Duplex mixed long pipe structure capable of repeatedly shaping guide pipe

Abstract

The invention discloses a duplex mixed long pipe structure capable of repeatedly shaping a guide pipe. The injection molding head is used for connecting the catheter and the liquid medicine channel of the medicine mixer, and two liquid inlets are formed in the upper end face and used for transferring liquid of the injector to the catheter in a butt joint mode; the injection molding head is a duplex connector, the duplex connector is composed of two parts, one part is a plastic head connected with the guide pipe, the other part is a two-way head, the two-way head is fixed to the upper portion of the plastic head, and the two-way head is provided with two internal liquid channels used for conveying liquid; the guide pipe is provided with at least two liquid holes, the two liquid holes are through holes, are in butt joint with the injection molding head end and the spray head, are used for guiding liquid and are provided with metal fixing parts and metal wires; the metal wire penetrates through the conduit, and one end of the metal wire is fixed by the metal fixing part; the metal wire and the guide pipe are tightly combined together through the metal fixing part to complete fixation, and therefore the problem that the metal wire rotates in the shaping process is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a double-connected mixing long tube and a nozzle structure of a repeatable reshapeable catheter. Background Art

[0002] During surgery, especially in cardiac surgery, plastic surgery, or complex neurosurgery, doctors need to use the same mixer to transfer liquid medicine or medical glue at different stages. A mixer is a device that mixes multiple liquid medicines, powders, or medical glues.

[0003] The drug mixer can transfer various medical glues, and has various functions such as hemostasis, sealing, isolation, and radiation protection. Its basic feature is that two syringes are loaded with two or more liquid medicines respectively, which are mixed through the drug mixer. Before the liquid medicine solidifies into glue, it is quickly sprayed out at the nozzle position, which can prevent the thick glue from clogging the fine channel of the nozzle.

[0004] As the scope of application expands, there is also a demand for the use of drug mixers in narrow channels such as endoscopes. Earlier products such as those described in patent application 201480016104.X include: a. a head component having a proximal end and a distal end, the head component including: i. a first tubular cylinder and a second tubular cylinder, each cylinder being disposed between the proximal end and the distal end of the head component, each cylinder including an outlet at the distal end of the head component; ii. a plunger extending into the proximal end of each cylinder; iii. a pressurized gas conduit, the pressurized gas conduit being disposed between the proximal end and the distal end of the head component, the gas conduit having a gas inlet at the proximal end of the head component and a gas outlet at the distal end of the head component; and iv. an attachment mechanism. , the attachment mechanism is positioned at the distal end of the head component; and b. an applicator having a proximal end and a distal end, the applicator comprising: i. a mating structure, the mating structure being positioned at the proximal end of the applicator, the mating structure being configured to releasably engage with the attachment mechanism on the head component; ii. a dispensing structure, the dispensing structure being disposed at the distal end of the applicator; iii. a first fluid channel and a second fluid channel, each fluid channel being in fluid communication with one of the outlets; and iv. a first gas channel, the first gas channel being in fluid communication with the gas outlet; and c. an actuator, the actuator being positioned on the head component for controlling the flow of pressurized fluid through the pressurized gas conduit. Therefore, the drug mixer needs to have two enhanced functions: one is that the nozzle is slender and becomes conduit-shaped; the other is that the nozzle needs to be less prone to clogging, otherwise the delivery process will be interrupted, resulting in surgical failure.

[0005] There are relatively few catheter nozzles available on the market that can be used for endoscopy. The most common ones are some that cannot be reliably shaped. Therefore, people have improved the catheter structure, combining the bendability of metal with plastic catheters. For example, patent application 202420389955.X discloses a shapeable and leak-proof double-drug mixing syringe nozzle, which includes a catheter. It is characterized by: a metal wire is provided in the middle of the catheter, and liquid medicine pipes are provided on both sides of the catheter. The front end of the catheter has a mounting hole, and a rubber nozzle is embedded in the mounting hole. Liquid medicine channels are provided on both sides of the rubber nozzle. The ends of the liquid medicine channels are slits that communicate with the nozzle. The front end of the liquid medicine pipe is connected to the liquid medicine channels on both sides of the rubber nozzle. The problem with this catheter is that the doctor needs to prepare the shaping once. If the shaping angle is incorrect, it cannot be readjusted because the metal wire in the catheter cannot be properly fixed. During the secondary shaping process, the metal wire will rotate. Once the metal wire rotates, it cannot be shaped into another shape and will slip away and retain its original shape. This makes the entire device unusable, resulting in a shaping failure.

[0006] Moreover, during the injection molding process, molten liquid material will flow in and wash away the metal wire, causing the rotating head end of the metal wire to leak out of the injection head, resulting in defective products, or the metal wire will be impacted, causing its position to move downward, and the head end of the metal wire will shift position, resulting in defective products.

[0007] Patent application 201810291603.X discloses a bendable sheath, syringe nozzle, and its application. The sheath includes a sheath head and a multi-lumen tube connected to one end of the sheath head. The multi-lumen tube is provided with a shaping lumen and at least one functional lumen. The shaping lumen is provided with a shaping wire. One end of the shaping wire extends beyond the end surface of the multi-lumen tube to form a flat positioning portion, which is embedded in the sheath head. The sheath head is provided with a channel that intersects with the functional lumen.

[0008] However, although the above-mentioned sheath structure can position the metal wire, the metal wire needs to be processed into a specific shape, and the length of the metal wire positioning part requires control of processing accuracy, which greatly increases the production cost and the complexity of the process, making it difficult for people to accept. It is inconvenient to operate in actual use and still needs further improvement. Summary of the Invention

[0009] In order to solve the above problems, the primary purpose of the present invention is to provide a double-mixed long tube structure for a repeatable shaping catheter. The long tube structure fixes the metal wire and the plastic catheter together through structural design, avoiding the rotation of the metal wire during the medical shaping process, realizing rapid and reliable shaping of the catheter, solving the problem of fixing the shaping metal wire, and achieving simple process and low cost.

[0010] Another object of the present invention is to provide a double-connected hybrid long tube structure for a reshapeable catheter. In this long tube structure, through the low-resistance flow channel design of the double-connected joint, the flow channel pressure and cross-sectional area are kept the same as the inner diameter of the tip of the syringe, and the flow channel design can be completed at low cost and high efficiency to ensure smooth outflow of the liquid.

[0011] The applicant's research has found that, due to the different materials and the generally cylindrical shape of the metal wire, metal wires are prone to rotation in plastic conduits. Flattening one end of the metal wire, while providing a certain degree of fixation, is not a stable fixation. This is because the flattened structure at one end does not secure the metal wire to the plastic conduit. The metal wire is secured by pressing the flat portion, and if the flat portion cannot be pressed, the fixation is lost. Therefore, the present application designs a specific shape for the conduit and the metal wire, tightly integrating the two and achieving structural fixation of the metal wire, thereby avoiding the problem of metal wire rotation during the shaping process.

[0012] Furthermore, not only does shaping need to be easy, but the nozzle also needs to be able to spray the fluid in the flow channel in a spray state, preventing thick glue from clogging the fine nozzle channels and facilitating mixed spraying. Therefore, the flow channel design is based on the fixed metal wire. The double-connector connecting the catheter adopts a dual flow channel splicing design. The low-resistance flow channel design ensures sufficient pressure at the nozzle end to spray the fluid in the flow channel in a spray state.

[0013] To achieve the above objectives, the technical solutions of the present invention are as follows.

[0014] A double-connected hybrid long tube structure of a re-shapeable catheter comprises an injection head, a catheter, a metal wire and a nozzle, wherein:

[0015] The injection head is used to connect the catheter and the liquid channel of the drug mixer. It has two liquid inlets on the upper end surface for docking and transferring the liquid from the syringe to the catheter. The injection head is a double-connector head, which is composed of two parts: a plastic head with two fluid holes and connected to the catheter; the other is a double-way head, which is fixed to the upper part of the plastic head and has two internal liquid channels for conveying liquid.

[0016] The upper end of the double-way head has two tubular channel entrances with Luer tapers, the center distance between the two tubular channel entrances being greater than the center distance between the two liquid holes in the catheter. The middle part of the double-way head has two inclined channels that connect the tubular channel entrances on the upper end face with the docking outlet on the lower end face. The lower end face of the double-way head has a docking outlet for docking with the two liquid holes in the catheter. The plastic head covers the double-way head from the bottom to protect and support it.

[0017] The conduit has at least two liquid holes, which are through holes and connect to the injection head and the nozzle. The two holes are used to guide the liquid and are provided with a metal fixing part for setting the metal wire;

[0018] The metal wire is inserted into the catheter and fixed at one end by a metal fixing part. The metal fixing part tightly connects the metal wire and the catheter to complete the fixation, thus avoiding the problem of metal wire rotation during the shaping process;

[0019] The nozzle is connected to the catheter to complete the spraying of the liquid.

[0020] Furthermore, the metal fixing portion is a hole provided in the catheter, and one end of the metal wire is passed through the catheter and extends into the interior of the catheter along the direction of the catheter, extending at least to the length required for shaping (usually more than 4 / 5 of the length of the catheter), and the other end of the metal wire extends into the hole of the catheter. The metal wire is deformed through the structure of the two holes, thereby being tightly combined with the plastic catheter to complete the fixation. Such a metal wire will not twist or rotate during the shaping process.

[0021] Furthermore, the two through holes of the catheter adopt a centrally symmetrical cavity, that is, the two through holes are symmetrically arranged with respect to the center of the catheter, forming a balanced cavity in the double-mixing long-tube nozzle to prevent the cross-sectional area of ​​the cavity from being reduced after being subjected to bending force during the bending process, thereby preventing the cavity from being blocked.

[0022] Furthermore, the metal wire passes through a hole in the catheter to better meet the shaping requirements.

[0023] Furthermore, the wire portion is inserted into another hole.

[0024] Furthermore, the metal wire is inserted into the two holes of the catheter at both ends, and the structure exposed outside the two holes is bent into a semicircular ring or a U-shape, or other non-linear bending shape, so that the semicircular ring of the upper part of the metal wire can remain in the injection molding head, effectively locking the upper part of the metal wire in the injection molding head so that it cannot move or rotate.

[0025] Furthermore, the two holes for the wire are symmetrical, ensuring optimal positioning of the wire. Combined with the two through-holes of the catheter, a centrally symmetrical four-hole tube is formed. The internal structure of the tube consists of two parallel tubular structures. This double-layer bending capability improves cross-sectional consistency compared to other structures. Because the four-hole tube is supported by a circular cavity at the center of the axis, when the circular cross-section tube is subjected to stress, the two layers of tubes stack together to form a three-dimensional structure, enhancing the tube's resistance to stress and deformation.

[0026] Furthermore, the metal wire is divided into three sections, namely: a metal wire fixing section, a head end insertion end, and a bendable shaping section; wherein the bendable shaping section is inserted into the catheter through a hole, has a certain length, can be manually bent to a preset shape, and effectively fixes the shape, playing a pre-bending and supporting role; the metal wire fixing section is located between the head end insertion end and the bendable shaping section, and has a semicircular ring or U-shape, which can be effectively embedded in the injection molding head and hooked and locked to ensure that the entire metal wire will not move up and down or rotate during use; the head end insertion section of the metal wire is inserted into the hole of the metal fixing part, and can be pre-fixed with the catheter before processing, so as to facilitate the control of the relative position of the metal wire and the catheter.

[0027] Furthermore, to facilitate the clamping and locking of the wire by the injection molding head, the wire fixing section is designed to be flat, enabling effective clamping and locking while also minimizing its footprint. While the wire maintains a circular cross-section for most of its length, a small section at the head is processed to create a flat surface. This design effectively secures the wire and prevents radial and axial movement of the entire dual-hybrid long-tube nozzle during use. This allows the various components of the nozzle to remain integrated regardless of the stress environment, allowing for single and double bending.

[0028] The two inclined channels of the double-way head are internal liquid channels, and their cross-sections can be circular, D-shaped, rectangular, or other shapes. The double-way head is made by hot-melt welding. After the two parts are hot-melt welded, a spliced ​​pair of parallel non-intersecting channels is formed.

[0029] Furthermore, the inclination angle of the channel is 30°. Through the 30° slope design, the channel can transfer the liquid to the two liquid channels of the four-hole tube with minimal liquid hydraulic loss in the syringe, thereby ensuring that there is sufficient pressure at the nozzle end to allow the flow channel liquid to be sprayed out in a spray state.

[0030] Typically, the injection-molded head, also known as a double-jointed head, contains a hard plastic or relatively hard soft rubber, which compresses the wire retaining section. This hard plastic or relatively hard soft rubber is processed through overmolding. This ensures that the wire is effectively secured after molding, preventing rotation or vertical movement. The connection between the injection-molded head and the catheter is overmolded, ensuring a tight bond, with no gaps for fluid to flow.

[0031] After the injection head is assembled with other components, it can be connected to the syringe module of the mixer. Its function is to conduct the liquid in the syringe into the double mixing long tube nozzle in parallel. The liquids will not mix with each other during the whole process.

[0032] The upper end face of the double-way connector is a tubular inlet with a Luer taper and a circular cross-section; the point end face is a trapezoidal cross-section design, which is used to be embedded in the injection head and fill the internal gap of the injection head, so that during use, there will be no invalid space for storing liquid, resulting in liquid remaining inside the double-connector connector and unable to be effectively pushed to the outside of the four-hole tube for normal use.

[0033] The Luer connector can be used to connect a syringe, and can also be used as a component to be assembled into a multi-lumen catheter for mixed spraying or dripping of multiple liquid medicines.

[0034] In short, the bendable and shapeable double-connected mixing long-tube nozzle structure is mainly composed of three parts, namely the injection head, the four-hole catheter and the metal wire. Structurally, it is divided into two parts: 1. Double-connected connector part: used to connect the catheter and the liquid channel of the mixer. There are two liquid inlets on the upper end face, which are used to connect the syringe liquid to the four-hole catheter. There are two liquid flow channels and a wrapped fixed shaping metal wire inside. 2. Four-hole tube part: The main function is to connect the injection head end and the nozzle. The metal wire is strong enough to pass through the catheter. 3. Metal wire: During use, the metal wire is bent and shaped into a shape that is convenient for use. After loosening, the soft rubber material of the catheter can be shaped according to the shape of the metal wire.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. The present invention's design of the metal wire, with both ends inserted into the conduit, eliminates the risk of the molten plastic flowing into the cavity impacting the wire and causing it to rotate or move up and down. This significantly improves process quality and improves the yield rate of finished products, achieving a 100% yield rate, far exceeding the industry average of 85% for overmolded injection molded products.

[0037] 2. Moreover, the double-connector of the present invention adopts an inclined double-flow channel design, which makes the flow channel have a flow channel design with minimal resistance, ensuring that there is sufficient pressure at the nozzle end to spray the flow channel liquid in a spray state; when the flow channel pressure and cross-sectional area are kept the same as the inner diameter of the tip of the syringe, only two parts are used to complete the flow channel design at low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the assembly of the double-connected hybrid long tube structure implemented by the present invention.

[0040] Figure 2 This is a schematic diagram of the decomposition of the double-connected hybrid long tube structure implemented by the present invention.

[0041] Figure 3This is a schematic structural diagram of the injection molding head implemented by the present invention.

[0042] Figure 4 This is a structural schematic diagram of the injection molding head implemented by the present invention from another angle.

[0043] Figure 5 Schematic diagram of the cross section of the catheter implemented by the present invention.

[0044] Figure 6 This is a schematic structural diagram of the metal wire implemented in the present invention.

[0045] Figure 7 This is a schematic structural diagram of the assembly of the catheter and the metal wire implemented in the present invention.

[0046] Figure 8 This is a side sectional view of the double-connected hybrid long tube structure implemented by the present invention.

[0047] Figure 9 This is a side sectional view from another angle of the double-connected hybrid long tube structure implemented by the present invention.

[0048] Explanation of the accompanying symbols: 1. Injection head; 2. Catheter; 3. Nozzle; 4. Metal wire; 11. Tubular channel inlet; 12. Plastic head; 13. Two-way head; 14. Internal liquid channel; 15. Guide plate; 16 Channel; 17. Docking outlet; 18. Fluid hole; 19. Soft glue; 21. Liquid hole; 22. Metal mounting hole; 23. Metal fixing hole; 41. Head end insertion end; 42. Metal wire fixing section; 43. Bendable shaping section. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] For easier understanding, see Figures 1 to 2 , which is a double-connected hybrid long tube structure of a repeatable reshaping catheter implemented by the present invention, including an injection head 1, a catheter 2, a metal wire 4 and a nozzle 3, wherein:

[0051] The injection head 1 is used to connect the catheter 2 and the drug liquid channel of the drug mixer. The upper end face has two tubular channel inlets 11, which are liquid inlets for docking and transferring the syringe liquid to the catheter; the injection head 1 is a double-connector head, which consists of two parts, one is a plastic head 12, which has two fluid holes 18 and is connected to the catheter 2; the other is a double-way head 13, which is fixed to the upper part of the plastic head 12 and has two internal liquid channels 14 for conveying liquid; the plastic head 12 is existing technology and will not be described here.

[0052] The upper end face of the double-way head 13 is two tubular channel inlets with Luer tapers, namely two liquid inlets 11. The center distance between the two tubular channel inlets 11 is greater than the center distance between the two liquid holes in the four-hole tube; the middle part of the double-way head is two inclined channels 16, which connect the tubular channel inlets 11 on the upper end face and the four-hole tube docking outlet on the lower end face; the lower end face of the double-way head 13 has two docking outlets 17 for docking with the two fluid holes 18 of the plastic head 12, and the two fluid holes 18 are docked with the two liquid holes 21 of the catheter 2; the plastic head 12 covers the double-way head 13 from the bottom, protecting and supporting it.

[0053] The conduit 2 has at least two liquid holes 21. The two liquid holes 21 are through holes, connecting the injection head 1 and the nozzle 3. The two holes are used to guide the liquid and are provided with a metal fixing part for setting the metal wire.

[0054] The metal fixing part is a metal fixing hole 23 provided in the conduit, and one end of the metal wire is passed through the conduit 2 (specifically the metal mounting hole 22), and extends into the interior of the conduit along the direction of the conduit, extending at least to the length required for shaping (usually more than 4 / 5 of the length of the conduit to complete the shaping work. For the convenience of production, one end of the metal wire is passed through the conduit, usually extending into the interior of the conduit along the direction of the conduit, and passing through the conduit), and the other end of the metal wire extends into the metal fixing hole 23 of the conduit. The structure of the two holes causes the metal wire 4 to be deformed, thereby being tightly combined with the plastic conduit to complete the fixation. Such a metal wire will not twist or rotate during the shaping process.

[0055] A metal wire 4 is inserted into the conduit 2 and secured at one end by a metal fixing portion. In the diagram, the metal fixing portion is a hole in the conduit, called a metal fixing hole 23. This hole tightly connects the wire to the conduit, securing it and preventing the wire from rotating during the shaping process. The other end of the wire 4 is inserted into a metal mounting hole 22 in the conduit 2.

[0056] The nozzle 3 is connected to the conduit 2 to complete the spraying of the liquid. The nozzle 3 is a prior art and will not be described in detail here.

[0057] Combine Figure 3 、 4 As shown, the upper end face of the double-way connector 13 is a tubular channel inlet 11 with a Luer taper, and its cross-section is a circular ring; the point end face is a trapezoidal cross-section design, which is used to be embedded in the injection head and fill the internal gap of the injection head, so that during use, there will be no invalid space for storing liquid, resulting in liquid remaining in the double-way connector and unable to be effectively pushed out of the catheter for normal use.

[0058] The Luer connector can be used to connect a syringe, and can also be used as a component to be assembled into a multi-lumen catheter for mixed spraying or dripping of multiple liquid medicines.

[0059] In the injection molding head 1, the double-pass head 13 has two guide plates 15, each of which has an inclined channel 16 disposed therein. The channels 16 are arranged on the guide plates 15 to facilitate rapid prototyping of the channels 16, simplifying the manufacturing process. The two inclined channels 16 serve as internal liquid passages, and their cross-sections can be circular, D-shaped, rectangular, or other shapes. Typically, the channels 16 taper to facilitate docking with the two liquid ports 21 of the conduit 2. During manufacturing, the double-pass head 13 is formed by heat-melting, where two symmetrical parts are heat-melted together to form a pair of parallel, non-intersecting channels.

[0060] The inclination angle of the channel 16 in the guide plate 15 is set to 30°. Through the 30° slope design, the channel can transfer the liquid to the two liquid channels of the four-hole tube with minimal hydraulic loss of the liquid in the syringe, thereby ensuring that there is sufficient pressure at the nozzle end to spray the flow channel liquid in a spray state.

[0061] For catheter 2, combined Figure 5 As shown, the catheter 2 has four holes, among which the two liquid holes 21 adopt a centrally symmetrical cavity, that is, the two through holes are symmetrically arranged with respect to the center of the catheter, forming a balanced cavity in the double-mixing long-tube nozzle to prevent the cross-sectional area of ​​the cavity from being reduced after being subjected to bending force during the bending process, which may cause the cavity to be blocked; a metal mounting hole 22 and a metal fixing hole 23 are provided in another direction. The metal mounting hole 22 usually passes through the catheter 2 to facilitate the shaping of the metal wire 4; a part of the metal wire is inserted into the metal fixing hole 23 to fix the metal wire.

[0062] The metal wire 4 is partially inserted into the metal fixing hole 23 to complete the fixation.

[0063] Reference Figure 6As shown, the metal wire 4 is divided into three sections: a metal wire fixing section 42, a head end insertion section 41, and a bendable and shaped section 43. The bendable and shaped section 41 is inserted into the conduit 2 through the metal mounting hole 22. It has a certain length and can be manually bent into a preset shape, effectively fixing the shape, and playing a pre-bending and supporting role. The metal wire fixing section 42 is located between the head end insertion section 41 and the bendable and shaped section 43. It has a semicircular ring or U-shape, or other non-linear bending shape. It can be effectively embedded in the injection head 1 (specifically, the plastic head 12) and is compressed or hooked and locked to ensure that the entire metal wire does not move up and down or rotate during use. The metal wire head end insertion section 41 is inserted into the metal fixing hole 23 and can be pre-fixed with the conduit before processing, conveniently controlling the relative position of the metal wire and the conduit. The metal wire fixing section 42 is inserted into the plastic head 12 across the center of the conduit, which can effectively isolate the other two liquid holes 21 while ensuring that the injection head keeps the metal wire hidden.

[0064] The symmetrical distribution of metal mounting holes 22 and metal fixing holes 23 ensures optimal positioning of the metal wire 4. Combined with the two liquid ports 21 of the catheter 2, a centrally symmetrical four-hole catheter is formed. This creates a dual-layered, parallel structure with two tubular shapes. This double-layered bending capability offers superior cross-sectional consistency compared to other structures. Because the four-hole tube is supported by a circular cavity at the center, the circular cross-section tube, when subjected to stress, is formed by two layers of tubular material stacked together to form a three-dimensional structure, enhancing its resistance to internal deformation.

[0065] The catheter is designed with four holes, two of which are symmetrical holes for fixing the head end of the metal wire, and the other two symmetrical holes for passing the liquid medicine. Due to the functional requirements of the mixer for the double-mixing long tube nozzle, two separate liquid channels are required in the sheath part, which cannot be connected to each other. The metal wire is inserted into the plastic head 12 across the center of the catheter, which can just meet the requirements of the injection head to keep the metal wire from being exposed, and effectively isolate the other two symmetrical holes, so that when different liquid medicines pass through, there will be no mixing of the liquid medicines at the connection.

[0066] The four-hole catheter can better maintain its original cross-sectional area without major changes after bending, so that the entire double-mixing long-tube nozzle is not affected by whether it is bent during use, ensuring the liquid cross-section of the two effective cavities of the entire four-hole catheter, thereby ensuring that the double-mixing long-tube nozzle is not affected by bending.

[0067] Furthermore, the metal mounting holes 22, the metal fixing holes 23 and the two liquid holes 21 are designed to be symmetrically distributed at equal distances from the center, which not only strengthens the tube structure, but also increases the utilization rate of the space inside the tube. If the outer diameter of the tube can be made smaller for a double-mixed long-tube nozzle with the same cross-sectional area, it will be more advantageous to use and can be used in surgeries in narrow spaces, which will greatly reduce the area of ​​the wound surface. A circular cross-sectional design can achieve a higher utilization rate inside the tube. The circle is the shape with the highest space utilization rate. If the interior of the double-mixed long-tube nozzle is also made into four centrally symmetrical circles, the utilization rate of the interior of the double-mixed long-tube nozzle can be greatly increased. If a concentric circle cross-sectional design is adopted, if the liquid flow rate or cross-sectional area requirements are the same, the outer diameter will be smaller than that of a double-mixed long-tube nozzle with a non-concentric circle cross-sectional design.

[0068] To facilitate the clamping and locking of the wire by the injection molding head, the wire fixing section can be designed to be flat, enabling effective clamping and locking while also minimizing its footprint. While the wire maintains a circular cross-section for most of its length, a small section at the head is processed to create a flat surface. This design effectively secures the wire and prevents radial and axial movement of the entire dual-hybrid long-tube nozzle during use. This allows the various components of the nozzle to remain integrated regardless of the stress environment, allowing for single and double bending.

[0069] In this way, the wire fixing section 42 of the wire is embedded in the double head before the double mixing long tube nozzle is injection molded. After the double head is processed, the end of the wire that is processed into a plane will form a good fixing method with the material of the double head. It can not only prevent the wire from rotating in the radial direction after being subjected to force, but also fix it well in the axial direction, so that the wire cannot move up and down.

[0070] The characteristic of the head of this wire is that it simply creates a flat surface on the original circular surface, which does not significantly change the length, width, or height of the wire. Therefore, the size of the double head can be designed to be smaller, and there is no need to deliberately design space for the wire to be fixed. For two double-mixed long-tube nozzles with the same function, if the double-mixed long-tube nozzle uses this wire, its size can be smaller and more delicate. Firstly, the user's vision will not be blocked by the excessive size of the double-mixed long-tube nozzle during use. Secondly, when the double-mixed long-tube nozzle is used as a spare part and combined with other parts, the overall size of the product can be made smaller and more convenient to use.

[0071] In the actual processing, for the convenience of processing, two sections of metal wire can be inserted into the two holes of the catheter respectively, and then the two sections of metal wire are welded together.

[0072] Combine Figure 8、 9 As shown, the double-connected hybrid long-tube nozzle of the present invention adopts a centrally symmetrical cavity to form a balanced cavity in the catheter to prevent the cross-sectional area of ​​the cavity from being reduced after being subjected to bending force during the bending process of the catheter, thereby preventing the cavity from being blocked. At the same time, the catheter is a centrally symmetrical four-hole tube, and the internal structure of the tube is a two-tube parallel structure. The double-layer bending ability is better than other structures in maintaining cross-sectional consistency. Because there is a circular cavity supporting the center of the four-hole tube axis, the circular cross-section tube has two layers of tubes superimposed to form a three-dimensional structure after being subjected to force, and the ability to resist force deformation inside the tube is enhanced.

[0073] The upper end of the double-pass head is a tubular inlet 11 with a Luer taper. The liquid flows along Figure 8 The direction of the arrow shown enters the two-way head through the internal liquid channel 14, then passes through the channel 16, enters the fluid hole 18, then enters the conduit 2, and then passes through the conduit 2 to be ejected from the nozzle 3.

[0074] The center distance between the two holes of the catheter is similar to the center distance between the two parallel ends of the metal wire, which makes it easy to insert the metal wire into the four-hole catheter during the production process.

[0075] Due to the support of the circular cavity in the center of the axis, the four-hole catheter can better maintain the original cross-sectional area without major changes after bending, so that the entire double-mixing long-tube nozzle is not affected by whether it is bent during use, ensuring the liquid cross-section of the entire four-hole catheter in the two effective cavities, thereby ensuring that the double-mixing long-tube nozzle is not affected by bending.

[0076] Typically, the injection-molded head (plastic head 12) contains a hard plastic or relatively hard soft rubber 19, which compresses the wire retaining section 42. This hard plastic or relatively hard soft rubber is processed by overmolding; after molding, it effectively secures the wire without rotation or vertical movement. The connection between the injection-molded head and the catheter is an integrally molded process, where the two are tightly bonded, leaving no gaps for liquid to flow.

[0077] After the injection head 1 is assembled with other components, it can be connected to the syringe module of the mixer. Its function is to conduct the liquid in the syringe in parallel to the double mixing long tube nozzle. The liquids will not mix with each other during the whole process.

[0078] The upper end surface of the above-mentioned double mixing long tube nozzle structure can be directly connected or transferred through other parts to achieve the liquid outlet of the docking double syringe mixer, connect the flow channel of the syringe, and transfer the liquid in the syringe to the lower end surface of the double mixing long tube nozzle.

[0079] In short, the bendable and shapeable double-tube mixing long-tube nozzle structure is mainly composed of four parts, namely the injection head, the catheter, the metal wire and the nozzle. 1. The injection head is also the double-connected joint part: it is used to connect the catheter and the liquid channel of the mixer. There are two liquid inlets on the upper end face, which are used to connect the syringe liquid to the four-hole catheter. There are two liquid flow channels and a wrapped fixed shaping metal wire inside. 2. The catheter part: its main function is to connect the injection head end and the nozzle. The metal wire is strong enough to pass through the catheter. 3. Metal wire: During use, the metal wire is bent and shaped into a shape that is convenient for use. After loosening, the soft rubber material of the catheter can be shaped according to the shape of the metal wire. 4. Nozzle 3 completes the liquid spraying work.

[0080] The upper end surface of the above-mentioned double mixing long tube nozzle can be directly connected or transferred through other parts to achieve the liquid outlet of the docking double syringe mixer, connect the flow channel of the syringe, and transfer the liquid in the syringe to the lower end surface of the double mixing long tube nozzle.

[0081] In summary, the metal wire design of the present invention, with both ends inserted into the conduit, eliminates the risk of the molten liquid material flowing into the cavity impacting the wire during processing, causing it to rotate or move up and down. This significantly improves processing technology and product yield, achieving a 100% yield rate, far exceeding the industry average of 85% for overmolded injection molded products.

[0082] Furthermore, the present invention uses a U-structured metal wire, wherein a portion of the U-shaped head is designed inside the injection molding head and the other portion is placed inside the catheter, so that the catheter can become a four-hole tube with better bending resistance.

[0083] The head structure of the present invention is designed so that the metal wire is exposed in the conduit portion, and can be clamped in the injection molding head, so that the metal wire and the conduit are assembled and fixed, and the positioning function during the processing can be achieved.

[0084] The double-connector of the present invention adopts an inclined double-flow channel design and a flow channel design with low resistance, which ensures that there is sufficient pressure at the nozzle end to spray the flow channel liquid in a spray state; the flow channel pressure and cross-sectional area are kept the same as the inner diameter of the tip of the syringe, and the flow channel design can be completed at low cost and high efficiency using only two parts.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-connected hybrid long tube structure for a re-shapeable catheter, comprising an injection head, a catheter, a metal wire, and a nozzle, characterized in that: The injection head is used to connect the catheter and the liquid channel of the drug mixer. It has two liquid inlets on the upper end surface for docking and transferring the liquid from the syringe to the catheter. The injection head is a double-connector head, which is composed of two parts: a plastic head with two fluid holes and connected to the catheter; the other is a double-way head, which is fixed to the upper part of the plastic head and has two internal liquid channels for conveying liquid. The upper end of the double-way head has two tubular channel entrances with Luer tapers, and the center distance between the two tubular channel entrances is greater than the center distance between the two liquid holes in the catheter. The middle part of the double-way head has two inclined channels that connect the tubular channel entrances on the upper end face with the docking outlet on the lower end face. The lower end face of the double-way head has a docking outlet for docking with the two liquid holes in the catheter. The plastic head covers the two-way head from the bottom to protect and support it; The conduit has at least two liquid holes, which are through holes and connect to the injection head and the nozzle. The two holes are used to guide the liquid and are provided with a metal fixing part for setting the metal wire; A metal wire is passed through the conduit and fixed at one end by a metal fixing portion; The nozzle is connected to the conduit to complete the spraying of the liquid.

2. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 1, characterized in that: The metal fixing part is a hole set in the catheter, and one end of the metal wire is passed through the catheter and extends into the interior of the catheter along the direction of the catheter, extending to at least 4 / 5 of the length of the catheter. The other end of the metal wire extends into the hole of the catheter. The structure of the two holes causes the metal wire to be deformed, thereby being tightly combined with the plastic catheter to complete the fixation.

3. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 1, characterized in that: The two through holes of the catheter adopt a central symmetrical cavity, that is, the two through holes are symmetrically arranged with respect to the center of the catheter, forming a balanced cavity in the double-mixing long-tube nozzle.

4. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 2, characterized in that: The metal wire passes through a hole in the catheter to better meet the shaping requirements.

5. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 4, characterized in that: The wire portion is inserted into the other hole.

6. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 5, characterized in that: The metal wire is inserted into the two holes of the catheter at both ends, and the structure exposed outside the two holes is bent into a semicircular ring or a U shape.

7. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 5, characterized in that: The two holes of the metal wire are symmetrical, and combined with the two through holes of the catheter to form a centrally symmetrical four-hole tube. The internal structure of the tube is two tubular parallel structures, and the double-layer bending ability is better than other structures in maintaining cross-sectional consistency.

8. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 6, characterized in that: The metal wire is divided into three sections, namely: a metal wire fixing section, a head end insertion end, and a bendable shaping section; wherein the bendable shaping section is inserted into the catheter through a hole, has a certain length, can be manually bent to a preset shape, and effectively fixes the shape, playing a pre-bending and supporting role; the metal wire fixing section is located between the head end insertion end and the bendable shaping section, and has a semicircular ring or U-shape, which can be effectively embedded in the injection molding head and hooked and locked to ensure that the entire metal wire will not move up and down or rotate during use, and the metal wire fixing section is inserted into the plastic head across the center of the catheter, which can effectively isolate the two liquid holes while ensuring that the injection molding head keeps the metal wire from being exposed; the head end insertion section of the metal wire is inserted into the hole of the metal fixing part, and can be pre-fixed with the catheter of the four-hole tube before processing, so as to facilitate the control of the relative position of the metal wire and the catheter.

9. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 8, characterized in that: The metal wire fixing section is designed to be flat, which can be clamped and locked well, while also reducing the space it occupies.

10. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 1, characterized in that: The two inclined channels of the double-way head are internal liquid channels, and their cross-sections are circular, D-shaped or rectangular; the double-way head is made of two symmetrical parts that are hot-melt welded. After the two parts are hot-melt welded, they form a spliced ​​pair of parallel non-intersecting channels.

11. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 10, characterized in that: The inclination angle of the channel is 30°. Through the design of the inclination angle, the channel can transfer the liquid to the two liquid channels of the four-hole tube with minimal loss of liquid hydraulic pressure in the syringe.

12. The double-connected hybrid long tube structure of the reshapeable catheter according to claim 8, characterized in that: The double joint head is provided with hard plastic or relatively hard soft rubber, and the metal wire fixing section is pressed by the hard plastic or relatively hard soft rubber.

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