Pediatric scalp puncture indwelling needle assembly

Abstract

The pediatric scalp puncture remaining needle assembly comprises a circular sleeve, an annular sliding groove is formed in the side face of the circular sleeve, the surface of the circular sleeve is rotationally sleeved with a fixing sleeve plate, and a plurality of extrusion blocks are evenly arranged on the inner wall face of the fixing sleeve plate in the circumferential direction at equal intervals; and elastic arc-shaped plates are uniformly mounted on the inner wall surface of the circular sleeve in a polar axis equidistant manner. By arranging the elastic assembly and the locking structure, when the whole remaining needle punctures, after the steel needle makes contact with the surface of the skull, under the resistance of the skull, resistance is transmitted to the contact face of the three-way pipe and the arc-shaped plate and transmitted into the whole of the arc-shaped plate and the elastic arc-shaped plate, and the resistance is far larger than the acting force of the arc-shaped plate on the three-way pipe; therefore, when the needle head of the steel needle is in contact with the surface of the skull of an infant, the circular sleeve and the three-way pipe can timely slip off, so that the steel needle is prevented from further pricking into the skull, and the safety degree of the remaining needle in use is improved.

Description

Technical Field

[0001] This invention relates to the field of indwelling needle technology, and more specifically, to a pediatric scalp puncture indwelling needle assembly. Background Technology

[0002] Indwelling intravenous catheters, also known as intravenous cannulas, consist of a flexible catheter / cannulas that can be left in a blood vessel and a stainless steel puncture guide needle. When in use, the catheter and needle are inserted into the blood vessel together. Once the catheter is fully in the blood vessel, the needle is withdrawn, leaving only the flexible catheter in the blood vessel for intravenous infusion therapy.

[0003] However, it still has some shortcomings in actual use. For example, the current indwelling needle assembly lacks elastic protection during puncture. When the steel needle is inserted into the blood vessel, if there is a slight angular deviation, the steel needle tip can easily pierce into the skull of a child. Since the skull of a child is not fully developed, if the steel needle tip is inserted too deeply, it can easily cause irreversible damage to the skull of the child. The safety of its operation needs to be improved. At the same time, when the current indwelling needle is used to puncture a child, extra attention needs to be paid to the direction of the steel needle. Therefore, its operation is difficult and the error tolerance rate is low.

[0004] We will study and improve upon the existing structure and its shortcomings to provide a pediatric scalp puncture indwelling needle assembly, aiming to achieve a more practical value. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a pediatric scalp puncture indwelling needle assembly. By incorporating an elastic component and a locking structure, when the entire indwelling needle is inserted, after the steel needle contacts the skull surface, the resistance from the skull is transmitted to the contact surface between the three-way tube and the arc-shaped plate, and further transmitted to the arc-shaped plate and the elastic arc-shaped plate as a whole. The resistance is much greater than the force exerted by the arc-shaped plate on the three-way tube. Therefore, when the needle tip contacts the surface of the child's skull, the circular sleeve and the three-way tube can slip off in time, thereby preventing the steel needle from further penetrating into the skull. This provides protection against deep puncture of the child's skull, improves the safety of indwelling needle use, and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pediatric scalp puncture indwelling needle assembly, comprising a drug delivery connector, an end cap, and a drug delivery valve, wherein one end of the drug delivery connector is connected to an extension tube, the other end of the extension tube is connected to a three-way tube, a hemostatic clip is snapped onto the surface of the three-way tube, an isolation plug is provided inside the three-way tube, a steel needle is provided inside the three-way tube, and an elastic component is fitted onto the surface of the three-way tube;

[0007] The elastic component includes a circular sleeve with an annular groove on its side. A fixed sleeve plate is rotatably fitted onto the surface of the circular sleeve. Both the upper and lower ends of the fixed sleeve plate are integrally formed with fitting side plates. The inner side of the fitting side plates is fitted with the surface of the circular sleeve. Several extrusion blocks are evenly distributed circumferentially on the inner wall of the fixed sleeve. Elastic arc plates are evenly distributed polarly on the inner wall of the circular sleeve. The elastic arc plates are arranged sequentially from bottom to top as a connecting seat, an arc plate, and a contact plate. The back of the connecting seat is embedded in the inner wall of the circular sleeve. A locking structure is fixed to one end of the fitting side plate.

[0008] The arc-shaped plate and the contact plate are located on opposite sides of the elastic arc-shaped plate, and the elastic arc-shaped plate is arc-shaped with the same curvature as the circular sleeve. The concave part of the elastic arc-shaped plate points towards the central axis of the circular sleeve, and the convex part of the arc-shaped plate is located on the side close to the central axis of the circular sleeve. The convex part of the contact plate is located in the opposite direction to the convex part of the arc-shaped plate. The contact plate has a semi-shuttle-shaped structure, which is thinner at both ends and thicker in the center. Several contact plates correspond one-to-one with several extrusion blocks, and their centers are located on the same horizontal plane. The thickness of the extrusion block near the contact plate increases in a triangular shape from one side to the other. The surface finish of the contacting surfaces of the extrusion block and the contact plate is between Ra0.3 and Ra0.6. The side of the arc-shaped plate is in close contact with the outer surface of the tee pipe, and the minimum value of the combined force of several arc-shaped plates on the outer periphery of the tee pipe is greater than 10N and the maximum value is less than 20N.

[0009] In a preferred embodiment, the locking structure includes a fixing cylinder, one end of which is embedded in one side of the fitting side plate, and an inner cavity is formed inside the fixing cylinder, with a bracket embedded inside the inner cavity.

[0010] In a preferred embodiment, connecting square plates are installed at both the upper and lower ends of the bracket, and threaded sleeves are embedded on the sides of both connecting square plates. A stud is installed in the internal thread of the threaded sleeve, and an elastic washer and a rotating handle are respectively installed at both ends of the stud.

[0011] In a preferred embodiment, the surface of the rotary handle is provided with an anti-slip texture, the inner wall of the threaded sleeve is uniformly coated with a layer of lubricating oil, and the elastic gasket is provided with an arc-shaped surface adapted to it on the side near the elastic component, the surface of the arc-shaped surface being provided with a rough surface.

[0012] In a preferred embodiment, the inner diameter of the circular sleeve is greater than the outer diameter of the tee pipe, and the overall length of the circular sleeve ranges from 3cm to 3.5cm. The connecting seat is distributed at the opening on the side of the circular sleeve.

[0013] The technical effects and advantages of this invention are as follows:

[0014] 1. This invention, by incorporating an elastic component and a locking structure, ensures that when the indwelling needle is inserted, the steel needle tip contacts the skull surface. The resistance from the skull is then transmitted to the contact surface between the three-way tube and the arc-shaped plate, and further to the arc-shaped plate and the elastic arc-shaped plate as a whole. This resistance is significantly greater than the force exerted by the arc-shaped plate on the three-way tube. Therefore, when the needle tip contacts the surface of the child's skull, the circular sleeve and the three-way tube can slip off in time, preventing the needle from further penetrating the skull. This provides protection against deep penetration of the child's skull, enhancing the safety of the indwelling needle. Furthermore, even if the angle deviates during needle insertion, the needle will not penetrate deeply into the child's skull. This invention offers a high margin of error, reduces the mental stress on the operator, and lowers the difficulty of operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the overall structure of the elastic component of the present invention;

[0017] Figure 3 This is a schematic diagram of a half-section of the elastic component of the present invention;

[0018] Figure 4 For the present invention Figure 3 A magnified structural diagram at point A;

[0019] Figure 5 This is a three-dimensional structural diagram of the elastic component of the present invention;

[0020] Figure 6 This is a schematic diagram of the fixed sleeve structure of the present invention;

[0021] Figure 7 This is a partial structural diagram of the fixing sleeve of the present invention;

[0022] Figure 8 For the present invention Figure 7 A magnified structural diagram at point A;

[0023] Figure 9 This is a schematic diagram of the side structure of the elastic arc-shaped plate of the present invention;

[0024] Figure 10 This is a schematic diagram of the side structure of the elastic arc-shaped plate of the present invention;

[0025] Figure 11 This is a top view of the circular sleeve structure of the present invention;

[0026] Figure 12 This is a schematic diagram of the contact state between the extrusion block and the contact plate of the present invention;

[0027] Figure 13 This is a top view of the extrusion block structure of the present invention;

[0028] Figure 14 This is a three-dimensional structural diagram of the locking structure of the present invention.

[0029] The attached figures are labeled as follows: 10, drug delivery connector; 20, end cap; 30, drug delivery valve; 40, extension tubing; 50, hemostatic clip; 60, tee tube; 70, isolation plug; 80, steel needle; 2, elastic component; 21, circular sleeve; 22, annular groove; 23, fixing sleeve; 24, fitting side plate; 25, compression block; 26, elastic arc plate; 27, connecting seat; 28, arc plate; 29, contact plate; 3, locking structure; 31, fixing cylinder; 32, inner cavity; 33, bracket; 34, connecting square plate; 35, threaded sleeve; 36, stud; 37, elastic washer; 38, rotating handle. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] As attached Figure 1 To be continued Figure 14 The pediatric scalp puncture indwelling needle assembly shown includes a drug delivery connector 10, an end cap 20, and a drug delivery valve 30. One end of the drug delivery connector 10 is connected to an extension tube 40, and the other end of the extension tube 40 is connected to a three-way tube 60. A hemostatic clip 50 is snapped onto the surface of the three-way tube 60. An isolation plug 70 is provided inside the three-way tube 60, and a steel needle 80 is provided inside the three-way tube 60. An elastic component 2 is fitted onto the surface of the three-way tube 60. The inlet end of the drug delivery connector 10 is closed by the drug delivery valve 30 and opened when drug delivery is performed. The side opening of the drug delivery connector 10 is closed by the end cap 20 and opened when drug delivery is assisted. The isolation plug 70 serves as an elastic seal after the steel needle 80 is removed. After the steel needle 80 is inserted, the hemostatic clip 50 serves as an anti-backflow component for blood.

[0032] The elastic component 2 includes a circular sleeve 21. An annular groove 22 is formed on the side of the circular sleeve 21. A fixed sleeve plate 23 is rotatably fitted onto the surface of the circular sleeve 21. Both the upper and lower ends of the fixed sleeve plate 23 are integrally formed with fitting side plates 24. The inner side of the fitting side plates 24 is fitted to the surface of the circular sleeve 21. A plurality of pressing blocks 25 are evenly distributed circumferentially on the inner wall of the fixed sleeve plate 23. Elastic arc-shaped plates 26 are evenly distributed along the polar axis on the inner wall of the circular sleeve 21. Connecting elements are sequentially arranged from bottom to top on the elastic arc-shaped plates 26. The connecting seat 27, the arc plate 28, and the contact plate 29 are installed with the back of the connecting seat 27 embedded in the inner wall of the circular sleeve 21. A locking structure 3 is fixed to one side of the fitting side plate 24. The pressing block 25 inside the fixed sleeve 23 can be rotated, so that it gradually contacts the side contact plate 29 of the elastic arc plate 26 from the thinnest end. By utilizing the characteristic of the pressing block 25 to become thicker from thin, the elastic arc plate 26 is gradually compressed and deformed as a whole, and bent towards the central axis of the circular sleeve 21, so as to facilitate the adjustment of the degree of compression of the elastic arc plate 26 on the three-way pipe 60.

[0033] The arc-shaped plate 28 and the contact plate 29 are located on opposite sides of the elastic arc-shaped plate 26, and the elastic arc-shaped plate 26 is arc-shaped, with its curvature consistent with that of the circular sleeve 21. The concave part of the elastic arc-shaped plate 26 points towards the central axis of the circular sleeve 21. The protrusion of the arc-shaped plate 28 is located on the side close to the central axis of the circular sleeve 21. The protrusion of the contact plate 29 is located in the opposite direction to the protrusion of the arc-shaped plate 28. The contact plate 29 has a semi-shuttle-shaped structure, with thinner ends and a thicker center. Several contact plates 29 and several... Each of the extrusion blocks 25 corresponds to one other, and the centers of both are located on the same horizontal plane. The thickness of the extrusion block 25 near the contact plate 29 increases in a triangular shape from one side to the other. The surface finish of the contacting extrusion block 25 and the contact plate 29 is between Ra0.3 and Ra0.6. The side of the arc plate 28 is in contact with the outer surface of the three-way pipe 60. By setting the surface finish between the extrusion block 25 and the contact plate 29 to Ra0.4, the flexibility of the two when in contact is high, the smoothness is improved, and the wear rate between the two structures is reduced.

[0034] Among them, the minimum value of the combined force exerted by the several arc-shaped plates 28 on the outer periphery of the three-way tube 60 is greater than 10N and the maximum value is less than 20N. According to existing medical experimental data, the pressure of the steel needle piercing the skin and blood vessels of an infant is 3.183 MPa, and the pressure that the infant's skull can withstand is between 30 MPa and 35 MPa. Therefore, the force range of the arc-shaped plates 28 is set between 10N and 20N. This ensures that the steel needle 80 can be smoothly inserted between the infant's skin and blood vessels, and also ensures that when the needle tip of the steel needle 80 contacts the surface of the infant's skull, the circular sleeve 21 can slip off from the three-way tube 60 in time, thereby ensuring its safety.

[0035] The bracket 33 has connecting square plates 34 installed at both its upper and lower ends. Threaded sleeves 35 are inlaid on the sides of both connecting square plates 34. A stud 36 is installed in the internal thread of the threaded sleeve 35. An elastic washer 37 and a rotating handle 38 are respectively installed at both ends of the stud 36. The surface of the rotating handle 38 is set with anti-slip texture. A layer of lubricating oil is evenly coated on the inner wall of the threaded sleeve 35. The elastic washer 37 has an arc-shaped surface that matches it on the side close to the elastic component 2. The surface of the arc-shaped surface is set with a rough surface.

[0036] Please refer to the attached instruction manual for details. Figure 7-8 The locking structure 3 includes a fixing cylinder 31, one end of which is embedded in one side of the fitting side plate 24. The fixing cylinder 31 has an inner cavity 32, and a bracket 33 is embedded in the inner cavity 32.

[0037] The specific implementation method is as follows: the elastic pads 37 at both ends are rotated and fixed to the surface of the circular sleeve 21 by the studs 26 using the bracket 33, thereby fixing the fixed sleeve 23 on one side and ensuring that it remains highly stable in the annular groove 22.

[0038] Please refer to the attached instruction manual for details. Figure 2-6 The inner diameter of the circular sleeve 21 is greater than the outer diameter of the tee pipe 60, and the overall length of the circular sleeve 21 ranges from 3cm to 3.5cm. The connecting seat 27 is distributed at the opening on the side close to the circular sleeve 21.

[0039] The specific implementation method is as follows: the inner diameter of the circular sleeve 21 is greater than the outer diameter of the tee pipe 60, so that the two structures can be easily slidably connected, while increasing the convenience of operation for the operator.

[0040] Working principle of the invention:

[0041] Step 1: First, the operator assembles the various components of the device normally, then holds the surface of the circular sleeve 21 and stabilizes the child's head to facilitate the next step of inserting the indwelling needle.

[0042] Step 2: After disinfecting the puncture site, the needle is inserted smoothly into the child's skin and vein. If an error occurs during needle insertion (e.g., the angle deviates and the needle is inserted towards the skull), the needle tip will first contact the skull surface. Then, under the resistance of the skull, the resistance is transmitted to the entire three-way tube 60, subsequently to the contact surface between the three-way tube 60 and the arc-shaped plate 28, and finally to the entire arc-shaped plate 28 and the elastic arc-shaped plate 26. Since the pressure that a child's skull can withstand is 30... The pressure ranges from 10 MPa to 35 MPa, while the initial force range of the arc plate 28 is around 10 N. Therefore, when the steel needle encounters resistance, the instantaneous value of the resistance is greater than 10 N. As a result, when the tip of the steel needle 80 contacts the surface of the child's skull, the circular sleeve 21 and the three-way tube 60 can slip off in time, thereby preventing the steel needle 80 from further penetrating into the skull and providing buffer protection for the child's skull. Subsequently, the steel needle can be removed and replaced with another set of indwelling needles for puncture and infusion at other locations.

[0043] Step 3: When adjusting the pressure of the arc plate 28 on the tee pipe 60, pinch the surface of the fixed sleeve 23 and rotate the fixed sleeve 23 so that the inner pressing block 25 and the contact plate 29 slide towards the pressing block 25 from thin to thick. At this time, the fixed sleeve 23 and the pressing block 25 slide at a uniform speed in the annular groove 22. By increasing the thickness of the pressing block 25, the contact plate 29 drives the elastic arc plate 26 to twist and deform towards the central axis of the circular sleeve 21, thereby increasing the contact pressure between the arc plate 28 below the elastic arc plate 26 and the tee pipe 60. The rotation angle can be controlled at will in real time. After the adjustment is completed, rotate the handle 38 to drive the stud 36 and the elastic washer 37 at one end to move towards the surface of the circular sleeve 21 until the elastic washer 37 contacts and presses against the surface of the circular sleeve 21. This uses the friction of the structure to fix the fixed sleeve 23 and prevent it from rotating incorrectly in subsequent use.

[0044] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0045] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0046] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pediatric scalp puncture indwelling needle assembly, comprising a drug delivery connector, an end cap, and a drug delivery valve, characterized in that: One end of the drug delivery connector is connected to an extension tube, and the other end of the extension tube is connected to a three-way tube. A hemostatic clip is snapped onto the surface of the three-way tube, an isolation plug is installed inside the three-way tube, a steel needle is installed inside the three-way tube, and an elastic component is fitted onto the surface of the three-way tube. The elastic component includes a circular sleeve with an annular groove on its side. A fixed sleeve plate is rotatably fitted onto the surface of the circular sleeve. Both the upper and lower ends of the fixed sleeve plate are integrally formed with fitting side plates. The inner side of the fitting side plates is fitted with the surface of the circular sleeve. Several extrusion blocks are evenly distributed circumferentially on the inner wall of the fixed sleeve. Elastic arc plates are evenly distributed polarly on the inner wall of the circular sleeve. The elastic arc plates are arranged sequentially from bottom to top as a connecting seat, an arc plate, and a contact plate. The back of the connecting seat is embedded in the inner wall of the circular sleeve. A locking structure is fixed to one end of the fitting side plate. The arc-shaped plate and the contact plate are located on opposite sides of the elastic arc-shaped plate, and the elastic arc-shaped plate is arc-shaped with the same curvature as the circular sleeve. The concave part of the elastic arc-shaped plate points towards the central axis of the circular sleeve, and the convex part of the arc-shaped plate is located on the side close to the central axis of the circular sleeve. The convex part of the contact plate is located in the opposite direction to the convex part of the arc-shaped plate. The contact plate has a semi-shuttle-shaped structure with both ends being thinner than the center. Several contact plates correspond one-to-one with several extrusion blocks, and the centers of both are located on the same horizontal plane. The thickness of the extrusion block near the contact plate increases in a triangular shape from one side to the other. The side of the arc-shaped plate is in contact with the outer surface of the tee pipe.

2. The pediatric scalp puncture indwelling needle assembly according to claim 1, characterized in that: The locking structure includes a fixing cylinder, one end of which is embedded in one side of the fitting side plate. The fixing cylinder has an inner cavity, and a bracket is embedded in the inner cavity. The surface finish of the contacting extrusion block and the contact plate is between Ra0.3 and Ra0.

6. The minimum value of the combined force exerted by the arc-shaped plates on the outer periphery of the tee pipe is greater than 10N and the maximum value is less than 20N.

3. The pediatric scalp puncture indwelling needle assembly according to claim 3, characterized in that: The bracket is equipped with connecting square plates at both the top and bottom. Threaded sleeves are embedded in the sides of both connecting square plates. Studs are installed in the internal threads of the threaded sleeves. Elastic washers and rotating handles are respectively installed at both ends of the studs.

4. The pediatric scalp puncture indwelling needle assembly according to claim 1, characterized in that: The surface of the rotary handle is provided with anti-slip texture, the inner wall of the threaded sleeve is uniformly coated with a layer of lubricating oil, and the elastic gasket is provided with an arc-shaped surface that matches the elastic component on the side thereon, and the surface of the arc-shaped surface is provided with a rough surface.

5. A pediatric scalp puncture indwelling needle assembly according to claim 5, characterized in that: The inner diameter of the circular sleeve is greater than the outer diameter of the tee pipe, and the overall length of the circular sleeve ranges from 3cm to 3.5cm. The connecting seat is distributed at the opening on the side near the circular sleeve.

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