A needle-stick-proof auxiliary injection device

Abstract

The present invention discloses an anti-needle-stick auxiliary injection device, which specifically relates to the technical field of medical devices. The present invention comprises a hollow outer sheath, a front sheath is fixed inside one side of the outer sheath, a syringe barrel is slidably installed inside the front sheath, an injection needle is installed in the middle of the outlet end of the syringe barrel, and a trigger sleeve is slidably connected inside the other side of the outer sheath; the syringe is loaded into the device after the medicine is prepared, and the injection needle is used to pierce the skin first, and then the injection is performed, which is divided into two stages to ensure the stability of the injection, automatically pierce the injection needle, and rotate the trigger component to trigger, and the core rod is pushed by the push seat to automatically inject the medicine with uniform force, thereby reducing the patient's fear of needle sticks; a starting protection component is provided, and when the safety cover is located in the safety groove, it is prevented that the injection spring rebounds and drives the injection needle to pierce the skin after the trigger cover is accidentally touched; and after the safety cover slides from the safety groove to the activation groove, it is convenient to start the trigger sleeve, thereby realizing normal piercing.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to an anti-needle puncture type auxiliary injection device. Background Art

[0002] Medical syringes are an indispensable medical device in the medical field. They are widely used in medication, blood collection and other operations. They are mainly composed of a syringe with a small hole at the front end and a matching piston core rod. The syringe is used to hold liquid medicine, and the piston core rod is pushed back and forth to inhale and discharge the liquid medicine. It is also equipped with a needle that is tightly connected to the syringe to inject liquid medicine into the body or extract liquid from the body.

[0003] In the existing scheme, the syringe mainly relies on manpower to directly penetrate the skin, and then applies thrust to push the core rod to inject the drug. However, the external force of each push is different, and the injection force cannot be uniform or stable. At the same time, the injection process cannot be accurately controlled, which can easily cause the needle to bend or break, causing discomfort to the patient. Therefore, for liquid medicines with requirements for injection volume and injection force, direct manual non-professional injection is not possible. In addition, many polymer liquid medicines now need to be directly and professionally dispensed in hospitals or pharmaceutical factories, and patients cannot directly dispense and inject them. This requires a disposable auxiliary injection device that has been dispensed to facilitate injection and transportation and storage. Summary of the invention

[0004] The object of the present invention is to provide an anti-needle-stick auxiliary injection device to solve the problems mentioned in the above background technology.

[0005] Unlike the prefilled syringes used in conventional auxiliary injections, this device uses ordinary syringes, which can be loaded into the device after the medicine is prepared in the hospital. Conventional ones need to be filled directly in the pharmaceutical factory. In addition, the injection process is carried out in stages, with puncture first and then injection. After the injection, the safety device is activated and the device cannot be used a second time.

[0006] The present invention can be implemented by the following technical scheme: an anti-needle-stick auxiliary injection device, comprising a hollow outer sheath, a front sheath is fixed inside one side of the outer sheath, a syringe barrel is slidably installed inside the front sheath, an injection needle is installed in the middle of the outlet end of the syringe barrel, a trigger sleeve is slidably connected inside the other side of the outer sheath, a sheath 1 is installed inside the trigger sleeve, a connecting seat is fixed at one end of the sheath 1, and a rotating trigger component for pushing the core rod to move is arranged inside the sheath 1, and a start protection component is arranged on the outer surface of the outer sheath;

[0007] The startup protection assembly includes a safety sleeve, a safety wedge seat is mounted on the surface of the safety sleeve, a vertical through groove is provided on the top surface of the safety wedge seat, and a transverse through groove is provided on the inner bottom surface of the safety wedge seat, a wedge block is provided inside the transverse through groove, an inclined portion is provided in the middle of the bottom surface of the wedge block, and a groove and a slide groove for the wedge block to slide into are provided on the end surface of the trigger sleeve;

[0008] The start protection component also includes an activation groove and a safety groove arranged on the outer surface of the outer sheath.

[0009] A further technical improvement of the present invention is that a wedge seat groove is provided inside the safety condom, a clamping block that is clamped with the inner wall of the wedge seat groove is provided on one side of the safety wedge seat, a notch is provided at the bottom end of the safety wedge seat, the notch is located outside the outer sheath, and an installation groove for the safety wedge seat to enter is provided on the outer surface of the outer sheath.

[0010] A further technical improvement of the present invention is that: a second sheath is sleeved on the outside of the syringe barrel, a docking seat sliding in the groove is installed on the inner wall surface of the outer sheath, an injection spring is installed between the docking seat and the end of the second sheath, the end of the second sheath is clamped with a connecting seat, the inner cavity of the connecting seat is in contact with the syringe barrel, and a contact piece in contact with the inclined portion is provided on the end surface of the trigger sleeve.

[0011] A further technical improvement of the present invention is that: a core rod is slidably mounted inside the syringe barrel, a push plug that slides inside the syringe barrel is fixedly mounted on one side of the core rod, and a plug seat is clamped at the end of the sheath;

[0012] The rotary trigger assembly includes a push seat in contact with the end of the core rod, a ring seat is rotatably arranged on the middle outer surface of the push seat, and a core rod spring is installed between the push seat and the blocking seat, a rebound pin is installed on the outer surface of the ring seat, and the surface of the sleeve is provided with an L-shaped groove that slides with the rebound pin, and the L-shaped groove includes a clamping end and a straight end, a circular groove hole is provided on the outer surface of the trigger sleeve, and a straight groove is provided on one side of the circular groove, and a trigger pin that abuts against the rebound pin is slidably clamped inside the straight groove.

[0013] A further technical improvement of the present invention is that a plug for sealing the syringe barrel is arranged on one side of the interior of the front sheath, a sealing rubber plug is sleeved on the exterior of the injection needle, and a protective cap used in conjunction with the sealing rubber plug is sleeved on one side of the outer sheath.

[0014] A further technical improvement of the present invention is that: a transposition anti-secondary use component is provided on the front sheath, and the transposition anti-secondary use component comprises a compression spring sleeved on the outside of the front sheath and a guide sleeve slidably sleeved on the front sheath, and the end of the compression spring is connected to a transposition ring, and two inclined blocks are symmetrically provided on the surface of the transposition ring, and two elastic clamping blocks are installed on the inner wall surface of the transposition ring;

[0015] The end surface of the guide sleeve is provided with an inclined block 1 which is in close contact with the corresponding inclined block 2, and the outer surface of the guide sleeve is provided with a clamping groove which slides with the guide block. The outer surface of the front sleeve is provided with a plurality of guide blocks for the guide sleeve to slide through. The outer surface of the front sleeve is provided with two guide grooves, and the end surface of the guide groove is provided with a clamping groove for the corresponding elastic clamping block to be clamped in.

[0016] A further technical improvement of the present invention is that the method for using the injection device comprises the following steps:

[0017] Step 1: First, remove the protective cap and push the safety cover to slide from the safety slot to the activation slot position;

[0018] Step 2: After aligning the injection needle with the injection skin, press the trigger sleeve to slide inside the outer sheath, then the injection spring is activated, and the syringe barrel drives the injection needle to pierce the skin;

[0019] Step 3: When the syringe barrel fits with the plug in the front sheath, the trigger pin and the rebound pin are in contact, causing the rotary trigger assembly to rotate, and the core rod spring is triggered to rebound from the tensioned state, pushing the core rod to slide in the syringe barrel, completing the injection of the liquid medicine;

[0020] Step 4. After the injection is completed, press the guide sleeve to slide in a directional manner on the front sleeve. Under the abutment contact between the inclined block 1 and the inclined block 2, the transposition ring rotates and then stops pressing the guide sleeve. Under the rebound force of the compression spring, the transposition ring is driven to slide in the guide groove until the elastic block enters the positioning groove. After the transposition ring is locked, the guide sleeve is tightly pressed against the surface of multiple guide blocks.

[0021] A further technical improvement of the present invention is that: in step one, the condom is inserted into the safety groove as the initial position, and the wedge block is now located inside the transverse through groove to prevent the syringe barrel from being triggered; when the condom slides into the activation groove, the safety is released, and the wedge block is now located at a position where the transverse through groove communicates with the vertical through groove.

[0022] A further technical improvement of the present invention is that in step two, the end of the trigger sleeve abuts against the inclined portion, causing the wedge block to rise and enter the interior of the vertical through groove. Since the second sleeve, the syringe barrel and the connecting seat are clamped together, the injection spring rebounds and pushes the second sleeve and the first sleeve to move together, completing the insertion of the injection needle.

[0023] A further technical improvement of the present invention is that in step three, the trigger pin is installed through the circular groove hole, and when the trigger sleeve is pressed, the trigger pin slides in the straight groove and abuts against the rebound pin, and the rebound pin drives the ring seat to rotate on the outer surface of the push seat. At this time, the rebound pin moves from the clamping end of the L-shaped groove to the straight end, triggering the core rod spring to rebound, and after rebound, the push seat pushes the core rod for injection.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. After the medicine is prepared, it is loaded into the device. The injection needle is used to pierce the skin first, and then the injection is performed in two stages to ensure the stability of the injection. When piercing and injecting, first aim at the skin, slide the start protection component, press the trigger sleeve, automatically pierce the injection needle, rotate the trigger component to trigger, and the push seat pushes the core rod to automatically inject the medicine. The piercing and injection forces are uniform, which reduces the patient's fear of needle sticks;

[0026] 2. By setting the start protection component, when the condom is in the safety slot, the contact piece and the second protective sleeve interfere with the wedge block in motion, preventing the injection needle from piercing the skin due to the rebound of the injection spring after the trigger sleeve is accidentally touched; and after the condom slides from the safety slot to the activation slot, it is convenient to start the trigger sleeve, so as to achieve normal insertion;

[0027] 3. By setting a rotating trigger assembly, the trigger pin slides in the straight groove and contacts with the rebound pin. After the rebound pin is subjected to the abutment thrust, it drives the ring seat to rotate on the outer surface of the push seat. At this time, the rebound pin moves from the clamping end of the L-shaped groove to the straight end, and the core rod spring is triggered to rebound from the tensioned state. After rebounding, the push seat pushes the core rod to inject, pushing the core rod to slide in the syringe barrel to complete the injection of the liquid medicine;

[0028] 4. By setting a transposition anti-secondary use component, the guide sleeve is pressed, and the guide sleeve slides in a directional manner on the front sleeve until the inclined block 1 contacts the inclined block 2, so that the transposition ring rotates, the angle of the elastic block is changed, and the pressing thrust on the guide sleeve is stopped. The transposition ring is driven to slide in the guide groove under the rebound elastic force of the compression spring. At this time, the elastic block is stuck in the positioning groove. After the transposition ring is stuck, the guide sleeve is tightly pressed against the surface of multiple guide blocks. It cannot be directly removed after injection, and the injection needle is surrounded in the guide sleeve to prevent secondary use and reduce the risk of infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0030] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 2It is a schematic diagram of the three-dimensional explosion structure of the present invention;

[0032] Figure 3 It is a schematic diagram of a three-dimensional explosion structure from another angle of the present invention;

[0033] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A;

[0034] Figure 5 It is a schematic diagram of the three-dimensional disassembled structure of the guide sleeve and the front sleeve of the present invention;

[0035] Figure 6 It is a three-dimensional cross-sectional view of the present invention in a non-injected state;

[0036] Figure 7 It is a three-dimensional cross-sectional view of the present invention in the injection state;

[0037] Figure 8 for Figure 6 A partial enlarged view of point B in the middle;

[0038] Fig. 9 It is a partial three-dimensional cross-sectional view of the injection needle of the present invention when it is not inserted;

[0039] Fig.10 It is a three-dimensional structural schematic diagram of the safety wedge seat and the wedge block of the present invention;

[0040] Fig.11 It is a schematic diagram of the three-dimensional installation structure of the L-shaped groove of the present invention;

[0041] Fig.12 It is a partial three-dimensional cross-sectional view of the present invention in a non-injected state.

[0042] In the figure: 1, outer sheath; 2, insurance cover; 3, insurance wedge seat; 4, wedge block; 5, trigger sleeve; 6, protective cap; 7, front sheath; 8, guide sleeve; 9, sheath one; 10, injection spring; 11, connecting seat; 12, L-shaped groove; 13, ring seat; 14, rebound pin; 15, round slot hole; 16, straight slot; 17, trigger pin; 18, contact piece; 19, activation slot; 20, insurance slot; 21, installation slot; 22, push seat; 23 , sheath two; 24, core rod spring; 25, oblique block one; 26, guide block; 27, compression spring; 28, transposition ring; 29, oblique block two; 30, guide groove; 31, positioning groove; 32, elastic block; 33, injection needle; 34, core rod; 35, push plug; 36, syringe barrel; 37, vertical through groove; 38, horizontal through groove; 39, inclined part; 40, docking seat; 41, vacant part; 42, wedge seat groove; 43, clamping block. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0044] See also Figure 1-Figure 12 As shown, the present invention provides an anti-needle-stick auxiliary injection device, comprising a hollow outer sheath 1, a front sheath 7 is fixed inside one side of the outer sheath 1, a syringe barrel 36 is slidably installed inside the front sheath 7, an injection needle 33 is installed in the middle of the outlet end of the syringe barrel 36, a trigger sleeve 5 is slidably connected inside the other side of the outer sheath 1, the syringe barrel 36 slides in the front sheath 7 by pressing the trigger sleeve 5, a sheath 9 is installed inside the trigger sleeve 5, a connecting seat 11 is fixed at one end of the sheath 9, and a start protection component is provided on the outer surface of the outer sheath 1;

[0045] The start protection assembly includes a safety sleeve 2, a safety wedge seat 3 is mounted on the surface of the safety sleeve 2, a vertical through groove 37 is provided on the top surface of the safety wedge seat 3, and a transverse through groove 38 is provided on the inner bottom surface of the safety wedge seat 3, a wedge block 4 is provided inside the transverse through groove 38, an inclined portion 39 is provided in the middle of the bottom surface of the wedge block 4, and a groove and a slide groove for the wedge block 4 to slide into are provided on the end surface of the trigger sleeve 5;

[0046] The start protection assembly also includes an activation groove 19 and a safety groove 20 provided on the outer surface of the outer sheath 1. When the safety sheath 2 is located in the safety groove 20, Fig. 9 As shown, the wedge block 4 is located in the transverse groove 38, and the sheath 23 is blocked by the wedge block 4 to prevent the injection spring 10 from rebounding and causing the syringe barrel 36 to be accidentally triggered; and after the safety condom 2 slides from the safety groove 20 to the activation groove 19, as shown in FIG. Figure 8 As shown, the wedge block 4 is now located at a position where the transverse through groove 38 communicates with the vertical through groove 37, and is still in a blocking state for the sheath 23. By applying a thrust to the trigger sleeve 5, the injection needle 33 connected to the syringe barrel 36 can be normally triggered to penetrate the skin.

[0047] See also Figure 8 and Fig.10 As shown, a wedge seat groove 42 is provided inside the insurance condom 2, and a clamping block 43 is provided on one side of the insurance wedge seat 3 to be clamped with the inner wall surface of the wedge seat groove 42. Since the clamping block 43 has a tendency to open outward, the insurance wedge seat 3 is always in a clamped state after being installed in the wedge seat groove 42. A vacant portion 41 is provided at the bottom end of the insurance wedge seat 3, and the vacant portion 41 is located outside the outer sheath 1. The outer surface of the outer sheath 1 is provided with a mounting groove 21 for the insurance wedge seat 3 to enter. Since the insurance wedge seat 3 is clamped in the wedge seat groove 42, it will not fall off. When the insurance condom 2 slides from the insurance groove 20 to the activation groove 19, the side of the clamping block 43 is in contact with the mounting groove 21. Figure 8 As shown, the provision of the vacant portion 41 enables the safety wedge seat 3 to slide normally outside the outer sheath 1 .

[0048] See also Figure 3 , Figure 8 and Fig.12 As shown, the outer part of the syringe barrel 36 is sleeved with the second sheath 23, the inner wall surface of the outer sheath 1 is installed with a docking seat 40 that slides in the slot, an injection spring 10 is installed between the docking seat 40 and the end of the second sheath 23, the end of the second sheath 23 is clamped with the connecting seat 11, the inner cavity of the connecting seat 11 is in contact with the end of the syringe barrel 36, and the end surface of the trigger sleeve 5 is provided with a contact piece 18 that contacts the inclined portion 39. Initially, the syringe barrel 36 is used for dispensing and then loaded into the outer sheath 1. The loaded syringe barrel 36 cannot be removed to prevent secondary use. Fig. 9 As shown, the wedge block 4 blocks one end of the sheath 23. When the condom 2 slides to the activation groove 19, the wedge block 4 is located below the inner cavity of the vertical through groove 37. Then the trigger sleeve 5 is pressed, and one end of the trigger sleeve 5 slides inside the outer sheath 1. The trigger sleeve 5 drives the contact piece 18 to move together, and the contact piece 18 abuts against the inclined portion 39, so that the wedge block 4 rises and enters above the inner cavity of the vertical through groove 37. At this time, the injection spring 10 is started, pushing the sheath 23 together with the sheath 1 9 to move. Since the connecting seat 11 is connected to the syringe barrel 36 and the sheath 23, under the pushback force of the injection spring 10, the injection needle 33 on the syringe barrel 36 is automatically inserted into the injection depth of the skin, and the insertion force is uniform, which reduces the patient's fear of needle pricks. The parameters of the injection spring 10 are adjusted and replaced according to different injection liquids to meet different injection application scenarios.

[0049] See also Figure 6 , Figure 7 , Fig.11 and Fig.12 As shown, a core rod 34 is slidably mounted inside the syringe barrel 36, a push plug 35 is fixedly mounted on one side of the core rod 34 and slides inside the syringe barrel 36, a rotating trigger assembly for pushing the core rod 34 to move is arranged inside the sheath 9, and a plug seat is clamped at the end of the sheath 9;

[0050] The rotary trigger assembly includes a push seat 22 that contacts the end of the core rod 34, a ring seat 13 is rotatably provided on the middle outer surface of the push seat 22, and a core rod spring 24 is installed between the push seat 22 and the blocking seat, and a rebound pin 14 is installed on the outer surface of the ring seat 13. The surface of the sheath 9 is provided with an L-shaped groove 12 that slides with the rebound pin 14. The L-shaped groove 12 includes a clamping end and a straight end. A circular groove hole 15 is provided on the outer surface of the trigger sleeve 5, and a straight groove 16 is provided on one side of the circular groove hole 15. The inner sliding clamp of the straight groove 16 is provided with a trigger pin 17 that abuts against the rebound pin 14. When the trigger sleeve 5 is pushed, the sheath 23 is pushed forward by the rebound of the injection spring 10. The trigger pin 17 is limited in the straight groove 16 and slides until the trigger pin 17 contacts the rebound pin 14. The rebound pin 14 squeezes and drives the ring seat 13 to rotate outside the push seat 22. The end of the rebound pin 14 moves from the clamping end of the L-shaped groove 12 to the straight end, and the core rod spring 24 rebounds and starts, pushing the push seat 22 and the core rod 34 for automatic injection of the drug. The rebound pin 14 is limited in the straight end of the L-shaped groove 12 and slides to ensure the stability of the push seat 22 in sliding. The injection needle 33 first pierces the skin, and then injects, which is carried out in two stages to ensure the possibility of injection.

[0051] See also Figure 6 As shown, a plug is provided inside the front sheath 7 for sealing one end of the syringe barrel 36, a sealing rubber plug is sleeved on the outside of the injection needle 33, and a protective cap 6 used in conjunction with the sealing rubber plug is sleeved on the outside of one side of the outer sheath 1. The needle tip of the injection needle 33 is sealed and protected by the sealing rubber plug, and one end of the syringe barrel 36 is sealed by the plug.

[0052] See also Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a transposition anti-secondary use component is provided on the front sheath 7, and the transposition anti-secondary use component includes a compression spring 27 sleeved on the outside of the front sheath 7 and a guide sleeve 8 slidably sleeved on the front sheath 7, and the end of the compression spring 27 is connected to a transposition ring 28, and two inclined blocks 29 are symmetrically provided on the surface of the transposition ring 28, and two elastic clamping blocks 32 are installed on the inner wall surface of the transposition ring 28; an inclined block 1 25 is provided on the end surface of the guide sleeve 8 for fitting and contacting with the corresponding inclined block 29, and a clamping groove slidably matched with the guide block 26 is provided on the outer surface of the guide sleeve 8, and a plurality of guide blocks 26 for the guide sleeve 8 to slide through are provided on the outer surface of the front sheath 7, and two guide grooves 30 are provided on the outer surface of the front sheath 7, and the end surface of the guide groove 30 is provided with The locking groove 31 is used to correspond to the elastic locking block 32. When the injection needle 33 finishes injecting the drug, the injection needle 33 is pulled out from the skin, and then the guiding sleeve 8 is pressed. Due to the limitation of multiple guide blocks 26, the guiding sleeve 8 now slides directionally on the front sheath 7 until the contact between the inclined block 1 25 and the inclined block 2 29, so that the transposition ring 28 rotates, changes the angle of the elastic locking block 32, stops the pressing thrust on the guiding sleeve 8, and drives the transposition ring 28 to slide in the guide groove 30 under the rebound elastic force of the compression spring 27. At this time, the elastic locking block 32 enters the locking groove 31. After the transposition ring 28 is stuck, the guiding sleeve 8 is tightly pressed against the surface of multiple guide blocks 26, and cannot be directly removed after injection, thereby preventing secondary use and reducing the risk of infection.

[0053] The use method and working principle of the needle stick-proof auxiliary injection device of the present invention are as follows: first, remove the protective cap 6, push the condom 2 to slide from the safety groove 20 to the position of the activation groove 19, initially, the wedge block 4 is located inside the transverse groove 38 to prevent the syringe barrel 36 from being triggered, and when the condom 2 slides into the activation groove 19, the safety is released, and at this time, the wedge block 4 is located at a position where the transverse groove 38 communicates with the vertical groove 37;

[0054] After the injection needle 33 is aligned with the injection skin, the trigger sleeve 5 is pressed to slide inside the outer sheath 1, and the end of the trigger sleeve 5 abuts against the inclined portion 39, so that the wedge block 4 rises and enters the interior of the vertical through groove 37. Since the sheath 23, the syringe barrel 36 and the connecting seat 11 are clamped together, the injection spring 10 is activated at this time, and the injection spring 10 rebounds to push the sheath 23 and the sheath 1 9 to move together, and the syringe barrel 36 drives the injection needle 33 to pierce the skin;

[0055] The syringe barrel 36 fits with the plug in the front sheath 7. When the trigger sleeve 5 is pressed, the trigger pin 17 slides in the straight groove 16 and contacts the rebound pin 14. The rebound pin 14 drives the ring seat 13 to rotate on the outer surface of the push seat 22. At this time, the rebound pin 14 moves from the clamping end of the L-shaped groove 12 to the straight end. The core rod spring 24 is triggered to rebound from the tensioned state. After rebounding, the push seat 22 pushes the core rod 34 to inject, pushing the core rod 34 to slide in the syringe barrel 36 to complete the injection of the liquid medicine.

[0056] After the injection is completed, the guide sleeve 8 is pressed to slide in a directional manner on the front sleeve 7. Under the abutment contact between the inclined block 1 25 and the inclined block 2 29, the transposition ring 28 rotates and stops pressing the guide sleeve 8. Under the rebound force of the compression spring 27, the transposition ring 28 is driven to slide in the guide groove 30 until the elastic block 32 enters the positioning groove 31. After the transposition ring 28 is stuck, the guide sleeve 8 is tightly pressed against the surface of multiple guide blocks 26.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An anti-needlestick auxiliary injection device, comprising a hollow outer sheath (1), characterized in that: A front shield (7) is fixed inside one side of the outer shield (1), a syringe barrel (36) is slidably mounted inside the front shield (7), an injection needle (33) is mounted in the middle of the outlet end of the syringe barrel (36), a trigger sleeve (5) is slidably connected inside the other side of the outer shield (1), a shield 1 (9) is mounted inside the trigger sleeve (5), a connecting seat (11) is fixed at one end of the shield 1 (9), and a rotating trigger component for driving the core rod (34) to move is arranged inside the shield 1 (9), and a start protection component is arranged on the outer surface of the outer shield (1); The startup protection component comprises a safety sleeve (2), a safety wedge seat (3) is mounted on the surface of the safety sleeve (2), a vertical through groove (37) is provided on the top surface of the safety wedge seat (3), and a transverse through groove (38) is provided on the inner bottom surface of the safety wedge seat (3), a wedge block (4) is provided inside the transverse through groove (38), an inclined portion (39) is provided in the middle of the bottom surface of the wedge block (4), and a groove and a slide groove for the wedge block (4) to slide into are provided on the end surface of the trigger sleeve (5); The activation protection component further comprises an activation groove (19) and a safety groove (20) provided on the outer surface of the outer sheath (1); The outer part of the syringe barrel (36) is sleeved with a second sheath (23); the inner wall surface of the outer sheath (1) is provided with a docking seat (40) that slides in the slot; an injection spring (10) is installed between the docking seat (40) and the end of the second sheath (23); the end of the second sheath (23) is clamped with a connecting seat (11); the inner cavity of the connecting seat (11) is in contact with the syringe barrel (36); and the end surface of the trigger sleeve (5) is provided with a contact piece (18) that contacts the inclined portion (39).

2. The needle-stick-proof auxiliary injection device according to claim 1, characterized in that: A wedge seat groove (42) is provided inside the safety sleeve (2); a clamping block (43) is provided on one side of the safety wedge seat (3) and is engaged with the inner wall surface of the wedge seat groove (42); a vacant portion (41) is provided at the bottom end of the safety wedge seat (3); the vacant portion (41) is located outside the outer sleeve (1); and a mounting groove (21) for the safety wedge seat (3) to enter is provided on the outer surface of the outer sleeve (1).

3. The needle-stick-proof auxiliary injection device according to claim 2, characterized in that: A core rod (34) is slidably mounted inside the syringe barrel (36), a push plug (35) is fixedly mounted on one side of the core rod (34) and slides inside the syringe barrel (36), and a plug seat is clamped at the end of the sheath 1 (9); The rotary trigger assembly comprises a push seat (22) in contact with the end of a core rod (34), a ring seat (13) is rotatably arranged on the middle outer surface of the push seat (22), and a core rod spring (24) is installed between the push seat (22) and the blocking seat, a rebound pin (14) is installed on the outer surface of the ring seat (13), an L-shaped groove (12) slidably matched with the rebound pin (14) is provided on the surface of the sleeve (9), and the L-shaped groove (12) includes a clamping end and a straight end, a circular groove hole (15) is provided on the outer surface of the trigger sleeve (5), a straight groove (16) is provided on one side of the circular groove hole (15), and a trigger pin (17) abutting against the rebound pin (14) is slidably clamped inside the straight groove (16).

4. The needle-stick-proof auxiliary injection device according to claim 3, characterized in that: A plug for sealing the syringe barrel (36) is provided on one side of the interior of the front shield (7), a sealing rubber plug is sleeved on the outside of the injection needle (33), and a protective cap (6) used in conjunction with the sealing rubber plug is sleeved on one side of the exterior of the outer shield (1).

5. The needle-stick-proof auxiliary injection device according to claim 4, characterized in that: The front shield (7) is provided with a transposition anti-secondary use component, the transposition anti-secondary use component comprising a compression spring (27) sleeved on the outside of the front shield (7) and a guide sleeve (8) slidably sleeved on the front shield (7), the end of the compression spring (27) is connected to a transposition ring (28), the surface of the transposition ring (28) is symmetrically provided with two inclined blocks (29), and the inner wall surface of the transposition ring (28) is provided with two elastic clamping blocks (32); The end surface of the guide sleeve (8) is provided with an inclined block 1 (25) which is in close contact with the corresponding inclined block 2 (29), and the outer surface of the guide sleeve (8) is provided with a clamping groove which is slidably matched with the guide block (26). The outer surface of the front sleeve (7) is provided with a plurality of guide blocks (26) for the guide sleeve (8) to slide through. The outer surface of the front sleeve (7) is provided with two guide grooves (30), and the end surface of the guide groove (30) is provided with a clamping groove (31) for the corresponding elastic clamping block (32) to be clamped into.

6. The needle-stick-proof auxiliary injection device according to claim 5, characterized in that: The method for using the injection device comprises the following steps: Step 1: first remove the protective cap (6) and push the safety sleeve (2) to slide from the safety slot (20) to the position of the activation slot (19); Step 2: After the injection needle (33) is aligned with the injection skin, the trigger sleeve (5) is pressed to slide inside the outer sheath (1), and the injection spring (10) is activated, and the syringe barrel (36) drives the injection needle (33) to pierce the skin; Step 3: When the syringe barrel (36) is fitted with the plug in the front sheath (7), the trigger pin (17) and the rebound pin (14) are in contact with each other, causing the rotary trigger assembly to rotate, and the core rod spring (24) is triggered to rebound from the tensioned state, pushing the core rod (34) to slide in the syringe barrel (36), thereby completing the injection of the liquid medicine; Step 4: After the injection is completed, the guide sleeve (8) is pressed to slide on the front sleeve (7) in a directional manner. Under the contact between the inclined block 1 (25) and the inclined block 2 (29), the transposition ring (28) rotates and stops pressing the guide sleeve (8). Under the rebound force of the compression spring (27), the transposition ring (28) is driven to slide in the guide groove (30) until the elastic clamping block (32) enters the clamping groove (31). After the transposition ring (28) is locked, the guide sleeve (8) is tightly pressed against the surfaces of the multiple guide blocks (26).

7. The needle-stick-proof auxiliary injection device according to claim 6, characterized in that: In step 1, the safety condom (2) is inserted into the safety groove (20) as an initial position, at which time the wedge block (4) is located inside the transverse through groove (38) to prevent the syringe barrel (36) from being triggered; when the safety condom (2) slides into the activation groove (19), the safety is released, at which time the wedge block (4) is located at a position where the transverse through groove (38) communicates with the vertical through groove (37).

8. The needle-stick-proof auxiliary injection device according to claim 7, characterized in that: In step 2, the end of the trigger sleeve (5) contacts the inclined portion (39), causing the wedge block (4) to rise and enter the interior of the vertical through groove (37). Since the second sleeve (23), the syringe barrel (36) and the connecting seat (11) are connected together, the injection spring (10) rebounds to push the second sleeve (23) and the first sleeve (9) to move together, completing the insertion of the injection needle (33).

9. The needle-stick-proof auxiliary injection device according to claim 8, characterized in that: In step three, the trigger pin (17) is inserted into the circular groove hole (15). When the trigger sleeve (5) is pressed, the trigger pin (17) slides in the straight groove (16) and contacts the rebound pin (14). The rebound pin (14) drives the ring seat (13) to rotate on the outer surface of the push seat (22). At this time, the rebound pin (14) moves from the clamping end of the L-shaped groove (12) to the straight end, triggering the core rod spring (24) to rebound. After rebounding, the core rod (34) is pushed by the push seat (22) to perform injection.

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