Blood collector capable of preventing false triggering

Abstract

The utility model provides a hemostix capable of preventing false triggering. The hemostix comprises a steel needle protection cylinder, an excitation cap and a shell which are arranged in a sleeved mode from inside to outside. The front portion and the rear portion of the steel needle protection cylinder are connected through an easy-to-break portion, a top rib used for abutting against the outer shell to limit descending of the steel needle protection cylinder is arranged on the front portion, and if the front portion is not twisted off, when the excitation cap is accidentally touched by external force to drive the steel needle protection cylinder to move downwards, the top rib on the front portion can abut against a descending limiting blocking piece in an inner cavity of the outer shell, and the steel needle protection cylinder can move downwards. The descending of the steel needle protection cylinder is limited, and the steel needle is prevented from popping up; the steel needle is fixedly arranged in the rear part, and a guide strip rib is constructed on the periphery of the rear part; deformable pins are arranged at the end of the excitation cap, and needle outlet penetrating grooves corresponding to the guide strip ribs are formed between the deformable pins. The shell is connected with the rear portion of the steel needle protection cylinder through an elastic piece, and an abutting and supporting body is arranged in the shell. The device is only composed of the steel needle protection cylinder, the excitation cap, the shell, the spring and the protection cap, the structure is simplified, assembling is convenient, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical blood sampling devices, in particular to a blood sampling device capable of preventing false triggering. Background Art

[0002] The safety blood collection needle is a medical blood collection device for collecting trace amounts of peripheral blood. It is a disposable peripheral blood collection device specially designed for use in medical and health departments. Diabetic patients or other users can also use it to collect trace amounts of peripheral blood samples for blood sugar testing.

[0003] The main structure of the safety blood collection needle on the market is to press the trigger structure to trigger the structure inside the safety needle, so that the blood collection needle pops out and pierces the skin to collect blood, such as a blood collection pen published in publication number CN218651818U;

[0004] However, this type of blood collection needle has the following two main problems:

[0005] On the one hand, there are many parts, the assembly takes a long time and the cost is high, which imposes a cost burden on patients;

[0006] On the one hand, the trigger has no safety device, which can easily cause accidental triggering. Utility Model Content

[0007] In view of this, the problem to be solved by the present invention is to provide a blood sampling device which can prevent mis-triggering.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0009] A blood sampling device capable of preventing false triggering, comprising:

[0010] The steel needle protection tube, the excitation cap and the outer shell are set from the inside to the outside;

[0011] The front and rear parts of the steel needle protection tube are connected by a breakable part, the front part is provided with a top rib for abutting against the shell and thus limiting the downward movement of the steel needle protection tube, the steel needle is fixed in the rear part, and a guide rib is provided on the outer periphery of the rear part;

[0012] The end of the excitation cap is configured with a deformable pin, and a needle-out slot corresponding to the guide rib is formed between the deformable pins;

[0013] The shell is connected to the rear part of the steel needle protection tube through an elastic member, and a supporting body is also constructed inside the shell for supporting the downward deformable pin to thereby change the width of the needle insertion slot.

[0014] The end of the excitation cap is also configured with a strip-shaped hook foot, and the inner wall of the shell is configured with a slope corresponding to the strip-shaped hook foot.

[0015] The two groups of ramps are arranged in sequence along the axial direction of the shell.

[0016] The downward contact end surface between the supporting body and the deformable pin, and the downward contact end surface between the strip-shaped hook foot and the slope platform are mutually sloped.

[0017] The limiting end face opposite to the downward contact end face of the ramp and the limiting end face opposite to the downward contact end face of the strip hook foot are both planar structures.

[0018] A limiting rib is also constructed on the outer periphery of the rear portion, and a needle-exit depth limiting groove corresponding to the limiting rib is formed between adjacent strip-shaped hook feet.

[0019] The elastic member is a spring, and a spring fixing seat for fixing and connecting the spring is constructed on the bottom end of the rear portion and the inner bottom surface of the shell.

[0020] The axial cross-sectional area of ​​the steel needle protection tube decreases along the needle tip direction of the steel needle.

[0021] A hemispherical convex body is constructed on the needle outlet end surface of the excitation cap, and a plurality of the hemispherical convex bodies are arranged in a ring shape around the needle outlet on the excitation cap.

[0022] The front portion passes through the excitation cap and is clamped with a protection cap.

[0023] The advantages and positive effects of the utility model are:

[0024] (1) The front and rear parts are detachable. If the front part is not twisted off, when the trigger cap is accidentally touched by external force and the steel needle protection tube moves downward, the top rib of the front part will abut against the downward limit stopper in the inner cavity of the shell, thereby limiting the downward movement of the steel needle protection tube and preventing the steel needle from popping out.

[0025] (2) The device is composed of only five components: a steel needle protection tube, an excitation cap, a housing, a spring, and a protection cap. The protection cap can be further omitted, thereby simplifying the structure and facilitating assembly, thereby greatly reducing the manufacturing cost.

[0026] (3) After the steel needle is launched, the spacing between the bar-shaped hook feet remains at the width opened by the supporting body, so that the excitation cap can no longer push the guide bar through the needle outlet groove to drive the rear of the steel needle protective tube downward, that is, the steel needle can no longer be launched by driving the rear compression spring, thus avoiding the secondary use of the blood collection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1This is a structural diagram of a blood sampling device capable of preventing accidental triggering of the utility model, with the protective cap hidden behind it;

[0029] Figure 2 It is an exploded view of a steel needle protection tube and an excitation cap in a blood sampling device capable of preventing mis-triggering of the utility model;

[0030] Figure 3 This is a structural diagram of a steel needle protection cylinder in a blood sampling device capable of preventing mis-triggering according to the utility model;

[0031] Figure 4 It is a cross-sectional view of a shell of a blood sampling device capable of preventing mis-triggering according to the utility model;

[0032] Figure 5 This is a structural diagram of a shell in a blood sampling device capable of preventing false triggering according to the utility model;

[0033] Figure 6 This is an overall structural diagram of a blood sampling device capable of preventing false triggering according to the utility model;

[0034] In the figure:

[0035] Steel needle protection tube 1, steel needle 11, guide rib 12, front part 13, rear part 14, top rib 15, breakable part 16, limiting rib 17, excitation cap 2, deformable pin 21, needle outlet slot 22, bar hook foot 23, needle outlet depth limiting slot 24, hemispherical protrusion 25, shell 3, support body 31, downward limiting stopper 32, ramp 33, spring 4, protection cap 5, clamping part 51, semi-cylindrical abutment part 52. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] like Figures 1 to 5 As shown, the utility model provides a blood sampling device capable of preventing false triggering, comprising:

[0040] The steel needle protection tube 1, the excitation cap 2 and the outer shell 3 are arranged from the inside to the outside;

[0041] The steel needle protection tube 1 comprises a front portion 13 and a rear portion 14, the front portion 13 and the rear portion 14 are detachably arranged, the front portion 13 and the rear portion 14 are connected via a breakable portion 16, the bottom of the steel needle 11 is fixedly connected to the bottom end of the rear portion 14, in this embodiment, the breakable portion 16 is a fragile plastic, and a top rib 15 is constructed on the front portion 13, when the excitation cap 2 is accidentally touched by an external force and drives the steel needle protection tube 1 to move downward, the top rib 15 abuts against the downward limit stopper 32 in the inner cavity of the shell 3, thereby limiting the downward movement of the steel needle protection tube 1, preventing the downward movement of the steel needle protection tube 1 from compressing the elastic member at the bottom of the shell 3, causing the steel needle 11 to pop out;

[0042] The end of the excitation cap 2 is configured with a deformable pin 21, and the outer periphery of the rear portion is configured with a guide rib 12, and a needle outlet slot 22 corresponding to the guide rib 12 is formed between the deformable pins 21, and the housing 3 is connected to the rear portion 14 of the steel needle protection tube 1 through an elastic member, and a supporting body 31 for supporting the downward deformable pin 21 is also configured in the housing 3;

[0043] Since the rear portion 14 is connected to the shell 3, when the front portion 13 is axially screwed, the rear portion is limited by the shell 3 and generates a reaction force, so that the fragile plastic with relatively weak structural strength is broken, the front portion 13 and the rear portion 14 are separated, and the needle head of the steel needle 11 is exposed from the rear portion 14. At this time, the top rib 15 is separated from the blood collection device together with the front portion 13, and the downward movement of the excitation cap 2 is no longer restricted, and then the needle outlet groove 22 abuts against the guide rib 12 to drive the rear portion 14 downward, thereby squeezing the space between the rear portion 14 and the bottom of the shell 3. The elastic member realizes the energy storage effect. When the deformable pin 21 moves downward to abut the supporting body 31, the supporting body 31 continuously abuts the deformable pin 21, so that the distance between the two groups of deformable pins 21 continues to increase, that is, the width of the needle outlet slot 22 continues to increase. When the width of the needle outlet slot 22 is greater than the width of the rib 12, the guide rib 12 is no longer abutted by the needle outlet slot 22, and the elastic member opens, pushing the guide rib 12 to penetrate the needle outlet slot 22 and the rear part 14 to penetrate the excitation cap 2 to push the steel needle 11 to the outside of the excitation cap 2.

[0044] Specifically, the end of the excitation cap 2 is also configured with a strip hook foot 23, and the inner wall of the shell 3 is configured with a slope platform 33 corresponding to the strip hook foot 23, and the slope platform 33 and the limiting end surface opposite to the downward contact end surface of the strip hook foot 23 are both plane structures, and the downward contact end surfaces of the support body 31 and the deformable pin 21, the strip hook foot 23 and the slope platform 33 are mutually sloped, and two groups of the slope platforms 33 are arranged in sequence along the axial direction of the shell 3, that is, the first group is arranged close to the excitation cap 2, and the second group is arranged away from the excitation cap 2;

[0045] When the excitation cap 2 is in an untriggered state, one group of the bar hook feet 23 is located on the inner side of the ramp 33 closest to the excitation cap 2. Since the back of the bar hook feet 23 is a flat structure, the bar hook feet 23 cannot be pulled out of the housing 3, thus preventing the excitation cap 2 from being separated from the housing 3 after the blood sampling device is assembled.

[0046] When the excitation cap 2 is in the triggered state, the strip hook feet 23 are driven downward, and under the guidance of the slope, another group of strip hook feet 23 passes over the lowest slope platform 33. Since the back of the strip hook feet 23 is a flat structure, the strip hook feet 23 are blocked and cannot return, so the distance between the strip hook feet 23 is maintained at the width opened by the supporting body 31, that is, the width of the needle outlet slot 22 is kept larger than the width of the guide rib 12, so that the excitation cap 2 can no longer push the guide rib 12 through the needle outlet slot 22 to drive the rear part 14 of the steel needle protection tube 1 downward, that is, it can no longer drive the rear part 14 to compress the elastic member to launch the steel needle 11, thereby avoiding the secondary use of the blood collection device.

[0047] Specifically, a limiting rib 17 is also constructed on the outer periphery of the rear portion, and a needle-exit depth limiting groove 24 corresponding to the limiting rib 17 is formed between adjacent bar-shaped hook feet 23;

[0048] When the elastic member opens, the elastic member pushes the guide rib 12 to pass through the needle outlet slot 22 and the rear portion 14 to pass through the excitation cap 2 and extend to the outside of the excitation cap 2 until the limiting rib 17 abuts against the needle outlet depth limiting slot 24, thereby limiting the needle outlet depth of the steel needle 11.

[0049] Specifically, the elastic member is a spring 4 , and a spring fixing seat 41 for fixing and connecting the spring 4 is constructed on the bottom end of the rear portion 14 and the inner bottom surface of the housing 3 .

[0050] Specifically, the axial cross-sectional area of ​​the steel needle protection tube 1 decreases along the needle tip direction of the steel needle 11 , thereby being able to cover the steel needle 11 .

[0051] like Figure 1 and Figure 6As shown, specifically, a hemispherical convex body 25 is constructed on the needle outlet end surface of the excitation cap 2, and a plurality of the hemispherical convex bodies 25 are arranged in a ring around the needle outlet on the excitation cap 2;

[0052] The hemispherical convex body 25 abuts against the human skin, allowing the user to feel the area where blood is to be drawn. During blood drawing, the hemispherical convex bodies 25 arranged in a ring squeeze the skin area around the needle hole to increase the amount of bleeding, facilitating subsequent sample liquid collection.

[0053] Specifically, the front portion 13 passes through the excitation cap 2 and is clamped with a protective cap 5. The protective cap 5 can increase the force-bearing area of ​​the front portion 13 of the steel needle protection tube 1, so that users with less strength can also use the blood collection device while taking into account a certain aesthetic effect.

[0054] Specifically, the portion of the front portion 13 located inside the protective cap 5 is a strip-shaped structure, and includes a snap-on portion 51 and a semi-cylindrical abutment portion 52 in sequence along the direction approaching the excitation cap 2. The snap-on portion 51 is used to connect the protective cap 5, and the semi-cylindrical abutment portion 52 is used to narrow the gap between the protective cap 5 and the front portion 13 to avoid shaking when the front portion 13 is axially screwed.

[0055] The working principle and working process of the utility model are as follows:

[0056] When blood is not collected, the front portion 13 and the rear portion 14 of the steel needle protection tube 1 are in an integrated state. When the trigger cap 2 is accidentally touched by an external force and drives the steel needle protection tube 1 to move downward, the top rib 15 abuts against the downward limit stopper in the inner cavity of the shell 3, thereby limiting the downward movement of the steel needle protection tube 1 and preventing the downward movement of the steel needle protection tube 1 from compressing the elastic member at the bottom of the shell 3;

[0057] When blood sampling is required, the front part 13 is axially screwed, and the fragile plastic with a relatively fragile structure is broken, so that the front part 13 is separated from the rear part 14, and the needle head of the steel needle 11 is exposed from the rear part 14. At this time, the top rib 15 is separated from the blood collector together with the front part 13, and the downward movement of the excitation cap 2 is no longer restricted. The excitation cap 2 is pressed, and the excitation cap 2 drives the deformable pin 21 downward, so that the needle outlet slot 22 is inserted into the guide rib 12 to drive the rear part 14 downward, thereby squeezing the spring 4 between the rear part 14 and the bottom of the shell 3 to realize the energy storage effect. When the deformable pin 21 moves downward, the spring 4 between the rear part 14 and the bottom of the shell 3 is squeezed to realize the energy storage effect. When abutting the supporting body 31, the supporting body 31 continuously abuts the deformable pins 21 so that the distance between the two groups of deformable pins 21 continuously increases, that is, the width of the needle outlet slot 22 continuously increases. When the width of the needle outlet slot 22 is greater than the width of the rib 12, the guide rib 12 is no longer abutted by the needle outlet slot 22, and the elastic member opens, pushing the guide rib 12 to penetrate the needle outlet slot 22, and the rear part 14 to penetrate the excitation cap 2 to push the steel needle 11 to the outside of the excitation cap 2 for blood collection, and then the spring 4 is restored to its original shape, and the steel needle 11 is pulled back into the outer shell 3 through the rear part 14.

[0058] The above embodiments of the utility model are described in detail, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the utility model should still fall within the scope of this patent.

Claims

1. A blood sampling device capable of preventing false triggering, characterized in that: include: A steel needle protection tube (1), an excitation cap (2), and a housing (3) are arranged from inside to outside; The front part (13) and the rear part (14) of the steel needle protection tube (1) are connected via a breakable part (16); the front part (13) is provided with a top rib (15) for abutting against the housing (3) and thus limiting the downward movement of the steel needle protection tube (1); the steel needle (11) is fixed in the rear part (14); and a guide rib (12) is provided on the outer periphery of the rear part; The end of the excitation cap (2) is provided with a deformable pin (21), and a needle-out slot (22) corresponding to the guide rib (12) is formed between the deformable pins (21); The shell (3) is connected to the rear portion (14) of the steel needle protection tube (1) via an elastic member, and a supporting body (31) is also constructed inside the shell (3) for supporting the downwardly moving deformable pin (21) and thereby changing the width of the needle insertion slot (22).

2. A blood sampling device capable of preventing false triggering according to claim 1, characterized in that: The end of the excitation cap (2) is also configured with a strip-shaped hook foot (23), and the inner wall of the housing (3) is configured with a slope (33) corresponding to the strip-shaped hook foot (23).

3. A blood sampling device capable of preventing false triggering according to claim 2, characterized in that: The two groups of ramps (33) are arranged in sequence along the axial direction of the housing (3).

4. A blood sampling device capable of preventing false triggering according to claim 3, characterized in that: The downward contact end surfaces of the supporting body (31) and the deformable pin (21), and the downward contact end surfaces of the strip-shaped hook foot (23) and the slope platform (33) are all mutually sloped.

5. A blood sampling device capable of preventing false triggering according to claim 4, characterized in that: The limiting end surface facing away from the downward contact end surface of the ramp (33) and the limiting end surface facing away from the downward contact end surface of the strip hook foot (23) are both planar structures.

6. A blood sampling device capable of preventing false triggering according to claim 5, characterized in that: A limiting rib (17) is also constructed on the outer periphery of the rear portion, and a needle-exit depth limiting groove (24) corresponding to the limiting rib (17) is formed between adjacent strip-shaped hook feet (23).

7. A blood sampling device capable of preventing false triggering according to claim 6, characterized in that: The elastic member is a spring (4), and a spring fixing seat (41) for fixing and connecting the spring (4) is constructed on the bottom end of the rear portion (14) and the inner bottom surface of the outer shell (3).

8. A blood sampling device capable of preventing false triggering according to claim 7, characterized in that: The axial cross-sectional area of ​​the steel needle protection tube (1) decreases along the needle tip direction of the steel needle (11).

9. A blood sampling device capable of preventing false triggering according to claim 8, characterized in that: A hemispherical convex body (25) is constructed on the needle outlet end surface of the excitation cap (2), and a plurality of the hemispherical convex bodies (25) are arranged in a ring shape around the needle outlet opening on the excitation cap (2).

10. A blood sampling device capable of preventing false triggering according to claim 9, characterized in that: The front portion (13) penetrates the excitation cap (2) and is clamped with a protection cap (5).

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