Sharp needle and injection method

Abstract

The invention discloses a sharp needle and an injection method, and the sharp needle comprises a cylindrical handle rod; the needle tube is a sharp needle, namely one end of the needle tube is in a pointed-end inclined groove shape; the adjusting and fixing structure is arranged between the handle rod and the needle tube; the reinforced cleaning structure is arranged on the outer surface of the handle rod; under the action of the adjusting and fixing structure, the extension and storage conditions of the interior of the needle tube and the interior of the handle rod can be controlled, then the actual action length of the needle tube can be adjusted, and the needle tube can be adjusted according to different treatment requirements. According to the needle tube inserting device, the action length of the needle tube is adjusted in an auxiliary mode, the inserting requirement of a deep part or a shallow part can be met, needle tubes of different length sizes do not need to be replaced, the use cost is reduced, and meanwhile frequent operation and efficiency reduction are not needed.

Description

Technical Field

[0001] The invention relates to the technical field of sharp needles, in particular to a sharp needle and an injection method. Background Art

[0002] Compared with blunt needles, sharp needles have a sharp tip, which makes it easier to insert into the human body. Sharp needles are one of the common medical devices and are widely used in the field of infusion. They are generally used in conjunction with infusion systems or blood collection systems for auxiliary operations.

[0003] Taking into account the structure and function of the sharp needle during use, the use of the sharp needle will have a corresponding impact, which in turn determines the application scope of the sharp needle. Therefore, some sharp needles with special structures and functions can be used accordingly.

[0004] Generally, the traditional sharp needle and needle handle are fixed, resulting in a fixed actual insertion length of the sharp needle. When inserting into some shallow parts, the excessively long needle tube will cause looseness, thus affecting actual use. For insertion into some deeper parts, it is necessary to replace the long needle head for auxiliary operation, and thus it is necessary to prepare multiple needle tubes of different lengths for backup in actual treatment, which increases the overall cost. Moreover, the constant pulling out and pulling out will also cause human discomfort and reduce efficiency, which is very inconvenient. Moreover, when the needle tube is long, it is easy to bend in the middle during the insertion process, thus affecting the overall use and operation.

[0005] In summary, a sharp needle and an injection method need to be proposed to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a sharp needle and an injection method to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A sharp needle and an injection method, comprising:

[0009] A handle bar, which is cylindrical;

[0010] The needle tube is a sharp needle, that is, one end of the needle tube is pointed and slanted;

[0011] An adjusting and fixing structure, which is arranged between the handle rod and the needle tube;

[0012] A reinforcement cleaning structure, the reinforcement cleaning structure being arranged on the outer surface of the handle rod;

[0013] An anti-reverse protection structure is arranged at one end of the needle tube near the needle.

[0014] Preferably, the adjustment and fixing structure also includes a first screw hole opened on the inner wall of the handle rod, the inner wall of the first screw hole is threadedly connected to a first screw rod, a round socket is opened on the inner wall of one side of the handle rod, the needle tube is inserted into the inner wall of the round socket, and a first operating block is fixedly connected to one side of the outer surface of the first screw rod.

[0015] Preferably, a second screw hole is formed on the inner wall of the first operating block, a circular infusion hole is formed on the inner wall of the first screw rod, the second screw hole is communicated with the circular infusion hole, and a plurality of first anti-sliding blocks are fixedly connected to the outer surface of the first operating block, and the first anti-sliding blocks are arranged in an equidistant circle on the outer surface of the first operating block.

[0016] Preferably, the inner wall of the second screw hole is threadedly connected with a second screw, one side of the outer surface of the second screw is fixedly connected with an infusion tube, the infusion tube is inserted into the inner wall of the infusion circular hole, one side of the outer surface of the second screw is fixedly connected with a second operating block, the outer surface of the second operating block is fixedly connected with a plurality of second anti-slide blocks, the second anti-slide blocks are equidistantly arranged on the outer surface of the second operating block, and the second operating block and the inner wall of the second screw are provided with auxiliary circular holes.

[0017] Preferably, the reinforced cleaning structure also includes four rectangular sliding frames fixedly connected to the outer surface of the handle rod, the four rectangular sliding frames are arranged in equidistant circles on the outer surface of the handle rod, the inner wall of the rectangular sliding frame is slidably connected to a rectangular sliding block, the top of the outer surface of the rectangular sliding block is fixedly connected to a connecting block, one side of the outer surface of the connecting block is fixedly connected to a connecting rod, and one end of the outer surface of the connecting rod is fixedly connected to a connecting ring block.

[0018] Preferably, a locking rod is inserted into the inner wall of one of the connecting blocks and the rectangular sliding block at the bottom thereof, and the top of the locking rod is fixedly connected to an operating circular block, and a locking hole is opened on the bottom inner wall of one of the rectangular sliding frames, and the locking rod is detachably connected to the inner wall of the locking hole, and an annular clamping frame is fixedly connected to one side of the outer surface of the connecting circular ring block, and an annular clamping block is clamped on the inner wall of the annular clamping frame.

[0019] Preferably, a third screw hole is provided on the top inner wall of the annular clamping frame, a fourth screw hole is provided on the inner wall of the annular clamping block, a threaded clamping rod is threadedly connected to the inner walls of the third screw hole and the fourth screw hole, an annular block is fixedly connected to one side of the outer surface of the annular clamping block, and bristles are fixedly connected to the inner surface of the annular block.

[0020] Preferably, the anti-reverse protection structure also includes a rectangular through groove opened on the inner wall of the needle tube, the number of the rectangular through grooves is four, the four rectangular through grooves are arranged in an equidistant circle on the diameter of the needle tube, and a guide plate is fixedly connected to the inner wall of one side of the rectangular through groove.

[0021] Preferably, an arc plate is fixedly connected to one side of the outer surface of the guide plate, and a guide arc block is fixedly connected to the top of the outer surface of the guide plate.

[0022] Preferably, a sharp needle injection method is also included, comprising the following steps:

[0023] S1. The first screw is rotated and screwed into the first screw hole inside the handle bar, and the needle tube is inserted into the round plug hole. The first operating block is rotated to adjust the position of the first screw and the first screw hole. The first anti-sliding block can prevent the hand from slipping during rotation, and the needle tube can be driven to adjust the length of use, so that the needle tube can be stored inside the handle bar or extended outside the handle bar;

[0024] S2, insert the infusion tube into the infusion circular hole, rotate the second operating block, and then drive the second screw to fix with the inner wall of the second screw hole, and then the delivery liquid can flow to the infusion tube and the infusion circular hole through the auxiliary circular hole;

[0025] S3, at this time, slide the rectangular slider to make it slide on the inner wall of the rectangular sliding frame, thereby driving the connecting rod and the connecting block to move, thereby driving the connecting circular ring block to move, thereby driving the annular block and other components to move. When it moves to a suitable position, press the locking rod so that the locking rod can be locked into the inner wall of the locking hole, thereby completing the fixation;

[0026] S4, when the annular block needs to be disassembled, the threaded clamping rod is separated from the third screw hole and the fourth screw hole, and the annular clamping block is separated from the inner wall of the annular clamping frame, so that the annular block can be separated;

[0027] S5. At this time, the needle is inserted into the skin so that the infusion liquid flows from the needle into the blood vessel. When blood backflow occurs, the guide plate and the arc plate can slow down the backflow speed of the blood, and the guide arc block can be used to make the blood flow back into the blood vessel.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can control the internal extension and storage of the needle tube and the handle rod under the action of the adjusting fixing structure, and then can adjust the actual effective length of the needle tube, so that the needle tube can be assisted in adjusting the effective length of the needle tube according to different treatment needs, and then can meet the insertion needs of deeper or shallower parts respectively, and then there is no need to replace needle tubes of different lengths and sizes, thereby reducing the use cost and reducing efficiency without frequent operation. By setting a reinforced cleaning structure, the needle tube can be assisted in protection under the action of the connecting rod and the connecting circular ring block to avoid bending. At the same time, the outer surface of the needle tube can be assisted in cleaning under the action of the circular block and the bristles. By setting an anti-reverse protection structure, when the blood inside the needle tube refluxes, the blood can be guided by the guide arc block under the action of the guide plate and the arc plate, so that part of the blood returns to the blood vessel, thereby reducing the backflow of blood. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram showing the overall structure of a sharp needle and an injection method;

[0030] Figure 2 A schematic diagram showing the structure of a sharp needle and an injection method from above;

[0031] Figure 3 A schematic diagram showing the structure of the first screw rod of the sharp needle and the injection method;

[0032] Figure 4 A schematic diagram showing the structure of the second operation block of the sharp needle and injection method;

[0033] Figure 5 A schematic diagram showing the structure of the handle bar of the sharp needle and the injection method;

[0034] Figure 6 To illustrate the sharp needle and injection method Figure 5 The enlarged view of point A in the middle;

[0035] Figure 7 A schematic diagram showing the structure of the sharp needle and the connection ring of the injection method;

[0036] Figure 8 A schematic diagram showing the structure of the sharp needle and the annular block of the injection method;

[0037] Fig. 9 It is a structural schematic diagram showing the sharp needle and the anti-reverse protection structure of the injection method.

[0038] In the figure:

[0039] 1. Handle bar; 2. Needle tube;

[0040] 3. Adjustment and fixing structure; 31. First screw hole; 32. Round plug hole; 33. First screw rod; 34. First operation block; 35. Infusion round hole; 36. Second screw hole; 37. Infusion tube; 38. Second screw rod; 39. Second operation block; 310. Auxiliary round hole; 311. Second anti-sliding block; 312. First anti-sliding block;

[0041] 4. Reinforced cleaning structure; 41. Rectangular sliding frame; 42. Rectangular sliding block; 43. Connecting block; 44. Connecting rod; 45. Clamping rod; 46. Operating round block; 47. Clamping hole; 48. Connecting circular ring block; 49. Annular clamping frame; 410. Third screw hole; 411. Threaded clamping rod; 412. Annular clamping block; 413. Fourth screw hole; 414. Annular block; 415. Brush hair;

[0042] 5. Anti-reverse protection structure; 51. Rectangular through groove; 52. Guide plate; 53. Arc plate; 54. Guide arc block. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figures 1 to 9 , the present invention provides a technical solution:

[0045] A sharp needle and an injection method, comprising:

[0046] A handle bar 1, which is cylindrical;

[0047] The needle tube 2 is a sharp needle, that is, one end of the needle tube 2 is in the shape of a pointed bevel groove;

[0048] An adjusting and fixing structure 3, which is arranged between the handle bar 1 and the needle tube 2;

[0049] A reinforcement cleaning structure 4, which is arranged on the outer surface of the handle bar 1;

[0050] The anti-reverse protection structure 5 is arranged at one end of the needle tube 2 near the needle head.

[0051] Under the action of the adjusting fixing structure 3, the extension and storage of the needle tube 2 and the handle rod 1 can be controlled, and then the actual effective length of the needle tube 2 can be adjusted, so that the needle tube 2 can be assisted in adjusting the effective length of the needle tube 2 according to different treatment needs, and then the insertion needs of deeper or shallower parts can be met respectively, and then there is no need to replace needle tubes 2 of different lengths and sizes, thereby reducing the use cost and reducing efficiency without frequent operation. By setting up a reinforced cleaning structure 4, the needle tube 2 can be assisted in protection under the action of the connecting rod 44 and the connecting annular block 48 to avoid bending. At the same time, the outer surface of the needle tube 2 can be assisted in cleaning under the action of the annular block 414 and the bristles 415. By setting up an anti-reverse protection structure 5, when the blood inside the needle tube 2 refluxes, the blood can be guided by the guide plate 52 and the arc plate 53 in cooperation with the guide arc block 54, so that part of the blood returns to the blood vessel, thereby reducing the backflow of blood.

[0052] refer to Figure 3 , Figure 5 and Figure 7 The adjusting and fixing structure 3 also includes a first screw hole 31 formed on the inner wall of the handle bar 1, a first screw rod 33 is threadedly connected to the inner wall of the first screw hole 31, a round plug hole 32 is formed on one inner wall of the handle bar 1, the needle tube 2 is inserted into the inner wall of the round plug hole 32, and a first operating block 34 is fixedly connected to one side of the outer surface of the first screw rod 33;

[0053] By providing the first screw rod 33 and the first screw hole 31 , the first screw rod 33 can slide on the inner wall of the first screw hole 31 , and can further cooperate with the needle tube 2 to adjust the length.

[0054] refer to Figure 3 The inner wall of the first operating block 34 is provided with a second screw hole 36, the inner wall of the first screw rod 33 is provided with an infusion circular hole 35, the second screw hole 36 is connected to the infusion circular hole 35, and the outer surface of the first operating block 34 is fixedly connected with a plurality of first anti-sliding blocks 312, and the first anti-sliding blocks 312 are arranged equidistantly on the outer surface of the first operating block 34;

[0055] By providing the second screw hole 36 and the first operating block 34 , the first anti-sliding block 312 can be cooperated to perform auxiliary operation, and then the infusion circular hole 35 and other components can be cooperated to perform auxiliary infusion.

[0056] refer to Figure 3 and Figure 4The inner wall of the second screw hole 36 is threadedly connected with a second screw rod 38, one side of the outer surface of the second screw rod 38 is fixedly connected with an infusion tube 37, and the infusion tube 37 is inserted into the inner wall of the infusion circular hole 35, and one side of the outer surface of the second screw rod 38 is fixedly connected with a second operating block 39, and the outer surface of the second operating block 39 is fixedly connected with a plurality of second anti-sliding blocks 311, and the second anti-sliding blocks 311 are equidistantly arranged on the outer surface of the second operating block 39, and the inner walls of the second operating block 39 and the second screw rod 38 are provided with auxiliary circular holes 310;

[0057] By setting the second screw rod 38, the infusion tube 37 can be assisted in fixing and inserting, and the second operating block 39 and the second anti-sliding block 311 can be used for auxiliary operation.

[0058] Through the above scheme, during specific use, the first screw 33 is rotated and screwed into the first screw hole 31 inside the handle rod 1. At this time, the needle tube 2 is inserted into the circular plug hole 32. At this time, the position of the first screw 33 and the first screw hole 31 is adjusted by rotating the first operating block 34. The first anti-sliding block 312 can prevent hand slippage during rotation, and then drive the needle tube 2 to adjust the use length, so that the needle tube 2 can be stored in the handle rod 1 or extend out of the handle rod 1. At this time, the infusion tube 37 is inserted into the infusion circular hole 35. At this time, the second operating block 39 is rotated, and then the second screw 38 can be driven to be fixed to the inner wall of the second screw hole 36, and then the delivery liquid can flow to the infusion tube 37 and the inside of the infusion circular hole 35 through the auxiliary circular hole 310.

[0059] refer to Figure 5 and Figure 6 The reinforcement cleaning structure 4 also includes four rectangular sliding frames 41 fixedly connected to the outer surface of the handle rod 1. The four rectangular sliding frames 41 are arranged in an equidistant circle on the outer surface of the handle rod 1. The inner wall of the rectangular sliding frame 41 is slidably connected with a rectangular slider 42. The top of the outer surface of the rectangular slider 42 is fixedly connected with a connecting block 43. One side of the outer surface of the connecting block 43 is fixedly connected with a connecting rod 44. One end of the outer surface of the connecting rod 44 is fixedly connected with a connecting ring block 48.

[0060] By setting the rectangular sliding frame 41, the rectangular sliding block 42 can be matched to make the connecting rod 44 and the connecting block 43 move, thereby driving the connecting ring block 48 to move, thereby protecting the needle tube 2.

[0061] refer to Figure 6 and Figure 7A locking rod 45 is inserted into the inner wall of one of the connecting blocks 43 and the rectangular sliding block 42 at the bottom thereof, and an operating round block 46 is fixedly connected to the top of the locking rod 45. A locking hole 47 is opened on the inner wall of the bottom of one of the rectangular sliding frames 41, and the locking rod 45 is detachably engaged with the inner wall of the locking hole 47. An annular clamping frame 49 is fixedly connected to one side of the outer surface of the connecting circular ring block 48, and an annular clamping block 412 is engaged with the inner wall of the annular clamping frame 49;

[0062] By providing the locking rod 45 and the locking hole 47 , the connection block 43 and other components after adjustment can be additionally limited and fixed.

[0063] refer to Figure 7 and Figure 8 A third screw hole 410 is formed on the inner wall of the top of the annular clamping frame 49, a fourth screw hole 413 is formed on the inner wall of the annular clamping block 412, a threaded clamping rod 411 is threadedly connected to the inner walls of the third screw hole 410 and the fourth screw hole 413, an annular block 414 is fixedly connected to one side of the outer surface of the annular clamping block 412, and bristles 415 are fixedly connected to the inner surface of the annular block 414;

[0064] By providing the third screw hole 410 and the fourth screw hole 413 , the annular clamping block 412 and the annular clamping frame 49 can be assembled and disassembled by cooperating with the threaded clamping rod 411 .

[0065] Through the above structure, the rectangular slider 42 is slid to slide on the inner wall of the rectangular slide frame 41, which can drive the connecting rod 44 and the connecting block 43 to move, and then drive the connecting circular ring block 48 to move, and then drive the annular block 414 and other components to move. When it moves to the appropriate position, the locking rod 45 is pressed so that the locking rod 45 can be locked into the inner wall of the locking hole 47 to complete the fixation. When the annular block 414 needs to be disassembled, the threaded locking rod 411 is separated from the third screw hole 410 and the fourth screw hole 413, and the annular clamping block 412 is separated from the inner wall of the annular clamping frame 49, so that the annular block 414 can be separated.

[0066] refer to Figure 1 and Fig. 9 The anti-reverse protection structure 5 also includes a rectangular through groove 51 formed on the inner wall of the needle tube 2. The number of the rectangular through grooves 51 is four. The four rectangular through grooves 51 are arranged in an equidistant circle on the diameter of the needle tube 2. A guide plate 52 is fixedly connected to the inner wall of one side of the rectangular through groove 51.

[0067] By providing the guide plate 52, the blood can be assisted in being guided, thereby reducing the speed of the blood when it flows back.

[0068] refer to Fig. 9 , an arc plate 53 is fixedly connected to one side of the outer surface of the guide plate 52, and a guide arc block 54 is fixedly connected to the top of the outer surface of the guide plate 52;

[0069] By providing the arc plate 53 and the guide arc block 54, the blood can be assisted in being guided, thereby reducing the speed of blood backflow.

[0070] Through the above structure, the needle tube 2 is inserted into the skin, so that the infusion liquid flows from the needle tube 2 into the blood vessel. When blood backflow occurs, the backflow speed of the blood can be slowed down under the action of the guide plate 52 and the arc plate 53, and the guide arc block 54 can be used to make the blood flow back into the blood vessel.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sharp needle, characterized in that: include: A handle bar (1), the handle bar (1) is cylindrical; The needle tube (2) is a sharp needle, that is, one end of the needle tube (2) is in the shape of a pointed bevel groove; An adjusting and fixing structure (3), wherein the adjusting and fixing structure (3) is arranged between the handle rod (1) and the needle tube (2); A reinforcement cleaning structure (4), the reinforcement cleaning structure (4) being arranged on the outer surface of the handle rod (1); An anti-reverse protection structure (5) is arranged at one end of the needle tube (2) near the needle head.

2. A sharp needle according to claim 1, characterized in that: The adjusting and fixing structure (3) further comprises a first screw hole (31) formed on the inner wall of the handle bar (1), the inner wall of the first screw hole (31) being threadedly connected to a first screw rod (33), a round plug hole (32) being formed on one inner wall of the handle bar (1), the needle tube (2) being inserted into the inner wall of the round plug hole (32), and a first operating block (34) being fixedly connected to one side of the outer surface of the first screw rod (33).

3. A sharp needle according to claim 2, characterized in that: The inner wall of the first operating block (34) is provided with a second screw hole (36), the inner wall of the first screw rod (33) is provided with an infusion circular hole (35), the second screw hole (36) is communicated with the infusion circular hole (35), and the outer surface of the first operating block (34) is fixedly connected with a plurality of first anti-sliding blocks (312), the first anti-sliding blocks (312) being arranged in an equidistant circle on the outer surface of the first operating block (34).

4. A sharp needle according to claim 3, characterized in that: The inner wall of the second screw hole (36) is threadedly connected to a second screw rod (38); one side of the outer surface of the second screw rod (38) is fixedly connected to an infusion tube (37); the infusion tube (37) is inserted into the inner wall of the infusion circular hole (35); one side of the outer surface of the second screw rod (38) is fixedly connected to a second operating block (39); the outer surface of the second operating block (39) is fixedly connected to a plurality of second anti-sliding blocks (311); the second anti-sliding blocks (311) are equidistantly arranged on the outer surface of the second operating block (39); and the inner walls of the second operating block (39) and the second screw rod (38) are provided with auxiliary circular holes (310).

5. A sharp needle according to claim 1, characterized in that: The reinforced cleaning structure (4) further comprises four rectangular sliding frames (41) fixedly connected to the outer surface of the handle rod (1); the four rectangular sliding frames (41) are arranged in an equidistant circle on the outer surface of the handle rod (1); the inner wall of the rectangular sliding frame (41) is slidably connected to a rectangular sliding block (42); the top of the outer surface of the rectangular sliding block (42) is fixedly connected to a connecting block (43); one side of the outer surface of the connecting block (43) is fixedly connected to a connecting rod (44); and one end of the outer surface of the connecting rod (44) is fixedly connected to a connecting ring block (48).

6. A sharp needle according to claim 5, characterized in that: A locking rod (45) is inserted into the inner wall of one of the connecting blocks (43) and the rectangular sliding block (42) at the bottom thereof, and the top of the locking rod (45) is fixedly connected to an operating circular block (46). A locking hole (47) is opened on the inner wall of the bottom of one of the rectangular sliding frames (41), and the locking rod (45) is detachably engaged with the inner wall of the locking hole (47). An annular locking frame (49) is fixedly connected to one side of the outer surface of the connecting circular ring block (48), and an annular locking block (412) is engaged to the inner wall of the annular locking frame (49).

7. A sharp needle according to claim 5, characterized in that: A third screw hole (410) is provided on the top inner wall of the annular clamping frame (49), a fourth screw hole (413) is provided on the inner wall of the annular clamping block (412), a threaded clamping rod (411) is threadedly connected to the inner walls of the third screw hole (410) and the fourth screw hole (413), an annular block (414) is fixedly connected to one side of the outer surface of the annular clamping block (412), and bristles (415) are fixedly connected to the inner surface of the annular block (414).

8. A sharp needle according to claim 1, characterized in that: The anti-reversal protection structure (5) further comprises a rectangular through groove (51) formed on the inner wall of the needle tube (2), wherein the number of the rectangular through grooves (51) is four, and the four rectangular through grooves (51) are arranged in an equidistant circle on the diameter of the needle tube (2), and a guide plate (52) is fixedly connected to the inner wall of one side of the rectangular through groove (51).

9. A sharp needle according to claim 8, characterized in that: An arc plate (53) is fixedly connected to one side of the outer surface of the guide plate (52), and a guide arc block (54) is fixedly connected to the top of the outer surface of the guide plate (52).

10. A sharp needle according to any one of claims 1 to 9, characterized in that: Also included is a sharp needle injection method, comprising the following steps: S1. The first screw rod (33) is rotated and screwed into the first screw hole (31) inside the handle rod (1). At this time, the needle tube (2) is inserted into the inside of the round plug hole (32). At this time, the position of the first screw rod (33) and the first screw hole (31) is adjusted by rotating the first operating block 34. The first anti-sliding block (312) can prevent the hand from slipping during rotation, thereby driving the needle tube (2) to adjust the length for use, thereby allowing the needle tube (2) to be stored inside the handle rod (1) or extended outside the handle rod (1); S2, inserting the infusion tube (37) into the infusion circular hole (35), rotating the second operating block (39), thereby driving the second screw rod (38) to be fixed to the inner wall of the second screw hole (36), and then allowing the delivery liquid to flow to the infusion tube (37) and the infusion circular hole (35) through the auxiliary circular hole (310); S3, at this time, the rectangular slider (42) is slid to slide on the inner wall of the rectangular slide frame (41), thereby driving the connecting rod (44) and the connecting block (43) to move, thereby driving the connecting circular ring block (48) to move, thereby driving the annular block (414) and other components to move. When the components move to a suitable position, the locking rod (45) is pressed so that the locking rod (45) can be locked into the inner wall of the locking hole (47), thereby completing the fixation; S4. When the annular block (414) needs to be disassembled, the threaded clamping rod (411) is separated from the third screw hole (410) and the fourth screw hole (413), and the annular clamping block (412) is separated from the inner wall of the annular clamping frame (49), so that the annular block (414) can be separated; S5. At this time, the needle tube (2) is inserted into the skin so that the infusion liquid flows from the needle tube (2) into the blood vessel. When blood backflow occurs, the backflow speed of the blood can be slowed down under the action of the guide plate (52) and the arc plate (53), and the guide arc block (54) can be used to make the blood flow back into the blood vessel.

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