Injection booster

Abstract

The invention discloses an injection booster which comprises a cylinder body, a push rod and a push rod. The button cover is connected with the near end of the barrel and comprises a first supporting wall and a first side wall which is arranged around the first supporting wall and is connected with the first supporting wall and the barrel, and a first containing space communicated with the interior of the barrel is defined by the first supporting wall, the first side wall and the barrel; the first supporting wall is provided with a first through hole communicated with the first accommodating space, and the first side wall is provided with a slot communicated with the first accommodating space; the push rod extends in the axial direction of the barrel, the far end of the push rod is inserted into the barrel through the first through hole and used for abutting against a piston rod of the injector, and the near end of the push rod is exposed out of the button cover and connected with the handle; a part of the button is located in the slot, and a part of the button is located in the first accommodating space; and the nut is arranged in the first accommodating space and is movably connected with the button cover. According to the design, the injection difficulty can be reduced, and uniform injection of the injector is achieved.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to an injection booster. Background Art

[0002] In the medical field, syringes are widely used. However, traditional manual injection methods have some limitations, such as uneven injection speed and high requirements for the hand strength of medical staff. Especially in some long-term and frequent injection scenarios, medical staff are prone to fatigue, and it may affect the accuracy and stability of the injection effect. In order to improve the convenience and quality of injection operations, injection boosters have emerged. However, the operation convenience of current injection boosters still needs to be further improved. Summary of the Invention

[0003] This application provides an injection booster that can reduce the difficulty of injection and achieve uniform injection of the syringe.

[0004] In a first aspect of an embodiment of this application, an injection booster is provided, including: a barrel, which is a hollow structure with both ends open. The distal end of the barrel is used to install a syringe, and the piston rod of the syringe is inserted into the barrel from the distal end of the barrel; a button cover, which is connected to the proximal end of the barrel. The button cover includes a first support wall and a first side wall that surrounds the first support wall and connects the first support wall and the barrel. A first accommodation space communicating with the inside of the barrel is formed by enclosing the first support wall, the first side wall, and the barrel. The first support wall is provided with a first through hole communicating with the first accommodation space, and the first side wall is provided with a slot communicating with the first accommodation space; a push rod, which extends along the axial direction of the barrel. The distal end of the push rod is inserted into the inside of the barrel through the first through hole and is used to abut against the piston rod of the syringe. The proximal end of the push rod is exposed outside the button cover and is connected to a handle; a button, part of which is located in the slot and part of which is located in the first accommodation space; a nut, which is arranged in the first accommodation space and is movably connected to the button cover. Wherein, when the injection booster is in the initial state where the button is not affected by external force, the nut is threadedly connected to the push rod so that the push rod can move along the axial direction of the barrel. When the button is pressed under the action of an external force, the button drives the nut to move and separates the nut from the push rod. When the external force disappears, the injection booster returns to the initial state.

[0005] Wherein, the nut is movably connected to the first side wall through an elastic member. When the button is pressed under the action of an external force, the elastic member contracts and separates the nut from the push rod. When the external force disappears, the elastic member resets and the nut returns to the initial position and is threadedly connected to the push rod.

[0006] Among them, the button includes:

[0007] A pressing part, which is located and limited in the slot;

[0008] A force - applying part, which is located in the first accommodating space and is connected to the pressing part. The force - applying part surrounds the periphery of the push rod and has an arc - shaped structure. Both ends of the force - applying part are used to abut against the nut to transmit the acting force.

[0009] Among them, the nut and the force - applying part surround the periphery of the push rod. The nut includes a first surface and a second surface arranged opposite to each other. The first surface faces the button, and the second surface faces the first side wall;

[0010] The first surface is provided with an arc - shaped groove. The arc - shaped groove is provided with a thread for driving connection with the push rod. The first surface on both sides of the arc - shaped groove is used to abut against the button to receive the acting force transmitted by the button. The second surface is connected to the first side wall through an elastic member.

[0011] Among them, the elastic member includes a spring. The second surface is convexly provided with a connecting post. One end of the spring is sleeved on the connecting post, and the other end is connected to the first side wall.

[0012] Among them, the button cover further includes:

[0013] A positioning structure, which is located in the first accommodating space and convexly provided on the first supporting wall. The positioning structure has an arc - shaped structure and is arranged between the first through - hole and the force - applying part. Both end faces of the positioning structure are used to abut against the first surface of the nut in the initial state.

[0014] Among them, the positioning structure is provided with a guiding groove. The inner side wall of the force - applying part is convexly provided with a first protrusion inserted into the guiding groove. The first surface of the nut is convexly provided with a second protrusion inserted into the guiding groove.

[0015] Among them, it further includes:

[0016] A stop washer, which is arranged in the first accommodating space and sleeved on the push rod. At the same time, the stop washer is located between the cylinder body and the nut.

[0017] Among them, it further includes:

[0018] A push plate, which is movably connected to the distal end of the push rod.

[0019] Wherein, the push plate is provided with a through mounting hole, the distal end of the push rod is located in the mounting hole and is in clearance fit with the mounting hole. The mounting hole includes a first hole section and a second hole section which are arranged in sequence away from the push rod in the axial direction and are communicated with each other. The diameter of the second hole section is larger than that of the first hole section, and the diameter of the first hole section is smaller than the diameter of the part of the push rod outside the mounting hole.

[0020] A locking member is located in the mounting hole and is connected to the distal end of the push rod. The diameter of the locking member is between the diameter of the first hole section and the diameter of the second hole section.

[0021] Wherein, it further includes:

[0022] A fixed cover is sleeved on the distal end of the barrel. The fixed cover includes a second support wall and a second side wall which is arranged around the second support wall and connects the second support wall and the barrel. A second accommodation space communicated with the inside of the barrel is formed by enclosing the second support wall, the second side wall and the barrel. At the same time, the second support wall is provided with a second through hole which matches the flange on the periphery of the syringe barrel in the syringe. On the side of the second support wall facing the barrel, limiting grooves are distributed on both sides of the second through hole, so that when the flange enters the second accommodation space and rotates in the first rotation direction while closely adhering to the second support wall, the flange slides into and is limited in the limiting grooves.

[0023] The beneficial effects are as follows: On the one hand, the injection booster of the present application can convert the rotational motion into linear motion. Medical staff can achieve injection by rotating the push rod, which can ensure the uniformity of injection and improve the accuracy and stability of injection administration. On the other hand, during the whole injection process, medical staff only need to rotate the handle and operate the button. And after the injection is completed, the push rod can be directly pulled back to the initial position without rotating the push rod, which can reduce the difficulty of injection, optimize the injection process, reduce the burden on medical staff and improve the level of medical services. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0025] Figure 1 is a schematic structural diagram of a syringe in the prior art;

[0026] Figure 2 is a schematic structural diagram of an embodiment of the injection booster of the present application;

[0027] Figure 3 is Figure 2 The structural schematic diagram when the injection booster in [[]] is assembled with the syringe;

[0028] Figure 4 is Figure 2 The exploded structural schematic diagram of the injection booster in [[]];

[0029] Figure 5 is Figure 2 The structural schematic diagram when the button cover, button and nut in [[]] are assembled together;

[0030] Figure 6 is Figure 5 The structural schematic diagram of the button cover in [[]];

[0031] Figure 7 is Figure 5 The structural schematic diagram of the button in [[]];

[0032] Figure 8 is Figure 5 The structural schematic diagram of the nut in [[]];

[0033] Figure 9 The structural schematic diagram of the connection between the distal end of the push rod and the push plate;

[0034] Figure 10 is Figure 2 The structural schematic diagram when the fixed cover in [[]] is at the first angle;

[0035] Figure 11 is Figure 2 The structural schematic diagram when the fixed cover in [[]] is at the second angle. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] It should be noted that the terms "first" and "second" in this application are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0038] In the present invention, "distal end" and "proximal end" are terms of orientation, which are commonly used terms in the field of interventional medical devices. Among them, "distal end" refers to the end far from the operator during the surgical process, and "proximal end" refers to the end close to the operator during the surgical process. "Axial direction" refers to the direction parallel to the line connecting the centers of the distal end and the proximal end of the medical device; "radial direction" refers to the direction perpendicular to the above-mentioned "axial direction".

[0039] Before introducing the injection booster of this application, the syringe will be briefly introduced. Refer to Figure 1 , the syringe 1 includes a syringe barrel 11, a flange 12 arranged on the periphery of the syringe barrel 11, a piston rod 13 inserted in the syringe barrel 11, and a pressing plate 14 connected to one end of the piston rod 13. During injection, medical staff insert an injection needle at the distal end of the syringe barrel 11, then pull the piston rod 13 to suck the injection liquid into the syringe barrel 11, and finally push the piston rod 13 by applying pressure to the pressing plate 14 to complete the injection.

[0040] Considering that currently, during injection by medical staff, there are defects such as uneven injection speed and easy fatigue, this application designs an injection booster to optimize the injection effect, reduce the burden on medical staff, and improve the level of medical services.

[0041] Refer to Figures 2 to 6 , in an embodiment of this application, the injection booster 100 includes a cylinder body 110, a button cover 120, a push rod 130, a button 140, and a nut 150.

[0042] The cylinder body 110 has a hollow structure with both ends open. The distal end of the cylinder body 110 is used to install the syringe 1, and the piston rod 13 of the syringe 1 is inserted into the cylinder body 110 from the distal end of the cylinder body 110. During the injection process by medical staff, after sucking the injection liquid into the syringe barrel 11, the piston rod 13 is inserted into the cylinder body 110 from the distal end of the cylinder body 110, and then the syringe 1 is fixed on the cylinder body 110.

[0043] The button cover 120 is connected to the proximal end of the cylinder 110. The button cover 120 includes a first support wall 121 and a first side wall 122 that surrounds the first support wall 121 and connects the first support wall 121 and the cylinder 110. A first accommodation space communicating with the inside of the cylinder 110 is enclosed among the first support wall 121, the first side wall 122, and the cylinder 110. The first support wall 121 is provided with a first through hole 1211 communicating with the first accommodation space, and the first side wall 122 is provided with a slot 1221 communicating with the first accommodation space.

[0044] The push rod 130 extends along the axial direction of the cylinder 110. The distal end of the push rod 130 is inserted into the inside of the cylinder 110 through the first through hole 1211 for abutting against the piston rod 13 of the syringe 1, and the proximal end of the push rod 130 is exposed outside the button cover 120 and connected to the handle 131. Specifically, the push rod 130 is coaxially arranged with the cylinder 110, and the push rod 130 can move relative to the cylinder 110 in the extending direction. When the piston rod 13 is inserted into the cylinder 110 from the distal end of the cylinder 110, under the action of an external force, the push rod 130 moves towards the cylinder 110 until it abuts against the pressing plate 14 in the syringe 1. Then, as the push rod 130 continues to move towards the cylinder 110, the piston rod 13 squeezes the injection liquid in the syringe barrel 11, thereby completing the injection. The movement principle of the push rod 130 can be referred to the following introduction.

[0045] The button 140 is partially located in the slot 1221 and partially located in the first accommodation space. Among them, during the injection process, medical staff can press the button 140 or release the button 140.

[0046] The nut 150 is arranged in the first accommodation space and is movably connected to the button cover 120, that is, the nut 150 can move relative to the button cover 120.

[0047] Among them, when the injection booster 100 is in the initial state where the button 140 is not subject to an external force, the nut 150 is threadedly connected to the push rod 130 so that the push rod 130 can move along the axial direction of the cylinder 110. When the button 140 is pressed under the action of an external force, the button 140 drives the nut 150 to move and separates the nut 150 from the push rod 130. When the external force disappears, the injection booster 100 returns to the initial state.

[0048] Specifically, when no external force is applied to the button 140 by medical staff, the nut 150 and the push rod 130 are connected by a threaded drive. When the push rod 130 is rotated by the handle 131, the push rod 130 can move towards the cylinder 110 in the extending direction, so that the push rod 130 can push the piston rod 13 to move within the syringe barrel 11. When the button 140 is pressed, the button 140 drives the nut 150 to move and separates the nut 150 from the push rod 130. At this time, under the action of an external force, the push rod 130 can be pulled back to its original position. After the button 140 is released, the nut 150 is reconnected to the push rod 130 by a threaded drive.

[0049] For better understanding, the following introduces the injection process using the injection booster 100:

[0050] In the initial state, the button 140 is not subjected to any external force. The medical staff installs the syringe 1 filled with the injection solution at the distal end of the cylinder 110, where the piston rod 13 in the syringe 1 is inserted into the cylinder 110. Then, the medical staff rotates the push rod 130 through the handle 131. Since the nut 150 and the push rod 130 are connected by a threaded drive, as the push rod 130 rotates, the push rod 130 will advance towards the cylinder 110 until the push rod 130 abuts against the pressing plate 14 in the syringe 1. Then, as the medical staff continues to rotate the push rod 130, the push rod 130 will continue to advance towards the cylinder 110, thereby driving the piston rod 13 to squeeze the injection solution in the syringe barrel 11 until the injection is completed. After the injection is completed, the medical staff presses the button 140. At this time, under the drive of the button 140, the nut 150 is separated from the push rod 130, and the medical staff can directly pull the push rod 130 back to its original position before injection. Then, the medical staff releases the button 140. Due to the disappearance of the external force, the nut 150 and the push rod 130 return to the state of being connected by a threaded drive again, preparing for the next injection.

[0051] As can be seen from the above, on the one hand, the injection booster 100 of the present application can convert rotational motion into linear motion. The medical staff can achieve injection by rotating the push rod 130, which can ensure the uniformity of injection and improve the accuracy and stability of injection administration. On the other hand, during the entire injection process, the medical staff only needs to rotate the handle 131 and operate the button 140. After the injection is completed, the push rod 130 can be directly pulled back to the initial position without rotating the push rod 130, which can reduce the difficulty of injection, optimize the injection process, reduce the burden on medical staff, and improve the level of medical services.

[0052] In one embodiment, the connection between the push rod 130 and the nut 150 is achieved through a T-shaped drive thread.

[0053] Refer to Figures 2 to 5, in one embodiment, the first side wall 122 is sleeved around the periphery of the proximal end of the cylinder 110. At the same time, the first side wall 122 and the cylinder 110 can be connected by a threaded connection, or by an interference fit, or by a snap connection through the cooperation of a slot and a block, or by a magnetic attraction connection. In short, the present application does not limit the connection method between the button cover 120 and the cylinder 110.

[0054] Refer to Figure 2 , in one embodiment, in order to facilitate observing the abutting situation between the push rod 130 and the pressing plate 14 and the movement situation of the push rod 130 in the cylinder 110, a plurality of observation windows 111 can also be opened on the peripheral wall of the cylinder 110. Through the observation window 111, it can be observed whether the push rod 130 abuts against the pressing plate 14.

[0055] Refer to Figure 5 , in one embodiment, the nut 150 is movably connected to the first side wall 122 through an elastic member 160. When the button 140 is pressed under an external force, the elastic member 160 contracts to separate the nut 150 from the push rod 130. When the external force disappears, the elastic member 160 resets to return the nut 150 to its initial position and then threadedly connect with the push rod 130. The elastic member 160 can be a spring or other components with certain elasticity. The present application does not limit the specific structure of the elastic member 160.

[0056] Refer to Figures 5 to 7 , the button 140 includes a pressing portion 141 and a force application portion 142.

[0057] The pressing portion 141 is located and limited in the slot 1221. The force application portion 142 is located in the first accommodation space and is connected to the pressing portion 141. The force application portion 142 surrounds the periphery of the push rod 130 and has an arc-shaped structure. The two ends of the force application portion 142 are used to abut against the nut 150 to transmit the acting force. After the medical staff applies an acting force to the pressing portion 141, the force application portion 142 moves towards the nut 150 and abuts against the nut 150 to transmit the acting force to the nut 150, thereby causing the nut 150 to move away from the push rod 130 until the nut 150 is separated from the push rod 130. Among them, the middle position of the pressing portion 141 and the force application portion 142 is connected, and both ends of the force application portion 142 are used to abut against the nut 150, so that the force application portion 142 can evenly transmit the acting force to the nut 150 to ensure the stable movement of the nut 150. However, in other embodiments, one end of the force application portion 142 can also be connected to the pressing portion 141, and the other end is used to abut against the nut 150, as long as the force application portion 142 can transmit the acting force to the nut 150.

[0058] It should be noted that the present application does not limit the shape of the force application portion 142. For example, in other embodiments, the force application portion 142 can be L-shaped, as long as the force application portion 142 can transmit the acting force on the pressing portion 141 to the nut 150.

[0059] In one embodiment, the pressing portion 141 and the force application portion 142 are integrally formed to ensure the overall strength of the button 140.

[0060] Referring to Figures 5 to 8 , in one embodiment, the nut 150 and the force application portion 142 surround the outer periphery of the push rod 130. The nut 150 includes a first surface 151 and a second surface 152 arranged opposite to each other. The first surface 151 faces the button 140, and the second surface 152 faces the first side wall 122; an arc-shaped groove 153 is provided on the first surface 151, and a thread (not shown in the figure) for driving connection with the push rod 130 is provided in the arc-shaped groove 153. The first surface 151 on both sides of the arc-shaped groove 153 is used to abut against the button 140 to receive the acting force transmitted by the button 140; at the same time, the second surface 152 is connected to the first side wall 122 through an elastic member 160. Specifically, when the injection booster 100 is in the initial state where the button 140 is not subjected to external force, the elastic member 160 is in a compressed state. After the medical staff presses the button 140, both ends of the force application portion 142 abut against the first surface 151 on both sides of the arc-shaped groove 153, thereby transmitting the external acting force to the nut 150, and then the elastic member 160 continues to be compressed, and the nut 150 is separated from the push rod 130. When the medical staff releases the button 140, the elastic member 160 resets, and the nut 150 moves towards the push rod 130 until it is in a state of driving connection with the push rod 130 again.

[0061] Referring to Figure 5 and Figure 8 , the elastic member 160 includes a spring 161. A connecting column 154 protrudes from the second surface 152. One end of the spring 161 is sleeved on the connecting column 154, and the other end is connected to the first side wall 122. The arrangement of the connecting column 154 can prevent the spring 161 from detaching from between the nut 150 and the first side wall 122. In one embodiment, in order to ensure the stable movement of the nut 150, the number of the connecting columns 154 is set to be multiple, for example Figure 8 the number of the connecting columns 154 in

[0062] Referring to Figure 5 and Figure 6, the button cover 120 further includes a positioning structure 124. The positioning structure 124 is located in the first accommodation space and protrudes from the first support wall 121. The positioning structure 124 is in an arc structure and is disposed between the first through hole 1211 and the force application portion 142. The two ends of the positioning structure 124 are used to abut against the first surface 151 of the nut 150 in the initial state.

[0063] Specifically, when the injection syringe 100 is in the initial state where the button 140 is not subjected to external force, under the action of the elastic member 160, the first surface 151 of the nut 150 abuts against the two ends of the positioning structure 124. At the same time, the nut 150 is threadedly connected to the push rod 130. When the button 140 is pressed, the elastic member 160 is compressed. While the nut 150 is separated from the push rod 130, its two ends are also separated from the positioning structure 124. After the button 140 is released, the nut 150 moves towards the positioning structure 124 until the nut 150 abuts against the positioning structure 124, that is, the nut 150 returns to the initial position under the restriction of the positioning structure 124. When the nut 150 is in the initial position, the circle formed by the groove surface of the arc-shaped groove 153 of the nut 150 and the inner surface of the positioning structure 124 is concentric with the first through hole 1211.

[0064] In the above setting, the positioning structure 124 is used to limit the initial position of the nut 150, which can prevent the nut 150 from excessively squeezing the push rod 130 in the initial position and affecting the axial movement of the push rod 130. It should be noted that in other embodiments, the positioning structure 124 may not be provided. In this case, after the button 140 is released, the nut 150 moves towards the push rod 130 until it abuts against the push rod 130, that is, the initial position where the nut 150 returns is defined by the push rod 130.

[0065] Refer to Figure 5 and Figure 6 , the positioning structure 124 is provided with a guiding groove 1241. The guiding groove 1241 is located outside the first through hole 1211 and extends along a straight line direction. The inner side wall of the force application portion 142 protrudes with a first protrusion 143 inserted into the guiding groove 1241. The first surface 151 of the nut 150 protrudes with a second protrusion 155 inserted into the guiding groove 1241. The guiding groove 1241, the first protrusion 143, and the second protrusion 155 are used to guide the nut 150 to move relative to the button 140 along a preset direction, ensuring the smooth operation of the nut 150.

[0066] In one embodiment, in order to further improve the movement smoothness of the nut 150, the number of the guiding grooves 1241 is set to two. The two guiding grooves 1241 are distributed on both sides of the first through hole 1211 and are arranged in parallel. Correspondingly, two first protrusions 143 are protruded from the inner side wall of the force application portion 142, and the two first protrusions 143 are respectively inserted into the two guiding grooves 1241. Two second protrusions 1522 are protruded from the first surface 151 of the nut 150, and the two second protrusions 1522 are respectively inserted into the two guiding grooves 1241. It should be noted that in other embodiments, the number of the guiding grooves 1241, the first protrusions 143, and the second protrusions 155 can all be one, or the guiding grooves 1241, the first protrusions 143, and the second protrusions 155 can also be not provided.

[0067] Referring to Figure 4 , the syringe 1 further includes a stop washer 170. The stop washer 170 is arranged in the first accommodating space and sleeved on the push rod 130. At the same time, the stop washer 170 is located between the barrel 110 and the nut 150. In this setting, the stop washer 170 is used to limit the axial offset of the nut 150, and the nut 150 is limited between the stop washer 170 and the first support wall 121 to prevent the nut 150 from shaking axially. It should be noted that the stop washer 170 can also be not provided in other embodiments.

[0068] Referring to Figure 4 and Figure 9 , the injection booster 100 further includes a push plate 180. The push plate 180 is movably connected to the distal end of the push rod 130. Specifically, the push plate 180 can increase the contact area between the push rod 130 and the pressing plate 14, ensuring that the push rod 130 can push the push rod 130 more smoothly. At the same time, in order to prevent the push rod 130 from driving the push plate 180 to rotate, the push plate 180 is movably connected to the distal end of the push rod 130. Thus, after the push plate 180 abuts against the pressing plate 14, no matter how the push rod 130 rotates, the push plate 180 can always remain stationary relative to the pressing plate 14. It should be noted that in other embodiments, the push plate 180 can also be not provided. In this case, the push rod 130 can be set to directly abut against the pressing plate 14.

[0069] Referring to Figure 9, the push plate 180 is provided with a through mounting hole 181. The distal end of the push rod 130 is located in the mounting hole 181 and is in clearance fit with the mounting hole 181. The mounting hole 181 includes a first hole section 1811 and a second hole section 1812 which are arranged in sequence axially away from the push rod 130 and communicate with each other. The diameter of the second hole section 1812 is larger than that of the first hole section 1811, and the diameter of the first hole section 1811 is smaller than the diameter of the part of the push rod 130 outside the mounting hole 181. At the same time, the injection booster 100 further includes a locking member 182. The locking member 182 is located in the mounting hole 181 and is connected to the distal end of the push rod 130. The diameter of the locking member 182 is between the diameter of the first hole section 1811 and the diameter of the second hole section 1812. During assembly, first insert the distal end of the push rod 130 into the mounting hole 181 from one side of the push plate 180, and then place the locking member 182 into the mounting hole 181 from the other side of the push plate 180 and install it on the distal end of the push rod 130. Since the diameter of the locking member 182 is larger than the diameter of the first hole section 1811, the locking member 182 can prevent the distal end of the push rod 130 from disengaging from the mounting hole 181 after being inserted into the mounting hole 181. At the same time, since the distal end of the push rod 130 is in clearance fit with the mounting hole 181, the push plate 180 will not rotate with the rotation of the push rod 130.

[0070] Wherein, the locking member 182 can be a screw or a pin, and the present application does not limit the specific structure of the locking member 182.

[0071] Refer to Figure 4 、 Figure 10 And Figure 11 , the injection booster 100 further includes a fixing cover 190. The fixing cover 190 is sleeved on the distal end of the barrel 110. The fixing cover 190 includes a second support wall 191 and a second side wall 192 which is arranged around the second support wall 191 and connects the second support wall 191 and the barrel 110. A second accommodation space communicating with the inside of the barrel 110 is formed by enclosing the second support wall 191, the second side wall 192 and the barrel 110. At the same time, the second support wall 191 is provided with a second through hole 1911, and the second through hole 1911 matches the flange 12 outside the syringe barrel 11 in the syringe 1. The second support wall 191 is provided with limiting grooves 1912 distributed on both sides of the second through hole 1911 on the side facing the barrel 110, so that when the flange 12 enters the second accommodation space and rotates towards the first rotation direction while closely adhering to the second support wall 191, the flange 12 slides into and is limited in the limiting grooves 1912.

[0072] Specifically, after the medical staff sends the flange 12 of the syringe 1 from the second through hole 1911 to the second accommodation space, the medical staff rotates the syringe barrel 11 in the first rotation direction, so that the flange 12 is closely attached to the second support wall 191 and rotates, so that the flange 12 slides into and is limited in the limiting groove 1912, thereby locking the syringe 1 and the fixed cover 190. After the injection is completed, the medical staff rotates the syringe barrel 11 in the second rotation direction opposite to the first rotation direction, so that the flange 12 is disengaged from the limiting groove 1912, and finally the flange 12 is disengaged from the fixed cover 190 through the second through hole 1911, thereby realizing the separation between the syringe 1 and the injection booster 100. Among them, the first rotation direction is preferably the clockwise direction. Among them, along the first rotation direction, the depth of the limiting groove 1912 gradually increases, so that under the action of an external force, the flange 12 can slide into and be limited in the limiting groove 1912.

[0073] In one embodiment, the fixed cover 190 and the barrel 110 are detachably connected, so that the corresponding fixed cover 190 can be replaced with a matching one for syringes 1 of different specifications. The fixed cover 190 and the barrel 110 can be connected by screw drive, or by interference fit, or by clamping through the cooperation of a clamping groove and a clamping block, or by magnetic attraction. In short, the present application does not limit the connection method between the fixed cover 190 and the barrel 110.

[0074] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. An injection booster, characterized in that: The injection booster comprises: The barrel is a hollow structure with two ends open, the distal end of the barrel is used to install the syringe, and the piston rod of the syringe is inserted into the barrel from the distal end of the barrel; A button cover connected to the proximal end of the barrel, the button cover comprising a first supporting wall and a first side wall arranged around the first supporting wall and connecting the first supporting wall and the barrel, the first supporting wall, the first side wall and the barrel enclose a first accommodating space communicating with the interior of the barrel, the first supporting wall is provided with a first through hole communicating with the first accommodating space, and the first side wall is provided with a slot communicating with the first accommodating space; A push rod extending along the axial direction of the barrel, wherein the distal end of the push rod is inserted into the barrel through the first through hole and is used to abut against the piston rod of the syringe, and the proximal end of the push rod is exposed outside the button cover and connected to the handle; A button, partly located in the slot and partly located in the first accommodating space; A nut, disposed in the first accommodating space and movably connected to the button cover; Among them, when the injection booster is in the initial state where the button is not subject to external force, the nut and the push rod are connected by threads so that the push rod can move along the axial direction of the barrel. When the button is pressed under the action of external force, the button drives the nut to move and separates the nut from the push rod. When the external force disappears, the injection booster returns to the initial state.

2. The injection booster according to claim 1, characterized in that: The nut is movably connected to the first side wall via an elastic member. When the button is pressed under the action of an external force, the elastic member contracts to separate the nut from the push rod. When the external force disappears, the elastic member resets to return the nut to its initial position and then connects to the push rod via a thread.

3. The injection booster according to claim 1, characterized in that: The buttons include: A pressing portion, located and limited in the slot; The force-applying portion is located in the first accommodating space and connected to the pressing portion. The force-applying portion is arranged around the periphery of the push rod and has an arc-shaped structure. Two ends of the force-applying portion are used to abut against the nut to transmit the force.

4. The injection booster according to claim 3, characterized in that: The nut and the force-applying portion are disposed around the periphery of the push rod, and the nut includes a first surface and a second surface disposed opposite to each other, the first surface is disposed toward the button, and the second surface is disposed toward the first side wall; The first surface is provided with an arc-shaped groove, and the arc-shaped groove is provided with a thread for transmission connection with the push rod. The first surfaces located on both sides of the arc-shaped groove are used to abut against the button to receive the force transmitted by the button, and the second surface is connected to the first side wall through an elastic member.

5. The injection booster according to claim 4, characterized in that: The elastic member comprises a spring, a connecting column is protruding from the second surface, one end of the spring is sleeved on the connecting column, and the other end of the spring is connected to the first side wall.

6. The injection booster according to claim 4, characterized in that: The button cover further comprises: A positioning structure is located in the first accommodating space and protrudes on the first supporting wall. The positioning structure is an arc-shaped structure and is arranged between the first through hole and the force-applying portion. The two end surfaces of the positioning structure are used to abut against the first surface of the nut in the initial state.

7. The injection booster according to claim 6, characterized in that: The positioning structure is provided with a guide groove, the inner side wall of the force applying portion is provided with a first protrusion inserted into the guide groove, and the first surface of the nut is provided with a second protrusion inserted into the guide groove.

8. The injection booster according to claim 1, characterized in that: Also includes: A stop washer is arranged in the first accommodating space and sleeved on the push rod, and the stop washer is located between the cylinder and the nut; A push plate is movably connected to the far end of the push rod.

9. The injection booster according to claim 8, characterized in that: The push plate is provided with a through mounting hole, the distal end of the push rod is located in the mounting hole and is in clearance fit with the mounting hole, the mounting hole comprises a first hole section and a second hole section which are sequentially arranged away from the push rod in the axial direction and are connected to each other, the diameter of the second hole section is larger than the diameter of the first hole section, and the diameter of the first hole section is smaller than the diameter of the push rod outside the mounting hole, A locking member is located in the mounting hole and connected to the distal end of the push rod, wherein the diameter of the locking member is between the diameter of the first hole segment and the diameter of the second hole segment.

10. The injection booster according to claim 1, characterized in that: Also includes: A fixed cover is sleeved on the distal end of the barrel, the fixed cover includes a second support wall and a second side wall arranged around the second support wall and connecting the second support wall and the barrel, the second support wall, the second side wall and the barrel form a second accommodating space connected to the interior of the barrel, and the second support wall is provided with a second through hole, the second through hole matches the flange on the periphery of the injection barrel in the syringe, and the second support wall is provided with limiting grooves distributed on both sides of the second through hole on the side facing the barrel, so that when the flange enters the second accommodating space and rotates in the first rotation direction close to the second support wall, the flange slides into and is limited in the limiting groove.

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