Active spring retraction safety syringe

Abstract

The invention discloses an active spring retraction safety syringe, which belongs to the technical field of syringes. The syringe comprises a syringe, a needle assembly, a plunger and a fixing ring, wherein the needle assembly comprises a spring seat, a needle and a spring, wherein the spring seat is elliptical, a thin film sealing sheet is provided at the top of the plunger, and the spring is provided between the upper side of the spring seat and the top of the syringe; an engaging structure is provided between the lower side of the fixing ring and the top of the plunger, a sealing ring is provided between the upper side and the syringe and outside the spring seat, and an elliptical hole is provided in the middle thereof; an elliptical cavity is provided in the upper part of the syringe; the upper part of the spring seat is located in the elliptical cavity, and the lower side thereof abuts against the upper side of the fixing ring, which is perpendicular to the elliptical hole; when the top of the plunger reaches the lower side of the fixing ring, the occlusal structure is combined, and the fixing ring is driven to rotate by rotating the plunger, and after the fixing ring rotates to a predetermined angle, the spring seat passes downward through the elliptical hole, and the spring seat pierces the thin film sealing sheet to allow the needle assembly to fall into the plunger.

Description

Technical Field

[0001] The invention belongs to the technical field of syringes, and in particular relates to an active spring retracting safety syringe. Background Art

[0002] Retractable syringes are becoming extremely important and desirable for use in hospitals and medical facilities for a number of reasons. Specifically, retractable syringes are typically limited to single use, where the hypodermic needle of the syringe is retracted into the syringe after aspiration and injection of the fluid, thus preventing multiple use of the syringe and potential transmission of human immunodeficiency virus (HIV) and other patient-to-patient borne diseases. Retracting the needle into the syringe after use also shields the needle and prevents inadvertent needle sticks or punctures for patients and healthcare personnel.

[0003] For example, the patent with application number CN 201110094183.4 discloses a syringe, comprising: a hollow syringe having an opening at the proximal end of the syringe, an opening at the distal end of the syringe and a fluid chamber provided in the syringe; a hollow plunger extending into the syringe via the proximal opening of the syringe and being able to move axially in the syringe toward and away from the distal opening of the syringe, wherein the plunger has an end wall which is releasably fixed to the plunger at the opening provided at the distal end of the plunger and is able to move from the distal opening of the plunger during use of the syringe so as to reach a retraction cavity provided in the plunger; a needle assembly at least partially fixed in the distal end of the syringe and located near the distal end of the syringe, the needle assembly having a needle clamp, an elastic component biasing the needle clamp toward the proximal opening of the syringe, and a retaining component releasably fixed to the needle clamp via a reduced material portion, wherein the needle clamp has a connector to fix the needle to the needle clamp so as to allow the needle to extend through the distal opening of the syringe; wherein the plunger, retaining component and needle gripper are configured such that the retaining component retains the needle gripper at the distal end of the syringe against the bias of the elastic component, and when the plunger is fully pressed into the syringe, the plunger engages the needle gripper to force the plunger end wall into the plunger and forces the retaining component to disengage and separate from the needle gripper along the reduced material portion to facilitate retraction of the end wall, the needle gripper and the needle fixed to the needle gripper into the retraction cavity, wherein the retaining component includes a retaining ring disposed around the proximal end of the needle gripper, and the reduced material portion includes at least one annular notch portion defined between the retaining ring and the needle gripper, and wherein the retaining ring has at least one protrusion extending from a surface of the retaining ring facing the plunger, and the plunger and needle assembly is further configured such that when, in conjunction with movement of the plunger toward the distal end of the syringe, at least one protrusion of the retaining ring engages the distal end of the plunger, causing the retaining ring to continuously separate from the needle gripper along the annular notch portion.

[0004] Most spring needles are designed to automatically retract, which is why people don’t like spring needles nowadays. According to medical experts and actual observations, when the spring needle is injected, if the recipient sees or imagines that the needle tip will suddenly rebound, it is not easy to accept psychologically. But the most important thing is that the elastic force of the spring is unpredictable and uncontrollable. The slightest jump on the surface of the skin or in the blood vessels will inadvertently pierce the blood vessels and skin, causing secondary damage. This is a common and unavoidable thing; therefore, the automatic retracting spring needle has been not recommended for a long time. In addition, the spring needle may need to be vented before use, and it may also cause self-destruction due to misoperation (such as excessive upward push). Summary of the invention

[0005] In order to solve the above problems, the embodiment of the present invention provides an active spring retracting safety syringe, which can manually control the rebound of the needle, will not give the patient a bad experience and secondary injury, and will not cause self-destruction due to misoperation. The technical solution is as follows:

[0006] The embodiment of the present invention provides an active spring retraction safety syringe, comprising 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 rotatable fixing ring 4 at the upper part of the syringe 1, wherein the top of the plunger 3 is open and can accommodate the needle assembly 2; the needle assembly 2 comprises a spring seat 5, a needle 6 coaxially arranged on the spring seat 5, and a spring 7 sleeved on the needle 6, wherein the spring seat 5 is elliptical and coaxially arranged with the syringe 1, a thin film sealing sheet 8 which can be punctured by the spring seat 5 is arranged at the 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 syringe 1; a mutually matching bite joint is arranged between the lower side of the fixing ring 4 and the top of the plunger 3 A sealing ring 9 is provided between its upper side and the syringe 1 and outside the spring seat 5, and an elliptical hole 10 is coaxially provided in the middle thereof for the spring seat 5 to pass through at a predetermined angle; an elliptical cavity 11 is coaxially provided in the upper inner part of the syringe 1 for accommodating the spring seat 5 and cooperating with the spring seat 5; the upper part of the spring seat 5 is located in the elliptical cavity 11, and the lower side of the spring seat 5 is against the upper side of the fixing ring 4, which is perpendicular to the elliptical hole 10; when the top end of the plunger 3 reaches the lower side of the fixing ring 4, it is combined through the bite structure, and the rotating plunger 3 drives the fixing ring 4 to rotate. After the fixing ring 4 rotates to a predetermined angle, the spring seat 5 is driven downward by the spring 7 to pass through the elliptical hole 10, and the spring seat 5 pierces the film sealing sheet 8 to allow the needle assembly 2 to fall into the plunger 3.

[0007] Among them, the fixing ring 4 in the embodiment of the present invention is a circular plate coaxially arranged with the syringe 1, and its diameter is smaller than the inner diameter of the syringe 1; a limiting ring 12 is coaxially arranged on the upper inner part of the syringe 1; the lower outer edge of the fixing ring 4 is against the upper side of the limiting ring 12, and its outer diameter is larger than the inner diameter of the limiting ring 12.

[0008] The sealing ring 9 in the embodiment of the present invention is coaxially arranged with the syringe 1 and is arranged between the upper side of the fixing ring 4 and the shoulder 13 of the syringe 1 .

[0009] Specifically, the minor axis of the elliptical hole 10 in the embodiment of the present invention is smaller than the major axis of the spring seat 5 , the minor axis thereof is larger than the minor axis of the spring seat 5 , and the major axis thereof is larger than the major axis of the spring seat 5 .

[0010] Furthermore, an upper circular cavity 14 for accommodating the upper part of the spring 7 is coaxially provided in the upper part of the syringe 1 in the embodiment of the present invention and located above the elliptical cavity 11, and a lower circular cavity 15 for accommodating the lower part of the spring 7 is coaxially provided on the upper side of the spring seat 5, and the upper and lower parts of the spring 7 are respectively located in the upper circular cavity 14 and the lower circular cavity 15.

[0011] Among them, the engaging structure in the embodiment of the present invention includes a plurality of lower engaging teeth 16 evenly distributed on the upper end of the plunger 3 and a plurality of upper engaging teeth 17 on the lower side of the fixing ring 4 and cooperating with the lower engaging teeth 16; the plurality of upper engaging teeth 17 are evenly distributed in a ring shape, which are arranged around the elliptical hole 10, and are staggered one by one with the lower engaging teeth 16.

[0012] Specifically, the upper meshing teeth 17 and the lower meshing teeth 16 in the embodiment of the present invention are both conical teeth and there are six of them.

[0013] Preferably, the lower end of the needle 6 in the embodiment of the present invention passes through the spring seat 5 downward and is a sharp part; the spring seat 5 is clearance-matched with the elliptical cavity 11, and a conical protrusion 18 with a larger upper part and a smaller lower part is provided in the middle of the lower side and located in the elliptical hole 10.

[0014] Specifically, the spring seat 5 can pass through the elliptical hole 10 only 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°.

[0015] Preferably, the upper outer edge of the fixing ring 4 in the embodiment of the present invention is arranged obliquely downward from the inside to the outside, and the lower side of the limiting ring 12 is arranged obliquely downward from the inside to the outside.

[0016] The technical solution provided by the embodiment of the present invention has the following beneficial effects: the embodiment of the present invention provides an active spring retractable safety syringe, which can manually control the rebound of the needle, will not give the patient a bad experience and secondary injury, and will not cause self-destruction due to misoperation. It has the advantages of simple structure, stable use, and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an active spring retraction safety syringe in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A partial enlarged view of

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure of an active spring retracting safety syringe after self-destruction;

[0020] Figure 4 It is a schematic diagram of the structure of the plunger;

[0021] Figure 5 is a schematic diagram of the structure of the needle assembly;

[0022] Figure 6 is a bottom view of the fixing ring;

[0023] Figure 7 It is a schematic diagram of the structure of the fixing ring in the long axis direction;

[0024] Figure 8 It is a schematic diagram of the structure of the fixed ring in the direction of the minor axis;

[0025] Fig. 9 It is a structural schematic diagram of the combination of a fixing ring and a plunger;

[0026] Fig.10 It is a schematic diagram of the structure of the combination of the lower occlusal teeth and the upper occlusal teeth;

[0027] Fig.11 yes Figure 1 A schematic diagram of the structure of the combination of the middle spring seat and the elliptical hole;

[0028] Fig.12 yes Figure 2 A schematic diagram of the structure of the combination of the middle spring seat and the elliptical hole;

[0029] Fig.13 It is a structural schematic diagram of the combination of an elliptical cavity and an upper circular cavity.

[0030] In the figure: 1 syringe, 2 needle assembly, 3 plunger, 4 fixing ring, 5 spring seat, 6 needle, 7 spring, 8 film sealing sheet, 9 sealing ring, 10 elliptical hole, 11 elliptical cavity, 12 limiting ring, 13 shoulder, 14 upper circular cavity, 15 lower circular cavity, 16 lower bite tooth, 17 upper bite tooth, 18 conical protrusion. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1-13The embodiment of the present invention provides an active spring retraction safety syringe, comprising a vertically arranged syringe 1, a needle assembly 2 at the top of the syringe 1 (coaxially arranged with the syringe 1 and capable of moving downward), a hollow plunger 3 in the syringe 1 (coaxially arranged with the syringe 1, which is a hollow structure (specifically a circular cavity), with a piston arranged at the upper end), and a rotatable fixing ring 4 in the upper part of the syringe 1 (for fixing the needle assembly 2), etc. The top of the plunger 3 is open and can accommodate the needle assembly 2. The needle assembly 2 includes a spring seat 5, a needle 6 coaxially arranged on the spring seat 5 (the upper end of which passes through the spring seat 5 and the syringe 1 upwards and is coaxially arranged with the syringe 1), and a spring 7 sleeved on the needle 6 (coaxially arranged with the needle 6), etc. The spring seat 5 (cross section) is elliptical to prevent it from rotating and is coaxially arranged with the syringe 1. A film sealing sheet 8 that can be punctured by the spring seat 5 (sharp part) is provided at the top of the plunger 3. The film sealing sheet 8 is arranged horizontally and seals the plunger 3 to prevent the injection liquid from entering. The spring 7 is arranged between the upper side of the spring seat 5 and the top of the syringe 1 (which is provided with a through hole for the needle 6 to pass through). A mutually matching bite structure is provided between the lower side of the fixing ring 4 and the top of the plunger 3 for driving the fixing ring 4 to rotate through the plunger 3. A sealing ring 9 is provided between the upper side of the fixing ring 4 and the syringe 1 and outside the spring seat 5 for sealing. An elliptical hole 10 (larger than the cross section of the spring seat 5) is coaxially provided in the middle part for the spring seat 5 to pass through at a predetermined angle (set as needed, in this embodiment, the angle between the long axis of the spring seat 5 and the long axis of the elliptical hole 10). An elliptical cavity 11 (open on the lower side) is coaxially provided in the upper part of the syringe 1 to accommodate the spring seat 5 and cooperate with the spring seat 5. Among them, the upper part of the spring seat 5 is located in the elliptical cavity 11, and its lower side is against the upper side of the fixing ring 4, and its (long axis) is perpendicular to the (long axis) of the elliptical hole 10 (of course, this embodiment can also be other angles (such as greater than the predetermined angle (in order to be more stable, it needs to be larger)), and it is necessary to ensure that the spring seat 5 cannot pass through the elliptical hole 10, and vertical is the most stable angle) to prevent the spring seat 5 from passing through the elliptical hole 10. When the top end of the plunger 3 reaches the lower side of the fixing ring 4, it is engaged through a bite structure. The rotating plunger 3 drives the fixing ring 4 to rotate. After the fixing ring 4 rotates to a predetermined angle, the spring seat 5 is driven downward by the spring 7 to pass through the elliptical hole 10. The spring seat 5 (the sharp part) pierces the film sealing sheet 8 to allow the needle assembly 2 to fall into the plunger 3.

[0033] Among them, see Figure 1-3 6-9, the fixing ring 4 in the embodiment of the present invention is a circular plate coaxially arranged with the syringe 1, and its diameter is smaller than (slightly smaller than) the inner diameter of the syringe 1. A limiting ring 12 (circular protrusion) is coaxially arranged in the upper part of the syringe 1 to fix the fixing ring 4. The lower outer edge of the fixing ring 4 abuts against the upper side of the limiting ring 12, and its outer diameter is larger than the inner diameter of the limiting ring 12.

[0034] Among them, see Figure 1-3The sealing ring 9 in the embodiment of the present invention is coaxially arranged with the syringe 1 and is arranged between the upper side of the fixing ring 4 and the shoulder 13 of the syringe 1 .

[0035] Specifically, see Figure 11-12 The minor axis of the elliptical hole 10 in the embodiment of the present invention is smaller than the major axis of the spring seat 5, the minor axis is larger than the minor axis of the spring seat 5, and the major axis is larger than the major axis of the spring seat 5. The major and minor axes of the elliptical hole 10 and the spring seat 5 are set as required to ensure that the spring seat 5 can pass through the elliptical hole 10 only when the angle is less than or equal to the predetermined angle.

[0036] Further, see Figure 1-3 13, an upper circular cavity 14 (a circular cavity with an open bottom, whose diameter is slightly larger than the outer diameter of the spring 7) for accommodating the upper part of the spring 7 is coaxially provided at the upper inner part of the syringe 1 in the embodiment of the present invention and located above the elliptical cavity 11, and a lower circular cavity 15 (a circular cavity with an open top, whose diameter is slightly larger than the outer diameter of the spring 7) for accommodating the lower part of the spring 7 is coaxially provided on the upper side of the spring seat 5, and the upper and lower parts of the spring 7 are respectively located in the upper circular cavity 14 and the lower circular cavity 15 to ensure the stability of the spring 7.

[0037] Among them, see Figure 1-4 6-10, the engagement structure in the embodiment of the present invention includes multiple lower engagement teeth 16 evenly distributed on the upper end of the plunger 3 (evenly distributed in a circle with the axis of the syringe 1) and multiple upper engagement teeth 17 on the lower side of the fixed ring 4 and matched with the lower engagement teeth 16; multiple upper engagement teeth 17 are evenly distributed in a ring shape (with the axis of the syringe 1), which are arranged around the elliptical hole 10 (arranged outside the elliptical hole 10), and are staggered one by one with the lower engagement teeth 16 to achieve engagement. The above structure ensures the rapid combination of the plunger 3 and the fixed ring 4 and avoids self-destruction caused by misoperation (small angle rotation).

[0038] Specifically, see Figure 1-4 6-10, the upper bite teeth 17 and the lower bite teeth 16 in the embodiment of the present invention are both conical teeth and the number is 6. The upper bite teeth 17 and the lower bite teeth 16 can be automatically guided. After being fully combined, the spring seat 5 must be vertical to the elliptical hole 10 (most stable, ensuring that the angle of self-destruction is fixed each time to avoid habitual rotation self-destruction). In addition, when the upper bite teeth 17 and the lower bite teeth 16 are combined, the fixing ring 4 is required to rotate only a small angle (such as less than 15°) to fully combine to avoid injection and exhaust triggering self-destruction.

[0039] Preferably, see Figure 1-35, the lower end of the needle 6 in the embodiment of the present invention passes through the spring seat 5 downward (and passes through the conical protrusion 18 at the same time) and is a sharp portion (specifically, an oblique sharp portion, which is convenient for the installation of the needle 6). The spring seat 5 is loosely matched with the elliptical cavity 11, and a conical protrusion 18 with a larger upper part and a smaller lower part is provided in the middle of the lower side and located in the elliptical hole 10 to further expand the punctured film sealing sheet 8 to ensure that the spring seat 5 passes through. Specifically, the conical protrusion 18 in this embodiment is a cone coaxially arranged with the needle 6, and the lower end of the needle 6 passes through the lower end of the conical protrusion 18 downward (just slightly).

[0040] Specifically, see Fig.12 In the embodiment of the present invention, the included angle between the fixing ring 4 and the spring seat 5 is less than 45° (specifically, in the embodiment, the fixing ring 4 rotates 65°), so that the spring seat 5 can pass through the elliptical hole 10. The rotation angle in the embodiment is relatively large to avoid self-destruction caused by a slight rotation.

[0041] Preferably, see Figure 1-3 The upper outer edge of the fixing ring 4 in the embodiment of the present invention is arranged to be inclined downward from the inside to the outside to form a cone surface, and the lower side of the limiting ring 12 is arranged to be inclined downward from the inside to the outside to form a cone surface. The above structure facilitates the installation of the fixing ring 4.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An active spring retraction safety syringe, comprising a vertically arranged syringe (1), a needle assembly (2) at the top of the syringe (1), and a hollow plunger (3) in the syringe (1), wherein the top of the plunger (3) is open and can accommodate the needle assembly (2); characterized in that: The invention also comprises a rotatable fixing ring (4) in the upper part of the syringe (1); the needle assembly (2) comprises a spring seat (5), a needle (6) coaxially arranged on the spring seat (5) and a spring (7) sleeved on the needle (6); the spring seat (5) is elliptical and coaxially arranged with the syringe (1); a thin film sealing sheet (8) which can be punctured by the spring seat (5) is provided at the top of the plunger (3); the spring (7) is arranged between the upper side of the spring seat (5) and the top of the syringe (1); a mutually matching bite structure is provided between the lower side of the fixing ring (4) and the top of the plunger (3); a sealing ring (9) is provided between the upper side and the syringe (1) and outside the spring seat (5); a spring seat (8) which can be punctured by the spring seat (5) is provided at the middle part thereof; The syringe (1) is provided with an elliptical hole (10) through which the spring seat (5) passes at a predetermined angle; the upper part of the syringe (1) is coaxially provided with an elliptical cavity (11) for accommodating the spring seat (5) and cooperating with the spring seat (5); the upper part of the spring seat (5) is located in the elliptical cavity (11), and the lower side thereof abuts against the upper side of the fixing ring (4), which is perpendicular to the elliptical hole (10); when the top end of the plunger (3) reaches the lower side of the fixing ring (4), it is combined through a bite structure, and the rotating plunger (3) drives the fixing ring (4) to rotate. After the fixing ring (4) rotates to a predetermined angle, the spring seat (5) is driven by the spring (7) to pass downward through the elliptical hole (10), and the spring seat (5) pierces the film sealing sheet (8) to allow the needle assembly (2) to fall into the plunger (3).

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

3. The active spring retraction safety syringe according to claim 1, characterized in that: The sealing ring (9) is coaxially arranged with the syringe (1) and is arranged between the upper side of the fixing ring (4) and the shoulder (13) of the syringe (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), the minor axis is larger than the minor axis of the spring seat (5), and the major axis is larger than the major axis of the spring seat (5).

5. The 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) and above the elliptical cavity (11); a lower circular cavity (15) for accommodating the lower part of the spring (7) is coaxially arranged on the upper side of the spring seat (5); and the upper and lower parts of the spring (7) are respectively located 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 engaging structure comprises a plurality of lower engaging teeth (16) evenly distributed on the upper end of the plunger (3) and a plurality of upper engaging teeth (17) on the lower side of the fixing ring (4) and cooperating with the lower engaging teeth (16); the plurality of upper engaging teeth (17) are evenly distributed in a ring shape, are arranged around the elliptical hole (10), and are arranged one by one in an alternating manner with the lower engaging teeth (16).

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

8. The active spring retraction safety syringe according to claim 1, characterized in that: The lower end of the needle (6) passes through the spring seat (5) downwards and is a sharp part; the spring seat (5) is clearance-matched with the elliptical cavity (11), and a conical protrusion (18) with a larger upper part and a smaller lower part is provided in the middle of the lower side and located in the elliptical hole (10).

9. The active spring retraction safety syringe according to claim 1, characterized in that: 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) 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 arranged obliquely downward from the inside to the outside, and the lower side of the limiting ring (12) is arranged obliquely downward from the inside to the outside.

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