Liquid pushing mechanism and injector

Abstract

The utility model relates to the technical field of needleless injectors, in particular to a liquid pushing mechanism and an injector, the liquid pushing mechanism comprises a liquid storage assembly, the liquid storage assembly comprises a liquid storage tube and a liquid outlet hole arranged at the end part of the liquid storage tube; the pushing assembly comprises a piston rod arranged in the liquid storage pipe in a sliding mode and a push rod capable of moving relative to the piston rod; the push rod can drive the piston rod to move synchronously when the relative displacement reaches the tail end of the stroke. According to the liquid pushing mechanism and the injector, a relative displacement action exists between the piston rod and the push rod, when the push rod and the piston rod generate relative displacement, the moving speed of the push rod can be increased, when the push rod makes contact with the piston rod, the piston rod can be impacted, and when the piston rod is impacted, the liquid medicine spraying pressure can be increased, so that the epidermis can be punctured conveniently; the piston rod moves along with the push rod in the later period to slowly enter the human body.

Description

Technical Field

[0001] This utility model relates to the technical field of needleless injectors, and more particularly to a liquid dispensing mechanism and injector. Background Technology

[0002] Needle-free injectors mainly utilize the principle of pressure jet. The internal pressure device generates pressure, which pushes the liquid in the tube through micropores to form an extremely fine liquid column. This allows the liquid to penetrate the epidermis and reach the subcutaneous layer instantly. The liquid is then absorbed in a diffused manner with a diameter of 3-5 cm under the skin.

[0003] Needle-free injectors include a drug reservoir. The drug reservoir pushes out the internal liquid through the movement of a piston to complete the injection. Currently, the piston movement is dynamic, and the pressure of the liquid sprayed from the drug reservoir is constant, which is not conducive to injection after penetrating the human epidermis. Utility Model Content

[0004] In view of the problems existing in the above-mentioned liquid pushing mechanism and syringe, this utility model is proposed.

[0005] Therefore, one of the objectives of this invention is to provide a liquid-pushing mechanism, the purpose of which is to change the state of piston movement.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a liquid pushing mechanism, comprising,

[0007] A liquid storage assembly, the liquid storage assembly including a liquid storage tube and a liquid outlet disposed at the end of the liquid storage tube; and,

[0008] A pushing assembly, the pushing assembly including a piston rod slidably disposed in the liquid storage tube, and a push rod capable of relative displacement with respect to the piston rod;

[0009] When the push rod reaches the end of its stroke in relative displacement, it will drive the piston rod to move synchronously.

[0010] In a preferred embodiment of the liquid pushing mechanism of this utility model, one end of the piston rod is sealed to the inside of the liquid storage tube, and the other end of the piston rod is provided with a first limiting groove;

[0011] The push rod end is provided with a first control protrusion;

[0012] The first control protrusion is inserted into the first limiting groove.

[0013] As a preferred embodiment of the liquid pushing mechanism of this utility model, a second control protrusion is provided at one end of the piston rod;

[0014] The push rod end is provided with a second limiting groove.

[0015] The second control protrusion is inserted into the second limiting groove.

[0016] In a preferred embodiment of the liquid-pushing mechanism of this utility model, the push rod and the piston rod are connected by a limiting member, and the limiting member controls the relative sliding of the push rod and the piston rod.

[0017] As a preferred embodiment of the liquid pushing mechanism of this utility model, the limiting member includes a connecting rope disposed between the piston rod and the push rod;

[0018] The push rod and the piston rod are slidably connected, or the push rod and the piston rod are simultaneously slidably connected to the liquid storage tube.

[0019] As a preferred embodiment of the liquid pushing mechanism of this utility model, the limiting member includes a telescopic rod disposed between the piston rod and the push rod;

[0020] The push rod and the piston rod are slidably connected, or the push rod and the piston rod are simultaneously slidably connected to the liquid storage tube.

[0021] In a preferred embodiment of the liquid-pushing mechanism of this utility model, the relative displacement distance 'a' between the piston rod and the push rod is 1cm-8cm.

[0022] The beneficial effects of this liquid-pushing mechanism are as follows: there is a relative displacement between the piston rod and the push rod. When the push rod is relatively displaced relative to the piston rod, the moving speed of the push rod will increase. When the push rod contacts the piston rod, it will impact the piston rod, increasing the instantaneous moving speed of the piston rod. After that, the piston rod moves with the push rod.

[0023] Another objective of this invention is to provide a syringe that aims to change the state of piston movement.

[0024] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a syringe, including a liquid pushing mechanism, and further comprising;

[0025] A liquid inlet assembly, comprising an inlet pipe connected to the liquid storage pipe, and a first check valve disposed in the inlet pipe; and,

[0026] The liquid dispensing assembly includes a nozzle disposed at the end of the liquid storage pipe and a second one-way valve disposed in the nozzle;

[0027] The nozzle is connected to the liquid outlet.

[0028] In a preferred embodiment of the syringe described in this utility model, the liquid storage tube includes a sliding cavity and an inlet cavity;

[0029] The piston rod is slidably disposed in the sliding cavity, and the liquid outlet is located at the end of the sliding cavity and communicates with the nozzle;

[0030] One end of the liquid inlet chamber is connected to the sliding chamber, and the other end is connected to the liquid inlet pipe.

[0031] In a preferred embodiment of the syringe described in this utility model, a gripping shell is provided on the outside of the liquid storage tube, and a driving assembly is provided between the plunger and the gripping shell.

[0032] The beneficial effects of this utility model are as follows: there is a relative displacement between the piston rod and the push rod. When the push rod and the piston rod are relatively displaced, the moving speed of the push rod will increase. When the push rod contacts the piston rod, it will impact the piston rod. The impact on the piston rod can increase the pressure of the medicine sprayed out, making it easier to pierce the epidermis. Later, the piston rod moves with the push rod, which makes it easier to slowly introduce the medicine into the human body. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0034] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1.

[0035] Figure 2 This is a schematic diagram of the second morphological structure of this embodiment.

[0036] Figure 3 This is a schematic diagram of the third morphological structure of this embodiment.

[0037] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2.

[0038] Figure 5 This is a schematic diagram of the second morphological structure of this embodiment.

[0039] Figure 6 This is a schematic diagram of the third morphological structure of this embodiment two.

[0040] Figure 7 This is a schematic diagram of the overall structure of Embodiment 3.

[0041] Figure 8 This is a schematic diagram of the second morphological structure of this embodiment three.

[0042] Figure 9 This is a schematic diagram of the overall structure of Embodiment 4.

[0043] Figure 10 This is a schematic diagram of the second morphological structure of this embodiment four.

[0044] Figure 11 This is a schematic diagram of the overall structure of Embodiment 5.

[0045] Figure 12 This is a schematic diagram of the gripping part structure in Embodiment 5.

[0046] Figure 13 This is a cross-sectional structural diagram of Embodiment 5. Detailed Implementation

[0047] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0048] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0049] Reference Figures 1-3 This embodiment provides a liquid pushing mechanism, including a liquid storage component 100 and a pushing component 200.

[0050] The liquid storage assembly 100 includes a liquid storage tube 101 and a liquid outlet 102 disposed at the end of the liquid storage tube 101.

[0051] The actuating assembly 200 includes a piston rod 201 slidably disposed in the liquid storage tube 101. The piston rod 201 is sealed to the inner wall of the liquid storage tube 101. A sealing ring is sleeved on the piston rod 201, which seals the inner wall of the liquid storage tube 101. When the piston rod 201 reciprocates inside the liquid storage tube 101, it can draw or drain liquid from the inside of the liquid storage tube 101 through the liquid outlet 102.

[0052] The push assembly 200 also includes a push rod 202 that can be displaced relative to the piston rod 201. When the relative displacement reaches the end of the stroke, the push rod 202 will drive the piston rod 201 to move synchronously.

[0053] When draining, the push rod 202 and the piston rod 201 are in relative displacement. When the push rod 202 reaches the end of its stroke and collides with the piston rod 201, the impact on the piston rod 201 increases the pressure of the liquid being sprayed out. Then the push rod 202 drives the piston rod 201 to move synchronously to drain the liquid in the storage tube 101.

[0054] When liquid is pumped out, the push rod 202 and the piston rod 201 are in relative displacement. When the push rod 202 reaches the end of its stroke after the relative displacement, it drives the piston rod 201 to move synchronously, thereby completing the pumping action and facilitating the next drainage.

[0055] Furthermore, the relative displacement of the piston rod 201 and the push rod 202 ranges from 1cm to 8cm.

[0056] The piston rod 201 has one end sealed to the inside of the liquid storage tube 101, and the other end of the piston rod 201 is provided with a first limiting groove 201a. The end of the push rod 202 is provided with a first control protrusion 202a, which is inserted into the first limiting groove 201a and can contact the inner wall of the first limiting groove 201a. When the first control protrusion 202a slides in the first limiting groove 201a, the push rod 202 and the piston rod 201 are relatively displaced. When the first control protrusion 202a contacts the inner wall of the first limiting groove 201a, the push rod 202 reaches the end of its relative displacement and drives the piston rod 201 to move synchronously.

[0057] like Figure 1 The first limiting groove 201a is formed on the surface of the piston rod 201 end and is U-shaped. The first control protrusion 202a is set at the end of the push rod 202 and is L-shaped. The end of the first control protrusion 202a is inserted into the first limiting groove 201a and can slide in the first limiting groove 201a. When it moves to the end and contacts the first limiting groove 201a, it will drive the first limiting groove 201a to move synchronously.

[0058] Or such as Figure 2 The first limiting groove 201a is opened on the inner side of the end of the piston rod 201, and the first control protrusion 202a is inserted into the piston rod 201 and cooperates with the first limiting groove 201a.

[0059] Further, such as Figure 3 The first limiting groove 201a can be an annular groove formed by rotating a U-shaped groove, and the first control protrusion 202a can be an annular column formed by rotating an L-shaped protrusion. Depending on whether the annular groove is located on the surface of the piston rod 201 or inside the piston rod 201, the annular column either wraps around the piston rod 201 or is inserted into the piston rod 201.

[0060] Example 2

[0061] Reference Figures 4-6 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: one end of the piston rod 201 is provided with a second control protrusion 201b; the end of the push rod 202 is provided with a second limiting groove 202b, and the second control protrusion 201b is inserted into the second limiting groove 202b.

[0062] When the push rod 202 drives the second limiting groove 202b to move relative to the second control protrusion 201b, the push rod 202 and the piston rod 201 are in relative displacement. When the second limiting groove 202b contacts the second control protrusion 201b, the push rod 202 reaches the end of the stroke of the relative displacement and drives the piston rod 201 to move synchronously.

[0063] like Figure 4 The second limiting groove 202b is opened on the surface of the end of the push rod 202 and is U-shaped. The second control protrusion 201b is set at the end of the piston rod 201 and is L-shaped. The end of the second control protrusion 201b is inserted into the second limiting groove 202b and can slide in the second limiting groove 202b. When the second limiting groove 202b moves to the end, it contacts the second limiting protrusion and drives the second limiting protrusion to move synchronously.

[0064] Or such as Figure 5 The second limiting groove 202b is opened on the inner side of the end of the push rod 202, and the second control protrusion 201b is inserted into the push rod 202 to cooperate with the second limiting groove 202b.

[0065] Further, such as Figure 6 The second limiting groove 202b can be an annular groove formed by rotating a U-shaped groove, and similarly, the second control protrusion 201b can be an annular column formed by rotating an L-shaped protrusion. Depending on whether the annular groove is located on the surface of the push rod 202 or inside the push rod 202, the annular column either wraps around the push rod 202 or is inserted into the push rod 202.

[0066] The remaining structure is the same as that in Example 1.

[0067] Example 3

[0068] Reference Figure 7 and Figure 8 This is the third embodiment of the present invention. The difference between this embodiment and the first embodiment is that the push rod 202 and the piston rod 201 are connected by a limiting member 203, and the limiting member 203 controls the push rod 202 and the piston rod 201 to slide relative to each other.

[0069] The limiting member 203 includes a connecting rope 203a disposed between the piston rod 201 and the push rod 202.

[0070] like Figure 7The push rod 202 and the piston rod 201 are slidably connected. The end of the piston rod 201 is inserted into the push rod 202. One end of the connecting rope 203a is connected to the piston rod 201 and the other end is connected to the push rod 202.

[0071] Or such as Figure 8 The push rod 202 and the piston rod 201 are simultaneously slidably connected to the liquid storage tube 101. One end of the connecting rope 203a is connected to the piston rod 201, and the other end is connected to the push rod 202.

[0072] During drainage, the push rod 202 and piston rod 201 are in relative displacement. When the push rod 202 reaches the end of its stroke and collides with the piston rod 201, the impact on the piston rod 201 increases the pressure of the liquid being sprayed out. Then the push rod 202 drives the piston rod 201 to move synchronously to drain the liquid in the storage tube 101.

[0073] When liquid is pumped out, the push rod 202 and the piston rod 201 are in relative displacement. When the push rod 202 reaches the end of its stroke after the relative displacement, the connecting rope 203a is straightened, thereby driving the piston rod 201 to move synchronously, completing the pumping action and facilitating the next drainage.

[0074] The remaining structure is the same as that in Example 1.

[0075] Example 4

[0076] Reference Figure 9 and Figure 10 This is the fourth embodiment of the present utility model. The difference between this embodiment and the third embodiment is that the limiting member 203 includes a telescopic rod 203b disposed between the piston rod 201 and the push rod 202.

[0077] like Figure 9 The push rod 202 is slidably connected to the piston rod 201, and the end of the piston rod 201 is inserted into the push rod 202. One end of the telescopic rod 203b is connected to the piston rod 201, and the other end is connected to the push rod 202.

[0078] Or such as Figure 10 The push rod 202 and the piston rod 201 are simultaneously slidably connected to the liquid storage tube 101, and one end of the telescopic rod 203b is connected to the piston rod 201, and the other end is connected to the push rod 202.

[0079] During the drainage process, the push rod 202 and the piston rod 201 are in relative displacement. When the push rod 202 reaches the end of its stroke, that is, when the telescopic rod 203b is in a fully retracted state, the push rod 202 and the piston rod 201 collide. The impact on the piston rod 201 increases the pressure of the liquid being sprayed out. Then, the push rod 202 drives the piston rod 201 to move synchronously to drain the liquid from the storage tube 101.

[0080] When liquid is pumped out, the push rod 202 and the piston rod 201 are in relative displacement. When the push rod 202 reaches the end of its stroke, that is, when the telescopic rod 203b is fully extended, the push rod 202 drives the piston rod 201 to move synchronously, completing the pumping action and facilitating the next drainage.

[0081] The remaining structure is the same as that in Example 3.

[0082] Example 5

[0083] Reference Figures 11-13 This is the fifth embodiment of the present invention. This embodiment provides a syringe, which includes a liquid pushing mechanism, a liquid inlet assembly 300, and a liquid outlet assembly 400.

[0084] The liquid inlet assembly 300 includes a liquid inlet pipe 301 connected to the liquid storage pipe 101. The end of the liquid inlet pipe 301 communicates with the liquid storage pipe 101 but does not coincide with the liquid outlet 102. A first one-way valve 302 is provided in the liquid inlet pipe 301. The first one-way valve 302 in the liquid inlet pipe 301 enables the liquid medicine in the liquid inlet pipe 301 to enter the liquid storage pipe 101 in one direction. The liquid medicine in the liquid storage pipe 101 cannot pass through the first one-way valve 302 for backflow.

[0085] The liquid dispensing assembly 400 includes a nozzle 401 disposed at the end of the liquid storage tube 101, the nozzle 401 being overlapped and communicating with the liquid outlet 102, and a second one-way valve 402 disposed in the nozzle 401. The second one-way valve 402 in the nozzle 401 allows the liquid medicine in the liquid storage tube 101 to pass through the second one-way valve 402 in one direction and be sprayed out, while the medium outside the nozzle 401 cannot pass through the second one-way valve 402 and enter the liquid storage tube 101.

[0086] During use, the piston rod 201 reciprocates to perform suction and discharge actions. When suction is performed, the piston rod 201 moves outward to increase the internal space of the storage tube 101, thereby drawing the liquid medicine in the inlet tube 301 through the first one-way valve 302 into the storage tube 101. When discharge is performed, the piston rod 201 moves inward to reduce the internal space of the storage tube 101, thereby spraying the liquid medicine in the storage tube 101 out from the outlet hole 102 and the nozzle 401 to complete the injection of the liquid medicine.

[0087] Furthermore, the liquid storage tube 101 includes a sliding cavity 101a and an inlet cavity 101b; the piston rod 201 is slidably disposed in the sliding cavity 101a, and the liquid outlet 102 is located at the end of the sliding cavity 101a and communicates with the nozzle 401; one end of the inlet cavity 101b is connected to the sliding cavity 101a, and the other end is connected to the inlet tube 301.

[0088] The liquid medicine in the inlet pipe 301 is injected into the sliding chamber 101a from the inlet chamber 101b. The piston rod 201 moves in the sliding chamber 101a and finally sprays the liquid medicine out from the outlet hole 102 and the nozzle 401.

[0089] Furthermore, a grip shell 103 is provided on the outside of the liquid storage tube 101, and a drive assembly 500 is provided between the push rod 202 and the grip shell 103. The grip shell 103 includes a handle portion 103a and a mounting portion 103b. The liquid storage tube 101 is installed inside the mounting portion 103b, and the nozzle 401 extends out of the mounting portion 103b. The drive assembly 500 is installed in the mounting portion 103b and is made of a cylinder or electric rod. The reciprocating movement of the push rod 202 and the piston rod 201 is controlled by the extension and retraction of the end of the drive assembly 500.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A liquid-pushing mechanism, characterized in that: include, A liquid storage assembly (100) includes a liquid storage tube (101) and a liquid outlet (102) disposed at the end of the liquid storage tube (101); and, The push assembly (200) includes a piston rod (201) slidably disposed in the liquid storage tube (101) and a push rod (202) capable of relative displacement with respect to the piston rod (201). When the relative displacement reaches the end of the stroke, the push rod (202) will drive the piston rod (201) to move synchronously.

2. The liquid-pushing mechanism according to claim 1, characterized in that: One end of the piston rod (201) is sealed to the inside of the liquid storage tube (101), and the other end of the piston rod (201) is provided with a first limiting groove (201a). The push rod (202) has a first control protrusion (202a) at its end; The first control protrusion (202a) is inserted into the first limiting groove (201a).

3. The liquid-pushing mechanism according to claim 1 or 2, characterized in that: The piston rod (201) is provided with a second control protrusion (201b) at one end. The push rod (202) has a second limiting groove (202b) at its end. The second control protrusion (201b) is inserted into the second limiting groove (202b).

4. A liquid-pushing mechanism according to claim 1 or 2, characterized in that: The push rod (202) and the piston rod (201) are connected by a limiting member (203), and the limiting member (203) controls the push rod (202) and the piston rod (201) to slide relative to each other.

5. The liquid-pushing mechanism according to claim 4, characterized in that: The limiting member (203) includes a connecting rope (203a) disposed between the piston rod (201) and the push rod (202); The push rod (202) is slidably connected to the piston rod (201), or the push rod (202) and the piston rod (201) are simultaneously slidably connected to the liquid storage tube (101).

6. The liquid-pushing mechanism according to claim 4, characterized in that: The limiting member (203) includes a telescopic rod (203b) disposed between the piston rod (201) and the push rod (202). The push rod (202) is slidably connected to the piston rod (201), or the push rod (202) and the piston rod (201) are simultaneously slidably connected to the liquid storage tube (101).

7. The liquid-pushing mechanism according to any one of claims 1, 2, 5 or 6, characterized in that: The relative displacement of the piston rod (201) and the push rod (202) ranges from 1cm to 8cm.

8. A syringe, characterized in that: Including the liquid pushing mechanism as described in claim 7, and further comprising: A liquid inlet assembly (300) includes an inlet pipe (301) connected to the liquid storage pipe (101), and a first check valve (302) disposed in the inlet pipe (301); and, The liquid dispensing assembly (400) includes a nozzle (401) disposed at the end of the liquid storage pipe (101) and a second one-way valve (402) disposed in the nozzle (401). The nozzle (401) is connected to the liquid outlet (102).

9. The syringe according to claim 8, characterized in that: The liquid storage tube (101) includes a sliding cavity (101a) and a liquid inlet cavity (101b). The piston rod (201) is slidably disposed in the sliding cavity (101a), and the liquid outlet (102) is located at the end of the sliding cavity (101a) and communicates with the nozzle (401); One end of the liquid inlet chamber (101b) is connected to the sliding chamber (101a), and the other end is connected to the liquid inlet pipe (301).

10. The syringe according to claim 8 or 9, characterized in that: The liquid storage tube (101) is provided with a grip shell (103) on the outside, and a drive assembly (500) is provided between the push rod (202) and the grip shell (103).

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