Pressing type blood taking needle

Abstract

A pressing type blood taking needle comprises a shell, a first needle head, a second needle head, a first needle head and a second needle head, the sliding sleeve is arranged in the first channel, an axial second channel is arranged in the sliding sleeve, a strip-shaped through groove extending from an opening in the upper end to the lower end is formed in the sliding sleeve, and a blocking piece is arranged on the side wall of the strip-shaped through groove; the needle core is arranged in the second channel, a sliding block is arranged on the needle core, the sliding block can penetrate through the strip-shaped through groove, and the blocking piece can support the needle core through the sliding block; one end of the spring abuts against the needle core, and the other end of the spring abuts against the upper cover. According to the pressing type blood taking needle, a second spring does not need to be arranged at the lower end of the needle core, the needle core can automatically retract into the shell after blood taking is completed, and the pressing type blood taking needle is simple in structure and convenient to install.

Description

[0001] This application is a divisional application of the patent application with application number 202220660156.2 and invention name "A press-type blood collection needle" filed with the Patent Office of the State Intellectual Property Office of China on March 25, 2022. Technical Field

[0002] The utility model relates to the technical field of medical instruments, in particular to a pressing type blood collection needle. Background Art

[0003] Most of the tests and examinations performed on patients in clinical practice require the use of blood samples from patients. When collecting blood samples from the patient's fingertips, it is usually necessary to first pierce the finger with a blood collection needle, and then use a blood collection tube to collect the blood sample into a specimen tube for storage and inspection. Disposable blood collection needles are popular among medical staff and patients for their small size, safe use, and convenient operation. They are currently widely used in various medical institutions and diabetic patients. In order to ensure the safety of medical staff and users, the needle of the blood collection needle needs to be able to automatically retract into the shell after blood collection. The Chinese utility model patent with patent number "CN208610852 U" discloses a push-type blood collection needle, which uses a second spring set under the needle to retract the needle into the sliding sleeve through the elastic force of the second spring. The structure is complex and the assembly efficiency is low. Utility Model Content

[0004] The utility model aims to provide a push-type blood collection needle with a simple structure and convenient assembly.

[0005] The technical solution adopted by the utility model is: a push-type blood collection needle, comprising:

[0006] A housing, wherein a first axial passage is provided in the housing;

[0007] A sliding sleeve, wherein the sliding sleeve is arranged in the first channel, an axial second channel is arranged in the sliding sleeve, a strip-shaped through groove extending from an upper end opening to a lower end is arranged on the sliding sleeve, and a blocking member is arranged on a side wall of the strip-shaped through groove;

[0008] A needle core, the needle core is arranged in the second channel, a slider is arranged on the needle core, the slider can pass through the strip-shaped through groove, and the blocking member can support the needle core through the slider;

[0009] A spring, one end of which abuts against the needle core, and the other end of which abuts against the upper cover.

[0010] The beneficial effects of the utility model are:

[0011] 1) When not in use, the lower end of the sliding sleeve extends out of the needle outlet, and the sliding sleeve is located in the first channel at this time, the side wall of the sliding sleeve is in a free state, and the slider of the needle core is against the upper end of the blocking member. When blood sampling is required, the lower end of the sliding sleeve is against the blood sampling part, and the housing is pressed downward by the hand, and the housing moves downward. Since the lower end of the sliding sleeve is against the blood sampling part, the sliding sleeve does not move, and the spring is squeezed, and the pressure on the needle core increases. The pressure of the slider on the arc clip increases, and the arc clips move away from each other and expand. The expanded width is greater than the width of the slider. After the slider passes through the blocking member, under the action of the spring, the slider quickly pops up downward along the strip groove, and the needle quickly pops up with the needle core and pierces the needle outlet to complete blood sampling. After the needle pops up quickly under the action of the spring, the spring is stretched, and the spring needs to return to a natural state under the action of the elastic force. Therefore, under the action of the spring, the needle retracts into the housing. The push-type blood collection needle disclosed by the utility model does not need to be provided with a second spring at the lower end of the needle core, and the needle core can automatically retract into the shell after completing blood collection, and has a simple structure and is easy to install.

[0012] 2) Compared with the traditional blood collection needle, during production and assembly, the sliding sleeve is squeezed inward by the housing, and then the needle core is clamped by the squeezed sliding sleeve to fix the needle core. During assembly, since the housing exerts squeezing force on the sliding sleeve, and the squeezed sliding sleeve exerts squeezing force on the needle core, the sliding sleeve and the housing are not in a natural state, which is difficult to assemble and has low assembly efficiency. The blood collection needle disclosed in the utility model supports the needle core by providing a blocking member on the side wall of the strip-shaped through groove. When not in use, the housing and the sliding sleeve do not squeeze each other and are in a natural state. This state is more stable, and since there is no need to squeeze the sliding sleeve, the operation is simple and the assembly is quick when assembling the blood collection needle during the production process.

[0013] 3) Through the arrangement of the strip-shaped through groove, the first channel and the second channel, the sliding sleeve itself has elasticity of radial deformation, which facilitates the rapid and stable ejection of the needle core.

[0014] Furthermore, the blocking member comprises a supporting surface, and at least a partial area of ​​the sliding block arranged on the needle core can abut against the supporting surface.

[0015] Furthermore, the sliding block includes a force-bearing surface, the force-bearing surface and the blocking member abut against each other, and the force-bearing surface and the supporting surface are arranged in parallel.

[0016] Furthermore, at least two strip-shaped through grooves are provided, and the strip-shaped through grooves are arranged in a circular matrix.

[0017] Furthermore, the number and position of the sliders are matched with the number and position of the strip-shaped through slots, so that one slider is arranged in each strip-shaped through slot.

[0018] Furthermore, a needle head is provided at the lower end of the needle core, a limiting protrusion is provided on the side wall of the needle core, the limiting protrusion is arranged above the needle head, and the limiting protrusion and the side wall of the needle core are integrally connected.

[0019] Furthermore, it also includes a protection component, which includes a needle sleeve and a protective sleeve. One end of the needle sleeve is interference-fitted with the needle head, and the other end of the needle sleeve is sleeved with the protective sleeve. The upper end of the protective sleeve abuts against the shell.

[0020] Furthermore, the diameter of the bottom end of the first channel is smaller than the diameter of the top end of the first channel, and the first channel smoothly transitions from the top end to the bottom end, and the diameter gradually decreases.

[0021] Furthermore, it also includes an upper cover, which is detachably connected to the shell, and the upper cover abuts against one end of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of a blood collection needle according to an embodiment of the utility model;

[0023] Figure 2 A cross-sectional view of a blood collection needle according to an embodiment of the utility model in use;

[0024] Figure 3 A three-dimensional diagram of a sliding sleeve according to an embodiment of the present utility model;

[0025] Figure 4 It is a three-dimensional diagram of a needle core according to an embodiment of the present utility model.

[0026] In the figure:

[0027] 1. Shell; 11. First channel; 2. Sliding sleeve; 21. Second channel; 22. Strip-shaped through groove; 23. Arc-shaped clip; 24. Blocking member; 241. Support surface; 25. Angle; 3. Needle core; 31. Needle head; 32. Sliding block; 321. Force-bearing surface; 33. Position-limiting protrusion; 4. Spring; 5. Upper cover; 6. Needle sleeve; 7. Protective sleeve. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0029] See attached Figure 1As shown, a push-type blood collection needle in this embodiment includes a housing 1, a sleeve 2, a needle core 3 and a spring 4. The housing 1, the sleeve 2 and the needle core 3 are all integrally formed injection molded parts. A needle outlet is formed at the lower end of the housing 1, and an upper cover 5 is detachably connected to the upper end. The sleeve 2 can slide in the housing 1, and the lower end can extend from the needle outlet to the outside of the housing 1. A needle head 31 is provided at the lower end of the needle core 3, and can slide relative to the sleeve 2 to expose the needle head 31 at the needle outlet. One end of the spring 4 abuts against the needle core 3, and the other end abuts against the upper cover 5. A protective component is also included, and the protective component includes a needle sleeve 6 that is interference-fitted on the needle head 31, and the lower end of the needle sleeve 6 extends out of the needle outlet and is sleeved with a protective sleeve 7, and the upper end of the protective sleeve 7 abuts against the housing 1.

[0030] In some embodiments, see Appendix Figure 2 As shown, an axial first channel 11 is provided in the shell 1, the sliding sleeve 2 is provided in the first channel 11, the upper cover 5 and the first channel 11 are connected by snapping, the diameter of the bottom end of the first channel 11 is smaller than the diameter of the top end of the first channel 11, and the first channel 11 smoothly transitions from the top end to the bottom end, and the diameter gradually decreases. As the diameter of the first channel 11 gradually decreases, the side wall of the first channel 11 limits the sliding sleeve 2, and then limits the needle core 3 in the sliding sleeve 2, so that the position of the needle core 3 is more accurate when it contacts the patient's skin.

[0031] In some embodiments, see Appendix Figure 2 and attached Figure 3As shown, a second channel 21 for the needle core 3 to slide is provided in the sliding sleeve 2, and two strip through grooves 22 are extended from the upper end opening to the lower end of the sliding sleeve 2. The two strip through grooves 22 are symmetrically arranged, and the two strip through grooves 22 divide the upper end of the sliding sleeve 2 into two symmetrical arc-shaped clips 23. The two symmetrical arc-shaped clips 23 on the upper end of the sliding sleeve 2 are elastic and can move away from each other or approach each other when subjected to external force. A blocking member 24 is provided on the side wall of the strip through groove 22, and the blocking member 24 is integrally connected to the side wall of the strip through groove 22. When not in use, the two symmetrical arc-shaped clips 23 on the upper end of the sliding sleeve 2 are not squeezed by external force and are in a natural state. The needle core 3 is supported by the blocking member 24. Compared with the traditional method of squeezing the arc-shaped clip 23 inwardly through the shell 1, the needle core 3 is clamped and then fixed by the two arc-shaped clips 23. By providing a blocking member 24 on the side wall of the strip through groove 22 to support the needle core 3, this state is more stable. Moreover, since the two arc-shaped clips 23 are not squeezed by external force and are in a natural state, when assembling the blood collection needle, the operation is simple and the assembly is quick. The blocking member 24 includes a support surface 241, which is located on the side close to the upper cover 5. When not in use, the needle core 3 is supported by the support surface 241. The angle 25 formed by the support surface 241 and the side of the strip-shaped through groove 22 is an obtuse angle, preferably 120-150 degrees. When the needle core 3 is not subjected to external force, the support surface 241 supports the needle core 3. When the needle core 3 is subjected to external force, the needle core 3 can slide downward along the support surface 241, and then the needle core 3 can slide relative to the sliding sleeve 2 to expose the needle tip 31 at the needle outlet. The blocking member 24 can be a quadrangular prism or a hemispherical body, as long as it can support the needle core 3 in a natural state, and when the needle core 3 is subjected to external force, the needle core 3 slides downward along the second channel 21.

[0032] In some embodiments, see Appendix Figure 4As shown, a slider 32 is provided on the side wall of the needle core 3, and the slider 32 can pass through the strip groove 22 and abut against the side wall of the strip groove 22. When not in use, the slider 32 is above the blocking member 24, and the slider 32 includes a force-bearing surface 321, which abuts against the blocking member 24, and the force-bearing surface 321 and the supporting surface 241 of the blocking member 24 are arranged in parallel, and the blocking member 24 supports the slider 32, thereby supporting the needle core 3. When subjected to external force, the pressure of the slider 32 on the blocking member 24 increases, so that the two arc-shaped clips 23 at the upper end of the sliding sleeve 2 move away from each other, and the slider 32 slides down along the strip groove 22, so that the needle core 3 slides down along the second channel 21. In this embodiment, two sliders 32 are provided, and the positions of the two sliders 32 are adapted to the positions of the strip through grooves 22, so that a slider 32 is provided in each strip through groove 22, and the movement trajectory of the slider 32 is restricted by the strip through grooves 22. Through the symmetrical arrangement of the sliders 32, when subjected to external force, the needle core 3 can slide down along the second channel 21, and no positional displacement occurs in the second channel 21, thereby improving the stability of the needle core 3 in sliding down.

[0033] In some embodiments, see Appendix Figure 4 As shown, a limiting protrusion 33 is provided on the side wall of the needle core 3, and the limiting protrusion 33 is provided above the needle head 31. The limiting protrusion 33 and the side wall of the needle core 3 are integrally connected, and the limiting protrusion 33 can slide down in the second channel 21 with the needle core 3. When the needle head 31 is exposed at the needle outlet, the limiting protrusion 33 cannot pass through the needle outlet. Due to the obstruction of the limiting protrusion 33, the needle core 3 cannot continue to slide down, thereby preventing the needle head 31 from being exposed too much at the needle outlet and piercing too deeply into the skin at the blood collection site, causing damage to the skin at the blood collection site, thereby improving the safety of the blood collection needle.

[0034] During assembly, firstly, the spring 4 is mounted on the needle core 3, and then the needle core 3 is inserted into the sliding sleeve 2 from top to bottom until the slider 32 on the needle core 3 abuts against the blocking member 24, and then the sliding sleeve 2 is inserted into the housing 1 from top to bottom, so that the entire sliding sleeve 2 enters the first channel 11, and the upper cover 5 is covered, and finally the needle sleeve 6 is inserted into the needle outlet and covered with the protective cover 7 to complete the assembly.

[0035] Usage process: When not in use, the lower end of the sliding sleeve 2 extends out of the needle outlet, and the sliding sleeve 2 is located in the first channel 11, the side wall of the sliding sleeve 2 is in a free state, and the slider 32 of the needle core 3 abuts against the upper end of the blocking member 24. When blood collection is required, the needle sleeve 6 and the protective sleeve 7 are removed, the lower end of the sliding sleeve 2 abuts against the blood collection part, the housing 1 is held and pressed downward, and the housing 1 moves downward. Since the lower end of the sliding sleeve 2 abuts against the blood collection part, the sliding sleeve 2 does not move, and the spring 4 is squeezed, and the pressure on the needle core 3 increases instantly, and the slider 32 increases the pressure on the arc clip 23, and the two arc clips 23 move away from each other. The slider 32 slides downward along the strip through groove 22, and the needle quickly slides with the needle core 3 and pierces the needle outlet to complete blood collection.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0037] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A push-type blood collection needle, characterized in that: include: A housing (1), wherein a first axial passage (11) is provided in the housing (1); A sliding sleeve (2), the sliding sleeve (2) being arranged in the first channel (11), the sliding sleeve (2) being provided with an axial second channel (21), the sliding sleeve (2) being provided with a strip-shaped through groove (22) extending from an upper end opening to a lower end, the two strip-shaped through grooves (22) dividing the upper end of the sliding sleeve (2) into two symmetrical arc-shaped clips (23), and a blocking member (24) being provided on a side wall of the strip-shaped through groove (22); A needle core (3), the needle core (3) being arranged in the second channel (21), the needle core (3) being provided with a slider (32), the slider (32) being capable of passing through the strip-shaped through groove (22), and the blocking member (24) being capable of supporting the needle core (3) through the slider (32); A spring (4), one end of the spring (4) abuts against the needle core (3), and the other end of the spring (4) abuts against the upper cover (5).

2. A push-type blood collection needle according to claim 1, characterized in that: The blocking member (24) comprises a supporting surface (241), and at least a partial area of ​​a sliding block (32) arranged on the needle core (3) can abut against the supporting surface (241).

3. A push-type blood collection needle according to claim 2, characterized in that: The sliding block (32) comprises a force-bearing surface (321), the force-bearing surface (321) and the blocking member (24) are in contact with each other, and the force-bearing surface (321) and the supporting surface (241) are arranged in parallel.

4. The push-type blood collection needle according to claim 1, characterized in that: At least two of the strip-shaped through grooves (22) are provided, and the strip-shaped through grooves (22) are arranged in a circular matrix.

5. The push-type blood collection needle according to claim 4, characterized in that: The number and position of the sliding blocks (32) are matched to the number and position of the strip-shaped through slots (22), so that one sliding block (32) is arranged in each strip-shaped through slot (22).

6. The push-type blood collection needle according to claim 1, characterized in that: A needle head (31) is provided at the lower end of the needle core (3), and a limiting protrusion (33) is provided on the side wall of the needle core (3). The limiting protrusion (33) is arranged above the needle head (31), and the limiting protrusion (33) and the side wall of the needle core (3) are integrally connected.

7. The push-type blood collection needle according to claim 6, characterized in that: It also comprises a protection component, the protection component comprising a needle sleeve (6) and a protection sleeve (7), one end of the needle sleeve (6) is sleeved with the needle head (31) in an interference fit, the other end of the needle sleeve (6) is sleeved with the protection sleeve (7), and the upper end of the protection sleeve (7) is in contact with the housing (1).

8. The push-type blood collection needle according to claim 1, characterized in that: The diameter of the bottom end of the first channel (11) is smaller than the diameter of the top end of the first channel (11), and the first channel (11) smoothly transitions from the top end to the bottom end, with the diameter gradually decreasing.

9. The push-type blood collection needle according to claim 1, characterized in that: It also comprises an upper cover (5), wherein the upper cover (5) and the housing (1) are detachably connected, and the upper cover (5) abuts against one end of the spring (4).

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