Self-destructive syringe with controllable injection dosage

Abstract

The utility model discloses a self-destructive syringe with controllable injection dosage, which relates to the technical field of medical beauty medical instruments and comprises a syringe, an injection rod and a positioning cover, a flange is fixed on the upper portion of the syringe, and a boss is integrally formed in the lower portion of the syringe. The upper half section of the injection rod is provided with a threaded section, the upper end is fixedly provided with a handle, and the lower end is fixedly provided with a stress-deformable piston through a snapping structure; the positioning cover is provided with a positioning groove, a positioning column and an inner threaded hole, and the positioning cover is connected to the threaded section of the injection rod through the inner threaded hole. According to the injector, the spiral injection structure and the self-destruction structure with the separable piston are designed, the injection dosage of each time can be accurately controlled through the spiral injection structure according to the characteristics of each injection part, and the piston and the injection rod can be separated through the self-destruction structure with the separable piston after injection is completed so that rapid self-destruction can be achieved. The technical problems that an existing syringe cannot accurately control the injection dosage in multiple times and is complex in self-destruction structure are solved.

Description

Technical Field

[0001] This utility model relates to the field of medical aesthetic devices, specifically to a self-destructing syringe with controllable injection dosage. Background Technology

[0002] A syringe is a device that can inject drugs or other liquids into the human body. A syringe mainly consists of a syringe barrel, piston, syringe rod, needle, etc., and is designed with different capacities, such as 10 ml, 20 ml, 60 ml, etc. By selecting a syringe with different capacities, the required drug dose can be accurately injected into the human body in one go.

[0003] In the cosmetic medicine industry, after doctors draw medication into a syringe, they need to accurately control the injection dosage at each site based on the characteristics of the injection site. This means the medication in the same syringe needs to be injected accurately at each site in multiple doses. For example, when performing Botox injections, strict control of the injection dosage at each site is required. However, existing syringes can only achieve accurate injection of a single dose, and cannot control the accurate dosage of each part in multiple injections. This not only makes it inconvenient for doctors to operate, but also easily leads to safety issues.

[0004] Furthermore, while existing syringes are all single-use, reuse is still sometimes observed. To address this, existing technologies have incorporated self-destruct mechanisms into syringes. For example, patent document CN201510612U discloses a safe self-destructing syringe, which includes a syringe barrel, a core rod inside the barrel, and a piston seat at the front end of the core rod. A piston body is fitted onto the piston seat. The core rod has several conical steps arranged sequentially along the axial direction, with the larger ends of these steps facing the front end of the core rod. A locking element located at the rear end of the syringe barrel is fitted around the core rod and can move unidirectionally forward along the syringe barrel when the core rod moves axially. A connecting structure is provided between the core rod and the piston seat, which can be broken when the locking element moves to the front end of the syringe barrel and the piston seat abuts against the locking element. However, careful analysis reveals that the self-destruct mechanism of this syringe is quite complex, relying on the locking element and several conical steps on the core rod. This not only makes the self-destruction operation less intuitive and convenient but also lacks measures to ensure stability during injection. The addition of metal parts to the syringe necessitates more complex manufacturing processes and assembly steps, resulting in higher production costs.

[0005] Therefore, it is necessary to provide a new syringe that can both facilitate accurate control of the injection dosage and enable rapid self-destruction to solve the above-mentioned technical problems. Utility Model Content

[0006] To overcome the aforementioned technical problems in the prior art, this invention provides a self-destructing syringe with controllable injection dosage. The syringe is designed with a helical injection structure and a self-destructing structure with a separable piston. The helical injection structure allows for accurate control of the injection dosage each time according to the characteristics of each injection site. The self-destructing structure with a separable piston allows the piston to separate from the injection rod and self-destruct quickly after injection. Thus, the syringe has the advantages of accurate injection of small doses and easy self-destruction, solving the technical problems of existing syringes that cannot accurately control the injection dosage in multiple injections and have complex self-destructing structures.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A self-destructing syringe with controllable injection dosage, comprising:

[0009] The syringe has a flange fixed at the upper part and a boss integrally formed at the lower part near the needle tip, which is adapted to the inner surface of the syringe. The cross-section of the boss is a right-angled triangle.

[0010] The injection rod has a threaded section in the upper half and a handle fixed at the upper end. The lower end is fixed with a force-deformable piston through a pull-off structure. When the piston is subjected to a downward force, it can be deformed and moved to the bottom of the boss. When the piston is located below the boss and subjected to an upward force, the pull-off structure cooperates with the boss to disconnect the piston from the injection rod.

[0011] The positioning cover has a positioning groove for the flange to engage, a positioning post for the syringe barrel to extend into, and an internal threaded hole through the positioning post. The positioning cover is connected to the threaded section of the injection rod through the internal threaded hole. When the flange engages in the positioning groove, the injection dose can be controlled by rotating the handle.

[0012] The pull-out structure includes an annular retaining seat, a limiting member, an annular protrusion, and an abutment ring. The annular retaining seat is fixed to the upper end of the piston. The outer diameter of the annular retaining seat is smaller than the outer diameter of the piston, and multiple slots are formed around the annular retaining seat. The lower ends of the limiting members are movably connected to the slots, and the upper ends of the limiting members are fixed with positioning protrusions. The weight of the lower end of the limiting member is less than the weight of the upper end. The upper end of the limiting member can automatically tilt outward and protrude outside the annular retaining seat without external force. The annular protrusion is integrally formed at the lower end of the injection rod. The middle part of the abutment ring has an annular groove that matches the annular protrusion. The abutment ring is secured to the injection rod through the annular groove and the annular protrusion. The lower surface of the abutment ring has a positioning hole that matches the positioning protrusion. The abutment ring and the annular retaining seat are connected by the positioning protrusion engaging the positioning hole.

[0013] The cross-section of the limiting member is triangular.

[0014] The upper surface of the annular holder is connected to the lower end of the injection rod by adhesive.

[0015] The upper surface of the annular holder is connected to the lower end of the injection rod by a thin post.

[0016] The boss includes a side right-angled surface, a lower right-angled surface, and a beveled surface. The side right-angled surface is fixed to the inner wall of the syringe, the lower right-angled surface is perpendicular to the inner wall of the syringe, and the upper side of the beveled surface smoothly transitions to the inner wall of the syringe.

[0017] The inclination angle of the inclined surface is 3-10 degrees.

[0018] The boss is an arc-shaped structure adapted to the inner wall of the syringe.

[0019] The number of protrusions is 1-5, and when the number of protrusions is greater than 1, the protrusions are arranged in a ring and evenly distributed.

[0020] The distance between the boss and the lower end face of the injection cylinder is greater than the sum of the heights of the piston and the annular retainer.

[0021] The advantages of using this utility model are:

[0022] 1. Precision of drug dosage control: This solution is designed with a spiral injection structure in which the positioning cap and the end flange of the syringe are engaged for positioning, and the injection rod is rotated by the handle for injection. In actual use, the injection dosage is fixed for each rotation of the handle, thus achieving accurate control of the dosage for each injection. This is especially suitable for the medical aesthetics industry, where drugs from the same syringe are accurately injected into various parts of the body multiple times, which not only ensures the accuracy of the injection but also improves the safety of the industry.

[0023] 2. Simplified self-destruct mechanism and reduced cost: This solution incorporates a specific pull-off structure between the piston and the injection rod. When the piston is subjected to a downward force, it can deform and move below the boss. Therefore, under the restraining effect of the boss on the limiting component and the abutment ring, only an upward pull on the injection rod is needed to disconnect the piston from the injection rod, thereby achieving rapid self-destruction. This not only improves the safety of the syringe and avoids reuse, but also simplifies the self-destruction structure and reduces production costs.

[0024] 3. Production costs and ease of assembly: This solution reduces production costs and facilitates assembly, which has a significant impact on large-scale production and cost reduction.

[0025] 4. Production flexibility: The connection method between the injection rod and the ring holder, such as glue spot connection or thin column connection, provides flexibility for production. This flexibility helps to adapt to different production needs and conditions, and plays a positive role in improving production efficiency and adapting to market changes. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the injection rod in this utility model;

[0028] Figure 3 This is a three-dimensional structural diagram of the injection cylinder in this utility model;

[0029] Figure 4 This is a schematic diagram of the assembly structure of the tensile fracture structure in this utility model;

[0030] Figure 5 This is a three-dimensional structural diagram of the annular card holder in this utility model.

[0031] The markings in the diagram are as follows: 1. Injection barrel, 2. Boss, 3. Injection rod, 4. Threaded section, 5. Handle, 6. Break-off structure, 7. Positioning cap, 8. Positioning post, 9. Flange, 10. Annular seat, 11. Piston, 12. Positioning hole, 13. Limiting element, 14. Abutment ring, 15. Annular protrusion, 16. Annular groove. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0033] like Figure 1-3 As shown, this utility model provides a self-destructing syringe with controllable injection dosage, comprising:

[0034] The syringe 1 has a symmetrical flange 9 fixed at its upper part and a needle fixed at its lower end. The lower part of the syringe 1 has a boss 2 integrally formed near the needle, which is adapted to the inner surface of the syringe 1. The cross-section of the boss 2 is a right-angled triangle structure.

[0035] The injection rod 3 has a threaded section 4 in its upper half, a handle 5 fixed to its upper end, and a break-off structure 6 at its lower end. A deformable piston 11 is fixed to the break-off structure 6. When the piston 11 is subjected to a downward force, it can deform and move below the boss 2, allowing all the medication in the syringe 1 to be injected. When the piston 11 is below the boss 2 and subjected to an upward force, the boss 2 will limit the break-off structure 6. At this time, the piston 11 can be disconnected from the injection rod 3 through the cooperation of the break-off structure 6 and the boss 2, thus achieving self-destruction.

[0036] The positioning cover 7 has a positioning groove for the flange 9 to engage, a positioning post 8 for the syringe barrel 1 to extend into, and an internal threaded hole through the positioning post 8. The positioning cover 7 is connected to the threaded section 4 of the injection rod 3 through the internal threaded hole. The shape of the positioning groove is adapted to the shape of the flange 9. When the flange 9 engages in the positioning groove, the positioning groove is positioned and cannot rotate. The positioning post 8 is located in the middle of the positioning groove. When the flange 9 engages in the positioning groove, the positioning post 8 also extends into the syringe barrel 1. After the flange 9 engages in the positioning groove, the injection dose can be controlled by rotating the handle 5, thereby enabling the drug in the syringe barrel 1 to be accurately injected into various parts in multiple doses.

[0037] In a specific embodiment, such as Figure 4-5 As shown, the pull-off structure 6 includes an annular retaining seat 10, a limiting member 13, an annular protrusion 15, and an abutment ring 14. The annular retaining seat 10 is fixed to the upper end of the piston 11 by adhesive. The outer diameter of the annular retaining seat 10 is smaller than the outer diameter of the piston 11, and multiple slots are evenly distributed around the annular retaining seat 10, for example, 4-6 slots. The limiting member 13 has a triangular cross-section. The lower end of the limiting member 13 is movably connected to the slot, and the upper end of the limiting member 13 is fixed with a positioning protrusion. The weight of the lower end of the limiting member 13 is less than the weight of the upper end. The upper end of the limiting member 13 can automatically tilt outward and protrude outside the annular retaining seat 10 without the action of external force. An annular protrusion 15 is integrally formed on the lower end of the injection rod 3. The outer diameter of the abutment ring 14 is the same as the outer diameter of the piston 11. An annular groove 16 adapted to the annular protrusion 15 is provided in the middle of the abutment ring 14. The abutment ring 14 can be secured to the injection rod 3 through the annular groove 16 and the annular protrusion 15. In addition, a positioning hole 12 adapted to the positioning protrusion is also provided on the lower surface of the abutment ring 14. The abutment ring 14 and the annular retainer 10 are connected by the positioning protrusion engaging the positioning hole 12. At this time, the piston 11 is indirectly fixed to the lower end of the injection rod 3. When the abutment ring 14 is subjected to force and disengages from the annular protrusion 15 under the action of the boss 2, the positioning hole 12 will separate from the positioning protrusion, and the piston 11 will break away from the injection rod 3 and self-destruct.

[0038] In this embodiment, the upper surface of the limiting member 13 is flush with the upper surface of the annular card holder 10, and the positioning protrusion protrudes from the upper surface of the limiting member 13. The cross-section of the limiting member 13 is approximately an inverted isosceles triangle, and its lower end can be movably connected to the lower end of the card slot via a pin. Because the positioning protrusion is at the upper end of the limiting member 13, the limiting member 13 forms a top-heavy structure. Therefore, without the action of external force, the upper end of the limiting member 13 will automatically tilt outward, or the upper end of the limiting member 13 can be automatically tilted outward by slightly tilting the injection rod 3. Alternatively, the structure in which the upper end of the limiting member 13 can automatically tilt outward can also be achieved by setting a plastic elastic element in the card slot.

[0039] In one specific embodiment, the upper surface of the annular retainer 10 is connected to the lower end of the injection rod 3 by adhesive spot bonding, or as... Figure 4 As shown, the upper surface of the annular retainer 10 is securely connected to the lower end of the injection rod 3 via a thin post and a fine hole. This structure results in a smaller connecting force between the injection rod 3 and the annular retainer 10, preventing the piston 11 from detaching from the injection rod 3 during normal use, thus ensuring the connection stability between the injection rod 3 and the piston 11 during use.

[0040] In this embodiment, when the piston 11 is located below the boss 2, the annular seat 10 and the limiting member 13 are both located below the boss 2. The limiting member 13 is in an outward tilted state. The limiting member 13 is restricted by the boss 2 and cannot move upward. Correspondingly, the piston 11 and the annular seat 10 are also restricted and cannot move upward. At this time, it is only necessary to pull the injection rod 3 upward with force to disconnect the connection between the injection rod 3 and the annular seat 10, so that the syringe can self-destruct.

[0041] In one specific embodiment, the number of protrusions 2 is 1-5. When the number of protrusions 2 is 1, the protrusion 2 has a certain length. For example, the length of the protrusion 2 can be 1 / 4 or 1 / 2 of the inner diameter of the injection cylinder 1. When the number of protrusions 2 is greater than 1, there is a gap between each protrusion 2, and each protrusion 2 is arranged in a ring and uniformly distributed.

[0042] In this embodiment, the boss 2 includes a side right-angled surface, a lower right-angled surface, and a beveled surface. The side right-angled surface is an arc-shaped structure adapted to the inner wall of the syringe 1 and is fixed to the inner wall of the syringe 1. The lower right-angled surface is perpendicular to the inner wall of the syringe 1. The beveled surface has an inclination angle of 3-10 degrees, specifically 5 degrees. In addition, the upper side of the beveled surface smoothly transitions to the inner wall of the syringe 1, so that the piston 11 can move smoothly and easily under the boss 2.

[0043] In one specific embodiment, the distance between the boss 2 and the lower end face of the syringe 1 is slightly greater than the sum of the heights of the piston 11 and the annular seat 10, so that when the piston 11 is below the boss 2, the drug in the syringe 1 is just injected.

[0044] Those skilled in the art will understand that this syringe can be configured to dispense 0.1-5 ml of drug by rotating the injection rod 3 one revolution according to different needs, thereby achieving accurate control of the drug injection dosage.

[0045] Taking the need to inject the medication in this syringe into 10 different sites as an example, the implementation principle of this utility model is as follows:

[0046] After inhaling the medication and expelling the air, first rotate the positioning cap 7 until it covers the flange 9. Then insert the needle into the first injection site, keeping the syringe 1 stationary, and rotate the injection rod 3 via the handle 5. With the help of the threaded structure, the piston 11 moves downward (towards the needle tip), thereby injecting the medication into the body. This process can be repeated to complete the injection of other parts. Since the injection dose per rotation of the handle 5 is predetermined, the number of rotations of the handle 5 can be controlled according to the required injection dose, thus achieving accurate injection.

[0047] As the piston 11 moves downward under force, the boss 2 squeezes and deforms the piston 11. As the piston 11 continues to move downward, the boss 2 blocks the abutment ring 14. As the injection rod 3 continues to rotate, the annular groove 16 on the abutment ring 14 will disengage from the annular protrusion 15. Consequently, the positioning hole 12 separates from the positioning protrusion. When the annular retainer 10 moves below the boss 2, the limiting member 13 on the annular retainer 10 is released from restraint and will automatically tilt outward to form a jamming structure with the boss 2. At this time, if the injection rod 3 is pulled upward with force, the annular retainer 10 will disengage from the injection rod 3, thus completing the self-destruction of the syringe.

[0048] In summary, this invention enables the accurate injection of medication from the same syringe into various sites multiple times, achieving precise control of the injection dosage. Furthermore, after injection, simply pulling the injection rod 3 upwards disconnects the piston 11 from the injection rod 3, achieving rapid self-destruction. It boasts advantages such as high safety and strong practicality.

[0049] The above description is only a specific embodiment of the present utility model. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in all methods or processes disclosed may be combined in any way except for mutually exclusive features and / or steps.

Claims

1. A self-destructing syringe with controllable injection dosage, characterized in that... include: The upper part of the injection cylinder (1) is fixed with a flange (9), and the lower part near the needle tip is integrally formed with a boss (2) that matches the inner surface of the injection cylinder (1). The cross-section of the boss (2) is a right-angled triangle structure. The injection rod (3) has a threaded section (4) on its upper half. The upper end of the injection rod (3) is fixed with a handle (5), and the lower end is fixed with a force-deformable piston (11) through a pull-off structure (6). When the piston (11) is subjected to a downward force, it can be moved to the lower part of the boss (2) by deformation. When the piston (11) is located below the boss (2) and subjected to an upward force, the pull-off structure (6) and the boss (2) can cooperate to disconnect the piston (11) from the injection rod (3). The positioning cover (7) is provided with a positioning groove for the flange (9) to be inserted, a positioning post (8) for the syringe (1) to be inserted, and an internal threaded hole through the positioning post (8). The positioning cover (7) is connected to the threaded section (4) of the injection rod (3) through the internal threaded hole. When the flange (9) is inserted into the positioning groove, the injection dose can be controlled by rotating the handle (5).

2. The self-destructing syringe with controllable injection dosage according to claim 1, characterized in that: The pull-off structure (6) includes an annular retainer (10), a limiting member (13), an annular protrusion (15), and an abutment ring (14). The annular retainer (10) is fixed to the upper end of the piston (11). The outer diameter of the annular retainer (10) is smaller than the outer diameter of the piston (11), and multiple slots are provided around the annular retainer (10). The lower ends of the limiting members (13) are movably connected to the slots. The upper end of the limiting members (13) is fixed with a positioning protrusion. The weight of the lower end of the limiting members (13) is less than the weight of the upper end. The upper end of the limiting members (13) is free from external force. Under the action, it can automatically tilt outward and protrude outward to the annular card seat (10); the annular protrusion (15) is integrally formed on the lower end of the injection rod (3), and the middle part of the abutment ring (14) is provided with an annular groove (16) that matches the annular protrusion (15). The abutment ring (14) is fixed on the injection rod (3) through the annular groove (16) and the annular protrusion (15); the lower surface of the abutment ring (14) is provided with a positioning hole (12) that matches the positioning protrusion. The abutment ring (14) and the annular card seat (10) are connected by the positioning protrusion being inserted into the positioning hole (12).

3. A self-destructing syringe with controllable injection dosage according to claim 2, characterized in that: The cross-section of the limiting member (13) is triangular.

4. A self-destructing syringe with controllable injection dosage according to claim 2, characterized in that: The upper surface of the annular card holder (10) is connected to the lower end of the injection rod (3) by adhesive.

5. A self-destructing syringe with controllable injection dosage according to claim 2, characterized in that: The upper surface of the annular card holder (10) is connected to the lower end of the injection rod (3) by a thin column.

6. A self-destructing syringe with controllable injection dosage according to any one of claims 1-5, characterized in that: The boss (2) includes a side right angle surface, a lower right angle surface and a hypotenuse surface. The side right angle surface is fixed on the inner wall of the injection cylinder (1), the lower right angle surface is perpendicular to the inner wall of the injection cylinder (1), and the upper side of the hypotenuse surface smoothly transitions to the inner wall of the injection cylinder (1).

7. A self-destructing syringe with controllable injection dosage according to claim 6, characterized in that: The inclination angle of the inclined surface is 3-10 degrees.

8. A self-destructing syringe with controllable injection dosage according to claim 6, characterized in that: The boss (2) is an arc-shaped structure that fits the inner wall of the injection cylinder (1).

9. A self-destructing syringe with controllable injection dosage according to claim 6, characterized in that: The number of protrusions (2) is 1-5, and when the number of protrusions (2) is greater than 1, the protrusions (2) are arranged in a ring and evenly distributed.

10. A self-destructing syringe with controllable injection dosage according to claim 2, characterized in that: The distance between the boss (2) and the lower end face of the injection cylinder (1) is greater than the sum of the heights of the piston (11) and the annular seat (10).

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