiment of the utility model is smaller than the inner diameter of the stop collar 1, and the diameter of the lower part of the expanding conical surface is larger than the inner diameter of the stop collar 1; the outer diameter of the bending part 10 is smaller than the inner diameter of the needle cylinder 2 but larger than the inner diameter of the stop convex ring 3.

Specifically, the expanding conical surface 11 in the embodiment of the present invention is provided at the lower end of the tenon 6.

Preferably, a mandrel conical surface 12 with a small upper part and a large lower part is coaxially arranged on the tenon 6 and between the locking convex ring 7 and the stretching conical surface 11 in the embodiment of the utility model, the mandrel conical surface 12 can penetrate upwards from the stop collar 1, the mandrel conical surface 12 abuts against the lower side of the annular protrusion 5, the lower side of the annular protrusion 5 is a conical surface matched with the mandrel conical surface 12, and the top end of the hook claw 9 is positioned below the mandrel conical surface 12 when the upper part is turned inwards.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a needle head limiting structure, which adopts a new structure to fix a needle head seat, adopts a hooking mode to fix a limiting ring and further fixes the needle head seat; the tenon is inserted into the needle head seat, meanwhile, the lower part of the limiting ring is propped open by the propping conical surface, the upper part of the limiting ring moves inwards to realize unlocking, and the needle head seat and the limiting ring are driven by the core rod to move downwards together; the whole structure is simple, and the processing and the assembly are convenient.

Drawings

FIG. 1 is a schematic view of a needle stop arrangement according to an embodiment of the present invention, shown without the tenon inserted therein;

FIG. 2 is a schematic view of the needle stop arrangement of an embodiment of the present invention with the tenon inserted;

FIG. 3 is a schematic view of the stop collar;

fig. 4 is a top view of the stop collar.

In the figure: 1 stop collar, 2 syringe, 3 stop collars, 4 needle seat, 5 annular bulge, 6 tenon, 7 locking collars, 8 annular body, 9 hook claw, 10 bending part, 11 expanding conical surface and 12 core rod conical surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-4, an embodiment of the present invention provides a needle head movement limiting structure, which includes a movement limiting ring 1 (disposed coaxially with a needle cylinder 2), a movement limiting convex ring 3 (for fixing a needle head seat 4) on an inner upper portion of the needle cylinder 2, an annular protrusion 5 on an inner lower portion of the needle head seat 4, and a locking convex ring 7 (disposed coaxially with the tenon 6) on the tenon 6 and engaged with the annular protrusion 5. The locking convex ring 7 can penetrate through the annular bulge 5 upwards and be locked, and the stop collar 1 is of an annular structure. The structure is basically consistent with the existing needle head limiting structure, and the difference is that: the stop collar 1 in this embodiment includes an annular body 8 and a plurality of hooks 9 uniformly distributed (annularly distributed) thereon. The hook claw 9 is vertically arranged, the middle part of the hook claw is fixed on the annular body 8 (specifically, integrally formed), the top part of the hook claw is outwards turned to form a bent part 10, and the joint of the bent part and the annular body 8 can be deformed to realize the turning (inwards turning) of the hook claw 9. Wherein, the annular body 8 is a whole circular ring or is composed of a plurality of circular arcs between adjacent hook claws 9. The hook claw 9 (non-bending part 10) is positioned at the adjacent inner side of the movement limiting convex ring 3, the bending part 10 is hooked at the upper side of the movement limiting convex ring 3, and the upper side of the bending part abuts against the bottom of the needle seat 4. A stretching conical surface 11 with a small upper part and a big lower part is coaxially arranged on the tenon 6 and below the locking convex ring 7 and is used for stretching the lower part of the hook claw 9 outwards. When the tenon 6 is locked on the needle head seat 4 (the annular bulge 5 is matched with the locking convex ring 7), the bracing and expanding conical surface 11 is propped against the lower part of the inner side of the hook claw 9 to ensure that the upper part of the hook claw 9 turns inwards, and further the bending part 10 inwards reaches the inner side of the limiting convex ring 3 to ensure that the needle head seat 4 can downwards cross the limiting convex ring 3.

Referring to fig. 1-4, the hook 9 in the embodiment of the present invention is an arc piece coaxial with the annular body 8, and has an L-shaped structure (formed with the bending portion 10). The outside of the bending part 10 is a circular arc surface (located at the adjacent inside of the inner wall of the needle cylinder 2) which is coaxial with the annular body 8.

Preferably, referring to fig. 1-3, the outside of the top of the bent portion 10 in the embodiment of the present invention is rounded or beveled to facilitate the installation of the stop collar 1. The limiting convex ring 3 is an annular structure coaxial with the needle cylinder 2, the lower side surface of the limiting convex ring is obliquely provided with a taper hole from bottom to top so as to be convenient for installing the limiting ring 1, and the inner diameter of the limiting convex ring is larger than the outer diameter of the needle head seat 4.

Preferably, referring to fig. 1-3, the lower portion of the inner side of the hook claw 9 in the embodiment of the present invention is a slope that is disposed obliquely outward from top to bottom so as to facilitate the insertion of the tenon 6.

Referring to fig. 1 and 2, in the embodiment of the present invention, the diameter of the upper portion of the expanding conical surface 11 is smaller than the inner diameter of the stop collar 1 (specifically, the inner diameter of the circle surrounded by the hooks 9), and the diameter of the lower portion of the expanding conical surface is larger than the inner diameter of the stop collar 1 (specifically, the inner diameter of the circle surrounded by the hooks 9). The outer diameter of the bending part 10 is smaller (slightly smaller) than the inner diameter of the needle cylinder 2 but larger than the inner diameter of the stop collar 3.

Specifically, referring to fig. 2, the expanding taper 11 in the present embodiment is provided at the lower end of the tenon 6 (and also above the piston on the core rod).

Preferably, referring to fig. 2, a core rod conical surface 12 with a small top and a large bottom is coaxially arranged on the tenon 6 of the embodiment of the present invention and between the locking convex ring 7 and the expanding conical surface 11, the core rod conical surface 12 can pass through the stopper ring 1 upwards, the core rod conical surface 12 abuts against the lower side of the annular protrusion 5, the lower side of the annular protrusion 5 is a conical surface matched with the core rod conical surface 12 (at this time, the core rod conical surface 12 is flush with the bottom of the needle base 4 or is located adjacent to and above the bottom of the needle base 4) to form a conical hole, an annular groove for accommodating the claw 9 is formed between the annular protrusion 5 and the expanding conical surface 11, and the top end of the claw 9 is located below the core rod conical surface 12 when the upper part of the claw 9 is turned inwards. The conical surface 12 of the core rod contacts the top of the stop collar 1 before the tenon 6 is locked with the annular bulge 5, so that the stop collar is prevented from rebounding and is convenient to pull down.

Specifically, referring to fig. 2, the locking collar 7 in this embodiment is a cone with a small top and a large bottom, the diameter of the bottom of the locking collar 7 is smaller than the inner diameter of the needle base 4 but larger than the inner diameter of the annular protrusion 5, and the inner diameter of the annular protrusion 5 is larger than the diameter of the tenon 6; when the locking tongue 6 is locked, the lower side of the locking collar 7 abuts against the upper side of the annular protrusion 5.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A needle head limiting structure comprises a limiting ring (1), a limiting convex ring (3) at the inner upper part of a needle cylinder (2), an annular bulge (5) at the inner lower part of a needle head seat (4) and a locking convex ring (7) which is arranged on a tenon (6) and matched with the annular bulge (5); the locking convex ring (7) can upwards penetrate through the annular bulge (5) and be locked, and the stop collar (1) is of an annular structure; the stop collar (1) is characterized by comprising an annular body (8) and a plurality of hook claws (9) uniformly distributed on the annular body; the hook claws (9) are vertically arranged, the middle parts of the hook claws are fixed on the annular body (8), and the top parts of the hook claws are turned outwards to form bending parts (10); the hook claw (9) is positioned at the adjacent inner side of the movement limiting convex ring (3), the bent part (10) is hooked at the upper side of the movement limiting convex ring (3), and the upper side of the bent part is propped against the bottom of the needle head seat (4); a stretching conical surface (11) which is small in upper part and large in lower part is coaxially arranged on the tenon (6) and below the locking convex ring (7); when the tenon (6) is locked on the needle head seat (4), the stretching conical surface (11) is propped against the lower part of the inner side of the hook claw (9) to enable the upper part of the hook claw (9) to turn inwards, and then the bending part (10) is enabled to inwards reach the inner side of the limiting convex ring (3).

2. Needle stop according to claim 1, characterized in that said annular body (8) is arranged coaxially to the barrel (2) and has an outer diameter smaller than the inner diameter of the stop collar (3).

3. A needle tip movement limiting structure according to claim 2, characterized in that the number of the hook claws (9) is four, and four hook claws (9) are arranged in a central symmetry manner around the center of the ring-shaped body (8).

4. A needle tip movement limiting structure according to claim 3, characterized in that the hook claw (9) is an arc piece arranged coaxially with the annular body (8) and is of an L-shaped structure; the outer side of the bending part (10) is an arc surface which is coaxial with the annular body (8).

5. A needle tip movement limiting structure according to claim 4, characterized in that the top outside of the bending part (10) is rounded or beveled; the limiting convex ring (3) is of an annular structure coaxial with the needle cylinder (2), the lower side surface of the limiting convex ring is obliquely arranged from bottom to top, and the inner diameter of the limiting convex ring is larger than the outer diameter of the needle head seat (4).

6. A needle tip movement limiting structure according to claim 1, wherein the lower portion of the inner side of the hook claw (9) is a slant surface which is obliquely arranged from top to bottom.

7. A needle stop arrangement according to claim 4, characterized in that the diameter of the upper part of the spreading cone (11) is smaller than the inner diameter of the stop collar (1) and the diameter of the lower part is larger than the inner diameter of the stop collar (1); the outer diameter of the bending part (10) is smaller than the inner diameter of the needle cylinder (2) but larger than the inner diameter of the movement limiting convex ring (3).

8. A needle tip movement limiting structure according to claim 1, characterized in that the spreading cone (11) is provided at the lower end of the tenon (6).

9. The needle movement limiting structure according to claim 1, wherein a core rod conical surface (12) with a small top and a large bottom is coaxially arranged on the tenon (6) and between the locking convex ring (7) and the expanding conical surface (11), the core rod conical surface (12) can penetrate upwards from the movement limiting ring (1), the core rod conical surface (12) abuts against the lower side of the annular protrusion (5), the lower side of the annular protrusion (5) is a conical surface matched with the core rod conical surface (12), and the top end of the hook claw (9) is positioned below the core rod conical surface (12) when the upper part is turned inwards.