Suspended type needle-stick-injury-preventing needle head used during CRRT pre-flushing blood return

Abstract

The invention discloses a suspension type anti-needle-stick-injury needle head during CRRT pre-flushing blood return, the suspension type anti-needle-stick-injury needle head comprises a needle head seat, a needle head part arranged on one side of the needle head seat and a reset spring connected to the needle head part in a sleeving mode, one end of the reset spring is connected with a protection mechanism, the protection mechanism is rapidly connected with a connection seat in a clamping mode, and the connection seat is arranged on one side of the needle head seat; the protection mechanism comprises a protection sleeve, the needle head part penetrates through the protection sleeve, one end of the reset spring is connected with the protection sleeve, reeds are symmetrically arranged on one side of the protection sleeve, locking buckles are arranged at one ends of the reeds, and guide-in structures corresponding to the reeds are arranged on the connecting base; a rapid fixing mechanism is further arranged on one side of the protective sleeve, a hanging belt mechanism used for hanging the device is arranged on the connecting base, the needle head part can be rapidly guided out at a time, operation is convenient and fast, the needle head part and a dialysis tube can be fixed, meanwhile, the device can be hung, and the device is convenient to use. And the needle head part is prevented from being loosened from the dialysis tube.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a suspended needle head for preventing needlestick injuries during CRRT pre-flushing and blood return. Background Art

[0002] CRRT is one of the common technologies in critical care medicine. It is suitable for acute and chronic renal failure, pesticide poisoning, severe pancreatitis, heart failure and other diseases, and plays a huge role in treating critically ill patients. CRRT not only has high technical requirements for critical care nurses, but also poses high risks to critical care nurses, such as needlestick injuries. CRRT often faces the need to be taken off the machine during use. Before the patient goes out for examination, the machine is faced with pre-flushing and self-circulation. When the CRRT pressure suddenly increases, the machine is faced with blood return and the machine is taken off. However, there is currently no dedicated needle for taking the machine off. A 50ml syringe needle is used instead. When using this needle, nurses face two huge risks: one is needlestick injury and the other is infection. The risk of infection is that this needle cannot bear weight, and it is very easy for the needle to fall out after being connected to the dialysis tube, and blood will splash in the nurse's eyes. At the same time, the nurse faces a needlestick injury, and when the needle is picked up, it will face another needlestick injury.

[0003] For example, a needle-stick-proof needle disclosed in the utility model with authorization announcement number CN209575441U is composed of a spring device and a needle device, the spring device is sleeved on the needle device, and the lower end of the spring device is fixedly arranged at the lower end of the needle device; in the initial state, the spring device is in a retracted state, the upper cover is threadedly connected to the fixed base, the spring is in a compressed state, the needle is exposed, and the medical staff installs the needle fixing seat on the nipple of the syringe. When the medical staff finishes using the syringe, they screw the upper cover back to separate the upper cover and the fixed base, the spring drives the upper cover to pop up, and the upper cover wraps the needle to prevent the needle from stabbing the medical staff. This solution can protect users from the risk of needle pricks or infectious diseases before and after use, and also prevent needle pricks from injuring staff when handling syringes. However, the above solution has the following problems: the above solution is connected by a spiral knob, and then the needle is used. The operation has many rotation steps and cannot be connected quickly, which may easily cause personal punctures. At the same time, after use, it cannot be quickly unfolded, the protective performance is poor, and when it cannot be connected to the dialysis tube, it cannot be locked with the dialysis tube. At the same time, it cannot be hung and placed, which may easily cause the needle to loosen and cause personal infection. For this reason, we propose a hanging anti-needlestick needle during CRRT pre-flushing and blood return. Summary of the invention

[0004] The purpose of the present invention is to provide a hanging anti-needlestick needle for CRRT pre-flushing and blood return, so as to solve the problem that the prior art proposed in the above background technology is connected by a spiral knob and then the needle is used. The operation has many rotation steps and cannot be quickly connected, which may easily cause punctures to people. At the same time, after use, it cannot be quickly unfolded, the protective performance is poor, and when it cannot be connected to the dialysis tube, it cannot be locked with the dialysis tube. At the same time, it cannot be hung and placed, which may easily cause the needle to loosen and cause personal infection.

[0005] To achieve the above object, the present invention provides the following technical solutions: a suspended needle-stick-proof needle for CRRT pre-flushing and blood return, comprising a needle seat, a needle head arranged on one side of the needle seat, and a return spring sleeved on the needle head, one end of the return spring is connected to a protective mechanism, the protective mechanism is quickly clamped with a connecting seat, and the connecting seat is arranged on one side of the needle seat;

[0006] The protection mechanism comprises a protection sleeve, the needle head penetrates the protection sleeve, one end of the reset spring is connected to the protection sleeve, the protection sleeve is a concave structure, a spring is symmetrically arranged on one side of the protection sleeve, a locking buckle is arranged at one end of the spring, and an introduction structure corresponding to the spring is arranged on the connection seat;

[0007] Among them, a quick fixing mechanism for connecting to the dialysis tube is also arranged on one side of the protective sleeve, and a connecting seat is also arranged on one side of the connecting seat, and a hanging belt mechanism for hanging and placing the device is arranged on the connecting seat.

[0008] Preferably, the introduction structure includes an inclined introduction groove, which is arranged on one side surface of the connecting seat. The inclined introduction groove corresponds to the reed and can introduce the reed and compress the reed to cause elastic deformation.

[0009] Preferably, one side of the inclined guide groove is connected to the horizontal guide groove, and one end of the horizontal guide groove is connected to the positioning slot, so that the reed can be smoothly introduced and the reed can be automatically clamped and fixed, which is convenient to use and operate.

[0010] Preferably, longitudinally arranged adjustment buckles are movably provided on both sides of the connecting seat, and a first spring is sleeved on the outer surface of the adjustment buckle. Through the setting of the adjustment buckle, the spring leaf can be pushed to move and separate from the positioning slot at the same time, and then the protective cover can be quickly and automatically reset.

[0011] Preferably, limit buckles are symmetrically arranged on both sides of the adjustment buckle, and the limit buckles are slidably arranged in the limit grooves, and the limit grooves are arranged on both sides of the connecting seat. Through the arrangement of the limit buckles, the movement of the adjustment buckle can be limited.

[0012] Preferably, the quick fixing mechanism includes a needle sleeve, and the needle sleeve is arranged on one side surface of the protective sleeve. The needle sleeve is also connected to a turntable by a threaded rotation, and a chamfering drive part is arranged on one side of the inner surface of the turntable. The needle sleeve is provided with multiple groups of locking components that move with the turntable and clamp the dialysis tube. When protecting the needle head, it can also be connected and fixed to the dialysis tube, thereby effectively preventing the needle head from loosening.

[0013] Preferably, the locking assembly includes an arc-shaped driving block corresponding to the chamfering driving part, the arc-shaped driving block is arranged at one end of the push rod, the push rod is movably arranged in the guide hole, the guide hole is arranged on one side of the needle sleeve, one end of the guide hole is connected with the arc-shaped receiving groove, and the other end of the push rod is provided with an arc-shaped clamping plate, the arc-shaped clamping plate is arranged in the arc-shaped receiving groove, and the arc-shaped receiving groove is arranged on one side of the inner wall of the needle sleeve. By rotating the turntable, the needle sleeve can be quickly connected to the dialysis tube, and the connection operation is convenient.

[0014] Preferably, a second spring is also sleeved on the push rod, one end of the second spring is connected to the push rod, and the other end of the second spring is connected to the guide hole, which can drive the push rod to automatically reset and move, making it easy to separate the needle sleeve from the dialysis tube.

[0015] Preferably, the hanging strap mechanism includes a trapezoidal seat, which is arranged on the outer surface of the connecting seat, and a mounting groove is arranged on one side of the trapezoidal seat. A first rotating shaft is rotatably arranged in the mounting groove, a connecting plate is arranged on the first rotating shaft, and a hanging strap body is arranged on the connecting plate. A buckle assembly for automatically positioning the hanging angle of the trapezoidal seat is also arranged on one side of the trapezoidal seat, so that the device can be hung and placed.

[0016] Preferably, the buckle assembly includes a connecting rod, which is arranged on a second rotating shaft, and the second rotating shaft is rotatably arranged on one side of the trapezoidal seat. A torsion spring is also sleeved on the second rotating shaft. A positioning buckle is arranged at one end of the connecting rod, and the positioning buckle is engaged with a positioning tooth. The positioning tooth is arranged in a ring shape on one side of the rotating shaft. One end of the rotating shaft extends out of the surface of one side of the trapezoidal seat, which can be positioned at the hanging angle of the needle head, thereby improving the load-bearing capacity of the device and further improving the anti-dropping performance.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention can protect the needle head when not in use to prevent people from being stabbed. When in use, the needle head can be quickly guided out at one time, which is easy to operate, reduces the frequency of being stabbed during operation, and has good safety.

[0019] (2) The present application can fix the needle head and the dialysis tube, and can also suspend and place the device, and can adjust the suspension angle according to the direction of the dialysis tube, thereby improving the load-bearing capacity of the device, preventing the needle head and the dialysis tube from loosening, and preventing personal infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of a half-section structure of the present invention;

[0022] Figure 3 It is a half-section structural schematic diagram of the protection mechanism in the present invention;

[0023] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 It is a schematic diagram of the front cross-sectional structure of the needle head in the present invention when it is in use;

[0025] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 7 It is a half-section structural schematic diagram of the quick fixing mechanism in the present invention;

[0027] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0028] Fig. 9 It is a schematic diagram of the main cross-sectional structure when the needle head is connected to the dialysis tube in the present invention;

[0029] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure at D in the middle;

[0030] Fig.11 It is a partial structural schematic diagram of the connecting seat and the connecting seat in the present invention;

[0031] Fig.12 It is a schematic diagram of the overall structure of the hanging belt mechanism in the present invention;

[0032] Fig.13 for Fig.12 Schematic diagram of the enlarged structure at E in the middle;

[0033] Fig.14 It is a partial structural schematic diagram of the hanging belt mechanism in the present invention;

[0034] In the figure: 1, protection mechanism; 2, quick fixing mechanism; 3, needle head; 4, connecting seat; 5, connecting seat; 6, hanging belt mechanism; 7, needle head seat; 8, reset spring; 9, dialysis tube; 61, trapezoidal seat; 62, hanging belt body; 63, connecting plate; 64, first rotating shaft; 65, positioning tooth; 66, second rotating shaft; 67, connecting rod; 68, positioning buckle; 69, mounting slot; 101, inclined introduction slot; 102, Adjusting buckle; 103, horizontal guide groove; 104, positioning slot; 105, limiting buckle; 106, limiting slot; 107, protective cover; 108, spring; 109, locking buckle; 110, first spring; 201, turntable; 202, needle sleeve; 203, chamfering drive unit; 204, arc-shaped drive block; 205, push rod; 206, arc-shaped clamping plate; 207, arc-shaped receiving groove; 208, second spring. DETAILED DESCRIPTION

[0035] 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.

[0036] See also Figure 1-Figure 6 The present invention provides a technical solution: a suspended needle-stick-proof needle during CRRT pre-flushing and blood return, comprising a needle seat 7, a needle head 3 arranged on one side of the needle seat 7, and a return spring 8 sleeved on the needle head 3, one end of the return spring 8 is connected to a protection mechanism 1, the protection mechanism 1 is quickly clamped with a connection seat 4, and the connection seat 4 is arranged on one side of the needle seat 7;

[0037] The protection mechanism 1 includes a protection sleeve 107, the needle head 3 passes through the protection sleeve 107, one end of the reset spring 8 is connected to the protection sleeve 107, the protection sleeve 107 is a concave structure, because the protection sleeve 107 is a concave shape, when the device is in use, the protection sleeve 107 can wrap the needle seat 7 to ensure that the needle head 3 is fully extended, a spring leaf 108 is symmetrically arranged on one side of the protection sleeve 107, a locking buckle 109 is arranged at one end of the spring leaf 108, and an introduction structure corresponding to the spring leaf 108 is arranged on the connecting seat 4.

[0038] The introduction structure includes an inclined introduction groove 101, which is arranged on one side surface of the connection seat 4. The inclined introduction groove 101 corresponds to the spring 108 and can introduce the spring 108 and compress the spring 108 to make it elastically deform.

[0039] One side of the inclined introduction slot 101 is connected to the horizontal guide slot 103, and one end of the horizontal guide slot 103 is connected to the positioning slot 104, so that the reed 108 can be smoothly introduced and the reed 108 can be automatically clamped and fixed, which is convenient to use and operate.

[0040] When the device is not in use, the reset spring 8 is in a fully expanded state. At this time, the protective cover and the quick fixing mechanism 2 are both in an expanded state. The needle head 3 can be protected by the protective cover and the quick fixing mechanism 2 to prevent the needle head 3 from being exposed and stabbing people. When it is needed to be used, the protective cover 107 is held and pushed backward. The protective cover 107 moves along the needle head 3 and compresses the reset spring 8. At the same time, the protective cover 107 drives the two sets of spring leaves 108 to move, and the protective cover 107 drives the quick fixing mechanism 2 to move. When the spring leaves 108 move to When in the inclined introduction groove 101, as the protective sleeve 107 moves, the spring leaf 108 is driven to move along the inclined introduction groove 101. Due to the inclination of the inclined introduction groove 101, when the spring leaf 108 moves, the spring leaf 108 is elastically deformed. The spring leaf 108 moves through the horizontal guide groove 103 and finally moves into the positioning card groove 104. The spring leaf 108 resets and moves, and the locking buckle 109 is snapped into the positioning card groove 104. At the same time, the protective sleeve 107 covers the needle seat 7 and is automatically locked and fixed with the connecting seat 4, thereby completely exposing the needle head 3.

[0041] In one embodiment, see Figure 5 as well as Figure 6 , longitudinally arranged adjusting buckles 102 are also movably provided on both sides of the connecting seat 4, and the first spring 110 is sleeved on the outer surface of the adjusting buckle 102. Through the setting of the adjusting buckle 102, the spring leaf 108 can be pushed to move at the same time, and the spring leaf 108 can be separated from the positioning slot 104, and then the protective cover 107 can be quickly and automatically reset.

[0042] When the device is used, the needle head 3 needs to be protected again. The adjustment buckle 102 can be pressed, and the adjustment buckle 102 moves to compress the first spring 110. When the adjustment buckle 102 is in contact with the spring leaf 108, the movement of the adjustment buckle 102 can drive the spring leaf 108 to elastically deform, and the locking buckle 109 can be moved out of the positioning slot 104. Under the elastic force of the reset spring 8, the protective sleeve 107 resets and moves, thereby automatically protecting the needle head 3 again to prevent people from being stabbed.

[0043] Specifically, the end of the adjusting buckle 102 may be a hemispherical structure, which ensures the smoothness of the end and prevents the locking buckle 109 from being engaged with the adjusting buckle 102 .

[0044] Furthermore, the limit buckles 105 are symmetrically arranged on both sides of the adjustment buckle 102. The limit buckles 105 are slidably arranged in the limit grooves 106. The limit grooves 106 are arranged on both sides of the connecting seat 4. When the adjustment buckle 102 moves, the limit buckle 105 is driven to move in the limit grooves 106 and limit the movement of the adjustment buckle 102.

[0045] See also Figure 7-10 A quick fixing mechanism 2 for connecting with the dialysis tube 9 is also provided on one side of the protective sleeve 107. The quick fixing mechanism 2 includes a needle sleeve 202. The needle sleeve 202 is provided on one side of the protective sleeve 107. The needle sleeve 202 is also connected to the turntable 201 by threaded rotation, and can rotate the turntable 201 and locate the rotation position of the turntable 201. A chamfering drive unit 203 is provided on one side of the inner surface of the turntable 201. A plurality of locking components are provided on the needle sleeve 202, which move with the turntable 201 to clamp the dialysis tube 9. When protecting the needle head 3, it can also be connected and fixed with the dialysis tube 9, effectively preventing the needle head 3 from loosening.

[0046] The locking assembly includes an arc-shaped driving block 204 corresponding to the chamfering driving portion 203. The arc-shaped driving block 204 is arranged at one end of a push rod 205. The push rod 205 is movably arranged in a guide hole. The guide hole is arranged on one side of the needle sleeve 202. One end of the guide hole is connected to an arc-shaped receiving groove 207. An arc-shaped clamping plate 206 is arranged at the other end of the push rod 205. The arc-shaped clamping plate 206 is arranged in the arc-shaped receiving groove 207. The arc-shaped receiving groove 207 is arranged on one side of the inner wall of the needle sleeve 202. By rotating the turntable 201, the needle sleeve 202 can be quickly connected to the dialysis tube 9, and the connection operation is convenient.

[0047] After the needle head 3 is completely exposed, the needle head 3 is inserted into the dialysis tube 9, and one end of the dialysis tube 9 is inserted into the needle sleeve 202, and then the turntable 201 is rotated. The rotation of the turntable 201 drives the chamfering drive part 203 to rotate and move. When the chamfering drive part 203 is in contact with the arc driving block 204, as the turntable 201 rotates and moves, the chamfering drive part 203 drives the arc driving block 204 to move, and the arc driving block 204 drives the push rod 205 to move in the guide hole. The movement of the push rod 205 drives the arc clamping plate 206 to move, and the arc clamping plate 206 moves out of the arc receiving groove 207. When the arc clamping plate 206 is in contact with the outer surface of the dialysis tube 9, the arc clamping plate 206 clamps and fixes the dialysis tube 9.

[0048] Furthermore, a second spring 208 is sleeved on the push rod 205, one end of the second spring 208 is connected to the push rod 205, and the other end of the second spring 208 is connected to the guide hole. During the clamping process of the dialysis tube 9, the push rod 205 compresses the second spring 208. When use is completed, the turntable 201 is rotated in the opposite direction to separate the turntable 201 from the arc-shaped driving block 204. The elastic force of the second spring 208 can drive the push rod 205 to automatically reset and move, thereby facilitating the separation of the needle sleeve 202 from the dialysis tube 9.

[0049] See also Figure 12-14 A connecting seat 5 is also provided on one side of the connecting seat 4, and a hanging belt mechanism 6 for hanging and placing the device is provided on the connecting seat 5. The hanging belt mechanism 6 includes a trapezoidal seat 61, and the trapezoidal seat 61 is provided on the outer surface of the connecting seat 5. A mounting groove 69 is provided on one side of the trapezoidal seat 61, and a first rotating shaft 64 is rotatably provided in the mounting groove 69. A connecting plate 63 is provided on the first rotating shaft 64, and a hanging belt body 62 is provided on the connecting plate 63. Through the hanging belt body 62, the device can be hung and placed. A buckle component for automatically positioning the hanging angle of the trapezoidal seat 61 is also provided on one side of the trapezoidal seat 61, so that the device can be hung and placed.

[0050] The buckle assembly includes a connecting rod 67, which is arranged on a second rotating shaft 66. The second rotating shaft 66 is rotatably arranged on one side of the trapezoidal seat 61. A torsion spring is also sleeved on the second rotating shaft 66. A positioning buckle 68 is arranged at one end of the connecting rod 67. The positioning buckle 68 is engaged with the positioning tooth 65. The positioning tooth 65 is arranged in a ring shape on one side of the rotating shaft. One end of the rotating shaft extends out of the surface of one side of the trapezoidal seat 61, which can be positioned at the hanging angle of the needle head 3, thereby improving the load-bearing capacity of the device and further improving the anti-slip performance.

[0051] When the needle head 3 is connected to the dialysis tube 9, the device is suspended and placed by the suspension belt 62. Then, the suspension angle of the needle head 3 can be adjusted according to the angle of the dialysis tube 9, and the connecting seat 5 is pushed downward. The connecting seat 5 drives the trapezoidal seat 61 to rotate along the rotating shaft, and the trapezoidal seat 61 drives the connecting rod 67 to rotate. The connecting rod 67 drives the positioning buckle 68 to move along the positioning tooth 65. The positioning buckle 68 drives the connecting rod 67 to rotate through the second rotating shaft 66. The second rotating shaft 66 drives the torsion spring to rotate. While the connecting seat 5 rotates, the needle head 3 is driven to rotate through the connecting seat 4. When the needle head 3 is parallel to the dialysis tube 9, the torsion spring drives the second rotating shaft 66 to reset and rotate, and drives the connecting rod 67 to reset and rotate. The reset rotation of the connecting rod 67 drives the positioning buckle 68 to reset and rotate, and is stuck in the corresponding positioning tooth 65, thereby positioning the suspension angle of the needle head 3, improving the bearing capacity of the device, and effectively preventing the needle head 3 from loosening.

[0052] 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 suspended needle head for preventing needle stick injuries during CRRT pre-flushing and blood return, comprising a needle head seat (7), a needle head (3) arranged on one side of the needle head seat (7), and a return spring (8) sleeved on the needle head (3), characterized in that: One end of the return spring (8) is connected to the protection mechanism (1), and the protection mechanism (1) is quickly connected to the connecting seat (4), and the connecting seat (4) is arranged on one side of the needle seat (7); The protection mechanism (1) comprises a protection sleeve (107), the needle head (3) passes through the protection sleeve (107), one end of the reset spring (8) is connected to the protection sleeve (107), the protection sleeve (107) is a concave structure, a spring leaf (108) is symmetrically arranged on one side of the protection sleeve (107), a locking buckle (109) is arranged at one end of the spring leaf (108), and an introduction structure corresponding to the spring leaf (108) is arranged on the connection seat (4); Among them, a quick fixing mechanism (2) for connecting to the dialysis tube (9) is also provided on one side of the protective sleeve (107), and a connecting seat (5) is also provided on one side of the connecting seat (4), and a hanging belt mechanism (6) for hanging and placing the device is provided on the connecting seat (5).

2. The CRRT pre-flushing blood return hanging type needle head according to claim 1, characterized in that: The introduction structure comprises an inclined introduction groove (101), the inclined introduction groove (101) is arranged on a side surface of the connection seat (4), and the inclined introduction groove (101) corresponds to the spring leaf (108).

3. The CRRT pre-flushing blood return hanging type needle head according to claim 2, characterized in that: One side of the inclined introduction groove (101) is connected to the horizontal guide groove (103), and one end of the horizontal guide groove (103) is connected to the positioning slot (104).

4. The CRRT pre-flushing blood return hanging type needle head according to claim 1 or 2, characterized in that: The two sides of the connection seat (4) are also movably provided with longitudinally arranged adjustment buckles (102), and the first spring (110) is sleeved on the outer surface of the adjustment buckle (102).

5. The CRRT pre-flushing blood return hanging type needle head according to claim 4, characterized in that: The limiting buckles (105) are symmetrically arranged on both sides of the adjusting buckle (102), and the limiting buckles (105) are slidably arranged in the limiting grooves (106), and the limiting grooves (106) are arranged on both sides of the connecting seat (4).

6. The CRRT pre-flushing blood return hanging type needle head according to claim 1, characterized in that: The quick fixing mechanism (2) comprises a needle sleeve (202), the needle sleeve (202) being arranged on a side surface of the protective sleeve (107), the needle sleeve (202) being rotatably connected to a turntable (201) via a thread, a chamfering drive unit (203) being arranged on one side of the inner surface of the turntable (201), and a plurality of locking components being arranged on the needle sleeve (202) for moving with the turntable (201) and clamping the dialysis tube (9).

7. The CRRT pre-flushing blood return hanging type needle head according to claim 6, characterized in that: The locking assembly comprises an arc-shaped driving block (204) corresponding to the chamfering driving portion (203); the arc-shaped driving block (204) is arranged at one end of a push rod (205); the push rod (205) is movably arranged in a guide hole; the guide hole is arranged on one side of the needle sleeve (202); one end of the guide hole is connected to an arc-shaped receiving groove (207); an arc-shaped clamping plate (206) is arranged at the other end of the push rod (205); the arc-shaped clamping plate (206) is arranged in the arc-shaped receiving groove (207); and the arc-shaped receiving groove (207) is arranged on one side of the inner wall of the needle sleeve (202).

8. The CRRT pre-flushing blood return hanging type needle head according to claim 7, characterized in that: The push rod (205) is also sleeved with a second spring (208), one end of the second spring (208) is connected to the push rod (205), and the other end of the second spring (208) is connected to the guide hole.

9. The CRRT pre-flushing blood return hanging type needle head according to claim 1, characterized in that: The hanging belt mechanism (6) includes a trapezoidal seat (61), the trapezoidal seat (61) is arranged on the outer surface of the connecting seat (5), a mounting groove (69) is arranged on one side of the trapezoidal seat (61), a first rotating shaft (64) is rotatably arranged in the mounting groove (69), a connecting plate (63) is arranged on the first rotating shaft (64), a hanging belt body (62) is arranged on the connecting plate (63), and a buckle component for automatically positioning the hanging angle of the trapezoidal seat (61) is also arranged on one side of the trapezoidal seat (61).

10. The CRRT pre-flushing blood return hanging type needle head according to claim 9, characterized in that: The buckle assembly comprises a connecting rod (67), wherein the connecting rod (67) is arranged on a second rotating shaft (66), wherein the second rotating shaft (66) is rotatably arranged on one side of the trapezoidal seat (61), wherein a torsion spring is also sleeved on the second rotating shaft (66), wherein a positioning buckle (68) is arranged at one end of the connecting rod (67), wherein the positioning buckle (68) is engaged with a positioning tooth (65), wherein the positioning tooth (65) is arranged in a ring shape on one side of the rotating shaft, and wherein one end of the rotating shaft extends out of a surface of one side of the trapezoidal seat (61).

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