Micro-injector

Abstract

The microsyringe comprises a needle cylinder, a push rod and a piston, the piston is connected to the end of the push rod and extends into the needle cylinder, a shell is arranged outside the needle cylinder in a sleeved mode, a pair of threaded blocks is arranged in the shell, a threaded hole is formed in the center after the two threaded blocks are combined, and the threaded hole is communicated with the push rod. A threaded surface matched with the threaded hole is machined in the middle section of the push rod, a pair of guide rods are arranged in the shell, the threaded blocks are arranged on the two guide rods in a sleeving mode, opening and closing are achieved by sliding on the guide rods, and an adjusting assembly capable of opening and closing the pair of threaded blocks is further arranged in the shell and comprises an adjusting frame capable of moving in the shell. Two pairs of kidney-shaped inclined grooves are formed in the two sides of the adjusting frame, a pair of circular truncated cones sliding along the kidney-shaped inclined grooves are arranged on the two sides of the two threaded blocks respectively, the circular truncated cones slide in the kidney-shaped inclined grooves to drive the two threaded blocks to be opened and closed, the problem that an existing injector is inconvenient to return is solved, and the insulin injector can be used for insulin injection.

Description

Technical Field

[0001] The utility model relates to the technical field of medical injection, in particular to a micro syringe. Background Art

[0002] The smallest disposable syringe currently in clinical use is 1ML, with a minimum scale of 0.1ML. With the advancement of medical and nursing technologies, smaller doses of drugs have become a clinical need, such as insulin injections and intradermal injections. In particular, in April 2021, the General Office of the National Health Commission issued the Guidelines for Skin Testing of Beta-lactam Antimicrobial Drugs, updating the intradermal dose to 0.02ML-0.03ML. Therefore, small doses of drugs cannot be injected into traditional syringes to meet actual needs.

[0003] Currently, most small-dose syringes are similar to existing mainstream syringes, with the internal cavity of the syringe reduced to accommodate small doses of injection. However, since the minimum scale marking on small-dose syringes is significantly reduced, a nurse can easily inject an excessive amount of liquid medicine with just a little force, making it difficult to control the injection dose. Furthermore, since the injection dose is significantly reduced, the volume of the syringe body is also significantly reduced. As a result, the minimum scale mark on the syringe body is too small and thin, making it difficult to see the scale when injecting a small amount of medicine, resulting in inaccurate injection doses.

[0004] The prior art discloses an assembled high-precision metered-dose syringe, with publication number CN 217286760 U and publication date August 26, 2022. The syringe comprises a sleeve, a core rod, a core rod having a core rod threaded along its axial direction, a bracket, and a nut clamp fixed above the bracket. The nut is rotatably mounted above the bracket via the nut clamp, enabling the nut to rotate relative to the bracket and the nut clamp. The core rod passes through a limiting through-hole in the bracket, which is spaced apart from the limiting through-hole and prevents the core rod from rotating within the limiting through-hole. The core rod thread mates with a threaded through-hole in the nut. When the nut is rotated, the core rod is advanced through the threaded through-hole and the core rod thread. The principle of the syringe is spiral propulsion, which allows for precise control of the dosage of medication. The syringe rotates the syringe to the desired angle according to the desired dosage. However, the disadvantage of this structure is that when the plunger in the syringe needs to be retracted, such as to draw medication, it must be rotated in the opposite direction, which is inconvenient. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a micro syringe to solve the problem of inconvenient return operation of the prior syringe.

[0006] The purpose of the present utility model is achieved as follows: a micro-injection syringe comprises a syringe, a push rod and a piston, the piston is connected to the end of the push rod and extends into the syringe, the outer sleeve of the syringe is provided with a shell, a pair of threaded blocks are provided in the shell, the two threaded blocks are combined to form a threaded hole in the center, the middle section of the push rod is processed with a thread that matches the threaded hole, a pair of guide rods are provided in the shell, the threaded blocks are sleeved on the two guide rods, and opening and closing are achieved by sliding on the guide rods, an adjustment component that can open and close a pair of threaded blocks is also provided in the shell, the adjustment component comprises an adjustment frame that can move axially along the push rod in the shell, two pairs of waist-shaped bevels are provided on both sides of the adjustment frame, a pair of round tables that slide along the waist-shaped bevel are provided on both sides of the two threaded blocks, and the two threaded blocks are driven to open and close by sliding the round tables in the waist-shaped bevel.

[0007] The working principle of this utility model is as follows:

[0008] In the default state, the threaded blocks merge to clamp the push rod, and the push rod cannot move up and down automatically, and needs to be rotated to move. When it is necessary to draw medicine, the operator pushes the adjustment component forward with his fingers. The adjustment component separates the two threaded blocks through the cooperation of the waist-shaped bevel and the round table on the adjustment frame. At this time, the push rod loses the restraint of the two threaded blocks and can move freely in the syringe. The mouth of the needle is inserted into the medicine bottle. The operator pulls the push rod backward to draw the medicine into the syringe. After the absorption is completed, the push rod is slightly pushed forward to adjust the injection state. After completion, the operator pushes the adjustment component backward to merge the two threaded blocks to clamp the push rod, and then rotates the push rod as needed. It slowly moves forward under the action of the threaded connection between the push rod and the threaded block to complete the injection.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] This new syringe features an openable and closable threaded block within the syringe barrel to adjust the push rod's motion (rapid movement when separating, slow movement when closing), resolving the inconvenience of retracting existing syringes. The new syringe can also be used as a standard syringe, eliminating the need for the threaded block to restrict the push rod. It can be used for insulin injections.

[0011] To facilitate adjustment of the adjustment assembly, two slides are provided on either side of the housing. The bottom of the adjustment frame is connected to two adjustment sliders extending from the slides. These sliders slide within the slides, driving the adjustment frame within the housing along the axis of the push rod to open and close. This design makes adjustment easier for the operator.

[0012] In order to avoid slipping during operation and affecting the user experience and effect, the outer surface of the adjustment slider is processed into a corrugated surface. The corrugated surface prevents slipping by increasing friction.

[0013] In order to make the opening and closing of the threaded block more reliable, the two guide rods are symmetrically arranged on the inner wall of the shell on both sides of the push rod and are parallel to the radial direction of the push rod.

[0014] In order to further make the opening and closing of the threaded block more reliable, a pair of threaded surfaces are processed on the inner sides of the two threaded blocks, and the threaded hole is formed by connecting the two threaded surfaces. A pair of guide holes that cooperate with the guide rod are processed on both sides of the threaded surface.

[0015] In order to facilitate the assembly of the shell, the shell is formed by splicing two half shells, and the guide rod is arranged on the inner wall of one of the half shells.

[0016] In order to facilitate the assembly of the threaded block, a first limiting plate group is provided on the inner walls of the two half shells. The first clamping plate group consists of two pairs of limiting plates respectively provided on the inner walls of the half shells.

[0017] To enhance the reliability of the present invention, a second clamping plate assembly is provided on the inner walls of the two half shells to limit the axial movement of the syringe. The second clamping plate assembly comprises two pairs of limit plates, one on each of the inner walls of the half shells. The second clamping plate assembly can limit the axial movement of the syringe, making the present invention more reliable.

[0018] In order to facilitate the addition of medicine into the syringe, a dosing head is provided on one side of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the external structure of the utility model.

[0021] Figure 2 This is an exploded view of the utility model.

[0022] Figure 3 This is a schematic diagram of the thread block structure in the utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the adjustment component in the utility model.

[0024] Figure 5 This is a schematic diagram of the shell structure of the present utility model.

[0025] Among them, 1 syringe, 2 push rod, 2a handle, 3 piston, 4 shell, 4a slide, 5 thread block, 5a guide hole, 5b round table, 5c baffle, 5d threaded surface, 6 dosing head, 7 guide rod, 8 adjustment assembly, 8a adjustment frame, 8b waist-shaped inclined groove, 8c adjustment slider, 8d connecting arm, 9 first splint group, 10 second splint group. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figure 1-5 The micro-syringe shown includes a syringe 1, a push rod 2 and a piston 3. The piston 3 is connected to the end of the push rod 2 and extends into the syringe 1. The top of the push rod 2 is provided with a handle 2a. The outer shell 4 is provided on the outside of the syringe 1. A pair of threaded blocks 5 are provided in the shell 4. When the two threaded blocks 5 are combined, a threaded hole is formed in the center. The middle section of the push rod 2 is processed with a thread that matches the threaded hole. The push rod 2 is set through the two threaded blocks 5. The push rod 2 is rotated to match the threaded connection to achieve the up and down movement of the push rod 2. A dosing head 6 is provided on one side of the syringe 1 near the needle position.

[0028] In this embodiment, in order to realize the opening and closing of the threaded block 5, a pair of guide rods 7 are provided in the housing 4, and the two threaded blocks 5 are sleeved on the two guide rods 7. The opening and closing are realized by sliding on the guide rods 7. The housing 4 is also provided with an adjustment component 8 for driving the pair of threaded blocks 5 to move toward each other along the guide rods 7 to realize opening and closing. The adjustment component 8 includes an adjustment frame 8a that can move axially along the push rod 2 in the housing 4. Two pairs of waist-shaped bevel grooves 8b are provided on both sides of the adjustment frame 8a. The waist-shaped bevel grooves 8b on each side are symmetrically arranged. A pair of round tables 5b sliding along the waist-shaped bevel grooves 8b are respectively provided on both sides of the two threaded blocks 5. The adjustment frame 8a moves axially along the syringe 1 so that the round table 5b slides in the waist-shaped bevel groove 8b, driving the two threaded blocks 5 to open and close.

[0029] In this embodiment, in order to make the operation of the adjustment frame 8a more convenient, slide grooves 4a are provided on both sides of the shell 4, and the bottom of the adjustment frame 8a is connected with two adjustment sliders 8c extending from the slide grooves 4a. The adjustment slider 8c is connected to the adjustment frame 8a via an L-shaped connecting arm 8d. The vertical part of the connecting arm 8d is arranged in the shell 4, and the horizontal part of the connecting arm 8d is located in the slide groove 4a and slides along the slide groove 4a. The adjustment slider 8c drives the adjustment frame 8a to move axially along the push rod 2 in the shell 4 by sliding in the slide groove 4a to achieve opening and closing. The outer surface of the adjustment slider 8c is processed into a corrugated surface, and the design of the corrugated surface can well achieve an anti-slip effect.

[0030] In this embodiment, in order to facilitate the assembly of the two threaded blocks 5, the two guide rods 7 are symmetrically arranged on the inner walls of the shell 4 on both sides of the push rod 2 and parallel to the radial direction of the push rod 2. A pair of threaded surfaces 5d are processed on the inner sides of the two threaded blocks 5, and a pair of baffles 5c for easy assembly are provided on the top of one threaded block 5. The threaded hole is formed by docking the two threaded surfaces 5d, and a pair of guide holes 5a that cooperate with the guide rod 7 are processed on both sides of the threaded surface 5d. The shell 4 is spliced ​​together by two half shells, and the guide rod 7 is arranged on the inner wall of one of the half shells. A first limit plate group is provided on the inner walls of the two half shells. The first splint group 9 consists of two pairs of limit plates respectively arranged on the inner walls of the half shells. A second splint group 10 for limiting the axial movement of the syringe 1 is provided on the inner walls of the two half shells. The second splint group 10 consists of two pairs of limit plates respectively arranged on the inner walls of the half shells. During the specific installation, first install a threaded block 5 into the adjusting frame 8a, and insert the corresponding frustum 5b on both sides into the waist-shaped bevel grooves 8b on both sides of the adjusting frame 8a. Install the push rod 2 from the top of the adjusting frame 8a, and then install another threaded block 5. Similarly, the frustum 5b on both sides are inserted into the waist-shaped bevel grooves 8b on both sides of the adjusting frame 8a. Under the action of the baffle 5c, the two threaded blocks 5 are flush, and the syringe 1 is installed from the bottom of the push rod 2. At this time, the whole is inserted into the guide rod 7 of one half of the shell through the guide hole 5a on the threaded block 5. At the same time, the limiting edge of the top of the syringe 1 is inserted into the second plywood group 10, and finally, the other half shell is closed to complete the overall assembly.

[0031] When the present invention is working, in the default state, the threaded blocks 5 are combined to clamp the push rod 2, and the push rod 2 cannot move up and down automatically, and needs to be rotated to move. When it is necessary to draw medicine or withdraw the push rod 2, the operator pushes the adjusting slider 8c forward with his fingers, and the adjusting slider 8c separates the two threaded blocks 5 through the cooperation of the waist-shaped inclined groove 8b and the round table 5b on the adjusting frame 8a. At this time, the push rod 2 loses the restraint of the two threaded blocks 5 and can move freely in the syringe 1, extending the mouth of the needle tube into the medicine bottle, and the operator pulls the push rod 2 backward to draw medicine into the syringe 1. After the drawing is completed, the push rod 2 is slightly pushed forward to adjust the injection state. After completion, the operator pushes the adjusting assembly 8 backward to combine the two threaded blocks 5 so that it clamps the push rod 2, and then rotates the push rod 2 as needed. It slowly moves forward under the action of the threaded connection between the push rod 2 and the threaded block 5 to complete the injection.

[0032] The above embodiments are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A micro syringe comprising a syringe (1), a push rod (2) and a piston (3), wherein the piston (3) is connected to the end of the push rod (2) and extends into the syringe (1), characterized in that: The outer shell (4) of the needle cylinder (1) is provided with a shell (4), and a pair of threaded blocks (5) are provided in the shell (4). The two threaded blocks (5) are combined to form a threaded hole in the center. The middle section of the push rod (2) is processed with a thread that matches the threaded hole. A pair of guide rods (7) are provided in the shell (4). The threaded blocks (5) are sleeved on the two guide rods (7) and are opened and closed by sliding on the guide rods (7). The shell (4) is also provided with an adjustment component (8) that can open and close the pair of threaded blocks (5). The adjustment component (8) includes an adjustment frame (8a) that can move in the shell (4). Two pairs of waist-shaped inclined grooves (8b) are provided on both sides of the adjustment frame (8a). A pair of round tables (5b) that slide along the waist-shaped inclined grooves (8b) are provided on both sides of the two threaded blocks (5). The round tables (5b) slide in the waist-shaped inclined grooves (8b) to drive the two threaded blocks (5) to open and close.

2. A micro syringe according to claim 1, characterized in that, Slide grooves (4a) are provided on both sides of the housing (4), and the bottom of the adjustment frame (8a) is connected to two adjustment sliders (8c) extending from the slide grooves (4a). The adjustment sliders (8c) slide in the slide grooves (4a) to drive the adjustment frame (8a) to move axially along the push rod (2) in the housing (4) to achieve opening and closing.

3. A micro syringe according to claim 2, characterized in that, The outer surface of the adjusting slider (8c) is processed into a corrugated surface.

4. A micro-injector according to any one of claims 1 to 3, characterized in that: The two guide rods (7) are symmetrically arranged on the inner wall of the housing (4) on both sides of the push rod (2) and are parallel to the radial direction of the push rod (2).

5. A micro-injector according to claim 4, characterized in that: A pair of threaded surfaces (5d) are machined on the inner sides of the two threaded blocks (5), and a threaded hole is formed by butting the two threaded surfaces (5d). A pair of guide holes (5a) that cooperate with the guide rod (7) are machined on both sides of the threaded surface (5d).

6. A micro-injector according to any one of claims 1 to 3, characterized in that: The outer shell (4) is formed by splicing two half shells, and the guide rod (7) is arranged on the inner wall of one of the half shells.

7. A micro-injector according to claim 6, characterized in that: A first limiting plate group is provided on the inner walls of the two half shells, and the first clamping plate group (9) is composed of two pairs of limiting plates respectively provided on the inner walls of the half shells.

8. A micro-injector according to claim 6, characterized in that: A second clamping plate group (10) for limiting the axial movement of the needle cylinder (1) is provided on the inner walls of the two half shells. The second clamping plate group (10) is composed of two pairs of limiting plates respectively provided on the inner walls of the half shells.

9. A micro syringe according to any one of claims 1 to 3, characterized in that: A dosing head (6) is provided on one side of the syringe (1).

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