A safety syringe that automatically rotates and self-destructs

Abstract

The invention discloses an automatic rotating self-destructing safety syringe, which belongs to the technical field of syringes. The syringe comprises a syringe, a core rod, a needle seat and a stop ring, wherein N convex strips 1 are evenly distributed outside the needle seat, a convex strip 2 is arranged on the upper part of the syringe, a locking convex block B is arranged inside the syringe and located at the stop ring, and the convex strip 2 is embedded between two corresponding adjacent convex strips 1 so that the needle seat can only move up and down; a locking block B in an L shape matching with the locking convex is arranged outside the stop ring, and the locking block is hooked on the upper side of the locking convex to fix the stop ring on the syringe; C rotating driving convex blocks are arranged on the tenon, and C rotating guide convex strips matching with the rotating driving convex blocks are arranged inside the stop ring; after the injection is completed, the tenon is inserted into the stop ring, and the rotating driving convex blocks cooperate with the rotating guide convex strips to allow the stop ring to rotate toward the unlocking direction until the locking convex block is staggered with the locking block, and the core rod is locked with the stop ring, and the stop ring and the needle seat can be moved downward by pulling the core rod downward.

Description

Technical Field

[0001] The invention belongs to the technical field of syringes, and in particular relates to a safety syringe that automatically rotates and self-destructs. Background Art

[0002] At present, syringes are one of the most commonly used and most widely used medical devices. In recent years, in order to control nosocomial infectious diseases and avoid adverse consequences such as cross infection, disposable sterile syringes have been widely used. However, existing disposable syringes have defects such as being intact after use and reusable, without any safety devices, and the needle is exposed after injection. On the one hand, it is easy for malicious elements to reuse disposable syringes that have been used and discarded, which can easily cause the spread of viruses and cross infection; on the other hand, the needle is still retained outside after injection. Compared with the sharpness of the needle, it not only brings inconvenience to the transportation and destruction of syringe garbage, but also often causes users to be accidentally stabbed due to the exposed needle tip.

[0003] For example, the patent with application number CN 03128859.6 discloses a self-destructive safety syringe, which consists of a needle, a needle seat, a core rod and a jacket, etc., and is characterized in that a spline groove hole, a convex tooth and a groove are provided on the small bottom cover of the needle seat cavity, and a limiting boss is provided on the convex tooth; a spline tooth is provided in the middle of the needle seat, and a sealing member is embedded in the neck between the spline tooth and the ring. A locking head is provided at the top of the boss of the core rod, which together with the locking mother groove of the inner cavity of the ring forms a locking mechanism, and a protrusion is provided on the side wall of the boss of the core rod to match the spiral groove in the inner cavity. The spline teeth and the limiting boss can firmly fix the needle seat on the jacket. The locking head can be inserted into the locking mother groove and locked together, and the needle seat and the needle can be pulled back into the jacket by pulling back the core rod.

[0004] The aforementioned structure self-destructs through the rotation of the needle seat, but this structure allows the needle to rotate along with the needle seat. If the needle remains in the patient's body, it may cause pain to the patient, resulting in a bad experience. Summary of the invention

[0005] In order to solve the above problems, an embodiment of the present invention provides a safety syringe that automatically rotates and self-destructs. During self-destruction, the core rod and the needle seat will not rotate, but the stop ring will rotate to unlock, ensuring that the needle will not rotate, and the patient experience is good. The technical solution is as follows:

[0006] The embodiment of the present invention provides an automatic rotating self-destructing safety syringe, comprising a syringe 1, a core rod 4, a needle seat 2 at the upper end of the syringe 1, and a stop ring 3 at the lower inner part of the needle seat 2, wherein the upper end of the core rod 4 is coaxially provided with a tenon 4d having an annular protrusion 3 4b, and the stop ring 3 is coaxially provided with a locking protrusion 3d cooperating with the tenon 4d; N convex strips 1 2a are evenly distributed on the outside of the needle seat 2, and A convex strips 2 1b are provided on the upper inner part of the syringe 1, and the convex strips 1 2a and 2 1b are both arranged vertically, and the syringe 1 is located in the inner part of the syringe 1. The stop ring 3 is provided with a B-block locking protrusion 1c, which is evenly distributed in a ring shape and is staggered with the convex strip 1b, A+B=N, the locking protrusion 1c is located below the convex strip 1b, the A-bar convex strip 1b and the B-block locking protrusion 1c constitute N convex structures that evenly divide the inner wall of the syringe 1, the convex structure and the convex strip 2a are staggered one by one, the convex strip 1b is embedded between the corresponding two adjacent convex strips 2a so that the needle seat 2 can only move up and down, and the locking protrusion 1c is located between the corresponding two adjacent convex strips 2a a; the limit ring 3 is provided with a B-block locking block 3a which cooperates with the locking protrusion 1c and is L-shaped, the B-block locking block 3a is evenly distributed in an annular shape and is staggered with the locking protrusion 1c, the locking block 3a is hooked on the upper side of the locking protrusion 1c to fix the limit ring 3 on the syringe 1; C rotation drive protrusions 4a are provided on the tenon 4d and below the annular protrusion 4b, the C rotation drive protrusions 4a are evenly distributed in an annular shape, and the limit ring 3 is provided with C rotation guide protrusions 3b which cooperate with the rotation drive protrusion 4a. The rotation guide ridge 3b is spiral and is staggered with the rotation drive ridge 4a; after the injection is completed, the tenon 4d is inserted into the limit ring 3, and the rotation drive ridge 4a cooperates with the rotation guide ridge 3b to allow the limit ring 3 to rotate in the unlocking direction until the locking ridge 1c is staggered with the locking block 3a. At the same time, the annular protrusion 4b passes upward through the locking ridge 3d to lock the core rod 4 with the limit ring 3. Pulling the core rod 4 downward can make the limit ring 3 and the needle seat 2 move downward, and the needle seat 2 can pass over the locking ridge 1c downward.

[0007] Among them, the width of the locking protrusion 1c in the embodiment of the present invention is smaller than the distance between two adjacent protrusions 2a, and its inner diameter is larger than the outer diameter of the needle seat 2; the outer diameter of the annular protrusion 4b is larger than the inner diameter of the locking protrusion ring 3d, and its outer diameter is smaller than the inner diameter of the rotation guide protrusion 3b.

[0008] Furthermore, the upper outer portion of the limit ring 3 in the embodiment of the present invention is coaxially provided with an annular protrusion 3c, and the lower inner portion of the needle seat 2 is coaxially provided with an annular protrusion 2b that cooperates with the annular protrusion 3c, and the outer diameter of the annular protrusion 3c is larger than the inner diameter of the annular protrusion 2b.

[0009] Specifically, in the embodiment of the present invention, N is 12, A is 8, B is 4, and two convex strips 2a are provided between two adjacent locking protrusions 1c.

[0010] Specifically, the convex strip 1 2a and the convex strip 2 1b in the embodiment of the present invention are both vertically arranged rectangular strips, the upper end of the convex strip 2a is a pointed shape that is small on the top and large on the bottom, and the upper end of the convex strip 2 1b is provided with a limiting portion 1a for limiting the upward movement of the needle seat 2, and the upper end of the convex strip 2a is pressed against the limiting portion 1a for limiting; a sealing ring is provided between the needle seat 2 and the syringe 1, and a sealing ring mounting groove 2c is coaxially provided on the outer lower part of the needle seat 2 and below the convex strip 2a, and the inner side of the sealing ring is located in the sealing ring mounting groove 2c.

[0011] Among them, the limit ring 3 in the embodiment of the present invention includes a limit ring body and a convex ring coaxially arranged on the upper side of the limit ring body, and the locking block 3a is arranged on the outer side of the limit ring body; the convex ring can be inserted into the lower part of the needle seat 2, and an annular protrusion 3c is coaxially arranged on the outer side of its upper end, and a locking convex ring 3d is coaxially arranged on the inner side of its upper end; the limit ring body is a circular ring structure and its inner side is flush with the inner side of the convex ring, and the rotation guide convex strip 3b is arranged on the inner wall of the limit ring body and the convex ring and is spirally arranged from top to bottom in the unlocking direction.

[0012] Specifically, the locking protrusion 1c in the embodiment of the present invention is a vertically arranged rectangular block, which is arranged on the shoulder of the syringe 1, and a corner of its upper side close to the locking block 3a is a rounded corner; the locking block 3a includes a vertically arranged vertical arm and a horizontal arm horizontally arranged at the upper end of the vertical arm, and the vertical arm is located on one side of the corresponding locking block 3a in the unlocking direction; when the limit ring 3 is locked, the horizontal arm rests on the upper side of the locking protrusion 1c.

[0013] Preferably, a place-taking convex ring 4e is coaxially provided on the tenon 4d in the embodiment of the present invention and below the annular protrusion 4b, the rotational driving protrusion 4a is evenly distributed in an annular shape on the outside of the place-taking convex ring 4e, the C is 4, the outer diameter of the place-taking convex ring 4e is smaller than the inner diameter of the rotational guide convex strip 3b and its upper side is a conical surface; the rotational driving protrusion 4a is a vertically arranged rectangular block, the upper end of which is arc-shaped, and the upper end of which is against the lower side of the rotational guide convex strip 3b to drive the limit ring 3 to rotate in the unlocking direction.

[0014] Preferably, a rotation limiter 1d is provided at the bottom of the syringe 1 in the embodiment of the present invention; the rotation limiter 1d is arranged along the radial direction of the syringe 1, the inner end of which is hinged at the bottom of the syringe 1, and the outer end of which is a fork-shaped portion that cooperates with a fin 4c on the core rod 4, and can rotate inwardly and be fixed at the bottom of the syringe 1; when the rotation limiter 1d is rotated inwardly and fixed on the syringe 1, the fork-shaped portion allows an adjacent fin 4c to be embedded so that the core rod 4 can only move up and down, and at this time, the rotation drive protrusion 4a is opposite to the lower side of the corresponding rotation guide protrusion 3b.

[0015] Among them, the rotation limiter 1d in the embodiment of the present invention includes a hinge part and a fork-shaped part arranged in sequence from the inside to the outside, and the end of the hinge part is fixed to the outer lower part of the syringe 1; the hinge part is a rectangular thin sheet; the fork-shaped part is a rectangular sheet, and its outer side is provided with a strip-shaped notch along the radial direction of the syringe 1 to form a fork-shaped part; when the rotation limiter 1d is fixed on the syringe 1, the fork-shaped part is perpendicular to the core rod 4, and the outer end of the corresponding fin 4c is embedded in the strip-shaped notch; a bayonet is provided at the bottom end of the syringe 1 and adjacent to the lower part of the hinged part and the syringe 1, and the fork-shaped part can be embedded in the bayonet; when the rotation limiter 1d rotates inward, the fork-shaped part is embedded in the bayonet to fix the rotation limiter 1d.

[0016] The beneficial effect brought about by the technical solution provided by the embodiment of the present invention is: the embodiment of the present invention provides an automatically rotating self-destructing safety syringe. During self-destruction, neither the core rod nor the needle seat rotates, but the limit ring rotates to unlock, ensuring that the needle does not rotate, and the patient experience is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 2 is a schematic structural diagram of an automatic rotating self-destructing safety syringe in an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the syringe;

[0019] Figure 3 It is a schematic diagram of the structure of the top of the syringe;

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

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

[0022] Figure 6 is a cross-sectional view of the needle seat;

[0023] Figure 7 It is a structural schematic diagram of a combination of a needle seat and a convex strip;

[0024] Figure 8 It is a schematic diagram of the structure of the core rod;

[0025] Fig. 9 It is a schematic diagram of the structure of the limit ring;

[0026] Fig.10 It is a cross-sectional view of the limit ring in one direction;

[0027] Fig.11 is a cross-sectional view of the limit ring in another direction;

[0028] Fig.12 It is a structural schematic diagram of the combination of the syringe and the rotation limiter when the syringe is not locked by the rotation limiter;

[0029] Fig.13 It is a structural schematic diagram of the combination of the syringe and the rotation limiter after the syringe is locked by the rotation limiter;

[0030] Fig.14 It is a structural schematic diagram of the combination of a syringe and a needle seat;

[0031] Fig.15 It is a structural schematic diagram of the combination of the needle cylinder and the limit ring when the limit ring is locked;

[0032] Fig.16 It is a schematic diagram of the structure of the combination of the stop ring and the rotating drive cam when the stop ring is locked;

[0033] Fig.17 1. It is a schematic diagram of the structure of the combination of the needle cylinder and the limit ring when the limit ring is unlocked;

[0034] Fig.18 It is a schematic diagram of the structure of the combination of the limit ring and the rotating drive cam when the limit ring is unlocked.

[0035] In the figure: 1 syringe, 2 needle seat, 3 limit ring, 4 core rod, 5 piston;

[0036] 1a limiting portion, 1b convex strip 2, 1c locking convex block, 1d rotation limiting plate;

[0037] 2a convex strip 1, 2b annular protrusion 2, 2c sealing ring installation groove;

[0038] 3a locking block, 3b rotation guide convex strip, 3c annular protrusion 1, 3d locking convex ring;

[0039] 4a is a rotation driving protrusion, 4b is an annular protrusion, 4c is a fin, 4d is a tenon, and 4e is a position-occupying protrusion. DETAILED DESCRIPTION

[0040] 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.

[0041] See also Figure 1-18The embodiment of the present invention provides an automatic rotating self-destructing safety syringe, comprising a syringe 1 (vertically arranged), a core rod 4 (coaxially arranged in the syringe 1, with a piston 5 coaxially arranged at the top), a needle seat 2 at the upper end of the syringe 1 (capable of moving up and down in the syringe 1, coaxially arranged with the syringe 1) and a stop ring 3 at the lower inner part of the needle seat 2 (also located at the upper inner part of the syringe 1, used to fix the needle seat 2), etc. The upper end of the core rod 4 is coaxially provided with a tenon 4d having an annular protrusion 3 4b, and the stop ring 3 is coaxially provided with a locking protrusion 3d cooperating with the tenon 4d (the annular protrusion 3 4b can pass upward and lock). The above structure is basically the same as the structure of the existing safety syringe, except that:

[0042] In this embodiment, N convex strips 1 2a are evenly distributed outside the needle seat 2, and A convex strip 2 1b is provided at the upper part of the syringe 1. Both convex strips 1 2a and convex strips 2 1b are arranged vertically. B locking protrusions 1c are arranged inside the syringe 1 and located at the stop ring 3. The B locking protrusions 1c are evenly distributed in a ring shape and are staggered with the convex strips 2 1b. A+B=N, A, B and N are all greater than or equal to 2. The locking protrusions 1c are located below the convex strips 2 1b. The A convex strips 2 1b and the B locking protrusions 1c constitute N convex structures that divide the inner wall (inner circumference) of the syringe 1. The convex structures are staggered one by one with the convex strips 1 2a. The convex strips 2 1b are embedded between the corresponding two adjacent convex strips 1 2a so that the needle seat 2 can only move up and down. The locking protrusions 1c are located between the corresponding two adjacent convex strips 1 2a so that the needle seat 2 can go over the locking protrusions 1c downward.

[0043] The limit ring 3 in this embodiment is provided with an L-shaped B-block locking block 3a that cooperates with the locking protrusion 1c. The B-block locking block 3a is evenly distributed in a ring shape and is staggered with the locking protrusion 1c. The locking block 3a is hooked on the upper side of the locking protrusion 1c to fix the limit ring 3 on the syringe 1. C (4 in this embodiment) rotation driving protrusions 4a are arranged on the tenon 4d and below the annular protrusion 4b, where C is greater than or equal to 2; the C rotation driving protrusions 4a are evenly distributed in an annular shape, and C (4 in this embodiment) rotation guiding protrusions 3b are arranged in the limit ring 3 to cooperate with the rotation driving protrusions 4a, and the rotation guiding protrusions 3b are spirally shaped and staggered with the rotation driving protrusions 4a; the spiral direction of the rotation guiding protrusions 3b must cooperate with the locking block 3a to ensure that when the rotation driving protrusion 4a moves upward, it can press on the rotation guiding protrusions 3b and drive the limit ring 3 to rotate in the unlocking direction. After the limit ring 3 rotates in the unlocking direction, the locking protrusion 1c is staggered with the locking block 3a.

[0044] After the injection is completed, the tenon 4d is inserted into the limit ring 3, and the rotation driving protrusion 4a cooperates with the rotation guiding protrusion 3b to rotate the limit ring 3 toward the unlocking direction until the locking protrusion 1c is staggered with the corresponding locking block 3a. At the same time, the annular protrusion 4b passes upward through the locking protrusion 3d to lock the core rod 4 with the limit ring 3. Pulling the core rod 4 downward can make the limit ring 3 and the needle seat 2 move downward, and the needle seat 2 can pass over the locking protrusion 1c downward.

[0045] Among them, the width of the locking protrusion 1c (with an arc surface on the inside) in the embodiment of the present invention is smaller than the distance between two adjacent protrusions 1 2a, and its inner diameter is larger (slightly larger) than the outer diameter of the needle seat 2; the outer diameter of the annular protrusion 3 4b is larger than the inner diameter of the locking protrusion 3d, and its outer diameter is smaller than the inner diameter of the rotation guide protrusion 3b (with an arc surface on the inside) to ensure that the tenon 4d can pass through. The outer diameter of the protrusion 1 2a (with an arc surface on the outside) is slightly smaller than the inner diameter of the syringe 1, and the inner diameter of the protrusion 2 1b (with an arc surface on the inside) is slightly larger than the outer diameter of the needle seat 2, and the width of the protrusion 2 1b is smaller than the distance between two adjacent protrusions 1 2a.

[0046] Further, see Figure 1 , 6 As shown in Figures 9-11, an annular protrusion 3c is coaxially provided on the upper outer portion of the limit ring 3 in the embodiment of the present invention (preferably, the outer outer portion of the upper portion is a conical surface which is smaller at the top and larger at the bottom), and an annular protrusion 2b cooperating with the annular protrusion 3c is coaxially provided on the lower inner portion of the needle seat 2. The outer diameter of the annular protrusion 3c is larger than the inner diameter of the annular protrusion 2b to ensure that the limit ring 3 is fixed to the needle seat 2.

[0047] Specifically, in the embodiment of the present invention, N is 12, A is 8, B is 4, two convex strips 2a are provided between two adjacent locking protrusions 1c, 8 convex strips 1b and 4 locking protrusions 1c are evenly distributed (eg Figure 4 As shown, the angle between adjacent structures is 30° when viewed from bottom to top).

[0048] Specifically, see Figure 5-7 The convex strip 1a and the convex strip 2b in the embodiment of the present invention are both vertically arranged rectangular strips. The upper end of the convex strip 1a is a pointed shape with a small top and a large bottom for easy insertion. The upper end of the convex strip 2b is provided with a limiting portion 1a for limiting the upward movement of the needle seat 2 (specifically, it can be provided between two adjacent convex strips 2b, a total of 4 strips, and perpendicular to the convex strip 2b). The upper end of the convex strip 1a is pressed against the limiting portion 1a for limiting. A sealing ring is provided between the needle seat 2 and the syringe 1 for sealing. A sealing ring installation groove 2c (ring groove) is coaxially provided on the outer lower part of the needle seat 2 and below the convex strip 1a. The inner side of the sealing ring is located in the sealing ring installation groove 2c.

[0049] Among them, see Figure 9-11The stop ring 3 in the embodiment of the present invention includes a stop ring body and a convex ring coaxially arranged on the upper side of the stop ring body, and the locking block 3a is arranged on the outer side (peripheral surface) of the stop ring body. The convex ring can be inserted into the lower inner part of the needle seat 2, and an annular protrusion 3c is coaxially arranged on the outer side of its upper end, and a locking convex ring 3d is coaxially arranged on the inner side of its upper end. The stop ring body is a circular ring structure and its inner side is flush with the inner side of the convex ring. The rotation guide convex strip 3b is arranged on the inner wall of the stop ring body and the convex ring and is spirally arranged from top to bottom in the unlocking direction.

[0050] Specifically, see Figure 2 The locking protrusion 1c in the embodiment of the present invention is a vertically arranged rectangular block, which is arranged on the shoulder of the syringe 1, and a corner of the upper side thereof close to the locking block 3a is rounded to facilitate the rotation of the stop ring 3. The locking block 3a includes a vertically arranged vertical arm and a horizontal arm (located on the same side) arranged horizontally at the upper end of the vertical arm, and the vertical arm is located on one side of the corresponding locking block 3a in the unlocking direction. When the stop ring 3 is locked, the horizontal arm rests on the upper side of the locking protrusion 1c; when the stop ring 3 is unlocked, the horizontal arm moves horizontally to the side of the locking protrusion 1c and is located between the two locking protrusions 1c.

[0051] Preferably, see Figure 8 In the embodiment of the present invention, a place-taking convex ring 4e (annular columnar structure) is coaxially arranged on the tenon 4d and below the annular protrusion 3 4b. The rotation driving convex block 4a is evenly distributed on the outer side (peripheral surface) of the place-taking convex ring 4e in annular shape, C is 4, the outer diameter of the place-taking convex ring 4e is smaller than the inner diameter of the rotation guide convex strip 3b, and its upper side is a conical surface (smaller on the upper side and larger on the lower side, coaxially arranged with the tenon 4d) for easy insertion. The rotation driving convex block 4a is a vertically arranged rectangular block, and its upper end is arc-shaped to facilitate pushing the stop ring 3. Its upper end abuts against the lower side of the corresponding rotation guide convex strip 3b to drive the stop ring 3 to rotate in the unlocking direction; after unlocking, the rotation driving convex block 4a is located between the two rotation guide convex strips 3b.

[0052] Preferably, see Figure 2 and 12 -13, the bottom of the syringe 1 in the embodiment of the present invention is provided with a rotation-limiting plate 1d. The rotation-limiting plate 1d is arranged along the radial direction of the syringe 1, and its inner end (when not rotating, the same below) is hinged to the bottom of the syringe 1, and its outer end is a fork-shaped part that cooperates with a fin 4c on the core rod 4, which can rotate inward and be fixed (through a corresponding structure) to the bottom of the syringe 1. When the rotation-limiting plate 1d rotates inward and is fixed on the syringe 1, the fork-shaped part allows the adjacent fin 4c to be embedded so that the core rod 4 can only move up and down. At this time, the rotation-driving protrusion 4a is directly opposite to the lower side of the corresponding rotation-guiding convex strip 3b to ensure that after the injection is completed, only a slight upward push is required to rotate the stop ring 3 (without rotating the core rod 4 to rotate and find the angle). Accordingly, the rotation-limiting plate 1d is arranged in cooperation with the rotation-guiding convex strip 3b.

[0053] Among them, see Figure 2 and 12 -13, the rotation limiting plate 1d in the embodiment of the present invention includes a hinged portion (arranged along the radial direction of the syringe 1) and a fork-shaped portion (arranged along the radial direction of the syringe 1) arranged in sequence from the inside to the outside, and the end (inner end) of the hinged portion is fixed to the outer lower part of the syringe 1. The hinged portion is a rectangular thin sheet to enable it to rotate; the fork-shaped portion is a rectangular sheet (relatively thick, and reinforcing ribs can be provided as needed), and a strip-shaped notch is provided on its outer side along the radial direction of the syringe 1 to form a fork-shaped portion. The width of the strip-shaped notch is slightly larger than the thickness of the fin 4c. The width of the fork-shaped portion is larger than the width of the hinged portion (the midline of the fork-shaped portion coincides with that of the hinged portion). When the rotation limiting plate 1d is fixed on the syringe 1, the fork-shaped portion is perpendicular to the core rod 4, and the corresponding outer end of the fin 4c is embedded in the strip-shaped notch. A bayonet is provided at the bottom of the syringe 1 and adjacent to the lower part where the hinged part and the syringe 1 are hinged. The bayonet is arranged along the radial direction of the syringe 1 and is a dovetail groove with a smaller bottom (slightly smaller in width than the width of the fork-shaped part to ensure clamping) and a larger top. The fork-shaped part can be inserted into the bayonet. When the rotation-limiting piece 1d rotates inward, the fork-shaped part is inserted into the bayonet to fix the rotation-limiting piece 1d. Of course, other fixing methods can be used between the rotation-limiting piece 1d and the syringe 1, such as a combination of a socket and a latch, a clamping structure, a locking structure, etc., which will not be described in detail in this embodiment.

[0054] 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 automatic rotating self-destructing safety syringe, comprising a syringe (1), a core rod (4), a needle seat (2) at the upper end of the syringe (1), and a stop ring (3) at the lower inner part of the needle seat (2), wherein the upper end of the core rod (4) is coaxially provided with a tenon (4d) having an annular protrusion (4b), and the stop ring (3) is coaxially provided with a locking protrusion (3d) cooperating with the tenon (4d); characterized in that: The needle seat (2) is provided with N convex strips (2a) evenly distributed outside, the upper part of the inner part of the syringe (1) is provided with A convex strip (1b), the convex strips (2a) and (1b) are both arranged vertically, and the syringe (1) is provided with B locking protrusions (1c) located at the stop ring (3), the B locking protrusions (1c) are evenly distributed in a ring shape and are arranged alternately with the convex strip (1b), A+B=N, the locking protrusions (1c) are arranged in a ring shape, and ... c) located below the convex strip 2 (1b), the convex strip 2 (1b) of strip A and the locking convex block (1c) of block B constitute N convex structures that evenly divide the inner wall of the syringe (1), the convex structures and the convex strip 1 (2a) are arranged one by one in an alternating manner, the convex strip 2 (1b) is embedded between the corresponding two adjacent convex strips 1 (2a) so that the needle seat (2) can only move up and down, and the locking convex block (1c) is located between the corresponding two adjacent convex strips 1 (2a); The stop ring (3) is provided with an L-shaped B-block locking block (3a) that cooperates with the locking protrusion (1c). The B-block locking blocks (3a) are evenly distributed in a ring shape and are staggered with the locking protrusion (1c). The locking blocks (3a) are hooked on the upper side of the locking protrusion (1c) to fix the stop ring (3) on the syringe (1); C rotational drive protrusions (4a) are arranged on the tenon (4d) and below the annular protrusion (4b), the C rotational drive protrusions (4a) are evenly distributed in an annular shape, and C rotational guide protrusions (3b) cooperating with the rotational drive protrusions (4a) are arranged in the stop ring (3), the rotational guide protrusions (3b) are spiral-shaped and are arranged alternately with the rotational drive protrusions (4a); After the injection is completed, the tenon (4d) is inserted into the stop ring (3), and the rotation driving protrusion (4a) cooperates with the rotation guiding protrusion (3b) to rotate the stop ring (3) in the unlocking direction until the locking protrusion (1c) and the locking block (3a) are offset. At the same time, the annular protrusion (4b) passes through the locking protrusion (3d) upward to lock the core rod (4) and the stop ring (3). The core rod (4) is pulled downward to move the stop ring (3) and the needle seat (2) downward, and the needle seat (2) can pass over the locking protrusion (1c) downward.

2. The automatic rotating self-destructing safety syringe according to claim 1, characterized in that: The width of the locking protrusion (1c) is smaller than the distance between two adjacent protrusions (2a), and its inner diameter is larger than the outer diameter of the needle seat (2); the outer diameter of the annular protrusion (4b) is larger than the inner diameter of the locking protrusion (3d), and its outer diameter is smaller than the inner diameter of the rotation guide protrusion (3b).

3. The automatic rotating self-destructing safety syringe according to claim 1, characterized in that: The upper outer portion of the stop ring (3) is coaxially provided with an annular protrusion 1 (3c), and the lower inner portion of the needle seat (2) is coaxially provided with an annular protrusion 2 (2b) that cooperates with the annular protrusion 1 (3c), and the outer diameter of the annular protrusion 1 (3c) is greater than the inner diameter of the annular protrusion 2 (2b).

4. The automatic rotating self-destructing safety syringe according to claim 1, characterized in that: The N is 12, the A is 8, the B is 4, and two convex strips (2a) are provided between two adjacent locking convex blocks (1c).

5. The automatic rotating self-destructing safety syringe according to claim 4, characterized in that: The convex strip 1 (2a) and the convex strip 2 (1b) are both vertically arranged rectangular strips, the upper end of the convex strip 1 (2a) is a pointed shape with a small upper part and a large lower part, the upper end of the convex strip 2 (1b) is provided with a limiting portion (1a) for limiting the upward movement of the needle seat (2), and the upper end of the convex strip 1 (2a) is pressed against the limiting portion (1a) for limiting the position; a sealing ring is provided between the needle seat (2) and the syringe (1), and a sealing ring installation groove (2c) is coaxially provided on the outer lower part of the needle seat (2) and below the convex strip 1 (2a), and the inner side of the sealing ring is located in the sealing ring installation groove (2c).

6. The automatic rotating self-destructing safety syringe according to claim 3, characterized in that: The stop ring (3) comprises a stop ring body and a convex ring coaxially arranged on the upper side of the stop ring body, and the locking block (3a) is arranged on the outer side of the stop ring body; the convex ring can be inserted into the lower part of the needle seat (2), and an annular protrusion (3c) is coaxially arranged on the outer side of its upper end, and a locking convex ring (3d) is coaxially arranged on the inner side of its upper end; the stop ring body is a circular ring structure and its inner side is flush with the inner side of the convex ring, and the rotation guide convex strip (3b) is arranged on the inner wall of the stop ring body and the convex ring and is spirally arranged from top to bottom in the unlocking direction.

7. The automatic rotating self-destructing safety syringe according to claim 6, characterized in that: The locking protrusion (1c) is a vertically arranged rectangular block, which is arranged on the shoulder of the syringe (1), and a corner of its upper side close to the locking block (3a) is rounded; the locking block (3a) includes a vertical arm arranged vertically and a horizontal arm arranged horizontally at the upper end of the vertical arm, and the vertical arm is located on one side of the corresponding locking block (3a) in the unlocking direction; when the limit ring (3) is locked, the horizontal arm presses against the upper side of the locking protrusion (1c).

8. The automatic rotating self-destructing safety syringe according to claim 1, characterized in that: A place-taking convex ring (4e) is coaxially arranged on the tenon (4d) and below the annular protrusion three (4b); the rotation driving convex block (4a) is evenly distributed in an annular shape on the outside of the place-taking convex ring (4e); C is 4; the outer diameter of the place-taking convex ring (4e) is smaller than the inner diameter of the rotation guiding convex strip (3b) and the upper side thereof is a conical surface; the rotation driving convex block (4a) is a vertically arranged rectangular block, the upper end of which is arc-shaped and abuts against the lower side of the rotation guiding convex strip (3b) to drive the limit ring (3) to rotate in the unlocking direction.

9. The automatic rotating self-destructing safety syringe according to claim 1, characterized in that: A rotation limiting plate (1d) is provided at the bottom of the needle cylinder (1); the rotation limiting plate (1d) is arranged along the radial direction of the needle cylinder (1), the inner end of which is hinged to the bottom of the needle cylinder (1), and the outer end of which is a fork-shaped portion that cooperates with a fin (4c) on the core rod (4), and can rotate inwardly and be fixed to the bottom of the needle cylinder (1); when the rotation limiting plate (1d) is rotated inwardly and fixed on the needle cylinder (1), the fork-shaped portion allows the adjacent fin (4c) to be embedded so that the core rod (4) can only move up and down, and at this time, the rotation driving protrusion (4a) is directly opposite to the lower side of the corresponding rotation guiding protrusion (3b).

10. The automatic rotating self-destructing safety syringe according to claim 9, characterized in that: The rotation-limiting plate (1d) comprises a hinged portion and a fork-shaped portion which are arranged in sequence from the inside to the outside, and the end of the hinged portion is fixed to the outer lower part of the syringe (1); the hinged portion is a rectangular thin plate; the fork-shaped portion is a rectangular plate, and a strip-shaped notch is provided on the outer side of the fork-shaped portion along the radial direction of the syringe (1) to form a fork-shaped portion; when the rotation-limiting plate (1d) is fixed on the syringe (1), the fork-shaped portion is perpendicular to the core rod (4), and the outer end of the corresponding fin (4c) is embedded in the strip-shaped notch; a bayonet is provided at the bottom end of the syringe (1) and adjacent to and below the hinged portion of the hinged portion and the syringe (1), and the fork-shaped portion can be embedded in the bayonet; when the rotation-limiting plate (1d) rotates inwardly, the fork-shaped portion is embedded in the bayonet to fix the rotation-limiting plate (1d).

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