Fixed-dose injector

Abstract

The utility model discloses a fixed dose injector, which relates to the technical field of injectors, and comprises a needle cylinder, the core rod is arranged on the inner side of the needle cylinder in a sliding mode, and the core rod is integrally formed by two or more than two core rod grids which are arranged at equal angles; the blocking grids are arranged on the core rod, and each blocking grid is located between every two adjacent core rod grids; the blocking device is arranged on the top face of the needle cylinder, and a limiting part is arranged on the side, facing the core rod, of the blocking device and can abut against the blocking grid. According to the fixed-dose injector, the technical problems that the efficiency is low, the accuracy is low and errors are prone to occurring when medical staff determine the liquid pumping amount in a visual mode are solved, and the blocking grid arranged on the core rod and the blocking device arranged on the top face of the needle cylinder are matched with each other; when the core rod drives the rubber plug to be lifted to a set height, the blocking grid abuts against the limiting part, extraction of the fixed-dose liquid medicine is completed, the liquid extraction amount of the injector is accurately controlled, and the purpose of extracting the fixed-dose liquid medicine or accurately dispensing medicine is achieved.

Description

Technical Field

[0001] This utility model relates to the field of syringe technology, and in particular to a fixed-dose syringe. Background Technology

[0002] A syringe is a medical device used to inject liquid medications. It is usually made of glass or plastic and has a needle attached to one end. When using a regular syringe to draw medication, the amount to be drawn is determined by judging the concentration of the medication in the vial, the maximum draw volume of the syringe, or by the medical staff visually observing the markings on the syringe barrel.

[0003] However, visually determining the amount of medication to be drawn is not only inefficient but also inaccurate and prone to error. Drawing more medication than the predetermined dose can lead to waste and harm to the patient. Drawing too little medication, on the other hand, affects the treatment effect. Therefore, a fixed-dose syringe is proposed to address these problems. Utility Model Content

[0004] The purpose of this invention is to provide a fixed-dose syringe that solves the technical problem that visually determining the amount of fluid to be drawn by medical staff is not only inefficient but also has low accuracy and is prone to errors.

[0005] To achieve the above objectives, this utility model provides a fixed-dose syringe, comprising:

[0006] Syringe;

[0007] The core rod is slidably disposed inside the syringe, and the core rod is integrally formed from two or more core rod grids arranged at equal angles;

[0008] A stop is provided on the core rod, and the stop is located between two adjacent core rod grids;

[0009] A blocking device is provided on the top surface of the syringe, and a limiting part is provided on the side of the blocking device facing the core rod, which can abut against the stop.

[0010] Preferably, the blocking device includes: one or more fixing sleeves symmetrically arranged on the top surface of the syringe, wherein the limiting part is provided on the side of one of the fixing sleeves facing the core rod.

[0011] Preferably, one of the core rod grids has a through-hole on one side of the grid that connects to the grid, and the through-hole is located above the grid.

[0012] Preferably, when the top surface of the baffle abuts against the bottom surface of the limiting part, the height position of the baffle hole relative to the syringe is the same as the height position of the limiting part relative to the syringe, and the thickness of the limiting part is less than the height of the baffle hole.

[0013] Preferably, both the limiting part and the stop are fan-shaped.

[0014] Preferably, one or more handles are symmetrically arranged at the upper end of the syringe, and a mounting groove is provided on the side of the fixing sleeve facing the core rod, and the mounting groove is sleeved to connect the handles.

[0015] Preferably, the top surface of the handle is provided with a positioning groove, and the top surface of the mounting groove is provided with a positioning boss, the positioning boss being engaged with the positioning groove.

[0016] Preferably, the top surface of the handle is provided with an insertion hole, and the lower part of the blocking device is provided with an elastic hook, which is engaged with the insertion hole.

[0017] Preferably, a rubber stopper is provided at the lower end of the core rod, and the outer side wall of the rubber stopper is attached to the inner side wall of the syringe.

[0018] Preferably, at least one of the stops is provided on the core rod, and along the length direction of the core rod, two adjacent stops are not on the same projection plane.

[0019] Compared with the above-mentioned background technology, the fixed-dose syringe provided by this utility model has the following beneficial effects: by the cooperation of the stop provided on the core rod and the blocking device provided on the top surface of the syringe, when the core rod drives the rubber stopper to rise to a set height, the stop abuts against the limiting part. Under the limiting action of the limiting part, the core rod cannot be lifted, thus completing the extraction of a fixed dose of medicine, thereby accurately controlling the liquid volume drawn by the syringe. Moreover, the operation is simple and not prone to errors, achieving the purpose of extracting a fixed dose of medicine or accurately preparing medicine. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the fixed-dose syringe provided in an embodiment of the present invention;

[0022] Figure 2 This is a plan view of the core rod provided in an embodiment of the present utility model;

[0023] Figure 3 for Figure 2 Schematic diagram of the cross section at point AA;

[0024] Figure 4 This is a plan view of the syringe provided in an embodiment of the present utility model;

[0025] Figure 5 This is a cross-sectional schematic diagram of the blocking device provided in an embodiment of the present utility model;

[0026] Figure 6 This is a partial assembly diagram of the blocking device and syringe provided in another embodiment of the present invention.

[0027] Specifically, 1-syringe; 2-core bar; 201-barrel hole; 3-barrel; 4-blocking device; 401-fixing sleeve; 402-limiting part; 5-mounting groove; 501-positioning boss; 6-handle; 7-positioning groove; 8-rubber plug; 9-insertion hole; 10-elastic hook. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, in order to achieve the above objectives, this utility model provides a fixed-dose syringe, comprising: a syringe barrel 1, a core rod, a rubber stopper 8, and a blocking device 4.

[0031] The syringe 1 has a core rod that slides inside. The core rod is integrally formed from two or more core rod grids 2 that are set at equal angles. Preferably, the core rod is integrally formed from four core rod grids 2 that are set at equal angles. Several baffles 3 are set on the core rod, and the baffles 3 are located between two adjacent core rod grids 2.

[0032] Meanwhile, a blocking device 4 is provided on the top surface of the syringe 1. A limiting part 402 is provided on the side of the blocking device 4 facing the core rod. The limiting part 402 can abut against the stop 3. When the core rod is pulled up until the stop 3 reaches the limiting part 402 and abuts against the limiting part 402, the limiting part 402 can limit the stop 3 to ensure that the syringe 1 can draw a fixed amount of liquid, thereby enabling precise control of the overall liquid drawing volume of the syringe. Moreover, compared with visual operation, it is simpler to operate, less prone to errors, and more efficient when drawing a fixed dose of liquid, effectively improving the efficiency of drug preparation.

[0033] When drawing medication, the needle enters the medication bottle, and the plunger is pulled up, initiating the extraction of medication from syringe 1. When the stop 3 moves to and holds the limiting part 402, a fixed dose of medication is extracted. The volume of medication drawn by the syringe can be precisely controlled, achieving the purpose of fixed-dose extraction or accurate medication preparation. After the medication is completely drawn, the plunger is rotated forward at a certain angle until, along the length of the plunger, the stop 3 and the limiting part 402 are no longer on the same projection plane. At this point, the plunger can slide freely within syringe 1, functioning similarly to a regular syringe, making it easy to push the plunger back to its initial position.

[0034] In one embodiment of this utility model, the blocking device 4 includes: one or more fixed sleeves 401 disposed on the top surface of the syringe 1, wherein a limiting part 402 is provided on the side of the fixed sleeve 401 facing the core rod. It should be noted that when the core rod is rotated to a certain angle, the limiting part 402 can be located between the two core rod grids 2, and along the length direction of the core rod, the stop 3 and the limiting part 402 can be on the same projection plane, so as to ensure that when the core rod is pulled up, the stop 3 can move to the position of the limiting part 402 and hold the limiting part 402, thereby achieving the purpose of drawing a fixed dose of liquid medicine.

[0035] It should be further explained that a through-hole 201 is provided on one side of the core rod 2 connected to the stop 3. The stop hole 201 is located above the stop 3. Specifically, when the top surface of the stop 3 abuts against the bottom surface of the limiting part 402, the height position of the stop hole 201 relative to the syringe 1 is the same as the height position of the limiting part 402 relative to the syringe 1, and the thickness of the limiting part 402 is less than the height of the stop hole 201. When the core rod rotates in the forward direction, the limiting part 402 can pass through the stop hole to ensure that the stop 3 can move along the length direction of the core rod. The stop 3 and the limiting part 402 are not on the same projection plane, thereby realizing multiple pulls of the core rod to draw more liquid.

[0036] In addition, both the limiting part 402 and the stop 3 are fan-shaped to cooperate with the rotation of the core rod. When the syringe draws a fixed dose of medicine and the core rod needs to be pulled up, the core rod needs to rotate forward relative to the syringe 1. At this time, the bottom surface of the limiting part 402 and the top surface of the stop 3 are always in contact until the limiting part 402 completely passes through the stop hole and separates from the stop 3. This ensures that the core rod will not float up and down relative to the syringe 1 during rotation, avoiding the entry of air and the discharge of the original medicine in the syringe 1. This further ensures that the amount of medicine drawn by the syringe is accurately controlled, so as to achieve the purpose of drawing a fixed dose of medicine or accurately preparing medicine.

[0037] In one embodiment of this utility model, one or more handles 6 are symmetrically arranged at the upper end of the syringe 1. A mounting groove 5 is provided on the side of the fixing sleeve 401 facing the core rod. The mounting groove 5 is sleeved and connected to the handle 6. The height of the mounting groove 5 is equal to the thickness of the handle 6 to ensure that the handle 6 can smoothly enter the mounting groove 5. In addition, the lower part of the side of the fixing sleeve 401 facing the syringe 1 is set in an arc shape. After the fixing sleeve 401 is sleeved on the handle 6, the lower part of the side of the fixing sleeve 401 facing the syringe 1 fits against the outer wall of the syringe 1, so that the fixing sleeve 401 is stably connected to the handle 6.

[0038] like Figure 4 and Figure 5 As shown, preferably, a positioning groove 7 is provided on the top surface of the handle 6, and a positioning boss 501 is provided on the top surface of the mounting groove 5. After the fixing sleeve 401 is fitted onto the handle 6, the positioning boss 501 engages with the positioning groove 7, further enhancing the connection strength between the fixing sleeve 401 and the handle 6, and ensuring that the fixing sleeve 401 is not easily detached from the handle 6.

[0039] like Figure 6 As shown, in another embodiment of this utility model, an insertion hole 9 can be provided on the top surface of the handle 6, and an elastic hook can be provided at the lower part of the blocking device 4. The elastic hook is integrally set with the blocking device 4. After the fixing sleeve 401 is fitted onto the handle 6, the elastic hook is located on the bottom surface of the handle 6. Utilizing the elasticity of the elastic hook, the elastic hook is directly inserted into the insertion hole 9 to achieve the purpose of connecting the fixing sleeve 401 and completing the assembly of the blocking device 4, which replaces the method of connecting the fixing sleeve 401 by the positioning groove 7 and the positioning protrusion.

[0040] It should be noted that a rubber stopper 8 is provided at the lower end of the core rod. The rubber stopper 8 is made of rubber. After the rubber stopper 8 enters the syringe 1 with the core rod, the rubber stopper 8 is coaxial with the syringe 1. The outer side wall of the rubber stopper 8 is in close contact with the inner side wall of the syringe 1. By pressing down and pulling up the core rod, the rubber stopper 8 is driven to reciprocate in the syringe 1 to draw out the medicine.

[0041] Preferably, a snap-fit ​​protrusion (not shown in the figure) can be provided at the lower end of the core rod, and a snap-fit ​​groove (not shown in the figure) can be provided on the upper end face of the rubber stopper 8. The snap-fit ​​protrusion is snapped into the groove through the snap-fit ​​groove. Taking advantage of the elastic deformation of the rubber stopper 8, the snap-fit ​​protrusion can be inserted into the snap-fit ​​groove, so as to realize the detachable connection of the rubber stopper 8 at the lower end of the core rod, which facilitates the assembly of the entire syringe 1.

[0042] Preferably, a stop 3 is provided on the core rod. When the core rod is pulled up for the first time until the stop 3 reaches the limiting part 402, a fixed dose of medicine is extracted. After the core rod is rotated forward by a certain angle, the stop 3 leaves the limiting part 402, and the core rod can be pulled up more times to extract more medicine.

[0043] Depending on the patient's needs, one or more stops 3 can be installed on the syringe plunger. Adjacent stops 3 are not on the same projection plane along the length of the plunger. Specifically, when two stops 3 are installed on the plunger, the plunger is pulled up once until the first stop 3 abuts against the limiting part 402, drawing a fixed dose of medication. After rotating the plunger forward by a certain angle, the first stop 3 moves away from the limiting part 402. When the plunger is pulled up a second time, the second stop 3 moves to and abuts against the limiting part 402, completing the drawing of another fixed dose of medication. Similarly, when three stops 3 are installed on the plunger, after rotating the plunger forward by a certain angle, the second stop 3 moves away from the limiting part 402. When the plunger is pulled up a third time, the third stop 3 moves to and abuts against the limiting part 402, completing the drawing of a third fixed dose of medication. By flexibly changing the syringe structure to draw multiple fixed doses of medication, accurate medication dispensing can be achieved. It should be noted that each stop 3 is provided with a stop hole above it that is compatible with the limiting part 402, so as to ensure that the limiting part 402 can pass smoothly through the stop hole.

[0044] In the initial state of use, the rubber stopper 8 is located inside the syringe 1, near the needle tip. The needle enters the medicine bottle, and the core rod is pulled up. The core rod pulls the rubber stopper 8, and the syringe 1 begins to draw out the medicine. When the stop 3 moves to the position of the limiting part 402 and holds the limiting part 402, the drawing of a fixed dose of medicine is completed. After the medicine is drawn out, the core rod is rotated forward at a certain angle until the stop 3 and the limiting part 402 are not on the same projection plane along the length of the core rod, which is the same as the function of a regular syringe. At this time, the core rod can slide freely inside the syringe 1, and the needle is placed into another medicine bottle. Pulling the core rod up further can draw out the medicine in the other medicine bottle. Pressing down the core rod pushes the rubber stopper 8 back to the initial position and pushes out the medicine.

[0045] In summary, by cooperating with the stop 3 set on the core rod and the blocking device 4 set on the top surface of the syringe 1, when the core rod drives the rubber stopper 8 to rise to the set height, the stop 3 abuts against the limiting part 402, thereby completing the extraction of a fixed dose of drug solution, thus accurately controlling the amount of liquid drawn by the syringe, and achieving the purpose of extracting a fixed dose of drug solution or accurately preparing the drug.

[0046] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0047] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A fixed dose syringe, characterized in that, The application relates to a needle cylinder and a core rod. The needle cylinder comprises a core rod which is slidably arranged inside the needle cylinder and is integrally formed by two or more core rod grids arranged at equal angles. A stop grid is arranged on the core rod and is located between two adjacent core rod grids. A blocking device is arranged on the top surface of the needle cylinder, and a limiting part is arranged on the side of the blocking device facing the core rod. The blocking device comprises one or more fixing sleeves arranged on the top surface of the needle cylinder, and one of the fixing sleeves is provided with the limiting part on the side facing the core rod.

2. A fixed dose syringe according to claim 1, wherein, One of the core rod grids is provided with a stop grid hole which penetrates one side of the stop grid and is located above the stop grid.

3. A fixed dose syringe according to claim 2, wherein, When the top surface of the stop grid abuts against the bottom surface of the limiting part, the height position of the stop grid hole relative to the needle cylinder is consistent with the height position of the limiting part relative to the needle cylinder, and the thickness of the limiting part is smaller than the height of the stop grid hole.

4. A fixed dose syringe according to claim 3, wherein, The limiting part and the stop grid are both in the shape of a sector.

5. A fixed dose syringe according to claim 1, wherein, The upper end of the needle cylinder is symmetrically provided with one or more handles, the fixing sleeve is provided with a mounting groove on the side facing the core rod, and the mounting groove is connected with the handle in a sleeved mode.

6. A fixed dose syringe according to claim 2, wherein, The top surface of the handle is provided with a positioning groove, the top surface of the mounting groove is provided with a positioning boss, and the positioning boss is connected with the positioning groove in a clamping mode.

7. A fixed dose syringe according to claim 6, wherein, The top surface of the handle is provided with a plug hole, the lower part of the blocking device is provided with an elastic hook, and the elastic hook is connected with the plug hole in a clamping mode.

8. A fixed dose syringe according to claim 6, wherein, The lower end of the core rod is provided with a rubber plug, and the outer wall of the rubber plug is attached to the inner wall of the needle cylinder.

9. A fixed dose syringe according to any one of claims 1-8, wherein, At least one stop grid is arranged on the core rod, and two adjacent stop grids are not located on the same projection plane along the length direction of the core rod.

10. A fixed dose syringe according to any one of claims 1-8, wherein, ​

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