Control structure for implantation length of peripheral venous indwelling needle
By designing a control structure for the venous indwelling needle including an inner sleeve, a cylinder, a casing sleeve and a scalable outer cannula, the problem of the indwelling length of the venous indwelling needle cannot be adjusted in the prior art, flexible adjustment of the outer cannula is achieved, and the safety and convenience of venous indwelling are improved.
Patent Information
- Application Number
- CN202421724939.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The length of existing venous indwelling needles cannot be flexibly adjusted, resulting in too long or too short catheters, prone to bending and blocking the tube or exposing the skin, increasing the risk of venous damage and infection.
A control structure for the length of the peripheral vein indwelling needle is designed, including an inner sleeve, a cylinder, an outer sleeve sleeve and a scaled outer sleeve cannula. Through the coordination of the block and the groove, the vertical position of the outer sleeve can be adjusted, so that the needle core and the outer sleeve cannula are maintained in the same position, ensuring the stable insertion of the catheter in the vein.
It realizes the flexibility to adjust the extension length of the outer sleeve without changing the structural size of the needle body, adapt to the requirements of different insertion lengths, reduces the risk of venous damage and infection, and improves the convenience and safety of the venous indwelling needle.
Smart Images
Figure CN223026469U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical injection devices, in particular to a control structure for the insertion length of a peripheral intravenous indwelling needle. Background Technique
[0002] An intravenous indwelling needle is a medical device used to leave a catheter under the skin of a patient for infusing fluids, drugs, or providing other treatments. The intravenous indwelling needle can be left in the patient's vein for a long time, avoiding the inconvenience and pain caused by multiple punctures, making infusion more convenient and comfortable. Compared with repeated intubation, the intravenous indwelling needle can reduce skin and vein damage and lower the risk of infection and complications. The depth of insertion of the intravenous indwelling needle usually needs to be judged according to specific circumstances. The depth of insertion of the intravenous indwelling needle depends on factors such as the patient's physical characteristics (such as subcutaneous fat thickness, blood vessel depth, etc.), the insertion site (arm, back of the hand, palm, etc.), and the nature and use of the fluid or drug to be infused. Generally speaking, the insertion length of the intravenous indwelling needle seriously affects complications such as phlebitis and the indwelling time. It should be ensured that a sufficient length of the catheter is located within the vein cavity to maintain stability and not easily fall off. At the same time, it is necessary to avoid inserting too deep to increase the venous friction area and cause damage to deep tissues or venous perforation. However, the specifications of the indwelling needle are configured before leaving the factory, and there is always a problem of not being suitable for the patient. If the catheter is too long, the part left outside the skin will be too long, and it is easy to bend and block the tube. If the catheter is too short, the part exposed outside the skin will be too short, and the bottom end of the catheter will be too close to the blood vessel wound. After fixing the indwelling needle, due to the relatively thick outer leaking syringe, it is easy to lift the skin and blood vessels at the puncture point and cause damage. Therefore, it is necessary to design an intravenous indwelling needle that can adjust the extension length of the outer catheter. Therefore, we propose a control structure for the insertion length of a peripheral intravenous indwelling needle. Content of the Utility Model
[0003] The purpose of the utility model is to provide a control structure for the insertion length of a peripheral intravenous indwelling needle, which solves the problems raised in the background technique.
[0004] To achieve the above object, the present utility model provides the following technical solutions: A control structure for the insertion length of a peripheral intravenous indwelling needle, comprising an inner sleeve, a cylinder, an outer sleeve tube, and an outer sleeve tube with scales on its surface. On both sides of the inner wall at the top of the outer sleeve tube, there are integrally formed clamping blocks. The inner sleeve includes an inner needle core. On the outer wall surface of the inner needle core, a number of ring bodies of the same size are vertically and equidistantly arranged. On both the left and right sides of the ring body, there are vertical grooves 1, and on both the front and back sides of the ring body, there are vertical grooves 2. On both the front and back sides of the ring body, there are transverse grooves, and the transverse grooves are connected to the vertical grooves 2. The top end of the outer sleeve tube is sleeved on the outside of the bottom end of the inner sleeve. The outer sleeve tube is sleeved inside the outer sleeve tube. At the bottom of the inner wall of the outer sleeve tube, there is a fixed rubber ring. At the top of the outer sleeve tube, there is a fixed nesting, and the nesting is in interference fit and inlaid connection with the bottom of the cylinder. At the top of the inner sleeve, there is a tube joint. The top end of the inner needle core is communicated with the output end at the bottom of the tube joint. At the top of the tube joint, there is a three-way connector communicated. At the top of the three-way connector, there is a needle core, and the needle core is inlaid in the outer sleeve tube. The three-way connector is connected to the three-way joint through an extension tube. The tube joint is sleeved on the top of the cylinder.
[0005] As a preferred implementation manner of the technical solution of the present application, the size of the clamping block is consistent with that of the vertical groove 1, and the size of the vertical groove 1 is consistent with that of the vertical groove 2.
[0006] As a preferred implementation manner of the technical solution of the present application, the vertical dimension of the transverse groove is the same as that of the clamping block, and the horizontal dimension of the transverse groove is five times that of the horizontal dimension of the clamping block.
[0007] As a preferred implementation manner of the technical solution of the present application, a sealing ring for fitting and contacting with the outer sleeve tube is inlaid at the bottom end of the inner needle core.
[0008] As a preferred implementation manner of the technical solution of the present application, a needle wing is fixedly arranged on the outside of the cylinder, and convex points are integrally formed on the surface of the needle wing.
[0009] As a preferred implementation manner of the technical solution of the present application, the cylinder is made of PC material, which is a transparent medical plastic material.
[0010] As a preferred implementation manner of the technical solution of the present application, there is a thread at the connection between the three-way connector and the needle core. On the outer wall surface of the needle core, there is an outer thread integrally formed for adjusting the vertical position. The three-way connector and the needle core are connected by thread fit.
[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0012] The technical solution of the present application can adjust the extension length when the clamping block of the outer sleeve is located on the first vertical groove. By rotating the outer sleeve, the clamping block passes through the second vertical groove and enters the inside of the horizontal groove, and the clamping block is staggered from the second vertical groove, so that the vertical position of the outer sleeve is limited. The vertical position of the needle core can also be adjusted so that the needle core and the outer sleeve are kept in the same position, ensuring that the outer sleeve can cooperate with the needle core to penetrate into the blood vessel together. Without changing the structural dimensions of the needle body, the adjustment of the extension length of the outer sleeve is realized, so as to flexibly adapt to the requirements of different insertion lengths of the outer sleeve. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] By reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings, other features, objects and advantages of the present invention will become more apparent:
[0014] Figure 1 is a schematic structural diagram of the outer sleeve of the present invention;
[0015] Figure 2 is a schematic structural diagram of the inner sleeve of the present invention;
[0016] Figure 3 is a partial cross-sectional view of a control structure for the insertion length of a peripheral intravenous indwelling needle of the present invention;
[0017] Figure 4 is an attachment Figure 2 is a cross-sectional view taken along line A-A in the figure.
[0018] In the figure: 1. Outer sleeve; 101. Clamping block; 2. Inner sleeve; 201. Inner needle core; 202. Ring body; 203. First vertical groove; 204. Second vertical groove; 205. Horizontal groove; 206. Sealing ring; 3. Outer sleeve cover; 301. Rubber ring; 4. Nesting; 5. Cylinder; 6. Needle wing; 7. Extension tube; 8. Three-way joint; 9. Needle core; 10. Three-way connector. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0020] Embodiment 1, as Figures 1-4As shown in the figure, the utility model provides a technical solution: a control structure for the insertion length of a peripheral intravenous indwelling needle, including an inner sleeve 2, a cylinder body 5, an outer sleeve tube 3 and an outer sleeve 1 with a scale on its surface. On both sides of the inner wall at the top of the outer sleeve 1, clamping blocks 101 are integrally formed. The inner sleeve 2 includes an inner needle core 201. On the outer wall surface of the inner needle core 201, a number of ring bodies 202 of the same size are vertically arranged at equal intervals. On both the left and right sides of the ring body 202, vertical grooves 203 are opened. On both the front and back sides of the ring body 202, vertical grooves 204 are opened. On both the front and back sides of the ring body 202, transverse grooves 205 are opened. The transverse grooves 205 are communicated with the vertical grooves 204. The top end of the outer sleeve 1 is sleeved outside the bottom end of the inner sleeve 2. The outer sleeve 1 is sleeved inside the outer sleeve tube 3. At the bottom of the inner wall of the outer sleeve tube 3, a rubber ring 301 is fixedly arranged, which can improve the sealing performance at the connection between the outer sleeve tube 3 and the outer sleeve 1. At the top of the outer sleeve tube 3, a nesting 4 is fixedly arranged. The nesting 4 is in interference fit and inlaid connection with the bottom of the cylinder body 5. At the top of the inner sleeve 2, a tube joint is arranged. The top end of the inner needle core 201 is communicated with the output end at the bottom of the tube joint. At the top of the tube joint, a three-way connector 10 is communicated. At the top of the three-way connector 10, a needle core 9 is communicated. The needle core 9 is inlaid inside the outer sleeve 1. The three-way connector 10 is connected with a three-way joint 8 through an extension tube 7. The tube joint is sleeved on the top of the cylinder body 5;
[0021] A thread is provided at the connection between the three-way connector 10 and the needle core 9. On the outer wall surface of the needle core 9, an external thread for adjusting the vertical position is integrally formed. The three-way connector 10 and the needle core 9 are connected by thread fit. Near the tip of the needle core 9, a side hole is provided. When the needle core 9 and the outer sleeve 1 are accurately inserted into the blood vessel, the blood return through the side hole is used to judge whether the insertion into the blood vessel is in place.
[0022] In a specific embodiment of the present utility model, the inner sleeve 2 is sleeved inside the outer sleeve 1. A ring body 202 is arranged outside the inner needle core 201. The distance between two adjacent ring bodies 202 is consistent with the vertical dimension of the clamping block 101, so that the clamping block 101 can enter the inside of the vertical groove two 204 along the gap between two adjacent clamping blocks 101, and finally the clamping block 101 is clamped into the inside of the horizontal groove 205. The cylinder body 5 is made of a transparent material, which is convenient for the operation of aligning the clamping block 101 with the vertical groove two 204 and clamping it into the inside of the horizontal groove 205. The nesting 4 and the lower end of the cylinder body 5 are clamped by an interference fit method. Similarly, the pipe joint is also clamped with the cylinder body 5 by an interference fit method. The outer sleeve 1 is made of a medical soft tube material, which is used for being indwelled inside the blood vessel and protecting the blood vessel of the patient. The area where the clamping block 101 is arranged at the top of the outer sleeve 1 needs to be made of a rigid medical plastic material, so as to facilitate improving the fixing performance of the outer sleeve 1. The needle core 9 passes through the three-way connector 10, the inner needle core 201 and the outer sleeve 1. The tip of the needle core 9 at the bottom end protrudes 0.5 mm from the bottom end of the outer sleeve 1 (that is, the distance between the lower cut surface of the tip inclined plane of the needle core 9 at the bottom end and the bottom end of the outer sleeve 1 is 0.5 mm). The tip of the needle core 9 at the bottom end is closely attached to the bottom end of the outer sleeve 1, so that the inner needle core 201 and the outer sleeve 1 can be inserted into the blood vessel together (the principle of how to insert the outer sleeve and the needle core into the blood vessel together can refer to the traditional indwelling needle). Subsequently, the needle core 9 is withdrawn. A self-closing rubber plug can be arranged above the connection point of the extension tube 7 and below the threaded port at the top end of the three-way connector 10. The needle core 9 punctures the rubber plug and enters the inside of the inner needle core 201 and the outer sleeve 1. When the needle core 9 is withdrawn, the rubber plug adaptively elastically closes, which can prevent the backflow and ejection of blood. Subsequently, a suitable threaded cap can also be used to block the threaded port at the top end of the three-way connector 10, and the three-way joint 8 is used for liquid medicine delivery.
[0023] In the preferred technical solution, the size of the clamping block 101 is consistent with that of the vertical groove one 203, the size of the vertical groove one 203 is consistent with that of the vertical groove two 204, the vertical dimension of the horizontal groove 205 is consistent with the vertical dimension of the clamping block 101, and the horizontal dimension of the horizontal groove 205 is five times the horizontal dimension of the clamping block 101, which is beneficial to improving the stability when the clamping block 101 is clamped into the horizontal groove 205 and making it not easy for the clamping block 101 to accidentally slide out of the horizontal groove 205 from the vertical groove two 204.
[0024] In the preferred technical solution, a sealing ring 206 for fitting and contacting with the outer sleeve 1 is inlaid at the bottom end of the inner needle core 201, which can improve the sealing performance when the outer sleeve 1 and the inner needle core 201 are communicated.
[0025] In the preferred technical solution, a needle wing 6 is fixedly arranged outside the cylinder body 5, and convex points are integrally formed on the surface of the needle wing 6 to improve the friction force when holding the needle wing 6.
[0026] In the preferred technical solution, the barrel 5 is made of PC material, which is a transparent medical plastic material. PC material has high transparency, corrosion resistance, high temperature resistance and good mechanical properties, making it easy to adjust the position of the outer sleeve 1 through the barrel 5.
[0027] Working principle: There are two input ends and one output end through the three-way connector 8. The output end of the three-way connector 8 is connected to an input end of the three-way connector 10 through the extension tube 7. The three-way connector 8 is used to input two or only one kind of liquid medicine at the same time. The liquid medicine is transported to the inner needle core 201 through the three-way connector 10 and the tube body connector, and finally reaches the outer sleeve 1. If it is necessary to adjust the extended length of the outer sleeve 1 before acupuncture, you can refer to the scale of the outer sleeve 1, and align the block 101 of the outer sleeve 1 with the vertical groove 1 203, adjust the vertical position of the outer sleeve 1, and then align the block 101 of the outer sleeve 1 with the gap area of the two adjacent ring bodies 202 through the cylinder 5, and then rotate the outer sleeve 1 clockwise or counterclockwise to align the block 101 of the outer sleeve 1 with the vertical groove 204, and then move the outer sleeve 1 downward to make the block 101 of the outer sleeve 1 fall into the inside of the horizontal groove 205, and finally rotate clockwise. The needle or counterclockwise rotation of the outer sleeve 1 makes the block 101 of the outer sleeve 1 staggered with the vertical groove 204. At this time, the vertical movement of the outer sleeve 1 is restricted, and the outer sleeve will not stretch during the acupuncture. Then the needle core 9 is rotated to change the vertical position of the needle core 9 and the three-way connector 10, so that the inclined lower cut surface at the bottom of the needle core 9 is 0.5mm longer than the bottom end of the outer sleeve 1, that is, the Lai distance is kept at 0.5mm, and the needle tip at the bottom of the needle core 9 is closely fitted with the bottom end of the outer sleeve 1. Then the indwelling needle puncture operation can be performed. After the indwelling needle pierces the blood vessel, the needle is inserted a little more when blood returns. Then the needle core 9 is rotated to draw the needle core back into the outer sleeve, and the outer sleeve is continued to be pushed forward. The insertion length is determined according to the blood vessel situation, and 3-5mm of the outer sleeve 1 is reserved outside the skin. The needle core is completely evacuated, and the rubber plug at the top of the cylinder is automatically closed to prevent blood from flowing back out. Then the three-way connector 8 is used in conjunction with the extension tube to transport the liquid medicine.
Claims
1. A control structure for the insertion length of a peripheral venous indwelling needle, characterized in that: The invention comprises an inner sleeve (2), a cylinder (5), an outer sleeve sleeve (3) and an outer sleeve (1) with scales on its surface, wherein both sides of the inner wall of the top of the outer sleeve (1) are integrally formed with blocks (101), the inner sleeve (2) comprises an inner needle core (201), and a plurality of ring bodies (202) of the same size are vertically equidistantly arranged on the outer wall surface of the inner needle core (201), the left and right sides of the ring body (202) are each provided with a vertical groove 1 (203), the front and rear sides of the ring body (202) are each provided with a vertical groove 2 (204), the front and rear sides of the ring body (202) are each provided with a horizontal groove (205), and the horizontal groove (205) is connected to the vertical groove 2 (204), the top end of the outer sleeve (1) is sleeved on the outside of the bottom end of the inner sleeve (2), and the outer sleeve (1) is provided with a plurality of ring bodies (202) of the same size at a vertical distance from each other. ) is sleeved inside the outer sleeve (3), a rubber ring (301) is fixedly provided at the bottom of the inner wall of the outer sleeve (3), a nesting (4) is fixedly provided at the top of the outer sleeve (3), the nesting (4) is interference fitly connected with the bottom of the barrel (5), a tube body joint is provided at the top of the inner sleeve (2), the top of the inner needle core (201) is connected to the output end at the bottom of the tube body joint, a three-way connector (10) is provided at the top of the tube body joint, a needle core (9) is provided at the top of the three-way connector (10), the needle core (9) is embedded in the inner sleeve (1), the three-way connector (10) is connected to the three-way connector (8) through an extension tube (7), and the tube body joint is sleeved on the top of the barrel (5).
2. A control structure for the insertion length of a peripheral venous indwelling needle according to claim 1, characterized in that: The size of the block (101) is consistent with that of the first vertical slot (203), and the size of the first vertical slot (203) is consistent with that of the second vertical slot (204).
3. A control structure for the insertion length of a peripheral venous indwelling needle according to claim 2, characterized in that: The vertical dimension of the transverse groove (205) is consistent with the vertical dimension of the card block (101), and the transverse dimension of the transverse groove (205) is five times the transverse dimension of the card block (101).
4. The control structure for the insertion length of a peripheral venous indwelling needle according to claim 1, characterized in that: A sealing ring (206) is embedded at the bottom end of the inner needle core (201) and is used for fitting in contact with the outer sleeve (1).
5. The control structure for the insertion length of a peripheral venous indwelling needle according to claim 1, characterized in that: A needle wing (6) is fixedly provided on the outside of the cylinder (5), and a convex point is integrally formed on the surface of the needle wing (6).
6. A control structure for the insertion length of a peripheral venous indwelling needle according to claim 5, characterized in that: The cylinder (5) is made of any one of transparent medical plastic materials, PC and PP.
7. A control structure for the insertion length of a peripheral venous indwelling needle according to claim 1, characterized in that: The connection between the three-way connector (10) and the needle core (9) is provided with a thread, and the outer wall surface of the needle core (9) is integrally formed with an external thread for adjusting the vertical position, and the three-way connector (10) and the needle core (9) are connected by threaded matching.