Injector with adjustable injection amount

Abstract

The utility model belongs to the technical field of injection, and particularly relates to an injection-volume-adjustable injector which comprises an injection push rod, an injection tube, an injection tube and an injection tube, the distances between the positioning grooves are equal; a clamping piece which is as wide as the positioning groove is arranged at one end, close to the injection push rod, of the driving push rod; the clamping piece is suitable for being clamped into a positioning groove formed in the outer wall of the injection push rod, so that when the driving push rod is pushed, the injection push rod is driven to slide on the inner wall of the injector, and quantitative liquid is discharged; a plurality of positioning grooves are evenly formed in the injection push rod, after the injection push rod slides in the injector to extract liquid and enters the injector, the push rod is driven to slide on the surface of the injection push rod, the gaps between the positioning grooves are equal, the amount of discharged liquid is equal when the injection push rod moves by the distance of one gap, and the injection push rod is controlled through a mechanical structure. And compared with visual inspection of an operator, the injection amount is more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection, and particularly relates to an adjustable injection volume syringe. Background Art

[0002] Conventional syringes usually have dose marking lines on the barrel. When in use, the operator observes with the naked eye and aligns the distal end of the plunger with the corresponding dose marking line on the barrel before and after injection to discharge the required injection dose. Especially for small-volume syringes, for example, during experiments, quantitative injection is required to ensure the accuracy of experimental data. However, due to factors such as the observation angle and the intensity of light, it is difficult for the operator to accurately position the distal end of the plunger to align it with the corresponding dose marking line, resulting in inaccurate injection dose.

[0003] Therefore, an adjustable injection volume syringe is designed to solve the technical problem that the accuracy of the injection volume cannot be guaranteed by visual observation in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an adjustable injection volume syringe to solve the above technical problems.

[0005] To solve the above technical problems, the utility model provides an adjustable injection volume syringe, including: an injection push rod, on the outer wall of which several positioning grooves are opened; wherein

[0006] The distances between the positioning grooves are equal; and

[0007] A driving push rod, at one end close to the injection push rod, is provided with a clamping member having the same width as the width of the positioning groove; wherein

[0008] The clamping member is adapted to be inserted into the positioning groove opened on the outer wall of the injection push rod, so as to drive the injection push rod to slide on the inner wall of the syringe when the driving push rod is pushed, and discharge a fixed amount of liquid.

[0009] Further, a lower clamping portion is provided on the outer wall of the syringe; wherein

[0010] A liquid extraction mechanism is provided on the lower clamping portion, which includes:

[0011] A lead screw, which is arranged inside the injection push rod and is threadedly connected with the injection push rod;

[0012] A driven gear, which is arranged on the lead screw; and

[0013] A rotating assembly, which is connected with the driven gear and is adapted to drive the driven gear to rotate.

[0014] Further, the rotating assembly includes:

[0015] The rotating shaft penetrates through the lower clamping part; wherein

[0016] One end of the rotating shaft is provided with a driving gear, and the driving gear meshes with a driven gear; and

[0017] The other end of the rotating shaft is provided with a knob.

[0018] Furthermore, a fixing member is arranged on the lower clamping part; wherein

[0019] The fixing member is connected to the center of the end face of the driven gear away from the lead screw by a bearing.

[0020] Furthermore, an upper clamping part is connected to the end of the lower clamping part away from the syringe by a bearing; wherein

[0021] A receiving cavity is formed in the upper clamping part, so that when the upper clamping part rotates around its bearing connection with the lower clamping part and approaches the lower clamping part, the driving push rod can be received; and

[0022] One end of the driving push rod away from the injection push rod is connected to the inner wall of the receiving cavity by a bearing.

[0023] Furthermore, a sliding groove is formed in the upper end face of the upper clamping part; wherein

[0024] A driving magnetic block is slidably connected in the sliding groove; and

[0025] An expansion rod, one end of which is connected to the inner wall of the sliding groove and the other end is connected to the driving magnetic block;

[0026] A return spring is sleeved on the outer wall of the expansion rod.

[0027] Furthermore, a driven magnetic block is arranged inside the driving push rod; wherein

[0028] The driven magnetic block is adapted to be mutually adsorbed with the driving magnetic block when the driving push rod is received in the receiving cavity.

[0029] Furthermore, a piston member is arranged at one end of the injection push rod located inside the syringe.

[0030] The beneficial effect of the present utility model is that by uniformly arranging a plurality of positioning grooves on the injection push rod, after the injection push rod slides in the syringe to draw liquid into the syringe, the driving push rod slides on the surface of the injection push rod. The gaps between each positioning groove are equal, and when the injection push rod moves a distance equal to one gap, the discharged liquid volume is equal. Therefore, only by clamping one end of the driving push rod into a certain positioning groove and then using the driving push rod to push the injection push rod to slide in the syringe, the required amount of liquid can be discharged. Controlled by a mechanical structure, the injection volume is more accurate compared to the operator observing with the naked eye.

[0031] Other features and advantages of the present utility model will be described in the subsequent description, and in part, will become apparent from the description, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the description and the drawings.

[0032] To make the above objectives, features, and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. Brief Description of the Drawings

[0033] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 is the first perspective three-dimensional view of the present utility model;

[0035] Figure 2 is the cross-sectional view of the present utility model;

[0036] Figure 3 is of the present utility model Figure 2 amplified structural schematic diagram of part A;

[0037] Figure 4 is the second perspective three-dimensional view of the present utility model;

[0038] Figure 5 is of the present utility model Figure 4 amplified structural schematic diagram of part B.

[0039] In the figures:

[0040] 1. Syringe:

[0041] 2. Lower clamping part;

[0042] 3. Upper clamping part; 30. Slide groove; 31. Active magnetic block; 32. Return spring; 33. Telescopic rod; 34. Driving push rod; 340. Driven magnetic block;

[0043] 4. Injection push rod; 40. Lead screw; 41. Active magnetic block; 42. Driven magnetic block; 43. Fixed part; 44. Rotating shaft; 45. Knob; 46. Piston part. Detailed Embodiments

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0045] Traditional syringes usually have dose marking lines on the barrel. When in use, the operator observes with the naked eye to align the distal end of the plunger with the corresponding dose marking line on the barrel before and after injection to discharge the required injection dose. Especially for small-volume syringes, for example, during experiments, quantitative injection is required to ensure the accuracy of experimental data. However, due to factors such as the observation angle and the intensity of light, it is difficult for the operator to accurately position the distal end of the plunger to align it with the corresponding dose marking line, resulting in inaccurate injection doses.

[0046] To solve the above technical problems, in at least one embodiment, an adjustable injection volume syringe is provided, including: an injection push rod 4, on the outer wall of which a plurality of positioning grooves are opened; the spacing between each positioning groove is equal; and a driving push rod 34, at one end close to the injection push rod 4, a clamping member equal in width to the groove width of the positioning groove is provided; the clamping member is adapted to be inserted into the positioning groove opened on the outer wall of the injection push rod 4, so as to drive the injection push rod 4 to slide on the inner wall of the syringe when the driving push rod 34 is pushed, and discharge a fixed amount of liquid.

[0047] By evenly opening a plurality of positioning grooves on the injection push rod 4, after the injection push rod 4 slides in the syringe 1 to draw liquid into the syringe 1, the driving push rod 34 is used to slide on the surface of the injection push rod 4. The gap between each positioning groove is equal, and when the injection push rod 4 moves a distance equal to one gap, the amount of liquid discharged is equal. Therefore, only by clamping one end of the driving push rod 34 into a certain positioning groove, and then using the driving push rod 34 to push the injection push rod 4 to slide in the syringe 1, the required amount of liquid can be discharged. Controlled by a mechanical structure, the injection volume is more accurate compared to using the operator's naked-eye observation.

[0048] In some embodiments, as Figures 1 to 3 shown, before starting the injection, the port of the syringe is inserted into the liquid, and the operator manually rotates the knob 45 to drive the rotation of the rotating shaft 44 and the driving gear 42. The driving gear 42 drives the driven gear 41 meshing with it to rotate, and further drives the lead screw 40 fixed in the center of the driven gear 41 to rotate. The lead screw 40 extends into the inside of the injection push rod 4 and is threadedly engaged with the injection push rod 4. Therefore, as the lead screw 40 rotates, it drives the injection push rod 4 to slide inside the syringe 1, and the piston member 46 is used to draw the liquid into the inside of the syringe 1.

[0049] In some embodiments, Figures 4 to 5 As shown, the initial state of the upper clamping part 3 is to fit with the lower clamping part 2. At this time, the driving push rod 34 is accommodated in the accommodating chamber 35. The active magnetic block 31 set on the upper end surface of the upper clamping part 3 uses magnetic force to attract the driven magnetic block 340 embedded in the upper end surface of the driving push rod 34. When the liquid is extracted, the upper clamping part 3 is manually moved to rotate around the bearing connection with the lower clamping part 2, and then the active magnetic block 31 is pushed to slide in the slide groove 30 to move away from the driven magnetic block 340. At this time, the driven magnetic block 340 loses its adsorption force, that is, the driving push rod 34 deflects around the bearing connection between it and the inner wall of the accommodating chamber 35. The end of the start rod 34 close to the injection push rod 4 is provided with a clamping piece, and the width of the clamping piece is The length is equal to the groove width of the positioning groove opened on the injection push rod 4, and the spacing between each adjacent positioning grooves is the same, that is, the amount of liquid discharged is the same every time the injection push rod 4 is pushed to move a distance of the spacing. According to the required injection volume, the upper clamping part 3 is pushed to rotate, driving the end of the driving push rod 34 close to the injection push rod 4 to slide on the injection push rod 4, so that the clamping part is stuck in a certain positioning groove, and then the upper clamping part 3 is pushed in the reverse direction to push the driving push rod 34 to move, thereby pushing the injection push rod 4 to slide in the syringe 1 to discharge the required amount of liquid. When the end of the injection push rod 4 provided with the clamping part contacts one end surface of the syringe, the driving push rod 4 can no longer push the injection push rod 4 to move.

[0050] To summarize, by evenly opening a number of positioning grooves on the injection push rod, when the injection push rod slides in the syringe to draw liquid into the syringe, the driving push rod is used to slide on the surface of the injection push rod. The gap between each positioning groove is equal, and when the injection push rod moves a distance of a gap, the amount of liquid discharged is equal. Therefore, it is only necessary to insert one end of the driving push rod into a positioning groove, and then use the driving push rod to push the injection push rod to slide in the syringe to discharge the required amount of liquid. Through mechanical structure control, the injection amount is more accurate than using the operator's naked eye observation.

[0051] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0053] Taking the above-mentioned ideal embodiment of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A syringe with adjustable injection volume, characterized in that: include: The injection push rod has a plurality of positioning grooves on its outer wall; in The spacing between the positioning grooves is equal; as well as The driving push rod has a clamping piece with a width equal to that of the positioning groove at one end thereof close to the injection push rod; The clamping piece is suitable for being clamped into a positioning groove provided on the outer wall of the injection push rod, so that when the driving push rod is pushed, the injection push rod is driven to slide on the inner wall of the syringe to discharge a fixed amount of liquid.

2. The adjustable injection volume syringe according to claim 1, characterized in that: A lower clamping portion is provided on the outer wall of the syringe; in The lower clamping portion is provided with a liquid extraction mechanism, which comprises: A screw rod is arranged inside the injection push rod and is threadedly connected to the injection push rod; A driven gear is disposed on the lead screw; and The rotating assembly is connected to the driven gear and is suitable for driving the driven gear to rotate.

3. The adjustable injection volume syringe according to claim 2, characterized in that: The rotating assembly comprises: The rotating shaft passes through the lower clamping part; A driving gear is disposed at one end of the rotating shaft, and the driving gear is meshed with a driven gear; and The other end of the rotating shaft is provided with a knob.

4. The adjustable injection volume syringe according to claim 3, characterized in that: The lower clamping portion is provided with a fixing member; wherein The fixing member is connected to a central bearing of an end surface of the driven gear away from the screw rod.

5. The adjustable injection volume syringe according to claim 4, characterized in that: The upper bearing at one end of the lower clamping part away from the syringe is connected to the upper clamping part; The upper clamping part is provided with a receiving cavity to receive the driving push rod when the upper clamping part rotates around the bearing connection between the upper clamping part and the lower clamping part to approach the lower clamping part; and One end of the driving push rod away from the injection push rod is connected to the inner wall bearing of the housing.

6. The adjustable injection volume syringe according to claim 5, characterized in that: The upper end surface of the upper clamping portion is provided with a slide groove; wherein An active magnetic block is slidably connected in the slide groove; and A telescopic rod, one end of which is connected to the inner wall of the slideway, and the other end of which is connected to the active block; A return spring is sleeved on the outer wall of the telescopic rod.

7. The adjustable injection volume syringe according to claim 6, characterized in that: A driven magnetic block is arranged inside the driving push rod; The driven magnetic block is suitable for being attracted to the active magnetic block when the driving push rod is received in the accommodating cavity.

8. The adjustable injection volume syringe according to claim 7, characterized in that: A piston is arranged at one end of the injection push rod located inside the syringe.

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