Anti-puncture needle

Abstract

The utility model relates to an anti-stab injection needle, wherein a needle body is fixed in a needle seat, a needle cap is inserted outside the needle seat, a toothed shaft is fixed on the inner and outer outer surfaces of the left end of the needle seat, a shield is installed outside a connecting seat, a connecting seat one-way outer tooth slide rail is provided on the outer surface of the connecting seat, a shield one-way inner tooth slide rail is provided on the inner surface of the shield, an anti-stab cavity shell is provided at the right end of the shield, a limit plate is connected to the lower edge of the inner surface of the shield, the lower end surface of the connecting seat contacts the upper surface of the limit plate, a hanging ear is fixed on the inner and outer outer surfaces of the left end of the connecting seat, a toothed hole is opened at the left end of the hanging ear, and the left end of the hanging ear is installed on the corresponding toothed shaft through the toothed hole. When the utility model is not in use, it can effectively protect the needle body; after use, it avoids the problem of accidental exposure of the head of the needle body and secondary application.

Description

Technical Field

[0001] The utility model relates to an injection needle, and particularly discloses an injection needle that is stabbed-proof. Background Art

[0002] Currently, the structure of injection needles and protective covers is mainly split. After the injection needle is used, the protective cover is discarded, and the needle contaminated by the patient's body fluids is exposed, which can easily cause needle stick accidents to medical staff or medical waste disposal personnel, thereby causing the risk of infection from body fluid-borne diseases.

[0003] Chinese patent 201620855906.6 discloses a needle protection cover connected with an arc-shaped elastic strip. When used for injection, the protection cover is pushed down and fixed to the fixed seat. After the injection, the protection cover is pulled out and the protection cover returns to the needle position under the action of the elastic strip, thereby preventing the risk of needle stick. The structure is relatively simple, but the exposed elastic strip is easily deformed by external forces, causing the position of the protection cover to change, thereby exposing the needle and causing the risk of needle stick.

[0004] Chinese patent 201320500276.7 discloses a needle protection device with a receiver and a spiral tension spring structure. Before injection, the receiver is fixed to the needle seat position, and the needle body extends out of the receiver through the needle hole. After the injection is completed, the receiver is placed in the needle position, and the needle body is located inside the receiver. The top baffle of the receiver pops up under the action of the tension spring to block the needle hole and prevent the needle tip from being exposed. Before injection, the baffle is always in contact with the needle due to the tension spring, which can easily cause deformation of the needle. At the same time, the structure is complex and the cost is high.

[0005] Chinese patent 201520572418.X discloses a puncture-proof injection needle shield structure, which connects the shield to the needle seat through a hinge, and a barb structure is arranged inside the shield. After the shield falls, the barb structure fixes the needle body in the shield, so that the shield cannot be opened again, thereby protecting the needle body and self-destructing. This structure has a large angle between the shield and the needle body before transportation and use, so it occupies a large space, and there is a risk of interference with the needle when assembling the syringe.

[0006] Chinese patent 202023150283.8 discloses a puncture-proof needle shield structure, which connects the shield to the needle seat through a hinge, and a self-destruction structure is arranged inside the shield. After the shield falls, the self-destruction structure deforms the needle body and fixes it in the shield, so that the shield cannot be opened again, thereby protecting the needle body and self-destructing. This structure needs to squeeze the needle body to deform when the shield falls, which requires a lot of force and is inconvenient for medical staff to operate. Utility Model Content

[0007] The utility model aims to overcome the deficiencies in the prior art and provide an anti-stab injection needle which can avoid the problems of accidental exposure of the needle head and secondary application.

[0008] According to the technical solution provided by the utility model, the stab-proof injection needle comprises a needle seat, a toothed shaft, a needle body, a needle cap, a connecting seat, a one-way external tooth slide rail of the connecting seat, a hanging ear, a shield, a one-way internal tooth slide rail of the shield, a stab-proof cavity shell and a limit plate;

[0009] A needle body is fixed in the needle seat, the right end of the needle body extends out of the needle seat, a needle cap is inserted outside the needle seat, the needle cap can completely cover the needle body extending out of the needle seat, and a toothed shaft is fixed on the inner and outer outer surfaces of the left end of the needle seat, and the inner and outer toothed shafts are coaxially arranged;

[0010] The cross sections of the connecting seat and the shield are both U-shaped and their openings are both arranged downwards. The shield is installed outside the connecting seat and they are connected together. The connecting seat and the shield can completely cover the needle cap. The left end of the connecting seat extends out of the left end surface of the shield, and the right end of the shield extends out of the right end surface of the connecting seat.

[0011] A one-way external toothed slide rail of the connecting seat is provided on the outer surface of the right end of the connecting seat, and the one-way external toothed slide rail of the connecting seat is a structure with a right oblique side and a left vertical side; a one-way internal toothed slide rail of the shield is provided on the inner surface of the left end of the shield, and the one-way internal toothed slide rail of the shield is a structure with a left oblique side and a right vertical side, and the one-way internal toothed slide rail of the shield is meshed with the one-way external toothed slide rail of the connecting seat;

[0012] A stab-proof cavity shell is provided at the right end of the shield, and a stab-proof cavity is provided in the stab-proof cavity shell, and the left end of the stab-proof cavity is smaller than the outer size of the right end of the needle cap, and the lower edges of the inner and outer sides of the inner surface of the shield are connected to limit plates, and part of the lower end surface of the connecting seat is in contact with the upper surface of the limit plate;

[0013] A hanging ear is fixed on the inner and outer outer surfaces of the left end of the connecting seat, and a toothed hole is opened at the left end of each hanging ear. The inner and outer toothed holes are coaxially arranged, and the toothed holes cooperate with the toothed shaft. The left end of the hanging ear is installed on the corresponding toothed shaft through the toothed hole.

[0014] Preferably, the stab-proof cavity shell is cylindrical.

[0015] The utility model has the following advantages:

[0016] When the utility model is not in use, the needle cap can completely cover the needle body extending out of the needle seat, and the connecting seat and the shield can completely cover the needle cap, thereby effectively protecting the needle body.

[0017] After use, the protective cover shrinks to the left along the connecting seat, covers the head of the needle body (i.e. the right end) inside the puncture-proof cavity shell, and the toothed slide rail has an anti-reverse sliding structure, thereby avoiding accidental exposure of the head of the needle body and the secondary application problem of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front cross-sectional view of the utility model when not in use.

[0019] Figure 2 It is a top sectional view of the utility model when not in use.

[0020] Figure 3 It is a front cross-sectional view of the utility model after use.

[0021] Figure 4 It is a vertical cross-sectional view of the connection position between the connecting seat and the shield in the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with specific embodiments.

[0023] A stab-proof injection needle, such as Figure 1-4 As shown, it comprises a needle seat 1, a toothed shaft 1.1, a needle body 2, a needle cap 3, a connecting seat 4, a connecting seat one-way external tooth slide rail 4.1, a hanging ear 4.2, a shield 5, a shield one-way internal tooth slide rail 5.1, a puncture-proof cavity shell 5.2 and a limit plate 5.3;

[0024] A needle body 2 is fixed in the needle seat 1, the right end of the needle body 2 extends out of the needle seat 1, a needle cap 3 is inserted outside the needle seat 1, and the needle cap 3 can completely cover the needle body 2 extending out of the needle seat 1, and a toothed shaft 1.1 is fixed on the inner and outer outer surfaces of the left end of the needle seat 1, and the inner and outer toothed shafts 1.1 are coaxially arranged;

[0025] The cross sections of the connecting seat 4 and the shield 5 are both U-shaped and their openings are both arranged downwards. The shield 5 is installed outside the connecting seat 4 and they are connected together. The connecting seat and the shield can completely cover the needle cap. The left end of the connecting seat 4 extends out of the left end surface of the shield 5, and the right end of the shield 5 extends out of the right end surface of the connecting seat 4. The connecting seat 4 and the shield 5 are arranged outside the needle cap 3.

[0026] The right end outer surface of the connecting seat 4 is provided with a connecting seat one-way external tooth slide rail 4.1, which is a right side beveled and left side vertical structure; the left end inner surface of the shield 5 is provided with a shield one-way internal tooth slide rail 5.1, which is a left side beveled and right side vertical structure, and the shield one-way internal tooth slide rail 5.1 is meshed with the connecting seat one-way external tooth slide rail 4.1 to form a one-way toothed slide rail structure;

[0027] A cylindrical stab-proof cavity shell 5.2 is provided at the right end of the shield 5, and a stab-proof cavity is provided in the stab-proof cavity shell 5.2, and the left end of the stab-proof cavity is smaller than the outer size of the right end of the needle cap 3, and the lower edges of the inner and outer sides of the inner surface of the shield 5 are connected to the limit plate 5.3, and part of the lower end surface of the connecting seat 4 is in contact with the upper surface of the limit plate 5.3;

[0028] A lug 4.2 is fixed on the inner and outer outer surfaces of the left end of the connecting seat 4, and a toothed hole is opened at the left end of each lug 4.2. The inner and outer toothed holes are coaxially arranged, and the toothed holes cooperate with the toothed shaft 1.1. The left end of the lug 4.2 is installed on the corresponding toothed shaft 1.1 through the toothed hole.

[0029] In the utility model, the connecting seat 4 and the needle seat 1 are connected to each other through the toothed shaft 1.1 and the toothed hole of the hanging ear 4.2. Under the action of external force, the teeth on the toothed shaft 1.1 undergo plastic deformation, and the connecting seat 4 and the shield 5 can rotate around the toothed shaft 1.1; the shield 5 is circumferentially positioned in the absence of external force to prevent the shield 5 from rotating at will when the medicine is filled and injected.

[0030] In the present invention, since the left end of the puncture-proof cavity is smaller than the outer dimensions of the right end of the needle cap 3, the shield 5 cannot be retracted before the needle cap 3 is removed, thereby preventing the shield 5 from being retracted by mistake and causing the needle body 2 to be unusable.

[0031] In the utility model, a limit plate 5.3 is connected to the lower edge of the inner surface of the shield 5, and part of the lower end surface of the connecting seat 4 contacts the upper surface of the limit plate 5.3, ensuring that the connecting seat 4 and the shield 5 are reliably connected.

[0032] After the injection is completed, the shield 5 is pushed to retract to the left, and the head needle (i.e. the right end) of the needle body 2 is covered in the anti-puncture cavity shell 5.2. The shield 5 cannot be pulled out to the right, thereby preventing the needle from being exposed and achieving self-destruction.

[0033] The above is a detailed introduction to an anti-stab injection needle provided by an embodiment of the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the technical solution disclosed by the utility model; at the same time, for a person skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope, so the content of this specification should not be understood as a limitation of the claims of the utility model.

Claims

1. A stab-proof injection needle, characterized by: It comprises a needle seat (1), a toothed shaft (1.1), a needle body (2), a needle cap (3), a connecting seat (4), a connecting seat one-way external tooth slide rail (4.1), a hanging ear (4.2), a protective cover (5), a protective cover one-way internal tooth slide rail (5.1), a stab-proof cavity shell (5.2) and a limit plate (5.3); A needle body (2) is fixed in the needle seat (1), the right end of the needle body (2) protrudes from the needle seat (1), a needle cap (3) is inserted outside the needle seat (1), the needle cap (3) can completely cover the needle body (2) protruding from the needle seat (1), and a toothed shaft (1.1) is fixed to the inner and outer outer surfaces of the left end of the needle seat (1), and the inner and outer toothed shafts (1.1) are coaxially arranged; The cross-sections of the connecting seat (4) and the shield (5) are both U-shaped and their openings are both arranged downwards. The shield (5) is installed outside the connecting seat (4) and they are connected together. The connecting seat (4) and the shield (5) can completely cover the needle cap (3). The left end of the connecting seat (4) extends out of the left end surface of the shield (5), and the right end of the shield (5) extends out of the right end surface of the connecting seat (4). A connecting seat one-way external tooth slide rail (4.1) is provided on the outer surface of the right end of the connecting seat (4), and the connecting seat one-way external tooth slide rail (4.1) is a structure with a right oblique side and a left vertical side; a shield one-way internal tooth slide rail (5.1) is provided on the inner surface of the left end of the shield (5), and the shield one-way internal tooth slide rail (5.1) is a structure with a left oblique side and a right vertical side, and the shield one-way internal tooth slide rail (5.1) is meshed with the connecting seat one-way external tooth slide rail (4.1); A stab-proof cavity shell (5.2) is provided at the right end of the shield (5), a stab-proof cavity is provided in the stab-proof cavity shell (5.2), and the left end of the stab-proof cavity is smaller than the outer dimensions of the right end of the needle cap (3), and the lower edges of the inner and outer sides of the inner surface of the shield (5) are connected to limit plates (5.3), and a portion of the lower end surface of the connecting seat (4) is in contact with the upper surface of the limit plate (5.3); A lug (4.2) is fixed to the inner and outer outer surfaces of the left end of the connecting seat (4), and a toothed hole is opened at the left end of each lug (4.2). The inner and outer toothed holes are coaxially arranged, and the toothed holes cooperate with the toothed shaft (1.1). The left end of the lug (4.2) is installed on the corresponding toothed shaft (1.1) through the toothed hole.

2. The stab-proof injection needle according to claim 1, characterized in that: The stab-proof cavity shell (5.2) is cylindrical.

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