CN215585087U - Movement limiting structure of needle seat - Google Patents

Abstract

The utility model discloses a movement limiting structure of a needle head seat, and belongs to the technical field of syringes. Comprises a needle cylinder, a core rod and a needle head seat, wherein the upper end of the core rod is coaxially provided with a tenon with an annular bulge, and the inner lower part of the needle head seat is coaxially provided with a locking convex ring matched with the tenon; an inner spline is coaxially arranged on the tenon and below the annular bulge, and the locking convex ring is an outer spline matched with the inner spline; the needle cylinder is provided with N needle heads, N needle heads are arranged on the outer side of the needle heads, N needle heads are evenly distributed around the axis of the needle heads, N needle heads matched with the needle heads are arranged on the inner upper portion of the needle cylinder, the needle heads and the needle heads are arranged in a staggered mode and are arranged in the vertical direction, and hook claws are arranged at the upper ends of the needle heads; after the tenon upwards passes through the locking convex ring, the internal spline is embedded into the external spline, meanwhile, the hook part passes through the two adjacent locking parts, and after the needle head seat is driven by the core rod to rotate, the hook claw is hooked on the upper side of the locking part at the same side. Has the advantages of simple structure, no need of an expansion piece, no need of bending of parts and the like.

Description

Movement limiting structure of needle seat

Technical Field

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

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 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) the limiting part is also used for breaking when being bent inwards.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the embodiment of the utility model provides a limiting structure of a needle head seat, a novel structure is adopted to fix the needle head seat, an expansion piece is not needed, the needle head seat is fixed in a rotating and hooking mode, the deformation of parts 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 limiting structure of a needle head seat, which comprises a needle cylinder 1, a core rod 2 of the needle cylinder 1 and a needle head seat 3 at the upper end of the needle cylinder 1, wherein the needle head seat is vertically arranged, 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 3 is coaxially provided with a locking convex ring 31 matched with the tenon 21; an inner spline 23 is coaxially arranged on the tenon 21 and below the annular bulge 22, and the locking convex ring 31 is an outer spline matched with the inner spline 23; n hook parts 4 are uniformly distributed on the outer side of the needle head seat 3 around the axis of the needle head seat, N locking parts 5 matched with the hook parts 4 are arranged on the upper portion in the needle cylinder 1, the hook parts 4 and the locking parts 5 are arranged in a staggered mode and are arranged along the vertical direction, and hook claws 41 are arranged at the upper end of the hook parts 4; after the tenon 21 upwards passes through the locking convex ring 31, the internal spline 23 is embedded into the external spline, meanwhile, the hook part 4 passes through between two adjacent locking parts 5, and after the needle head seat 3 is driven by the core bar 2 to rotate, the hook claw 41 is hooked on the upper side of the locking part 5 on the same side.

The hooking part 4 in the embodiment of the present invention includes a strip-shaped part 42 and a hook claw 41 at the top end of the strip-shaped part 42, the hook claw 41 is perpendicular to the strip-shaped part 42, and the hook claws 41 of all the hooking parts 4 are located on the same side; the locking part 5 and the strip-shaped part 42 are vertically arranged strip-shaped blocks; after the tenon 21 passes through the locking convex ring 31, the hook claw 41 reaches the top of the needle cylinder 1 and is positioned above and adjacent to the locking part 5.

Preferably, a guide portion 6 is arranged beside each locking portion 5 and between the locking portion 5 and the adjacent hooking portion 4, and the guide portion 6 is vertically arranged and is located on one side of the locking portion 5 away from the hooking claw 41; the lower end of the locking part 5 is connected with the lower end of the guiding part 6 beside the locking part through a closing part 7 to form a locking component 8, and the hook parts 4 and the locking component 8 are arranged in a staggered mode; when the hook portion 4 upwardly passes through two adjacent locking assemblies 8, the locking assemblies 8 of which both sides are respectively located on the corresponding sides are adjacent.

Specifically, the guide portion 6 in the embodiment of the present invention is a bar-shaped block arranged vertically, the closing portion 7 is a bar-shaped block perpendicular to the guide portion 6, and an upper end of the guide portion 6 extends upward relative to an upper end of the locking portion 5.

Preferably, the top of the hook 4 in the embodiment of the present invention is a sharp shape with a small top and a large bottom.

Preferably, the upper end of the locking portion 5 and the side close to the hook claw 41 in the embodiment of the present invention are rounded, and the lower sides of the connection portions of the closing portion 7 and the hook portion 4 and the locking portion 5 are rounded.

Specifically, the number of the hook portions 4 and the lock portions 5 in the embodiment of the present invention is four.

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 arranged coaxially with the tenon 21, the diameter of the lower end of the annular bulge 22 is greater than the inner diameter of the locking convex ring 31, the inner diameter of the locking convex ring 31 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 base 3.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a limiting structure of a needle head seat, which adopts a new structure to fix the needle head seat without an expansion piece, adopts a new structure to fix the needle head seat without the expansion piece, adopts a rotating and hooking mode to fix without part deformation, and avoids the problem that a limiting part is easy to break in the prior art.

Drawings

FIG. 1 is a schematic view of the structure of a syringe;

FIG. 2 is a schematic structural view of a core rod;

FIG. 3 is a schematic view of the needle mount;

FIG. 4 is a cross-sectional view of the needle mount;

FIG. 5 is a schematic view of the barrel, needle mount and core pin as assembled;

FIG. 6 is a schematic view of the locking collar in combination with the internal spline;

FIG. 7 is a schematic structural view of the combination of the hooking part and the locking part before locking;

FIG. 8 is a schematic view of the hook and lock combination after locking;

fig. 9 is a schematic view showing a structural comparison of the locking assembly.

In the figure: 1 syringe, 2 core bar, 3 needle seat, 4 hook part, 5 locking part, 6 guiding part, 7 sealing part, 8 locking component;

21 tenon, 22 annular bulge and 23 internal spline;

31 locking the convex ring;

41 hook claws and 42 strip-shaped parts.

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. 1-8, the embodiment of the present invention provides a movement limiting structure of a needle base, which includes a vertically disposed syringe 1, a core rod 2 (the upper end of which is provided with a piston and is disposed coaxially with the syringe 1) of the syringe 1, a needle base 3 (disposed coaxially with the syringe 1 and provided with a sealing ring between the needle base and the syringe 1) at the upper end of the syringe 1, and the like, wherein the upper end of the core rod 2 is coaxially provided with a tenon 21 having an annular protrusion 22, the lower portion of the inside of the needle base 3 is coaxially provided with a locking convex ring 31 (disposed coaxially with the needle base 3) which is matched with the tenon 21, and the tenon 21 can penetrate through the locking convex ring 31 and be locked (the needle base 3 can be driven to move downwards, and when locked, the lower side of the annular protrusion 22 abuts against the upper side of the locking convex ring 31). The structure is basically consistent with the existing limiting structure, and the difference is that: in this embodiment, the tenon 21 is coaxially provided with an internal spline 23 below the annular protrusion 22, the locking collar 31 is an external spline engaged with the internal spline 23 (so that the core rod 2 can drive the needle base 3 to rotate), and the internal spline 23 and the external spline are arranged in a staggered manner. The outer side of needle seat 3 and around its axis evenly distributed have N (specifically be more than or equal to 2 integer, preferred 4) hook portion 4, upper portion is equipped with in the syringe 1 with hook portion 4 complex N locking portion 5, N locking portion 5 around the axis evenly distributed of syringe 1. Hook portion 4 and locking portion 5 are crisscross to be set up and all set up along vertical direction, and the upper end (left side or right side) of hook portion 4 is equipped with colludes claw 41. After the tenon 21 upwards passes through the locking convex ring 31, the internal spline 23 is embedded into the external spline, so that the needle base 3 can be driven by the core bar 2 to rotate, meanwhile, the hook part 4 upwards passes through the space between the two adjacent locking parts 5, after the needle base 3 is driven by the core bar 2 to rotate (towards the locking part 5, at the moment, the hook claw 41 is positioned above the locking part 5), the hook claw 41 is hooked on the upper side of the locking part 5 (adjacent to the hook claw 41) on the same side, so that the needle base 3 is fixed. Conversely, the core rod 2 is rotated reversely to stagger the hook portion 4 and the locking portion 5, and then the core rod 2 is pulled downwards (the needle base 3 moves downwards due to the cooperation of the annular protrusion 22 and the locking convex ring 31), and the locking portion 5 passes through the space between two adjacent locking portions 5 downwards. Wherein, the hook part 4 is positioned at the adjacent inner side of the inner wall of the syringe 1, the locking part 5 is positioned at the adjacent outer side of the outer wall of the needle head seat 3, and the distance between the adjacent locking parts 5 is larger than the width of the hook part 4 (plus the hook claw 41).

Referring to fig. 3 to 8, the hook portions 4 in the embodiment of the present invention include a strip portion 42 and hook claws 41 at the top end (left side or right side) of the strip portion 42, the hook claws 41 are perpendicular to the strip portion 42, and the hook claws 41 of all the hook portions 4 are located on the same side (on the same left side or on the same right side). The locking part 5 and the bar-shaped part 42 are vertically arranged bar-shaped blocks. After the tenon 21 passes upward through the locking protrusion ring 31, the hook 41 is brought to the top of the cylinder 1 and is located adjacent to and above the locking part 5.

Preferably, referring to fig. 1 and 7-8, a guide portion 6 is provided beside each locking portion 5 and between the locking portion and the adjacent hook portion 4 to facilitate the insertion of the hook portion 4, and the guide portion 6 is vertically disposed and is located on a side of the locking portion 5 away from the hook claw 41. The lower extreme of locking portion 5 and the lower extreme of its guide portion 6 on one side (align with the lower extreme of locking portion 5) connect through closing part 7 (avoid hook portion 4 to insert) and form a locking Assembly 8 jointly (constitute similar U structure, the shaping and the drawing of patterns of being convenient for), the distance between locking portion 5 and its guide portion 6 on one side will guarantee to collude claw 41 and can the hook (the tip of colluding claw 41 can not lean on guide portion 6), hook portion 4 sets up with locking Assembly 8 is crisscross. When the hook portion 4 passes through two adjacent locking assemblies 8, two sides (including the hook claw 41, left and right sides) of the hook portion are respectively located adjacent to the corresponding locking assemblies 8. The locking assembly 8 can be understood in particular as a catch arranged opposite the hook 4, see fig. 9. Specifically, referring to fig. 1 and 7 to 8, the guide portion 6 in the embodiment of the present invention is a bar-shaped block vertically disposed, the closing portion 7 is a bar-shaped block perpendicular to the guide portion 6, and the upper end of the guide portion 6 (to the top of the cylinder 1) extends upward with respect to the upper end of the locking portion 5.

Preferably, referring to fig. 3 and 7-8, the top of the hooking portion 4 in the embodiment of the present invention is pointed with a small top and a large bottom to facilitate insertion.

Preferably, referring to fig. 1 and 7 to 8, in the embodiment of the present invention, the upper end of the locking portion 5 and a side close to the hook claw 41 are rounded to facilitate hooking of the hook claw 41, and the lower side of the junction of the closing portion 7 with the hook portion 4 and the locking portion 5 is rounded to facilitate insertion of the hook portion 4.

Specifically, referring to fig. 6, the number of the hook 4 and the locking portion 5 in the embodiment of the present invention is four, four hook 4 are symmetric with respect to the needle holder 3, and four locking portions 5 are symmetric with respect to the axis of the barrel 1.

Wherein, referring to fig. 2 and 5, the annular protrusion 22 in the embodiment of the present invention is arranged at the upper end of the tenon 21 and is a conical structure (with a small upper part and a large lower part) arranged coaxially with the tenon 21, the diameter of the lower end of the annular protrusion 22 is larger than the inner diameter of the locking convex ring 31, the inner diameter of the locking convex ring 31 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 base 3; when locked, the lower side of the annular projection 22 abuts against the upper side of the locking collar 31.

Specifically, referring to fig. 6, the external splines in the embodiment of the present invention are composed of eight evenly distributed external flat keys (vertically arranged), and the internal splines 23 are composed of four evenly distributed internal flat keys (vertically arranged), but the present patent is not limited thereto. Preferably, the distance between two adjacent external splines is much larger than the width of the internal spline 23 to facilitate insertion.

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. The limiting structure of the needle head seat comprises a vertically arranged needle cylinder (1), a core rod (2) of the needle cylinder (1) and a needle head seat (3) at the upper end of the needle cylinder (1), wherein 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 (31) matched with the tenon (21) is coaxially arranged at the inner lower part of the needle head seat (3); the locking structure is characterized in that an inner spline (23) is coaxially arranged on the tenon (21) and below the annular bulge (22), and the locking convex ring (31) is an outer spline matched with the inner spline (23); n hook parts (4) are uniformly distributed on the outer side of the needle head seat (3) and around the axis of the needle head seat, N locking parts (5) matched with the hook parts (4) are arranged on the inner upper part of the needle cylinder (1), the hook parts (4) and the locking parts (5) are arranged in a staggered mode and are arranged along the vertical direction, and hook claws (41) are arranged at the upper end of the hook parts (4); after the tenon (21) upwards passes through the locking convex ring (31), the internal spline (23) is embedded into the external spline, meanwhile, the hook part (4) passes through the space between two adjacent locking parts (5), and after the needle head seat (3) is driven by the core rod (2) to rotate, the hook claw (41) is hooked on the upper side of the locking part (5) on the same side.

2. The needle head base movement limiting structure according to claim 1, characterized in that the hooking portions (4) comprise a strip-shaped portion (42) and hooking claws (41) at the top end of the strip-shaped portion (42), the hooking claws (41) are perpendicular to the strip-shaped portion (42), and the hooking claws (41) of all the hooking portions (4) are located on the same side; the locking part (5) and the strip-shaped part (42) are vertically arranged strip-shaped blocks; after the tenon (21) upwards passes through the locking convex ring (31), the hook claw (41) is connected to the top of the needle cylinder (1) and is positioned above the adjacent locking part (5).

3. A needle holder movement limiting structure according to claim 2, characterized in that a guide portion (6) is provided beside each locking portion (5) and between the locking portion and the adjacent hooking portion (4), the guide portion (6) is vertically arranged and is located on the side of the locking portion (5) far away from the hooking claw (41); the lower end of the locking part (5) is connected with the lower end of the guiding part (6) beside the locking part through a closing part (7) to form a locking assembly (8), and the hook parts (4) and the locking assembly (8) are arranged in a staggered mode; when the hook part (4) upwards passes through two adjacent locking components (8), the two sides of the hook part are respectively adjacent to the locking components (8) on the corresponding sides.

4. Needle holder movement limiting structure according to claim 3, characterized in that the guide (6) is a vertically arranged bar-shaped block and the closing part (7) is a bar-shaped block perpendicular to the guide (6), the upper end of the guide (6) extending upwards in relation to the upper end of the locking part (5).

5. Needle holder movement-limiting structure according to claim 3, characterized in that the top of the hooking portion (4) is pointed, with a small top and a large bottom.

6. The needle base movement limiting structure according to claim 5, characterized in that the upper end of the locking part (5) and the side close to the hook claw (41) are rounded, and the lower side of the joint of the closing part (7) and the hook part (4) and the locking part (5) is rounded.

7. Needle holder movement limiting arrangement according to claim 1, characterized in that the number of hooking portions (4) and locking portions (5) is four.

8. The needle base movement limiting structure of claim 1, characterized in that the annular protrusion (22) is arranged at the upper end of the tenon (21) and is a conical structure arranged coaxially with the tenon (21), the diameter of the lower end of the annular protrusion (22) is larger than the inner diameter of the locking convex ring (31), the inner diameter of the locking convex ring (31) 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 base (3).

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