Blood taking needle and blood taking equipment
By introducing limiting components and elastic elements into the blood collection needle, the problem of needle core deflection when piercing the human body is solved, ensuring needle stability and improving the accuracy and safety of blood collection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU KYUAN MEDICAL APP CO LTD
- Filing Date
- 2025-01-09
- Publication Date
- 2026-04-21
AI Technical Summary
The needle core of existing blood collection needles is easily deflected by the spring when it is inserted into the human body, causing the needle tip to deflect at the blood collection site and affecting the blood collection effect.
The design employs limiting components and elastic elements. The limiting structure within the outer shell limits the inner shell and the needle core, ensuring the needle core moves stably upward and downward within the outer shell, preventing needle rotation and improving blood collection accuracy.
It achieves precise positioning of the needle when it enters the human body, avoids deflection, and improves blood collection efficiency and safety.
Smart Images
Figure CN224140819U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical devices, specifically to a blood collection needle and blood collection equipment. Background Technology
[0002] In the field of medical blood collection, disposable blood collection devices are popular among medical staff and patients due to their small size, safe use, and ease of operation. They are currently widely used in various medical institutions and among diabetic patients. These devices feature a built-in ejection mechanism, a compact structure, and are designed for single use only, ensuring safety and convenience. Therefore, they possess strong market development potential.
[0003] Current blood collection needles typically employ a method where pressing a sliding sleeve that directly contacts the patient's skin causes the needle core to be ejected under the action of a spring, and then the needle tip punctures the skin's extremities to collect blood. However, due to the influence of the spring, the needle tip of existing blood collection needles is prone to deflection during insertion, causing the needle to deviate at the blood collection site, thus affecting the effectiveness of blood collection. Utility Model Content
[0004] The present invention aims to solve the above-mentioned technical problem, namely that the needle core of the existing blood collection needle is affected by the spring, and the needle tip is prone to deflection when it is inserted, causing the needle to deflect at the blood collection site when it penetrates human tissue cells, thus affecting the blood collection effect.
[0005] In a first aspect, the present invention provides a blood collection needle, comprising an outer shell, an inner shell slidably disposed within the outer shell, and a needle core disposed within the outer shell and the inner shell by means of an elastic member;
[0006] A limiting component is disposed on the inner wall of the outer shell to cooperate with the bottom portion of the inner shell extending into or entering the outer shell, thereby restricting the movement position of the inner shell.
[0007] In the preferred embodiment of the above-mentioned blood collection needle, the outer shell has a first part and a second part, the second part has a first inner wall, a second inner wall, a third inner wall and a fourth inner wall connected in sequence, and the limiting component includes a first limiting structure vertically arranged on the first inner wall and the third inner wall, and a second limiting structure vertically arranged on the second inner wall and the fourth inner wall. The first limiting structure is used to abut against the outer walls on both sides of the inner shell, and the second limiting structure is used to extend into the grooves in the outer wall of the inner shell.
[0008] In the preferred embodiment of the above-mentioned blood collection needle, both the first and second parts of the outer shell are rectangular frustum structures, and the size of the first part is smaller than the size of the second part.
[0009] In the preferred embodiment of the above-mentioned blood collection needle, the elastic element is confined inside the first part of the outer shell, and the top of the needle core can extend into the first part.
[0010] In the preferred embodiment of the above-mentioned blood collection needle, the top surface inside the first part of the outer shell has a locking member, and the end of the elastic member is restricted and fixed by the locking member.
[0011] In the preferred technical solution of the above-mentioned blood collection needle, the first limiting structure is a wedge-shaped block, and the first limiting structure has a wedge-shaped surface at both the top and bottom ends in the vertical direction.
[0012] In the preferred embodiment of the above-mentioned blood collection needle, the second limiting structure is a limiting protrusion forming a limiting channel. The limiting protrusion is used to extend into the groove of the inner housing to restrict the needle core and the inner housing from moving only in the vertical direction.
[0013] In the preferred embodiment of the above-mentioned blood collection needle, a first protrusion is formed on the lower part of the inner wall of the second part of the outer shell, and a second protrusion corresponding to the first protrusion is formed on the outer periphery of the inner shell. When the inner shell descends to a predetermined position within the outer shell, the first protrusion abuts against the second protrusion.
[0014] In the preferred embodiment of the above-mentioned blood collection needle, a needle sleeve detachably disposed at the bottom end of the inner housing is also included, and the needle tip of the needle core is inserted into the needle sleeve.
[0015] In a second aspect, the present invention also provides a blood collection device, which includes the aforementioned blood collection needle.
[0016] The beneficial effects of this utility model are that, by using a first limiting structure configured inside the outer shell to press against the inner shell, and by using a second limiting structure configured inside the outer shell to limit the buckle on the needle core, the inner shell can stably move upward within the outer shell and the needle core can stably move downward to extend from the bottom end of the inner shell during blood collection. This ensures that the needle tip of the needle core can accurately pierce the blood collection site without circumferential rotation, thereby improving the blood collection effect of this application and making it practical. Attached Figure Description
[0017] Figure 1 This is the front view of the blood collection needle;
[0018] Figure 2 This is a cross-sectional view of a blood collection needle;
[0019] Figure 3 An exploded view of a blood collection needle;
[0020] Figure 4 This is a sectional view of the outer shell;
[0021] Figure 5 The main view of the outer shell Figure 1 ;
[0022] Figure 6 The main view of the outer shell Figure 2 ;
[0023] Figure 7 This is the front view of the inner shell;
[0024] Figure 8 This is a structural diagram of the needle core, elastic element, and needle sleeve.
[0025] In the figure: outer shell 1, first part 11, locking part 111, second part 12, first protrusion 13, second protrusion 14, inner shell 2, slot 21, vertical groove 22, sliding groove 23, needle core 3, main body 31, buckle 311, needle 32, elastic element 4, first limiting structure 51, second limiting structure 52, needle sleeve 6. Detailed Implementation
[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.
[0027] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0028] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] like Figures 1 to 8 As shown, the blood collection needle of this utility model includes an outer shell 1, an inner shell 2 slidably disposed within the outer shell 1, and a needle core 3 disposed inside the outer shell 1 and the inner shell 2 by means of an elastic member 4; a limiting component is disposed on the inner wall of the outer shell 1 to cooperate with the bottom part of the inner shell 2 extending out or entering the outer shell 1 and to limit the movement position of the inner shell 2.
[0030] See Figure 1 , Figure 2 , Figure 7 The inner shell 2 is slidably disposed inside the outer shell 1. The inner shell 2 has a hollow structure. The needle core 3 includes a main body 31 and a needle 32. The top periphery of the main body 31 of the needle core 3 has an enlarged diameter portion. The main body 31 of the needle core 3 is slidably disposed inside the outer shell 1 and the inner shell 2. The main body 31 is mounted on the upper part of the inner shell 1 by means of an elastic member 4. The lower end of the elastic member 4 abuts against the enlarged diameter portion. The main body 31 of the needle core 3 also has at least one set of horizontally arranged buckles 311. The top of the inner shell 2 has a groove 21 that matches the buckles 311.
[0031] When the needle core 3 is charged, the needle core 3 is pushed up so that the buckle 311 of the main body 31 of the needle core 3 is above the slot 21 of the inner shell 2. The elastic member 4 stores elastic potential energy. Then, the pushing force on the needle core 3 is released and the elastic member 4 releases part of the elastic potential energy, so that the main body 31 of the needle core 3 moves down inside the inner shell 2 and the buckle 311 abuts against the slot 21 of the inner shell 2, so that the inner shell 2 and the needle core 3 are in a stationary position inside the outer shell 1.
[0032] When collecting blood, keep the outer shell 1 in a fixed position, push up the bottom of the inner shell 2 that extends from the bottom of the outer shell 1. When the buckle 311 of the needle core 3 is located below the slot 21, the buckle 311 and the needle core 3 are no longer restricted, and the elastic element 4 releases its elastic stored energy. At this time, the needle tip 32 of the needle core 3 extends out of the bottom of the inner shell 2 under the action of the elastic element 4, so that the needle tip 32 pierces the blood collection site, and blood collection is completed.
[0033] See Figure 2 The limiting component is disposed on the inner wall of the outer shell 1. The limiting component is used to restrict the vertical movement of the inner shell 2 and the needle core 3 within the outer shell 1, ensuring that the inner shell 2 moves only in the vertical direction within the outer shell 1. This prevents the inner shell 2 from shifting left or right within the outer shell 1, which could cause the buckle 311 to disengage from the slot 21 and affect the normal use of the blood collection needle. In addition, the limiting component can restrict the protrusion position of the needle core 3, preventing the needle core 3 from rotating circumferentially due to the influence of the elastic element 4 when moving inside the inner shell 2, thus affecting the blood collection effect.
[0034] In one or more embodiments, a vertical groove 22 is provided on the side wall of the inner housing 2 directly below the slot 21.
[0035] See Figure 2When blood is collected, after the bottom of the inner housing 2 is pushed up so that the buckle 311 is below the slot 21, the needle core 3 and the buckle 311 are pushed down under the action of the elastic member 4. When the buckle 311 moves down, it will enter the vertical groove 22 of the inner housing 2 and continue to move down in the vertical groove 22. Through this setting, the obstruction and limitation of the buckle 311 by the inner housing 2 can be reduced, further ensuring the speed of the needle 32 piercing the blood collection site and improving the blood collection effect of this application.
[0036] In one or more embodiments, the outer shell 1 has a first part 11 and a second part 12. The second part 12 has a first inner wall, a second inner wall, a third inner wall and a fourth inner wall connected in sequence. The limiting component includes a first limiting structure 51 vertically arranged on the first inner wall and the third inner wall, and a second limiting structure 52 vertically arranged on the second inner wall and the fourth inner wall. The first limiting structure 51 is used to abut against the outer walls on both sides of the inner shell 2, and the second limiting structure 52 is used to extend into the groove 23 on the outer wall of the inner shell 2.
[0037] See Figure 2 , Figures 4 to 6 The inner housing 2 has a sliding groove 23 spaced on the side wall with the vertical groove 22, and the two buckles 311 of the needle core 3 are configured to slide in the sliding groove 23 of the inner housing 2.
[0038] See Figure 2 , Figures 4 to 6 The first limiting structure 51 has two parts, which are used to abut against the outer wall of the inner housing 2 on the side with the slot 21. The second limiting structure 52 has two parts, which are used to limit the buckle 311 located in the slide groove 23.
[0039] Specifically, during blood collection, the bottom end of the inner shell 2 is pressed. As the inner shell 2 moves upward inside the outer shell 1, the two first limiting structures 51 can restrict the position of the inner shell 2, preventing the inner shell 2 from deflecting during upward movement and causing misalignment between the buckle 311 on the needle core 3 and the slot 21 at the top of the inner shell 2, thus affecting the bottom end of the needle core 3 extending out of the bottom end of the inner shell 2. At the same time, as the inner shell 2 moves upward inside the outer shell 1, the buckle 311 located in the sliding groove 23 of the inner shell 2 is restricted by the second limiting structure 52, thereby preventing the needle core 3 from rotating due to the influence of the elastic element 4. This, in turn, prevents the needle tip 32 of the needle core 3 from rotating out of the bottom end of the inner shell 2, and prevents the needle tip 32 from rotating inside the human tissue, thus avoiding excessive damage to human tissue cells and improving the blood collection effect of this application.
[0040] In one or more embodiments, the elastic member 4 is confined inside the first part 11 of the outer shell 1, and the top of the needle core 3 can extend into the first part 11; the top surface inside the first part 11 of the outer shell 1 has a locking member 111, and the end of the elastic member 4 is confined and fixed by the locking member 111.
[0041] See Figure 2 The elastic element 4 is disposed inside the first part 11 of the outer shell 1. The needle core 3 is partially located inside the first part 11 of the outer shell 1 by means of the elastic element 4. With this arrangement, the needle core 3 can have sufficient movement space in the axial length direction, while the outer peripheral dimension of the first part 11 of the outer shell 1 can be reduced, thereby maximizing the use of raw materials. In addition, the locking element 111 disposed on the top surface inside the first part 11 can lock the top of the elastic element 4 in the first part 11 of the outer shell 1, thereby preventing the elastic element 4 from shifting back and forth in the first part 11 and affecting the stability of its connection with the needle core 3.
[0042] In one or more embodiments, the first limiting structure 51 is a wedge-shaped block, and the first limiting structure 51 has a wedge-shaped surface at both its top and bottom ends in the vertical direction. See also Figure 2 , Figures 4 to 6 This design reduces the weight of the first limiting mechanism while ensuring that the first limiting block always presses against the side walls of the inner shell.
[0043] In one or more embodiments, the second limiting structure 52 is a limiting protrusion that forms a limiting channel. The limiting protrusion is used to extend into the groove 23 of the inner housing 2 to limit the movement of the needle core 3 and the inner housing 2 only in the vertical direction.
[0044] See Figure 2 , Figures 4 to 6 The second limiting structure 52 includes a limiting protrusion having a first part 11 and a second part 12, forming a limiting channel between the first part 11 and the second part 12. When the limiting protrusion enters the inner shell 2 slide groove 23, the buckle 311 disposed on the side of the needle core 3 will enter the limiting channel of the limiting protrusion. When the needle core 3 moves downward inside the inner shell 2, the second limiting structure 52 can restrict the position of the buckle 311, thereby preventing the needle core 3 from rotating inside the inner shell 2 due to the influence of the elastic element 4, and thus preventing the needle 32 from rotating after piercing human tissue cells, which would affect the blood collection effect of this application.
[0045] In one or more embodiments, a first protrusion 13 is formed on the lower part of the inner wall of the second part 12 of the outer shell 1, and a second protrusion 14 corresponding to the first protrusion 13 is formed on the outer periphery of the inner shell 2. When the inner shell 2 descends to a predetermined position inside the outer shell 1, the first protrusion 13 and the second protrusion 14 abut against each other.
[0046] See Figure 2 , Figures 4 to 6When the needle core 3 is charging, the elastic element 4 pushes the needle core 3 downward, so that the buckle 311 on the needle core 3 abuts against the groove 21 of the inner shell 2, causing the inner shell 2 to move downward inside the outer shell 1. The second protrusion 14 on the outer periphery of the inner shell 2 abuts against the first protrusion 13 on the inner wall of the outer shell 1, thereby restricting the position of the inner shell 2 and preventing the inner shell 2 from moving down too much, which would cause the elastic potential energy stored in the elastic element 4 to be completely released. This ensures that the needle tip 32 of the needle core 3 can smoothly pierce the bottom of the inner shell 2.
[0047] In one or more embodiments, a needle sleeve 6 is detachably disposed at the bottom of the inner housing 2, and the needle tip 32 of the needle core 3 is inserted into the needle sleeve 6.
[0048] See Figure 2 The needle sleeve 6 is made of rigid silicone. The needle sleeve 6 can enter the inner housing 2 through the bottom end, allowing the needle tip 32 of the needle core 3 to be inserted into the needle sleeve 6, thus protecting the needle tip 32 and reducing contamination. Furthermore, the needle sleeve 6 can also be used to push the needle core 3 upwards, allowing the elastic element 4 to store elastic potential energy, and enabling the latches 311 on the outer periphery of the needle core 3 to be locked into the slots 21 of the inner housing 2.
[0049] In one or more embodiments, both the first portion 11 and the second portion 12 of the outer casing 1 are truncated rectangular structures, with the size of the first portion 11 being smaller than the size of the second portion 12. See also Figure 2 , Figure 4 This design allows for a reduction in the size of the outer casing 1, as well as a reduction in the material and weight of the outer casing 1, thereby reducing the production cost of the blood collection needle and making it practical.
[0050] In addition, this utility model also provides a blood collection device having the blood collection needle in any of the above embodiments.
[0051] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.
Claims
1. A lancet, comprising: It includes an outer shell, an inner shell slidably disposed within the outer shell, and a needle core disposed inside the outer shell and the inner shell by means of an elastic member; A limiting component is disposed on the inner wall of the outer shell to cooperate with the bottom portion of the inner shell extending into or entering the outer shell, thereby restricting the movement position of the inner shell.
2. The lancet of claim 1 wherein: The outer shell has a first part and a second part. The second part has a first inner wall, a second inner wall, a third inner wall and a fourth inner wall connected in sequence. The limiting component includes a first limiting structure vertically arranged on the first inner wall and the third inner wall, and a second limiting structure vertically arranged on the second inner wall and the fourth inner wall. The first limiting structure is used to abut against the outer walls on both sides of the inner shell, and the second limiting structure is used to extend into the sliding grooves on the outer walls of the inner shell.
3. The lancet of claim 2 wherein: Both the first and second parts of the outer shell are rectangular frustum structures, with the size of the first part being smaller than that of the second part.
4. The lancet of claim 2 or 3 wherein: The elastic element is confined inside the first part of the outer shell, and the top of the needle core can extend into the first part.
5. The lancet of claim 4 wherein: The first part of the outer shell has a locking member on its inner top surface, and the end of the elastic member is restricted and fixed by the locking member.
6. The lancet of claim 2 wherein: The first limiting structure is a wedge-shaped block, and the first limiting structure has a wedge-shaped surface at both the top and bottom ends in the vertical direction.
7. The lancet of claim 2 wherein: The second limiting structure is a limiting protrusion that forms a limiting channel. The limiting protrusion is used to extend into the groove of the inner housing to restrict the needle core and the inner housing from moving only in the vertical direction.
8. The lancet of claim 2 wherein: A first protrusion is formed on the lower part of the inner wall of the second part of the outer shell, and a second protrusion corresponding to the first protrusion is formed on the outer periphery of the inner shell. When the inner shell descends to a predetermined position within the outer shell, the first protrusion abuts against the second protrusion.
9. The lancet of claim 1 wherein: It also includes a needle sleeve that is detachably disposed at the bottom end of the inner housing, and the needle core has a needle tip that is inserted into the needle sleeve.
10. A blood sampling device, characterized by The blood collection needle includes any one of claims 1-9.