A medical blood collection needle

Abstract

The present invention discloses a medical blood collection needle, which includes a needle head and a connecting tube. It further includes a receiving cavity located inside the connecting tube and communicating with the outside at the right end, a connecting seat, a spring, a first drainage hole, and a second drainage hole. The first drainage hole and the second drainage hole are communicated, and a blocking mechanism is provided between the first drainage hole and the second drainage hole. The connecting seat is connected to the connecting tube through a snap mechanism. With the setting of the connecting seat and the snap mechanism in the present invention, it is convenient to fix the needle head to the receiving cavity. By inserting the blood collection tube into the connecting seat of the receiving cavity, blood collection can be carried out. It is convenient to replace the blood sample tube. Only one hand is needed to insert the blood sample tube into the connecting seat to draw blood. After the blood collection is completed, the blood sample tube can be pulled out with one hand, avoiding the phenomenon of needle displacement caused by inserting the blood sample tube with both hands. At the same time, the labor intensity of the nursing staff is reduced. After blood collection, the needle head is retracted into the receiving cavity under the action of the snap mechanism and the spring, avoiding the phenomenon of cross-infection caused by the needle head stabbing people.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a medical blood collection needle. Background Art

[0002] With the development of society, especially the progress of science and technology, the rapid development of social productivity has been greatly promoted; while people enjoy the rich material life brought by social progress, they put forward higher and higher service requirements for the medical and health service industry; and today in the fast-paced economic and social development, efficient and fast service has become the main theme of social development.

[0003] In conventional medical services, blood sample collection and testing is a relatively common behavior; the blood collection and testing technology is currently quite mature, but it still cannot achieve the purpose of obtaining a conclusion without collecting blood from patients, and the initial process of testing still needs to be completed by a blood collection needle and a blood collection tube. Therefore, the blood collection needle is one of the medical device products with the largest global sales. However, when the existing blood collection needle is used to collect blood from patients, due to the large number of patients being collected by nursing staff, especially for the elderly and those with inconvenient limbs, the nursing staff needs to continuously change the blood sample tube while pressing the needle wing. Since one end of the blood collection needle is connected to the blood sample tube through a flexible tube, when changing the blood sample tube, two hands are required to operate, and the little finger of the other hand also needs to press the needle wing. At this time, the blood collection needle is prone to needle displacement, and hundreds of thousands of cases of human injury accidents caused by improper operation of nursing staff occur every year. Clinically, due to the high frequency of using blood collection needles by nursing staff, it is inevitable that they will accidentally prick themselves. Due to the complex conditions of the blood donors, if the collected blood contains highly infectious and difficult-to-cure pathogens such as AIDS and hepatitis B, it will pose a great safety threat to the safety of nursing staff.

[0004] Therefore, providing a medical blood collection needle that is convenient for changing blood sample tubes and has high safety has become a problem worthy of research. Summary of the Invention

[0005] The purpose of the present invention is to provide a medical blood collection needle that is convenient for changing blood sample tubes and has high safety.

[0006] The purpose of the present invention is achieved as follows:

[0007] A medical blood collection needle, comprising a needle head, a connecting tube fixedly connected to the needle head for connecting a blood collection tube, further comprising a receiving cavity located inside the connecting tube and communicating with the outside at the right end, a connecting seat located inside the receiving cavity and fixedly connected to the needle head, a spring fixedly connected to the left side surface of the connecting seat and the left side surface of the receiving cavity and sleeved on the needle head, a first liquid discharge hole located on the left side surface of the connecting seat and fixedly connected to the outer surface of the right side of the needle head, a second liquid discharge hole located on the right side surface of the connecting seat and connected to the blood sample tube, a limiting mechanism connected to the receiving cavity and used to block the connecting seat from moving to the right, the first liquid discharge hole and the second liquid discharge hole are communicated, a blocking mechanism for blocking the blood from flowing out is provided between the first liquid discharge hole and the second liquid discharge hole, the connecting seat is connected to the connecting tube through a buckle mechanism, and the buckle mechanism comprises a first buckle body located on the front side surface of the connecting seat and a second buckle body located on the rear side surface of the connecting seat.

[0008] The first buckle body comprises a first receiving groove located on the front side surface of the connecting seat and opening forward, a first spring fixedly connected to the rear side surface of the first receiving groove, a first connecting block fixedly connected to the front end of the first spring, a first locking block fixedly connected to the front side surface of the first connecting block, a first locking hole located on the front side surface of the connecting tube and cooperating with the first locking block, the first locking hole communicates the receiving cavity with the outside, and the size of the first connecting block is larger than the size of the first locking hole.

[0009] A first inclined surface is provided at the front end of the right side surface of the first locking block, a second inclined surface is provided at the rear end of the right side surface of the first locking hole, and the first inclined surface and the second inclined surface are parallel.

[0010] The second buckle body comprises a second receiving groove located on the rear side surface of the connecting seat and opening backward, a second spring fixedly connected to the front side surface of the second receiving groove, a second connecting block fixedly connected to the rear end of the second spring, a second locking block fixedly connected to the rear side surface of the second connecting block, a second locking hole located on the rear side surface of the connecting tube and cooperating with the second locking block, the second locking hole communicates the receiving cavity with the outside, and the size of the second connecting block is larger than the size of the second locking hole.

[0011] A third inclined surface is provided at the rear end of the right side surface of the second locking block, a fourth inclined surface is provided at the front end of the right side surface of the second locking hole, and the third inclined surface and the fourth inclined surface are parallel.

[0012] A first through hole for the needle head to pass through is provided on the left side surface of the receiving cavity, and the limiting mechanism comprises an annular baffle fixedly connected to the surface of the receiving cavity, and the central axis of the annular baffle coincides with the central axis of the receiving cavity.

[0013] The connecting seat is made of medical rubber material.

[0014] The diameter of the first liquid discharge hole is larger than the diameter of the second liquid discharge hole.

[0015] The plugging mechanism includes a first plugging plate movably connected to the front side of the first liquid discharge hole through a first connecting mechanism, and a second plugging plate located behind the first plugging plate and movably connected to the front side of the first liquid discharge hole through a second connecting mechanism. The first plugging plate rotates around the first connecting mechanism in the horizontal direction, and the second plugging plate rotates around the second connecting mechanism on the horizontal plane. The left side surface of the first plugging plate is fixedly connected to the front side surface of the first liquid discharge hole through a third spring, and the left side surface of the second plugging plate is fixedly connected to the rear side surface of the second liquid discharge hole through a fourth spring. The right side surface of the first plugging plate is in sealing contact with the right side surface of the first liquid discharge hole, the right side surface of the second plugging plate is in sealing contact with the right side surface of the first liquid discharge hole, the rear side surface of the first plugging plate is in sealing contact with the front side surface of the second plugging plate, and the first plugging plate and the second plugging plate jointly plug the second liquid discharge hole.

[0016] The first connecting mechanism includes a first connecting plate fixedly connected to the front side surface of the first plugging plate, a second connecting plate located below the first connecting plate and fixedly connected to the front side surface of the first liquid discharge hole, and a first pin shaft passing through the first connecting plate and the second connecting plate. The first connecting plate and the second connecting plate rotate around the first pin shaft. The second connecting mechanism includes a third connecting plate fixedly connected to the rear side surface of the second plugging plate, a fourth connecting plate located below the third connecting plate and fixedly connected to the rear side surface of the first liquid discharge hole, and a second pin shaft passing through the third connecting plate and the fourth connecting plate. The third connecting plate and the fourth connecting plate rotate around the second pin shaft.

[0017] Positive and beneficial effects: The connection seat and the buckle mechanism of the present invention are arranged to facilitate the fixation of the needle head to the accommodating cavity. The blood collection tube can be inserted into the connection seat of the accommodating cavity for blood collection, and it is convenient to exchange the blood sample tube. Only one hand is needed to insert the blood sample tube into the connection seat for blood extraction. After the blood collection is completed, the blood sample tube can be pulled out with one hand, avoiding the phenomenon of needle displacement caused by inserting the blood sample tube with both hands. At the same time, the labor intensity of the nursing staff is reduced. After blood collection, the needle head is retracted into the accommodating cavity through the action of the buckle mechanism and the spring, avoiding the phenomenon of cross-infection caused by the needle head stabbing people, and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a sectional view taken along the line A-A;

[0020] Figure 3 is a schematic structural diagram of the connection seat of the present invention;

[0021] Figure 4 is an enlarged schematic structural diagram of part B;

[0022] Figure 5 is a sectional view taken along the line C-C;

[0023] In the figure: needle 1, connecting tube 2, accommodating cavity 3, connecting seat 4, spring 5, first buckle body 6, second buckle body 7, first through hole 8, limiting mechanism 9, first card hole 10, second card hole 11, first drainage hole 12, second drainage hole 13, first accommodating groove 14, first spring 15, first connecting block 16, first card block 17, second accommodating groove 18, second spring 19, second connecting hole 20, second card hole 21, first plugging plate 22, second plugging plate 23, first connecting mechanism 24, second connecting mechanism 25, third spring 26, fourth spring 27, first connecting plate 28, second connecting plate 29, first pin shaft 30, third connecting plate 31, fourth connecting plate 32, second pin shaft 33. Detailed implementation mode

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Embodiment 1

[0026] Such as Figure 1 And Figure 2As shown, a medical blood collection needle comprises a needle 1, a connecting tube 2 fixedly connected to the needle 1 for connecting a blood sampling tube, a accommodating chamber 3 located in the connecting tube 2 and the right end of which is connected to the outside, a connecting seat 4 located in the accommodating chamber 3 and fixedly connected to the needle, a spring 5 fixedly connected to the left side surface of the connecting seat 4 and the left side surface of the accommodating chamber 3 and sleeved on the needle 1, a first drainage hole 12 located on the left side surface of the connecting seat 4 and fixedly connected to the right outer surface of the needle 1, a second drainage hole 13 located on the right side surface of the connecting seat 4 and connected to the blood sample tube, and a limiting mechanism 9 connected to the accommodating chamber 3 and used to prevent the connecting seat 4 from moving rightward. The connecting seat 4 is made of medical rubber material, the first drainage hole 12 and the second drainage hole 13 are connected, the inner side surface of the first drainage tube 12 is fixed to the outer side surface of the needle 1 by gluing and fixing with a medical adhesive, and the first drainage hole 12 and the second drainage hole 13 are connected. A blocking mechanism is provided between the drainage holes 13 to block the outflow of blood. When the blood sample tube is pulled out, the blocking mechanism blocks the second drainage hole 13 to prevent the outflow of blood. When the blood sample tube is inserted into the second drainage hole 13, the left end of the blood sample tube opens the blocking mechanism to allow blood to enter the blood sample tube. The connecting seat 4 is connected to the connecting tube 2 through a snap mechanism. The left side surface of the accommodating chamber 3 is provided with a first through hole 8 for the needle 1 to pass through. The limiting mechanism 8 includes an annular baffle fixedly connected to the surface of the accommodating chamber 3 by a medical adhesive. The central axis of the annular baffle coincides with the central axis of the accommodating chamber 3. When the snap mechanism is opened, that is, the spring 5 pushes the connecting seat 4 to move rightward, the connecting seat 4 drives the needle 1 to move rightward. When the left end of the needle 1 is located in the first through hole 8, the right end of the connecting seat 4 contacts the left end of the annular baffle to block the connecting seat 4 from continuing to move rightward. The side of the connecting seat 4 is in contact with the accommodating chamber 3, and the outer side of the connecting seat 4 is coated with medical lubricating oil. When the spring 5 pushes the connecting seat 4 to move to the left, the friction between the connecting seat 4 and the accommodating chamber 3 is reduced. The buckle mechanism includes a first buckle body located on the front side of the connecting seat 4 and a second buckle body located on the rear side of the connecting seat. Since the connecting seat 4 is fixedly connected to the connecting tube 2 through the buckle mechanism, it is convenient to directly insert the blood sample tube into the second drainage hole 13. After the sampling is completed, one hand holds the connecting tube 2 and the other hand pulls out the blood sample tube to avoid leakage. The needle slip phenomenon occurs and the workload of the nursing staff is reduced. After the blood collection is completed, the needle is pulled out of the skin, and then the buckle mechanism is opened to release the fixation of the connecting seat 4 and the connecting tube 2. The spring 5 pushes the connecting seat 4 to move to the right, and the connecting seat 4 drives the needle 1 to move to the right. When the left end of the needle 1 is located in the first through hole 8, the right side surface of the connecting seat 4 contacts the left side surface of the annular baffle 9 to prevent the connecting seat 4 from continuing to move to the right, thereby preventing the needle from stabbing the nursing staff or other personnel, eliminating the risk of cross infection, and having high safety.

[0027] like Figure 3As shown in the figure, the first snap body includes a first receiving groove 14 located on the front side of the connecting seat 4 and opening forward, a first spring 15 fixedly connected to the rear side of the first receiving groove 14, a first connecting block 16 fixedly connected to the front end of the first spring 15, a first snap block 17 fixedly connected to the front side of the first connecting block 16 by a medical adhesive, a first snap hole 10 located on the front side of the connecting tube 2 and cooperating with the first snap block 17. The first snap hole 10 communicates the receiving cavity 3 with the outside. The size of the first connecting block 16 is larger than the size of the first snap hole 10, preventing the first connecting block 16 from being pushed out of the first snap hole 10 by the first spring 15 and entering the outside, thus making the snap connection between the connecting seat 4 and the connecting tube 2 insecure and affecting the stability of the needle 1. The two ends of the first spring 15 are fixedly connected to the rear side of the first receiving groove 14 and the rear side of the first connecting hole 16 by a medical adhesive. The front end of the right side of the first snap block 17 of the first connecting hole 16 is provided with a first inclined surface, and the rear end of the right side of the first snap hole 10 is provided with a second inclined surface. The first inclined surface and the second inclined surface are parallel, facilitating the quick separation of the first snap block 17 from the first snap hole 10. When it is necessary to retract the left end of the needle 1 into the first through hole 8, press the first snap block 17 forward, then the first snap block 17 separates from the first snap hole 10, and the spring 5 pushes the connecting seat 4 to move to the right. The connecting seat 4 drives the needle 1 to move to the right, so that the left end of the needle 1 is located within the first through hole 8.

[0028] As Figure 3 shown in the figure, the second snap body includes a second receiving groove 18 located on the rear side of the connecting seat 4 and opening backward, a second spring 19 fixedly connected to the front side of the second receiving groove 18, a second connecting block 20 fixedly connected to the rear end of the second spring 19, a second snap block 21 fixedly connected to the rear side of the second connecting block 20 by a medical adhesive, a second snap hole 11 located on the rear side of the connecting tube 2 and cooperating with the second snap block 21. The two ends of the second spring 19 are fixedly connected to the front side of the second receiving groove 18 and the front side of the second connecting hole 20 by a medical adhesive respectively. The second snap hole 11 communicates the receiving cavity 3 with the outside. The size of the second connecting block 20 is larger than the size of the second snap hole 11, preventing the second spring 19 from pushing the second connecting block 20 out of the second hole 11 and entering the outside, thus making the snap connection between the connecting seat 4 and the connecting tube 2 insecure and affecting the stability of the needle 1. The rear end of the right side of the second snap block 21 is provided with a third inclined surface, and the front end of the right side of the second snap hole 11 is provided with a fourth inclined surface. The third inclined surface and the fourth inclined surface are parallel, facilitating the quick separation of the second snap block 21 from the second snap hole 11. When it is necessary to retract the left end of the needle 1 into the first through hole 8, press the second snap block 21 backward, then the second snap block 21 separates from the snap hole 11, and the spring 5 pushes the connecting seat 4 to move to the right. The connecting seat 4 drives the needle 1 to move to the right, so that the left end of the needle 1 is located within the first through hole 8.

[0029] When it is necessary to retract the left end of the needle 1 into the first through hole 8, press the first clamping block 17 forward, then the first clamping block 17 is separated from the first clamping hole 10. At the same time, press the second clamping block 21 backward, then the second clamping block 21 is separated from the clamping hole 11. Then the spring 5 pushes the connecting seat 4 to move rightward, and the connecting seat 4 drives the needle 1 to move rightward, so that the left end of the needle 1 is located in the first through hole 8. The operation is simple and the safety is high.

[0030] Embodiment 2

[0031] As Figure 1 And Figure 2As shown, a medical blood collection needle comprises a needle 1, a connecting tube 2 fixedly connected to the needle 1 for connecting a blood sampling tube, a accommodating chamber 3 located in the connecting tube 2 and the right end of which is connected to the outside, a connecting seat 4 located in the accommodating chamber 3 and fixedly connected to the needle, a spring 5 fixedly connected to the left side surface of the connecting seat 4 and the left side surface of the accommodating chamber 3 and sleeved on the needle 1, a first drainage hole 12 located on the left side surface of the connecting seat 4 and fixedly connected to the right outer surface of the needle 1, a second drainage hole 13 located on the right side surface of the connecting seat 4 and connected to the blood sample tube, and a limiting mechanism 9 connected to the accommodating chamber 3 and used to prevent the connecting seat 4 from moving rightward. The connecting seat 4 is made of medical rubber material, the first drainage hole 12 and the second drainage hole 13 are connected, the inner side surface of the first drainage tube 12 is fixed to the outer side surface of the needle 1 by gluing and fixing with a medical adhesive, and the first drainage hole 12 and the second drainage hole 13 are connected. A blocking mechanism is provided between the drainage holes 13 to block the outflow of blood. When the blood sample tube is pulled out, the blocking mechanism blocks the second drainage hole 13 to prevent the outflow of blood. When the blood sample tube is inserted into the second drainage hole 13, the left end of the blood sample tube opens the blocking mechanism to allow blood to enter the blood sample tube. The connecting seat 4 is connected to the connecting tube 2 through a snap mechanism. The left side surface of the accommodating chamber 3 is provided with a first through hole 8 for the needle 1 to pass through. The limiting mechanism 8 includes an annular baffle fixedly connected to the surface of the accommodating chamber 3 by a medical adhesive. The central axis of the annular baffle coincides with the central axis of the accommodating chamber 3. When the snap mechanism is opened, that is, the spring 5 pushes the connecting seat 4 to move rightward, the connecting seat 4 drives the needle 1 to move rightward. When the left end of the needle 1 is located in the first through hole 8, the right end of the connecting seat 4 contacts the left end of the annular baffle to block the connecting seat 4 from continuing to move rightward. The side of the connecting seat 4 is in contact with the accommodating chamber 3, and the outer side of the connecting seat 4 is coated with medical lubricating oil. When the spring 5 pushes the connecting seat 4 to move to the left, the friction between the connecting seat 4 and the accommodating chamber 3 is reduced. The buckle mechanism includes a first buckle body located on the front side of the connecting seat 4 and a second buckle body located on the rear side of the connecting seat. Since the connecting seat 4 is fixedly connected to the connecting tube 2 through the buckle mechanism, it is convenient to directly insert the blood sample tube into the second drainage hole 13. After the sampling is completed, one hand holds the connecting tube 2 and the other hand pulls out the blood sample tube to avoid leakage. The needle slip phenomenon occurs and the workload of the nursing staff is reduced. After the blood collection is completed, the needle is pulled out of the skin, and then the buckle mechanism is opened to release the fixation of the connecting seat 4 and the connecting tube 2. The spring 5 pushes the connecting seat 4 to move to the right, and the connecting seat 4 drives the needle 1 to move to the right. When the left end of the needle 1 is located in the first through hole 8, the right side surface of the connecting seat 4 contacts the left side surface of the annular baffle 9 to prevent the connecting seat 4 from continuing to move to the right, thereby preventing the needle from stabbing the nursing staff or other personnel, eliminating the risk of cross infection, and having high safety.

[0032] like Figure 3As shown in the figure, the first buckle body includes a first receiving groove 14 located on the front side of the connecting seat 4 and opening forward, a first spring 15 fixedly connected to the rear side of the first receiving groove 14, a first connecting block 16 fixedly connected to the front end of the first spring 15, a first locking block 17 fixedly connected to the front side of the first connecting block 16 by a medical adhesive, a first locking hole 10 located on the front side of the connecting tube 2 and cooperating with the first locking block 17. The first locking hole 10 communicates the receiving cavity 3 with the outside. The size of the first connecting block 16 is larger than that of the first locking hole 10, preventing the first connecting block 16 from being pushed out of the first locking hole 10 by the first spring 15 and entering the outside, thus making the connection between the connecting seat 4 and the connecting tube 2 insecure and affecting the stability of the needle 1. Both ends of the first spring 15 are fixedly connected to the rear side of the first receiving groove 14 and the rear side of the first connecting hole 16 by a medical adhesive. The front end of the right side of the first locking block 17 of the first connecting hole 16 is provided with a first inclined surface, and the rear end of the right side of the first locking hole 10 is provided with a second inclined surface. The first inclined surface and the second inclined surface are parallel, facilitating the quick separation of the first locking block 17 and the first locking hole 10. When it is necessary to retract the left end of the needle 1 into the first through hole 8, press the first locking block 17 forward, then the first locking block 17 separates from the first locking hole 10, and the spring 5 pushes the connecting seat 4 to move to the right. The connecting seat 4 drives the needle 1 to move to the right, so that the left end of the needle 1 is located within the first through hole 8.

[0033] As Figure 3 shown in the figure, the second buckle body includes a second receiving groove 18 located on the rear side of the connecting seat 4 and opening backward, a second spring 19 fixedly connected to the front side of the second receiving groove 18, a second connecting block 20 fixedly connected to the rear end of the second spring 19, a second locking block 21 fixedly connected to the rear side of the second connecting block 20 by a medical adhesive, a second locking hole 11 located on the rear side of the connecting tube 2 and cooperating with the second locking block 21. Both ends of the second spring 19 are fixedly connected to the front side of the second receiving groove 18 and the front side of the second connecting hole 20 by a medical adhesive. The second locking hole 11 communicates the receiving cavity 3 with the outside. The size of the second connecting block 20 is larger than that of the second locking hole 11, preventing the second spring 19 from pushing the second connecting block 20 out of the second hole 11 and entering the outside, thus making the connection between the connecting seat 4 and the connecting tube 2 insecure and affecting the stability of the needle 1. The rear end of the right side of the second locking block 21 is provided with a third inclined surface, and the front end of the right side of the second locking hole 11 is provided with a fourth inclined surface. The third inclined surface and the fourth inclined surface are parallel, facilitating the quick separation of the second locking block 21 and the second locking hole 11. When it is necessary to retract the left end of the needle 1 into the first through hole 8, press the second locking block 21 backward, then the second locking block 21 separates from the locking hole 11, and the spring 5 pushes the connecting seat 4 to move to the right. The connecting seat 4 drives the needle 1 to move to the right, so that the left end of the needle 1 is located within the first through hole 8.

[0034] When the left end of the needle 1 needs to be retracted into the first through hole 8, press the first clamping block 17 forward, then the first clamping block 17 is separated from the first clamping hole 10. At the same time, press the second clamping block 21 backward, then the second clamping block 21 is separated from the clamping hole 11. Then the spring 5 pushes the connecting seat 4 to move rightward, and the connecting seat 4 drives the needle 1 to move rightward, so that the left end of the needle 1 is located within the first through hole 8. The operation is simple and the safety is high.

[0035] As Figure 4 shown, the diameter of the first liquid discharge hole 12 is larger than that of the second liquid discharge hole 13. The blocking mechanism includes a first blocking plate 22 movably connected to the front side of the first liquid discharge hole 12 through a first connecting mechanism 24, and a second blocking plate 23 located behind the first blocking plate 22 and movably connected to the front side of the first liquid discharge hole 12 through a second connecting mechanism 25. The first blocking plate 22 rotates horizontally around the first connecting mechanism 24, and the second blocking plate 23 rotates on the horizontal plane around the second connecting mechanism 25. The left side surface of the first blocking plate 22 is fixedly connected to the front side surface of the first liquid discharge hole 12 through a third spring 26, and the left side surface of the second blocking plate 24 is fixedly connected to the rear side surface of the second liquid discharge hole 13 through a fourth spring 27. The right side surface of the first blocking plate 22 is in sealing contact with the right side surface of the first liquid discharge hole 12, the right side surface of the second blocking plate 23 is in sealing contact with the right side surface of the first liquid discharge hole 12, the rear side surface of the first blocking plate 22 is in sealing contact with the front side surface of the second blocking plate 23. Sealing gaskets are provided on both the right side surface and the rear side surface of the first blocking plate 22, and sealing gaskets are provided on both the front side surface and the rear side surface of the second blocking plate 23. The first blocking plate 22 and the second blocking plate 23 jointly block the second liquid discharge hole 13. When the blood sample tube is inserted into the second liquid discharge hole 13, the left end of the blood sample tube enters the first liquid discharge hole 12. At this time, the left end of the blood sample tube opens the first blocking plate 22 and the second blocking plate 23, and then the blood in the first liquid discharge hole 12 enters the blood sample tube. After the blood sample tube finishes collecting blood, pull out the blood sample tube. At this time, due to the restoring forces of the third spring 26 and the fourth spring 27, the third spring 26 pushes the first blocking plate 22 to rotate, and at the same time the fourth spring 27 pushes the second blocking plate 23 to rotate. Then the first blocking plate 22 and the second blocking plate 23 jointly block the second liquid discharge hole 13 to prevent blood from flowing out.

[0036] As Figure 5As shown in the figure, the first connection mechanism 24 includes a first connection plate 28 fixedly connected to the front side of the first plugging plate 22 by a medical adhesive, a second connection plate 29 located below the first connection plate 28 and fixedly connected to the front side of the first drainage hole 12 by a medical adhesive, and a first pin shaft 30 passing through the first connection plate 28 and the second connection plate 29. The first connection plate 28 and the second connection plate 29 rotate around the first pin shaft 30. The second connection mechanism 25 includes a third connection plate 31 fixedly connected to the rear side of the second plugging plate 23 by a medical adhesive, a fourth connection plate 32 located below the third connection plate 31 and fixedly connected to the rear side of the first drainage hole 12 by a medical adhesive, and a second pin shaft 33 passing through the third connection plate 31 and the fourth connection plate 32. The third connection plate 31 and the fourth connection plate 32 rotate around the second pin shaft 33.

[0037] The provision of the connection base and the buckle mechanism in the present invention facilitates the fixation of the needle head to the accommodation cavity. The blood collection tube can be inserted into the connection base of the accommodation cavity for blood collection. It is convenient to replace the blood sample tube. Only one hand is needed to insert the blood sample tube into the connection base for blood extraction. After the blood collection is completed, the blood sample tube can be pulled out with one hand, avoiding the phenomenon of needle displacement caused by inserting the blood sample tube with both hands. At the same time, the labor intensity of the nursing staff is reduced. After blood collection, the needle head is retracted into the accommodation cavity by the action of the buckle mechanism and the spring, avoiding the phenomenon of cross-infection caused by the needle head stabbing people, and having high safety.

Claims

1. A medical blood collection needle, comprising a needle head, a connecting tube fixedly connected to the needle head for connecting a blood collection tube, characterized in that: it further comprises a receiving cavity located inside the connecting tube and communicating with the outside at the right end, a connecting seat located inside the receiving cavity and fixedly connected to the needle head, a spring fixedly connected to the left side surface of the connecting seat and the left side surface of the receiving cavity and sleeved on the needle head, a first liquid discharge hole located on the left side surface of the connecting seat and fixedly connected to the outer surface of the right side of the needle head, a second liquid discharge hole located on the right side surface of the connecting seat and connected to the blood sample tube, a limiting mechanism connected to the receiving cavity and used to block the connecting seat from moving to the right. The first liquid discharge hole and the second liquid discharge hole are communicated, and a blocking mechanism for blocking the outflow of blood is provided between the first liquid discharge hole and the second liquid discharge hole. The connecting seat is connected to the connecting tube through a snap mechanism. The snap mechanism includes a first snap body located on the front side surface of the connecting seat and a second snap body located on the rear side surface of the connecting seat; the first snap body includes a first receiving groove located on the front side surface of the connecting seat and opening forward, a first spring fixedly connected to the rear side surface of the first receiving groove, a first connecting block fixedly connected to the front end of the first spring, a first locking block fixedly connected to the front side surface of the first connecting block, a first locking hole located on the front side surface of the connecting tube and cooperating with the first locking block. The first locking hole communicates the receiving cavity with the outside, and the size of the first connecting block is larger than the size of the first locking hole; the diameter of the first liquid discharge hole is larger than the diameter of the second liquid discharge hole. The blocking mechanism includes a first blocking plate movably connected to the front side surface of the first liquid discharge hole through a first connecting mechanism, and a second blocking plate located behind the first blocking plate and movably connected to the front side surface of the first liquid discharge hole through a second connecting mechanism. The first blocking plate rotates around the first connecting mechanism in the horizontal direction, and the second blocking plate rotates around the second connecting mechanism on the horizontal plane. The left side surface of the first blocking plate is fixedly connected to the front side surface of the first liquid discharge hole through a third spring, and the left side surface of the second blocking plate is fixedly connected to the rear side surface of the second liquid discharge hole through a fourth spring. The right side surface of the first blocking plate is in sealed contact with the right side surface of the first liquid discharge hole, the right side surface of the second blocking plate is in sealed contact with the right side surface of the first liquid discharge hole, the rear side surface of the first blocking plate is in sealed contact with the front side surface of the second blocking plate, and the first blocking plate and the second blocking plate jointly block the second liquid discharge hole; the inner side surface of the first liquid discharge hole is fixedly adhered to the outer side surface of the needle head through a medical adhesive; the second snap body includes a second receiving groove located on the rear side surface of the connecting seat and opening backward, a second spring fixedly connected to the front side surface of the second receiving groove, a second connecting block fixedly connected to the rear end of the second spring, a second locking block fixedly connected to the rear side surface of the second connecting block, a second locking hole located on the rear side surface of the connecting tube and cooperating with the second locking block. The second locking hole communicates the receiving cavity with the outside, and the size of the second connecting block is larger than the size of the second locking hole; The first connecting mechanism includes a first connecting plate fixedly connected to the front side of the first plugging plate, a second connecting plate located below the first connecting plate and fixedly connected to the front side of the first liquid discharge hole, and a first pin shaft passing through the first connecting plate and the second connecting plate. The first connecting plate and the second connecting plate rotate around the first pin shaft. The second connecting mechanism includes a third connecting plate fixedly connected to the rear side of the second plugging plate, a fourth connecting plate located below the third connecting plate and fixedly connected to the rear side of the first liquid discharge hole, and a second pin shaft passing through the third connecting plate and the fourth connecting plate. The third connecting plate and the fourth connecting plate rotate around the second pin shaft.

2. The medical blood collection needle according to claim 1, characterized in that: A first inclined surface is provided at the front end of the right side surface of the first clamping block, and a second inclined surface is provided at the rear end of the right side surface of the first clamping hole. The first inclined surface and the second inclined surface are parallel.

3. The medical blood collection needle according to claim 1, characterized in that: A third inclined surface is provided at the rear end of the right side surface of the second clamping block, and a fourth inclined surface is provided at the front end of the right side surface of the second clamping hole. The third inclined surface and the fourth inclined surface are parallel.

4. The medical blood collection needle according to claim 1, characterized in that: A first through hole for the needle to pass through is provided on the left side surface of the accommodating cavity. The limiting mechanism includes an annular baffle fixedly connected to the surface of the accommodating cavity, and the central axis of the annular baffle coincides with the central axis of the accommodating cavity.

5. The medical blood collection needle according to claim 1, characterized in that: The connecting seat is made of medical rubber material.

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