Peripheral lancet
By incorporating components such as a syringe, needle hub, trigger, and fixing tube into the peripheral blood collection needle, the insertion depth of the puncture needle can be controlled, solving the problem of inaccurate control in existing technologies and achieving the effects of reducing pain and lowering production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU LINHWA MEDICAL DEVICES CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-31
AI Technical Summary
Existing peripheral blood collection needles cannot effectively control the insertion depth when dealing with different patients, leading to increased pain or enlarged wounds.
By incorporating components such as a syringe, needle hub, first elastic element, stop plate, trigger element, and stop block into the distal blood collection needle, the stop plate is cut by the cutting part to control the movement distance of the needle hub, thereby limiting the insertion depth of the puncture needle, and the movement of the puncture needle is guided by the fixed tube to ensure stability.
It achieves precise control over the depth of the puncture needle, reduces patient pain, and prevents wound enlargement. At the same time, its simple structure reduces production costs and processing difficulty.
Smart Images
Figure CN224572751U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to a peripheral blood collection needle. Background Technology
[0002] A capillary lancet is a medical device used to quickly collect a small amount of blood from the fingertip, earlobe, or other areas. It is commonly used for blood glucose monitoring, blood typing, and routine blood screening. Its key features are ease of operation, minimal invasiveness, and rapid results, making it suitable for home testing or rapid screening in medical institutions.
[0003] Existing peripheral blood collection needles use a spring-loaded puncture needle to quickly insert the needle into the skin. After use, the needle automatically retracts or the tip is manually covered. This type of blood collection needle is only subject to elastic force when it is inserted. When the blood collection is done by different patients with different skin thicknesses, it is impossible to control the depth of insertion. For example, children's skin is thinner and the insertion depth is usually deeper. When the puncture depth is too deep, it will increase the pain or cause the wound to enlarge. Utility Model Content
[0004] To overcome the shortcomings of the prior art, this utility model provides a peripheral blood collection needle that can control the depth of needle insertion and reduce patient pain.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] This utility model discloses a peripheral blood collection needle, comprising:
[0007] A syringe having an opening;
[0008] A needle hub is disposed inside the syringe barrel, and a puncture needle is provided on the needle hub;
[0009] A first elastic element is disposed between the syringe and the needle seat, and the first elastic element applies a biasing force toward the needle seat to move in a first direction;
[0010] A stop plate is provided, which is connected to the inner wall of the syringe and the needle seat respectively to fix the needle seat;
[0011] A trigger element is movably inserted into the syringe. The trigger element has a through hole and a channel inside. The needle seat can move within the channel of the trigger element. The end of the trigger element facing the stop plate has a cutting part.
[0012] A stop block is inserted into the through hole of the trigger element. The stop block can move into the channel of the trigger element to prevent the needle seat from moving.
[0013] The peripheral blood collection needle provided in this application has a cutting part that can cut the stop plate in response to external pressure during use, causing the needle seat to move inside the channel under the biasing force of the first elastic element. Since a stop is set on the trigger element, the distance the needle seat moves can be limited when the puncture needle is inserted, thereby controlling the puncture depth of the puncture needle. When dealing with patients with thin skin, it can reduce patient pain and prevent wound enlargement. Moreover, the structure is simple, requiring only a syringe and a trigger element. After the puncture needle is placed inside the syringe and trigger element, it can be ejected by the first elastic element. The manufacturing and assembly methods are more convenient and faster, which can reduce production and processing costs.
[0014] Furthermore, the syringe contains a step with the stepped surface facing the trigger. One side of the stop plate is connected to the stepped surface, and the other side is connected to the needle seat. The step not only allows the stop plate to be more securely fixed inside the syringe, but also provides a support surface for the cutting part to cut the stop plate, making it easier for the cutting part to cut the stop plate.
[0015] Furthermore, the cutting portion extends from the first end of the trigger member in a second direction to form the cutting portion. When the trigger member moves relative to the syringe, the cutting portion disconnects the stop plate from the syringe. This causes the needle seat to be ejected under the biasing force of the first elastic member.
[0016] Furthermore, a first thread is provided within the through hole, and a second thread corresponding to the first thread is provided on the stop block. The stop block and the trigger are connected via the first thread and the second thread. This threaded connection structure is not only simple and easy to operate, but also convenient and quick to manufacture and assemble, thus reducing production and processing costs.
[0017] Furthermore, it also includes a connecting rod that passes through the syringe and connects to the stop block. The connecting rod is responsive to external pressure, causing the stop block to move into the channel of the trigger element. In use, medical personnel can rotate the connecting rod to control the spiral rotation of the stop block, thereby moving the stop block.
[0018] Furthermore, it also includes a fixing tube, which is disposed inside the trigger element. The fixing tube has a hole inside it, which communicates with the outside of the trigger element, allowing the puncture needle to move within the hole. The fixing tube guides the puncture needle, restricting its movement direction during insertion, reducing wobbling, ensuring stability, alleviating patient pain, and preventing wound enlargement due to needle tip movement.
[0019] Furthermore, the second end of the trigger is provided with an end cap, and the end cap has a connecting hole that communicates with the hole of the fixing tube. The end cap ensures the cleanliness of the puncture needle inside the trigger, avoids infection, and further improves the safety of the blood collection needle.
[0020] Furthermore, one end of the fixing tube is connected to the end cap, and the other end extends toward the needle hub, with the extension length configured to allow at least a portion of the puncture needle to be inserted into the fixing tube. This structure, where at least a portion of the puncture needle is located within the fixing tube, allows the fixing tube to better guide the puncture needle, ensuring more stable and accurate insertion and retraction, further reducing wobbling of the puncture needle during insertion, and ensuring the stability of its operational mode.
[0021] Furthermore, it also includes a second elastic element, which is disposed between the trigger and the needle hub. The second elastic element can apply a biasing force to the needle hub in a third-direction movement. The second elastic element can better ensure that the puncture needle retracts into the trigger, thereby avoiding secondary needle tip injury to medical staff or patients and ensuring the safety of blood collection needle use.
[0022] Furthermore, the syringe and the trigger element, the needle hub and the trigger element, and the puncture needle and the fixing tube are all clearance fits. These clearance fits allow for relative movement between the syringe and the trigger element, and between the needle hub and the trigger element, ensuring proper insertion and retraction of the puncture needle. The clearance fit between the puncture needle and the fixing tube reduces shaking during insertion, ensuring stable and accurate insertion and retraction, and alleviating patient pain.
[0023] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0024] 1. The peripheral blood collection needle provided in this application, when in use, has a cutting part that can cut the stop plate in response to external pressure, so that the needle seat moves inside the channel under the biasing force of the first elastic element. Since a stop is set on the trigger element, the distance the needle seat moves can be limited when the puncture needle is inserted, thereby controlling the puncture depth of the puncture needle, which can reduce patient pain and prevent wound enlargement. It is suitable for different patients, and the structure is simple. Only a syringe and a trigger element are needed. After the puncture needle is placed inside the syringe and the trigger element, it can be ejected by the first elastic element. The manufacturing and assembly methods are more convenient and faster, which can reduce production and processing costs.
[0025] 2. This application provides a fixing tube within the trigger element to guide the puncture needle. When the puncture needle is inserted, its movement direction is restricted by the fixing tube, which reduces the shaking of the puncture needle during insertion and ensures the stability of the puncture needle during insertion, thereby alleviating patient pain.
[0026] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a cross-sectional view of a peripheral blood collection needle provided in an embodiment of this utility model;
[0029] Figure 2 This is a diagram showing the state of a stop piece being cut off according to an embodiment of the present invention;
[0030] Figure 3 This is a diagram showing a state where the needle holder is blocked, as provided in an embodiment of this utility model.
[0031] The reference numerals in the above figures are as follows: 1. Syringe; 2. Needle hub; 3. Puncture needle; 4. First elastic element; 5. Stop plate; 6. Trigger element; 7. Cutting part; 8. Stop block; 9. Step; 10. Connecting rod; 11. Fixing tube; 12. End cap; 13. Second elastic element; 14. First stop plate; 15. Second stop plate. Detailed Implementation
[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In addition, the accompanying drawings of the present invention are only simple schematic illustrations and are not depictions based on actual dimensions, as stated in advance.
[0033] In this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "forward," "backward," "between," "nearer," and "farthest" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to 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. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0034] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.
[0035] Reference Figures 1-3 This application provides a peripheral blood collection needle, including a syringe 1, a needle seat 2 disposed inside the syringe 1, a puncture needle 3 disposed on the needle seat 2, a first elastic member 4 disposed between the syringe 1 and the needle seat 2, the first elastic member 4 being in a compressed state, applying a biasing force to the needle seat 2 to move in a first direction, a stop plate 5 disposed inside the syringe 1 to fix the needle seat 2, the stop plate 5 being connected to the inner wall of the syringe 1 and the needle seat 2 respectively to prevent the needle seat 2 from moving in the initial state, a trigger member 6 inserted inside the syringe 1, the trigger member 6 having a through hole and a channel, the needle seat 2 being able to move within the channel of the trigger member 6, a cutting part 7 disposed at one end of the trigger member 6 facing the stop plate 5, the cutting part 7 being used to cut the stop plate 5, a stop block 8 passing through the through hole, the stop block 8 being able to move into the channel of the trigger member 6 to prevent the needle seat 2 from moving.
[0036] With the above structure, the peripheral blood collection needle in this embodiment can control the puncture depth of the puncture needle 3 according to actual needs, reduce patient pain, avoid wound enlargement, and is suitable for different patients.
[0037] Specifically, such as Figure 1 As shown, one end of the syringe 1 is open and the other end is closed. The shape and structure of the syringe 1 can be flexibly set, such as cylindrical, cylindrical, or other regular or irregular polygons.
[0038] In this embodiment, the syringe 1 has a step 9 inside, the step surface of the step 9 faces the trigger 6, one side of the stop plate 5 is connected to the step surface, and the other side is connected to the needle seat 2.
[0039] Optionally, the stop plate 5 may be made of materials such as cellulose fiber, polyethylene, polypropylene, polyvinyl chloride, or polyethylene terephthalate to facilitate cutting, and may be made of materials such as paper, breathable membrane, plastic film, or other easily cut materials.
[0040] Optionally, the stop plate 5 can be connected to the step surface by bonding or welding, or the stop plate 5 can be fixed to the step surface by screws.
[0041] In other possible embodiments, the inner wall of the syringe 1 is provided with a slot, and the stop plate 5 and the slot can be fixedly connected by snap-fit, or the connection method of the stepped surface and the slot can be combined to fix the stop plate 5 and improve the stability of the stop plate 5.
[0042] The trigger element 6 and the syringe 1 are in a clearance fit. In this embodiment, part of the trigger element 6 is located outside the syringe 1. The shape and structure of the trigger element 6 are set according to the shape and structure of the syringe 1, such as cylindrical, cylindrical, or other regular or irregular polygons. Clearance fit refers to a fit method in mechanical assembly where the size of the hole is always larger than the size of the shaft, ensuring a reserved gap between them to allow relative movement of parts or storage of lubricating medium.
[0043] A cutting section 7 extends from the first end of the trigger member 6 in a second direction. When the trigger member 6 moves relative to the syringe 1, the cutting section 7 disconnects the stop plate 5 from the syringe 1. Figure 1 As shown, in this embodiment, a slope is formed extending from the first end of the trigger member 6 in a second direction. The first end of the slope has a pointed tip, which is a cutting portion 7, and the cutting portion 7 contacts the stop plate 5. In this embodiment, the needle seat 2 is located inside the trigger member 6, and the needle seat 2 and the inner wall of the trigger member 6 are in a clearance fit. Figure 2 As shown, during use, the trigger 6 located outside the syringe 1 is pressed on the area where blood needs to be drawn. The syringe 1 and the trigger 6 move relative to each other under pressure, causing the cutting part 7 to abut against the stop plate 5 and cut the stop plate 5, dividing the stop plate 5 into a cut first stop plate 14 connected to the step 9 and a cut second stop plate 15 connected to the needle holder 2, thereby causing the needle holder 2 to be ejected.
[0044] The slope of the inclined plane can be flexibly set to ensure that the stop piece 5 can be cut off. Optionally, the angle between the first end of the inclined plane and the horizontal direction is 20° to 60°, so that the end of the first end of the inclined plane can more easily cut off the stop piece 5.
[0045] In this embodiment, the second end of the trigger 6 is provided with an end cap 12, and the end cap 12 is provided with a connecting hole so that the puncture needle 3 can be inserted.
[0046] In one possible embodiment, the trigger 6 has a first thread in its through hole, and the stop block 8 has a second thread corresponding to the first thread. The stop block 8 is connected to the trigger 6 through the first thread and the second thread.
[0047] In this embodiment, the syringe 1 has a through hole, and a connecting rod 10 is provided inside the through hole. One end of the connecting rod 10 passes through the syringe 1 and connects to the stop block 8, while the other end protrudes outside the syringe 1. The connecting rod 10 can respond to external pressure, causing the stop block 8 to move into the channel of the trigger member 6. When facing a patient with thicker skin, the stop block 8 is in its initial state, and the depth of insertion of the puncture needle 3 responds to the biasing force of the first elastic member 4. When facing a patient with thinner skin, the medical staff rotates the connecting rod 10, causing the stop block 8 to spirally move until it protrudes from the inner wall of the trigger member 6. When the needle seat 2 moves to the position of the stop block 8, it is blocked, thus limiting its further movement and causing the puncture needle 3 to penetrate to a shallower depth. Figure 3 As shown.
[0048] In this embodiment, the trigger 6 has a fixing tube 11 inside, and the fixing tube 11 has a tube hole communicating with the outside of the trigger 6. Figure 1 As shown, one end of the fixing tube 11 is connected to the end cap 12, and the tube hole inside the fixing tube 11 communicates with the connecting hole on the end cap 12. The other end extends toward the needle seat 2, and the extension length is set so that at least part of the puncture needle 3 is inserted into the fixing tube 11, and the puncture needle 3 and the fixing tube 11 are in clearance fit. In use, the puncture needle 3 pierces through the tube hole to the outside of the trigger 6.
[0049] To enable the puncture needle 3 to automatically retract into the trigger member 6, a second elastic member 13 is provided inside the trigger member 6. The first end of the second elastic member 13 is connected to the end cap 12, and the second end faces the needle seat 2. Optionally, the second end of the second elastic member 13 may or may not be in contact with the needle seat 2.
[0050] In this embodiment, the second end of the second elastic element 13 is connected to the needle seat 2. When the puncture needle 3 moves, the second elastic element 13 always applies a biasing force to the needle seat 2, causing the puncture speed of the puncture needle 3 to gradually decrease. When the puncture needle 3 moves to zero speed outside the syringe 1, the biasing force applied by the second elastic element 13 to the needle seat 2 causes the needle seat 2 to move in a third direction, thereby moving the puncture needle 3 along the tube hole of the fixing tube 11 into the trigger member 6. The third direction is opposite to the first direction of the puncture needle 3. Optionally, the second elastic element 13 is a spring or other elastic material.
[0051] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.
Claims
1. A lancet, comprising: include: A syringe having an opening; A needle hub is disposed inside the syringe barrel, and a puncture needle is provided on the needle hub; A first elastic element is disposed between the syringe and the needle seat, and the first elastic element applies a biasing force toward the needle seat to move in a first direction; A stop plate is provided, which is connected to the inner wall of the syringe and the needle seat respectively to fix the needle seat. A trigger element is movably inserted into the syringe. The trigger element has a through hole and a channel inside. The needle seat can move within the channel of the trigger element. The end of the trigger element facing the stop plate has a cutting part. A stop block is inserted into the through hole of the trigger element. The stop block can move into the channel of the trigger element to prevent the needle seat from moving.
2. The lancet of claim 1 wherein, The syringe has a step inside, with the step surface facing the trigger. One side of the stop plate is connected to the step surface, and the other side is connected to the needle seat.
3. The lancet of claim 1 wherein: The cutting portion extends from the first end of the trigger in a second direction to form the cutting portion. When the trigger moves relative to the syringe, the cutting portion disconnects the stop plate from the syringe.
4. The lancet of claim 1 wherein, The through hole is provided with a first thread, and the stop block is provided with a second thread corresponding to the first thread. The stop block and the trigger are connected through the first thread and the second thread.
5. The lancet of claim 1 wherein, It also includes a connecting rod that passes through the syringe and is connected to the stop block. The connecting rod is capable of moving the stop block into the channel of the trigger in response to external pressure.
6. The lancet of claim 1 wherein, It also includes a fixing tube, which is located inside the triggering element. The fixing tube has a hole inside it, which communicates with the outside of the triggering element, and the puncture needle can move within the hole.
7. The lancet of claim 1 wherein, The second end of the trigger is provided with an end cap, and the end cap is provided with a connecting hole, which is connected to the pipe hole of the fixed tube.
8. The lancet of claim 7 wherein, One end of the fixing tube is connected to the end cap, and the other end extends toward the needle hub, with the extension length set such that at least part of the puncture needle is inserted into the fixing tube.
9. The lancet of claim 1 wherein, It also includes a second elastic element disposed between the trigger and the needle seat, the second elastic element being capable of applying a biasing force toward the needle seat in a third direction.
10. The lancet of any one of claims 1 to 9, wherein, The syringe and the trigger element, the needle seat and the trigger element, and the puncture needle and the fixing tube are all clearance fits.