CN215585084U - Needle seat rotation limiting structure - Google Patents

Abstract

The utility model discloses a needle head seat rotation limiting structure, and belongs to the technical field of syringes. The syringe comprises a syringe, a core rod and a syringe needle seat, wherein the lower end of the syringe needle seat is provided with a flange, the outer side of the flange is symmetrically provided with two inner limiting lugs, the upper end of the core rod is provided with a tenon, an inner spline is coaxially arranged on the tenon and below an annular bulge, a locking convex ring is arranged in the syringe needle seat, and the locking convex ring is an outer spline matched with the inner spline; a limiting ring is coaxially arranged at the upper part in the needle cylinder, two outer limiting lugs are symmetrically arranged at the inner side of the limiting ring, the inner limiting lugs are abutted against the upper sides of the outer limiting lugs at the corresponding sides and are positioned at the inner sides of the limiting ring, and the outer limiting lugs are positioned at the outer sides of the needle head seat; when the tenon is inserted in the needle head seat, the annular bulge is positioned above the external spline, the internal spline is embedded in the external spline and is used for leading the core bar to drive the needle head seat to rotate, and the needle head seat rotatably transfers the external limiting lug to be staggered with the corresponding internal limiting lug.

Description

Needle seat rotation limiting structure

Technical Field

The utility model belongs to the technical field of syringes, and particularly relates to a needle seat rotation 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 patent with application number CN201510039595.6 discloses a stop gear of needle head seat in retraction formula safety syringe, including setting up the spacing unit one that is used for restricting syringe needle seat rebound between cylinder and syringe needle seat and setting up the spacing unit two that is used for restricting syringe needle seat rebound between cylinder and syringe needle seat, the cylinder inside wall on have a convex shoulder, the convex shoulder downside has the spacing portion that stretches out downwards, spacing unit two including spacing portion and the stopper ring that is located the cylinder, the stopper ring on have and be annular expansion portion, the expansion portion be located between spacing portion and the cylinder lateral wall, the expansion portion supports and leans on the spacing portion, spacing portion inwards buckle and support and lean on the syringe needle seat, the expansion portion supports and leans on the cylinder inside wall, interference fit between spacing portion, expansion portion and the cylinder.

In the prior art, the limiting mechanism of the needle head seat is adopted, and the needle head seat is stably limited in the needle cylinder by arranging a limiting part which extends downwards on the side wall of the needle cylinder and under the action of an expansion piece (namely, the lower part of the limiting part 1b is bent inwards (propped against the lower side of the needle head seat) and is inserted in a ring groove formed by a conical surface 3 b). However, the aforementioned structure has at least the following two problems:

(1) an expansion piece is needed, and the expansion piece is difficult to form;

(2) when the injector is assembled, the end part of the core rod is propped against (if not aligned) the limiting part, and the limiting part is easy to break off;

(3) when the limiting part is bent inwards, the limiting part is easy to break.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the embodiment of the utility model provides a needle head seat rotation limiting structure, a new structure is adopted to fix a needle head seat, an expansion piece is not needed, a mechanical clamping mode is adopted for fixing, part deformation is not needed, and the problem that a limiting part is easy to break in the prior art is solved. The technical scheme is as follows:

the embodiment of the utility model provides a needle head seat rotation limiting structure, which comprises a needle cylinder 1, a core rod 2 and a needle head seat 4 at the upper end of the needle cylinder 1, wherein the lower end of the needle head seat 4 is provided with a flange 41, the upper end of the core rod 2 is coaxially provided with a tenon 21 with an annular bulge 22, and the inner lower part of the needle head seat 4 is coaxially provided with a locking convex ring matched with the tenon 21; a stop ring 5 is coaxially arranged at the upper part in the needle cylinder 1; an inner spline 23 is coaxially arranged on the tenon 21 and below the annular bulge 22, and the locking convex ring is an outer spline 42 matched with the inner spline 23; two inner limiting lugs 43 are symmetrically arranged on the outer side of the flange 41, two outer limiting lugs 51 are symmetrically arranged on the inner side of the limiting ring 5, the inner limiting lugs 43 are abutted against the upper side of the outer limiting lugs 51 on the corresponding side and are positioned on the inner side of the limiting ring 5, and the outer limiting lugs 51 are positioned on the outer side of the flange 41; when the tenon 21 is inserted into the needle base 4, the annular protrusion 22 is located above the external spline 42, the internal spline 23 is embedded into the external spline 42 to enable the needle base 4 to be driven by the core bar 2 to rotate, and the needle base 4 rotationally transfers the external limiting lug 51 to be dislocated with the corresponding internal limiting lug 43 to enable the needle base 4 to be driven by the core bar 2 to move downwards.

The stopper ring 5 in the embodiment of the present invention is a circular ring, the top of the syringe 1 is coaxially provided with a stepped groove 11 matched with the flange 41, the lower side of the stepped groove 11 is coaxially provided with a ring groove 12 for mounting the stopper ring 5, the stopper ring 5 is embedded into the ring groove 12, the diameter of the stepped groove 11 is smaller than the inner diameter of the syringe 1, and the outer diameter of the stopper ring 5 is larger than the diameter of the ring groove 12.

Preferably, the outer edge of the upper side of the stop collar 5 in the embodiment of the present invention is beveled or rounded.

The inner limiting lug 43 in the embodiment of the present invention is a strip-shaped block arranged along the radial direction of the flange 41, and is coplanar with the flange 41, and the outer side of the strip-shaped block is an arc surface concentric with the flange 41; the outer limiting lug 51 is a strip-shaped block arranged along the radial direction of the limiting ring 5, is coplanar with the limiting ring 5, and has an arc surface with the inner side concentric with the limiting ring 5.

Specifically, the outer diameter of the inner detent projections 43 in the present embodiment is larger than the inner diameter of the outer detent projections 51 but smaller than the inner diameter of the detent ring 5, and the inner diameter of the outer detent projections 51 is larger than the outer diameter of the flange 41.

The annular bulge 22 in the embodiment of the present invention is arranged at the upper end of the tenon 21 and is a conical structure coaxially arranged with the tenon 21, the diameter of the rear end of the annular bulge 22 is greater than the inner diameter of the external spline 42, the inner diameter of the external spline 42 is less than the outer diameter of the internal spline 23, and the outer diameter of the internal spline 23 is less than the inner diameter of the lower part of the needle base 4.

Specifically, the external spline 42 in the embodiment of the present invention is formed by eight pieces of uniformly distributed external flat keys, and the internal spline 23 is formed by four pieces of uniformly distributed internal flat keys.

Furthermore, the front end of the syringe 1 in the embodiment of the present invention is provided with a through hole for the upper part of the needle base 4 to penetrate through, the needle base 4 is sleeved with a sealing ring 3, and the sealing ring 3 is arranged between the inner side of the front end of the syringe 1 and the upper side of the flange 41.

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 seat rotation limiting structure, a novel structure is adopted to fix a needle head seat, an expansion piece is not needed, a mechanical clamping mode is adopted for fixing, part deformation is not needed, and the problem that a limiting part is easy to break in the prior art is solved.

Drawings

FIG. 1 is a schematic view of the structure of the syringe assembled with the needle holder;

FIG. 2 is a schematic view of the core pin of FIG. 1 as assembled;

FIG. 3 is a schematic view of the structure when the core rod is rotated;

FIG. 4 is a schematic view showing the structure when the core bar is pulled out downward;

FIG. 5 is a schematic view of the structure of the cylinder;

FIG. 6 is a schematic structural view of a core rod;

FIG. 7 is a schematic view of the needle mount;

FIG. 8 is a bottom view of the needle mount;

FIG. 9 is a schematic view of the stop collar;

FIG. 10 is a schematic view of the outer motion-limiting projection blocking the inner motion-limiting projection;

FIG. 11 is a schematic view of the combination of the internal spline and the external spline;

fig. 12 is a schematic structural view of the outer motion-limiting projection being misaligned with the inner motion-limiting projection.

In the figure: 1 syringe, 2 core bar, 3 sealing ring, 4 needle seat, 5 needle seat, 6 stop collar;

11 step grooves and 12 ring grooves;

21 tenon, 22 annular bulge and 23 internal spline;

flange 41, external spline 42, internal limiting lug 43;

51 externally restraining the lugs.

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. 1-12, the embodiment of the present invention provides a needle base rotation limiting structure, which includes a needle cylinder 1, a core rod 2 (disposed coaxially with the needle cylinder 1, and provided with a piston at an upper end thereof), a needle base 4 (disposed coaxially with the needle cylinder 1, and having a front end thereof protruding forward from the needle cylinder 1) at an upper end of the needle cylinder 1, and the like, wherein a flange 41 (annular structure disposed coaxially with the needle base 4) is provided at a lower end of the needle base 4, a tenon 21 (round rod structure) having an annular protrusion 22 is coaxially provided at an upper end of the core rod 2, a locking convex ring (the tenon 21 can pass through (strong force) is coaxially provided at an inner lower portion of the needle base 4, and a lower portion of the annular protrusion 22 abuts against the locking convex ring to enable the needle base 4 to move downward). The structure is basically the same as that of the existing self-destruction syringe, and the difference is that:

in this embodiment, a stopper ring 5 is coaxially disposed at the upper portion of the needle cylinder 1 for fixing the needle head seat 4. The tenon 21 is coaxially provided with an internal spline 23 below the annular protrusion 22 (and above the piston), the locking convex ring is an external spline 42 matched with the internal spline 23, and the internal spline 23 and the external spline 42 are arranged in a staggered manner. Two inner limiting lugs 43 are symmetrically arranged on the outer side of the flange 41, two outer limiting lugs 51 are symmetrically arranged on the inner side of the limiting ring 5, the inner limiting lugs 43 on the same side are matched with the outer limiting lugs 51, the inner limiting lugs 43 abut against the upper side of the outer limiting lugs 51 on the corresponding side (on the same side) (so as to realize the sealing effect of the sealing ring 3) to block the downward movement of the needle seat 4 (to fix the needle seat 4) and are positioned on the inner side of the limiting ring 5 to ensure that the staggered needle seat 4 can move downward, and the outer limiting lugs 51 are positioned on the outer side of the flange 41 to ensure that the staggered needle seat 4 can move downward. When the tenon 21 is inserted into the needle base 4 (at this time, the upper end of the core rod 2 can be abutted against the lower side of the stopper ring 5 (which can be a conical surface matched with the top of the piston), the thickness of the stopper ring 5 preferably ensures that the piston is not abutted against the needle base 4), the annular protrusion 22 is located above the external spline 42, the internal spline 23 is embedded into the external spline 42 to enable the core rod 2 to drive the needle base 4 to rotate, the needle base 4 rotationally transfers the external stopper lug 51 to be staggered with the corresponding internal stopper lug 43 to enable the core rod 2 to drive the needle base 4 to move downwards, the core rod 2 is pulled downwards, and the needle base 4 passes through the stopper ring 5 downwards.

Referring to fig. 1-5, the stopper ring 5 in the embodiment of the present invention is a circular ring (thinner, and can be pressed to the ring groove 12 by a strong force), the top of the syringe 1 is coaxially provided with a stepped groove 11 that is matched with the flange 41, the lower side of the stepped groove 11 is coaxially provided with the ring groove 12 for mounting the stopper ring 5, the stopper ring 5 is embedded in the ring groove 12, the diameter of the stepped groove 11 (slightly larger than the outer diameter of the flange 41, and almost the same as the inner diameter of the stopper ring 5) is smaller than the inner diameter of the syringe 1, and the outer diameter of the stopper ring 5 is larger than the diameter of the ring groove 12 to ensure that the stopper ring 5 is fixed stably.

Preferably, referring to fig. 1-4, the upper outer edge of the stop collar 5 in embodiments of the present invention is beveled or rounded to facilitate assembly of the stop collar 5.

With reference to fig. 8-10 and 12, the inner stopper protrusion 43 in the embodiment of the present invention is a bar-shaped block disposed along the radial direction of the flange 41, and is coplanar with the flange 41 (flush with the upper and lower surfaces), and has an outer circular arc surface concentric with the flange 41. The outer stopper projection 51 is a bar-shaped block disposed along the radial direction of the stopper ring 5, and is coplanar with the stopper ring 5 (the upper and lower surfaces are flush), and the inner side thereof is an arc surface concentric with the stopper ring 5.

Specifically, referring to fig. 10-12, the outer diameter of the inner detent projections 43 in embodiments of the present invention is greater than the inner diameter of the outer detent projections 51 but less than the inner diameter of the detent ring 5, and the inner diameter of the outer detent projections 51 is greater than the outer diameter of the flange 41.

2-4 and 11, the annular protrusion 22 in the embodiment of the present invention is provided at the upper end of the tenon 21 and has a conical structure (smaller at the top and larger at the bottom) coaxially arranged with the tenon 21 to ensure that the tenon 21 can be inserted into the locking convex ring, the diameter of the rear end of the annular protrusion 22 is larger than the inner diameter of the external spline 42, the inner diameter of the external spline 42 is smaller than the outer diameter of the internal spline 23, and the outer diameter of the internal spline 23 is smaller than the inner diameter of the lower part of the needle holder 4.

Specifically, referring to fig. 8 and 11, the external spline 42 in the embodiment of the present invention is composed of eight evenly distributed external flat keys (vertically arranged), and the internal spline 23 is composed of four evenly distributed internal flat keys (vertically arranged), but is not limited to this patent. Preferably, the distance between two adjacent external splines 42 is much greater than the width of the internal spline 23 to facilitate insertion.

Further, referring to fig. 1-4, the front end of the syringe 1 in the embodiment of the present invention is provided with a through hole (a vertically arranged round hole with a diameter slightly larger than the outer diameter of the needle base 4) for the upper part of the needle base 4 to penetrate through, the needle base 4 is sleeved with a sealing ring 3 (coaxially arranged with the needle base 4), and the sealing ring 3 is arranged between the inner side of the front end of the syringe 1 and the upper side of the flange 41.

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 (8)

1. A needle head seat rotation limiting structure comprises a needle cylinder (1), a core rod (2) and a needle head seat (4) at the upper end of the needle cylinder (1), wherein a flange (41) is arranged at the lower end of the needle head seat (4), a tenon (21) with an annular bulge (22) is coaxially arranged at the upper end of the core rod (2), and a locking convex ring matched with the tenon (21) is coaxially arranged at the inner lower part of the needle head seat (4); it is characterized in that a stop collar (5) is coaxially arranged at the upper part in the needle cylinder (1); an inner spline (23) is coaxially arranged on the tenon (21) and below the annular bulge (22), and the locking convex ring is an outer spline (42) matched with the inner spline (23); the outer side of the flange (41) is symmetrically provided with two inner limiting lugs (43), the inner side of the limiting ring (5) is symmetrically provided with two outer limiting lugs (51), the inner limiting lugs (43) are abutted against the upper side of the outer limiting lugs (51) on the corresponding side and are positioned on the inner side of the limiting ring (5), and the outer limiting lugs (51) are positioned on the outer side of the flange (41); when the tenon (21) is inserted into the needle head seat (4), the annular bulge (22) is positioned above the external spline (42), the internal spline (23) is embedded into the external spline (42) and is used for enabling the needle head seat (4) to be driven by the core rod (2) to rotate, and the needle head seat (4) rotationally transfers the external limiting lug (51) to be staggered with the corresponding internal limiting lug (43) so that the needle head seat (4) can be driven by the core rod (2) to move downwards.

2. Needle base rotation stop structure according to claim 1, characterized in that stop ring (5) is a circular ring, the top of syringe (1) is coaxially provided with a stepped groove (11) matching flange (41), the lower side of stepped groove (11) is coaxially provided with a ring groove (12) for mounting stop ring (5), stop ring (5) is embedded into ring groove (12), the diameter of stepped groove (11) is smaller than the inner diameter of syringe (1), and the outer diameter of stop ring (5) is larger than the diameter of ring groove (12).

3. Needle holder rotation stop arrangement according to claim 1, characterized in that the upper outer edge of the stop collar (5) is beveled or rounded.

4. Needle holder rotation limitation arrangement according to claim 1, characterized in that the inner limitation projection (43) is a bar-shaped block arranged radially along the flange (41), coplanar with the flange (41), and on the outside of which is an arc concentric with the flange (41); the outer limiting convex block (51) is a strip-shaped block arranged along the radial direction of the limiting ring (5), is coplanar with the limiting ring (5), and has an inner side which is a circular arc surface concentric with the limiting ring (5).

5. Needle holder rotation stop arrangement according to claim 4, characterized in that the outer diameter of the inner stop lug (43) is larger than the inner diameter of the outer stop lug (51) but smaller than the inner diameter of the stop collar (5), the inner diameter of the outer stop lug (51) being larger than the outer diameter of the flange (41).

6. Needle base rotation limitation structure according to claim 1, characterized in that said annular protrusion (22) is provided at the upper end of said tenon (21) and is a conical structure coaxially arranged with said tenon (21), the diameter of the rear end of said annular protrusion (22) is larger than the inner diameter of said external spline (42), the inner diameter of said external spline (42) is smaller than the outer diameter of said internal spline (23), and the outer diameter of said internal spline (23) is smaller than the inner diameter of the lower part of said needle base (4).

7. Needle holder rotation limitation according to claim 6, characterized in that the external splines (42) consist of eight evenly distributed external flat splines and the internal splines (23) consist of four evenly distributed internal flat splines.

8. The needle base rotation limiting structure of claim 1, wherein the front end of the needle cylinder (1) is provided with a through hole for the upper part of the needle base (4) to penetrate through, the needle base (4) is sleeved with a sealing ring (3), and the sealing ring (3) is arranged between the inner side of the front end of the needle cylinder (1) and the upper side of the flange (41).

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