An integrated injection device suitable for dual lumen PICC catheter locking

Abstract

The application discloses a kind of integrated injection device suitable for double-lumen PICC catheter tube, it is related to syringe technical field, to solve the technical problem of single function of injection device, including double-lumen injection shell, two injection heads, moving assembly, double-piston assembly, transmission mechanism and gear set.The application is designed transmission mechanism and gear set structure, so that when the clamping block is connected with the rotating hole, the gear ring can rotate relative to the cylinder, the moving assembly makes the gear ring rotate relative to the cylinder, so that the first gear C is driven by gear A intermittent rotation, so that double-piston assembly intermittent movement realizes pulse injection, when the clamping block is connected with the rotating ring, moving assembly, so that the gear ring and cylinder rotate simultaneously, so as to realize continuous injection, simple operation can realize two injection modes, solve the technical problem of single function of current injection device.

Description

An integrated injection device for sealing dual-lumen PICC catheters Technical Field

[0001] This invention relates to the field of syringe technology, and more specifically, to an integrated injection device suitable for sealing dual-lumen PICC catheters. Background Technology

[0002] In clinical medicine, peripherally inserted central catheters (PICCs) are widely used in scenarios such as tumor chemotherapy, parenteral nutrition support, and intensive care due to their ability to remain in place for extended periods and reduce the pain of repeated punctures. Dual-lumen PICCs, in particular, can simultaneously meet multiple needs including intravenous infusion, blood collection, and monitoring, further enhancing their clinical applicability. However, dual-lumen PICCs require a sealing procedure after use. This involves injecting normal saline or heparinized saline to remove residual medication and blood components from the catheter wall, preventing catheter blockage, thrombosis, and infection. The quality of this sealing directly affects the catheter's lifespan and patient safety.

[0003] Clinical catheter sealing typically employs two methods: pulsed sealing and continuous sealing. Traditional injection devices are single-function and require manual control of the injection rhythm by medical staff. Pulsed sealing, in particular, requires manual control of the injection-pause-injection alternation, which enhances the flushing force on the catheter inner wall through the turbulent effect of the drug solution. Relying on personal experience to judge the pause interval and injection force, problems such as irregular pulse frequency and excessive pressure fluctuations are prone to occur. If the pressure peak is too high, it will irritate and damage the vascular endothelium. If the pressure is insufficient or the pulse interval is too long, effective turbulence cannot be formed, making it difficult to remove stubborn residues. The operation is not easy. In view of this, we propose an integrated injection device suitable for sealing dual-lumen PICC catheters. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated injection device suitable for sealing dual-lumen PICC catheters, so as to solve the technical problem of single-function injection devices.

[0005] To solve the above technical problems, the present invention provides the following technical solution: an integrated injection device suitable for sealing dual-lumen PICC catheters, comprising a dual-lumen injection shell, a transmission mechanism and a gear set, wherein two injection heads are fixedly provided at the head end of the dual-lumen injection shell, and a moving component and a dual-piston component are provided on the dual-lumen injection shell;

[0006] The transmission mechanism includes a column, two meshing gears B, a rotating ring, and a snap-fit ​​assembly. A first connecting shaft is rotatably mounted on the column, and a gear A is fixed on the first connecting shaft. Both gears B are rotatably mounted on the column, with the upper gear B meshing with gear A. The rotating ring is rotatably mounted on the surface of the column, and a toothed ring is fixed on the rotating ring. The toothed ring meshes with the output end of the moving component. An arc-shaped groove is formed on the inner edge of the toothed ring, and the arc-shaped groove meshes with the lower gear B. The snap-fit ​​assembly is mounted on the column, and the rotating hole and the rotating ring are snap-fitted with the movable end of the snap-fit ​​assembly. The gear set includes a first gear C, which meshes with the input end of the dual-piston assembly. The first gear C and gear A are connected through a gear unit, causing the first gear C and gear A to rotate in the same direction. This invention designs a transmission mechanism and gear set structure so that when the locking block engages with the rotating hole, the gear ring can rotate relative to the column. The moving component allows the gear ring to rotate relative to the column, thereby causing gear A to drive the first gear C to rotate intermittently. This intermittent movement of the dual piston assembly enables pulse injection. When the locking block engages with the rotating ring, the moving component causes the gear ring and the column to rotate simultaneously, thereby enabling continuous injection. The invention is simple to operate and can achieve two injection modes, solving the technical problem of the current injection device having only one function.

[0007] Preferably, the tooth tip surface of gear B is in sliding fit with the inner edge surface of the gear ring.

[0008] Preferably, the dual-cavity injection shell has two circular grooves at its tail end, with an injection cavity at the head end of each groove. Parallel grooves A and B are formed at the top of the bottom grooves. A rotating hole is formed on one side of the dual-cavity injection shell, and the column is rotatably mounted on the rotating hole. A mounting cavity is connected to the rotating hole, and the first gear C is rotatably mounted on the mounting cavity. Both grooves A and B are connected to the mounting cavity. An annular groove is formed on the surface of the rotating hole near the mounting cavity, and the rotating ring is rotatably connected to the annular groove. Several snap-fit ​​grooves A are formed in a ring-shaped, equally spaced structure in the middle of the rotating hole. A sleeve is fixed to the tail end of the dual-cavity injection shell, and a mounting groove is formed at the tail end of the sleeve.

[0009] Preferably, the two injection heads are respectively connected to the two injection cavities. The inner surface of the injection head is provided with a groove, and an elastic ring is fixed on the groove. The inner diameter of the elastic ring gradually increases from the middle to both sides. The inner surface of the elastic ring has a wave structure, and the interior of the elastic ring is hollow to form a deformation gas cavity. The inner surface of the injection head away from the mounting cavity is provided with several sets of turbulence balls. The several sets of turbulence balls are arranged alternately, and each set of turbulence balls includes multiple balls arranged in a ring-shaped and equally spaced structure.

[0010] Preferably, the moving component includes two slide rods and a motor. The motor is fixed in the mounting groove. The two slide rods are respectively disposed on the two circular grooves. The two slide rods are fixedly connected by a pressure block. Each of the two slide rods has a sliding groove C at its opposite end. A rack A is fixed on the lower slide rod at a position opposite to the sliding groove A. The rack A is meshed with the rack A. A lead screw is threaded onto the pressure block. One end of the lead screw is rotatably connected to the tail end of the dual-cavity injection shell. The other end of the lead screw passes into the mounting groove and is fixedly connected to the motor output shaft.

[0011] Preferably, the dual-piston assembly includes two piston units and two piston rods. The two piston units are movably disposed on the two injection chambers, and the two piston rods are disposed on the two slide grooves C. The piston rods pass through the injection chambers and are fixedly connected to the piston units. The two piston rods are fixedly connected by a sliding plate. The two ends of the sliding plate are slidably connected to the two slide grooves C. A rack B is fixedly disposed on the piston rod at the bottom end relative to the slide groove B. The first gear C meshes with the rack B.

[0012] Preferably, the column has a circular cavity inside, and the surface of the column has a plurality of centripetal grooves that communicate with the circular cavity in an annular, equally spaced structure.

[0013] Preferably, the inner surface of the rotating ring has a plurality of snap-fit ​​grooves B in an annular, equally spaced structure, and the number of the plurality of snap-fit ​​grooves B is equal to the number of the plurality of snap-fit ​​grooves A.

[0014] Preferably, the snap-fit ​​assembly includes a circular block, a plurality of slide bars, and a threaded rod. The circular block is movably disposed within the circular cavity. The plurality of slide bars are slidably disposed on a plurality of radial grooves. The plurality of slide bars are all fixedly connected to the circular block. A movable groove is provided at the eccentric end of each slide bar. A snap-fit ​​block is movably connected to the movable groove. Both ends of the snap-fit ​​block are provided with inclined guide surfaces. The snap-fit ​​block and the movable groove are elastically connected by a spring. The threaded rod is rotatably disposed within the circular cavity and threadedly connected to the circular block. The end of the threaded rod away from the mounting cavity extends out of the circular block and is fixedly fitted with a torsion block.

[0015] The number of several snap-fit ​​slots B is an integer multiple of the number of several snap-fit ​​blocks, and the snap-fit ​​blocks are engaged with the snap-fit ​​slots A and the snap-fit ​​blocks are engaged with the snap-fit ​​slots B.

[0016] Preferably, the gear unit includes two meshing parrot gears, one of which is fixed to one end of the first coupling shaft near the first gear C, and the other parrot gear is rotatably connected to the mounting cavity via a second coupling shaft, on which a second gear C meshes with the first gear C.

[0017] The beneficial effects of this invention are:

[0018] 1. This invention, through the design of a transmission mechanism and gear set structure, enables the gear ring to rotate relative to the column when the locking block engages with the rotating hole. The moving component allows the gear ring to rotate relative to the column, thereby causing gear A to drive the first gear C to rotate intermittently. This intermittent movement of the double piston assembly achieves pulse-type injection. When the locking block engages with the rotating ring, the moving component causes the gear ring and the column to rotate simultaneously, thereby achieving continuous injection. The simple operation enables two injection modes, solving the technical problem of the current injection device having only one function.

[0019] 2. This invention, through the structural design of the injection head, creates a Venturi tube structure by varying the inner diameter of the elastic ring. The flow velocity of the liquid naturally increases as it passes through the narrow middle section, then decreases upon entering the wider section, forming basic turbulence. The wavy inner surface causes periodic contraction and expansion disturbances in the fluid during flow. Each wave unit creates a local vortex. This, combined with the turbulence generated by the Venturi effect, results in the annular turbulence-inducing spheres staggered downstream of the elastic ring breaking up and recombining the existing turbulence, decomposing large-scale vortices into smaller... The multi-scale eddies and complex turbulence effectively flush away drug residues and fibrin deposits on the inner wall of the catheter, improving the sealing effect. When using the pulse sealing method, the deformation air chamber inside the elastic ring absorbs the peak pressure of the drug solution through deformation. Under high pressure, the air chamber is compressed, which increases the inner diameter of the elastic ring and reduces the local flow velocity. Under low pressure, the air chamber rebounds, which reduces the inner diameter and maintains the flow velocity. This effectively reduces the pressure fluctuation amplitude at the catheter tip, maintaining the flushing force of turbulence while reducing the mechanical stimulation of the vascular endothelium caused by the severe pressure impact of traditional pulse sealing.

[0020] 3. Through further design of gear B, this invention enables the inner edge of the gear ring to rotate and limit gear B when gear B disengages from the arc tooth groove. This ensures that when the gear ring rotates relative to gear B, neither gear B nor gear A rotates, thus guaranteeing the stability of the dual-piston assembly during pulse injection intervals and improving the stability of pulse injection.

[0021] 4. This invention, through the structural design of the gear unit, utilizes the speed variation during the meshing transmission of two parrot gears. This allows the rotational speed of the first gear C to change regularly, whether rotating continuously or intermittently. Therefore, during continuous injection, the rotational speed of the first gear C exhibits periodic variations in speed. This variation is transmitted to the rack B and piston unit, causing regular fluctuations in the drug delivery speed. In continuous injection mode, this creates a gentle pulse effect, enhancing the flushing effect on the inner wall of the catheter. Simultaneously, in pulsed injection, in the intermittent pulsed injection mode, the speed variation characteristics of the parrot gears coordinate with the intermittent rotation of gear B. Gear B rotates from slow to fast and then abruptly stops. The rapid rotation to abrupt stop of gear B creates stronger turbulence, increasing the flushing force. Simultaneously, as gear B rotates from slow to fast, the delivery speed of the piston unit increases slowly, causing the pressure inside the catheter to rise steadily. This allows the vascular endothelium to gradually adapt to the changes in flow rate, reducing the risk of vascular irritation. This, combined with the strong flushing effect of the subsequent rapid rotation to abrupt stop, creates a flexible yet rigid combination, achieving effective flushing under safe conditions. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a schematic cross-sectional view of the overall structure of the present invention;

[0024] Figure 3 is an enlarged schematic diagram of part A of Figure 2;

[0025] Figure 4 is a partial structural breakdown diagram of the present invention;

[0026] Figure 5 is an enlarged schematic diagram of the structure of part B in Figure 4;

[0027] Figure 6 is a partial structural schematic diagram of the present invention;

[0028] Figure 7 is a schematic diagram of the disassembled structure of the moving component and the dual-piston component of the present invention;

[0029] Figure 8 is a schematic diagram of the transmission mechanism and gear set of the present invention;

[0030] Figure 9 is a schematic diagram of the disassembled structure of the transmission mechanism and gear set of the present invention;

[0031] Figure 10 is a partial cross-sectional schematic diagram of the transmission mechanism of the present invention;

[0032] Figure 11 is an enlarged schematic diagram of the structure of section C in Figure 10;

[0033] Figure 12 is a schematic diagram of the structure of the rotating ring and toothed ring of the present invention;

[0034] Figure 13 is a partial structural breakdown diagram of the transmission mechanism of the present invention;

[0035] Figure 14 is a partial structural schematic diagram of the gear set of the present invention.

[0036] Explanation of the labels in the diagram:

[0037] 1. Dual-chamber injection shell; 2. Injection head; 3. Moving assembly; 4. Dual-piston assembly; 5. Transmission mechanism; 6. Gear set;

[0038] 11. Circular groove; 12. Injection cavity; 13. Slide groove A; 14. Slide groove B; 15. Rotating hole; 16. Mounting cavity; 17. Annular groove; 18. Snap-fit ​​groove A; 19. Housing;

[0039] 21. Elastic ring; 22. Deformation air cavity; 23. Baffle ball;

[0040] 31. Slide rod; 32. Pressure block; 33. Slide groove C; 34. Rack A; 35. Lead screw; 36. Motor;

[0041] 41. Piston unit; 42. Piston rod; 43. Slide plate; 44. Rack B;

[0042] 51. Column; 52. Gear A; 53. Gear B; 54. Rotary ring; 55. Snap-fit ​​assembly; 56. Gear ring;

[0043] 511. Circular cavity;

[0044] 512. Centripetal groove;

[0045] 541. Snap-fit ​​groove B; 561. Arc tooth groove;

[0046] 551. Round block; 552. Sliding bar; 553. Movable groove; 554. Snap-fit ​​block; 555. Spring; 556. Threaded rod; 557. Torsion block;

[0047] 61. First gear C; 62. Parrot gear; 63. Second gear C. Detailed Implementation

[0048] As shown in Figures 1 to 14, the present invention relates to an integrated injection device suitable for sealing dual-lumen PICC catheters, comprising a dual-lumen injection shell 1, two injection heads 2, a moving assembly 3, a dual-piston assembly 4, a transmission mechanism 5, and a gear set 6.

[0049] In an embodiment of the present invention, as shown in FIG4, the tail end of the dual-cavity injection shell 1 has two circular grooves 11, the head end of the circular groove 11 has an injection cavity 12, and the top end of the circular groove 11 at the bottom end has parallel sliding grooves A13 and B14. The side of the dual-cavity injection shell 1 has a rotating hole 15, and the rotating hole 15 is connected to an installation cavity 16. Sliding grooves A13 and B14 are both connected to the installation cavity 16. The surface of the rotating hole 15 near the installation cavity 16 has an annular groove 17. The middle part of the rotating hole 15 has a number of snap-fit ​​grooves A18 in an annular and equally spaced structure. The tail end of the dual-cavity injection shell 1 is fixed with a sleeve 19, and the tail end of the sleeve 19 has an installation groove.

[0050] In an embodiment of the present invention, as shown in FIG3, two injection heads 2 are fixedly mounted on the head end of the double-cavity injection shell 1 and are respectively connected to two injection cavities 12. The inner surface of the injection head 2 is provided with a groove, and an elastic ring 21 is fixedly mounted on the groove. The inner diameter of the elastic ring 21 gradually increases from the middle to both sides. The inner surface of the elastic ring 21 has a wave structure, and the interior of the elastic ring 21 is hollow to form a deformation gas cavity 22. Several sets of turbulence balls 23 are provided on the side of the inner surface of the injection head 2 away from the mounting cavity 16. The several sets of turbulence balls 23 are arranged alternately, and each set of turbulence balls 23 includes multiple ones arranged in a ring-shaped and equally spaced structure. This invention, through the structural design of the injection head 2, creates a Venturi tube structure by varying the inner diameter of the elastic ring 21. The flow velocity of the liquid naturally increases as it passes through the narrow middle section, decreasing upon entering the wider section, thus forming basic turbulence. The wavy inner surface causes periodic contraction and expansion disturbances in the fluid during flow. Each wave unit generates a local vortex, which, combined with the turbulence generated by the Venturi effect, allows the staggered annular turbulence spheres 23 downstream of the elastic ring 21 to break up and reassemble the existing turbulence, decomposing the large-scale vortex into smaller... The multi-scale eddies and this complex turbulence can effectively flush away drug residues and fibrin deposits on the inner wall of the catheter, improving the sealing effect. When the pulse sealing method is used, the deformation air chamber 22 inside the elastic ring 21 absorbs the peak pressure of the drug solution through deformation. Under high pressure, the air chamber is compressed, which increases the inner diameter of the elastic ring 21 and reduces the local flow velocity. Under low pressure, the air chamber rebounds, which reduces the inner diameter and maintains the flow velocity. This can effectively reduce the pressure fluctuation amplitude at the end of the catheter, maintain the flushing force of turbulence, and reduce the mechanical stimulation of the vascular endothelium caused by the severe pressure impact of traditional pulse sealing.

[0051] In an embodiment of the present invention, as shown in FIG7, the moving component 3 includes two slide rods 31 and a motor 36. The motor 36 is fixedly mounted in the mounting groove. The two slide rods 31 are respectively mounted on two circular grooves 11. The two slide rods 31 are fixedly connected by a pressure block 32. Each of the two slide rods 31 has a sliding groove C33 at its opposite end. A rack A34 is fixedly mounted on the lower slide rod 31 relative to the sliding groove A13. A lead screw 35 is threadedly connected to the pressure block 32. One end of the lead screw 35 is rotatably connected to the tail end of the double-cavity injection shell 1, and the other end of the lead screw 35 passes through the mounting groove and is fixedly connected to the output shaft of the motor 36. Through the above arrangement, the present invention enables the output shaft of the motor 36 to rotate, thereby driving the lead screw 35 to rotate, which allows the pressure block 32 to drive the two slide rods 31 to slide relative to the two circular grooves 11.

[0052] In an embodiment of the present invention, as shown in FIG7, the dual-piston assembly 4 includes two piston units 41 and two piston rods 42. The two piston units 41 are respectively movably disposed on two injection chambers 12, and the two piston rods 42 are respectively disposed on two sliding grooves C33. The piston rods 42 pass through the injection chambers 12 and are fixedly connected to the piston units 41. The two piston rods 42 are fixedly connected by a sliding plate 43. The two ends of the sliding plate 43 are respectively slidably connected to the two sliding grooves C33. A rack B44 is fixedly provided on the piston rod 42 at the bottom end relative to the sliding groove B14. With the above arrangement, as shown in FIG7, the sliding plate 43 has a through hole at the position relative to the lead screw 35, so that the two piston rods 42 move together under the action of the sliding plate 43, which can simultaneously drive the two piston units 41 to move synchronously, facilitating the ejection and suction of liquid in the two injection chambers 12.

[0053] In an embodiment of the present invention, as shown in Figures 5, 8, 10, 11, 12, and 13, the transmission mechanism 5 includes a column 51, two meshing gears B53, a rotating ring 54, and a snap-fit ​​assembly 55. The column 51 is rotatably mounted on the rotating hole 15. A first connecting shaft is rotatably mounted on one end of the column 51 near the mounting cavity 16. A gear A52 is fixed on the first connecting shaft. Both gears B53 are rotatably mounted on the end of the column 51 near the mounting cavity 16. The gear B53 located on the upper side meshes with the gear A52. The rotating ring 54 is rotatably mounted on the column 51 and rotatably connected to the ring groove 17. A toothed ring 56 is fixed on the rotating ring 54. The toothed ring 56 meshes with the rack A34. An arc tooth groove 561 is formed on the inner edge surface of the toothed ring 56. The arc tooth groove 561 meshes with the gear B53 located below. The snap-fit ​​assembly 55 is mounted on the column 51.

[0054] In an embodiment of the present invention, as shown in FIG13, a circular cavity 511 is provided inside the column 51, and a plurality of radial grooves 512 communicating with the circular cavity 511 are provided on the surface of the column 51 in an annular equally spaced structure.

[0055] In an embodiment of the present invention, as shown in FIG11, the tooth tip surface of gear B53 is slidably engaged with the inner edge surface of gear ring 56. Through the above-described configuration, as shown in FIG11, the tooth tip surface of gear B53 is adapted to the inner edge surface of gear ring 56. When gear B53 disengages from the arc tooth groove 561, the inner edge surface of gear ring 56 rotates and limits the rotation of gear B53, so that when gear ring 56 rotates relative to gear B53, neither gear B53 nor gear A52 rotates.

[0056] In an embodiment of the present invention, as shown in FIG12, the inner surface of the rotating ring 54 has a plurality of snap-fit ​​grooves B541 in an annular and equally spaced structure, and the number of snap-fit ​​grooves B541 is equal to the number of snap-fit ​​grooves A18.

[0057] In an embodiment of the present invention, as shown in FIG13, the snap-fit ​​assembly 55 includes a circular block 551, a plurality of slide bars 552 and a threaded rod 556. The circular block 551 is movably disposed in the circular cavity 511. The plurality of slide bars 552 are respectively slidably disposed on a plurality of radial grooves 512. The plurality of slide bars 552 are all fixedly connected to the circular block 551. The eccentric end of the slide bar 552 is provided with a movable groove 553. A snap-fit ​​block 554 is movably connected to the movable groove 553. Both ends of the snap-fit ​​block 554 are provided with inclined guide surfaces. The snap-fit ​​block 554 and the movable groove 553 are elastically connected by a spring 555. The threaded rod 556 is rotatably disposed in the circular cavity 511 and is threadedly connected to the circular block 551. The end of the threaded rod 556 away from the mounting cavity 16 passes through the circular block 551 and is fixedly provided with a torsion block 557.

[0058] In an embodiment of the present invention, the number of several snap-fit ​​slots B541 is an integer multiple of the number of several snap-fit ​​blocks 554, the snap-fit ​​blocks 554 engage with the snap-fit ​​slots A18, and the snap-fit ​​blocks 554 engage with the snap-fit ​​slots B541. In this invention, the snap-fit ​​assembly 55 is configured such that, in the initial state, the snap-fit ​​block 554 snaps into the snap-fit ​​groove B541. At this time, the toothed ring 56 rotates, which drives the column 51 to rotate through the rotating ring 54. The rotating torsion block 557 and the threaded rod 556 rotate, causing the round block 551 to drive the slide bar 552 to slide relative to the radial slide groove 512. The inclined guide surfaces at both ends of the snap-fit ​​block 554 allow the snap-fit ​​block 554 to slide out of the snap-fit ​​groove B541. The snap-fit ​​block 554 slides into the movable groove 553, which compresses the spring 555 until the snap-fit ​​block 554 slides to the snap-fit ​​groove A18. Under the elastic force of the spring 555, the snap-fit ​​block 554 snaps into the snap-fit ​​groove A18. At this time, the column 51 cannot rotate. Through the structural design of the transmission mechanism 5, during injection, the pressure block 32 drives the two sliding rods 31 to slide relative to the circular groove 11, thereby causing the gear ring 56 to rotate. When the locking block 554 engages with the locking groove A18, the gear ring 56 can rotate relative to the column 51. When the arc tooth groove 561 meshes with the gear B53 located on the lower side, the gear ring 56 drives the gear B53 located on the lower side to rotate in the same direction, while the gear B53 located on the upper side rotates in the opposite direction relative to the gear ring 56. This causes the gear A52 to rotate in the same direction as the gear ring 56. When the arc tooth groove 561 disengages from the gear B53 located on the lower side, the gear A52 located on the upper side rotates in the opposite direction relative to the gear ring 56. B53 is limited by the inner edge of the gear ring 56 and cannot rotate, causing gear A52 to not rotate at this time. Gear B53 then rotates intermittently. When the locking block 554 engages with the locking groove B541, the gear ring 56 and the column 51 rotate as a whole. The relative position of gear B53 and gear ring 56 on the lower side remains unchanged. At this time, whether gear B53 on the lower side is connected to the arc tooth groove 561 or to the inner edge of the gear ring 56, neither gear B53 nor gear A52 can rotate. Gear A52 and gear ring 56 still rotate in the same direction. At this time, gear B53 rotates continuously.

[0059] In an embodiment of the present invention, as shown in Figures 8, 9, and 14, the gear set 6 includes a first gear C61, which is rotatably mounted on the mounting cavity 16. The first gear C61 meshes with the rack B44, and the first gear C61 is connected to the gear A52 via a gear unit, allowing the first gear C61 and gear A52 to rotate in the same direction. Through the structural design of the gear set 6, the present invention enables continuous injection by rotating the first gear C61 continuously when the gear B53 rotates, causing the rack B44 to move continuously. This allows the two piston units 41 to move continuously along the two injection chambers 12, achieving continuous injection, suitable for patients with fragile blood vessels and those requiring short-term catheterization. When the gear B53 rotates intermittently, intermittent pulse injection is achieved. Compared to traditional injection methods, this method uses a pulsed injection achieved by continuously pushing the pressure block 32, making it easier to effectively control the pulse interval and greatly reducing the difficulty of operation.

[0060] In an embodiment of the present invention, the gear unit includes two meshing parrot gears 62. One parrot gear 62 is fixed to the end of the first connecting shaft near the first gear C61, and the other parrot gear 62 is rotatably connected to the mounting cavity 16 via a second connecting shaft. A second gear C63, meshing with the first gear C61, is fixed on the second connecting shaft. Through the structural design of the gear unit, the present invention utilizes the speed variation during the meshing transmission of the two parrot gears 62 to ensure that the rotational speed of the first gear C61 changes regularly, whether rotating continuously or intermittently. This results in a periodic change in the rotational speed of the first gear C61 during continuous injection. This change is transmitted to the rack B44 and the piston unit 41, causing regular fluctuations in the drug delivery speed. Even in continuous injection mode, this creates a gentle pulse effect, enhancing the flushing effect on the inner wall of the catheter. Simultaneously, during pulsed injection… In the intermittent pulse injection mode, the speed change characteristics of the parrot gear 62 are coordinated with the intermittent rotation of gear B53. Gear B53 rotates slowly, then rapidly, and then stops abruptly. The rapid rotation of gear B53 to the sudden stop can create stronger turbulence and enhance the flushing force. As gear B53 rotates slowly to rapid rotation, the pushing speed of piston unit 41 increases synchronously and slowly, and the pressure inside the catheter rises steadily. This allows the vascular endothelium to gradually adapt to the change in flow rate, reducing the risk of vascular irritation. This, combined with the strong flushing formed by the subsequent rapid rotation to the sudden stop, creates a flexible yet rigid combination, achieving effective flushing under safe conditions.

[0061] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. An integrated injection device suitable for sealing dual-lumen PICC catheters, characterized in that, The device includes a double-cavity injection shell (1), a transmission mechanism (5), and a gear set (6). Two injection heads (2) are fixed at the head end of the double-cavity injection shell (1). A moving assembly (3) and a double piston assembly (4) are provided on the double-cavity injection shell (1). A rotating hole (15) is opened on one side of the double-cavity injection shell (1). Several snap-fit ​​grooves A (18) are opened in the middle of the rotating hole (15) in an annular and equally spaced structure. An installation cavity (16) is connected to the rotating hole (15). The transmission mechanism (5) includes a column (51), two meshing gears B (53), a rotating ring (54), and a snap-fit ​​assembly (55). The column (51) is rotatably mounted on the rotating hole (15). A first connecting shaft is rotatably mounted on the column (51). A gear A (52) is fixed on the first connecting shaft. Two gears B (53) are rotatably mounted on the column (51). The gear B (53) on the upper side meshes with the gear A (52). A rotating ring (54) is rotatably mounted on the surface of the column (51). A toothed ring (56) is fixed on the rotating ring (54). The toothed ring (56) meshes with the output end of the moving component (3). An arc tooth groove (561) is opened on the inner edge surface of the toothed ring (56). The arc tooth groove (561) meshes with the gear B (53) on the lower side. A snap-fit ​​component (55) is mounted on the column (51). The rotating hole (15) and the rotating ring (54) are both connected to the snap-fit ​​component (55). The movable end is engaged; the gear set (6) includes a first gear C (61), which meshes with the input end of the double piston assembly (4). The first gear C (61) is connected to the gear A (52) through a gear unit, so that the first gear C (61) and the gear A (52) rotate in the same direction; a circular cavity (511) is provided inside the column (51), and the surface of the column (51) has a ring-shaped, equally spaced structure with a number of radial grooves (512) communicating with the circular cavity (511); the engaging assembly (55) includes a circular block (551), a number of sliding strips (552) and a threaded rod (556). The circular block (551) is movably disposed in the circular cavity (511), and the number of sliding strips (552) are connected to the input end of the double piston assembly (4). The slide bars (552) are slidably disposed on a plurality of radial grooves (512), and the plurality of slide bars (552) are fixedly connected to the circular block (551). The eccentric end of the slide bar (552) is provided with a movable groove (553), and a snap-fit ​​block (554) is movably connected to the movable groove (553). Both ends of the snap-fit ​​block (554) are provided with inclined guide surfaces. The snap-fit ​​block (554) and the movable groove (553) are elastically connected by a spring (555). The threaded rod (556) is rotatably disposed in the circular cavity (511) and threadedly connected to the circular block (551). The end of the threaded rod (556) away from the mounting cavity (16) passes through the circular block (551) and is fixedly provided with a torsion block (557).The number of several snap-fit ​​slots B (541) is an integer multiple of the number of several snap-fit ​​blocks (554). The snap-fit ​​blocks (554) engage with the snap-fit ​​slots A (18), and the snap-fit ​​blocks (554) engage with the snap-fit ​​slots B (541). The gear unit includes two meshing nautilus gears (62). One of the nautilus gears (62) is fixed to one end of the first connecting shaft near the first gear C (61), and the other nautilus gear (62) is rotatably connected to the mounting cavity (16) through a second connecting shaft. A second gear C (63) is fixed on the second connecting shaft and meshes with the first gear C (61).

2. The integrated injection device for sealing dual-lumen PICC catheters according to claim 1, characterized in that, The tooth tip surface of gear B (53) slides with the inner edge surface of gear ring (56).

3. The integrated injection device for sealing dual-lumen PICC catheters according to claim 1, characterized in that, The tail end of the dual-cavity injection shell (1) has two circular grooves (11). The head end of the circular groove (11) has an injection cavity (12). The top end of the circular groove (11) at the bottom end has parallel sliding grooves A (13) and B (14). The first gear C (61) is rotatably mounted on the mounting cavity (16). The sliding grooves A (13) and B (14) are both connected to the mounting cavity (16). The rotating hole (15) has an annular groove (17) on the surface near the mounting cavity (16). The rotating ring (54) is rotatably connected to the annular groove (17). The tail end of the dual-cavity injection shell (1) is fixed with a sleeve (19). The tail end of the sleeve (19) has an installation groove.

4. The integrated injection device for sealing dual-lumen PICC catheters according to claim 3, characterized in that, The two injection heads (2) are respectively connected to the two injection cavities (12). The inner surface of the injection head (2) is provided with a groove, and an elastic ring (21) is fixed on the groove. The inner diameter of the elastic ring (21) gradually increases from the middle to both sides. The inner surface of the elastic ring (21) has a wave structure, and the interior of the elastic ring (21) is hollow to form a deformation gas cavity (22). The inner surface of the injection head (2) away from the mounting cavity (16) is provided with several sets of turbulence balls (23). The several sets of turbulence balls (23) are arranged alternately, and each set of turbulence balls (23) includes multiple balls arranged in a ring with equal spacing.

5. The integrated injection device for sealing dual-lumen PICC catheters according to claim 3, characterized in that, The moving component (3) includes two slide rods (31) and a motor (36). The motor (36) is fixed in the mounting groove. The two slide rods (31) are respectively located on the two circular grooves (11). The two slide rods (31) are fixedly connected by a pressure block (32). The two slide rods (31) are provided with a sliding groove C (33) at opposite ends. A rack A (34) is fixed on the slide rod (31) at the lower end relative to the sliding groove A (13). The toothed ring (56) is meshed with the rack A (34). A lead screw (35) is threaded on the pressure block (32). One end of the lead screw (35) is rotatably connected to the tail end of the double-cavity injection shell (1). The other end of the lead screw (35) passes into the mounting groove and is fixedly connected to the output shaft of the motor (36).

6. The integrated injection device for sealing dual-lumen PICC catheters according to claim 5, characterized in that, The dual piston assembly (4) includes two piston units (41) and two piston rods (42). The two piston units (41) are movably disposed on the two injection chambers (12), and the two piston rods (42) are disposed on the two slide grooves C (33). The piston rods (42) pass through the injection chambers (12) and are fixedly connected to the piston units (41). The two piston rods (42) are fixedly connected by a sliding plate (43). The two ends of the sliding plate (43) are slidably connected to the two slide grooves C (33). A rack B (44) is fixedly disposed on the piston rod (42) at the bottom end relative to the slide groove B (14). The first gear C (61) meshes with the rack B (44).

7. The integrated injection device for sealing dual-lumen PICC catheters according to claim 3, characterized in that, The inner surface of the rotating ring (54) has a ring-shaped, equally spaced structure with a plurality of snap-fit ​​grooves B (541), and the number of the plurality of snap-fit ​​grooves B (541) is equal to the number of the plurality of snap-fit ​​grooves A (18).

Images