Quantitative injection needle cylinder

Abstract

The quantitative injection needle cylinder comprises a cylinder body and a push rod, a needle head is arranged at the front end of the cylinder body, a piston is arranged at the front end of the push rod, and the piston is tightly attached to the inner wall of the cylinder body; the device further comprises a sliding limiting piece and a quantifying assembly, the sliding limiting piece is used for limiting rotation of the push rod when the push rod slides in the axis direction of the barrel, the push rod and the barrel are coaxially arranged, multiple sets of limiting grooves are formed in the outer wall of the push rod and distributed in the circumferential direction of the barrel, and each set of limiting grooves comprises a plurality of limiting grooves; the multiple limiting grooves are distributed in the axis direction of the push rod, the distances between every two adjacent limiting grooves in the same set are the same, and the distances between every two adjacent limiting grooves in different sets are different. An arc-shaped through groove is formed in the rear end of the cylinder body in the circumferential direction of the cylinder body, the arc-shaped through groove right faces the multiple sets of limiting grooves, and the quantitative assembly is movably arranged in the arc-shaped through groove, is used for being matched with the multiple sets of limiting grooves and sequentially acts on the multiple limiting grooves of the corresponding sets to limit sliding of the push rod at intervals. Therefore, the injection amount can be conveniently controlled by operators.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a quantitative injection syringe barrel. Background Art

[0002] When dispensing medicine or injecting clinically, it often occurs that the liquid medicine in the syringe barrel needs to be injected in portions. For existing syringes, the operator needs to control the injection volume according to the scale on the syringe barrel. The operator needs to constantly pay attention to the scale and control the injection volume. If the mind is not concentrated or the force is not well controlled, it is very easy to have a situation where the injection volume is too large or too small. Summary of the Invention

[0003] In order to facilitate the operator to control the injection volume, the present application provides a quantitative injection syringe barrel.

[0004] The quantitative injection syringe barrel provided by the present application adopts the following technical solutions: A quantitative injection syringe barrel includes a barrel body and a push rod. A needle head is provided at the front end of the barrel body, a first flange is provided at the rear end of the barrel body, a piston is provided at the front end of the push rod, the piston moves in the barrel body and is closely attached to the inner wall of the barrel body, and a second flange is provided at the rear end of the push rod; It further includes a sliding limiting member and a quantitative component. The sliding limiting member is used to limit the rotation of the push rod when sliding along the axis of the barrel body. The push rod is coaxially arranged with the barrel body. A plurality of groups of limiting grooves are formed on the outer wall of the push rod. The plurality of groups of limiting grooves are distributed along the circumferential direction of the barrel body. Each group of limiting grooves includes a plurality of limiting grooves. The plurality of limiting grooves are distributed along the axial direction of the push rod. The distance between two adjacent limiting grooves in the same group is the same, and the distance between two adjacent limiting grooves in different groups is different; An arc-shaped through groove is formed on the rear end of the barrel body along the circumferential direction of the barrel body. The arc-shaped through groove faces a plurality of groups of limiting grooves. The quantitative component is movably arranged in the arc-shaped through groove. The quantitative component is used to cooperate with the plurality of groups of limiting grooves to intermittently limit the sliding of the push rod by acting on a plurality of limiting grooves in the corresponding group in sequence.

[0005] By adopting the above technical solutions, the distance between two adjacent limiting grooves in the same group is the same. The same distance that the push rod and the piston move represents a constant injection volume. The injection volume is controlled by setting an appropriate interval distance. The quantitative component cooperates with the limiting grooves to intermittently limit the sliding of the push rod, thereby facilitating the operator to control the injection volume.

[0006] Preferably, the metering component includes a disengaging member, a limiting member, a moving block, an inserting block and a first spring. The moving block is slidably connected to the arc-shaped through groove along the radian of the arc-shaped through groove. The limiting member is used to limit the position of the moving block in the arc-shaped through groove. A first groove is formed on one side of the moving block facing the push rod. The inserting block is slidably connected to the first groove in the radial direction of the cylinder body. The first spring is arranged in the first groove. Two ends of the first spring are respectively fixedly arranged on the bottom wall of the first groove and the inserting block. The first spring is used to drive the inserting block to move towards the push rod. One end of the inserting block facing the push rod is tapered, and its front and back surfaces are both inclined. The limiting groove is completely matched with the tapered end of the inserting block; The disengaging member is used to drive the inserting block to always disengage from the limiting groove.

[0007] By adopting the above technical solution, when pumping liquid or injecting an indefinite amount of liquid medicine, at this time, the piston needs to be able to move freely without restriction. The disengaging member can drive the inserting block to always disengage from the limiting groove, and the inserting block does not act on the push rod, so that the piston and the push rod can move freely; when quantitative injection is required, the user moves the moving block to face the corresponding limiting groove in the corresponding row, and then every time a quantitative amount of liquid medicine is injected, the inserting block will enter the corresponding limiting groove under the action of the first spring. The operator can control the force applied to the push rod by feeling the cooperation between the limiting groove and the inserting block to achieve quantitative injection. The end of the inserting block is tapered to drive the inserting block out of the limiting groove when the push rod applies force.

[0008] Preferably, the limiting member includes a clamping block and a plurality of clamping grooves. The plurality of clamping grooves respectively correspond to multiple groups of limiting grooves. The plurality of clamping grooves are sequentially formed on one side wall of the arc-shaped through groove along the radian of the arc-shaped through groove. The clamping block is fixedly arranged on one side surface of the moving block facing the clamping groove. The clamping block is in clamping fit with the clamping groove. When the clamping block is clamped in the corresponding clamping groove, the inserting block faces the corresponding group of limiting grooves.

[0009] By adopting the above technical solution, through the cooperation between the clamping block and the clamping groove, the moving block can be relatively fixed in the arc-shaped through groove.

[0010] Preferably, it further includes a trigger rod, a second spring, a control component, a fixed block, an elastic block and a movable block. The cross section of the trigger rod is T-shaped. A first sliding groove is formed on the rear end surface of the push rod along the axial direction. The trigger rod is slidably connected in the first sliding groove. The second spring is arranged in the first sliding groove and is used to drive the rear end of the trigger rod to always protrude from the rear end of the push rod without external force; A cavity is formed inside the inserted block. A groove is formed on the inner wall of the first slot, and a through groove is formed on the inner wall of the inserted block. When the inserted block completely enters the limiting slot, the groove is aligned with the through groove. The fixed block is fixedly arranged in the cavity and faces the through groove. The movable block is slidably connected to the through groove. The elastic block is arranged between the fixed block and the movable block and is used to drive the end of the movable block into the groove when the groove is aligned with the through groove. When and only when the inserted block completely enters the limiting slot, the control component is used to drive the movable block out of the groove every time the trigger rod is triggered.

[0011] By adopting the above technical solution, in the cooperation between the inserted block and the limiting slot, the user still needs to pay attention to the force application. If the force is always too large, the push rod will still be driven to move forward all the time. Therefore, when the inserted block completely enters the limiting slot, the groove is aligned with the through groove, and the movable block can automatically insert into the groove under the action of the elastic block, so as to lock the position of the inserted block. The inserted block cannot move in the moving block. At this time, even if the user applies a large force, it is difficult to push the push rod. Only when the trigger rod is pressed again to trigger the trigger rod, the control component will drive the inserted block to move away from the groove. At this time, continuing to apply force can push the push rod to move forward until the inserted block enters the next limiting slot, and the above steps are repeated.

[0012] Preferably, the control component includes a first pulling rope, a rotating shaft and a protrusion. The rotating shaft is rotatably arranged at one end of the inserted block close to the push rod. A part of the rotating shaft protrudes from the end of the inserted block. The rotation axis of the rotating shaft is parallel to the radial direction of the push rod. A receiving groove for receiving the rotating shaft is formed on the inner wall of the limiting slot, and the first chute communicates with a plurality of receiving grooves. When the inserted block completely enters the limiting slot, the rotating shaft abuts against the side wall of the trigger rod, and the elastic force of the second spring is less than the friction force between the piston and the inner wall of the cylinder. The protrusion is fixedly arranged on the rotating shaft. One end of the first pulling rope is fixedly arranged on the movable block, and the other end of the first pulling rope passes through the elastic block and the fixed block in sequence and is fixedly arranged on the protrusion.

[0013] By adopting the above technical solution, when the user presses the trigger rod, the trigger rod first drives the rotating shaft to rotate. The rotating shaft drives the protrusion to pull the first pulling rope, and the first pulling rope overcomes the elastic force of the elastic block to pull the movable block out of the groove, so as to realize unlocking. When the trigger rod is pressed to the extreme position horizontal with the second flange, the push rod moves, and under the action of the inclined surface, the inserted block is driven out of the corresponding limiting slot.

[0014] Preferably, the separating member includes a second drawstring, a pull ring, and a fixing post. There is a knot on the second drawstring. A first opening communicating with the inner cavity and the first groove is formed on the plug block. A second opening is formed through the first groove toward the needle head side. One end of the second drawstring is fixedly arranged on the movable block. The other end of the second drawstring sequentially passes through the elastic block, the fixing block, the first opening, and the second opening and extends out, and is fixed on the pull ring. The knot is located in the inner cavity and cannot pass through the first opening. When the knot abuts against the side wall of the inner cavity near the first opening, the movable block disengages from the groove. The fixing post is fixedly arranged on the outer wall of the barrel. The fixing post is arranged in a columnar cone shape. The fixing post is for the pull ring to hook. When the pull ring is hung on the fixing post, the plug block disengages from the limiting groove.

[0015] By adopting the above technical solution, when it is necessary for the plug block to maintain a state of being separated from the limiting groove for a long time, the operator pulls the pull ring. The pull ring first drives the movable block to disengage from the groove, and then the knot abuts near the first opening, driving the plug block out of the limiting groove.

[0016] Preferably, the sliding limiting member includes a second sliding groove and a first block. The first block is fixedly arranged on the inner wall of the syringe barrel. The second sliding groove is formed on the side wall of the push rod along the axial direction of the syringe barrel. The end of the first block is slidably connected with the second sliding groove.

[0017] The technical effects of the present invention are mainly reflected in the following aspects: 1. The quantitative component of the present invention cooperates with the limiting groove to intermittently limit the sliding of the push rod, thereby facilitating the operator to control the injection volume. 2. In the cooperation between the plug block and the limiting groove of the present invention, the user still needs to pay attention to the applied force. If the applied force is always too large, the push rod will still be driven to move forward all the time. Therefore, when the plug block completely enters the limiting groove, the groove is aligned with the through groove, and the movable block can automatically insert into the groove under the action of the elastic block, thereby locking the position of the plug block. The plug block cannot move in the movable block. At this time, even if the user applies a large force, it is difficult to push the push rod. Only when the trigger rod is pressed again to trigger the trigger rod, the control component will drive the plug block to move away from the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural schematic diagram of the embodiment of the present application.

[0019] Figure 2 is the overall structural schematic diagram of another angle of the embodiment of the present application.

[0020] Figure 3 is the structural schematic diagram of the push rod of the embodiment of the present application.

[0021] Figure 4 is Figure 2Partial sectional view along line A-A

[0022] Figure 5 is Figure 4 Enlarged view at B in

[0023] Description of reference numerals: 1, barrel; 11, needle; 12, first flange; 13, arc-shaped through groove; 2, push rod; 21, piston; 22, second flange; 23, limiting groove; 231, receiving groove; 24, first sliding groove; 3, sliding limiting member; 31, second sliding groove; 32, first block; 4, limiting member; 41, clamping block; 42, clamping groove; 51, moving block; 511, first groove; 512, groove; 52, inserting block; 521, chamber; 522, through groove; 53, first spring; 61, trigger rod; 62, second spring; 63, fixed block; 64, elastic block; 65, movable block; 7, control assembly; 71, first pull rope; 72, rotating shaft; 73, protrusion; 8, disengaging member; 81, second pull rope; 811, knot; 82, pull ring; 83, fixed column; 84, first opening; 85, second opening. Detailed implementation manners

[0024] The following combines the attached Figures 1 - 5 to further elaborate on the present application, so that the technical solutions of the present application are easier to understand and master.

[0025] The embodiment of the present application discloses a quantitative injection syringe.

[0026] Referring to Figures 1 - 3 , a quantitative injection syringe of this embodiment includes a barrel 1 and a push rod 2. A needle 11 is provided at the front end of the barrel 1, a first flange 12 is provided at the rear end of the barrel 1, a piston 21 is provided at the front end of the push rod 2, the piston 21 moves in the barrel 1 and is in close contact with the inner wall of the barrel 1, and a second flange 22 is provided at the rear end of the push rod 2.

[0027] Referring to Figures 1 - 3 , it further includes a sliding limiting member 3 and a quantitative component. The sliding limiting member 3 is used to limit the rotation of the push rod 2 when sliding along the axial direction of the barrel 1. The push rod 2 and the barrel 1 are coaxially arranged. A plurality of groups of limiting grooves 23 are provided on the outer wall of the push rod 2. The plurality of groups of limiting grooves 23 are distributed along the circumferential direction of the barrel 1. Each group of limiting grooves 23 includes a plurality of limiting grooves 23. The plurality of limiting grooves 23 are distributed along the axial direction of the push rod 2. The distance between two adjacent limiting grooves 23 in the same group is the same, and the distance between two adjacent limiting grooves 23 in different groups is different.

[0028] Referring to Figures 1 - 3The rear end of the cylinder 1 is provided with an arc-shaped through groove 52213 along the circumference of the cylinder 1, and the arc-shaped through groove 52213 is directly opposite to a plurality of groups of limit grooves 23. The quantitative component is movably arranged in the arc-shaped through groove 52213, and the quantitative component is used to cooperate with the plurality of groups of limit grooves 23, and sequentially acts on the corresponding groups of limit grooves 23 to limit the sliding of the push rod 2. The outer side of the cylinder 1 is provided with a scale, and the scale is located on the side of the cylinder 1 away from the arc-shaped through groove 52213.

[0029] Reference Figures 1 - 3 The sliding limiting member 3 includes a second sliding groove 31 and a first block 32. The first block 32 is fixedly arranged on the inner wall of the syringe. The second sliding groove 31 is opened on the side wall of the push rod 2 along the axial direction of the syringe. The end of the first block 32 is slidably connected to the second sliding groove 31.

[0030] Reference Figures 1 - 3 The distance between two adjacent limiting grooves 23 in the same group of limiting grooves 23 is the same, and the push rod 2 and the piston 21 move the same distance, which means that the injection volume is constant. The injection volume is controlled by setting a suitable interval distance. The quantitative component cooperates with the limiting grooves 23 to limit the sliding of the push rod 2 at intervals, thereby facilitating the operator to control the injection volume.

[0031] Reference Figures 2 - 5 The quantitative assembly includes a disengagement member 8, a limit member 4, a moving block 51, an insert block 52 and a first spring 53. The moving block 51 is slidably connected to the arcuate through groove 52213 along the curvature of the arcuate through groove 52213. The limit member 4 is used to limit the position of the moving block 51 in the arcuate through groove 52213. The moving block 51 is provided with a first groove 511 on the side facing the push rod 2. The insert block 52 is slidably connected in the first groove 511 along the radial direction of the cylinder 1. The first spring 53 is arranged in the first groove 511. The two ends of the first spring 53 are respectively fixed on the bottom wall of the first groove 511 and on the insert block 52. The first spring 53 is used to drive the insert block 52 to move toward the side of the push rod 2. The end of the insert block 52 facing the push rod 2 is tapered, and its front and rear surfaces are both inclined. The limiting groove 23 is completely matched with the tapered end of the insert block 52.

[0032] Reference Figures 2 - 5 The disengagement member 8 is used to drive the insert block 52 to always disengage from the limiting groove 23 .

[0033] Reference Figures 2 - 5, when pumping liquid or injecting an indefinite amount of liquid medicine, the piston 21 needs to be able to move freely without restriction at this time. The disengaging member 8 can drive the insertion block 52 to always disengage from the limiting groove 23, and the insertion block 52 does not act on the push rod 2. The piston 21 and the push rod 2 can move freely; when quantitative injection is required, the user moves the moving block 51 to be opposite to the corresponding row of limiting grooves 23, and then for each injection of a quantitative amount of liquid medicine, the insertion block 52 will enter the corresponding limiting groove 23 under the action of the first spring 53. The operator can control the force applied to the push rod 2 by feeling the cooperation between the limiting groove 23 and the insertion block 52 to achieve quantitative injection. The end of the insertion block 52 is tapered to drive the insertion block 52 out of the limiting groove 23 when the push rod 2 applies force.

[0034] Referring to Figure 2 and Figure 5 , the limiting member 4 includes a clamping block 41 and a plurality of clamping grooves 42. The plurality of clamping grooves 42 respectively correspond to multiple groups of limiting grooves 23. The plurality of clamping grooves 42 are sequentially opened on one side wall of the arc-shaped through groove 52213 along the radian of the arc-shaped through groove 52213. The clamping block 41 is fixedly arranged on the side surface of the moving block 51 facing the clamping groove 42. The clamping block 41 is in the shape of an arched column, and the clamping block 41 is in clamping fit with the clamping groove 42. When the clamping block 41 is clamped in the corresponding clamping groove 42, the insertion block 52 is opposite to the corresponding group of limiting grooves 23. When the moving block 51 moves to align with the outermost corresponding group of limiting grooves 23, the moving block 51 abuts against the end wall of the arc-shaped through groove 52213 at the same time.

[0035] Referring to Figure 2 and Figure 5 , through the cooperation between the clamping block 41 and the clamping groove 42, the moving block 51 can be relatively fixed in the arc-shaped through groove 52213.

[0036] Referring to Figures 2 - 5 , it further includes a trigger rod 61, a second spring 62, a control assembly 7, a fixed block 63, an elastic block 64 and a movable block 65. The cross-section of the trigger rod 61 is arranged in a T shape. A first sliding groove 24 is axially opened on the rear end surface of the push rod 2. The trigger rod 61 is slidably connected in the first sliding groove 24. The second spring 62 is arranged in the first sliding groove 24 and is used to drive the rear end of the trigger rod 61 to always protrude from the rear end of the push rod 2 without external force.

[0037] Referring to Figures 2 - 5, a chamber 521 is formed inside the insertion block 52, a groove 512 is formed on the inner wall of the first slot 511, and a through slot 522 is formed on the inner wall of the insertion block 52. When the insertion block 52 completely enters the limit slot 23, the groove 512 is aligned with the through slot 522; the fixed block 63 is fixedly arranged in the chamber 521, the fixed block 63 is aligned with the through slot 522, the movable block 65 is slidably connected to the through slot 522, and the elastic block 64 is arranged between the fixed block 63 and the movable block 65 for driving the end of the movable block 65 to enter the groove 512 when the groove 512 is aligned with the through slot 522.

[0038] Refer to Figures 2 - 5 , when and only when the insertion block 52 completely enters the limit slot 23, the control component 7 is used to drive the movable block 65 to disengage from the groove 512 every time the trigger rod 61 is triggered.

[0039] Refer to Figures 2 - 5 , in the cooperation between the insertion block 52 and the limit slot 23, the user still needs to pay attention to the applied force. If the applied force is always too large, the push rod 2 will still be driven to move forward all the time; so when the insertion block 52 completely enters the limit slot 23, the groove 512 is aligned with the through slot 522, and the movable block 65 can automatically insert into the groove 512 under the action of the elastic block 64, thereby locking the position of the insertion block 52. The insertion block 52 cannot move within the moving block 51. At this time, even if the user applies a large force, it is difficult to push the push rod 2. Only when the trigger rod 61 is pressed again to trigger the trigger rod 61, the control component 7 will drive the insertion block 52 to move away from the groove 512. At this time, continuing to apply force can push the push rod 2 to move forward until the insertion block 52 enters the next limit slot 23, and the above steps are repeated.

[0040] Refer to Figures 2 - 5 , the control component 7 includes a first pull rope 71, a rotating shaft 72 and a protrusion 73. The rotating shaft 72 is rotatably arranged at one end of the insertion block 52 close to the push rod 2. A part of the rotating shaft 72 protrudes from the end of the insertion block 52. The rotation axis of the rotating shaft 72 is parallel to the radial direction of the push rod 2. A receiving groove 231 for receiving the rotating shaft 72 is formed on the inner wall of the limit slot 23, and the first chute 24 communicates with a plurality of receiving grooves 231; when the insertion block 52 completely enters the limit slot 23, the rotating shaft 72 abuts against the side wall of the trigger rod 61, and the elastic force of the second spring 62 is less than the frictional force between the piston 21 and the inner wall of the cylinder 1.

[0041] Refer to Figures 2 - 5 , the protrusion 73 is fixedly arranged on the rotating shaft 72. One end of the first pull rope 71 is fixedly arranged on the movable block 65, and the other end of the first pull rope 71 passes through the elastic block 64 and the fixed block 63 in sequence and is fixedly arranged on the protrusion 73.

[0042] Refer to Figures 2 - 5When the user presses the trigger lever 61, the trigger lever 61 first drives the rotation of the rotating shaft 72. The rotating shaft 72 drives the protrusion 73 to pull the first pulling rope 71. The first pulling rope 71 overcomes the elastic force of the elastic block 64 to pull the movable block 65 out of the groove 512, thereby realizing unlocking. After the trigger lever 61 is pressed to the extreme position horizontal with the second flange 22, the push rod 2 moves, and under the action of the inclined surface, the insertion block 52 is driven out of the corresponding limiting groove 23.

[0043] Refer to Figures 2 - 5 The disengaging member 8 includes a second pulling rope 81, a pull ring 82 and a fixing column 83. There is a knot 811 on the second pulling rope 81. The insertion block 52 is provided with a first opening 84 communicating with the inner cavity and the first groove 511. The first groove 511 is provided with a second opening 85 penetrating toward the needle 11. One end of the second pulling rope 81 is fixedly arranged on the movable block 65, and the other end of the second pulling rope 81 sequentially passes through the elastic block 64, the fixing block 63, the first opening 84 and the second opening 85 and extends out, and is fixed on the pull ring 82; the knot 811 is located in the inner cavity, and the knot 811 cannot pass through the first opening 84. When the knot 811 abuts against the side wall of the inner cavity near the first opening 84, the movable block 65 disengages from the groove 512.

[0044] Refer to Figures 2 - 5 The fixing column 83 is fixedly arranged on the outer wall of the cylinder body 1. The fixing column 83 is arranged in a columnar cone shape. The fixing column 83 is for the pull ring 82 to be hooked. When the pull ring 82 is hung on the fixing column 83, the insertion block 52 disengages from the limiting groove 23.

[0045] Refer to Figures 2 - 5 When it is necessary to keep the insertion block 52 disengaged from the limiting groove 23 for a long time, the operator pulls the pull ring 82. The pull ring 82 first drives the movable block 65 to disengage from the groove 512, and then the knot 811 abuts near the first opening 84, driving the insertion block 52 out of the limiting groove 23.

[0046] Of course, the above are only typical examples of the present application. In addition, the present application can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A quantitative injection syringe, characterized in that: It comprises a cylinder (1) and a push rod (2), wherein the front end of the cylinder (1) is provided with a needle (11), the rear end of the cylinder (1) is provided with a first flange (12), the front end of the push rod (2) is provided with a piston (21), the piston (21) moves in the cylinder (1) and is tightly attached to the inner wall of the cylinder (1), and the rear end of the push rod (2) is provided with a second flange (22); It also comprises a sliding restriction member (3) and a quantitative assembly, wherein the sliding restriction member (3) is used to restrict the rotation of the push rod (2) when sliding along the axial direction of the cylinder (1), the push rod (2) is coaxially arranged with the cylinder (1), a plurality of groups of limiting grooves (23) are arranged on the outer wall of the push rod (2), the plurality of groups of limiting grooves (23) are distributed along the circumference of the cylinder (1), each group of limiting grooves (23) comprises a plurality of limiting grooves (23), the plurality of limiting grooves (23) are distributed along the axial direction of the push rod (2), the distance between two adjacent limiting grooves (23) in the same group is the same, and the distance between two adjacent limiting grooves (23) in different groups is different; The rear end of the cylinder (1) is provided with an arcuate through groove (522) (13) along the circumference of the cylinder (1), and the arcuate through groove (522) (13) is directly opposite to a plurality of groups of limit grooves (23). The quantitative component is movably arranged in the arcuate through groove (522) (13), and the quantitative component is used to cooperate with the plurality of groups of limit grooves (23) to sequentially act on the plurality of limit grooves (23) of the corresponding groups to limit the sliding of the push rod (2) at intervals.

2. A quantitative injection syringe according to claim 1, characterized in that: The quantitative assembly comprises a disengagement member (8), a stopper (4), a moving block (51), an insert block (52) and a first spring (53); the moving block (51) is slidably connected to the arcuate through groove (522) (13) along the arcuate through groove (522) (13); the stopper (4) is used to limit the position of the moving block (51) in the arcuate through groove (522) (13); the moving block (51) is provided with a first groove (511) on a side facing the push rod (2); the insert block (52) is radially extended along the cylinder (1) The first spring (53) is connected to the first groove (511) in a sliding direction, and the first spring (53) is arranged in the first groove (511). The two ends of the first spring (53) are respectively fixedly arranged on the bottom wall of the first groove (511) and the insert block (52). The first spring (53) is used to drive the insert block (52) to move toward the side of the push rod (2). The end of the insert block (52) facing the push rod (2) is tapered, and the front and rear surfaces thereof are both inclined. The limit groove (23) is completely matched with the tapered end of the insert block (52); The disengagement member (8) is used to drive the insert block (52) to always disengage from the limiting groove (23).

3. A quantitative injection syringe according to claim 2, characterized in that: The limiting member (4) comprises a clamping block (41) and a plurality of clamping slots (42), wherein the plurality of clamping slots (42) respectively correspond to a plurality of groups of limiting slots (23), and the plurality of clamping slots (42) are sequentially arranged on a side wall of the arc-shaped through slot (522) (13) along the curvature of the arc-shaped through slot (522) (13), wherein the clamping block (41) is fixedly arranged on a side surface of the moving block (51) facing the clamping slot (42), and the clamping block (41) is clamped and matched with the clamping slot (42), and when the clamping block (41) is clamped in the corresponding clamping slot (42), the inserting block (52) faces the corresponding group of limiting slots (23).

4. A quantitative injection syringe according to claim 2, characterized in that: It also includes a trigger rod (61), a second spring (62), a control assembly (7), a fixed block (63), an elastic block (64) and a movable block (65); the cross section of the trigger rod (61) is T-shaped; a first slide groove (24) is provided on the rear end surface of the push rod (2) along the axial direction; the trigger rod (61) is slidably connected in the first slide groove (24); the second spring (62) is arranged in the first slide groove (24) and is used to drive the rear end of the trigger rod (61) to always protrude from the rear end of the push rod (2) in the absence of external force; The insert block (52) is provided with a chamber (521) inside, the first slot (511) is provided with a groove (512) on the inner wall, and the insert block (52) is provided with a through groove (522) on the inner wall. When the insert block (52) completely enters the limiting slot (23), the groove (512) faces the through groove (522). The fixed block (63) is fixedly arranged in the chamber (521), the fixed block (63) faces the through groove (522), the movable block (65) is slidably connected to the through groove (522), and the elastic block (64) is arranged between the fixed block (63) and the movable block (65) and is used for driving the end of the movable block (65) to enter the groove (512) when the groove (512) faces the through groove (522). When and only when the insert block (52) completely enters the limiting groove (23), the control component (7) is used to drive the movable block (65) to disengage from the groove (512) each time the trigger rod (61) is triggered.

5. A quantitative injection syringe according to claim 1, characterized in that: The control assembly (7) comprises a first pull rope (71), a rotating shaft (72) and a protrusion (73); the rotating shaft (72) is rotatably arranged on one end of the plug block (52) close to the push rod (2); the rotating shaft (72) partially protrudes from the end of the plug block (52); the rotating axis of the rotating shaft (72) is parallel to the radial direction of the push rod (2); an accommodating groove (231) for accommodating the rotating shaft (72) is provided on the inner wall of the limiting groove (23); the first sliding groove (24) is connected to a plurality of accommodating grooves (231); when the plug block (52) completely enters the limiting groove (23), the rotating shaft (72) is pressed against the side wall of the trigger rod (61); the elastic force of the second spring (62) is smaller than the friction force between the piston (21) and the inner wall of the cylinder (1); The protrusion (73) is fixedly arranged on the rotating shaft (72), one end of the first pull rope (71) is fixedly arranged on the movable block (65), and the other end of the first pull rope (71) passes through the elastic block (64) and the fixed block (63) in sequence and is then fixedly arranged on the protrusion (73).

6. A quantitative injection syringe according to claim 4, characterized in that: The disengagement member (8) comprises a second pull rope (81), a pull ring (82) and a fixed column (83); the second pull rope (81) has a knot (811); the insert block (52) is provided with a first opening (84) connecting the inner cavity and the first groove (511); the first groove (511) is provided with a second opening (85) penetrating the side of the needle (11); one end of the second pull rope (81) is fixedly arranged on the movable block (65); the other end of the second pull rope (81) passes through the elastic block (64), the fixed block (63), the first opening (84) and the second opening (85) in sequence and extends out and is fixed on the pull ring (82); the knot (811) is located in the inner cavity and cannot pass through the first opening (84); when the knot (811) abuts against the side wall of the inner cavity close to the first opening (84), the movable block (65) is separated from the groove (512); The fixing column (83) is fixedly arranged on the outer wall of the cylinder (1). The fixing column (83) is arranged in a column cone shape. The pulling ring (82) is hooked on the fixing column (83). When the pulling ring (82) is hooked on the fixing column (83), the insert block (52) is separated from the limiting groove (23).

7. A quantitative injection syringe according to claim 1, characterized in that: The sliding limiting member (3) comprises a second sliding groove (31) and a first block (32), wherein the first block (32) is fixedly arranged on the inner wall of the syringe, and the second sliding groove (31) is opened on the side wall of the push rod (2) along the axial direction of the syringe, and the end of the first block (32) is slidably connected to the second sliding groove (31).

Images