A protective sleeve with injection speed adjustment

Abstract

The application provides a protective sleeve with injection speed adjustment, and relates to the technical field of syringes.The detachable sleeve covering protection of the needle is realized by cooperation of the elliptical hole and the elliptical block.The variable resistance mechanism realizes the stepwise adjustment of the resistance of the push rod by cooperation of the wrapping groove, the taper block, the push rod, the taper groove, the iron block and the handle.The protective sleeve uses multiple groups of the sticking blocks to slide along the sliding groove to the position of the needle, and forms a closed protection cavity by the magnetic attraction of the opposite magnetic strips.Meanwhile, the different numbers of the sticking block groups are pushed to the push rod, so that the taper blocks on the push rod are clamped into the taper groove.The magnetic attraction force is multiplied to the friction force by the included angle of the taper groove being less than 90 degrees.The resistance of the push rod is changed by adjusting the number of the sticking block groups participating in the friction, so that the injection speed is controlled.The two functions of needle protection and speed adjustment are integrated in the same set of sliding sticking block assembly, and the problems of function redundancy and accessory separation of the traditional syringe are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of syringe technology, and more specifically, to a protective sleeve with injection speed adjustment. Background Technology

[0002] In the existing technology, medical syringes usually need to be covered with a separate needle protective cap when not in use to prevent needle tip injury or contamination. The injection speed adjustment function of the syringe needs to be achieved by another separate flow control device. These two functions are accomplished by separate accessories, which leads to the need for frequent replacement or carrying multiple sets of equipment during use.

[0003] Because needle protection and speed adjustment are designed as separate modules, the number of syringe accessories and manufacturing costs are increased. Furthermore, functional redundancy occupies valuable operating and storage space. This is particularly problematic in emergency or mobile healthcare scenarios, where healthcare workers struggle to quickly switch between or integrate these two functions, severely impacting the convenience and clinical efficiency of injection procedures. In existing technologies, medical syringes typically require separate needle protectors when not in use to prevent needlestick injuries or cross-contamination. The injection speed adjustment function requires a separate flow control device (such as a micro-infusion pump or speed controller). These two functions are performed by separate accessories, necessitating the preparation of multiple sets of equipment in clinical use. This not only increases the number of accessories and carrying burden but also results in significant equipment redundancy and resource waste due to the inability to integrate functional modules.

[0004] Because needle protection and speed regulation are designed as independent systems with a lack of mechanical or flow path coordination, the syringe body cannot simultaneously meet the dual requirements of safety protection and flow regulation without replacing accessories. This not only increases manufacturing and maintenance costs, but also reduces injection efficiency in emergency or mobile medical scenarios due to the fragmented operation process, severely restricting the functional integration and ease of use of syringes as basic medical devices. Summary of the Invention

[0005] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a protective sleeve with injection speed adjustment to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a protective sleeve with injection speed adjustment, comprising a needle; and further comprising a protective mechanism and a variable resistance mechanism; The protective mechanism includes two fixing grooves formed on the end face of the needle tube. An upper patch and a lower patch are attached to the side wall of the needle tube near the fixing groove. A guide strip is provided on the side of the upper patch and the lower patch near the needle tube. The guide strip is detachably and slidably connected in the fixing groove. A guide groove is formed on the side of the upper patch and the lower patch away from the guide strip. A finger sleeve is provided on the side of the upper patch and the lower patch away from each other. An expansion groove is formed on both sides of the upper patch and the lower patch, and the expansion groove extends to the vicinity of the finger sleeve.

[0007] Preferably, the protective mechanism further includes multiple magnetic strips disposed at both ends of the upper and lower adhesive blocks, with two magnetic strips disposed at adjacent ends of the upper and lower adhesive blocks, and the magnetic properties of two adjacent magnetic strips being opposite.

[0008] Preferably, a needle tip is fixedly sleeved at the end of the needle tube, and the needle tip communicates with the needle tube. When the guide strip is in the fixed groove, the minimum distance between the inner grooves of the adjacent surfaces of the upper and lower patches is greater than the maximum diameter of the needle tip.

[0009] Preferably, the sidewall of the needle tube is provided with two sets of sliding grooves, the diameter of the sliding grooves is the same as the diameter of the magnetic strip, and the two ends of the sliding grooves are respectively provided with rounded corners.

[0010] Preferably, the inner wall of the needle tube has an elliptical hole, and the elliptical hole connects to the end face of the needle tube away from the needle tip. An elliptical block is slidably connected inside the elliptical hole, and the elliptical block is made of rubber.

[0011] Preferably, the variable resistance mechanism includes wrapping grooves formed on the adjacent surfaces of the upper and lower pads, and a cone block is provided in each of the multiple wrapping grooves, with adjacent cone blocks arranged symmetrically.

[0012] Preferably, the elliptical block is provided with a push rod, and two sets of conical grooves are equally spaced on the circular sidewall of the push rod. The conical block is pressed into the conical groove, and the angle formed by two adjacent surfaces of the conical groove is less than 90 degrees.

[0013] Preferably, two iron blocks are symmetrically arranged on the side of the needle tube away from the needle tip, and a magnetic attraction is formed between the two iron blocks and the magnetic strip.

[0014] Preferably, a handle is provided on the side of the push rod away from the elliptical block.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a protective sleeve with injection speed adjustment, which has the following beneficial effects: This invention integrates needle protection and speed regulation functions into a single movable component through a sliding magnetic structure of multiple upper and lower adhesive blocks in the protection mechanism. This eliminates the redundancy of traditional syringes, which require two separate accessories: a needle protector and a micro-injection pump or speed controller. The operator only needs to slide the adhesive block to the needle position for safety protection and slide it to the plunger position for speed regulation. One component performs two functions, significantly reducing the number of accessories and carrying burden, lowering manufacturing costs, and simplifying clinical operation procedures.

[0016] The variable resistance mechanism constructed in this invention utilizes a wedge-shaped angle design with a conical groove of less than 90 degrees to amplify the magnetic attraction between the magnetic strips into a positive pressure between the conical block and the conical groove, thereby generating a static friction force much greater than the magnetic attraction force itself. By selecting different numbers of pad groups to participate in the friction, the resistance of the push rod can be adjusted in stages. The more pad groups there are, the greater the superimposed friction force, the greater the pushing force required for the push rod to advance, and the slower the injection speed, and vice versa. This purely mechanical staged speed adjustment method does not require an external power supply or electronic control, has a simple and reliable structure, and is intuitive to adjust and easy to operate.

[0017] This invention utilizes a dual magnetic locking system—the attraction of opposite magnetic strips and the auxiliary adsorption of an iron block—to ensure the stable positioning of the patch assembly in the working position. In the needle protection state, the patches attract each other to form a closed cavity, effectively preventing accidental exposure of the needle. In the speed adjustment state, the patch assembly adheres tightly to the outer wall of the needle tube through magnetic attraction and is adsorbed by the iron block, ensuring that the cone block always maintains stable pressure on the cone groove. Even under vibration or external impact, it will not loosen, guaranteeing the repeatability and reliability of the speed adjustment resistance.

[0018] This invention organically integrates detailed designs such as the engaging positioning of the guide strip and the fixing groove, the sliding fit between the guide groove and the guide strip, the deformation clearance of the expansion groove, and the smooth introduction of the rounded corners. This allows the patch assembly to move smoothly and be accurately positioned within the sliding groove. The ergonomic design of the finger sleeve allows the operator to easily push the patch assembly. The rubber seal between the elliptical block and the elliptical hole ensures the airtightness of the syringe during injection. All components adopt a modular structure for easy disassembly and cleaning, providing a highly integrated, economical, and practical all-in-one solution for clinical injection operations. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a protective sleeve with injection speed adjustment according to the present invention; Figure 2 This is a schematic diagram of the structure of the needle tube and needle tip in this invention; Figure 3 This is a schematic diagram of the upper and lower adhesive blocks in this invention; Figure 4 This is a cross-sectional view of the push rod in this invention; Figure 5 This is a schematic diagram of the needle tube in this invention; Figure 6 This is a schematic diagram of the side structure of the needle tube in this invention; Figure 7 This is an exploded view of the structure of multiple upper attachment blocks in this invention; Figure 8 This is a schematic diagram of the push rod in this invention.

[0020] In the diagram: 11. Needle; 21. Protective mechanism; 22. Fixing groove; 23. Upper patch; 24. Lower patch; 25. Guide strip; 26. Guide groove; 27. Finger sleeve; 28. Expansion groove; 29. ​​Magnetic strip; 31. Variable resistance mechanism; 32. Wrapping groove; 33. Conical block; 34. Push rod; 35. Conical groove; 36. Iron block; 37. Handle; 210. Needle tip; 211. Slide groove; 212. Rounded corner; 213. Elliptical hole; 214. Elliptical block. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0024] Please see Figures 1 to 8 This embodiment provides a protective sleeve with injection speed adjustment. This protective sleeve aims to solve the technical problem of existing syringes having independent needle protection and speed adjustment functions and redundant equipment. By integrating a protective mechanism with multi-stage magnetic locking and wedge angle force amplification functions and a variable resistance mechanism that can superimpose frictional resistance, reliable protection of the needle and graded adjustment of the push rod advance resistance are achieved. The two functions are integrated into the same accessory, which significantly improves the functional integration and ease of use of the syringe.

[0025] 1. Overall structure and initial state The protective sleeve with injection speed adjustment includes a needle tube 11 as a container, and a protective mechanism 21 and a variable resistance mechanism 31 installed on the needle tube 11. The protective mechanism 21 is used to cover the needle tip 210 to prevent puncture and contamination when not in use, and the variable resistance mechanism 31 is used to adjust the injection speed by changing the frictional resistance.

[0026] 2. Composition of the core system 2.1 Protection Agency 21 The protective mechanism 21 is the core unit for achieving needle protection and multi-stage locking. It includes two fixing grooves 22 on the end face of the needle tube 11. An upper patch 23 and a lower patch 24 are attached to the side wall of the needle tube 11 near the fixing grooves 22. Guide strips 25 are provided on the sides of the upper patch 23 and the lower patch 24 near the needle tube 11. The guide strips 25 are detachably and slidably connected to the fixing grooves 22. A guide groove 26 is provided on the side of the upper patch 23 and the lower patch 24 away from the guide strip 25. A finger sleeve 27 for finger operation is provided on the sides of the upper patch 23 and the lower patch 24 away from each other. An expansion groove 28 is provided on both sides of the upper patch 23 and the lower patch 24, and the expansion groove 28 extends to the vicinity of the finger sleeve 27. Multiple magnetic strips are provided at both ends of the upper patch 23 and the lower patch 24. 29. Two magnetic strips 29 are provided at the adjacent ends of the upper patch 23 and the lower patch 24, and the magnetic strips 29 adjacent to each other are opposite in magnetism. The end of the needle tube 11 is fixedly sleeved with a needle 210 and the needle 210 is connected to the needle tube 11. When the guide strip 25 is in the fixed groove 22, the minimum distance between the inner grooves of the adjacent surfaces of the upper patch 23 and the lower patch 24 is greater than the maximum diameter of the needle 210. Two sets of sliding grooves 211 are provided on the side wall of the needle tube 11, and the diameter of the sliding grooves 211 is the same as the diameter of the magnetic strips 29. The two ends of the sliding grooves 211 are respectively provided with rounded corners 212. The inner wall of the needle tube 11 is provided with an elliptical hole 213 and the elliptical hole 213 is connected to the end face of the needle tube 11 away from the needle 210. An elliptical block 214 is sealed and slidably connected in the elliptical hole 213 and the elliptical block 214 is made of rubber.

[0027] 2.2 Variable resistance mechanism 31 The variable resistance mechanism 31 is the core unit for realizing graded adjustment of injection speed. It includes wrapping grooves 32 opened on the adjacent surfaces of the upper patch 23 and the lower patch 24. Each of the multiple wrapping grooves 32 is provided with a cone block 33, and two adjacent cone blocks 33 are symmetrically arranged. A push rod 34 is fixedly installed on the elliptical block 214. Two sets of cone grooves 35 are equally spaced on the circular side wall of the push rod 34. The cone block 33 is pressed against the cone groove 35. The included angle formed by two adjacent sides of the cone groove 35 is less than 90 degrees. Two iron blocks 36 are symmetrically arranged on the side of the needle tube 11 away from the needle tip 210, and the two iron blocks 36 generate magnetic attraction with the magnetic strip 29. A handle 37 is provided at the end of the push rod 34 away from the elliptical block 214.

[0028] 3. Working process and principle of the device The working process and principle of the protective sleeve with injection speed adjustment are as follows: When protecting the needle 210, the operator inserts the index finger and thumb into the finger sleeves 27 on the upper patch 23 and the lower patch 24 respectively, driving the upper patch 23 and the lower patch 24 to slide along the slide groove 211 towards the needle 210. Since multiple sets of upper patch 23 and lower patch 24 are attracted to each other by magnetic strips 29 and the guide strips 25 are slidably connected in adjacent guide grooves 26, all patches move synchronously. When they move to the position of the needle 210, only the guide strips 25 on the foremost set of upper patch 23 and lower patch 24 are engaged in the fixing groove 22 to achieve axial positioning. The guide strips 25 of the other patches are not engaged in the fixing groove 22. At this time, the magnetic strips 29 between the upper patch 23 and the lower patch 24 attract each other, making each patch fit tightly together. Multiple wrapping grooves 32 together form a closed cavity to accommodate the needle 210, thereby completing the reliable protection of the needle 210.

[0029] When the syringe needs to be used and the injection speed adjusted, the operator slides multiple sets of upper and lower adhesive blocks 23 and 24 along the groove 211 to the area where the push rod 34 is located. Depending on the required injection resistance, different numbers of adhesive block sets are selected and pushed to the end face of the push rod 34. The adhesive blocks pushed to the push rod 34 adhere to each other under the mutual attraction of the magnetic strip 29, causing the cone 33 on it to engage with the conical groove 35 on the push rod 34. Because the included angle between adjacent sides of the conical groove 35 is less than 90 degrees, the contact surface between the cone 33 and the conical groove 35 forms a wedge-shaped self-locking angle. The magnetic attraction force of the magnetic strip 29 is amplified and transformed into a conical... The positive pressure between block 33 and conical groove 35 generates a huge static friction force. At the same time, the magnetic strips 29 at the ends of the upper and lower blocks 23 and the iron block 36 on the syringe 11 generate an auxiliary magnetic attraction force, keeping the block group and the syringe 11 relatively stable. The more blocks there are, the greater the superimposed friction force, and the greater the pushing force required to advance the push rod 34, thereby realizing the graded adjustment of the injection speed. The operator pushes the handle 37 to make the push rod 34 overcome the friction force and insert it into the syringe 11. The elliptical block 214 moves with the push rod 34 to discharge the liquid in the syringe 11 through the needle 210, thus completing the control of the injection speed.

[0030] Working principle summary: This invention achieves rapid covering and protection of the needle 210 through the magnetic sliding of multiple sets of pads in the protection mechanism 21 and the positioning of the fixing groove 22. The wedge angle force amplification of the cone block 33 and cone groove 35 in the variable resistance mechanism 31 and the superposition of the number of pads achieve graded adjustment of the friction force of the push rod 34. The two functions of needle 210 protection and speed adjustment are integrated into the same set of sliding pad components, effectively solving the problems of functional redundancy and accessory separation in traditional syringes.

[0031] Example 2 In another optional embodiment, the included angle of the conical groove 35 can be optimized according to the required force multiplier, the magnetic strength of the magnetic strip 29 can be selected according to different syringe specifications, the elliptical block 214 can be made of rubber material with different hardness to adjust the sealing performance and sliding resistance, and anti-slip texture can be added to the inner surface of the finger sleeve 27 to improve operating comfort, and scale markings can be set on the push rod 34 to make it easy to read the currently adjusted resistance level intuitively.

[0032] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective sleeve with injection speed adjustment, comprising a syringe (11); characterized in that: It also includes a protection mechanism (21) and a variable resistance mechanism (31); The protective mechanism (21) includes two fixing grooves (22) formed on the end face of the needle tube (11). An upper patch (23) and a lower patch (24) are attached to the side wall of the needle tube (11) near the fixing groove (22). A guide strip (25) is provided on the side of the upper patch (23) and the lower patch (24) near the needle tube (11). The guide strip (25) is detachably and slidably connected in the fixing groove (22). A guide groove (26) is formed on the side of the upper patch (23) and the lower patch (24) away from the guide strip (25). A finger sleeve (27) is provided on the side of the upper patch (23) and the lower patch (24) away from each other. An expansion groove (28) is formed on both sides of the upper patch (23) and the lower patch (24). The expansion groove (28) extends to the vicinity of the finger sleeve (27).

2. The protective sleeve with injection speed adjustment according to claim 1, characterized in that: The protective mechanism (21) also includes multiple magnetic strips (29) disposed at both ends of the upper patch (23) and the lower patch (24). Two magnetic strips (29) are disposed at adjacent ends of the upper patch (23) and the lower patch (24), and the magnetic properties of the two adjacent magnetic strips (29) are opposite.

3. A protective sleeve with injection speed adjustment according to claim 2, characterized in that: The end of the needle tube (11) is fixedly sleeved with a needle tip (210), and the needle tip (210) is connected to the needle tube (11). When the guide strip (25) is in the fixed groove (22), the minimum distance between the inner grooves of the adjacent surfaces of the upper patch (23) and the lower patch (24) is greater than the maximum diameter of the needle tip (210).

4. A protective sleeve with injection speed adjustment according to claim 3, characterized in that: The sidewall of the needle tube (11) is provided with two sets of sliding grooves (211). The diameter of the sliding groove (211) is the same as the diameter of the magnetic strip (29), and the two ends of the sliding groove (211) are respectively provided with rounded corners (212).

5. A protective sleeve with injection speed adjustment according to claim 2, characterized in that: The inner wall of the needle tube (11) is provided with an elliptical hole (213), and the elliptical hole (213) is connected to the end face of the needle tube (11) away from the needle tip (210). An elliptical block (214) is slidably connected inside the elliptical hole (213), and the elliptical block (214) is made of rubber.

6. A protective sleeve with injection speed adjustment according to claim 5, characterized in that: The variable resistance mechanism (31) includes a wrapping groove (32) formed on the adjacent surfaces of the upper patch (23) and the lower patch (24). A cone (33) is provided in each of the multiple wrapping grooves (32), and two adjacent cones (33) are symmetrically arranged.

7. A protective sleeve with injection speed adjustment according to claim 6, characterized in that: A push rod (34) is provided on the elliptical block (214). Two sets of conical grooves (35) are equally spaced on the circular sidewall of the push rod (34). The conical block (33) is pressed into the conical groove (35). The angle formed by two adjacent surfaces of the conical groove (35) is less than 90 degrees.

8. A protective sleeve with injection speed adjustment according to claim 7, characterized in that: Two iron blocks (36) are symmetrically arranged on the side of the needle tube (11) away from the needle tip (210), and a magnetic attraction is formed between the two iron blocks (36) and the magnetic strip (29).

9. A protective sleeve with injection speed adjustment according to claim 8, characterized in that: The push rod (34) has a handle (37) on the side away from the elliptical block (214).

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