Nasal feeding injection device and injection method thereof

Abstract

The invention relates to the technical field of medical instruments, and provides a nasal feeding push injection device and a push injection method.The side edge of a push rod is provided with a kneading piece, the first end of the kneading piece is provided with a locking piece, the movable end of the locking piece is arranged on the push rod, the second end of the kneading piece is connected with a tube body, and the nasal feeding push injection device further comprises a driving piece; when external force is applied to the kneading piece, the first end of the kneading piece gets close to the second end, meanwhile, the driving piece drives the locking piece to be switched from the first state to the second state, and the locking piece drives the push rod to move towards the injection end of the pipe body. The hand fatigue can be remarkably relieved, force is repeatedly applied to the kneading piece, the first end of the kneading piece gets close to the second end of the kneading piece, the dosage can be controlled, and the injection speed can be precisely adjusted. For some situations needing slow injection to ensure drug absorption or avoid adverse reactions, an operator can stably control the descending speed of the push rod.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a nasogastric infusion device and an infusion method thereof. Background Art

[0002] An infusion device is a commonly used medical device, including a tube body and a push rod, similar to the common 200 ml large syringe we use. The tube body has two openings, one opening is the push handle end, and the other opening is the injection end. The push rod is arranged in the tube body and can reciprocate between the push handle end and the injection end to suck or inject liquid. The liquid is sucked or injected in or out from the injection end. The push rod of the common large-dose infusion device is usually a simple straight rod structure. During the long-distance pushing process, there is a lack of an effective labor-saving mechanism. When medical staff operate, they can only rely on the grip and thrust of the hand to push the push rod. Prolonged operation can easily lead to hand fatigue, and it is difficult to achieve an efficient and stable pushing action during the pushing process.

[0003] Especially for the infusion device connected to the nasogastric tube, which is used to send liquid food into the stomach. However, because the liquid food has high viscosity and the tube body has a large capacity, the infusion is relatively strenuous. Moreover, in actual operation, one hand needs to pinch the connection between the nasogastric tube and the infusion device, and the other hand operates alone. It is very strenuous to pinch and press such a large-dose infusion device with one hand. Therefore, there is a need for an infusion device that is convenient for single-handed operation and labor-saving for pinching and pressing. Summary of the Invention

[0004] The purpose of the present invention is to provide a nasogastric infusion device and an infusion method thereof to solve the problems in the prior art, which can not only be operated with one hand, is labor-saving for pinching and pressing, but also can achieve an efficient and stable pushing action.

[0005] The present invention provides a nasogastric infusion device, including a tube body and a push rod. A pinch member is arranged on the side of the push rod. A locking member is arranged at the first end of the pinch member. The movable end of the locking member is arranged on the push rod. The second end of the pinch member is connected to the tube body, wherein:

[0006] The locking member has a first state and a second state. When the locking member is in the first state, the locking member is separated from the push rod. When the locking member is in the second state, the locking member is connected to the push rod;

[0007] It further includes a driving member for driving the locking member to switch between the first state and the second state;

[0008] When an external force is applied to the pinch member, the first end of the pinch member approaches the second end. At the same time, the driving member drives the locking member to switch from the first state to the second state, and the locking member drives the push rod to move towards the injection end of the tube body.

[0009] In the nasogastric feeding push injection device as described above, preferably, the kneading member includes a first component and a second component, the first component is hinged to the second component, and a first elastic member is provided at the hinge between the first component and the second component.

[0010] A nasogastric feeding push injection device as described above, wherein preferably, the locking member includes a card block, and the card block is arranged on the push rod through, when the locking member is in a first state, there is a preset distance between the inner wall surface of the card block and the push rod, and when the locking member is in a second state, the inner wall surface of the card block facing away from the driving member abuts against the push rod.

[0011] A nasogastric feeding push injection device as described above, wherein, preferably, a plurality of slots are provided on the side of the push rod facing away from the kneading piece, and a protrusion is provided on the side of the block facing the slot, and when the locking piece is in the second state, the protrusion is pressed into the slot.

[0012] In the nasogastric feeding push injection device as described above, preferably, a friction layer is provided on the outer wall surface of the push rod and the inner wall surface of the block.

[0013] A nasogastric feeding push injection device as described above, wherein, preferably, a shell is provided on the outside of the locking member, the shell is rotatably connected to the first component, a first through hole for the push rod to pass through is opened on the shell, and a first opening portion is provided on the side of the shell facing the first component.

[0014] In the nasogastric feeding push injection device as described above, preferably, a second elastic member is connected to the side of the locking member facing away from the driving member, and the other end of the second elastic member is connected to the shell.

[0015] A nasogastric feeding push injection device as described above, wherein preferably, the driving member includes a pull rope and a third component, the third component is hinged to one end of the first component facing away from the locking member, a third elastic member is provided at the hinge between the first component and the third component, the connecting end of the first component and the third component is bent toward one side of the tube body to form a bending portion, one end of the pull rope is connected to the locking member, and the other end of the pull rope is connected to the second component via the bending portion.

[0016] A nasogastric feeding push injection device as described above, wherein, preferably, a cover body is provided on the tube body, the second component is rotatably connected to the cover body, a second through hole for the push rod to pass through is provided on the cover body, and a third through hole is also provided on the cover body.

[0017] The present invention also provides a push injection method, which uses the above-mentioned nasogastric feeding push injection device to perform push injection, comprising the following steps:

[0018] When the tube body is filled with liquid food or liquid, apply force to the kneading piece. The first end of the kneading piece approaches the second end. During this process, the driving piece drives the locking piece to switch from the first state to the second state;

[0019] When the locking piece is in the second state, the locking piece locks with the push rod. Continue to apply force to the kneading piece, and the locking piece drives the push rod to move towards the injection end of the tube body;

[0020] Cancel the application of force. The locking piece switches from the second state to the first state, the locking piece unlocks with the push rod, and the kneading piece returns to its original position. Repeat the above steps until the liquid food or liquid in the tube body is completely injected.

[0021] Compared with the prior art, in the present invention, by arranging a kneading piece on the side of the push rod, during the kneading process, the locking piece is connected to the push rod and drives the push rod to descend, which is more labor-saving than applying force to the end of the push rod;

[0022] The present invention utilizes the lever principle to transfer the force arm to the side of the push rod, significantly reducing the force required for the operator to knead, and can significantly relieve hand fatigue; in addition, by repeatedly applying force to the kneading piece to make the first end of the kneading piece approach the second end, not only can the dosage be controlled, but also the injection speed can be accurately adjusted. For some situations where slow injection is required to ensure drug absorption or avoid adverse reactions, such as intravenous injection of some highly irritating drugs, the operator can stably control the descending speed of the push rod through a steady and delicate kneading action. Description of the Drawings

[0023] Figure 1 is the front view of the nasogastric injection device provided by the embodiment of the present invention;

[0024] Figure 2 is the perspective view of the nasogastric injection device provided by the embodiment of the present invention;

[0025] Figure 3 is Figure 2 the enlarged view at A in

[0026] Figure 4 is the sectional view of Embodiment 1 of the present invention;

[0027] Figure 5 is the sectional view of Embodiment 2 of the present invention;

[0028] Figure 6 is the sectional view at the clamping block of Embodiment 1 of the present invention;

[0029] Figure 7 is the sectional view at the clamping block of Embodiment 2 of the present invention;

[0030] Figure 8It is a cross-sectional view of the clamping block in Embodiment 3 of the present invention.

[0031] Explanation of reference numerals:

[0032] 10 - First component, 11 - Bending part;

[0033] 20 - Second component;

[0034] 30 - Locking part, 31 - Clamping block, 310 - Protrusion, 32 - Housing, 320 - First through hole, 321 - First opening part, 33 - Second elastic part;

[0035] 40 - Driving part, 41 - Pulling rope, 42 - Third component;

[0036] 50 - Pipe body;

[0037] 60 - Pushing rod, 61 - Friction layer, 62 - Card slot;

[0038] 70 - First elastic part, 71 - Third elastic part;

[0039] 80 - Cover body, 81 - Second through hole, 82 - Third through hole. Detailed implementation manners

[0040] The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] Existing large-dose injection devices include a pipe body 50 and a straight rod-shaped pushing rod 60. During injection, it is difficult to push forward with one hand due to the action of friction and pressure. Especially for the injection device used for nasogastric tube injection, because the liquid food to be injected has high viscosity, the injection device is very strenuous to inject. Moreover, in actual operation, it is often necessary to pinch the connection between the nasogastric tube and the injection device with the left hand and operate with the right hand alone. Long-term operation is extremely likely to cause hand fatigue and it is difficult to achieve efficient and stable pushing actions.

[0042] Embodiment 1

[0043] See Figure 1 -2, the present invention provides a nasogastric injection device and its injection method. A pinching part is arranged on the side of the pushing rod 60. A locking part 30 is arranged at the first end of the pinching part. The movable end of the locking part 30 is arranged on the pushing rod 60. The second end of the pinching part is connected to the pipe body 50. The first end and the second end of the pinching part both face the pushing rod 60. One end is connected to the pushing rod 60 through the locking part 30, and one end is connected to the pipe body 50. Therefore, by pinching the first end of the pinching part to approach the second end, force can be applied to the pushing rod 60, and the force directly applied to the axial direction of the pushing rod 60 is transferred to the lateral direction. This structure utilizes the lever principle, similar to scissors, and the operation is more labor-saving.

[0044] The locking member 30 has a first state and a second state. When the locking member 30 is in the first state, the locking member 30 is separated from the push rod 60. When the locking member 30 is in the second state, the locking member 30 is connected to the push rod 60. The purpose of the locking member 30 having two states is that when the locking member 30 is separated from the push rod 60, the push rod 60 can move freely, facilitating the suction of liquid or liquid food. When the locking member 30 is connected to the push rod 60, the locking member 30 can drive the push rod 60 to move.

[0045] It further includes a driving member 40 for driving the locking member 30 to switch between the first state and the second state.

[0046] When an external force is applied to the kneading member, the first end of the kneading member approaches the second end. At the same time, the driving member 40 drives the locking member 30 to switch from the first state to the second state, and the locking member 30 drives the push rod 60 to move towards the injection end of the tube body 50. Since the second end of the kneading member is connected to the tube body 50, when a force is applied to the kneading member, the first end of the kneading member can move towards the second end, so that the locking member 30 drives the push rod 60 to move, realizing the injection action.

[0047] In this embodiment, the kneading member includes a first component 10 and a second component 20. The first component 10 and the second component 20 are hinged, and a first elastic member 70 is provided at the hinge of the first component 10 and the second component 20. In this embodiment, the first component 10 and the second component 20 are S-shaped handles. It should be noted that the connection method between the second component 20 and the tube body 50 is a rotational connection. When the tails of the first component 10 and the second component 20 are pinched, the second component 20 can have a certain amount of movement relative to the tube body 50. They are hinged at the bent part of the first component 10 and the second component 20, and there is a preset angle between the first component 10 and the second component 20. The size of the preset angle can be adjusted according to different specifications of the injection device to achieve the most labor-saving state. The first elastic member 70 can be a torsion spring. The torsion spring can not only keep the first component 10 and the second component 20 at the preset angle, but also enable the first component 10 and the second component 20 to quickly reset when the applied force is cancelled.

[0048] In the embodiment provided by the present application, the first component 10 and the second component 20 increase the torque through the lever principle, which can not only be operated with one hand but also be more labor-saving. A certain balance can be maintained between the first component 10 and the second component 20. When a force is applied to the push rod 60, the push rod 60 can be prevented from shifting. By repeatedly pinching the first component 10 and the second component 20 in the present application, the push rod 60 can be stably driven to gradually move towards the injection end of the tube body 50, thereby ensuring the uniformity of the injection speed.

[0049] In addition, since the kneading element utilizes the lever principle, the kneading element may also include only the first component 10, the first component 10 is rotatably connected to the tube body 50, one end of the first component 10 is connected to the locking component 30, and the other end of the first component 10 is a movable end. By applying force to the movable end, a reaction force is applied to the end of the first component 10 connected to the locking component 30, so that the end moves downward. The kneading element may also be other structures that can realize the lever principle, which is not limited here.

[0050] In this embodiment, see Figure 3 and Figure 6 As shown, the locking member 30 includes a block 31, which is disposed on the push rod 60. When the locking member 30 is in the first state, there is a preset distance between the inner wall surface of the block 31 and the push rod 60. When the locking member 30 is in the second state, the inner wall surface of the block 31 on the side away from the driving member 40 abuts against the push rod 60. The block can be a U-shaped structure or a U-shaped structure, which is not limited here. In the first state, the block 31 does not contact the push rod 60, and the push rod 60 can move freely. The push rod 60 is pulled to absorb liquid food or liquid. When the block 31 abuts against the push rod 60, the friction between the two can drive the push rod 60 to descend.

[0051] In this embodiment, see Figure 3 As shown, a housing 32 is provided outside the locking member 30, one end of the housing 32 is rotatably connected to the first member 10, a first through hole 320 for the push rod 60 to pass through is provided on the housing 32, and a first opening 321 is provided on the side of the housing 32 facing the first member 10. In the embodiment provided in the present application, the first opening 321 is used for the driving member 40 to pass through the housing 32 and connect with the locking member 30. In addition, the housing 32 can protect the locking member 30 and prevent it from being exposed to the outside and damaged.

[0052] See also Figure 4 As shown in FIG. 8 , a second elastic member 33 is connected to the side of the locking member 30 that faces away from the driving member 40, and the other end of the second elastic member 33 is connected to the housing 32. The second elastic member 33 may be a spring. With the elastic reset function of the spring, after the operator completes a pinching operation, the spring and the driving member 40 cooperate, and the operator only needs to release the force on the first member 10 and the second member 20, and the spring can automatically reset the locking member 30, providing a stable reset force for the locking member 30.

[0053] In this embodiment, see Figure 1As shown, in order to ensure that when the first end of the kneading element approaches the second end, the locking element 30 can be locked with the push rod 60 first, the driving element 40 includes a pull rope 41 and a third component 42, the third component 42 is hinged to the end of the first component 10 away from the locking element 30, and a third elastic component 71 is provided at the hinge between the first component 10 and the third component 42. The connecting end of the first component 10 and the third component 42 is bent toward one side of the tube body 50 to form a bending portion 11, one end of the pull rope 41 is connected to the locking element 30, and the other end of the pull rope 41 is connected to the third component 42 via the first component 10. The third component 42 and the end of the second component 20 extend in the same direction, so the process of applying external force to the kneading member is: applying force to the third component 42 and the second component 20, thereby first driving the tension of the pull rope 41 to switch the locking member 30 from the first state to the second state, and then by continuing to apply force to the third component 42 and the second component 20, the applied force is transferred to the first component 10 and the second component 20. In this embodiment, the pull rope 41 can be arranged inside the first component 10, which not only reduces the exposed part, but also optimizes the spatial layout of the entire push injection device. This design enables the operator to use one hand to complete the state switching action and the pinching action of the locking member 30. In some scenarios where other operations need to be performed at the same time or other devices need to be held, this one-handed operation feature greatly improves work efficiency and operational convenience. The third elastic member 71 can be a torsion spring to facilitate the rapid reset of the first component 10 and the third component 42.

[0054] Furthermore, the elastic force of the third elastic member 71 and the second elastic member 33 is much smaller than that of the first elastic member 70. In this way, when the third component 42 and the second component 20 are squeezed, because the instantaneous speed is relatively fast, the third elastic member 71 and the second elastic member 33 will be deformed first, and the pull rope 41 will be straightened, thereby first driving the locking member 30 to switch from the first state to the second state. When the pull rope 41 is pulled to the limit, when force is applied to the third component 42 and the second component 20, the locking member 30 will drive the push rod 60 to move downward.

[0055] See also Figure 1 -2 and 5, in the present embodiment, the pull rope 41 passes through the bending portion 11 when connected to the third component 42. The bending portion 11 changes the direction of the pull rope 41, so that when the operator squeezes the third component 42, the force can be transmitted to the locking member 30 at a more reasonable angle, thereby increasing the support length. When the pull rope 41 is pulled, the length change is more obvious, and the response speed of the clamping block 31 is faster when it is clamped. In addition, the bending portion 11 can shorten the angle at which the third component 42 needs to rotate when the pull rope 41 reaches the limit state, so that when force is continued to be applied to the third component 42 and the second component 20, the push rod 60 can be lowered a greater distance to quickly complete the injection.

[0056] In this embodiment, see Figure 3As shown, a cover body 80 is provided on the tube body 50. The second component 20 is rotatably connected to the cover body 80. A second through hole 81 for the push rod 60 to penetrate is formed on the cover body 80, and a third through hole 82 is also formed on the cover body 80. The third through hole 82 is used for exhausting air. In the embodiment provided in the present application, when the cover body 80 is provided, when the tube body 50 is separated from the push rod 60, the first component 10 and the second component 20 can be removed together with the push rod 60. When injecting liquid food, the injection device can be reused. This separated structure is convenient for cleaning and disinfection. Of course, the second component 20 can also be directly rotatably connected to the outer wall of the tube body 50, preferably the outer wall near the push handle end.

[0057] Embodiment 2

[0058] Participate Figure 7 As shown, this embodiment provides a nasal feeding injection device, which is different from Embodiment 1 in that: a plurality of card slots 62 are formed on the side of the push rod 60 facing away from the first component 10, and a protrusion 310 is provided on the side of the clamping block 31 facing the card slots 62. When the locking member 30 is in the second state, the protrusion 310 abuts against the card slots 62. The cooperation between the protrusion 310 and the card slots 62 can increase the stability of the locking member 30 in the locked state. When the protrusion 310 tightly abuts against the card slots 62, it will be clamped to prevent the locking member 30 and the push rod 60 from moving, ensuring that the push rod 60 can maintain a fixed position after being locked, so as to more accurately control the injection volume of the injection device. And when the protrusion 310 abuts against the card slots 62, obvious tactile and sound feedback will be generated. The operator can intuitively understand that the locking member 30 has reached the preset position and the push rod 60 has been successfully locked through this feedback. The advantage of the card slots 62 is that it is not easy to slide after being inserted.

[0059] Embodiment 3

[0060] Refer to Figure 8 As shown, this embodiment provides a nasal feeding injection device, which is different from Embodiment 1 in that: friction layers 61 are provided on the outer wall surface of the push rod 60 and the inner wall surface of the clamping block 31. The friction layer 61 can roughen the surfaces of the push rod 60 and the clamping block 31, or set friction surfaces, the purpose is to increase the friction between the two. The friction layer 61 can be provided on the surface where the push rod 60 and the clamping block 31 abut when locked, or friction layers 61 can be provided on both opposite surfaces of the two, which is not limited here. The advantage of the friction layer 61 is that it can be clamped at any position in the length direction of the push rod 60 to achieve stepless clamping without a sense of jerk.

[0061] The injection method of the present invention uses the above-mentioned nasal feeding injection device for injection, including the following steps:

[0062] After the tube body 50 is filled with liquid food or liquid, a force is applied to the kneading member, and the first end of the kneading member approaches the second end. During this process, the driving member 40 drives the locking member 30 to switch from the first state to the second state;

[0063] When the locking member 30 is in the second state, the locking member 30 locks with the push rod 60. Continuing to apply a force to the kneading member, the locking member 30 drives the push rod 60 to move towards the injection end of the tube body 50;

[0064] When the force application is cancelled, the locking member 30 switches from the second state to the first state, the locking member 30 unlocks from the push rod 60, and the kneading member resets. Repeat the above steps until the liquid food or liquid in the tube body is completely injected.

[0065] This injection method uses the lever principle to extend the force arm to the side of the push rod 60. Compared with applying a force to the top of the push rod 60, this method can be operated with one hand. The driving member drives the locking member to first lock the push rod, and the second component 20 is connected to the tube body 50. Therefore, the first component 10 and the second component 20 can approach each other repeatedly to achieve the gradual descent of the push rod 60, making the pushing process more labor-saving and stable.

[0066] This application will be described in detail by taking Embodiment 2 as an example:

[0067] When pinching the ends of the third component 42 and the second component 20, because the instantaneous speed is relatively fast, the pull rope 41 is tensioned, and the third elastic member 71 and the second elastic member 33 will deform first. The protrusion 310 snaps into the card slot 62. In Embodiment 1 and Embodiment 3, the latch 31 abuts against the push rod 60 or the friction layer 61 on the push rod 60 respectively, and the two are locked by friction. As long as the pinching force does not relax, it is sufficient to ensure the stable locking state of the latch 31 and the push rod 60;

[0068] Until the latch 31 abuts tightly and cannot move, and at the same time the pull rope is completely straightened, continuing to pinch the third component 42 can drive the first component 10 to close towards the second component 20, thereby driving the push rod 60 to move downward to inject the liquid food, which ensures that the push rod 60 is first clamped and then driven to move downward to avoid sliding;

[0069] After releasing the third component 42 and the second component 20, each component resets. Repeat the above steps. Each time, inject a certain distance to meet the requirements of labor-saving and one-handed operation. And in the natural state, it is very convenient to pull out the push rod 60 outward without resistance.

[0070] When the viscosity of the liquid food is greater, a greater pinching force is required. At this time, the force between the third component 42 and the second component 20 is relatively large. In this way, the pulling force required for the pull rope 41 is also greater, and the frictional force on the friction layer 61 or the clamping force on the card slot 62 is also greater. The two increase proportionally, thus avoiding sliding. That is, the force of the injection push rod 60 can be converted into the clamping force on the clamping block 31 or the frictional force on the friction layer 61, and the fixing effect is better.

[0071] The structure, features and effects of the present invention have been described in detail based on the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, which still do not exceed the spirit covered by the specification and the drawings, should be within the protection scope of the present invention.

Claims

1. A nasogastric bolus injection device, comprising a tube body and a push rod, characterized in that, A kneading piece is arranged on the side of the push rod, a locking piece is arranged on the first end of the kneading piece, a movable end of the locking piece is arranged on the push rod, and a second end of the kneading piece is connected to the tube body, wherein: The locking member has a first state and a second state. When the locking member is in the first state, the locking member is separated from the push rod. When the locking member is in the second state, the locking member is connected to the push rod. Also includes a driving member for driving the locking member to switch between the first state and the second state; When an external force is applied to the kneading member, the first end of the kneading member approaches the second end, and at the same time, the driving member drives the locking member to switch from the first state to the second state, and the locking member drives the push rod to move toward the injection end of the tube body.

2. The nasogastric bolus injection device according to claim 1, wherein: The kneading element comprises a first component and a second component, the first component is hinged to the second component, and a first elastic component is provided at the hinged position between the first component and the second component.

3. The nasal feeding bolus device according to claim 1, characterized in that The locking member includes a card block, which is arranged on the push rod. When the locking member is in a first state, there is a preset distance between the inner wall surface of the card block and the push rod. When the locking member is in a second state, the inner wall surface of the card block facing away from the driving member abuts against the push rod.

4. The nasal feeding bolus injection device according to claim 3, characterized in that, A plurality of slots are provided on a side of the push rod facing away from the kneading member, and a protrusion is provided on a side of the block facing the slots. When the locking member is in the second state, the protrusion is pressed into the slot.

5. The nasogastric bolus injection device according to claim 3, characterized in that, The outer wall surface of the push rod and the inner wall surface of the clamping block are both provided with a friction layer.

6. The nasal feeding bolus device according to claim 2, characterized in that A shell is disposed outside the locking member, the shell is rotatably connected to the first component, a first through hole for the push rod to pass through is provided on the shell, and a first opening is provided on a side of the shell facing the first component.

7. The nasal feeding bolus injection device according to claim 6, wherein A second elastic member is connected to a side of the locking member facing away from the driving member, and the other end of the second elastic member is connected to the housing.

8. The nasal feeding bolus injection device according to claim 2, wherein The driving member includes a pull rope and a third component, the third component is hinged to one end of the first component facing away from the locking component, a third elastic component is provided at the hinge between the first component and the third component, the connecting end of the first component and the third component is bent toward one side of the tube body to form a bending portion, one end of the pull rope is connected to the locking component, and the other end of the pull rope is connected to the second component via the bending portion.

9. The nasal feeding bolus device according to claim 2, wherein, The tube body is provided with a cover body, the second component is rotatably connected to the cover body, the cover body is provided with a second through hole for the push rod to pass through, and the cover body is also provided with a third through hole.

10. A bolus injection method, characterized in that, The nasogastric feeding push injection device according to any one of claims 1 to 9 is used for push injection, comprising the following steps: When the tube is filled with liquid food or liquid, force is applied to the kneading element, and the first end of the kneading element approaches the second end. During this process, the driving element drives the locking element to switch from the first state to the second state. When the locking member is in the second state, the locking member is locked with the push rod, and the kneading member continues to be forced, and the locking member drives the push rod to move toward the injection end of the tube body; The force application is cancelled, the locking member switches from the second state to the first state, the locking member unlocks from the push rod, and the kneading member resets. Repeat the above steps until the liquid food or liquid in the tube body is completely injected.

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