Injector and injection structure thereof

Abstract

The injection structure comprises an injection shell and an injection push rod, the injection push rod comprises an injection rod part and a driving rod part which are sequentially arranged in the injection direction, the injection rod part is in sliding fit with a medicine cavity of the injection shell in the front-back direction, and the driving rod part extends into the medicine cavity; the injection rod part and the driving rod part are connected through a flexible structure so as to transfer force in the front-back direction, and the injection rod part and the driving rod part have a relative movement range with a preset size in the direction perpendicular to the front-back direction. Due to flexible structure connection, only the injection rod part and the medicine cavity need to achieve high-precision coaxiality, the driving rod part and the medicine cavity do not need to achieve high-precision coaxiality, the coaxiality requirement is lowered, and meanwhile injection driving can be met. The overall design and manufacturing are simple and convenient, and meanwhile the friction problem caused by different shafts can be avoided. The utility model further discloses an injector comprising the injection structure.

Description

Technical Field

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

[0002] Needle-free injection equipment is crucial in the breeding industry, as it can solve the risks of needle breakage, cross-infection between different animals, and disease transmission between each other caused by needle injection. Needle-free injection equipment needs to complete the injection in a very short time. The friction between the injection push rod and the injection housing will affect the injection speed and reduce the injection pressure. It is necessary to ensure the coaxiality of the injection push rod and the medicine cavity, but currently this is achieved by improving the processing accuracy and assembly accuracy, which will greatly increase the cost.

[0003] In summary, how to effectively solve the problem of relatively high matching accuracy requirements between the injection push rod and the injection housing is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] In view of this, the first object of the utility model is to provide an injection structure of a syringe, which can effectively solve the problem of high matching accuracy requirements between the injection push rod and the injection housing. The second object of the utility model is to provide a syringe including the above-mentioned injection structure.

[0005] In order to achieve the above first purpose, the utility model provides the following technical solutions:

[0006] An injection structure of a syringe comprises an injection shell and an injection push rod, wherein the injection push rod comprises an injection rod portion and a drive rod portion which are sequentially arranged along an injection direction, the injection rod portion slidingly cooperates with a medicine cavity of the injection shell along a front-to-back direction, and the drive rod portion extends into the medicine cavity; the injection rod portion and the drive rod portion are connected by a flexible structure to transmit force in the front-to-back direction, and have a relative range of motion of a predetermined size in a direction perpendicular to the front-to-back direction.

[0007] In the injection structure of the above-mentioned syringe, when in use, the driving rod is connected to the pushing device, and the pushing device drives the driving rod to move in the front-to-back direction. Through the flexible structure, the force in the front-to-back direction can be transmitted to the injection rod, thereby driving the injection rod to complete the injection. In the above-mentioned injection structure, because of the flexible structure connection, it is only necessary to make the injection rod and the medicine cavity achieve high-precision coaxiality, without the need to make the driving rod and the medicine cavity achieve high-precision coaxiality, thereby reducing the coaxiality requirements and meeting the injection drive. The overall design is simple and convenient to manufacture, and can avoid the friction problem caused by different axes. In summary, the injection structure of the syringe can effectively solve the problem of high matching accuracy requirements between the injection push rod and the injection shell.

[0008] In some technical solutions, the flexible structure includes a latching protrusion and a latching groove that limits the forward and backward movement of the latching protrusion, and a gap is formed between the neck of the latching protrusion and the avoidance opening of the groove wall on one side of the latching groove so that relative movement in a vertical direction in the forward and backward direction is possible; one of the latching protrusion and the latching groove is arranged on the injection rod part, and the other is arranged on the driving rod part.

[0009] In some technical schemes, the front end of the driving rod has a slot extending in the first direction in the slot depth direction, and the front side slot wall of the slot is provided with the avoidance opening extending in the first direction in the middle part; the protrusion of the locking protrusion is inserted into the slot along the first direction, and the neck is located in the avoidance opening and has a movable gap in the first direction; in the second direction, both sides of the neck and the avoidance opening have movable gaps; the first direction and the second direction are arranged perpendicular to each other.

[0010] In some technical solutions, the flexible structure is a colloidal structure.

[0011] In some technical solutions, two ends of the colloid structure are bonded or clamped to the injection rod portion and the driving rod portion.

[0012] In some technical solutions, a first sealing ring is sleeved on the injection rod portion to seal with the wall of the medicine chamber.

[0013] In some technical solutions, the injection rod has column parts on both sides of the first sealing ring to abut against the cavity wall of the medicine cavity.

[0014] In some technical solutions, the inner end of the injection shell has a sealing end cover, the driving rod is passed through the center hole of the sealing end cover, and a second sealing ring is arranged in the center hole of the sealing end cover.

[0015] In some technical solutions, a gap is set between the driving rod and the wall of the medicine chamber.

[0016] In order to achieve the second objective, the utility model also provides a syringe, which comprises any one of the above injection structures, and also comprises a pushing device, wherein the injection push rod of the injection structure is connected to the pushing end of the pushing device. Since the above injection structure has the above technical effects, the syringe having the injection structure should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of a syringe provided in an embodiment of the utility model.

[0019] The following are marked in the accompanying drawings:

[0020] Injection housing 1, injection rod 2, driving rod 3, first sealing ring 4, pushing device 5, clamping protrusion 6, clamping groove 7, second sealing ring 8. DETAILED DESCRIPTION

[0021] The embodiment of the utility model discloses an injection structure of a syringe, which effectively solves the problem of relatively high matching accuracy requirement between an injection push rod and an injection housing.

[0022] 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.

[0023] See also Figure 1 , Figure 1 A schematic diagram of the structure of a syringe provided in an embodiment of the utility model.

[0024] In some embodiments, this embodiment provides an injection structure of a syringe. Specifically, the injection structure includes an injection housing 1 and an injection push rod.

[0025] A medicine cavity is formed in the injection shell 1, and the injection push rod slides with the medicine cavity along the front-to-back direction (injection direction) so that when moving forward, the medicine liquid in the medicine cavity is pushed out from the front end, and when moving backward, it can be used to suck the medicine liquid into the medicine cavity.

[0026] The injection push rod includes an injection rod 2 and a driving rod 3 which are sequentially arranged along the injection direction, wherein the injection rod 2 is slidably matched with the medicine cavity of the injection housing 1 in the front-to-back direction, so as to be mainly used to drive the medicine therein to be pushed out from the injection housing 1, that is, the front end of the injection rod 2 is the injection cavity. The driving rod 3 also extends into the medicine cavity for transmitting force with the injection rod 2, and the rear end of the driving rod 3 extends out of the injection housing 1 to be connected with the pushing device 5, that is, the driving rod 3 transmits force between the injection rod 2 and the pushing device 5. It should be noted that the length of the injection rod 2 in the front-to-back direction is preferably less than the length of the driving rod 3 in the front-to-back direction. In order to meet the requirement of stable movement of the injection rod 2, generally speaking, the length of the injection rod 2 in the front-to-back direction is preferably between two and three times the diameter of the medicine cavity.

[0027] Moreover, the injection rod 2 and the driving rod 3 are connected by a flexible structure to transmit force in the front-to-back direction, and have a predetermined relative range of motion in the direction perpendicular to the front-to-back direction, so that the driving rod 3 can drive the injection rod 2 to move in the front-to-back direction to complete injection and liquid extraction, and in the transverse direction, that is, the radial direction, the injection rod 2 and the driving rod 3 can adjust their positions relatively to avoid interference with each other. So that when the injection rod 2 and the driving rod 3 are not coaxial, they can move freely relative to each other.

[0028] The relative range of motion of the predetermined size is generally set corresponding to the axis deviation range between the injection rod 2 and the drive rod 3 to fully meet the deviation requirements, so that the vertical force in the front-to-back direction will not be transmitted between the drive rod 3 and the injection rod 2, thereby reducing the impact of the axis error.

[0029] In the injection structure of the above-mentioned syringe, when in use, the driving rod 3 is connected to the pushing device 5, and the pushing device 5 drives the driving rod 3 to move in the front-to-back direction. Through the flexible structure, the force in the front-to-back direction can be transmitted to the injection rod 2, thereby driving the injection rod 2 to complete the injection. In the above-mentioned injection structure, because of the flexible structure connection, it is only necessary to make the injection rod 2 and the medicine cavity achieve high-precision coaxiality, without the need to make the driving rod 3 and the medicine cavity achieve high-precision coaxiality, thereby reducing the coaxiality requirements and meeting the injection drive. The overall design is simple and convenient to manufacture, and can avoid the friction problem caused by different axes. In summary, the injection structure of the syringe can effectively solve the problem of high matching accuracy requirements between the injection push rod and the injection housing 1.

[0030] In some embodiments, the flexible structure can achieve the above flexibility requirements through a mechanical structure, or can be achieved through a material body formed by a flexible material, such as a colloid, a cloth structure, a rope structure, etc. The mechanical structure is a chain structure, a buckle structure, etc.

[0031] In some embodiments, the flexible structure includes a protrusion 6 and a slot 7 for limiting the forward and backward movement of the protrusion 6, wherein one of the protrusion 6 and the slot 7 is provided on the injection rod 2, and the other is provided on the driving rod 3. For example, the slot 7 is provided on the injection rod 2, which can be integrally formed, welded, screwed, etc.; and the driving rod 3 is correspondingly provided with a protrusion 6, which can be integrally formed, welded, screwed, etc.

[0032] A gap is formed between the neck of the clamping protrusion 6 and the avoidance opening of the groove wall on one side of the clamping groove 7, so that relative movement in the vertical direction of the front-to-back direction is possible, and the relative movement range satisfies the relative activity range of the predetermined size mentioned above. In this way, within the activity range of the predetermined size in the vertical direction of the front-to-back direction, no force is transmitted to avoid interference. The clamping protrusion 6 also has the above-mentioned activity range in the clamping groove 7. It should be noted that the relative movement in the vertical direction of the front-to-back direction can be relative movement in any vertical direction of the front-to-back direction, or relative movement in a few vertical directions of the front-to-back direction.

[0033] In some embodiments, specifically, the front end of the driving rod portion 3 can have a slot 7 extending in the first direction in the slot depth direction, and a front side slot wall of the slot 7 has a avoidance opening extending in the first direction in the middle of the second direction, wherein the second direction, the first direction and the front-to-back direction are all arranged perpendicular to each other.

[0034] The protrusion of the clamping protrusion 6 is inserted into the clamping slot 7 along the first direction, and has a certain movable gap in the first direction and the second direction to form a flexible movable range, and can move relatively in any vertical direction of the front and rear directions.

[0035] The neck of the clamping protrusion 6 is located in the avoidance opening and has a movable gap in the first direction, and in the second direction, both sides of the neck and the avoidance opening have movable gaps, so that any vertical direction in the front-to-back direction can move relative to each other.

[0036] In some embodiments, the flexible structure may be a colloid structure. Specifically, the two ends of the colloid structure are bonded or clamped to the injection rod 2 and the drive rod 3. If clamping is adopted, a tight clamping may be adopted, and the lateral relative movement between the injection rod 2 and the drive rod 3 is achieved by deformation of the colloid structure.

[0037] In some embodiments, in order to ensure that the injection cavity is better compressed, it is generally necessary to sleeve a first sealing ring 4 on the injection rod 2 to seal with the wall of the medicine cavity. At this time, the first sealing ring 4 is in a compressed state.

[0038] In some embodiments, in order to better guide the forward and backward movement of the injection rod 2 by the medicine cavity, it is preferred that the injection rod 2 has columns on both sides of the first sealing ring 4 to abut against the cavity wall of the medicine cavity.

[0039] In some embodiments, generally speaking, in order to better seal the medicine cavity, the inner end of the injection shell 1 can be provided with a sealing end cover, and the driving rod portion 3 therein passes through the middle hole of the sealing end cover, and a second sealing ring 8 is provided in the middle hole of the sealing end cover to form a sealing contact between the sealing end cover and the driving rod portion 3.

[0040] In some embodiments, a gap can be set between the driving rod 3 and the wall of the medicine chamber to facilitate the movement of the driving rod 3 in the medicine chamber. It should be noted that the gap between the driving rod 3 and the wall of the medicine chamber can be set by the second sealing ring 8 or fixedly installed on the pushing end of the pushing device 5.

[0041] In some embodiments, the present embodiment provides a needle-free syringe, comprising an injection housing 1 , an injection rod 2 , a drive rod 3 and a first sealing ring 4 .

[0042] The injection rod 2 and the drive rod 3 are flexibly connected and installed in the medicine cavity of the injection housing 1. A first sealing ring 4 is installed on the injection rod 2, which has an interference fit with the inner wall of the medicine cavity. The outer diameter of the drive rod 3 is smaller than the inner hole of the medicine cavity and there is no fitting relationship.

[0043] The injection rod 2 and the medicine cavity can maintain a coaxial relationship and are not affected by the power part of the equipment, thereby reducing the friction between the injection rod 2 and the medicine cavity.

[0044] In the above-mentioned needle-free syringe, the coaxiality of the injection push rod and the medicine cavity is ensured by a split injection push rod structure. During the injection process, the friction caused by the different axes is reduced, the injection speed and injection pressure are increased, and the wear of parts is reduced.

[0045] Based on the injection structure of the syringe provided in the above embodiments, the utility model further provides a syringe, which includes any one of the injection structures in the above embodiments, and further includes a pushing device 5, wherein the injection push rod of the injection structure is connected to the pushing end of the pushing device 5. Since the syringe adopts the injection structure in the above embodiments, please refer to the above embodiments for the beneficial effects of the syringe.

[0046] 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.

[0047] 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. An injection structure of a syringe, comprising an injection housing and an injection push rod, characterized in that: The injection push rod includes an injection rod portion and a driving rod portion which are sequentially arranged along the injection direction. The injection rod portion is slidably matched with the medicine cavity of the injection shell along the front-to-back direction, and the driving rod portion extends into the medicine cavity. The injection rod portion and the driving rod portion are connected by a flexible structure to transmit force in the front-to-back direction, and have a relative range of motion of a predetermined size in a direction perpendicular to the front-to-back direction.

2. The injection structure of the syringe according to claim 1, characterized in that: The flexible structure includes a clamping protrusion and a clamping groove that limits the forward and backward movement of the clamping protrusion. A gap is formed between the neck of the clamping protrusion and the avoidance opening of the groove wall on one side of the clamping groove so that relative movement in the vertical direction of the forward and backward direction is possible; one of the clamping protrusion and the clamping groove is arranged on the injection rod part, and the other is arranged on the driving rod part.

3. The injection structure of the syringe according to claim 2, characterized in that: The front end of the driving rod portion has a slot extending in the first direction in the slot depth direction, and the front side slot wall of the slot is provided with the avoidance opening extending in the first direction in the middle part; the protrusion of the locking protrusion is inserted into the slot along the first direction, and the neck is located in the avoidance opening and has a movable gap in the first direction; in the second direction, both sides of the neck have movable gaps with the avoidance opening; the first direction and the second direction are arranged perpendicular to each other.

4. The injection structure of the syringe according to claim 1, characterized in that: The flexible structure is a colloidal structure.

5. The injection structure of the syringe according to claim 4, characterized in that: The two ends of the colloid structure are bonded or clamped to the injection rod part and the driving rod part.

6. The injection structure of the syringe according to any one of claims 1 to 4, characterized in that: The injection rod is sleeved with a first sealing ring to seal with the wall of the medicine cavity.

7. The injection structure of the syringe according to claim 6, characterized in that: The injection rod has column parts on both sides of the first sealing ring to abut against the cavity wall of the medicine cavity.

8. The injection structure of the syringe according to claim 7, characterized in that: The inner end of the injection housing is provided with a sealing end cover, the driving rod is passed through the center hole of the sealing end cover, and a second sealing ring is provided in the center hole of the sealing end cover.

9. The injection structure of the syringe according to claim 6, characterized in that: A gap is provided between the driving rod and the wall of the medicine chamber.

10. A syringe comprising a pushing device, characterized in that: It also includes the injection structure according to any one of claims 1 to 9, wherein the injection push rod of the injection structure is connected to the pushing end of the pushing device.

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