50mL injector capable of directly and accurately sucking small-dose liquid medicine

Abstract

The invention discloses a 50 mL injector capable of directly and accurately sucking small-dose liquid medicine. The 50 mL injector comprises a 50 mL sleeve, a 1 mL sleeve, a conical head, a turned edge and a piston assembly. According to the device, a 1mL sleeve is additionally arranged at the front end of a normal 50mL sleeve, so that a medical worker can directly suck a small dose of liquid medicine by observing scale marks in the 1mL sleeve; according to the device, a 1mL piston is arranged in a 50mL piston, and when the 50mL piston is pushed to the bottom of a 50mL sleeve, the 1mL piston can be continuously pushed to completely discharge liquid medicine in the 1mL sleeve; in addition, in order to solve the problem that the volume of liquid discharged by the 1mL piston is far smaller than that of liquid discharged by the 50mL piston when the microinjection pump controls the 1mL piston to move by the same distance as that of the 50mL piston, the device is provided with a set of stroke amplification assembly for the 1mL piston, so that the 1mL piston can move by a large stroke when the pressing hand is pushed by a small stroke, and the liquid discharged by the 50mL piston can be discharged by a small stroke. Therefore, the device can be ensured to reasonably and normally work in the micro-injection pump.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a 50 mL syringe that can directly and precisely aspirate a small dose of liquid medicine. Background Art

[0002] In clinical work, it is often necessary to use a 50 mL syringe to configure the medicine and then place it in a micro-infusion pump for slow injection of the medicine. Currently, the smallest scale of the 50 mL syringe on the market is 2 mL. When the volume of the medicine to be added is <2 mL, there is a situation of inaccurate aspiration. This forces nursing staff to have to use small-capacity syringes such as 1 mL and 2 mL to aspirate the medicine well and then inject it into the 50 mL syringe through the needles of both. This is not only time-consuming and laborious, increasing costs, but more importantly, there are nosocomial infection problems, which are likely to cause liquid medicine contamination and the risk of needle stick injuries to medical staff.

[0003] Therefore, there is a need for a 50 mL syringe that can directly and precisely aspirate a small dose of liquid medicine. In order to directly aspirate a small dose of liquid medicine and at the same time be compatible with most micro-infusion pumps on the market, on the basis of the existing shape of the 50 mL syringe, an additional injection tube with a volume of 1 mL and a display scale is added at the needle nipple, and the total capacity including the capacity at the nipple is 50 mL.

[0004] However, simply adding an additional 1 mL sleeve at the needle nipple and matching it with the piston of a normal 50 mL syringe will cause the liquid medicine in the 1 mL sleeve to not be completely pushed out by the piston, resulting in waste of the liquid medicine and not meeting the required dosage for the patient.

[0005] If a piston of a 1 mL syringe is added to the front end of the piston of the 50 mL syringe, since the cross-sectional area of the 50 mL sleeve is different from the cross-sectional area of the 1 mL sleeve, and the volume formula of a columnar liquid is the product of the cross-sectional area of the liquid and the liquid level height, and at the same time, the principle of the micro-infusion pump is also to control the volume of the liquid in the syringe by calculating the moving distance of the piston. Therefore, in this case, when the piston of the 1 mL syringe enters the 1 mL injection sleeve and the micro-infusion pump controls the 1 mL piston and the 50 mL piston to move the same distance, the volume of the liquid discharged by the 1 mL piston will be much smaller than the volume of the liquid discharged by the 50 mL piston. Summary of the Invention

[0006] To solve the above technical problems, the present invention designs a 50 mL syringe that can directly and accurately aspirate a small dose of liquid medicine. The device adds a 1 mL sleeve at the front end of a normal 50 mL sleeve, enabling medical staff to directly aspirate a small dose of liquid medicine by observing the scale line in the 1 mL sleeve. To ensure that the liquid medicine in the 1 mL sleeve is not wasted, a 1 mL piston is provided inside the 50 mL piston. When the 50 mL piston is pushed to the bottom of the 50 mL sleeve, the 1 mL piston can be further pushed to completely discharge the liquid medicine inside the 1 mL sleeve. Additionally, to solve the problem that when the micro-injection pump controls the 1 mL piston and the 50 mL piston to move the same distance, the volume of the liquid discharged by the 1 mL piston is much smaller than that discharged by the 50 mL piston, a stroke amplification component is provided for the 1 mL piston, such that when the push button is pushed a small stroke, the 1 mL piston will move a large stroke, thereby ensuring that the device can work properly and reasonably in the micro-injection pump.

[0007] To achieve the above technical effects, the present invention discloses a 50 mL syringe that can directly and accurately aspirate a small dose of liquid medicine, comprising: a 50 mL sleeve, a 1 mL sleeve, a conical head, a curled edge, and a piston assembly; the 1 mL sleeve is fixedly arranged at the front end of the 50 mL sleeve; the conical head is fixedly arranged at the front end of the 1 mL sleeve; the curled edge is fixedly arranged at the end of the 50 mL sleeve; the piston assembly is slidably sleeved inside the 50 mL syringe;

[0008] Further, the piston assembly comprises: a 1 mL piston, a 50 mL piston, a spring, a push button, a first rack, a second rack, a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, and a gear plate; the 1 mL piston is slidably sleeved inside the 50 mL piston; the end of the 1 mL piston is fixedly connected to the first rack; the second rack is fixedly arranged inside the 50 mL piston; the gear plate is slidably arranged inside the 50 mL piston; the first gear, the second gear, the third gear, the fourth gear, the fifth gear, and the sixth gear are respectively rotatably connected to the gear plate; the end of the gear plate is fixedly connected to the push button; one end of the spring is fixedly connected to the push button, and the other end of the spring is fixedly connected to the end of the 50 mL piston;

[0009] Further, the first gear is coaxially and synchronously connected to the second gear; the third gear is coaxially and synchronously connected to the fourth gear; the fifth gear is coaxially and synchronously connected to the sixth gear; the first rack meshes with the first gear; the second gear meshes with the third gear; the fourth gear meshes with the fifth gear, and the sixth gear meshes with the second rack;

[0010] Further, the module numbers of the first rack, the second rack, the first gear, the second gear, the third gear, the fourth gear, the fifth gear, and the sixth gear are exactly the same; the tooth numbers of the second gear, the fourth gear, and the sixth gear are exactly the same.

[0011] The beneficial effects of the present invention are as follows:

[0012] The present invention discloses a 50 mL syringe capable of directly and accurately aspirating a small dose of liquid medicine. By integrating a 1 mL sleeve and a piston assembly, medical staff can directly observe and accurately control the aspiration and injection of a small dose of liquid medicine. It can improve the accuracy of the liquid medicine, simplify the operation process, and reduce the errors and risks that may occur when medical staff aspirate a small dose of liquid medicine. At the same time, the device can also reduce the waste of liquid medicine because the 1 mL piston can completely discharge the liquid medicine in the 1 mL sleeve, avoiding the drawback that the liquid medicine may remain at the bottom of the sleeve and cannot be completely used.

[0013] In addition, the device can be normally matched with common micro-injection pumps on the market. After fixing and installing this device on the micro-injection pump, the micro-injection pump first pushes the entire top end of the 50 mL sleeve of the piston assembly to move. At this time, the working principle of this device is the same as that of a normal 50 mL sleeve. When the piston assembly is pushed into the top of the 50 mL sleeve, the entire piston assembly can no longer be pushed at this time. The spring provided at the end of the 50 mL piston is compressed and pushes the gear set and the gear plate to move into the 50 mL piston, and finally drives the 1 mL piston to move inward. Due to the stroke amplification function of the gear set, when the micro-injection pump pushes the push handle to move inward for a small stroke at this time, the 1 mL piston can move inward for a large stroke. When the push handle moves the same distance in the 50 mL sleeve and in the 1 mL sleeve, the volume of the discharged liquid is the same. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below.

[0015] Figure 1 is an overall structural schematic diagram of a 50 mL syringe capable of directly and accurately aspirating a small dose of liquid medicine;

[0016] Figure 2 is a structural schematic diagram of the piston assembly of a 50 mL syringe capable of directly and accurately aspirating a small dose of liquid medicine;

[0017] Figure 3 is a structural schematic diagram of the internal components of the 50 mL piston of a 50 mL syringe capable of directly and accurately aspirating a small dose of liquid medicine;

[0018] Figure 4Another structural schematic diagram of the inner component of the 50 mL piston of a 50 mL syringe that can directly and accurately aspirate a small dose of liquid medicine;

[0019] Figure 5 Perspective view of a 50 mL syringe that can directly and accurately aspirate a small dose of liquid medicine;

[0020] In the attached drawings, the list of components represented by each label is as follows:

[0021] 1 - 50 mL sleeve, 2 - 1 mL sleeve, 3 - tapered head, 4 - crimp, 5 - piston assembly, 501 - 1 mL piston, 502 - 50 mL piston, 503 - spring, 504 - push button, 505 - first rack, 506 - second rack, 507 - first gear, 508 - second gear, 509 - third gear, 5010 - fourth gear, 5011 - fifth gear, 5012 - sixth gear, 5013 - gear plate. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Embodiment 1

[0024] The present invention discloses a 50 mL syringe that can directly and accurately aspirate a small dose of liquid medicine. Refer to Figures 1 to 5 , including: 50 mL sleeve 1, 1 mL sleeve 2, tapered head 3, crimp 4, piston assembly 5; the 1 mL sleeve 2 is fixedly arranged at the front end of the 50 mL sleeve 1; the tapered head 3 is fixedly arranged at the front end of the 1 mL sleeve 2; the crimp 4 is fixedly arranged at the end of the 50 mL sleeve 1; the piston assembly 5 is slidably sleeved inside the 50 mL syringe;

[0025] The piston assembly 5 includes: 1 mL piston 501, 50 mL piston 502, spring 503, push button 504, first rack 505, second rack 506, first gear 507, second gear 508, third gear 509, fourth gear 5010, fifth gear 5011, sixth gear 5012, and gear plate 5013; the 1 mL piston 501 is slidably sleeved inside the 50 mL piston 502; the end of the 1 mL piston 501 is fixedly connected to the first rack 505; the second rack 506 is fixedly arranged inside the 50 mL piston 502; the gear plate 5013 is slidably arranged inside the 50 mL piston 502; the first gear 507, second gear 508, third gear 509, fourth gear 5010, fifth gear 5011, and sixth gear 5012 are respectively rotatably connected to the gear plate 5013; the end of the gear plate 5013 is fixedly connected to the push button 504; one end of the spring 503 is fixedly connected to the push button 504, and the other end of the spring 503 is fixedly connected to the end of the 50 mL piston 502;

[0026] The first gear 507 is coaxially and synchronously connected to the second gear 508; the third gear 509 is coaxially and synchronously connected to the fourth gear 5010; the fifth gear 5011 is coaxially and synchronously connected to the sixth gear 5012; the first rack 505 meshes with the first gear 507; the second gear 508 meshes with the third gear 509; the fourth gear 5010 meshes with the fifth gear 5011, and the sixth gear 5012 meshes with the second rack 506;

[0027] The module of the first rack 505, second rack 506, first gear 507, second gear 508, third gear 509, fourth gear 5010, fifth gear 5011, and sixth gear 5012 is exactly the same; the number of teeth of the second gear 508, fourth gear 5010, and sixth gear 5012 is exactly the same.

[0028] Embodiment 2

[0029] In this embodiment, in order to ensure the accuracy of the transmission ratio of the gear set, the number of teeth of the first gear 507, second gear 508, third gear 509, fourth gear 5010, fifth gear 5011, and sixth gear 5012 needs to satisfy the following relationship:

[0030] (Number of teeth of the first gear * Number of teeth of the third gear * Number of teeth of the fifth gear) / (Number of teeth of the second gear * Number of teeth of the fourth gear * Number of teeth of the sixth gear) = (Inner diameter of the 50 mL sleeve / Inner diameter of the 1 mL sleeve)².

[0031] The working principle and usage process of this device are as follows:

[0032] First, when aspirating the liquid medicine, if the volume of the medicine to be added is < 2 mL, medical staff can directly pull the pressing hand 504 and precisely aspirate the liquid medicine by observing the precise graduation lines of the 1 mL sleeve 2; for the remaining liquid medicine, it can be directly aspirated by observing the graduation of the 50 mL sleeve 1.

[0033] Next, fix the crimped edge 4 and the pressing hand 504 of the device to the micro-injection pump respectively and connect the infusion tube to the push head of the device, then the micro-injection pump can be started. At this time, the micro-injection pump will push the pressing hand 504 to move inward. Due to the elastic force of the spring 503, the entire piston assembly 5 will move together towards the top of the 50 mL sleeve 1. At this time, the working principle of this device is the same as that of a normal 50 mL syringe. When the piston assembly 5 is pushed into the top of the 50 mL sleeve 1, the entire piston assembly 5 can no longer be pushed. The spring 503 arranged at the end of the 50 mL piston 502 is compressed and pushes the gear set and the gear plate 5013 to move into the 50 mL piston 502, and finally drives the 1 mL piston 501 to move inward. Due to the stroke amplification function of the gear set, at this time, when the micro-injection pump pushes the pressing hand 504 to move inward a small stroke, the 1 mL piston 501 can move inward a large stroke. When the pressing hand 504 moves the same distance in the 50 mL sleeve 1 and in the 1 mL sleeve 2, the volume of the discharged liquid is the same.

[0034] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described.

Claims

1. A 50 mL syringe capable of directly and precisely aspirating a small dose of liquid medicine, characterized in that, Comprising: A 50 mL sleeve, a 1 mL sleeve, a conical head, a crimp, and a piston assembly; the 1 mL sleeve is fixedly arranged at the front end of the 50 mL sleeve; the conical head is fixedly arranged at the front end of the 1 mL sleeve; the crimp is fixedly arranged at the end of the 50 mL sleeve; the piston assembly is slidably sleeved inside the 50 mL syringe.

2. The 50 mL syringe capable of directly and precisely aspirating a small dose of liquid medicine according to claim 1, wherein The piston assembly includes: a 1 mL piston, a 50 mL piston, a spring, a push button, a first rack, a second rack, a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, and a gear plate; the 1 mL piston is slidably sleeved inside the 50 mL piston; the end of the 1 mL piston is fixedly connected to the first rack; the second rack is fixedly arranged inside the 50 mL piston; the gear plate is slidably arranged inside the 50 mL piston; the first gear, the second gear, the third gear, the fourth gear, the fifth gear, and the sixth gear are respectively rotatably connected to the gear plate; the end of the gear plate is fixedly connected to the push button; one end of the spring is fixedly connected to the push button, and the other end of the spring is fixedly connected to the end of the 50 mL piston.

3. A 50 mL syringe capable of directly and precisely aspirating a small dose of liquid medicine according to claim 2, characterized in that, The first gear is coaxially and synchronously connected to the second gear; the third gear is coaxially and synchronously connected to the fourth gear; the fifth gear is coaxially and synchronously connected to the sixth gear; the first rack meshes with the first gear; the second gear meshes with the third gear; the fourth gear meshes with the fifth gear, and the sixth gear meshes with the second rack.

4. A 50 mL syringe capable of directly and precisely aspirating a small dose of liquid medicine according to claim 2, characterized in that, The module of the first rack, the second rack, the first gear, the second gear, the third gear, the fourth gear, the fifth gear, and the sixth gear is exactly the same; the number of teeth of the second gear, the fourth gear, and the sixth gear is exactly the same.

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