Arteriovenous puncture needle

Abstract

The invention provides an arteriovenous puncture needle, and relates to the technical field of medical instruments, the arteriovenous puncture needle comprises a first fixing piece, the first fixing piece is slidably connected with a puncture needle, the puncture needle is provided with scales, the puncture needle is fixedly connected with a pushing piece, the pushing piece is fixedly connected with a short rod, and the side, close to the pushing piece, of the puncture needle is communicated with a hose; the bottom face of the first fixing piece is fixedly connected with a second connecting piece, and the second connecting piece is rotationally connected with a first connecting piece. The device is fixedly connected to the arm of a patient through the stabilizing ring, then the first fixing piece is rotated clockwise, the first fixing piece drives the second connecting piece to rotate clockwise, the first fixing piece drives the puncture needle to further drive the pushing piece to rotate clockwise, and when the pushing piece drives the puncture needle to be pushed forwards, the needle can be inserted at a proper needle inserting angle; the problem that the needle inserting angle is incorrect due to the fact that the hands of new medical staff are unstable is solved, and meanwhile under the limiting effect of the limiting piece on the ratchet wheel, the ratchet wheel cannot drive the second connecting piece to rotate anticlockwise.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an arteriovenous puncture needle. Background Art

[0002] Among medical devices, arteriovenous puncture needles are very common and are suitable for many medical scenarios, especially medical operations such as dialysis that require establishing a temporary blood access.

[0003] When dialysis is to be performed, medical staff need to establish a temporary blood access on the patient's arm, and need to use an arteriovenous puncture needle. First, the medical staff connects the arteriovenous puncture needle to the hemodialysis machine, and then uses the arteriovenous puncture needle to pierce the patient's blood vessel, and then uses tape to fix the arteriovenous puncture needle to the patient's arm to prevent the arteriovenous puncture needle from shaking, and then performs the dialysis operation. Generally, the first puncture of hemodialysis requires experienced medical staff. Inexperienced medical staff have unstable hands, which leads to the inability to grasp the needle insertion angle, and the accuracy is low. The wrong needle insertion angle will cause great pain to the patient and easily cause damage to the blood vessels. Therefore, an arteriovenous puncture needle with adjustable needle insertion angle is designed. Summary of the invention

[0004] The present invention provides an arteriovenous puncture needle, which is designed to overcome the disadvantages of inexperienced medical personnel not being able to grasp the correct needle insertion angle and having a low accuracy rate.

[0005] The technical solution is: an arteriovenous puncture needle, including a first fixing part, a puncture needle is slidably connected to the first fixing part, the puncture needle is composed of a needle tube and a needle, a scale is set on the puncture needle, a propulsion part is fixedly connected to the puncture needle, a short rod is fixedly connected to the propulsion part, a hose is connected to the side of the puncture needle close to the propulsion part, a second connecting part is fixedly connected to the bottom surface of the first fixing part, the second connecting part is rotatably connected to the first connecting part, and an obstruction component that can prevent the second connecting part from rotating counterclockwise is connected to the second connecting part.

[0006] Furthermore, a stabilizing ring is included, which is fixedly connected to the bottom of the first connecting member, and the stabilizing ring is made of hard plastic, soft plastic and Velcro.

[0007] Furthermore, the obstruction assembly includes a plurality of ratchets, which are fixedly connected to the second connecting member, one side of the ratchet teeth is an arc surface, and the other side is a right-angle surface, a protrusion is provided on the side of the first connecting member close to the ratchet, the protrusion is slidably connected to a limiting member, one side of the limiting member close to the ratchet is a right-angle surface, and the other side is an arc surface, a plurality of first springs are fixedly connected between the limiting member and the protrusion, and the limiting member is extrusion-fitted with the corresponding ratchet.

[0008] Furthermore, it also includes a protection mechanism that can protect the needle and prevent the needle from curling. The protection mechanism includes a second fixing member, the second fixing member is fixedly connected to the first fixing member, a rotating member is rotatably connected to the second fixing member, a gear is fixedly connected to a side of the rotating member close to the propulsion member, a protective member is fixedly connected to a side of the first fixing member away from the propulsion member, and the propulsion member is connected to a rotating component that allows the rotating member to rotate.

[0009] Furthermore, the rotating assembly includes a first connecting rod, the first connecting rod is fixedly connected to the top of the propulsion member, and a rack is fixedly connected to a side of the first connecting rod away from the propulsion member, and the gear and the rack are meshed with each other.

[0010] Furthermore, it also includes a stretching mechanism that can stretch the skin before needle insertion, and the stretching mechanism includes a plurality of guide rods, which are slidably connected to the first fixed member, and the sides of the guide rods close to the propulsion member are provided with inclined surfaces, and the sides of the guide rods away from each other are fixedly connected to the first fixed member with a second spring, and the side of the guide rods away from the propulsion member is rotatably connected to a stabilizing rod, and a first torsion spring is fixedly connected between the stabilizing rod and the guide rod.

[0011] Furthermore, a first sliding rod is fixedly connected to one side of the propulsion member close to the guide rod, and the first sliding rod is extruded and matched with the inclined surface arranged on the guide rod.

[0012] Furthermore, it also includes a positioning mechanism that can grasp the needle insertion depth, the positioning mechanism includes a plurality of limit plates, the limit plates are fixedly connected to the first fixing member, the limit plates are provided with a plurality of teeth, the first fixing member is fixedly connected with a second connecting rod, the second connecting rod is slidably connected to the propulsion member, a positioning member is slidably connected to the puncture needle, the positioning member is slidably connected to the second connecting rod, the positioning member is slidably connected to a plurality of second sliding rods, a third spring is fixedly connected between the second sliding rod and the positioning member, and a limiting component that can limit the forward and backward movement of the propulsion member is provided on the positioning member.

[0013] Furthermore, the limiting assembly includes a limiting member, which is rotatably connected to the positioning member, and is provided with an inclined surface. The limiting member is squeezed and matched with a short rod provided on the propulsion member, and a second torsion spring is fixedly connected between the limiting member and the positioning member.

[0014] Furthermore, a rubber strip is provided at the bottom of the stabilizing bar.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention fixes the device to the patient's arm through a stabilizing ring, and then rotates the first fixing member clockwise, the first fixing member drives the second connecting member to rotate clockwise, the first fixing member drives the puncture needle and then drives the propulsion member to rotate clockwise, so that when the propulsion member drives the puncture needle forward, the needle can be inserted at a suitable insertion angle, thereby avoiding the problem of incorrect insertion angle caused by the unstable hands of new medical staff, and at the same time, under the limiting effect of the limiting member on the ratchet, the ratchet will not drive the second connecting member to rotate counterclockwise. The present invention adopts a humanized design, in which the smooth puncture surface and tip design of the ultra-thin wall needle can effectively reduce the patient's Pain and tissue damage, the rotatable needle wing design makes the operation more flexible, easy to adjust the angle, and convenient for puncture positioning, which can help doctors find the blood vessel position quickly and accurately. The present invention uses labels of different colors or models to help medical staff identify and select suitable specifications more quickly. The catheter of the puncture needle of the present invention is made of soft and elastic PVC material to reduce the movement of the needle in the body. At the same time, the present invention is made of medical grade raw materials, which not only has good biocompatibility, but also can reduce damage to the blood vessel wall, thereby improving the patient's comfort, and through precise manufacturing technology and unique design, the present invention can achieve fast and accurate puncture operations.

[0016] 2. The present invention combines a protective part and a rotating part to protect the puncture needle, prevent the puncture needle from curling, and prevent impurities in the air from adhering to the needle head of the puncture needle 1, thereby playing an isolation and anti-fouling role. At the same time, the present invention adopts a sterile and disposable design, avoiding the risk of cross infection caused by repeated use, ensuring the sterile state each time it is used, thereby ensuring the safety of the patient.

[0017] 3. The present invention increases the friction between the stabilizing rod and the patient's arm skin by means of the rubber strip disposed on the lower side of the stabilizing rod, and drives the first sliding rod to move forward through the propulsion member. The first sliding rod squeezes the guide rod, causing the guide rod to move toward the side away from each other. The guide rod drives the stabilizing rod to move toward the side away from each other, causing the stabilizing rod to stretch the patient's wrinkled skin, thereby reducing the difficulty of needle insertion.

[0018] 4. In the present invention, medical staff can move the positioning member to a specified position, and the teeth on the limit plate limit the second sliding rod, so that the position of the positioning member is fixed, so that the distance that the propulsion member drives the puncture needle forward is determined, and the depth of the puncture needle is determined, thereby avoiding the situation where the medical staff may have an uncertain insertion depth due to unstable hands. At the same time, under the limiting effect of the limit member and the second connecting rod, the propulsion member will not drive the puncture needle to move back and forth and rotate, thereby reducing the damage of the puncture needle to the patient's blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the puncture needle, the propulsion member, the hose and other components of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the first fixing member, the puncture needle, the propulsion member and other components of the present invention.

[0022] Figure 4 It is a sectional view of the three-dimensional structure of the ratchet, the first connecting member, the second connecting member and other components of the present invention.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the ratchet, the limiting member, the first spring and other components of the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the first connecting rod, the protective member, the rack and other components of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the rotating member, the protective member and the second fixing member of the present invention.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the rack, protective member, puncture needle and other components of the present invention.

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the expansion mechanism of the present invention.

[0028] Fig.10 It is a schematic diagram of the three-dimensional structure of the stabilizer bar, the second spring, the first torsion spring and other components of the present invention.

[0029] Fig.11 It is a schematic diagram of the three-dimensional structure of the positioning mechanism of the present invention.

[0030] Fig.12 It is a schematic diagram of the three-dimensional structure of the positioning member, the limiting plate, the puncture needle and other components of the present invention.

[0031] Fig.13 It is a schematic diagram of the three-dimensional structure of the positioning member, the puncture needle, the second connecting rod and other components of the present invention.

[0032] Fig.14 It is a schematic diagram of the three-dimensional structure of the limiter, the third spring, the second torsion spring and other components of the present invention.

[0033] The meanings of the reference numerals in the figure are: 1-puncture needle, 11-propelling member, 12-hose, 13-first fixing member, 14-stabilizing ring, 15-first connecting member, 16-second connecting member, 17-ratchet, 18-limiting member, 19-first spring, 2-rotating member, 21-protecting member, 22-gear, 23-rack, 24-first connecting rod, 25-second fixing member, 3-first sliding rod, 31-stabilizing rod, 32-guide rod, 33-first torsion spring, 34-second spring, 4-positioning member, 41-second connecting rod, 42-limiting plate, 43-second sliding rod, 44-third spring, 45-second torsion spring, 46-limiting member. DETAILED DESCRIPTION

[0034] 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.

[0035] Example 1: An arteriovenous puncture needle, see Figure 1-Figure 5 , including a first fixing member 13, the first fixing member 13 is a needle wing, and a puncture needle 1 is slidably connected to the first fixing member 13. The puncture needle 1 is composed of a needle tube and a needle, wherein the needle is made of an ultra-thin material, and the ultra-thin wall needle adopts a smooth puncture surface and a tip design, which can effectively reduce the patient's pain and tissue damage. The catheter of the puncture needle is made of soft and elastic PVC material to reduce the movement of the needle in the body. At the same time, the needle wing adopts different color logos and the needle adopts different models, which is helpful for medical staff to more quickly identify and select suitable specifications for patients. A scale is set at the rear of the puncture needle 1, and a propulsion member 11 is fixedly connected to the rear of the puncture needle 1. A short rod is fixedly connected to the left side of the propulsion member 11, and a soft Tube 12, the second connecting member 16 is fixedly connected to the lower side of the first fixing member 13, and the second connecting member 16 is rotatably connected to the first connecting member 15, so that the first fixing member 13 can rotate. The rotatable needle wing design can make the operation of medical staff more flexible, easy to adjust the angle, and convenient for puncture positioning, which can help medical staff to quickly and accurately find the blood vessel position. The present invention is made of medical grade raw materials, which not only has good biocompatibility, but also can reduce damage to the blood vessel wall, thereby improving the comfort of patients, and through precise manufacturing technology and unique design, it can enable medical staff to quickly and accurately perform puncture operations. The second connecting member 16 is connected to an obstruction component that can prevent the second connecting member 16 from rotating counterclockwise.

[0036] See also Figure 2-Figure 4, and also includes a stabilizing ring 14, which is fixedly connected to the lower side of the first connecting member 15. The upper part of the stabilizing ring 14 is made of hard plastic, and the left and right sides of the middle part of the stabilizing ring 14 are made of soft plastic. The left and right sides of the lower part of the stabilizing ring 14 are Velcro, so that the left and right sides can be adhered to each other, so that the stabilizing ring 14 can be fixedly connected to the patient's arm.

[0037] See also Figure 4 and Figure 5 The obstruction component includes two ratchets 17, which are fixedly connected to the left and right sides of the second connecting member 16. One side of the teeth of the ratchet 17 is an arc surface and the other side is a right-angle surface. The left and right sides of the first connecting member 15 are provided with protrusions, and a limiting member 18 is slidably connected to the lower side of the protrusion. The lower part of the limiting member 18 has one side as a right-angle surface and one side as an arc surface. Two first springs 19 are fixedly connected between the front and rear sides of the upper side of the limiting member 18 and the protrusion, and the limiting member 18 and the corresponding ratchet 17 are squeezed and fitted.

[0038] Before performing the dialysis operation, the medical staff needs to establish a temporary blood access on the patient's arm. At this time, the device can be used for operation. First, the device is connected to the dialysis device, and then the device is fixedly connected to the patient's arm through the Velcro at the bottom of the stabilizing ring 14. Then the medical staff manually rotates the first fixing member 13 clockwise, and the first fixing member 13 drives the puncture needle 1 to rotate clockwise, and the puncture needle 1 drives the propulsion member 11 to rotate clockwise, and the first fixing member 13 drives the second connecting member 16 to rotate clockwise, and the second connecting member 16 drives the ratchet 17 to rotate clockwise. When the ratchet 17 rotates clockwise, the arc surface of the ratchet 17 will contact and squeeze the limiting member 18, and the limiting member 18 is squeezed to move upward, and the first spring 13 drives the second connecting member 16 to rotate clockwise. The spring 19 is compressed. When the limiting member 18 is disengaged from the bevel tooth, the first spring 19 is reset to drive the limiting member 18 to move downward and reset. When the first fixing member 13 is rotated to the appropriate insertion angle, the medical staff manually pushes the pushing member 11 forward, and the pushing member 11 drives the puncture needle 1 forward, so that the puncture needle 1 is inserted into the patient's blood vessel at the appropriate insertion angle, and then the dialysis operation can be performed. At the same time, during dialysis, because the limiting member 18 faces the right angle of the ratchet 17, the ratchet 17 will not rotate counterclockwise, so that the puncture needle 1 can always maintain the insertion angle. After the patient's dialysis is completed, the medical staff moves the pushing member 11 backward again, and the pushing member 11 drives the puncture needle 1 to move backward The puncture needle 1 is pulled out of the patient's blood vessel, and then the device is removed from the dialysis device, and finally the device is discarded and no longer reused. The above operation fixes the device to the patient's arm through the stabilizing ring 14, and then the first fixing member 13 is rotated clockwise, the first fixing member 13 drives the second connecting member 16 to rotate clockwise, the first fixing member 13 drives the puncture needle 1 and then drives the pushing member 11 to rotate clockwise, so that when the pushing member 11 drives the puncture needle 1 forward, the needle can be inserted at a suitable insertion angle, thereby avoiding the problem of incorrect insertion angle caused by the unstable hands of new medical staff. The present invention adopts a humanized design, in which the smooth puncture surface and tip design of the ultra-thin wall needle can effectively reduce the risk of patients. The rotatable needle wing design makes the operation more flexible, easy to adjust the angle, and convenient for puncture positioning, which can help doctors find the blood vessel position quickly and accurately. The needle wings of the present invention use different colors of markings and the needles use different models, which are helpful for medical staff to more quickly identify and select suitable specifications for patients. The catheter of the puncture needle of the present invention is made of soft and elastic PVC material to reduce the movement of the needle in the body. At the same time, the present invention is made of medical-grade raw materials, which not only has good biocompatibility, but also can reduce damage to the blood vessel wall, thereby improving the comfort of patients. Through precise manufacturing technology and unique design, the present invention can realize fast and accurate puncture operation.

[0039] Example 2: Based on Example 1, please refer to Figure 6-Figure 8 , and also includes a protection mechanism that can protect the needle and prevent the needle from curling. The protection mechanism includes a second fixing member 25, the second fixing member 25 is fixedly connected to the upper right side of the first fixing member 13, the left part of the second fixing member 25 is rotatably connected to the rotating member 2, the left part of the rear of the rotating member 2 is fixedly connected to a gear 22, and the front side of the first fixing member 13 is fixedly connected to a protective member 21. The protective member 21 and the rotating member 2 can be combined to wrap the puncture needle 1, so that the needle of the puncture needle 1 is kept in a sterile environment before piercing the patient's skin. The present invention is designed for disposable use to avoid cross infection. The propulsion member 11 is connected to a rotating component that allows the rotating member 2 to rotate.

[0040] See also Figure 6 The rotating assembly includes a first connecting rod 24, which is fixedly connected to the upper side of the propulsion member 11. A rack 23 is fixedly connected to the front side of the first connecting rod 24, and the gear 22 and the rack 23 are meshed with each other.

[0041] Because the puncture needle 1 needs to be inserted into the patient's blood vessel, it is necessary to protect the puncture needle 1 to prevent the needle tip of the puncture needle 1 from curling. If curling occurs, the puncture needle 1 cannot be used any further. Therefore, a protective mechanism is provided to prevent impurities in the air from adhering to the needle tip of the puncture needle 1, thereby playing an isolation role. The following is its working principle: when the medical staff pushes the propeller 11 forward and the propeller 11 drives the puncture needle 1 forward, the propeller 11 drives the first connecting rod 24 forward, and the first connecting rod 24 drives the rack 23 forward. The rack 23 engages with the gear 22, causing the gear 22 to rotate counterclockwise, and the gear 22 drives the rotating member 2 to rotate counterclockwise, exposing the puncture needle 1. The propeller 11 drives the puncture needle 1 forward, and the puncture needle 1 is inserted into the patient's blood vessel, and then the dialysis operation is performed. When the patient's dialysis is finished, the medical staff moves the propeller 11 backward again, and the propeller 11 drives the puncture needle 1 backward The puncture needle 1 is pulled out of the patient's blood vessel, and the pusher 11 drives the first connecting rod 24 and then drives the rack 23 to move backward. The rack 23 is meshed with the gear 22, so that the gear 22 drives the rotating member 2 to rotate clockwise and reset, and then the device is removed from the dialysis device, and finally the device is discarded and no longer reused. The above operation is combined by the protective member 21 and the rotating member 2, so that the puncture needle 1 can be protected to prevent the puncture needle 1 from rolling, and it can also prevent the impurities in the air from adhering to the needle head of the puncture needle 1, which plays an isolation and anti-fouling role. The pusher 11 drives the first connecting rod 24 and then drives the rack 23 to move forward, so that the gear 22 drives the rotating member 2 to rotate counterclockwise, and the puncture needle 1 is exposed and then the needle insertion operation is performed. At the same time, the present invention adopts a sterile and disposable design to avoid the risk of cross infection caused by repeated use, ensure the sterile state during each use, and thus ensure the safety of the patient.

[0042] See also Fig. 9 and Fig.10 , and also includes a stretching mechanism that can stretch the skin before needle insertion. The stretching mechanism includes two guide rods 32, which are slidably connected to the left and right sides of the first fixing member 13 respectively, and the sides of the guide rods 32 that are close to each other are provided with inclined surfaces at the rear, and the sides of the guide rods 32 that are away from each other are fixedly connected to the first fixing member 13 with a second spring 34, the front of the guide rods 32 are rotatably connected to the stabilizing rods 31, the lower side of the stabilizing rods 31 is provided with a rubber strip, and the first torsion spring 33 is fixedly connected between the stabilizing rod 31 and the guide rods 32.

[0043] See also Fig. 9 , and also includes two first sliding rods 3, which are fixedly connected to the left and right sides of the propulsion member 11, and the first sliding rods 3 are squeezed and matched with the rear inclined surfaces of the guide rods 32.

[0044] Because the skin condition of each patient is different, especially the skin of the elderly will have wrinkles, which will make it difficult to insert the needle. Therefore, before using the puncture needle 1 to insert the needle, the skin of the elderly needs to be stretched out first. Therefore, a stretching mechanism is provided. The following is its working principle: when the medical staff fixes the device to the patient's arm through the stabilizing ring 14, the stabilizing rod 31 will be close to the skin on the patient's arm, and the lower side of the stabilizing rod 31 is fixedly connected with a rubber strip, which can increase the friction between the stabilizing rod 31 and the skin. When people rotate the first fixing member 13 clockwise, The first fixing member 13 drives the guide rods 32 to rotate clockwise, and the first torsion springs 33 are twisted. When the medical staff pushes the propulsion member 11 forward, the propulsion member 11 drives the first sliding rods 3 to move forward, and the first sliding rods 3 squeeze the guide rods 32, so that the guide rods 32 move toward the side away from each other. The second springs 34 are compressed, and the guide rods 32 drive the stabilizing rods 31 to move toward the side away from each other. Because the stabilizing rods 31 are provided with rubber strips, the friction between the stabilizing rods 31 and the skin becomes larger, so that the stabilizing rods 31 move toward the side away from each other. The movement drives the wrinkled skin of the patient to open, and at the same time, under the tendency of the first torsion spring 33 to reset, the stabilizing rod 31 can be closely attached to the patient's skin, and then the needle is inserted, thereby reducing the difficulty of needle insertion. After the needle is inserted, the dialysis operation is performed. When the patient's dialysis is completed, the medical staff moves the pushing member 11 backward, and the pushing member 11 drives the puncture needle 1 to move backward and pull it out of the patient's blood vessel. The pushing member 11 drives the first sliding rod 3 to move backward, and the first sliding rod 3 no longer squeezes the guide rod 32. The second spring 34 resets and drives the guide rod 32 to move The sides that are closer to each other move to reset, and the guide rod 32 drives the stabilizing rod 31 to move toward the side that moves toward each other to reset. The above operation increases the friction between the stabilizing rod 31 and the patient's arm skin through the rubber strip set on the lower side of the stabilizing rod 31, and drives the first sliding rod 3 to move forward through the propulsion member 11. The first sliding rod 3 squeezes the guide rod 32, so that the guide rod 32 moves toward the side that moves away from each other. The guide rod 32 drives the stabilizing rod 31 to move toward the side that moves away from each other, so that the stabilizing rod 31 stretches the patient's wrinkled skin, thereby reducing the difficulty of needle insertion.

[0045] See also Figure 11-Figure 14, and also includes a positioning mechanism that can grasp the needle insertion depth. The positioning mechanism includes two limit plates 42, which are respectively fixedly connected to the upper left and right sides of the first fixing member 13, and a plurality of teeth are provided on the limit plates 42. A second connecting rod 41 is fixedly connected to the rear side of the lower part of the first fixing member 13, and the second connecting rod 41 is slidably connected to the propulsion member 11. A positioning member 4 is slidably connected to the rear of the puncture needle 1, and the positioning member 4 is slidably connected to the second connecting rod 41. Second sliding rods 43 are slidably connected to the left and right sides of the positioning member 4, and a third spring 44 is fixedly connected between the second sliding rod 43 and the positioning member 4. A limiting component that can limit the forward and backward movement of the propulsion member 11 is provided on the positioning member 4.

[0046] See also Fig.14 The limiting component includes a limiting member 46, which is rotatably connected to the left side of the positioning member 4. A slope is arranged at the rear of the limiting member 46. The limiting member 46 is squeezed and matched with a short rod arranged on the left side of the propulsion member 11. A second torsion spring 45 is fixedly connected between the limiting member 46 and the positioning member 4.

[0047] Some medical personnel may not be able to accurately determine the depth of the puncture needle 1 entering the skin because their hands are not very steady, which may result in failure to puncture the blood vessel or puncture the blood vessel. Therefore, a positioning mechanism is provided, and the following is its working principle: after the medical personnel rotate the first fixing member 13 to find the insertion angle, the medical personnel first determine the depth to which the puncture needle 1 needs to be inserted, and then manually lift the second sliding rod 43 upward, the third spring 44 is compressed, and then the positioning member 4 is moved, and the positioning member 4 is moved to the corresponding position according to the depth of the needle insertion and the scale on the puncture needle 1, and then the second sliding rod 43 is released, and the third spring 44 is reset to drive the second sliding rod 43 to move downward The second sliding rod 43 is reset, so that the second sliding rod 43 is squeezed and matched with the teeth on the corresponding limiting plate 42, thereby limiting the positioning member 4, and then the medical staff pushes the propulsion member 11 forward again, and the propulsion member 11 drives the puncture needle 1 to move forward. When the propulsion member 11 moves to the rear side of the positioning member 4, the propulsion member 11 will be limited by the positioning member 4, so that the propulsion member 11 cannot continue to move forward, so that the puncture needle 1 penetrates the specified depth, and the short rod on the left side of the propulsion member 11 squeezes the inclined surface at the rear of the limiting member 46, so that the limiting member 46 rotates clockwise, and the second torsion spring 45 is twisted. When the propulsion member 11 is disengaged from the inclined surface on the limiting member 46, the second torsion spring 45 is reset, so that the limiting member 46 The part 46 buckles the short rod on the left side of the pushing member 11, so that the pushing member 11 will not move backwards. At the same time, under the guiding action of the second connecting rod 41, the pushing member 11 will not rotate, and the puncture needle 1 will not rotate in the patient's blood vessel, thereby reducing the damage of the puncture needle 1 to the patient's blood vessel. Then the dialysis operation is performed. When the patient's dialysis is finished, the medical staff rotates the limiting member 46 clockwise, and the second torsion spring 45 is twisted, so that the limiting member 46 releases the lock on the pushing member 11, and the pushing member 11 moves backwards. When the pushing member 11 is separated from the limiting member 46, the medical staff releases the limiting member 46, and the second torsion spring 45 is reset to drive the limiting member 46 counterclockwise. The needle rotates to reset, and the pusher 11 drives the puncture needle 1 to move backward and be pulled out. During the above operation, the medical staff can move the positioning member 4 to the specified position, and the teeth on the limit plate 42 limit the second sliding rod 43, so that the position of the positioning member 4 is fixed, so that the distance that the pusher 11 drives the puncture needle 1 to move forward is determined, and the depth of the puncture needle 1 is determined, thereby avoiding the situation where the medical staff may have an uncertain insertion depth due to unstable hands. At the same time, under the limiting effect of the limiter 46 and the second connecting rod 41, the pusher 11 will not drive the puncture needle 1 to move back and forth and rotate, thereby reducing the damage of the puncture needle 1 to the patient's blood vessels.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An arteriovenous puncture needle, characterized in that: The invention comprises a first fixing member (13), a puncture needle (1) is slidably connected to the first fixing member (13), the puncture needle (1) is composed of a needle tube and a needle, a scale is arranged on the puncture needle (1), a propulsion member (11) is fixedly connected to the puncture needle (1), a short rod is fixedly connected to the propulsion member (11), a side of the puncture needle (1) close to the propulsion member (11) is connected to a hose (12), a second connecting member (16) is fixedly connected to the bottom surface of the first fixing member (13), the second connecting member (16) is rotatably connected to the first connecting member (15), and a blocking component capable of blocking the second connecting member (16) from rotating counterclockwise is connected to the second connecting member (16).

2. An arteriovenous puncture needle according to claim 1, characterized in that: It also includes a stabilizing ring (14), which is fixedly connected to the bottom of the first connecting member (15), and the stabilizing ring (14) is made of hard plastic, soft plastic and Velcro.

3. An arteriovenous puncture needle according to claim 2, characterized in that: The obstruction assembly comprises a plurality of ratchets (17), the ratchets (17) being fixedly connected to the second connecting member (16), one tooth side of the ratchet (17) being an arc surface and the other side being a right angle surface, a protrusion being provided on the side of the first connecting member (15) close to the ratchet (17), the protrusion being slidably connected to a limiting member (18), one side of the limiting member (18) close to the ratchet (17) being a right angle surface and the other side being an arc surface, a plurality of first springs (19) being fixedly connected between the limiting member (18) and the protrusion, the limiting member (18) being extrusion-fitted with the corresponding ratchet (17).

4. An arteriovenous puncture needle according to claim 3, characterized in that: The invention also comprises a protective mechanism capable of protecting the needle and preventing the needle from curling, the protective mechanism comprising a second fixing member (25), the second fixing member (25) being fixedly connected to the first fixing member (13), a rotating member (2) being rotatably connected to the second fixing member (25), a gear (22) being fixedly connected to a side of the rotating member (2) close to the propulsion member (11), a protective member (21) being fixedly connected to a side of the first fixing member (13) away from the propulsion member (11), and a rotating assembly capable of rotating the rotating member (2) being connected to the propulsion member (11).

5. An arteriovenous puncture needle according to claim 4, characterized in that: The rotating assembly comprises a first connecting rod (24), the first connecting rod (24) is fixedly connected to the top of the propulsion member (11), a side of the first connecting rod (24) away from the propulsion member (11) is fixedly connected to a rack (23), and the gear (22) and the rack (23) are meshed with each other.

6. An arteriovenous puncture needle according to claim 5, characterized in that: The invention also comprises a stretching mechanism capable of stretching the skin before needle insertion, the stretching mechanism comprising a plurality of guide rods (32), the guide rods (32) being slidably connected to the first fixing member (13), the side of the guide rods (32) close to the propulsion member (11) and the side close to each other being provided with an inclined surface, the side of the guide rods (32) away from each other being fixedly connected to the first fixing member (13) with a second spring (34), the side of the guide rods (32) away from the propulsion member (11) being rotatably connected to a stabilizing rod (31), and a first torsion spring (33) being fixedly connected between the stabilizing rod (31) and the guide rods (32).

7. An arteriovenous puncture needle according to claim 6, characterized in that: It also includes a first sliding rod (3) fixedly connected to one side of the propulsion member (11) close to the guide rod (32), and the first sliding rod (3) is extruded and matched with the inclined surface arranged on the guide rod (32).

8. An arteriovenous puncture needle according to claim 7, characterized in that: The invention also comprises a positioning mechanism capable of controlling the needle insertion depth, wherein the positioning mechanism comprises a plurality of limit plates (42), the limit plates (42) being fixedly connected to the first fixing member (13), the limit plates (42) being provided with a plurality of teeth, the first fixing member (13) being fixedly connected with a second connecting rod (41), the second connecting rod (41) being slidably connected to the propulsion member (11), the puncture needle (1) being slidably connected with a positioning member (4), the positioning member (4) being slidably connected to the second connecting rod (41), the positioning member (4) being slidably connected with a plurality of second sliding rods (43), a third spring (44) being fixedly connected between the second sliding rod (43) and the positioning member (4), and a limiting component capable of limiting the forward and backward movement of the propulsion member (11) being provided on the positioning member (4).

9. An arteriovenous puncture needle according to claim 8, characterized in that: The limiting assembly comprises a limiting member (46), the limiting member (46) is rotatably connected to the positioning member (4), an inclined surface is arranged on the limiting member (46), the limiting member (46) is extruded and matched with a short rod arranged on the propulsion member (11), and a second torsion spring (45) is fixedly connected between the limiting member (46) and the positioning member (4).

10. An arteriovenous puncture needle according to claim 9, characterized in that: The bottom of the stabilizing rod (31) is also provided with a rubber strip.

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