Arteriovenous puncture needle

Abstract

The present invention provides an arteriovenous puncture needle, which relates to the technical field of medical devices, and includes a first fixing member, a puncture needle slidably connected to the first fixing member, a scale provided on the puncture needle, a propeller fixedly connected to the puncture needle, a short rod fixedly connected to the propeller, a hose connected to the side of the puncture needle close to the propeller, a second connecting member fixedly connected to the bottom surface of the first fixing member, and the second connecting member rotatably connected to the first connecting member. The present invention fixes the device to the patient's arm through a stabilizing ring, and then by rotating 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 propeller clockwise to rotate. When the propeller drives the puncture needle forward, the needle can be inserted at a suitable insertion angle, avoiding the problem of incorrect insertion angle caused by the unstable hands of new medical staff. 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.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, 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, which requires the use of 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. Then, the arteriovenous puncture needle is fixed to the patient's arm with tape to prevent the arteriovenous puncture needle from shaking, and then the dialysis operation is performed. 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, resulting in low accuracy. The wrong needle insertion angle will cause great pain to the patient and is likely to 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 to overcome the shortcomings of inexperienced medical personnel not being able to grasp the correct needle insertion angle and having low accuracy.

[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 consists of a needle tube and a needle, a scale is provided 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 is made of hard plastic, soft plastic and Velcro.

[0007] Furthermore, the obstruction assembly includes several 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. The side of the limiting member close to the ratchet is a right-angle surface on one side and an arc surface on the other side. Several first springs are fixedly connected between the limiting member and the protrusion, and the limiting member is squeezed into fit 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, which 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 the side of the rotating member close to the propulsion member, and a protective member is fixedly connected to the side of the first fixing member away from the propulsion member. 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, which is fixedly connected to the top of the propulsion member. 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 the needle is inserted. The stretching mechanism includes a number of guide rods, which are slidably connected to the first fixed part. The side of the guide rod close to the propulsion member and the side close to each other are provided with an inclined surface, and the side of the guide rod away from each other is fixedly connected to the first fixed part with a second spring, and the side of the guide rod 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 fitted with an inclined surface provided on the guide rod.

[0012] Furthermore, it also includes a positioning mechanism that can grasp the needle insertion depth. The positioning mechanism includes several limit plates, which are fixedly connected to the first fixing member. The limit plates are provided with multiple teeth. The first fixing member is fixedly connected to a second connecting rod, and the second connecting rod is slidably connected to the propulsion member. The puncture needle is slidably connected to a positioning member, the positioning member is slidably connected to the second connecting rod, and the positioning member is slidably connected to several 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 together 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 stabilizer 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. 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, convenient for puncture positioning, and 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 appropriate 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 member and a rotating member to protect the puncture needle, prevent the puncture needle from curling, and prevent impurities in the air from adhering to the needle tip 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 during each use, and thus ensuring the safety of the patient.

[0017] 3. The present invention increases the friction between the stabilizing rod and the skin of the patient's arm by providing a rubber strip 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, so that the stabilizing rod stretches the wrinkled skin of the patient, thereby reducing the difficulty of needle insertion.

[0018] 4. In the present invention, medical personnel can move the positioning member to a specified position, and the teeth on the limit plate restrict 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 personnel may have an uncertain insertion depth due to unstable hands. At the same time, under the restrictive action 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, propulsion member, 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, puncture needle and propulsion member 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, protective member, rack and other components of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the rotating part, the protective part and the second fixing part 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] Figure 9 It is a schematic diagram of the three-dimensional structure of the expansion mechanism of the present invention.

[0028] Figure 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] Figure 11 It is a schematic diagram of the three-dimensional structure of the positioning mechanism of the present invention.

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

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

[0032] Figure 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-protective 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 clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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 part 13, the first fixing part 13 is a needle wing, and the puncture needle 1 is slidably connected to the first fixing part 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 helps medical staff to identify and select the appropriate specifications for the patient more quickly. 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. The rear of the puncture needle 1 is connected to a soft Tube 12, the lower side of the first fixing member 13 is fixedly connected to the second connecting member 16, 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 medical staff's operation more flexible, easy to adjust the angle, and convenient for puncture positioning, which can help medical staff find the blood vessel position quickly and accurately. 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, 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, 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 adhere 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-angled surface. The left and right sides of the first connecting member 15 are provided with protrusions, and the lower side of the protrusion is slidably connected to a limiting member 18. The lower part of the limiting member 18 has one side as a right-angled 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. The limiting member 18 and the corresponding ratchet 17 are squeezed together.

[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 fixed 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 will be squeezed to move upward, and the first spring 13 will rotate clockwise. The spring 19 is compressed. When the limiting member 18 is disengaged from the bevel gear, 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 needle insertion angle, the medical staff manually pushes the propulsion member 11 forward, and the propulsion 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 needle insertion angle, and then the dialysis operation can be performed. At the same time, during dialysis, because the limiting member 18 is at a right angle to the right-angled surface of the ratchet 17, the ratchet 17 will not rotate counterclockwise, thereby enabling the puncture needle 1 to always maintain the needle insertion angle. When the patient's dialysis is completed, the medical staff moves the propulsion member 11 backward again, and the propulsion member 11 drives the puncture needle 1 to move backward The puncture needle 1 is pulled out from 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, and the first fixing member 13 drives the second connecting member 16 to rotate clockwise, and the first fixing member 13 drives the puncture needle 1 and then drives the propulsion member 11 to rotate clockwise, so that when the propulsion 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 ultra-thin wall needle has a smooth puncture surface and a tip design, which 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 help medical staff to more quickly identify and select appropriate 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. And through precise manufacturing technology and unique design, the present invention can achieve fast and accurate puncture operation.

[0039] Example 2: Based on Example 1, please refer to Figure 6-Figure 8 , 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, which 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 side of the rear of the rotating member 2 is fixedly connected to a gear 22. 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 tip 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, thereby avoiding cross infection. The propulsion member 11 is connected to a rotating assembly that can rotate the rotating member 2.

[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. The front side of the first connecting rod 24 is fixedly connected to a rack 23, and the gear 22 and the rack 23 are engaged 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 anymore. Therefore, a protective mechanism is provided. It can also 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 pusher 11 forward and the pusher 11 drives the puncture needle 1 forward, the pusher 11 will drive 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 pusher 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 pusher 11 backward again, and the pusher 11 drives the puncture needle 1 backward The first connecting rod 24 is driven by the pusher 11, and the rack 23 is driven 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 to reset. Then the device is removed from the dialysis device and finally the device is discarded and no longer reused. The above operation is combined with 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 curling and to prevent impurities in the air from adhering to the needle tip of the puncture needle 1, thereby playing an isolation and anti-fouling role. The first connecting rod 24 is driven by the pusher 11, and the rack 23 is driven to move forward, so that the gear 22 drives the rotating member 2 to rotate counterclockwise, 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 reuse, ensure the sterile state during each use, and thus ensure the safety of the patient.

[0042] See also Figure 9 and Figure 10 , and also includes a stretching mechanism that can stretch the skin before the needle is inserted. 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 an inclined surface is provided on the side close to each other at the rear of the guide rods 32. A second spring 34 is fixedly connected between the side away from each other and the first fixing member 13, and the front of the guide rods 32 is rotatably connected to the stabilizing rod 31. A rubber strip is provided on the lower side of the stabilizing rod 31, and a first torsion spring 33 is fixedly connected between the stabilizing rod 31 and the guide rod 32.

[0043] See also Figure 9 , also includes two first sliding rods 3, the first sliding rods 3 are fixedly connected to the left and right sides of the propulsion member 11, and the first sliding rods 3 are squeezed and fitted 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 in close contact with the skin on the patient's arm. 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 rod 3 to move forward, and the first sliding rod 3 squeezes the guide rod 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 greater, thereby causing the stabilizing rods 31 to 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 toward 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, and 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 11-14, also includes a positioning mechanism that can grasp the needle insertion depth, the positioning mechanism includes two limit plates 42, the limit plates 42 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. The lower rear side of the first fixing member 13 is fixedly connected to the second connecting rod 41, and the second connecting rod 41 is slidably connected to the propulsion member 11. The rear of the puncture needle 1 is slidably connected to the positioning member 4, and the positioning member 4 is slidably connected to the second connecting rod 41. The left and right sides of the positioning member 4 are slidably connected to the second sliding rod 43, and the second sliding rod 43 and the positioning member 4 are fixedly connected. A third spring 44 is fixedly connected. The positioning member 4 is provided with a limiting component that can limit the forward and backward movement of the propulsion member 11.

[0046] See also Figure 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 provided at the rear of the limiting member 46. The limiting member 46 is squeezed and fitted with a short rod provided 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 staff may not be able to grasp the depth of the puncture needle 1 into 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. The following is its working principle: After the medical staff rotates the first fixing member 13 to find the needle insertion angle, the medical staff first determines the depth to which the puncture needle 1 needs to be inserted, and then manually lifts the second sliding rod 43 upward, the third spring 44 is compressed, and then moves the positioning member 4. According to the depth of the needle insertion and the scale on the puncture needle 1, the positioning member 4 is moved to the corresponding position, 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 When the pusher 11 is moved to the rear side of the positioning member 4, the pusher 11 will be restricted by the positioning member 4, so that the pusher 11 cannot move forward any further, so that the puncture needle 1 penetrates the specified depth. The short rod on the left side of the pusher 11 squeezes the inclined surface at the rear of the limiting member 46, causing the limiting member 46 to rotate clockwise, and the second torsion spring 45 is twisted. When the pusher 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 is not moved forward. The part 46 buckles the short rod on the left side of the propulsion member 11, so that the propulsion member 11 will not move backward. At the same time, under the guiding action of the second connecting rod 41, the propulsion 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 completed, 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 propulsion member 11, and the propulsion member 11 moves backward. When the propulsion member 11 is separated from the limiting member 46, the medical staff releases the limiting member 46, and the second torsion spring 45 resets and drives 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, 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, 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 principles of the present invention. These improvements and modifications should also be regarded as within 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 set 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 hose (12) is connected to the side of the puncture needle (1) close to the propulsion member (11), 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 an obstruction component capable of obstructing the second connecting member (16) from rotating counterclockwise is connected to the second connecting member (16); and a stabilizing ring (14 ), the stabilizing ring (14) is fixedly connected to the bottom of the first connecting member (15); the obstruction assembly includes a plurality of ratchets (17), the ratchet (17) is fixedly connected to the second connecting member (16), the teeth of the ratchet (17) are one arc surface and one right angle surface, the first connecting member (15) is provided with a protrusion on the side close to the ratchet (17), and the protrusion is slidably connected to a limiting member (18), the side of the limiting member (18) close to the ratchet (17) is one right angle surface and the other arc surface, a plurality of first springs (19) are fixedly connected between the limiting member (18) and the protrusion, and the limiting member (18) is squeezed and matched with the corresponding ratchet (17); it also includes a device that can protect the needle and prevent the needle from rolling The blade protection mechanism includes a second fixing member (25), the second fixing member (25) is fixedly connected to the first fixing member (13), a rotating member (2) is rotatably connected to the second fixing member (25), a gear (22) is fixedly connected to the side of the rotating member (2) close to the propulsion member (11), a protective member (21) is fixedly connected to the side of the first fixing member (13) away from the propulsion member (11), and the propulsion member (11) is connected to a rotating assembly capable of rotating the rotating member (2); the rotating assembly includes a first connecting rod (24), the first connecting rod (24) is fixedly connected to the top of the propulsion member (11), and the first connecting rod (24) is fixedly connected to the side away from the propulsion member (11). A rack (23) is fixedly connected, and the gear (22) and the rack (23) are meshed with each other; it also includes a stretching mechanism that can stretch the skin before the needle is inserted, and the stretching mechanism includes a plurality of guide rods (32), the guide rods (32) are slidably connected to the first fixing member (13), and the guide rods (32) are provided with an inclined surface on the side close to the propulsion member (11). A second spring (34) is fixedly connected between the side of the guide rods (32) away from the first fixing member (13), and a stabilizing rod (31) is rotatably connected to the side of the guide rods (32) away from the propulsion member (11), and a first torsion spring (33) is fixedly connected between the stabilizing rod (31) and the guide rods (32).

2. An arteriovenous puncture needle according to claim 1, characterized in that: The first sliding rod (3) is 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 fitted with an inclined surface provided on the guide rod (32).

3. The arteriovenous puncture needle according to claim 2, characterized in that: The invention also includes a positioning mechanism capable of controlling the needle insertion depth, wherein the positioning mechanism includes a plurality of limit plates (42), the limit plates (42) are fixedly connected to the first fixing member (13), the limit plates (42) are provided with a plurality of teeth, the first fixing member (13) is fixedly connected to a second connecting rod (41), the second connecting rod (41) is slidably connected to the propulsion member (11), the puncture needle (1) is slidably connected to a positioning member (4), the positioning member (4) is slidably connected to the second connecting rod (41), the positioning member (4) is slidably connected to a plurality of second sliding rods (43), a third spring (44) is 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) is provided on the positioning member (4).

4. The arteriovenous puncture needle according to claim 3, characterized in that: The limiting assembly includes a limiting member (46), the limiting member (46) is rotatably connected to the positioning member (4), an inclined surface is provided on the limiting member (46), the limiting member (46) is squeezed and matched with a short rod provided on the propulsion member (11), and a second torsion spring (45) is fixedly connected between the limiting member (46) and the positioning member (4).

5. The arteriovenous puncture needle according to claim 4, characterized in that: The bottom of the stabilizing rod (31) is also provided with a rubber strip.

Images