A snap-on integrated pre-filled catheter flusher

Abstract

The application relates to the technical field of medical catheter flushers, in particular to a buckle integrated pre-filled catheter flusher which comprises a needle cylinder, a disinfection cap shell, a push rod and protective chains arranged on the two sides of the push rod. One end of the push rod is connected with a piston column head which is slidably sleeved on the inner side of the needle cylinder. A plurality of position display grooves are formed in the two sides of the push rod. The surface of the protective chain is provided with engaging pieces which are correspondingly connected with the position display grooves. Protective ear structures are respectively connected to the two ends of the protective chain and located on the outer periphery of the needle cylinder and the push rod. The surface of the protective chain is provided with lock grooves which are matched with the push wings. The disinfection cap and the pre-filled catheter flusher are integrated into a structure, so that the joint continuously maintains a sterile state during storage and transportation, and the risk of cross infection during clinical use is reduced. Meanwhile, the protective chain forms a one-time locking structure, so that the push rod is prevented from being misoperated to cause leakage of the flushing liquid or air to enter the inside of the needle cylinder.

Description

Technical Field

[0001] This invention relates to the field of medical catheter flushing technology, specifically a snap-fit ​​integrated pre-filled catheter flushing device. Background Technology

[0002] With the widespread application of intravenous infusion therapy, central venous catheter maintenance, PICC catheter care, and implantable infusion port maintenance technologies, pre-filled catheter flushing devices, as disposable medical devices pre-filled with catheter flushing solution, are widely used in hospital clinical nursing processes for catheter flushing, catheter sealing maintenance, and tubing patency management.

[0003] Currently, when using pre-filled catheter flushing devices in clinical practice, healthcare workers typically need to use alcohol swabs, iodine swabs, or individual sterilization caps to disinfect the needleless infusion connector before removing the pre-filled catheter flushing device to complete the connection and flushing operation. Because the disinfection supplies and the catheter flushing device are separate, multiple contacts and operations are required during handling, unpacking, and connection, increasing the complexity of the nursing process and prolonging the operation time. Furthermore, the disinfected connector may still be exposed to the external environment while waiting to be connected, posing a possibility of recontamination and increasing the risk of cross-infection. In addition, most existing pre-filled catheter flushing devices lack a transport locking mechanism for the plunger. During product storage, transportation, or retrieval, the plunger is easily subjected to external impacts, causing axial movement and premature discharge of the flushing fluid from the syringe, leading to leakage. In some cases, changes in the piston position may even allow external air to enter the syringe, affecting the sterility of the flushing fluid and its safety.

[0004] In view of this, we have studied and improved upon the existing problems to provide a snap-fit ​​integrated pre-filled catheter flushing device to solve the current issues. Summary of the Invention

[0005] The present invention aims to solve the problems of existing pre-filled catheter flushing devices, such as the need for additional disinfection supplies to disinfect the needleless infusion connector, cumbersome operation steps, risk of cross-infection, and lack of effective locking structure for the push rod, which can easily lead to malfunction, liquid leakage or air entering the syringe during transportation and storage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A snap-fit ​​integrated pre-filled catheter flushing device includes a syringe, a sterile cap shell, a push rod, and protective chains arranged on both sides of the push rod. One end of the push rod is connected to a piston head that slides onto the inside of the syringe. Several axially equidistant positioning grooves are formed on both sides of the push rod. Several engaging pieces are provided on the surface of the protective chain, and each engaging piece is fitted into the inside of each positioning groove. The two ends of the protective chain are respectively connected to a first protective lug and a second protective lug located on the outer periphery of the syringe and the push rod. The two ends of the syringe are respectively provided with a connector and a push wing. The surface of the protective chain is provided with a locking groove located on the outer periphery of the push wing. The positioning and locking of the push rod and the syringe are achieved by the locking groove engaging and fitting with the surface of the push wing. The sterile cap shell is detachably fitted onto the surface of the connector. One end of the sterile cap shell is provided with a protective membrane for forming a sealed environment. A protective cap located on the inner side of the sterile cap shell is connected to the surface of the connector. A sterile cap core is provided on the inner side of the protective cap.

[0007] The above structure integrates the disinfection structure with the pre-filled catheter flushing device, ensuring that the connector remains continuously disinfected and sterile during product storage and transportation. This eliminates the need for healthcare personnel to use separate disinfection supplies to complete the disinfection preparation work before catheter connection, thereby reducing the risk of cross-infection and improving clinical nursing efficiency.

[0008] In a preferred embodiment, the push rod and its protective chains on both sides are integrally injection molded, with each connecting piece sleeved inside each indicator groove, and micro-connection points located inside the indicator grooves on the outer periphery of the connecting pieces. By adopting an integral molding structure, the transport locking assembly can be directly formed during the production stage, reducing assembly steps; at the same time, the micro-connection points can ensure that the protective chains have sufficient connection strength during transportation and storage, and can be easily disassembled during use, improving the product's ease of use.

[0009] In a preferred embodiment, the position indicator slots are further configured such that they are linearly distributed along the axial direction of the push rod surface, and the distance between adjacent position indicator slots is equal. The push rod surface is provided with scale markings located on one side of the position indicator slots. By setting the position indicator slots and scale markings, the push rod advancement position can be displayed in segments, allowing medical staff to intuitively grasp the output volume of the catheter irrigation fluid and improve the accuracy of irrigation fluid quantitative control.

[0010] In a preferred embodiment, the syringe surface is further configured such that a lens window is provided, the lens window and the syringe are integrally formed, the surface of the lens window is a transparent convex spherical surface, and the position of the lens window corresponds to the surface of the scale markings. The lens window creates a magnified observation effect, improving the visibility of the scale markings and making it easier for medical personnel to observe the pusher's advancement status and the fluid delivery volume during use, thereby improving operational accuracy.

[0011] In a preferred embodiment, the protective chain is further configured as follows: the connecting plates are flexible strip structures, and the connecting plates are connected to the surface of the protective chain using micropillars. Each connecting plate surface is provided with digital scale markings, and these digital scale markings correspond to the syringe volume. By establishing a correspondence between the digital scale markings and the syringe volume, the intuitiveness of liquid volume identification can be further improved, providing a reference for precise clinical irrigation.

[0012] In a preferred embodiment, the first and second protective ears are both semi-circular arc-shaped structures, with diameters adapted to the diameters of the syringe and the push rod, respectively. By using the protective ear structure to position and support both ends of the protective chain, the structural stability in the locked state can be improved, preventing loosening during transportation.

[0013] In a preferred embodiment, the disinfection cap is further configured as follows: the disinfection cap core is a medical rubber plug structure used for sealing the connector port; the inner side of the protective cap is provided with a medical cotton core filled with disinfectant. The disinfection cap core and disinfectant work together to form a continuous disinfection structure, ensuring a sealed connector while maintaining the sterility of the connector surface, thus reducing the risk of infection during catheter connection.

[0014] In a preferred embodiment, one end of the sterilization cap shell is sealed with a protective film, forming a sealed sterile environment inside the sterilization cap shell. The protective film and the sterilization cap shell together constitute a closed protective space, reducing the entry of external air, dust, and microorganisms into the internal space, thereby further improving the sterility reliability of the product during storage.

[0015] The beneficial effects achieved by this invention are as follows: 1. In this invention, a multi-layered sealed protective structure is formed by the outer shell of the disinfection cap, the protective cap, and the disinfection cap core. The connector is always in a closed sterile environment during storage and transportation. The disinfection medium inside the disinfection cap core can continuously disinfect the surface of the connector, effectively reducing the risk of external microbial and dust contamination, reducing the risk of cross-infection during catheter connection, and improving the safety and clinical reliability of the catheter flushing device.

[0016] 2. In this invention, the push rod and the protective chain adopt an integrated injection molding structure. Each connecting piece is connected to the corresponding position groove through a micro-connection point. At the same time, the locking groove and the push wing are used to lock and restrict the push rod, so that the pre-filled catheter flushing device can maintain a stable initial state before storage, transportation and use, and avoid the flushing fluid being discharged prematurely due to accidental push rod advancement. When in use, the unlocking operation can be completed by simply tearing off the protective chain. The structure is simple and intuitive, easy to use, and has a one-time anti-disassembly function, which makes it easy for medical staff to quickly confirm whether the product has been opened and used.

[0017] 3. In this invention, after the protective chain is peeled off, the indicator grooves on both sides of the push rod are exposed, and together with the scale markings, they form a push position display structure. The scale markings can be magnified and observed through the lens window on the surface of the syringe, so that medical staff can more intuitively grasp the push rod's push stroke and the amount of liquid squeezed out during the flushing process, thereby achieving precise control of the catheter flushing fluid delivery volume and improving the standardization of flushing operations and the accuracy of quantitative drug administration. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the syringe and sterilization cap shell according to an embodiment of the present invention; Figure 3 This is an exploded structural diagram of a syringe, plunger, and protective chain according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the push rod in the advancing state according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the push rod surface structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the surface structure of the protective chain according to an embodiment of the present invention.

[0019] Figure label: 1. Syringe; 11. Connector; 12. Pusher; 13. Lens window; 2. Sterilization cap outer shell; 21. Protective film; 22. Protective cap; 23. Sterilization cap core; 3. Push rod; 31. Indicator slot; 32. Piston head; 33. Scale markings; 4. Protective chain; 41. First protective lug; 42. Second protective lug; 43. Locking groove; 44. Connecting piece. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0022] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a snap-fit ​​integrated pre-filled catheter flushing device.

[0023] Combination Figures 1 to 6As shown, the present invention provides a snap-fit ​​integrated pre-filled catheter flushing device, including a syringe 1, a sterilization cap shell 2, a push rod 3, and protective chains 4 arranged on both sides of the push rod 3. One end of the push rod 3 is connected to a piston head 32 that is slidably sleeved inside the syringe 1. Several axially equidistant positioning grooves 31 are provided on both sides of the push rod 3. Several connecting pieces 44 are provided on the surface of the protective chain 4, and each connecting piece 44 is sleeved on the inner side of each positioning groove 31. The two ends of the protective chain 4 are respectively connected to a first protective ear 41 and a second protective ear 42 located on the outer periphery of the syringe 1 and the push rod 3. The two ends of the syringe 1 are respectively provided with a connector 11 and a push wing 12. The surface of the protective chain 4 is provided with a locking groove 43 located on the outer periphery of the push wing 12. The positioning and locking of the push rod 3 and the syringe 1 are achieved by the locking groove 43 snapping and fitting with the surface of the push wing 12.

[0024] In this embodiment, the push rod 3 and the protective chains 4 on both sides are manufactured by a one-time injection molding process. The connecting piece 44 and the indicator groove 31 are connected by several micro-connection points. Each micro-connection point preferably adopts a columnar connection structure with a diameter of 0.3-0.8mm. This ensures sufficient connection strength during transportation and storage, while also allowing for easy breakage by manual pulling during use.

[0025] Specifically, each indicator groove 31 is evenly arranged along the axial direction of the push rod 3 surface, and the distance between adjacent indicator grooves 31 is the same. The push rod 3 surface is provided with a scale mark 33 located on one side of the indicator groove 31. The scale mark 33 can be set in the form of a digital scale, a capacity scale line, or a combination of the two, to indicate the amount of flushing fluid squeezed out of the catheter inside the syringe 1.

[0026] A lens window 13 is provided on the surface of the syringe 1 near the pusher 12. The lens window 13 and the syringe 1 are integrally injection molded. The lens window 13 is preferably made of transparent medical plastic material and has an outwardly convex spherical structure, which gives it a magnifying effect. The lens window 13 is set corresponding to the scale mark 33. During the advancement of the pusher 3, the scale mark 33 can be magnified and displayed, which is convenient for medical staff to observe the amount of irrigation fluid delivered.

[0027] In this embodiment, the protective chain 4 is made of flexible medical plastic material, with a first protective lug 41 and a second protective lug 42 at both ends. The first protective lug 41 is a semi-circular arc structure adapted to the outer diameter of the syringe 1, and the second protective lug 42 is a semi-circular arc structure adapted to the outer diameter of the push rod 3. After the protective chain 4 is installed, the first protective lug 41 and the second protective lug 42 respectively encircle the outer periphery of the syringe 1 and the push rod 3, so that the protective chain 4 is stably fixed to the surface of the product.

[0028] Furthermore, the locking groove 43 on the surface of the protective chain 4 engages with the outer edge of the pusher wing 12. When the protective chain 4 is not removed, the locking groove 43 restricts the axial displacement of the pusher wing 12, thus preventing the pusher rod 3 from being pushed into the syringe 1. This structure effectively prevents the pusher rod 3 from moving due to accidental contact during transportation, handling, and storage, prevents premature leakage of the flushing fluid inside the syringe 1, and prevents external air from entering the syringe 1 and affecting the sterility.

[0029] In this embodiment, a sterilization cap shell 2 is fitted onto the outside of the connector 11. The sterilization cap shell 2 is made of transparent or semi-transparent medical plastic material, and one end of it is sealed by a protective film 21 to form a closed cavity. A protective cap 22 is threaded onto the surface of the connector 11, and a sterilization cap core 23 is installed inside the protective cap 22.

[0030] The disinfection cap core 23 is made of medical rubber plug structure and is used to seal the port of connector 11. The protective cap 22 has a medical cotton core inside, which is impregnated with alcohol, iodine, chlorhexidine gluconate or a combination of disinfectants, so that the disinfection cap core 23 can continuously release disinfection medium and perform long-term disinfection treatment on the surface of connector 11, thereby keeping connector 11 in a sterile state during storage.

[0031] In another embodiment, the protective chain 4 is a flexible strip, and the connecting piece 44 is connected to the surface of the protective chain 4 by micropillars with a diameter of 1-3mm. Each connecting piece 44 has a digital scale marking on its surface, and the digital scale marking corresponds to the volume of the syringe 1. When the protective chain 4 is torn off and detached from the push rod 3, the connecting piece 44 can be retained, and the digital scale marking on the surface of the connecting piece 44 is clearer.

[0032] Working principle and usage process of this invention: In this invention, the syringe 1 is pre-filled with flushing fluid before leaving the factory, and the piston head 32 is sealed against the inner wall of the syringe 1 to form a sealed fluid storage space. At this time, the push rod 3 is in the initial locked state. The protective chains 4 on both sides of the push rod 3 are connected to the indicator groove 31 through the connecting piece 44 to form an integral structure. The first protective lug 41 and the second protective lug 42 at both ends of the protective chain 4 are respectively sleeved on the outer periphery of the syringe 1 and the push rod 3. At the same time, the locking groove 43 is engaged with the push wing 12, thereby restricting the axial movement of the push rod 3 relative to the syringe 1 and preventing the push rod 3 from being pushed forward prematurely due to accidental contact during transportation, storage and handling, which would cause flushing fluid leakage or outside air to enter the syringe 1.

[0033] Meanwhile, a sterilization cap shell 2 is sleeved on the outside of the connector 11, a protective cap 22 is threaded onto the surface of the connector 11, and a sterilization cap core 23 is located inside the protective cap 22 and contacts the end of the connector 11. The sterilization cap core 23 contains sterilization solution, which can continuously sterilize the connector 11. The end of the sterilization cap shell 2 is sealed by a protective film 21, so that a relatively closed sterile environment is formed inside the sterilization cap shell 2, thereby maintaining the cleanliness of the connector 11 during product storage.

[0034] In actual use, medical staff first remove the protective film 21, and then unscrew the outer shell 2 and the inner protective cap 22 of the disinfection cap. Since the connector 11 is always in the disinfection environment formed by the core of the disinfection cap 23 before use, there is no need to use alcohol swabs, iodine swabs or separate disinfection caps for pretreatment. The connector 11 can be directly connected to the needleless infusion connector or catheter interface, thereby reducing nursing steps, improving clinical operation efficiency, and reducing the risk of cross-infection caused by multiple contacts.

[0035] After the connection is completed, medical staff hold the protective chain 4 and apply a tearing force. The micro-connection points between each connecting piece 44 and the position indicator groove 31 break, causing the entire protective chain 4 to detach from both sides of the push rod 3. At the same time, the locking groove 43 disengages from the surface of the push wing 12, releasing the locking restriction on the push rod 3. After the protective chain 4 is removed, the push rod 3 returns to its advancing state, and each position indicator groove 31 and scale mark 33 are exposed to the outside.

[0036] Subsequently, the push rod 3 is pushed into the syringe 1, and the push rod 3 drives the piston head 32 forward synchronously, so that the catheter flushing fluid inside the syringe 1 is output through the connector 11 and enters the catheter system to realize catheter flushing or sealing operations. During the advancement, the scale mark 33 moves synchronously with the push rod 3. Medical staff can observe the scale mark 33 and the position indicator groove 31 at the corresponding positions through the lens window 13 on the surface of the syringe 1. The lens window 13 provides a magnified observation effect, making the advancement distance and the amount of fluid squeezed out more clearly visible, thereby accurately grasping the delivery volume of catheter flushing fluid and realizing quantitative flushing and precise control.

[0037] Once the plunger 3 is advanced to the end position, all the pre-filled catheter flushing fluid inside the syringe 1 is discharged, completing the catheter flushing operation. Since the protective chain 4 has been removed during use and permanently separated from the plunger 3, it creates a one-time opening mark, facilitating medical personnel to identify whether the product has been used. This helps prevent reuse and improves clinical safety.

[0038] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A snap-fit ​​integrated pre-filled catheter flushing device, characterized in that, include: The syringe (1) has a connector (11) and a pusher (12) at both ends; The outer shell (2) of the disinfection cap is detachably fitted onto the surface of the connector (11); The push rod (3) has a piston head (32) that is slidably sleeved inside the syringe (1) at one end. Several position grooves (31) are provided on both sides of the push rod (3) and are distributed equidistantly along the axial direction. The protective chain (4) is arranged on both sides of the push rod (3). The surface of the protective chain (4) is provided with a locking groove (43) located on the outer periphery of the push wing (12). The push rod (3) and the syringe (1) are positioned and locked by the locking groove (43) and the push wing (12) surface engaging and fitting together.

2. The snap-fit ​​integrated pre-filled catheter flushing device according to claim 1, characterized in that, The push rod (3) and the protective chains (4) on both sides are integrally injection molded. Each connecting piece (44) is sleeved on the inner side of each indicator groove (31), and the outer periphery of the connecting piece (44) is provided with a micro connection point located inside the indicator groove (31). The micro connection point is a columnar connector with a diameter of 0.3-0.8mm.

3. The snap-fit ​​integrated pre-filled catheter flushing device according to claim 1, characterized in that, Each of the indicated slots (31) is distributed in a straight line along the axial direction of the push rod (3), and the distance between adjacent indicated slots (31) is equal. The push rod (3) has a scale mark (33) on one side of the indicated slot (31).

4. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 1, characterized in that, The syringe (1) has a lens window (13) located at one end of the pusher (12) on its surface. The syringe (1) and the lens window (13) are integrally formed. The surface of the lens window (13) is a transparent convex spherical surface, which is used to form a convex lens structure. The position of the lens window (13) corresponds to the surface position of the scale mark (33).

5. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 1, characterized in that, The protective chain (4) is connected to a first protective ear (41) and a second protective ear (42) located on the outer periphery of the syringe (1) and the push rod (3), respectively. The protective chain (4) is provided with a number of connecting pieces (44), and each connecting piece (44) is fitted into the inner side of each indicator groove (31) in a corresponding manner.

6. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 5, characterized in that, The protective chain (4) is a flexible strip. The connecting piece (44) is connected to the surface of the protective chain (4) by micropillars. The diameter of the micropillars is 1-3mm. Each connecting piece (44) has a digital scale mark on its surface, and the digital scale mark corresponds to the volume of the syringe (1).

7. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 5, characterized in that, The first lug (41) and the second lug (42) are both semi-circular arcs, and their diameters are adapted to the diameters of the syringe (1) and the push rod (3), respectively.

8. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 1, characterized in that, A protective film (21) is pasted on one end of the outer shell (2) of the disinfection cap to seal the outer shell (2). The surface of the connector (11) is threaded with a protective cap (22) located inside the outer shell (2). The inner side of the protective cap (22) is provided with a disinfection cap core (23).

9. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 8, characterized in that, The disinfection cap core (23) is a medical rubber plug structure used to seal the port of the connector (11). One end of the protective cap (22) is provided with a medical cotton core, which is filled with disinfectant to maintain a sterile environment inside the outer shell (2) of the disinfection cap.

10. A snap-fit ​​integrated pre-filled catheter flushing device according to claim 1, characterized in that, One end of the outer shell (2) of the disinfection cap is sealed by a protective film (21), and a sealed sterile environment is formed inside the outer shell (2).

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