Precision dosing pump injector

Abstract

The utility model discloses a precise dosing pump injector which comprises a cylinder body, a core rod which is arranged in the cylinder body and used for extruding liquid medicine and a sealing assembly which is arranged in the cylinder body and used for playing a sealing role. The front end of the core rod is provided with a hard surface part which is matched with the sealing assembly and used for extruding liquid medicine. The rubber plug has the advantages that contact between an original rubber plug and liquid medicine is removed, the front end of the core rod is designed to be the hard surface consistent with the inclined face of the original rubber plug, in the using process, the rubber plug cannot be deformed due to extrusion of the liquid medicine, and the O-shaped sealing ring can also play a good sealing role.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a syringe for a pump with precise drug delivery. Background Art

[0002] (See Figure 1 ) At present, the main accessories of the syringe for a pump produced by the company are a barrel body 1, a rubber stopper 2, and a plunger rod 3. In the existing syringe for a pump, the plunger rod 3 of the syringe for a pump is usually designed to be assembled and used with the rubber stopper 2. When the device pushes the plunger rod 3, the injection liquid medicine in the cavity of the barrel body 1 generates a certain pressure on the rubber stopper 2 due to extrusion, causing the rubber stopper 2 to deform. The deformation of the rubber stopper 2 will cause a certain error in the injection volume when injecting the liquid medicine.

[0003] Therefore, through beneficial exploration and research, the applicant has found a method to solve the above problems, and the technical solution to be introduced below is generated under this background. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a syringe for a pump with precise drug delivery to solve the above problems in view of the above deficiencies and defects of the prior art.

[0005] The technical problem to be solved by the utility model can be realized by adopting the following technical solutions:

[0006] A syringe for a pump with precise drug delivery, characterized in that it includes a barrel body, a plunger rod movably arranged in the barrel body and used for extruding liquid medicine, and a sealing assembly arranged inside the barrel body and used for sealing. The front end of the plunger rod is provided with a hard surface part that cooperates with the sealing assembly and is used for extruding liquid medicine.

[0007] In a preferred embodiment of the utility model, the top of the barrel body is an injection end, the tail of the barrel body is an extended structure, and the tail of the barrel body is provided with a cross-shaped cover for fixing the plunger rod. The cross-shaped cover is detachably connected to the tail of the barrel body.

[0008] In a preferred embodiment of the utility model, a handle convenient for nurses to operate is arranged on the side of the barrel body.

[0009] In a preferred embodiment of the utility model, the sealing assembly is an O-ring sleeved on the front end of the plunger rod.

[0010] Due to adopting the above technical solutions, the beneficial effects of the utility model are as follows: By using the utility model, the contact between the original rubber stopper and the liquid medicine is removed. The front end of the plunger rod is designed into a hard surface consistent with the inclined surface of the original rubber stopper. In this way, during the use process, the extrusion of the liquid medicine will not cause the rubber stopper to deform, and the O-ring can also play a good sealing role. Brief Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0012] Figure 1 is a schematic structural diagram of the prior art.

[0013] Figure 2 is a schematic structural diagram of the present invention.

[0014] Figure 3 is a schematic structural diagram of the barrel body of the present invention.

[0015] Figure 4 is a schematic structural diagram of the cross-shaped cover of the present invention. Detailed Description of the Embodiments

[0016] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0017] See Figures 2 to 4 A syringe for a precision drug delivery pump shown in the figure, which includes a barrel body 10, a plunger rod 20 disposed in the barrel body 10 and used to extrude the liquid medicine, and a sealing assembly 30 disposed inside the barrel body 10 and used to play a sealing role. A hard surface portion 20a that cooperates with the sealing assembly 30 and is used to extrude the liquid medicine is provided at the front end of the plunger rod 20. The sealing assembly 30 in this embodiment is preferably an O-ring sleeved on the front end of the plunger rod 20.

[0018] The top of the barrel body 10 is an injection end 11, the tail of the barrel body 10 is an extended structure 12, a cross-shaped cover 10a for fixing the plunger rod 20 is provided at the tail of the barrel body 10, and the cross-shaped cover 10a is detachably connected to the tail of the barrel body 10. A handle 13 for facilitating the operation of the nurse is provided on the side of the barrel body 10 in this embodiment. The present invention has made an extended design for the tail structure of the barrel body 10, and a cross-shaped cover 10a is installed at the tail 10. The function of the cross-shaped cover 10a is to prevent the problem of the plunger rod 20 swinging when the liquid medicine is drawn to the full amount.

[0019] The working principle of the present invention is as follows:

[0020] When the liquid medicine is injected into the barrel body 10 and then extruded by the core rod 20, since the hard surface portion 20a at the front end of the core rod 20 contacts the liquid medicine, it is possible to prevent the sealing assembly 30 from being extruded and deformed. Since the O-ring 30 is sleeved on the front end of the core rod 20, it can also play a good sealing role. When the liquid medicine is drawn to the full amount, the presence of the cross cover 10 can prevent the core rod 20 from swinging.

[0021] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A syringe for a pump for precise drug delivery, characterized in that, It includes a barrel body, a core rod disposed within the barrel body for extruding liquid medicine, and a sealing assembly disposed inside the barrel body for sealing purposes. A hard surface portion for squeezing the liquid medicine is provided at the front end of the core rod and is configured to cooperate with the sealing assembly.

2. The syringe for a pump for precise drug delivery according to claim 1, wherein The top of the barrel body is the injection end, and the tail of the barrel body is an extended structure. A cross cap for fixing the core rod is provided at the tail of the barrel body, and the cross cap is detachably connected to the tail of the barrel body.

3. The syringe for a pump for precise drug delivery according to claim 1, characterized in that, A handle for facilitating the operation of nurses is provided on the side of the barrel body.

4. The syringe for a pump for precise drug delivery according to claim 1, characterized in that, The sealing assembly is an O-ring sleeved on the front end of the core rod.

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