CN220938056U - Blood taking needle - Google Patents

Abstract

The utility model relates to a blood taking needle, belongs to the technical field of medical instruments, and solves the technical problems that a blood taking unit and a protective sleeve can be separated only by simultaneous operation of two hands during blood taking, the operation is inconvenient, and the risk of stabbing an operator exists. A blood collection needle includes a needle body having a needle end and a grip end. The installation sleeve is sleeved outside the needle end. The protective sleeve is rotatably arranged on the mounting sleeve, and an opening facing the needle end is formed in the protective sleeve. The protective sleeve rotates in a direction approaching the needle end so that the needle end enters the protective sleeve through the opening. The first buckle is installed in the protective sleeve. The cassette is installed on the installation cover, and the protective sheath rotates in order to make first buckle joint on the cassette to the direction that is close to the needle end. The sliding frame is slidably mounted on the mounting sleeve and is provided with a guide surface which corresponds to and abuts against the first buckle. The sliding frame moves towards the direction close to the first buckle so that the first buckle slides out of the clamping seat.

Description

Blood taking needle

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a blood taking needle.

Background

At present, the blood taking needle structure in the market mainly comprises a needle tube, a needle seat, a flow stopping sleeve, a lancing sheath and other components. In order to prevent the needle from being exposed, a protective sleeve is generally added on the needle seat to cover the needle, so that the needle is prevented from being broken and hurt people.

The applicant has mentioned in the patent entitled safety integrated blood taking needle with publication number CN208541313U by searching that a safety integrated blood taking needle comprises a blood taking unit and a needle tube protecting sleeve, wherein the blood taking unit and the needle tube protecting sleeve are integrated, and the needle tube protecting sleeve can be folded and can at least accommodate the needle head of the needle tube in the blood taking unit after folding to realize needle head protection.

However, the inventors have found that the prior art, represented by the above patents, still has the following problems during production and use:

When blood is collected, the blood collection unit and the protective sleeve can be separated only by simultaneous operation of both hands, so that the operation is inconvenient, and the risk of stabbing operators is brought.

Disclosure of utility model

The utility model provides a blood taking needle which is used for solving the technical problems that in the prior art, when the blood taking needle is used, a blood taking unit and a protective sleeve can be separated only by simultaneous operation of two hands, the operation is inconvenient, and the risk of stabbing an operator exists.

In order to achieve the above purpose, the present utility model is realized by the following technical scheme: a blood taking needle comprises a needle body, a mounting sleeve, a protective sleeve, a first buckle, a clamping seat and a sliding frame. The needle body has a needle end and a grip end. The installation sleeve is sleeved outside the needle end. The protective sleeve is rotatably arranged on the mounting sleeve, and an opening facing the needle end is formed in the protective sleeve. The protective sleeve rotates in a direction approaching the needle end so that the needle end enters the protective sleeve through the opening. The first buckle is installed in the protective sleeve. The cassette is installed on the installation cover, and the protective sheath rotates in order to make first buckle joint on the cassette to the direction that is close to the needle end. The sliding frame is slidably mounted on the mounting sleeve and is provided with a guide surface which corresponds to and abuts against the first buckle. The sliding frame moves towards the direction close to the first buckle so that the first buckle slides out of the clamping seat.

Through the structure, the blood taking needle provided by the utility model can enable an operator to separate the protective sleeve from the needle head end of the needle body by one hand, so that the operation is simpler and more convenient, and the condition that the needle body is stabbed to the operator is prevented. In particular, the needle end is positioned within the protective sheath when in a standby state to prevent stabbing the operator when removed. When the blood taking needle needs to be used, an operator can wind the periphery of the sliding frame away from the installation sleeve by using the index finger of any hand, wind the middle finger, the ring finger and the little finger outside the holding end to fix the needle body, then press the sliding frame by using the abdomen of the thumb to enable the sliding frame to move towards the direction close to the first buckle, further enable the guide face to move towards the direction close to the first buckle, enable the first buckle to elastically deform, further slide out from the clamping seat and not be clamped with the clamping seat, and enable the protective sleeve to rotate towards the direction away from the installation sleeve, and enable the needle end to leave the protective sleeve through the opening.

Thus, an operator can separate the needle end and the protection end by means of a single hand, so that the separation operation of the needle end and the protection end is simpler and more convenient, and meanwhile, the risk of the needle end injuring the operator is reduced because the finger is always positioned close to the holding end in the separation process.

Optionally, the mounting sleeve comprises a mounting plate, a first sleeve and a second sleeve. The mounting panel cover is established outside the syringe needle end, and the protective sheath rotates to be installed on the mounting panel edge of keeping away from the syringe needle end. The first sleeve is arranged on the side surface of the mounting plate far away from the holding end and sleeved outside the needle end. The second sleeve is mounted on the end face of the first sleeve remote from the mounting plate. Two sliding grooves respectively corresponding to the two opposite sides of the sliding frame are formed in the end face, facing the first sleeve, of the second sleeve. The sliding frame is slidably arranged on the second sleeve through two sliding grooves and sleeved outside the needle head end.

Optionally, the socket includes a first upright and a second upright. Two first posts are mounted on the mounting plate and are located between the protective sleeve and the first sleeve. The second upright is mounted on the mounting plate and is located between the two first uprights. Two channels are respectively formed between the second upright post and the two first upright posts. The first buckles are two mutually parallel, and the protective sleeve rotates towards the direction close to the needle end, so that the two first buckles are driven to respectively penetrate through the two channels and are respectively clamped on the side faces of the two first upright posts, which face the first sleeve.

Optionally, the sliding frame comprises a mounting frame and a wedge. The mounting frame is provided with an opening end and a sealing end which are oppositely arranged. The sealing end is positioned outside the side surface of the second sleeve pipe, which is far away from the first upright post, and the opening end penetrates through the sliding groove and is positioned between the second sleeve pipe and the first upright post. Two wedge blocks are mounted on both sides of the open end, respectively. The two wedge blocks are provided with guide surfaces, and the distance between the guide surfaces of the two wedge blocks is gradually increased along the direction close to the first buckle.

Optionally, the two wedge blocks are located between the first upright and the first sleeve, the first buckle is clamped on the side surface of the first upright, which faces the first sleeve, so as to be in butt joint with the guide surface, and one end, away from the first buckle, of the wedge block is in butt joint with the outer periphery side of the second sleeve. The design makes when first buckle joint is on the cassette, under the effect that does not have the external force, the slip frame can be fixed for the installation cover.

Optionally, the sliding frame further includes a second buckle. The two second buckles are respectively arranged on two sides of the opening end and are respectively positioned below the two wedge-shaped blocks. The side surfaces of the two first upright posts, which face each other, are respectively provided with clamping grooves corresponding to the two second buckles. The mounting frame moves towards the direction close to the first upright post so that the wedge-shaped block is abutted with the side surface of the first upright post, which faces the first sleeve, and the second buckle is clamped in the clamping groove. The design of the second buckle enables the sliding frame to be fixed relative to the mounting sleeve and the clamping seat under the action of no external force after the wedge-shaped block ejects the first buckle out of the clamping seat.

Optionally, the needle body comprises a syringe and a puncture needle. The syringe has a gripping end. The puncture needle is provided with a needle end, and the mounting plate is sleeved outside the puncture needle and is close to the injector.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a lancet according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a lancet according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a cross-sectional view taken along the path B1-B1 in FIG. 2;

FIG. 5 is a cross-sectional view taken along the path C1-C1 of FIG. 2;

fig. 6 is a schematic structural diagram of a protective sleeve according to an embodiment of the present utility model;

FIG. 7 is an exploded view of a mounting sleeve provided in an embodiment of the present utility model;

Fig. 8 is a schematic structural diagram of a card holder according to an embodiment of the present utility model;

fig. 9 is a schematic structural diagram of a sliding frame according to an embodiment of the present utility model;

FIG. 10 is a schematic view of a lancet at a second station according to an embodiment of the present utility model;

FIG. 11 is an enlarged view at D in FIG. 10;

FIG. 12 is a cross-sectional view taken along the path B2-B2 in FIG. 10;

Fig. 13 is a cross-sectional view taken along the path C2-C2 in fig. 10.

In the figure:

1-a needle body; 101-needle end; 102-a grip end; 11-a syringe; 12-puncture needle; 2-mounting a sleeve; 21-a mounting plate; 22-a first sleeve; 23-a second sleeve; 231-chute; 3-protecting sleeve; 31-opening; 4-a first buckle; 5-a clamping seat; 501-channel; 502-a clamping groove; 51-a first upright; 52-a second upright; 6-sliding frame; 61-mounting a frame; 611-sealing the end; 612—an open end; 62-wedge blocks; 621-a guide surface; 63-second catch.

Detailed Description

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Examples

The applicant has mentioned in the patent entitled safety integrated blood taking needle with publication number CN208541313U by searching that a safety integrated blood taking needle comprises a blood taking unit and a needle tube protecting sleeve 3, wherein the blood taking unit and the needle tube protecting sleeve 3 are integrated, the needle tube protecting sleeve 3 can be folded and can at least hold the needle head of the needle tube in the blood taking unit after folding to realize needle head protection.

However, the inventors have found that the prior art, represented by the above patents, still has the following problems during production and use:

The blood sampling unit and the protective sleeve 3 can be separated only by simultaneous operation of both hands during blood sampling, the operation is inconvenient, and the risk of stabbing operators exists.

In order to solve the above technical problems, the present embodiment provides a lancet. A lancet, as shown in fig. 1, 2 and 3, includes a needle body 1, a mounting sleeve 2, a protective sheath 3, a first clip 4, a cartridge 5 and a sliding frame 6. The needle body 1 has a needle end 101 and a grip end 102 as shown in fig. 1. The mounting sleeve 2 is sleeved outside the needle end 101. The protective sheath 3 is rotatably mounted on the mounting sleeve 2, and an opening 31 facing the needle end 101 is provided in the protective sheath 3. The protective sheath 3 is rotated in the direction W1 toward the needle end 101 as shown in fig. 1 to allow the needle end 101 to enter the protective sheath 3 through the opening 31. As shown in fig. 6, the first buckle 4 is installed in the protective cover 3, and it should be noted that the protective cover 3 and the first buckle 4 are manufactured by using medical grade Polyethylene (Polyethylene) and an integral molding process. The other end of the first buckle 4 extends towards the direction approaching the opening 31 and extends out of the protective sleeve 3. The cartridge 5 is mounted on the mounting sleeve 2 as shown in fig. 1. As shown in fig. 3, the protective sleeve 3 rotates along the direction W1 toward the needle end 101 to make the first buckle 4 clamped on the card seat 5. The slide frame 6 is slidably mounted on the mounting sleeve 2 as shown in fig. 1, and the slide frame 6 has a guide surface 621 corresponding to and abutting the first buckle 4 as shown in fig. 3. As shown in fig. 12, the sliding frame 6 moves in the direction of N1 toward the first buckle 4, so that the first buckle 4 slides out of the card seat 5 in the direction of W2.

Through the structure, the blood taking needle provided by the embodiment can enable an operator to separate the protective sleeve 3 from the needle end 101 of the needle body 1 by one hand, so that the operation is simpler and more convenient, and the condition that the needle body 1 punctures the operator is prevented. Specifically, when in the standby state, the protective sheath 3 is rotated in the direction of W1 toward the needle end 101 as shown in fig. 3 to cause the first buckle 4 to be engaged with the holder 5, so that the protective sheath 3 is fixed with respect to the mounting sheath 2, and the needle end 101 is positioned in the protective sheath 3 as shown in fig. 2, to prevent stabbing of the operator when taken out.

When the blood taking needle is required to be used, an operator can wind the index finger of any hand around the periphery of the mounting sleeve 2 far away from the sliding frame 6, and wind the middle finger, the ring finger and the little finger around the holding end 102 to fix the needle body 1. The sliding frame 6 is then pressed in the direction N2 with the thumb's abdomen as shown in fig. 12 to move the sliding frame 6 in the direction N2 toward the first buckle 4, and further to move the guide surface 621 in the direction N2 toward the first buckle 4 to elastically deform the first buckle 4. As shown in fig. 11, the slide-out device slides out of the clamping seat 5 and is not clamped with the clamping seat 5 any more. As shown in fig. 10, so that the protective sheath 3 is rotated in the direction W2 away from the mounting sheath 2, so that the needle end 101 leaves the protective sheath 3 through the opening 31.

Thus, an operator can separate the needle end 101 from the protecting end by means of a single hand, so that the separation operation of the needle end 101 and the protecting end is simpler and more convenient, and meanwhile, the risk of the needle end 101 injuring the operator is reduced because the fingers are always positioned close to the holding end 102 in the separation process.

Based on the above, in order to enable the sliding frame 6 to be slidably mounted on the mounting sleeve 2. The mounting sleeve 2 as shown in fig. 7 comprises a mounting plate 21, a first sleeve 22 and a second sleeve 23. It should be noted that the first sleeve 22, the mounting plate 21 and the protective sheath 3 are made of medical grade Polyethylene (Polyethylene) and are manufactured by an integral molding process. The mounting plate 21 is sleeved outside the needle end 101, and the protective sleeve 3 is connected to the edge of the mounting plate 21 far away from the needle end 101 in a folding way and can rotate relative to the mounting plate 21. The first sleeve 22 is located on the side of the mounting plate 21 remote from the grip end 102 and is positioned over the needle end 101. The second sleeve 23 is mounted on the end face of the first sleeve 22 remote from the mounting plate 21. The end surface of the second sleeve 23 facing the first sleeve 22 is provided with two sliding grooves 231 corresponding to two opposite sides of the sliding frame 6. As shown in fig. 4 and 12, the extending direction of the chute 231 is parallel to the N1 direction and the N2 direction. The sliding frame 6 is slidably mounted on the second sleeve 23 through two sliding grooves 231 and sleeved outside the needle end 101. Thus, the slide frame 6 reciprocates in the N1 direction and the N2 direction with respect to the slide groove 231 as shown in fig. 3 and 11, and reciprocates in the N1 direction and the N2 direction with respect to the mount sleeve 2 as shown in fig. 4 and 12.

Based on the above, in order to enable the first clasp 4 to be snapped onto the holder 5. The cartridge 5 as shown in fig. 8 includes a first upright 51 and a second upright 52. Two first uprights 51 are mounted on the mounting plate 21 and are located between the protective sheath 3 and the first sleeve 22. The second upright 52 is mounted on the mounting plate 21 and is located between the two first uprights 51. Two channels 501 are formed between the second pillar 52 and the two first pillars 51, respectively. The first buckle 4 is formed by two mutually parallel buckles. Thus, as shown in fig. 4, the protective sleeve 3 rotates along the direction W1 toward the direction approaching the needle end 101, so as to drive the two first buckles 4 to respectively pass through the two channels 501 and respectively connect to the sides of the two first upright posts 51 facing the first sleeve 22 in a clamping manner. So that the protective sheath 3 is fixed relative to the mounting plate 21.

Based on the above-described basis. The slide frame 6 includes a mounting frame 61 and a wedge block 62 as shown in fig. 9. The mounting frame 61 has oppositely disposed open 31 and closed 611 ends. The sealed end 611 is located outside the side of the second sleeve 23 remote from the first post 51 as shown in fig. 4 and 5, and the open end 31 extends through the chute 231 and is located between the second sleeve 23 and the first post 51. Two wedge blocks 62 are mounted on either side of the open end 31. As shown in fig. 9, the two wedge blocks 62 each have a guide surface 621 thereon, and the distance between the guide surfaces 621 of the two wedge blocks 62 gradually increases in a direction approaching the first buckle 4. Specifically, as shown in fig. 12, when the mounting frame 61 drives the wedge blocks 62 to move along the direction N2 toward the direction approaching the first upright post 51, the guide surfaces 621 on the two wedge blocks 62 also move along the direction N2 toward the direction approaching the first buckles 4, so that the two first buckles 4 are elastically deformed in the directions approaching each other, and the two first buckles 4 are not clamped with the side surface of the first upright post 51 toward the first sleeve 22, and slide out from the channel 501 along the direction W2, as shown in fig. 10, so that the protective sleeve 3 rotates along the direction W2 toward the direction away from the needle end 101.

Based on the above, in order to prevent the slide frame 6 from sliding in the N1 direction and the N2 direction with respect to the protective sheath 3 when in use. As shown in fig. 4, the two wedge blocks 62 are located between the first upright 51 and the first sleeve 22, and the first buckle 4 is clamped on the side surface of the first upright 51 facing the first sleeve 22 so as to be abutted with the guide surface 621, and the end of the wedge block 62 away from the first buckle 4 is abutted with the outer peripheral side of the second sleeve 23. Thus, when the first buckle 4 is clamped on the clamping seat 5, the sliding frame 6 can be fixed relative to the mounting sleeve 2 under the action of no external force.

Based on the above-described basis, in order to prevent the slide frame 6 from sliding in the N1 direction and the N2 direction with respect to the protective sheath 3 when the lancet is used. The sliding frame 6 also comprises a second catch 63 as shown in fig. 9. Two second snaps 63 are mounted on either side of the open end 31 as shown in fig. 9, and are located below the two wedge blocks 62, respectively. As shown in fig. 5 and 8, the two first posts 51 are provided with grooves 502 corresponding to the two second hooks 63 on the side surfaces facing each other. Specifically, as shown in fig. 12, the mounting frame 61 is moved in a direction approaching the first pillar 51 in the N2 direction, so that the wedge 62 abuts against the side of the first pillar 51 toward the first sleeve 22 to prevent the mounting frame 61 from continuing to move in the N2 direction. As shown in fig. 13, the second buckle 63 is engaged in the slot 502 to prevent the mounting frame 61 from moving in the N1 direction. In this way, after the wedge 62 pushes the first buckle 4 out of the clamping seat 5, the sliding frame 6 can be fixed relative to the mounting sleeve 2 and the clamping seat 5 without the action of external force.

Meanwhile, in the process of clamping the second buckle 63 with the clamping groove 502, the two second buckles 63 drive the opposite sides of the clamping ends to elastically deform in the direction of approaching each other, so that the two guide surfaces 621 move in the direction of approaching each other, the distance between the two guide surfaces 621 is shortened, the distance between the two first buckles 4 is shortened, and the two first buckles 4 slide out of the channel 501 more easily to be not clamped with the clamping seat 5.

Based on the above-described basis. The needle body 1 shown in fig. 10 includes a syringe 11 and a puncture needle 12. The syringe 11 has a gripping end 102. The puncture needle 12 has a needle end 101, and the mounting plate 21 is sleeved outside the puncture needle 12 and is close to the syringe 11.

To sum up, when in the standby state, the protective sleeve 3 rotates along the direction W1 towards the direction approaching the needle end 101 as shown in fig. 3, so that the first buckle 4 is clamped on the clamping seat 5, so that the protective sleeve 3 is fixed relative to the mounting sleeve 2, and the needle end 101 is located in the protective sleeve 3 as shown in fig. 2, so as to prevent the operator from being stabbed when the protective sleeve is taken out. Meanwhile, as shown in fig. 4, the first buckle 4 is clamped on the side surface of the first upright 51 facing the first sleeve 22 to be abutted against the guide surface 621, and one end of the wedge block 62 away from the first buckle 4 is abutted against the outer periphery side of the second sleeve 23, so that the sliding frame 6 can be fixed relative to the mounting sleeve 2.

When the lancet is required to be used, the operator can use the index finger of one hand to wind around the outer side of the circumference of the mounting sleeve 2 far from the sliding frame 6, and use the middle finger, the ring finger and the little finger to wind around the outer side of the injector 11 to fix the needle body 1. The sealing end 611 is then pressed with the thumb's abdomen in the direction N2 as shown in fig. 12, so that the mounting frame 61 is moved in the direction of approaching the first catches 4 in the direction N2, and the guide surfaces 621 on the two wedge-shaped blocks 62 are moved in the direction of approaching the first catches 4 in the direction N2, so that the two first catches 4 are elastically deformed in the directions of approaching each other. As shown in fig. 11, the slide-out device slides out of the clamping seat 5 and is not clamped with the clamping seat 5 any more. As shown in fig. 10, so that the protective sheath 3 is rotated in the direction W2 away from the mounting sheath 2, so that the needle end 101 leaves the protective sheath 3 through the opening 31. At the same time, as shown in fig. 12, the mounting frame 61 moves toward the first pillar 51 in the direction N2, so that the wedge 62 abuts against the side of the first pillar 51 toward the first sleeve 22 to prevent the mounting frame 61 from continuing to move in the direction N2. As shown in fig. 13, the second buckle 63 is engaged in the slot 502 to prevent the mounting frame 61 from moving in the N1 direction. In this way, after the wedge 62 pushes the first buckle 4 out of the clamping seat 5, the sliding frame 6 can be fixed relative to the mounting sleeve 2 and the clamping seat 5 without the action of external force. So that the sliding frame 6 does not affect the user when taking blood. And when the second buckle 63 and the clamping groove 502 are clamped, the two second buckles 63 drive the opposite sides of the buckling end to elastically deform in the direction of approaching each other, so that the two guide surfaces 621 move in the direction of approaching each other, the distance between the two guide surfaces 621 is shortened, the distance between the two first buckles 4 is shortened, and the two first buckles 4 slide out of the channel 501 more easily to be not clamped with the clamping seat 5.

According to the above, when the blood taking needle is needed, an operator can separate the needle end 101 from the protecting end by means of a single hand, so that the separation operation of the needle end 101 and the protecting end is simpler and more convenient, and meanwhile, as the fingers are always positioned close to the holding end 102 in the separation process, the risk of the needle end 101 injuring the operator is reduced, and the sliding frame 6 is fixed relative to the mounting sleeve 2 no matter the blood taking of the operator is needed and used. Therefore, the blood taking needle provided by the embodiment can separate the protective sleeve 3 from the needle end 101 of the needle body 1 by one hand of an operator, so that the operation is simpler and more convenient, and the condition that the needle body 1 punctures the operator is prevented.

The above description is merely an embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present utility model, and it is intended to cover the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (7)

1. A lancet, comprising:

the needle body is provided with a needle end and a holding end;

The mounting sleeve is sleeved outside the needle head end;

The protective sleeve is rotatably arranged on the mounting sleeve, an opening facing the needle end is formed in the protective sleeve, and the protective sleeve rotates in a direction approaching the needle end so that the needle end enters the protective sleeve through the opening;

The first buckle is arranged in the protective sleeve;

The clamping seat is arranged on the mounting sleeve, and the protective sleeve rotates towards the direction close to the needle end so that the first buckle is clamped on the clamping seat;

The sliding frame is slidably mounted on the mounting sleeve and provided with a guide surface which corresponds to and abuts against the first buckle, and the sliding frame moves towards the direction close to the first buckle so that the first buckle slides out of the clamping seat.

2. The lancet of claim 1, wherein the mounting hub comprises:

The mounting plate is sleeved outside the needle end, and the protective sleeve is rotatably mounted on the edge of the mounting plate far away from the needle end;

The first sleeve is arranged on the side surface of the mounting plate, which is far away from the holding end, and is sleeved outside the needle head end;

The second sleeve is arranged on the end face, far away from the mounting plate, of the first sleeve, two sliding grooves corresponding to two opposite sides of the sliding frame are formed in the end face, facing the first sleeve, of the second sleeve, the sliding frame is slidably arranged on the second sleeve through the two sliding grooves, and the sliding frame is sleeved outside the needle end.

3. The lancet of claim 2, wherein the cartridge comprises:

Two first upright posts are arranged on the mounting plate and are positioned between the protective sleeve and the first sleeve;

The second stand is installed on the mounting plate and is located between the two first stands, two channels are formed between the second stand and the two first stands respectively, the first buckles are two mutually parallel, the protective sleeve rotates towards the direction close to the needle head end so as to drive the two first buckles to penetrate through the two channels respectively, and the two first stand faces the side face of the first sleeve respectively.

4. A lancet according to claim 3, wherein the sliding frame comprises:

The mounting frame is provided with an opening end and a sealing end which are oppositely arranged, the sealing end is positioned outside the side surface of the second sleeve pipe, which is far away from the first upright post, and the opening end penetrates through the sliding groove and is positioned between the second sleeve pipe and the first upright post;

The two wedge blocks are respectively arranged on two sides of the opening end, the two wedge blocks are respectively provided with the guide surfaces, and the distance between the guide surfaces of the two wedge blocks is gradually increased along the direction close to the first buckle.

5. The lancet of claim 4, wherein the two wedge blocks are located between the first upright and the first sleeve, and the first buckle is clamped on a side surface of the first upright facing the first sleeve so as to be abutted with the guide surface, and an end of the wedge block away from the first buckle is abutted with the outer peripheral side of the second sleeve.

6. The lancet of claim 5, wherein the sliding frame further comprises:

The two second buckles are respectively installed on two sides of the opening end and are respectively located below the two wedge blocks, clamping grooves corresponding to the two second buckles are respectively formed in the side faces of the two first upright posts, the installation frame moves towards the direction close to the first upright posts, the wedge blocks and the first upright posts face the side faces of the first sleeve in a butt mode, and the second buckles are clamped in the clamping grooves.

7. The lancet of claim 6, wherein the needle comprises:

A syringe having the grip end;

The puncture needle is provided with a needle head end, and the mounting plate is sleeved outside the puncture needle and is close to the injector.