CN215585072U - An active spring retraction safety syringe - Google Patents

Abstract

The utility model discloses an active spring retraction safety syringe, and belongs to the technical field of syringes. The syringe needle assembly comprises a spring seat, a syringe needle and a spring, wherein the spring seat is oval, a thin film sealing sheet is arranged at the inner top of the plunger, and the spring is arranged between the upper side of the spring seat and the top of the syringe needle; an occlusion structure is arranged between the lower side of the fixing ring and the top end of the plunger, a sealing ring is arranged between the upper side of the fixing ring and the needle cylinder and outside the spring seat, and an elliptical hole is arranged in the middle of the fixing ring; an elliptical cavity is arranged at the upper part in the needle cylinder; the upper part of the spring seat is positioned in the oval cavity, the lower side of the spring seat is abutted against the upper side of the fixing ring and is vertical to the oval hole; the top of plunger combines through the interlock structure during to solid fixed ring's downside, and rotatory plunger drives solid fixed ring rotatory, and solid fixed ring is rotatory to predetermined angle after, the elliptical hole is passed downwards to the spring holder, and the spring holder punctures the film gasket and lets the syringe needle subassembly fall into in the plunger.

Description

Active spring retraction safety syringe

Technical Field

The utility model belongs to the technical field of syringes, and particularly relates to an active spring retraction safety syringe.

Background

Retractable syringes are becoming extremely important and ideal for use in hospitals and medical facilities for a number of reasons. In particular, retractable syringes are generally limited to single use, wherein the hypodermic needle of the syringe is retracted into the syringe after aspiration and injection of fluid, thus preventing potential transmission of disease between multiple use syringes and Human Immunodeficiency Virus (HIV) and other patients. Retracting the needle back into the syringe after use also shields the needle and prevents inadvertent needle sticks or punctures to patients and healthcare workers.

A syringe is disclosed in patent application No. CN 201110094183.4, comprising: a hollow syringe having an opening at a proximal end of the syringe, an opening at a distal end of the syringe, and a fluid chamber disposed in the syringe; a hollow plunger extending into the barrel via the proximal opening of the barrel and axially movable in the barrel toward and away from the distal opening of the barrel, wherein the plunger has an end wall releasably secured to the plunger at an opening provided at a distal end of the plunger and movable from the plunger distal opening to access a retraction cavity provided in the plunger during use of the syringe; a needle assembly secured at least partially in and near the distal end of the barrel, the needle assembly having a needle holder, a resilient member biasing the needle holder toward the proximal opening of the barrel, and a retaining member releasably secured to the needle holder via a reduced material section, wherein the needle holder has a connector to secure a needle to the needle holder to allow the needle to extend through the distal opening of the barrel; wherein the plunger, the retaining member and the needle holder are configured such that the retaining member retains the needle holder against the bias of the resilient member at the distal end of the barrel and when the plunger is sufficiently pressed into the barrel, the plunger engages the needle holder to force the end wall of the plunger into the plunger and to force the retaining member to disengage and separate from the needle holder along said reduced material section to facilitate retraction of the end wall, the needle holder and the needle secured to the needle holder into the retraction cavity, wherein the retaining member comprises a retaining ring disposed around the proximal end of the needle holder and the reduced material section comprises at least one annular relief section defined between the retaining ring and the needle holder, and wherein the retaining ring has at least one projection extending from a surface of the retaining ring facing the plunger, and the plunger and needle assembly are further configured such that in combination with movement of the plunger towards the distal end of the barrel, the at least one projection of the retaining ring causes the retaining ring to be continuously separated from the needle holder along the annular notch portion when the at least one projection engages the distal end of the plunger.

Most of spring needles are designed to be of an automatic retraction type, which is also the reason that people dislike spring needles at present, according to medical experts and actual use observation, at the moment when the spring needle injection is completed, an annotator sees or imagines that the needle point can suddenly rebound, so that the psychology is not very easy to accept, but most importantly, the elasticity of the spring cannot be estimated and controlled, and the spring slightly jumps on the surface layer of the skin or in the blood vessel, so that the blood vessel and the skin can be carelessly broken, secondary injury is caused, and the phenomenon often happens and cannot be avoided; the use of a self-retracting pogo pin has not been proposed for a long time. In addition, the spring needle may need to be cleaned in advance before use, and misoperation (such as excessive upward pushing) may occur to cause self-destruction.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, embodiments of the present invention provide an active spring retraction safety syringe, which can artificially control the rebound of a needle, and does not cause poor experience and secondary injury to a patient, and also does not cause self-destruction due to misoperation. The technical scheme is as follows:

the embodiment of the utility model provides an active spring retraction safety syringe, which comprises a vertically arranged syringe 1, a needle assembly 2 at the top of the syringe 1, a hollow plunger 3 in the syringe 1 and a fixing ring 4 which can rotate at the upper part in the syringe 1, wherein the top of the plunger 3 is open and can contain the needle assembly 2; the needle head assembly 2 comprises a spring seat 5, a needle head 6 coaxially arranged on the spring seat 5 and a spring 7 sleeved on the needle head 6, the spring seat 5 is oval and coaxially arranged with the needle cylinder 1, a thin film sealing sheet 8 which can be punctured by the spring seat 5 is arranged at the inner top of the plunger 3, and the spring 7 is arranged between the upper side of the spring seat 5 and the top of the needle cylinder 1; a mutually matched occlusion structure is arranged between the lower side of the fixing ring 4 and the top end of the plunger 3, a sealing ring 9 is arranged between the upper side of the fixing ring and the needle cylinder 1 and outside the spring seat 5, and an elliptical hole 10 which can be penetrated by the spring seat 5 at a preset angle is coaxially arranged in the middle of the fixing ring and the needle cylinder; an oval cavity 11 which is used for accommodating the spring seat 5 and matched with the spring seat 5 is coaxially arranged at the upper part in the needle cylinder 1; the upper part of the spring seat 5 is positioned in the oval cavity 11, the lower side of the spring seat abuts against the upper side of the fixing ring 4, and the spring seat is vertical to the oval hole 10; the top of plunger 3 combines through the interlock structure during to solid fixed ring 4's downside, and rotatory plunger 3 drives solid fixed ring 4 rotatory, gu fixed ring 4 is rotatory after predetermined angle, spring holder 5 passes elliptical hole 10 downwards by the drive of spring 7, spring holder 5 punctures film gasket 8 and lets syringe needle subassembly 2 fall into in the plunger 3.

Wherein, the fixing ring 4 in the embodiment of the utility model is a circular plate which is coaxially arranged with the needle cylinder 1, and the diameter of the fixing ring is smaller than the inner diameter of the needle cylinder 1; a limiting ring 12 is coaxially arranged at the upper part in the needle cylinder 1; the outer edge of the lower side of the fixing ring 4 is abutted against the upper side of the limiting ring 12, and the outer diameter of the fixing ring is larger than the inner diameter of the limiting ring 12.

The sealing ring 9 in the embodiment of the present invention is coaxially disposed with the needle cylinder 1 and is disposed between the upper side of the fixing ring 4 and the shoulder 13 of the needle cylinder 1.

Specifically, the elliptical hole 10 in the embodiment of the utility model has a minor axis smaller than the major axis of the spring seat 5, a minor axis larger than the minor axis of the spring seat 5, and a major axis larger than the major axis of the spring seat 5.

Furthermore, an upper circular cavity 14 for accommodating the upper part of the spring 7 is coaxially arranged at the upper part of the needle cylinder 1 and above the oval cavity 11 in the embodiment of the utility model, a lower circular cavity 15 for accommodating the lower part of the spring 7 is coaxially arranged at the upper side of the spring seat 5, and the upper part and the lower part of the spring 7 are respectively arranged in the upper circular cavity 14 and the lower circular cavity 15.

The occlusion structure in the embodiment of the utility model comprises a plurality of lower occlusion teeth 16 uniformly distributed at the upper end of the plunger 3 and a plurality of upper occlusion teeth 17 matched with the lower occlusion teeth 16 and at the lower side of the fixing ring 4; a plurality of upper engaging teeth 17 are uniformly distributed in a ring shape, are arranged around the elliptical hole 10, and are staggered with the lower engaging teeth 16 one by one.

Specifically, the upper engaging teeth 17 and the lower engaging teeth 16 in the embodiment of the present invention are both conical teeth and each number is 6.

Preferably, the lower end of the needle 6 in the embodiment of the present invention protrudes downward out of the spring seat 5 and is a sharp portion; the spring seat 5 is in clearance fit with the oval cavity 11, and a conical bulge 18 with a large upper part and a small lower part is arranged in the oval hole 10 at the middle part of the lower side of the spring seat.

Specifically, the spring seat 5 can only pass through the elliptical hole 10 when the included angle between the fixing ring 4 and the spring seat 5 in the embodiment of the present invention is less than 45 °.

Preferably, the outer edge of the upper side of the fixing ring 4 in the embodiment of the present invention is disposed obliquely downward from inside to outside, and the lower side of the limiting ring 12 is disposed obliquely downward from inside to outside.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides an active spring retraction safety syringe, which can artificially control the rebound of a needle head, does not bring bad experience and secondary injury to a patient, and does not cause self-destruction caused by misoperation. And has the advantages of simple structure, stable use, convenient operation and the like.

Drawings

FIG. 1 is a schematic view of an embodiment of an active spring retraction safety syringe;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic view of the active spring retraction safety syringe of FIG. 1 after self-destruction;

FIG. 4 is a schematic view of the plunger construction;

FIG. 5 is a schematic view of the construction of the needle assembly;

FIG. 6 is a bottom view of the retaining ring;

FIG. 7 is a schematic view of the structure of the fixing ring in the longitudinal direction;

FIG. 8 is a schematic view of the structure of the fixing ring in the short axis direction;

FIG. 9 is a schematic view of the combination of the retainer ring and the plunger;

FIG. 10 is a schematic view of the structure of the lower and upper teeth combination;

FIG. 11 is a schematic view of the spring seat of FIG. 1 in combination with an elliptical hole;

FIG. 12 is a schematic view of the spring seat of FIG. 2 in combination with an elliptical hole;

fig. 13 is a schematic view of the combination of an elliptical lumen and an upper circular lumen.

In the figure: the syringe comprises a syringe barrel 1, a needle assembly 2, a plunger 3, a fixing ring 4, a spring seat 5, a needle 6, a spring 7, a membrane sealing sheet 8, a sealing ring 9, an elliptical hole 10, an elliptical cavity 11, a limiting ring 12, a shoulder 13, an upper circular cavity 14, a lower circular cavity 15, a lower meshing tooth 16, an upper meshing tooth 17 and a conical bulge 18.

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 to 13, an embodiment of the present invention provides an active spring retraction safety syringe, which includes a vertically arranged syringe 1, a needle assembly 2 (coaxially arranged with the syringe 1 and capable of moving downward) on the top of the syringe 1, a hollow plunger 3 (coaxially arranged with the syringe 1 and having a hollow structure (specifically, a circular cavity) in the syringe 1, and having a piston at an upper end thereof), and a fixing ring 4 (for fixing the needle assembly 2) capable of rotating at an upper portion in the syringe 1, and the like, wherein the top of the plunger 3 is open and capable of accommodating the needle assembly 2. Wherein, syringe needle subassembly 2 includes spring holder 5, spring holder 5 and cylinder 1 are upwards worn out to the syringe needle 6 (the upper end of coaxial setting on the spring holder 5 upwards, set up spring 7 (with the coaxial setting of syringe needle 6) etc. on syringe needle 6 with the cover, spring holder 5 (cross section) is oval in order to avoid its rotation and its and the coaxial setting of cylinder 1, the top is equipped with the film gasket 8 that can be stabbed by spring holder 5 (sharp portion) in plunger 3, 8 levels of film gasket set up and it seals plunger 3 in order to avoid the injection to get into. The spring 7 is arranged between the upper side of the spring seat 5 and the top of the syringe 1 (provided with a through hole for the needle 6 to pass through). A mutually matched meshing structure is arranged between the lower side of the fixing ring 4 and the top end of the plunger 3 and used for driving the fixing ring 4 to rotate through the plunger 3, a sealing ring 9 is arranged between the upper side of the fixing ring and the needle cylinder 1 and outside the spring seat 5 to play a sealing role, and an elliptical hole 10 (larger than the section of the spring seat 5) through which the spring seat 5 can pass at a preset angle (arranged according to requirements, namely an included angle between the long axis of the spring seat 5 and the long axis of the elliptical hole 10 in the embodiment) is coaxially arranged in the middle of the fixing ring. An oval cavity 11 (with an open lower side) which is used for accommodating the spring seat 5 and is matched with the spring seat 5 is coaxially arranged at the upper part in the needle cylinder 1. The upper portion of the spring seat 5 is located in the elliptical cavity 11, the lower side of the spring seat abuts against the upper side of the fixing ring 4, and the (long axis) of the spring seat is perpendicular to the elliptical hole 10 (long axis) (of course, the present embodiment may also be at other angles (for example, greater than a predetermined angle (greater is needed for more stability)), so as to ensure that the spring seat 5 cannot pass through the elliptical hole 10, and the perpendicular angle is the most stable angle), so that the spring seat 5 cannot pass through the elliptical hole 10. The top end of the plunger 3 is combined with the lower side of the fixing ring 4 through the occlusion structure, the plunger 3 is rotated to drive the fixing ring 4 to rotate, the fixing ring 4 rotates to a preset angle, the spring seat 5 is driven by the spring 7 to downwards penetrate through the elliptical hole 10, and the spring seat 5 (sharp part) pierces the thin film sealing piece 8 to enable the needle assembly 2 to fall into the plunger 3.

In which, referring to fig. 1-3 and 6-9, the fixing ring 4 in the embodiment of the present invention is a circular plate disposed coaxially with the cylinder 1, and has a diameter smaller (slightly smaller) than the inner diameter of the cylinder 1. The upper part in the syringe 1 is coaxially provided with a limit ring 12 (circular ring bulge) for fixing the fixing ring 4. The outer edge of the lower side of the fixing ring 4 is abutted against the upper side of the limiting ring 12, and the outer diameter of the fixing ring is larger than the inner diameter of the limiting ring 12.

Referring to fig. 1-3, the sealing ring 9 of the present invention is disposed coaxially with the syringe 1 and between the upper side of the fixing ring 4 and the shoulder 13 of the syringe 1.

Specifically, referring to fig. 11-12, the elliptical hole 10 in the present embodiment has a minor axis that is smaller than the major axis of the spring seat 5, a minor axis that is larger than the minor axis of the spring seat 5, and a major axis that is larger than the major axis of the spring seat 5. The oblong holes 10 and the major and minor axes of the spring seat 5 are arranged as required to ensure that the spring seat 5 can pass through the oblong holes 10 only when the angle is less than or equal to a predetermined angle.

Further, referring to fig. 1 to 3 and 13, an upper circular cavity 14 (circular cavity and lower side open, and its diameter is slightly larger than the outer diameter of the spring 7) for accommodating an upper portion of the spring 7 is coaxially disposed above the elliptical cavity 11 in the syringe 1 according to the embodiment of the present invention, a lower circular cavity 15 (circular cavity and upper side open, and its diameter is slightly larger than the outer diameter of the spring 7) for accommodating a lower portion of the spring 7 is coaxially disposed above the spring seat 5, and upper and lower portions of the spring 7 are respectively disposed in the upper circular cavity 14 and the lower circular cavity 15 to ensure the stability of the spring 7.

Wherein, referring to fig. 1-4 and 6-10, the engagement structure in the embodiment of the present invention comprises a plurality of lower engagement teeth 16 (evenly distributed in a circle with the axis of the cylinder 1) evenly distributed at the upper end of the plunger 3 and a plurality of upper engagement teeth 17 at the lower side of the fixed ring 4 and engaged with the lower engagement teeth 16; the plurality of upper engaging teeth 17 are uniformly distributed in a ring shape (along the axis of the needle cylinder 1), are arranged around the elliptical hole 10 (outside the elliptical hole 10), and are arranged in a one-to-one staggered manner with the lower engaging teeth 16 to realize engagement. The structure ensures the quick combination of the plunger 3 and the fixing ring 4 and avoids self-destruction caused by misoperation (small-angle rotation).

Specifically, referring to fig. 1-4 and 6-10, the upper and lower engaging teeth 17 and 16 in the embodiment of the present invention are each a conical tooth and each number is 6. The upper engaging teeth 17 and the lower engaging teeth 16 can be automatically guided, after being completely combined, the spring seat 5 is ensured to be perpendicular to the elliptical hole 10 (the most stable, the angle for inducing self-destruction each time is ensured to be fixed so as to avoid habitual rotation self-destruction), and in addition, when the upper engaging teeth 17 and the lower engaging teeth 16 are combined, the fixing ring 4 is required to be completely combined only by rotating a small angle (for example, less than 15 degrees) so as to avoid self-destruction caused by injection and exhaust.

Preferably, referring to fig. 1-3 and 5, the lower end of the needle 6 in the embodiment of the present invention protrudes downward out of the spring seat 5 (and also out of the tapered protrusion 18) and it is a sharp portion (specifically, a tapered sharp portion, while facilitating the mounting of the needle 6). Spring seat 5 and oval chamber 11 clearance fit, its downside middle part just is equipped with big end down's toper arch 18 in being located elliptical hole 10 and is used for further reaming the broken film sealing piece 8 and guaranteeing that spring seat 5 passes through. Specifically, the conical projection 18 in this embodiment is a cone that is disposed coaxially with the needle 6, and the lower end of the needle 6 protrudes downward (slightly beyond) the lower end of the conical projection 18.

Specifically, referring to fig. 12, when the included angle between the fixed ring 4 and the spring seat 5 in the embodiment of the present invention is smaller than 45 ° (specifically, the fixed ring 4 rotates 65 ° in the embodiment), the spring seat 5 can pass through the elliptical hole 10. The rotation angle in this embodiment is relatively large, and self-destruction caused by slight rotation is avoided.

Preferably, referring to fig. 1 to 3, the outer edge of the upper side of the fixing ring 4 in the embodiment of the present invention is obliquely downward arranged from inside to outside to form a conical surface, and the lower side of the limiting ring 12 is obliquely downward arranged from inside to outside to form a conical surface. The foregoing structure facilitates the mounting of the fixing ring 4.

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 (10)

1. An active spring retraction safety syringe comprises a vertically arranged needle cylinder (1), a needle assembly (2) at the top of the needle cylinder (1) and a hollow plunger (3) in the needle cylinder (1), wherein the top of the plunger (3) is open and can contain the needle assembly (2); characterized in that the utility model also comprises a fixing ring (4) which is arranged at the upper part in the needle cylinder (1) and can rotate; the needle head assembly (2) comprises a spring seat (5), a needle head (6) coaxially arranged on the spring seat (5) and a spring (7) sleeved on the needle head (6), the spring seat (5) is oval and coaxially arranged with the needle cylinder (1), a thin film sealing sheet (8) capable of being punctured by the spring seat (5) is arranged at the inner top of the plunger (3), and the spring (7) is arranged between the upper side of the spring seat (5) and the top of the needle cylinder (1); a mutually matched occlusion structure is arranged between the lower side of the fixing ring (4) and the top end of the plunger (3), a sealing ring (9) is arranged between the upper side of the fixing ring and the needle cylinder (1) and outside the spring seat (5), and an elliptical hole (10) through which the spring seat (5) can pass at a preset angle is coaxially arranged in the middle of the fixing ring; an oval cavity (11) which is used for accommodating the spring seat (5) and matched with the spring seat (5) is coaxially arranged at the upper part in the needle cylinder (1); the upper part of the spring seat (5) is positioned in the oval cavity (11), the lower side of the spring seat abuts against the upper side of the fixing ring (4), and the spring seat is vertical to the oval hole (10); the top of plunger (3) combines through the interlock structure during to the downside of solid fixed ring (4), and rotatory plunger (3) drive solid fixed ring (4) rotatory, gu fixed ring (4) rotate to predetermined angle after, spring holder (5) are driven by spring (7) and are passed elliptical hole (10) downwards, spring holder (5) are punctureed film gasket (8) and are let syringe needle subassembly (2) fall into in plunger (3).

2. The active spring retraction safety syringe according to claim 1, characterized in that the fixation ring (4) is a circular plate arranged coaxially with the needle cylinder (1) and having a diameter smaller than the inner diameter of the needle cylinder (1); a limiting ring (12) is coaxially arranged at the upper part in the needle cylinder (1); the outer edge of the lower side of the fixing ring (4) abuts against the upper side of the limiting ring (12), and the outer diameter of the fixing ring is larger than the inner diameter of the limiting ring (12).

3. An active spring retraction safety syringe according to claim 1, characterized in that the sealing ring (9) is arranged coaxially with the needle cylinder (1) and it is provided between the upper side of the fixation ring (4) and the shoulder (13) of the needle cylinder (1).

4. The active spring retraction safety syringe according to claim 1, characterized in that the minor axis of the elliptical hole (10) is smaller than the major axis of the spring seat (5), its minor axis is larger than the minor axis of the spring seat (5), and its major axis is larger than the major axis of the spring seat (5).

5. An active spring retraction safety syringe according to claim 1, characterized in that an upper circular cavity (14) for accommodating the upper part of the spring (7) is coaxially arranged in the upper part of the syringe (1) above the oval cavity (11), a lower circular cavity (15) for accommodating the lower part of the spring (7) is coaxially arranged in the upper side of the spring seat (5), and the upper and lower parts of the spring (7) are respectively arranged in the upper circular cavity (14) and the lower circular cavity (15).

6. The active spring retraction safety syringe according to claim 1, characterized in that the snap structure comprises a plurality of lower snap teeth (16) evenly distributed at the upper end of the plunger (3) and a plurality of upper snap teeth (17) at the lower side of the fixed ring (4) and cooperating with the lower snap teeth (16); the upper occlusion teeth (17) are uniformly distributed in an annular shape, are arranged around the elliptical hole (10), and are staggered with the lower occlusion teeth (16) one by one.

7. The active spring retraction safety syringe according to claim 6, characterized in that the upper and lower meshing teeth (17, 16) are both conical teeth and are each 6 in number.

8. An active spring retraction safety syringe according to claim 1, characterized in that the lower end of the needle (6) is passed down out of the spring seat (5) and it is a sharp part; spring holder (5) and oval chamber (11) clearance fit, its downside middle part just is located elliptical hole (10) and is equipped with big end up's toper arch (18).

9. The active spring retraction safety syringe according to claim 1, characterized in that the spring seat (5) can only pass through the oblong hole (10) when the angle between the fixing ring (4) and the spring seat (5) is less than 45 °.

10. The active spring retraction safety syringe according to claim 2, characterized in that the upper outer edge of the fixing ring (4) is disposed obliquely downward from inside to outside, and the lower side of the limit ring (12) is disposed obliquely downward from inside to outside.

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