Injector capable of accurately extracting dosage

Abstract

The utility model provides an injector capable of accurately extracting dosage, which relates to the field of medical instruments and comprises a syringe (10), a piston (20), a needle (30), a push rod (40), a pressing block (50) and a limiting component. Ribs (11) parallel to the axis of the push rod (40) are arranged on the outer walls of the two sides of the syringe (10) respectively, and the limiting assembly comprises a semi-annular sliding block (61), a connecting spring (62), a connecting rod (63) and a limiting block (64). The syringe can accurately control the extraction dosage according to the medication requirement, and therefore the problems that in the medicine extraction process, the dosage is inaccurate due to the fact that the dosage is judged manually, the human influence factor is large, the medicine extraction efficiency is low, and medicine leakage is likely to happen are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a syringe for accurately extracting dosage. Background Art

[0002] A syringe is a conventional medical device, which is mainly used to inject drugs or other liquids into the human body to achieve the purpose of treatment or enhancing the body's immune ability. At present, the syringe mainly consists of a syringe barrel, a piston, a needle and a protective cap, and has the characteristics of high precision, good sealing performance, being able to inject different drug doses, and convenient operation. Chinese patent document CN208658992U discloses a precision filtration syringe. By setting a filtration component, when in use, when the injection needle tube is extended or inserted into the medicine bottle and the push rod is retracted to extract the liquid medicine, under the action of the liquid medicine pressure, the liquid outlet groove is closed, and the outer edge of the elastic liquid blocking piece bends towards the lower filtration shell, and the liquid medicine enters the cylinder through the liquid inlet channel. When the push rod is pushed to inject the liquid medicine, under the action of the liquid medicine pressure, the liquid outlet groove opens, and the outer edge of the elastic liquid blocking piece fits tightly with the upper filtration shell, and the liquid medicine enters the injection needle through the precision filtration membrane and the filtered liquid outlet channel to achieve the purpose of injection. That is, the liquid medicine is not filtered when extracting the liquid medicine, which can save the medicine extraction time, and the liquid medicine is filtered when pushing the liquid medicine, which can effectively filter the impurities in the liquid medicine, so that no impurities will appear between the lower liquid outlet hole and the precision filtration membrane, preventing the impurities from being injected into the patient's body and reducing the probability of thrombosis to ensure the medication safety of the patient. However, in the daily process of using injection drugs, there are often problems such as inaccurate extraction dosage and large human influence factors (for example, one vial of dexamethasone is 1 ml and 5 mg. If the doctor's order dosage is 6 mg, then more than one vial of dexamethasone needs to be extracted, and it is necessary for the operator to control the dosage exceeding one vial during the extraction process, which requires high experience of the operator and large human-induced errors). At the same time, observing the extraction dosage while extracting the medicine is extremely likely to affect the extraction efficiency and increase the risk of medicine leakage. Summary of the Utility Model

[0003] Aiming at the above problems existing in the prior art, the purpose of the utility model is to provide a syringe for accurately extracting dosage, which can accurately control the extraction dosage according to the medication requirements, so as to effectively avoid problems such as inaccurate dosage, large human influence factors, low extraction efficiency of the medicine, and easy leakage of the medicine during the process of extracting the medicine.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] A syringe for accurately extracting dosage, comprising a syringe barrel, a piston, a needle, a push rod, a pressing block and a limiting component. The piston is slidably arranged inside the syringe barrel, and one end face of the piston is fixedly provided with a push rod. The end of the push rod away from the piston penetrates through the corresponding side wall of the syringe barrel, and a positioning ring is sleeved (fixedly) on the outer wall of the push rod located outside the syringe barrel. The end of the push rod away from the piston is fixedly provided with a pressing block, and a needle is arranged on the side of the syringe barrel away from the push rod. On the outer walls of both sides of the syringe barrel, convex ribs parallel to the axis of the push rod are respectively fixedly provided. The limiting component comprises semi-circular sliders, connecting springs, connecting rods and limiting blocks. The semi-circular sliders are two symmetrically arranged, and their middle parts are respectively slidably clamped on the corresponding convex ribs. The two semi-circular sliders are connected by a plurality of connecting springs, and connecting rods are respectively arranged at both ends of the side surface of the semi-circular slider away from the needle. The end of the connecting rod away from the semi-circular slider is connected to the limiting block. The limiting block is located on the side of the positioning ring away from the syringe barrel, and the middle part of the limiting block is penetrated by the push rod.

[0006] Based on the further optimization of the above scheme, the outer diameter of the positioning ring is smaller than the outer diameter of the syringe barrel, and the outer diameter of the limiting block is larger than the outer diameter of the syringe barrel.

[0007] Based on the further optimization of the above scheme, a limiting convex block is arranged at the end of the convex rib away from the limiting block to prevent the semi-circular slider from sliding out of the convex rib; an injection handle is arranged at the end of the convex rib close to the limiting block, which can prevent the semi-circular slider from sliding out of the convex rib and is convenient for pulling the piston during the process of drawing medicine and injection.

[0008] Based on the further optimization of the above scheme, the connecting rod penetrates through the injection handle, and an offset hole is provided on the injection handle corresponding to the connecting rod; the end of the connecting rod away from the semi-circular slider is slidably connected to the side surface of the limiting block close to the positioning ring.

[0009] Based on the further optimization of the above scheme, a through groove is provided on the semi-circular slider corresponding to the convex rib, and the outer wall of the convex rib is slidably connected to the inner wall of the through groove, so as to realize the sliding of the semi-circular slider on the corresponding convex rib; an anti-slip rubber block is fixedly arranged at the bottom of the through groove (that is, anti-slip lines are evenly arranged on the side surface of the rubber block close to the convex rib).

[0010] Based on the further optimization of the above scheme, the semi-circular sliders are connected and fixed to each other through "U"-shaped blocks. Specifically, clamping grooves are respectively provided on both ends of the side surface of the semi-circular slider away from the connecting spring, and positioning pins are provided on both side walls inside the "U"-shaped block corresponding to the clamping grooves. The two semi-circular sliders are connected and fixed by the positioning pins being clamped in the corresponding clamping grooves.

[0011] Based on the further optimization of the above scheme, scale lines are evenly arranged on the outer wall of the injection tube.

[0012] The following are the technical effects of the present utility model:

[0013] In this application, the control of the dosage of the extracted medicine is realized by the sliding of two semi-circular sliders on the corresponding convex ridges, that is, through the combination between the two semi-circular sliders, the semi-circular sliders are fixedly positioned on the corresponding scale lines on the outer wall of the syringe barrel; during the sliding process of the two semi-circular sliders on the convex ridges, the corresponding connecting rod is used to push the limiting block to move towards the side away from the positioning ring. When the two semi-circular sliders are combined and positioned, the limiting block is correspondingly fixed. During the extraction process, when the positioning ring is blocked by the limiting block, due to the limitation of the limiting block, the positioning ring cannot move further, thereby completing the control of the extraction dosage. The entire structure of this application is simple and easy to operate, and can effectively achieve the precise control of the dosage of the extracted medicine, avoiding problems such as low precision, large human error, and low extraction efficiency caused by manual control of the dosage, and also avoiding the problem of medicine leakage caused by manual observation during liquid extraction. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the syringe in the embodiment of the present utility model.

[0015] Figure 2 It is Figure 1 the A-A cross-sectional view of

[0016] Figure 3 It is Figure 2 the B-B cross-sectional view of

[0017] Figure 4 It is Figure 3 the C-C cross-sectional view of

[0018] Figure 5 It is a schematic diagram of the usage state of the syringe in the embodiment of the present utility model (relative to Figure 2 ).

[0019] Among them, 10, syringe barrel; 11, convex ridge; 110, limiting convex block; 12, injection handle; 120, offset hole; 20, piston; 30, needle; 40, push rod; 41, positioning ring; 50, pressing block; 61, semi-circular slider; 611, through groove; 612, anti-slip rubber block; 613, card slot; 62, connecting spring; 63, connecting rod; 64, limiting block; 70, "U"-shaped clamping block; 71, positioning pin. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0021] Embodiment 1:

[0022] A syringe for accurately extracting dosage, comprising a syringe barrel 10, a piston 20, a needle 30, a push rod 40, a pressing block 50 and a limiting component. The outer wall of the syringe tube 10 is evenly provided with scale lines (such as Figure 1 shown); the piston 20 is slidably arranged inside the syringe barrel 10 (that is, the outer wall of the piston 20 is slidably connected to the inner wall of the syringe barrel 10), and one side of the piston 20 (that is, Figure 1 the right side shown) is fixedly provided with a push rod 40 at the end face (such as Figure 1 shown, the central axes of the syringe barrel 10, the piston 20 and the push rod 40 are collinear). The end of the push rod 40 away from the piston 20 penetrates through the corresponding side wall of the syringe barrel 10 (that is, Figure 1 the right side wall shown), and a positioning ring 41 is sleeved (fixed) on the outer wall of the push rod 40 located outside the syringe barrel 10 (such as Figure 1 shown); the end of the push rod 40 away from the piston 20 is fixedly provided with a pressing block 50 at the end ( Figure 1 the right end shown), and a needle 30 is provided on one side of the syringe barrel 10 away from the push rod 40 (that is, Figure 1 the left side shown) (see Figure 1 shown, the central axis of the needle 30 is collinear with the central axis of the syringe barrel 10).

[0023] On both sides of the syringe barrel 10 ( Figure 1 the upper and lower sides shown), convex ribs 11 parallel to the axis of the push rod 40 are respectively provided (fixed). The limiting component includes a semi-circular slider 61, a connecting spring 62, a connecting rod 63 and a limiting block 64. The semi-circular sliders 61 are two symmetrically arranged, and their middle parts are respectively slidably clamped on the corresponding convex ribs 11. The two semi-circular sliders 61 are connected by a plurality of connecting springs 62 (such as Figure 2 shown, a total of four connecting springs 62 are used in this application, and the two ends of the semi-circular slider 61 are respectively connected by two connecting springs 62), and connecting rods 63 are respectively arranged at both ends of the side surface of the semi-circular slider 61 away from the needle 30 (see Figure 2 shown, a total of four connecting rods 63 are arranged, and two are arranged on each semi-circular slider 61). The end of the connecting rod 63 away from the semi-circular slider 61 is connected to the limiting block 64 (that is, the four connecting rods 63 are connected to the same limiting block 64). See Figure 3 shown, the limiting block 64 is located on the side of the positioning ring 41 away from the syringe barrel 10 (that is, Figure 3 the right side shown), and the middle of the limiting block 64 is penetrated by the push rod 40 (the push rod 40 is slidably connected to the limiting block 64); the outer diameter of the positioning ring 41 is smaller than the outer diameter of the syringe barrel 10, and the outer diameter of the limiting block 64 is larger than the outer diameter of the syringe barrel 10 (such as Figure 3 shown). At the same time, the end of the convex rib 11 away from the limiting block 64 (that is, Figure 1A limit bump 110 (the limit bump 10 is fixedly connected to the outer wall of the syringe barrel 10) is provided at the left end as shown, for preventing the semi-circular slider 61 from sliding out of the convex rib 11; at the end of the convex rib 11 near the limit block 64 (i.e., Figure 1 the right end as shown), an injection handle 12 (the injection handle 12 is fixedly connected to the outer wall of the syringe barrel 10) is provided. One is to prevent the semi-circular slider 61 from sliding out of the convex rib 11, and the other is to facilitate pulling the piston 20 during the process of drawing medicine and injecting (i.e., facilitating the gripping of the hand). The connecting rod 63 penetrates through the injection handle 12, and the injection handle 12 is provided with an offset hole 120 corresponding to the connecting rod 63 (see Figure 4 shown. The length of the offset hole 120 is greater than the diameter of the connecting rod 63, and its width is the same as the diameter of the connecting rod 63. The connecting rod 63 can slide in the offset hole 120); the end of the connecting rod 63 away from the semi-circular slider 61 is slidably connected to the side surface of the limit block 64 close to the positioning ring 41 (i.e., the end of the connecting rod 63 is slidably clamped inside the side surface of the limit block 64).

[0024] The semi-circular slider 61 is provided with a through groove 611 corresponding to the convex rib 11 (as Figure 2 shown). The outer wall of the convex rib 11 is slidably connected to the inner wall of the through groove 611, so as to realize the sliding of the semi-circular slider 61 on the corresponding convex rib 11 (initially, the side wall of the convex rib 11 away from the syringe barrel 10 does not contact the bottom of the through groove 611, and the connecting spring 62 is in a compressed state, as Figure 2 shown); an anti-slip rubber block 612 is fixedly arranged at the bottom of the through groove 611 (i.e., anti-slip patterns are uniformly arranged on the side surface of the rubber block close to the convex rib 11, and at the same time, the rubber block has a certain elastic deformation).

[0025] As Figure 5 shown, the semi-circular sliders 61 are connected and fixed to each other through a "U"-shaped clamping block 70. Specifically: clamping grooves 613 are respectively opened on the side surfaces of both ends of the semi-circular slider 61 and away from the connecting spring 62 (see Figure 2 shown). Positioning pins 71 are arranged on the two side walls inside the "U"-shaped clamping block 70 corresponding to the clamping grooves 613. The connection and fixation between the two semi-circular sliders 61 are realized by the positioning pins 71 being clamped in the corresponding clamping grooves 613.

[0026] Working principle:

[0027] During use, first calibrate the syringe (i.e., when the piston 20 is at the bottom of the syringe barrel 10, adjust the semi-circular slider 61 to the "0" reference position of the scale line, and the limit block 64 abuts against the positioning ring 41, as Figure 1 or Figure 3 shown); then, according to the dosage of the medicine to be drawn, move the semi-circular slider 61 on the outer wall of the syringe barrel 10 towards Figure 1The right - hand sliding shown (at this time, the "U" - shaped clamping block 70 does not clamp the semi - circular slider 61) until the semi - circular slider 61 reaches the required scale line. At this time, the two semi - circular sliders 61 push the limit block 64 to move towards the Figure 1 right side shown; then, press the semi - circular sliders 61 with both hands simultaneously to make them approach each other. At this time, the connecting spring 62 is compressed, and the anti - slip rubber block 612 contacts the side wall of the corresponding convex rib 11. Continue to press the semi - circular sliders 61, and the anti - slip rubber block 612 is squeezed and deformed; then, respectively, snap the "U" - shaped clamping block 70 onto the corresponding ends of the semi - circular sliders 61, and release the semi - circular slider 612. Due to the acting force of the connecting spring 62 and the deformation recovery force of the anti - slip rubber block 612, the positioning pin 71 is inserted into the corresponding card slot 613, realizing the connection of the two semi - circular sliders 61. At this time, through the contact between the anti - slip rubber block 612 and the convex rib 11, the scale line positioning of the semi - circular slider 61 is realized. Finally, pull the piston 20 through the push rod 40 to extract the medicine. When the positioning ring 641 reaches the limit block 64, the specified dosage is reached, and the pulling is stopped, thereby realizing the precise control of the extraction amount and avoiding the artificial judgment of the extraction dosage.

[0028] Embodiment 2:

[0029] As a further optimization of the solution of the present utility model, on the basis of the solution of Embodiment 1, in order to ensure the friction force when the convex rib 11 contacts the anti - slip rubber block 612, and thus improve the positioning stability after the connection of the two semi - circular sliders 61, a plurality of anti - slip teeth are uniformly arranged on the side wall of the convex rib 11 away from the syringe barrel 10 and along the axis direction of the syringe barrel 10. The anti - slip teeth are horizontally distributed on the surface of the convex rib 11.

[0030] Embodiment 3:

[0031] As a further optimization of the solution of the present utility model, the anti - slip rubber block 611 on the inner wall of the through - slot 611 in Embodiment 1 is replaced by a protruding positioning block. A plurality of positioning holes are uniformly arranged on the side wall of the convex rib 11 away from the syringe barrel 10 corresponding to the scale lines and corresponding to the positioning blocks. The position of the semi - circular slider 61 is fixed by inserting the positioning block into the positioning hole corresponding to the scale line.

Claims

1. A syringe for accurately extracting dosage, characterized in that: It includes a syringe, a piston, a needle, a push rod, a pressing block and a limit assembly. The piston is slidably arranged inside the syringe and a push rod is fixedly arranged on one end face of the piston. The end of the push rod away from the piston penetrates the corresponding side wall of the syringe and the outer wall located on the outside of the syringe is sleeved with a positioning ring; a pressing block is arranged at the end of the push rod away from the piston, and a needle is arranged on the side of the syringe away from the push rod; convex ridges parallel to the axis of the push rod are respectively arranged on the outer walls of both sides of the syringe, and the limit assembly includes a semi-annular slider, a connecting spring, a connecting rod and a limit block. There are two semi-annular sliders symmetrically arranged and the middle of them are respectively slidably engaged on the corresponding convex ridges. The two semi-annular sliders are connected by a plurality of connecting springs and connecting rods are respectively arranged at both ends of the side of the semi-annular slider away from the needle. The end of the connecting rod away from the semi-annular slider is connected to the limit block, and the limit block is located on the side of the positioning ring away from the syringe and the middle part is penetrated by the push rod.

2. A syringe for accurately extracting dosage according to claim 1, characterized in that: The outer diameter of the positioning ring is smaller than the outer diameter of the injection barrel, and the outer diameter of the limiting block is larger than the outer diameter of the injection barrel.

3. The syringe for accurately extracting dosage according to claim 1, characterized in that: A limiting convex block is arranged at one end of the convex ridge away from the limiting block; and an injection handle is arranged at one end of the convex ridge close to the limiting block.

4. The syringe for accurately extracting dosage according to claim 3, characterized in that: The connecting rod passes through the injection handle and the injection handle is provided with an offset hole corresponding to the connecting rod; an end of the connecting rod away from the semi-circular sliding block is slidably connected to a side surface of a limiting block located close to the positioning ring.

5. The syringe for accurately extracting dosage according to claim 1, characterized in that: The semi-annular sliding block is provided with a through groove corresponding to the convex ridge, and the outer wall of the convex ridge is slidably connected with the inner wall of the through groove; and an anti-skid rubber block is fixedly arranged at the bottom of the through groove.

6. The syringe for accurately extracting dosage according to claim 1, characterized in that: The semi-annular sliders are connected and fixed to each other through a "U"-shaped clamping block. Specifically, clamping grooves are respectively provided on the sides of the two ends of the semi-annular slider and away from the connecting spring, and positioning pins are provided on the side walls on both sides of the inner side of the "U"-shaped clamping block corresponding to the clamping grooves.

7. The syringe for accurately extracting dosage according to claim 1, characterized in that: The outer wall of the injection barrel is evenly provided with scale lines.

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