Syringe and its propulsion system

Abstract

The utility model discloses a push system for a syringe, including a push housing, a piston rod and an injection push rod. The push housing has a working chamber for accommodating the piston rod, the rear end of the piston rod is slidably matched with the wall of the working chamber, the front end of the piston rod is transmission-connected with the injection push rod, and a guide ring is fixedly sleeved on the front end of the piston rod, and the outer periphery of the guide ring is slidably matched with the wall of the working chamber. The guide ring is added to the front end of the piston rod so that the front end is always guided during the forward and backward movement of the piston rod, and the rear end is limitedly guided, so that the smoothness of the movement of the piston rod can be ensured. That is, the piston rod is ensured to run smoothly, the structural vibration is reduced, the friction force on the movement of the injection push rod can be reduced, and the injection speed and injection pressure can be increased, so the problem of poor guiding of the piston rod can be effectively solved. The utility model also discloses a syringe including the above-mentioned push system.

Description

Technical Field

[0001] The utility model relates to the technical field of injection equipment, and more specifically, to a syringe propulsion system and also to a syringe comprising the propulsion system. Background Art

[0002] In the breeding industry, vaccination is very important. The use of needle-free syringes when injecting vaccines can effectively solve the risks of needle breakage, cross-infection among different animals, and mutual transmission of diseases caused by needle injections. Therefore, providing stable and reliable needle-free injection equipment is crucial to the breeding industry.

[0003] The inventor has found through long-term practice that the current double-guide needle-free syringe has no guide at the front end of the piston rod, and is guided by the injection push rod and the front end housing position. The friction during the injection process is large, which affects the injection speed and injection pressure.

[0004] In summary, how to effectively solve the problem of poor guiding performance of the piston rod is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] In view of this, the first object of the present invention is to provide a syringe pushing system, which can effectively solve the problem of poor guiding performance of the piston rod. The second object of the present invention is to provide a syringe including the above-mentioned pushing system.

[0006] In order to achieve the above first purpose, the utility model provides the following technical solutions:

[0007] A push system for a syringe includes a push housing, a piston rod and an injection push rod, the push housing having a working chamber for accommodating the piston rod, the rear end of the piston rod slidingly engaging with the chamber wall of the working chamber, the front end of the piston rod being transmission-connected with the injection push rod, the front end of the piston rod being sleeved and fixed with a guide ring, the outer periphery of the guide ring slidingly engaging with the chamber wall of the working chamber.

[0008] In the push system of the above-mentioned syringe, when in use, when the piston rod moves back and forth in the working chamber to drive the injection push rod to move back and forth, the rear end of the piston rod is guided, and the front end is guided by the guide ring to ensure that the forward and backward movement of the piston rod is smooth, thereby avoiding the deviation of the piston rod. In the above-mentioned push system, a guide ring is added to the front end of the piston rod so that the front end is always guided during the forward and backward movement of the piston rod, and the rear end is limited and guided, which can ensure the smoothness of the movement of the piston rod. That is, the piston rod is guaranteed to run smoothly, the structural vibration is reduced, the friction force on the movement of the injection push rod can be reduced, and the injection speed and injection pressure can be increased. In summary, the push system of the syringe can effectively solve the problem of poor guiding of the piston rod.

[0009] In some technical solutions, a power spring is further included, which is sleeved on the piston rod, the first end of the power spring abuts against the piston rod, and the second end of the power spring abuts against the inner protrusion inside the working chamber.

[0010] In some technical solutions, a fixing seat is provided at the front end of the piston rod, and two sides of the guide ring are respectively abutted against the fixing seat and one end of the power spring.

[0011] In some technical solutions, the rear end of the working chamber is threadedly connected to a guide seat, and the piston rod is slidably matched with the inner hole of the guide seat.

[0012] In some technical solutions, the inner protrusion is threadedly connected to the inner wall of the rear end of the working chamber, and the guide seat is threadedly connected to the inner hole of the inner protrusion.

[0013] In some technical solutions, it includes two piston rods arranged in parallel, the pushing shell has the working chambers respectively matched with the two piston rods, the two ends of the fixing seat are respectively connected to the two piston rods, and the middle part of the fixing seat is connected to the injection push rod.

[0014] In some technical solutions, the middle part of the fixed seat has a waisted structure, the front ends of the two working cavities are connected to form a through groove that cooperates with the waisted structure, and the central angle of the opening at the end of the through groove corresponding to the front end side of the working cavity is no more than 180 degrees.

[0015] In some technical solutions, a connecting seat is further included at the rear end of the pushing shell, and the rear ends of the two piston rods extend to the outside of the working chamber and are connected to the connecting seat.

[0016] In some technical solutions, the fixing seat is connected to the end of the piston rod via a first axial screw, and the connecting seat is connected to the end of the piston rod via a second axial screw.

[0017] In order to achieve the second purpose, the utility model also provides a syringe, which includes any of the above-mentioned propulsion systems, including a front end housing, the propulsion housing of the propulsion system and the front end housing are fixedly connected; the injection push rod of the propulsion system is slidably matched with the front end housing to push the liquid medicine in the front end housing. Since the above-mentioned propulsion system has the above-mentioned technical effects, the syringe having the propulsion system should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic cross-sectional structure diagram of a syringe provided in an embodiment of the utility model.

[0020] The following are marked in the accompanying drawings:

[0021] Push housing 1, front housing 2, injection push rod 3, fixing seat 4, guide ring 5, power spring 6, piston rod 7, guide seat 8. DETAILED DESCRIPTION

[0022] The embodiment of the utility model discloses a pushing system of a syringe, which can effectively solve the problem of poor guiding performance of a piston rod.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , Figure 1 This is a schematic cross-sectional structure diagram of a syringe provided in an embodiment of the utility model.

[0025] In some embodiments, a syringe pushing system is provided, which is used to push the liquid medicine in the syringe to complete the injection. Specifically, the syringe is mainly a needle-free syringe, and of course it can also be applied to other syringes in some cases.

[0026] Specifically, the push system of the syringe mainly includes a push housing 1, a piston rod 7, an injection push rod 3, a guide ring 5, etc. Of course, some other structures may also be included, such as a power spring 6 mentioned later.

[0027] The push housing 1 has a working chamber for accommodating the piston rod 7, so that a power device, such as a power spring 6, etc., can be set to drive the piston rod 7 to move axially. The front end of the piston rod 7 is connected to the injection push rod 3 in a transmission manner to drive the injection push rod 3 to move forward and backward. Generally speaking, the piston rod 7 can be directly or indirectly fixedly connected to the injection push rod 3, thereby driving the injection push rod 3 to move forward and backward. Generally, the injection push rod 3 moves forward to form an injection, and the injection push rod 3 moves backward to complete the extraction.

[0028] The rear end of the piston rod 7 is slidably matched with the wall of the working chamber to constrain the moving direction of the rear end of the piston rod 7, mainly for guidance to prevent vibration of the rear end of the piston rod 7. The sliding match can be directly achieved through high-precision shaft hole matching, or it can be further achieved with the help of a linear bearing.

[0029] The front end of the piston rod 7 is sleeved with a guide ring 5, wherein the outer periphery of the guide ring 5 is slidably matched with the cavity wall of the working cavity. The outer periphery of the guide ring 5 and the cavity wall of the working cavity are matched with each other with high precision, thereby achieving sliding fit. The guide ring 5 is fixed to the front end of the piston rod 7, so that the piston rod 7 is always limited in position during the sliding process due to the existence of the guide ring 5 to avoid lateral shaking.

[0030] In the push system of the above-mentioned syringe, when in use, when the piston rod 7 moves back and forth in the working chamber to drive the injection push rod 3 to move back and forth, the rear end of the piston rod 7 is guided, and the front end is guided by the guide ring 5 to ensure that the forward and backward movement of the piston rod 7 is smooth, thereby avoiding the deviation of the piston rod 7. In the above-mentioned push system, the guide ring 5 is added to the front end of the piston rod 7, so that the front end is always guided during the forward and backward movement of the piston rod 7, and the rear end is limited and guided, which can ensure the smoothness of the movement of the piston rod 7. That is, the piston rod 7 is guaranteed to run smoothly, the structural vibration is reduced, the friction force on the movement of the injection push rod 3 can be reduced, and the injection speed and injection pressure can be increased. In summary, the push system of the syringe can effectively solve the problem of poor guiding of the piston rod 7.

[0031] In some embodiments, as described above, a power spring 6 may be further included, and the power spring 6 may be used to prevent the piston rod 7 from moving backward to push the piston rod 7 forward; or it may be used to prevent the piston rod 7 from moving forward to push the piston rod 7 backward. Specifically, the power spring 6 may be sleeved on the piston rod 7, and the first end of the power spring 6 may abut against the piston rod 7, such as being fixedly connected or only abutting against it front and back, and the second end of the power spring 6 may abut against the inner protrusion inside the working chamber, such as being fixedly connected or only abutting against it front and back.

[0032] In some embodiments, the front end of the piston rod 7 may be provided with a fixing seat 4, and the two sides of the guide ring 5 are respectively in contact with the fixing seat 4 and one end of the power spring 6. In this case, the first end of the power spring 6 is the rear end of the power spring 6. In this case, when the piston rod 7 moves backward, the power spring 6 is elastically compressed and deformed, and when the external force driving the piston rod 7 to move backward is removed, the piston rod 7 is driven to move forward under the elastic force of the power spring 6.

[0033] In some embodiments, in order to facilitate the guidance of the rear end of the piston rod 7, a guide seat 8 can be provided separately, and the guide seat 8 can be provided separately for convenient processing. Specifically, the rear end of the working chamber can be threadedly connected with the guide seat 8, and the piston rod 7 is slidably matched with the inner hole of the guide seat 8. Specifically, the radial outer side of the guide seat 8 can be provided with a thread with an axial direction in the front-to-back direction for threaded connection.

[0034] In some embodiments, in order to facilitate the installation of the above-mentioned power spring 6, the inner protrusion therein can be threadedly connected to the inner wall of the rear end of the working chamber, so that the power spring 6 can be installed into the working chamber from the rear side of the working chamber, and the corresponding above-mentioned fixed seat 4, guide ring 5 and piston rod 7 can all be installed into the working chamber from the rear side of the working chamber, and then after the power spring 6 is installed, the above-mentioned inner protrusion is installed.

[0035] In some embodiments, the guide seat 8 can be threadedly connected to the inner hole of the inner protrusion, that is, the inner protrusion can be tubular, the outer thread cooperates with the inner thread of the working chamber to be threadedly connected, and the front end forms an abutting end face to abut the power spring 6. The rear end of the inner protrusion is provided with a threaded hole to match the outer thread of the guide seat 8. In order to ensure that the abutting end face area meets the requirements, the front end of the inner protrusion forms a radial protrusion radially inward to expand the abutting end face, and the guide seat 8 is located at the rear side of the radial protrusion.

[0036] In some embodiments, in order to better drive the injection push rod 3 and transmit a larger force, the number of piston rods 7 can be increased. For example, the pushing system can include two piston rods 7 arranged in parallel. Specifically, the pushing housing 1 can have working chambers respectively matched with the two piston rods 7. For example, when a power spring 6 is provided, two power springs 6 are correspondingly provided.

[0037] The two ends of the fixing seat 4 can be connected to the two piston rods 7 respectively, and the middle part of the fixing seat 4 can be connected to the injection push rod 3, so that the two piston rods 7 can apply thrust to the injection push rod 3 at the same time through the fixing seat 4.

[0038] In some embodiments, for the convenience of setting, the main structure of the fixing seat 4 can be set outside the working cavity, and two axially extending protrusions can be set to extend into each working cavity respectively to abut against the corresponding guide ring 5 to transmit force. However, this structural setting is inconvenient. Specifically, the middle part of the fixing seat 4 can have a waist structure, such as an 8-shaped structure, and the two ends of the waist structure are connected to the cylindrical part to be respectively installed in the two working cavities.

[0039] The front ends of the two working chambers are horizontally intersected to form a through groove that matches the waist structure, so as to accommodate the waist structure, so that the cylindrical parts at both ends of the fixing seat 4 can move in the working chambers at both ends and connect the corresponding piston rod 7 and the guide ring 5. The central angle of the opening corresponding to the end of the through groove at the front side of the working chamber is not greater than 180 degrees, so as to avoid the front end of the working chamber having a poor guiding effect on the guide ring 5 due to the opening of the corresponding through groove. Specifically, the central angle of the opening corresponding to the front side of the working chamber can be about 60 degrees.

[0040] In some embodiments, in order to facilitate the application of tension and / or thrust to the two piston rods 7, a connection seat is preferably provided at the rear end of the push housing 1, and the rear ends of the two piston rods 7 extend to the outside of the working chamber and are connected to the connection seat. In the later stage, the piston rods 7 can be simultaneously applied with tension and / or thrust through the connection seat.

[0041] In some embodiments, for convenient connection, the fixing seat 4 can be connected to the end of the piston rod 7 by a first axial screw, and the connecting seat can be connected to the end of the piston rod 7 by a second axial screw. The first axial screw and the second axial screw are respectively threadedly matched with the internal threaded holes at both ends of the piston rod 7.

[0042] In some embodiments, a needle-free injector is provided, such as Figure 1 As shown, the technical solution mainly includes a push shell 1, a front end shell 2, an injection push rod 3, a fixing seat 4, a guide ring 5, a power spring 6, a piston rod 7, and a guide seat 8.

[0043] Specifically, the working process is as follows: the push housing 1 is fixedly connected to the front housing 2, and inside the push housing 1, two power springs 6 and two piston rods 7 are fixed on the fixing seat 4, and a guide ring 5 is installed between the power spring 6 and the fixing seat 4. A guide seat 8 is installed at the rear end of the push housing 1 to cooperate with the piston rod 7.

[0044] The injection push rod 3 is connected to the fixing seat 4, and the injection push rod 3 cooperates with the front end housing 2. When the piston rod 7 moves, it drives the fixing seat 4 and the injection push rod 3 to move, and the injection is completed.

[0045] In the above-mentioned needle-free syringe, by installing a guide ring 5 between the fixed seat 4 and the power spring 6, the piston rod 7 is ensured to run smoothly and the structural vibration is reduced. At the same time, the coaxiality of the injection push rod 3 and the front end shell 2 is ensured, the friction between the injection push rod 3 and the front end shell 2 is reduced, and the injection speed and injection pressure are increased.

[0046] Based on the push system provided in the above embodiments, the utility model also provides a syringe, which includes any one of the push systems in the above embodiments, and also includes a front end housing, the push housing of the push system and the front end housing are fixedly connected; the injection push rod of the push system is slidably matched with the front end housing to push the medicinal liquid in the front end housing. Since the syringe adopts the push system in the above embodiments, please refer to the above embodiments for the beneficial effects of the syringe.

[0047] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A syringe propulsion system, characterized in that: It includes a push shell, a piston rod and an injection push rod. The push shell has a working chamber for accommodating the piston rod. The rear end of the piston rod is slidably matched with the wall of the working chamber. The front end of the piston rod is transmission-connected with the injection push rod. A guide ring is fixedly mounted on the front end of the piston rod. The outer periphery of the guide ring is slidably matched with the wall of the working chamber.

2. The syringe propulsion system according to claim 1, characterized in that: It also includes a power spring, which is sleeved on the piston rod, with a first end of the power spring abutting against the piston rod, and a second end of the power spring abutting against an inner protrusion inside the working chamber.

3. The syringe pushing system according to claim 2, characterized in that: A fixing seat is arranged at the front end of the piston rod, and two sides of the guide ring are respectively in contact with the fixing seat and one end of the power spring.

4. The syringe pushing system according to claim 3, characterized in that: The rear end of the working chamber is threadedly connected with a guide seat, and the piston rod is slidably matched with the inner hole of the guide seat.

5. The syringe pushing system according to claim 4, characterized in that: The inner protrusion is threadedly connected to the inner wall of the rear end of the working chamber, and the guide seat is threadedly connected to the inner hole of the inner protrusion.

6. The syringe pushing system according to claim 5, characterized in that: It comprises two piston rods arranged in parallel, the pushing shell has the working chambers respectively matched with the two piston rods, the two ends of the fixing seat are respectively connected with the two piston rods, and the middle part of the fixing seat is connected with the injection push rod.

7. The syringe pushing system according to claim 6, characterized in that: The middle part of the fixing seat has a waist structure, the front ends of the two working cavities are connected to form a through groove matching the waist structure, and the central angle corresponding to the opening of the through groove end at the front end side of the working cavity is no more than 180 degrees.

8. The syringe pushing system according to claim 7, characterized in that: It also includes a connecting seat arranged at the rear end of the pushing shell, and the rear ends of the two piston rods both extend to the outside of the working chamber and are both connected to the connecting seat.

9. The syringe pushing system according to claim 8, characterized in that: The fixing seat is connected to the end of the piston rod via a first axial screw, and the connecting seat is connected to the end of the piston rod via a second axial screw.

10. A syringe comprising a front end housing, characterized in that: It comprises a propulsion system as described in any one of claims 1 to 9, wherein the propulsion shell of the propulsion system is fixedly connected to the front end shell; the injection push rod of the propulsion system is slidably matched with the front end shell to push the medicinal liquid in the front end shell.

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