Self-locking injector

Abstract

The utility model discloses a self-locking injector, and belongs to the technical field of medical instruments. The defects that in the prior art, when a traditional injector sucks, a push rod needs to be fixed through external force, and stable negative pressure cannot be generated are overcome. A main body structure of the syringe comprises a syringe main body, a connector is installed at one end of the syringe main body, a push rod is installed in the other end of the syringe main body, a locking mechanism used for locking the push rod is arranged at the end of the syringe main body and comprises a locking switch base and a locking switch, and the locking switch base is installed on the outer surface of the syringe main body. The locking switch is installed on the locking switch base and connected with the locking switch base through a shaft, and a second limiting protrusion on the locking switch protrudes out of the inner wall of the injector body. The utility model is mainly used for suction application.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a self-locking syringe. Background Art

[0002] Syringes in the field of conventional medical devices consist of a syringe body, a piston and a push rod. Injection and aspiration can be accomplished by pushing and retracting the push rod in the syringe body. For some aspiration applications, such as aspirating blood clots in blood vessels, the push rod needs to be retracted to a suitable or maximum capacity position of the syringe body and fixed to generate a suitable or maximum negative pressure to aspirate blood clots or other fluids that need to be aspirated and drained to achieve the purpose of treatment.

[0003] However, in the application of suction, the existing syringes cannot automatically lock the push rod on the syringe body, and the push rod and the syringe body can only be fixed manually. However, it is difficult to stabilize the push rod manually, and stable negative pressure cannot be generated, which affects the suction effect. In addition, some syringe push rods are fixed with tooling. Although the push rod can be locked on the syringe body to generate stable negative pressure, the tooling needs to be fixed and removed before and after suction, which is more cumbersome in operation and takes longer to prepare. Especially for some patients with acute embolism, multiple suctions are required. Therefore, it is necessary to quickly prepare the syringe to aspirate the thrombus that causes embolism, and the shorter the time, the better.

[0004] For example, the Chinese utility model patent with authorization announcement number CN218870976 U discloses a knob-type self-locking syringe, which, after the push rod is pulled out to a predetermined position, pushes the push block with the thumb, and then rotates the knob plate toward the push rod until the knob plate is embedded in the positioning groove on the side of the push rod, thereby completing the locking of the push rod, thereby forming a stable negative pressure environment in the syringe barrel, allowing the doctor to free one hand for subsequent operations. When the push rod is to be pulled out again, the thumb only needs to push the push block in the opposite direction to disengage the knob plate from the positioning groove, and the push rod can be pulled out again, thereby achieving the purpose of flexible locking of the push rod, stable negative pressure and simple operation. By installing a limit block on the side of the knob plate away from the positioning column, the knob plate can be prevented from crossing the positioning groove; but its disadvantages are that: there is no hinge point when the knob plate rotates toward the push rod, and the knob plate is prone to breakage after long-term rotation, and the steering is stuck, affecting the locking time. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a self-locking syringe.

[0006] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0007] A self-locking syringe, comprising a syringe body, with a connector installed at one end of the syringe body and a push rod installed inside the other end. A locking mechanism for locking the push rod is provided at the end of the syringe body. The locking mechanism includes a locking switch seat and a locking switch. The locking switch seat is installed on the outer surface of the syringe body, the locking switch is installed on the locking switch seat, the locking switch is connected to the locking switch seat through a shaft, and the second limit protrusion on the locking switch protrudes from the inner wall of the syringe body; a first limit protrusion is provided on the locking switch seat, and the first limit protrusion protrudes from the inner wall of the syringe body.

[0008] Preferably, a spring is provided between the pressing inclined surface on the locking switch and the locking switch seat.

[0009] Preferably, the push rod includes a cross rib plate and a sector card installed on the cross rib plate, and at least one sector card is provided.

[0010] Preferably, the height h of the first limit protrusion ranges from 0.2 to 10 millimeters, the thickness t ranges from 0.2 to 10 millimeters, and the width k ranges from 0.2 to 10 millimeters.

[0011] Preferably, the height H of the second limit protrusion ranges from 0.2 to 10 millimeters, the thickness T ranges from 0.2 to 10 millimeters, and the width K ranges from 0.2 to 10 millimeters.

[0012] Preferably, a connector sealing ring is provided at one end of the connector.

[0013] Preferably, a push rod sealing ring is provided between the piston on the push rod and the inner wall of the syringe body.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. By providing a locking mechanism for locking the push rod at the end of the syringe body, when the push rod is retracted, the locking switch and the limit protrusions on the locking switch seat can cooperate with the sector cards on the push rod to limit the axial displacement of the push rod, and the push rod can be automatically self-locked to generate a stable negative pressure to meet the suction requirements;

[0016] 2. The push rod can be freely advanced forward by rotating the sector cards on the push rod until the gap between the sector cards aligns with the second limit protrusion on the locking switch, completing the unlocking; another unlocking method is to press down the locking switch on the pressing inclined surface at the spring position until it contacts the locking switch seat. At this time, the second limit protrusion on the locking switch can be lifted and reset by the spring, achieving the purpose of rapid unlocking, which is more convenient in operation and has a shorter preparation time;

[0017] 3. The connector seal ring provided on the connector and the piston rod seal ring between the piston on the piston rod and the inner wall of the syringe body can effectively prevent liquid leakage, enhance the overall sealing performance of the syringe, and ensure hygiene and safety during use;

[0018] 4. By specifying the size ranges of the first limiting protrusion and the second limiting protrusion, the self-locking syringe can be flexibly adjusted according to different application scenarios and requirements, improving the applicability and market competitiveness of the product;

[0019] In summary, the present utility model not only improves the safety and accuracy of medical operations, but also generates a stable negative pressure without relying on manpower or tooling to achieve the purpose of aspiration therapy. Moreover, it is more convenient to operate, has a shorter preparation time, improves the user's operation experience, and has significant practical value and market potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the front view of the present utility model;

[0021] Figure 2 is the top view of the present utility model;

[0022] Figure 3 is the internal schematic diagram of the present utility model;

[0023] Figure 4 is the structural schematic diagram of the present utility model;

[0024] Figure 5 is the structural schematic diagram when the piston rod is assembled with the locking switch seat and the locking switch in the present utility model;

[0025] Figure 6 is the structural schematic diagram of the piston rod in the present utility model;

[0026] Figure 7 is Figure 6 the sectional view taken along A-A in

[0027] Figure 8 is the front view of the locking switch in the present utility model;

[0028] Figure 9 is the left view of the locking switch in the present utility model;

[0029] Figure 10 is the front view of the locking switch seat in the present utility model;

[0030] Figure 11 is the left view of the locking switch seat in the present utility model.

[0031] In the figure: 1, joint sealing ring; 2, joint; 3, syringe body; 4, locking switch base; 5, spring; 6, shaft; 7, locking switch; 8, push rod; 9, push rod sealing ring; 41, first limit projection; 71, pressing inclined surface; 72, second limit projection; 73, chamfer; 81, sector card; 82, cross rib plate. Detailed implementation mode

[0032] The present utility model will be further described below through specific embodiments in conjunction with the drawings.

[0033] Embodiment 1:

[0034] As Figures 1 - 5 shown, a self-locking syringe includes a syringe body 3, a joint 2 is installed at one end of the syringe body 3, a push rod 8 is installed inside the other end, and a locking mechanism for locking the push rod 8 is arranged at the end of the syringe body 3. The locking mechanism includes a locking switch base 4 and a locking switch 7. The locking switch base 4 is installed on the outer surface of the syringe body 3, the locking switch 7 is installed on the locking switch base 4, the locking switch 7 is hinged to the locking switch base 4 through a shaft 6, and the second limit projection 72 on the locking switch 7 protrudes from the inner wall of the syringe body 3. A first limit projection 41 is arranged on the locking switch base 4, and the first limit projection 41 protrudes from the inner wall of the syringe body 3.

[0035] Embodiment 2:

[0036] A self-locking syringe, which is different from Embodiment 1 in that a spring 5 is arranged between the pressing inclined surface 71 on the locking switch 7 and the locking switch base 4. Specifically, the locking switch 7 and the locking switch base 4 are connected through a shaft 6. The locking switch 7 has a pressing inclined surface 71, and a spring 5 with a suitable compression amount is arranged between the pressing inclined surface 71 and the locking switch base 4. After pressing the locking switch 7 through the pressing inclined surface 71, it can be reset. The positions of the locking switch 7 and the locking switch base 4 can be set at the maximum capacity position of the syringe body 3, or at any position on the syringe body 3. One or more locking switches 7 and locking switch bases 4 can be arranged on the syringe body 3. Among them, the materials of the locking switch 7 and the locking switch base 4 are high-molecular or metal materials with a certain strength.

[0037] As Figures 6 - 7 shown, the push rod 8 includes a cross rib plate 82 and a sector card 81 installed on the cross rib plate 82. The sector card 81 is arranged perpendicular to the central axis on the push rod 8, and at least one sector card 81 is arranged. Specifically, the overall material of the push rod 8 is a high-molecular material with a certain strength. Among them, the diameter of the sector card 81 is 5 to 40 millimeters, the central angle θ of the sector card 81 is 5 to 355 degrees, and the thickness of the sector card 81 is 0.2 to 5 millimeters.

[0038] AsFigures 8 - 11 As shown, the height h of the first limiting projection 41 ranges from 0.2 to 10 millimeters, the thickness t ranges from 0.2 to 10 millimeters, and the width k ranges from 0.2 to 10 millimeters. The height H of the second limiting projection 72 ranges from 0.2 to 10 millimeters, the thickness T ranges from 0.2 to 10 millimeters, and the width K ranges from 0.2 to 10 millimeters.

[0039] Specifically, the second limiting projection 72 of the locking switch 7 in the retraction direction of the push rod 8 has an oblique angle of 5° to 85° or a chamfer 73 with a radius of 0.2 to 10 millimeters, and the other direction is a 90° limiting surface parallel to the plane of the sector card 81. Both directions of the locking switch seat 4 are 90° limiting surfaces parallel to the plane of the sector card 81, without an oblique angle or chamfer. The second limiting projection 72 on the locking switch 7 is integrally formed or distributed in multiple individuals in the axial direction of the syringe body 3, and the first limiting projection 41 on the locking switch seat 4 is distributed in at least two halves or multiple individuals in the axial direction of the syringe body 3. The projected shape of the locking switch 7 and the locking switch seat 4 in the axial direction of the syringe body 3 can be square, circular, or any other geometric shape. When the push rod 8 retracts, the sector card 81 can directly slide past the second limiting projection 72 in the direction of the oblique angle or chamfer 73 of the locking switch 7, but cannot slide past the first limiting projection 41 on the locking switch seat 4. After the push rod 8 is automatically self-locked, it will be restricted by the 90° limiting surfaces of the projections of the locking switch 7 and the locking switch seat 4 whether it is pushed forward or retracted backward.

[0040] Furthermore, a joint seal ring 1 is provided at one end of the joint 2, and a push rod seal ring 9 is provided between the piston on the push rod 8 and the inner wall of the syringe body 3. The joint seal ring 1 provided on the joint 2 and the push rod seal ring 9 between the piston on the push rod 8 and the inner wall of the syringe body 3 can effectively prevent liquid leakage, enhance the overall sealing performance of the syringe, and ensure hygiene and safety during use.

[0041] The working principle of the present utility model is as follows:

[0042] During clinical operation, align the sector card 81 on the push rod 8 with the locking switch 7 on the syringe body 3, retract the push rod 8 until the sector card 81 slides past the locking switch 7 and contacts the raised limiting surface and stops. At this time, the sector card 81 of the push rod 8 is between the raised limiting surfaces of the locking switch 7 and the locking switch seat 4, as Figure 5As shown, the push rod 8 is automatically locked on the syringe body 3 to meet the clinical use requirements. If unlocking is required, the sector cards 81 on the push rod 8 can be rotated until the notch between the sector cards 81 aligns with the second limit protrusion 72 on the locking switch 7, and then the push rod 8 can be freely pushed forward to complete the unlocking. Another unlocking method is to press down the locking switch 7 on the pressing slope 71 at the position of the spring 5 until it contacts the locking switch seat 4. At this time, the second limit protrusion 72 on the locking switch 7 can be lifted and reset by the spring 5 to achieve the purpose of quick unlocking.

Claims

1. A self-locking syringe, comprising a syringe body (3), a connector (2) being mounted on one end of the syringe body (3) and a push rod (8) being mounted inside the other end, characterized in that: A locking mechanism for locking the push rod (8) is provided at the end of the syringe body (3), the locking mechanism comprising a locking switch seat (4) and a locking switch (7), the locking switch seat (4) being mounted on the outer surface of the syringe body (3), the locking switch (7) being connected to the locking switch seat (4) via a shaft (6), and a second limiting protrusion (72) on the locking switch (7) protruding from the inner wall of the syringe body (3); and a first limiting protrusion (41) is provided on the locking switch seat (4), and the first limiting protrusion (41) protruding from the inner wall of the syringe body (3).

2. The self-locking syringe according to claim 1, characterized in that: A spring (5) is provided between the pressing inclined surface (71) on the locking switch (7) and the locking switch seat (4).

3. The self-locking syringe according to claim 2, characterized in that: The push rod (8) comprises a cross-rib plate (82) and a sector-shaped card (81) mounted on the cross-rib plate (82), and at least one sector-shaped card (81) is provided.

4. The self-locking syringe according to any one of claims 1 to 3, characterized in that: The height h of the first limiting protrusion (41) is in the range of 0.2 to 10 millimeters, the thickness t is in the range of 0.2 to 10 millimeters, and the width k is in the range of 0.2 to 10 millimeters.

5. The self-locking syringe according to claim 4, characterized in that: The height H of the second limiting protrusion (72) is in the range of 0.2 to 10 millimeters, the thickness T is in the range of 0.2 to 10 millimeters, and the width K is in the range of 0.2 to 10 millimeters.

6. The self-locking syringe according to any one of claims 1 to 3, characterized in that: A joint sealing ring (1) is provided at one end of the joint (2).

7. The self-locking syringe according to any one of claims 1 to 3, characterized in that: A push rod sealing ring (9) is provided between the piston on the push rod (8) and the inner wall of the syringe body (3).

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