Infant indwelling needle capable of preventing mistaken pulling

Abstract

The utility model relates to a mistaken-pulling-preventing indwelling needle for infants, and belongs to the technical field of medical instruments. The base is used for being attached to the skin of a user; the fixing component is fixed on the base and is used for being jointed with a needle seat of the remaining needle to limit the displacement of the needle seat; the releasing assembly is connected to the base in a sliding mode and used for providing resistance for movement of the infusion tube; and the buffering assembly is fixed on the base and is arranged between the fixing assembly and the releasing assembly along a sliding path of the releasing assembly so as to be used for accommodating a preset buffering section of the infusion tube. Due to the fact that the fixing assembly is firmly fixed to the base all the time and is structurally decoupled from the releasing assembly bearing the pulling force, the remaining needle base keeps absolutely static all the time, and the purpose of reliably preventing mistaken pulling is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to an indwelling needle for children that can be prevented from being mistakenly removed. Background Art

[0002] In modern medical practice, intravenous catheters, as a key medical device, are widely used in clinical infusion therapy. They consist primarily of a metal core needle that punctures the blood vessel and a flexible cannula. After successful puncture, the core needle is removed, leaving only the flexible cannula in the patient's vein. The needle hub remains outside the body, connecting to the infusion line.

[0003] However, for infants and young children, a unique patient population, the accidental removal of intravenous catheters (commonly known as "accidental removal") is a very common and difficult clinical problem. There are many reasons for accidental removal in young children. Infants and young children lack the cognitive ability and willingness to cooperate, and are unable to understand the importance of intravenous catheter treatment. They often unconsciously scratch and pull at the catheter and its tubing due to irritability, pain, or curiosity. Turning over or kicking during sleep, or while playing, can easily cause the IV line to become caught on bedding, clothing, or toys, leading to accidental removal.

[0004] Currently, the most commonly used fixation method in clinical practice is to cover the indwelling needle puncture site with a sterile transparent dressing and then use a large area of ​​medical tape in a cross- or wrap-around manner to fix it, sometimes supplemented with a splint to restrict joint movement. However, young children have a high metabolism and sweat easily, and the oil and sweat secreted by the skin surface will continuously weaken the adhesiveness of the tape. After long-term application and physical activity, the edges of large areas of tape can easily loosen, creating new and more vulnerable points for snagging and pulling. Utility Model Content

[0005] In order to solve the above-mentioned problems in the prior art, the utility model provides an indwelling needle for children that can be prevented from being accidentally removed.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] Provided is a child-proof indwelling needle, comprising the indwelling needle and:

[0008] a base for attaching to the user's skin;

[0009] a fixing assembly fixed to the base and configured to engage with the needle seat of the indwelling needle to limit its displacement;

[0010] a release assembly slidably connected to the base for providing resistance to movement of the infusion tube;

[0011] And a buffer component is fixed on the base and is arranged between the fixing component and the releasing component along the sliding path of the releasing component to accommodate a preset buffer section of the infusion tube.

[0012] Preferably, the release assembly is provided with a wave-shaped or S-shaped friction channel, and the infusion tube is embedded in the friction channel to provide resistance to the movement of the infusion tube.

[0013] Preferably, the buffer assembly includes an Ω-shaped or U-shaped accommodating cavity for accommodating the preset buffer section.

[0014] Preferably, both the inlet and the outlet of the accommodating cavity are provided with smooth guide angles for preventing the infusion tube from bending or getting stuck.

[0015] Preferably, the Ω-shaped or U-shaped accommodating cavity has an upward open notch, and the accommodating cavity extends inward along the edge of the notch to form an inverted structure, so that the infusion tube can be pressed and received in the accommodating cavity in a snap-fit ​​manner.

[0016] Preferably, the fixing assembly is provided with a card slot that matches the outer contour of the needle seat of the indwelling needle, and the fixing assembly is engaged with the needle seat in a card-engaging manner through the card slot.

[0017] Preferably, a slide rail is provided on the base, and the release assembly is slidably connected by cooperating with the slide rail.

[0018] Preferably, the slide rail is provided with an initial positioning structure for defining a sliding starting point of the release assembly, and a limit block for defining an end point of the sliding thereof.

[0019] Preferably, the base is made of flexible medical material;

[0020] The fixing component, releasing component and buffer component are all made of hard medical materials.

[0021] Preferably, at least one of the fixing assembly, the releasing assembly and the buffer assembly is made of a transparent or translucent material so as to be used for observing the state of the needle seat or the infusion tube accommodated therein.

[0022] The utility model provides a child-proof indwelling needle that can prevent accidental removal. The beneficial effects of the utility model are as follows:

[0023] Since the fixing assembly is always firmly fixed to the base and is structurally decoupled from the release assembly that bears the tension, the indwelling needle seat remains absolutely stationary from beginning to end, thereby achieving the purpose of reliably preventing accidental removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of the indwelling needle for preventing accidental removal for children proposed by the utility model;

[0025] Figure 2 This is a cross-sectional view of the indwelling needle for preventing accidental removal for children proposed by the utility model;

[0026] Figure 3 for Figure 2 A local enlarged schematic diagram at point A;

[0027] Figure 4 This is a schematic structural diagram of the fixing assembly of the indwelling needle for preventing accidental removal for children proposed by the present invention;

[0028] Figure 5 This is a schematic structural diagram of the release assembly of the indwelling needle for preventing accidental removal for children proposed by the present invention;

[0029] Figure 6 This is a schematic structural diagram of the buffer assembly in the indwelling needle for preventing accidental removal for children proposed by the utility model.

[0030] Description of reference numerals:

[0031] 1. Indwelling needle; 2. Base; 201. Slide rail; 3. Fixing assembly; 301. Slot; 4. Release assembly; 401. Friction channel; 5. Buffer assembly; 501. Accommodating chamber. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figures 1-6 As shown, the specific embodiments provided by the present invention are as follows:

[0034] like Figures 1 to 3 As shown, an embodiment of the present invention provides an anti-accidental-removal indwelling needle 1 for infants, which includes the indwelling needle 1 itself, and further includes a base 2, a fixing component 3, a releasing component 4 and a buffer component 5.

[0035] Base 2 is the foundational support platform for the entire fixture. In this embodiment, base 2 is preferably a thin sheet-like structure with a medical-grade, hypoallergenic adhesive layer on its lower surface. This adhesive layer allows the entire device to be conveniently and securely attached to the skin near the puncture site, such as the arm or ankle, of a user (e.g., an infant). The material of base 2 is flexible enough to conform to the contours of the user's body, enhancing wearing comfort.

[0036] It should be noted that in order to ensure stability in the puncture area, it is still possible to cover it with a sterile transparent dressing and then use a large area of ​​medical tape to cross or wrap around it for fixing.

[0037] The fixing assembly 3 is fixedly mounted on the base 2, for example, by integral injection molding or high-strength bonding, ensuring that there is no relative movement between it and the base 2. The fixing assembly 3 is provided with an engagement structure (e.g., a retaining groove 301) for engaging with the needle hub of the indwelling needle 1 to restrict its movement. When the needle hub of the indwelling needle 1 engages with this engagement structure, the needle hub is securely locked to the base 2, preventing translation, rotation, or shaking, thereby ensuring the absolute immobility of the intravascular cannula.

[0038] In actual usage scenarios, medical staff will deliberately bend the infusion tube near the needle seat to form a buffer section, and use tape to fix this buffer section and the needle seat to the skin.

[0039] In principle, the idea of ​​setting a buffer section is similar to that of the present embodiment, and both aim to provide a buffer stroke before the pulling force directly acts on the needle seat. However, this implementation method, which relies entirely on the adhesive force of the tape, is not suitable for the special group of children. Because children have a high metabolism and are prone to sweating, the oil and sweat secreted from the skin surface will continuously weaken the adhesiveness of the tape. After long-term adhesion and physical activity, the edges of large-area tapes are prone to loosening and curling, which not only significantly reduces the fixing force, but the rolled-up tape edges themselves form new dangerous points that are more likely to be caught by clothing and bedding.

[0040] like Figure 5 As shown, the release assembly 4 absorbs and dissipates unexpected tension from the infusion tube. It is slidably connected to the base 2. This means that the release assembly 4 can move within a limited, controlled range along a predetermined path on the base 2, in the direction in which the infusion tube is subjected to force. A restraining portion is provided on the release assembly 4 to provide resistance to the movement of the infusion tube. When the infusion tube passes through this restraining portion, it will experience a certain amount of friction or other forms of resistance.

[0041] like Figure 6As shown, the buffer assembly 5 is also fixedly mounted on the base 2. Spatially, it is positioned between the fixing assembly 3 and the release assembly 4 and along the sliding path of the release assembly 4. The buffer assembly 5 is provided with a receiving portion for accommodating a pre-set buffer section of the infusion tube.

[0042] During actual use, medical personnel first adhere the base 2 to the skin and engage the needle hub of the indwelling needle 1 with the fixing assembly 3. Then, the infusion tube connected to the needle hub is first placed in the receiving portion of the buffer assembly 5 to form a predetermined buffer section with a sufficient length, and then the infusion tube is inserted into the restraining portion of the release assembly 4.

[0043] When the infusion tube is subjected to an unexpected pulling force, the pulling force first acts on the release component 4. Since it is slidable, it will immediately start to move along the sliding path on the base 2. This movement process absorbs the first peak of the impact force and plays a role of dynamic buffering. While the release component 4 slides, it will pull the infusion tube between it and the buffer component 5. Because the buffer component 5 is fixed, this traction force will smoothly and controllably straighten and release the preset buffer section pre-accommodated in the buffer component 5. This process consumes the stroke of the pulling force and ensures that the force will not be transmitted to the needle seat connection point at the fixed component 3. Throughout the process, the constraint part of the release component 4 also continues to provide frictional resistance to the withdrawal of the infusion tube, further consuming the energy of the pulling force.

[0044] Since the fixing assembly 3 is always firmly fixed on the base 2 and is structurally decoupled from the release assembly 4 that bears the tension, the needle seat of the indwelling needle 1 remains absolutely stationary from beginning to end, thereby achieving the purpose of reliably preventing accidental removal.

[0045] It should be pointed out that although the base 2 of the present invention is also attached to the skin by adhesive, its protection mechanism when the adhesive force is in a critical failure state is different from the prior art method of fixing with tape.

[0046] For example, when the adhesion of both to the skin drops to a critical value where they are about to fall off due to the child's prolonged sweating and oil secretion of the skin:

[0047] In the prior art, due to the lack of an effective mechanical buffer structure, any unexpected pulling force on the infusion tube will directly apply to the adhesive tape interface, which is already at the critical point of peeling. This additional force, even if small, increases the risk of the tape instantly peeling from the skin, and subsequently completely pulling out the indwelling needle 1, resulting in accidental removal.

[0048] In the embodiment of the present invention, however, when the infusion tube is subjected to the same pulling force, the force does not directly act on the adhesive layer of base 2, which is also at the critical value of separation. Instead, the initial impact energy of the pulling force and the vast majority of the subsequent force are first absorbed, buffered, and dissipated by the release component 4 and buffer component 5 on base 2. Both the sliding energy absorption of the release component 4 and the travel release of the buffer component 5 serve to protect the final adhesive interface.

[0049] As a result, after the pulling force is reduced, the residual stress ultimately transmitted to the adhesive layer of the base 2 is reduced. This provides significantly higher safety margins under the same critical bonding conditions, effectively preventing ultimate failure due to decreased bonding strength. Compared to existing technologies, its ability to prevent accidental removal is improved.

[0050] In a preferred embodiment, the release component 4 is provided with a wave-shaped or S-shaped friction channel 401 .

[0051] The friction channel 401 is a semi-open groove structure integrally formed on the release assembly 4. Its path is not a straight line, but rather a continuous, smooth, periodic curve, similar to a sine wave. When the infusion tube is pressed downward and inserted into the friction channel 401, the infusion tube itself will also form a corresponding wave or S-shaped bend due to the guidance of the channel.

[0052] When the infusion tube is subjected to tension and attempts to move axially, the outer wall of the tube comes into contact with the multiple curved inner walls of friction channel 401 over a large area and at multiple points, generating significant and uniform sliding friction. Compared to a single compression point or a straight channel, this multi-point, large-area friction more effectively dissipates and absorbs the kinetic energy of the pull. Furthermore, because friction channel 401 is a smooth curve, it avoids damage or stress concentration on the infusion tube wall that could be caused by sharp angles or bends.

[0053] In a preferred embodiment, the buffer assembly 5 includes an Ω-shaped or U-shaped receiving cavity 501 for accommodating the preset buffer section.

[0054] In clinical applications, the arbitrary and manual preparation of buffer lines creates uncertainties and safety risks. If only an open area is provided for the operator to reserve, the length, shape, and position of the reserved tubing will be random, resulting in extremely unstable buffering performance and even the possibility of the resulting coils becoming excessively cluttered and becoming new hooking points.

[0055] The Ω-shaped or U-shaped receiving chamber 501 proposed in this embodiment provides a standard template for pre-setting the buffer section. This receiving chamber 501 is a semi-open structure with a fixed internal path length. When medical personnel insert the infusion tube along this specific path, the infusion tube is forcibly shaped to form a regular loop of constant length.

[0056] The inlet and outlet of the accommodating cavity 501 are both provided with smooth guide angles for preventing the infusion tube from bending or getting stuck.

[0057] When the release component 4 slides and pulls the infusion tube from the accommodating cavity 501 of the buffer component 5 at high speed or high tension, if the edge of the accommodating cavity 501 is a traditional sharp right angle, the edge will become a stress concentration point. At the moment the infusion tube is pulled out and changes direction, it is very easy to get stuck at this sharp angle, causing the pipeline to be over-squeezed and blocked, or to be stuck due to a sudden increase in friction. Both situations will seriously undermine the smooth release of the buffer mechanism and may even damage the infusion tube itself. Therefore, the smooth chamfered or rounded corners of the inlet and outlet edges of the accommodating cavity 501 are formed into a guiding surface. The guiding surface replaces the sharp right-angled edge with a smooth arc surface, so that when the infusion tube is pulled out of the cavity, the pressure it receives is evenly distributed on a section of the arc surface instead of being concentrated on one point, eliminating the physical conditions that cause the pipeline to bend or be damaged, and effectively protecting the structural integrity of the infusion tube.

[0058] In a preferred embodiment, the Ω-shaped or U-shaped accommodating cavity 501 has an upwardly open notch, and the accommodating cavity 501 extends inwardly along the edge of the notch to form an undercut structure.

[0059] The upward-facing, open notch provides a convenient entry point for medical personnel, allowing them to insert the infusion tube into the accommodating cavity 501 (for example, using a cotton swab). The undercut structure refers to a pair of or a single edge of the notch in the accommodating cavity 501, each with a slight, downward-sloping lip extending inward. This makes the width of the notch slightly smaller than the width of the cavity interior. Once the infusion tube is fully inserted into the cavity, the tube wall and lip return to their original shape, creating a physical barrier that prevents the tube from accidentally dislodging.

[0060] In a preferred embodiment, a slide rail 201 is provided on the base 2 , and the release assembly 4 is slidably connected to the slide rail 201 by cooperating with the release assembly 4 .

[0061] For example, the slide rail 201 can be a raised track with a T-shaped or dovetail-shaped cross-section, arranged along the sliding path of the release assembly 4. Accordingly, the bottom surface of the release assembly 4 is provided with a groove that matches the shape of the track. When the release assembly 4 is mounted on the base 2, the groove engages with the track of the base 2, forming a guide for linear motion.

[0062] In a preferred embodiment, the slide rail 201 is provided with an initial positioning structure for defining the sliding starting point of the release assembly 4 and a limit block for defining the sliding end point thereof.

[0063] The initial positioning structure is a mechanical structure for providing a preset static friction force or positioning force at the starting point of sliding. For example, it can set a tiny pit at the starting position of the slide rail 201, and set a protrusion that cooperates with it on the slider of the release component 4. In the initial state, the protrusion will be stuck in the pit, forming a slight lock. Sliding will only start when the pulling force acting on the release component 4 reaches a threshold value sufficient to cause the protrusion to break away from the pit. The limit stop is a physical obstacle set at the end of the path of the slide rail 201. When the release component 4 slides to its maximum stroke, it will come into contact with the stop and be reliably blocked.

[0064] In a preferred embodiment, the base 2 is made of a flexible medical material; and the fixing component 3, the releasing component 4 and the buffer component 5 are all made of a hard medical material.

[0065] The flexible medical material may be, for example, medical-grade silicone, thermoplastic elastomer, etc. The hard medical material may be, for example, medical-grade polycarbonate, etc.

[0066] In a preferred embodiment, at least one of the fixing component 3, the releasing component 4 and the buffer component 5 is made of a transparent or translucent material so as to be used for observing the status of the needle seat or the infusion tube accommodated therein.

[0067] In the traditional nursing process, in order to check the status of the covered area, medical staff often need to remove or partially uncover the fixture, which not only increases the workload, but may also inadvertently cause the indwelling needle 1 to shift during the operation.

[0068] Made of medical-grade transparent or highly translucent polymers, it provides medical staff with a non-invasive visualization window.

[0069] Medical personnel can directly observe through the transparent fixing assembly 3 whether the needle hub is completely and correctly engaged in its locking groove 301, eliminating the safety risks caused by improper installation. In addition, through the transparent buffer assembly 5 and release assembly 4, they can check whether the infusion tube is kinked, compressed, or bent, which may affect the smoothness of the infusion.

[0070] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A child-proof indwelling needle, comprising an indwelling needle, characterized in that: Also includes: a base for attaching to the user's skin; a fixing assembly fixed to the base and configured to engage with the needle seat of the indwelling needle to limit its displacement; a release assembly slidably connected to the base for providing resistance to movement of the infusion tube; And a buffer component is fixed on the base and is arranged between the fixing component and the releasing component along the sliding path of the releasing component to accommodate a preset buffer section of the infusion tube.

2. The indwelling needle for preventing accidental removal for children according to claim 1, characterized in that: The release component is provided with a wave-shaped or S-shaped friction channel, and the infusion tube is embedded in the friction channel to provide resistance to the movement of the infusion tube.

3. The indwelling needle for preventing accidental removal for children according to claim 1, characterized in that: The buffer assembly includes an Ω-shaped or U-shaped accommodating cavity for accommodating the preset buffer section.

4. The indwelling needle for preventing accidental removal for children according to claim 3, characterized in that: The inlet and outlet of the accommodating cavity are both provided with smooth guide angles for preventing the infusion tube from bending or getting stuck.

5. The indwelling needle for preventing accidental removal for children according to claim 4, characterized in that: The Ω-shaped or U-shaped accommodating cavity has an upward open notch, and the accommodating cavity extends inward along the edge of the notch to form an inverted structure, so that the infusion tube can be pressed and received in the accommodating cavity in a snap-fit ​​manner.

6. The indwelling needle for preventing accidental removal for children according to claim 1, characterized in that: The fixing assembly is provided with a card slot that matches the outer contour of the needle seat of the indwelling needle, and the fixing assembly is engaged with the needle seat in a card-engaging manner through the card slot.

7. The indwelling needle for preventing accidental removal for children according to claim 1, characterized in that: The base is provided with a slide rail, and the release assembly is slidably connected by cooperating with the slide rail.

8. The indwelling needle for preventing accidental removal for children according to claim 7, characterized in that: The slide rail is provided with an initial positioning structure for defining a sliding starting point of the release assembly, and a limit block for limiting a sliding end point thereof.

9. The indwelling needle for preventing accidental removal for children according to claim 1, characterized in that: The base is made of flexible medical material; The fixing component, releasing component and buffer component are all made of hard medical materials.

10. The indwelling needle for preventing accidental removal for children according to claim 1, characterized in that: At least one of the fixing assembly, the releasing assembly and the buffer assembly is made of a transparent or translucent material so as to be used for observing the state of the needle seat or the infusion tube accommodated therein.

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