A saline infusion device suitable for PICCO

Abstract

This invention provides an infusion device for PICCO-compatible saline solution, comprising a syringe, a sealing assembly, and a transmission mechanism. The syringe head has an inlet tube and an outlet tube communicating internally. The syringe head also has a groove connecting the inlet and outlet tubes. The sealing assembly is slidably connected within the groove and can seal either the inlet or outlet tube. The transmission assembly is rotatably mounted on the syringe head and connected to the syringe plunger. Pulling the plunger outward causes the sealing assembly to slide intermittently via the transmission assembly, moving it from sealing the outlet tube to sealing the inlet tube when pushed to its maximum distance; pushing inward reverses this process. This infusion device for PICCO-compatible saline solution allows for changing the sealing status of the inlet and outlet tubes through outward and inward pulling, respectively, eliminating the need to repeatedly move the syringe interface. The inlet tube is connected to a cold water bag, and the outlet tube is connected to a three-way connector.

Description

Technical Field

[0001] This invention relates to the field of PICCO technology, and more specifically to a saline infusion device suitable for PICCO. Background Technology

[0002] Pulse indicator continuous cardiac output (PiCCO) monitoring, characterized by its minimally invasive nature, accuracy, and continuous monitoring, is widely used for hemodynamic monitoring in critically ill patients. The thermodilution method of PiCCO requires the timely (every 4 or 6 hours) or on-demand infusion of a fixed amount (20 ml for adults, reduced amount for children) of chilled saline (≤15°C), delivered from a central venous catheter via the superior vena cava to the right atrium. Therefore, current techniques for monitoring PiCCO parameters using the thermodilution method typically require healthcare professionals to perform the following steps: 1. First, the healthcare professional needs to place the pre-packaged 100 ml of saline solution in a refrigerator to cool it below 15°C; 2. Then, the chilled saline solution (i.e., below 15°C) is infused... When preparing the saline solution, medical staff need to remove it from the refrigerator and disinfect the packaging opening; 3. Then, use a disposable 20ml syringe to draw 20ml of low-temperature saline solution; 4. Unscrew the stopcock connecting the PiCCO device to the central venous catheter, and quickly (usually within 5 seconds) inject a measured amount of low-temperature saline solution into the central venous catheter using the reserved injection port (usually one port of a three-way valve); 5. Repeat steps 3 and 4 above three times (i.e., intermittently inject a measured amount of low-temperature saline solution); 6. Disinfect the injection port of the PiCCO device and tighten the stopcock; 7. Discard the used syringe and the remaining saline solution.

[0003] This process requires repeatedly switching the syringe between the cold water bag and the three-way valve, which is quite troublesome. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a saline infusion device suitable for PICCO, thereby solving the technical problem mentioned in the background art that requires repeated switching and docking of syringes between the cold water bag and the three-way valve.

[0005] To solve this technical problem, the technical solution adopted by the present invention is as follows:

[0006] A saline infusion device suitable for PICCO includes a syringe, a sealing assembly, and a transmission mechanism;

[0007] The syringe head is provided with an inlet tube and an outlet tube that communicate with the inside. The syringe head is also provided with a groove that connects the inlet tube and the outlet tube. The sealing assembly is slidably connected in the groove and can seal the inlet tube or the outlet tube.

[0008] The transmission mechanism is rotatably mounted on the head of the syringe and connected to the syringe plunger; pulling the plunger outward can cause the sealing assembly to slide intermittently through the transmission mechanism, and when pushed to the maximum distance, it moves from sealing the outlet tube to sealing the inlet tube; pushing the plunger inward can cause the sealing assembly to slide intermittently through the transmission mechanism, and move from sealing the inlet tube to sealing the outlet tube.

[0009] Furthermore, the sealing assembly includes a sealing plate, a connecting rod, and a rack. The sealing plate is slidably connected to the groove, and the top of the groove is provided with an elongated hole. The connecting rod passes through the elongated hole, with one end connected to the sealing plate and the other end connected to the rack. The rack is slidably connected to the syringe head, and the transmission mechanism can drive the rack to slide intermittently.

[0010] Furthermore, the transmission mechanism includes a rotating component, a transmission component, a torsion spring, and a connecting rope; the rotating component and the transmission component are rotatably connected to the syringe head, the rotating component can drive the rack to slide, and the transmission component can intermittently drive the rotating component to rotate; one end of the torsion spring is connected to the syringe, and the other end is connected to the transmission component; one end of the connecting rope is wound around the transmission component, and the other end is connected to the push rod.

[0011] Furthermore, the rotating assembly includes a driven shaft, a gear, and a grooved wheel; the driven shaft is rotatably connected to the syringe head, the gear and the grooved wheel are coaxially fixed on the driven shaft, the gear meshes with the rack, and the transmission assembly can drive the grooved wheel to rotate intermittently.

[0012] Furthermore, the transmission assembly includes a drive shaft, a turntable, an arc-shaped protrusion, and a drive column; the drive shaft is rotatably connected to the head of the syringe, the turntable is coaxially fixed on the drive shaft, the arc-shaped protrusion is coaxially fixed on the turntable, and the drive column is eccentrically erected on the turntable; the drive column can intermittently drive the grooved wheel to rotate, and the arc-shaped protrusion can be inserted into the grooved wheel during the rotation gap; the torsion spring is connected to the turntable, and the connecting rope is wound around the drive shaft.

[0013] Furthermore, a partition plate is provided, which is fixed on the drive shaft and lower than the turntable; one end of the torsion spring is provided on the syringe and the other end is provided on the bottom surface of the partition plate; the connecting rope is wound around the drive shaft at the top of the partition plate.

[0014] Furthermore, a pushing mechanism is provided, which is connected to the push rod and can push and pull the push rod.

[0015] Furthermore, the pushing mechanism includes a base, a connecting block, a servo motor, a lead screw, a slider, and a connecting plate; the base is connected to the syringe through the connecting block, the servo motor is located inside the base, one end of the lead screw is connected to the output shaft of the motor, and the other end is rotatably connected to the base, the slider is sleeved on the lead screw, and is connected to the push rod through the connecting plate.

[0016] The advancements of this application compared to existing technologies are as follows:

[0017] The sliding of the push rod drives the rotation of the transmission mechanism, which in turn causes the sealing assembly to slide intermittently, thus keeping one side open and the other side closed. Due to the intermittent movement, there is enough time for liquid to enter or exit. When the push rod slides to the end of its stroke, the end closes and the other end opens, thus enabling repeated liquid intake and discharge.

[0018] Specifically, the inlet tube is connected to the water bag, and the outlet tube is connected to a valve such as a three-way valve or a four-way valve. Initially, the outlet tube is connected to the outside via the three-way valve. The sealing assembly abuts against the end of the side groove of the outlet tube, closing the outlet. The inlet tube is opened, and the push rod is pulled outward. The sealing assembly intermittently slides towards the groove at the end of the inlet tube, opening the outlet tube while closing the inlet tube. At this point, since the push rod has not yet reached the end of its stroke, it will continue to slide, causing the sealing assembly to slide to the end of the groove. The syringe's outlet tube then draws liquid through the three-way valve. Introduce some air; push the plunger inward, and the sealing assembly intermittently slides towards the groove at the end of the inlet tube. The air drawn into the syringe is expelled through the three-way valve. Once the air is expelled, rotate the three-way valve to allow the injection fluid in the syringe to enter the patient's body through the three-way valve. At the same time as the sealing assembly closes the outlet tube, the inlet tube is opened. At this point, since the plunger has not yet reached the syringe head, it will continue to slide, allowing excess injection fluid inside the syringe to be discharged into the cold water bag through the inlet tube until the sealing assembly moves to the end, i.e., the plunger slides to the head. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1This is a schematic diagram of a saline infusion device suitable for PICCO according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The diagram shows the assembly of the syringe, sealing assembly, and transmission mechanism.

[0022] Figure 3 for Figure 2 An enlarged schematic diagram of part A shown;

[0023] Figure 4 for Figure 2 A partial cross-sectional schematic diagram of the syringe, sealing assembly, and transmission mechanism shown;

[0024] Figure 5 for Figure 1 A schematic diagram of the actuation mechanism is shown.

[0025] Figure label:

[0026] Syringe 1, plunger 11, inlet tube 12, outlet tube 13, chute 14, sealing assembly 2, sealing plate 21, connecting rod 22, rack 23, transmission mechanism 3, rotating assembly 31, driven shaft 311, gear 312, grooved wheel 313, transmission assembly 32, drive shaft 321, turntable 322, arc-shaped protrusion 323, drive column 324, torsion spring 33, connecting rope 34, partition plate 35, pushing mechanism 4, base 41, connecting block 42, servo motor 43, lead screw 44, slider 45, connecting plate 46. Detailed Implementation

[0027] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0028] Please refer to the following: Figures 1-5 This embodiment provides a saline infusion device suitable for PICCO, including a syringe 1, a sealing assembly 2, and a transmission mechanism 3;

[0029] The syringe 1 has an inlet tube 12 and an outlet tube 13 that communicate with the inside. It should be understood that the top of the syringe 1 is the end away from the tail of the plunger 11, which is the end where the needle can be inserted. The syringe 1 also has a groove 14 that connects the inlet tube 12 and the outlet tube 13. The sealing assembly 2 is slidably connected in the groove 14 and can seal the inlet tube 12 or the outlet tube 13.

[0030] The transmission mechanism 3 is rotatably mounted on the head of the syringe 1 and connected to the plunger 11 of the syringe 1; the outward-pulling plunger 11 can cause the sealing assembly 2 to slide intermittently through the transmission mechanism 3, and when pushed to the maximum distance, it moves from the closed outlet tube 13 to the closed inlet tube 12; the inward-pushing plunger can cause the sealing assembly to slide intermittently through the transmission mechanism, and move from the closed inlet tube to the closed outlet tube.

[0031] Specifically, the chute 14 passes through both sides of the inlet pipe 12 and the outlet pipe 13. The sealing assembly 2 abuts against one end of the chute 14. When the push rod 11 slides to its outermost or innermost position, it drives the sealing assembly 2 to slide from one side of the chute 14 to the other. Due to the intermittent sliding of the sealing assembly 2, liquid inlet or outlet operations will occur before the sealing assembly 2 seals the inlet or outlet. After the sealing assembly seals the inlet pipe 12 or the outlet pipe 13, the push rod 11 will continue to slide before reaching the end of its stroke, causing the sealing assembly 2 to continue sliding towards the end of the chute 14. When the push rod 11 reaches the end of its stroke, the sealing assembly 2 also reaches the end of the chute 14. It should be understood that the inlet pipe 12 and the outlet pipe 13 have the same diameter. The sealing assembly 2 moves in single increments based on the diameter of the inlet pipe 12 or the outlet pipe 13, and the air content in the syringe 1 does not exceed 2 ml.

[0032] The sliding of push rod 11 drives the rotation of transmission mechanism 3, and the rotation of transmission mechanism 3 drives the intermittent sliding of sealing assembly 2, thereby keeping one side connected and the other side closed. Due to the intermittent movement, there is enough time for liquid inlet or outlet. When push rod 11 slides to the end of its stroke, this end closes and the other end opens, so that liquid suction and outlet can be performed repeatedly.

[0033] Specifically, the inlet pipe 12 is connected to the water bag, and the outlet pipe 13 is connected to a valve such as a three-way valve or a four-way valve. In the initial state, the outlet pipe 13 is connected to the outside through the three-way valve. The sealing assembly 2 abuts against the end of the side groove 14 of the outlet pipe 13 to close the outlet. The inlet pipe 12 is opened, the push rod 11 is pulled outward, and the sealing assembly 2 intermittently slides towards the groove 14 at the end of the inlet pipe 12. At the same time as closing the inlet pipe 12, the outlet pipe 13 is opened. At this time, since the push rod 11 has not yet reached the end, it will continue to slide, so that the sealing assembly 2 slides to the end of the groove 14, and the outlet pipe 13 of the syringe 1... Some air is drawn in through the three-way valve; the push rod 11 is pushed inward, and the sealing assembly 2 slides intermittently toward the groove at the end of the inlet tube 12. The air drawn into the syringe 1 is discharged through the three-way valve. When the air is exhausted, the three-way valve is rotated so that the injection fluid in the syringe 1 can enter the patient's body through the three-way valve. At the same time as the sealing assembly 2 closes the outlet tube 13, the inlet tube 12 is opened. At this time, since the push rod 11 has not yet reached the head of the syringe 1, it will continue to slide, so that the excess injection fluid inside the syringe 1 is discharged into the cold water bag through the inlet tube 12 until the sealing assembly 2 moves to the end, that is, the push rod 11 slides to the head.

[0034] In other embodiments, the sealing assembly 2 includes a sealing plate 21, a connecting rod 22, and a rack 23. The sealing plate 21 is slidably connected within a groove 14, and the top of the groove 14 is provided with an elongated hole. The connecting rod 22 passes through the elongated hole, with one end connected to the sealing plate 21 and the other end connected to the rack 23. The rack 23 is slidably connected to the head of the syringe 1, and the transmission mechanism 3 can drive the rack 23 to slide intermittently. It should be understood that the sealing plate 21 can be in contact with the inner wall of the groove 14, and its spontaneous movement can be prevented by friction with the groove 14.

[0035] In other embodiments, the transmission mechanism 3 includes a rotating assembly 31, a transmission assembly 32, a torsion spring 33, and a connecting rope 34. The rotating assembly 31 and the transmission assembly 32 are rotatably connected to the head of the syringe 1. The rotating assembly 31 can drive the rack 23 to slide, and the transmission assembly 32 can intermittently drive the rotating assembly 31 to rotate. One end of the torsion spring 33 is connected to the syringe 1, and the other end is connected to the transmission assembly 32. One end of the connecting rope 34 is wound around the transmission assembly 32, and the other end is connected to the push rod 11. During liquid injection, pulling the push rod 11 gradually unwinds the connecting rope 34 and drives the transmission assembly 32 to rotate, while simultaneously deforming the torsion spring 33. During liquid discharge, the push rod 11 is pushed inward, and the deformed torsion spring 33 recovers its deformation, causing the transmission assembly 32 to reverse, so that the connecting rope 34 is rewound around the rotating assembly 31. To prevent the push rod 11 from falling back due to the action of the torsion spring 33 when it is pulled, the push rod 11 should be held firmly.

[0036] In other embodiments, the rotating assembly 31 includes a driven shaft 311, a gear 312, and a grooved wheel 313; the driven shaft 311 is rotatably connected to the head of the syringe 1, the gear 312 and the grooved wheel 313 are coaxially fixed on the driven shaft 311, the gear 312 meshes with the rack 23, and the transmission assembly 32 can drive the grooved wheel 313 to rotate intermittently.

[0037] In other embodiments, the transmission assembly 32 includes a drive shaft 321, a turntable 322, an arc-shaped protrusion 323, and a drive column 324. The drive shaft 321 is rotatably connected to the head of the syringe 1. The turntable 322 is coaxially fixed on the drive shaft 321. The arc-shaped protrusion 323 is coaxially fixed on the turntable 322. The drive column 324 is eccentrically mounted on the turntable 322. The drive column 324 can intermittently drive the grooved wheel 313 to rotate. The arc-shaped protrusion 323 can be inserted into the grooved wheel 313 during the rotation gap. The torsion spring 33 is connected to the turntable 322, and the connecting rope is wound around the drive shaft 321.

[0038] In other designs, a partition plate 35 is provided, which is fixed to the drive shaft 321 and lower than the turntable 322. One end of the torsion spring 33 is located on the syringe 1, and the other end is located on the bottom surface of the partition plate 35. The connecting rope 34 is wound around the drive shaft 321 at the top of the partition plate 35. By separating the connecting rope 34 and the torsion spring 33 through the partition plate 35, the rope can be prevented from getting tangled on the torsion spring 33.

[0039] In other solutions, a pushing mechanism 4 is also provided, which is connected to the push rod 11 and can push and pull the push rod 11. By using the push rod 11 mechanism, it is easier to push the push rod 11 and reduce manpower.

[0040] In other embodiments, the actuating mechanism 4 includes a base 41, a connecting block 42, a servo motor 43, a lead screw 44, a slider 45, and a connecting plate 46. The base 41 is connected to the syringe 1 via the connecting block 42. The servo motor 43 is housed within the base 41. One end of the lead screw 44 is connected to the output shaft of the motor, and the other end is rotatably connected to the base 41. The slider 45 is fitted onto the lead screw 44 and is connected to the push rod 11 via the connecting plate 46. The servo motor 43 can change the pushing and pulling speed of the push rod 11 as needed. It should also be understood that the servo motor 43 can hold its output shaft closed when it stops working.

[0041] The aforementioned saline infusion device for PICCO allows for adjustment of the inlet and outlet tubing's closure status by pulling outwards and pushing inwards, respectively, eliminating the need to repeatedly move the syringe's interface. It should be understood that the inlet tubing is connected to the cold water bag, and the outlet tubing is connected to the T-connector.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A saline infusion device suitable for PICCO, characterized in that, Includes syringe, sealing assembly, and transmission mechanism; The syringe head is provided with an inlet tube and an outlet tube that communicate with the inside. The syringe head is also provided with a groove that connects the inlet tube and the outlet tube. The sealing assembly is slidably connected in the groove and can seal the inlet tube or the outlet tube. The transmission mechanism is rotatably mounted on the head of the syringe and connected to the plunger of the syringe; pulling the plunger outward can cause the sealing assembly to slide intermittently through the transmission mechanism, and move from closing the outlet tube to closing the inlet tube; pushing the plunger inward can cause the sealing assembly to slide intermittently through the transmission mechanism, and move from closing the inlet tube to closing the outlet tube. The sealing assembly includes a sealing plate, a connecting rod, and a rack. The sealing plate is slidably connected to the groove. The top of the groove is also provided with an elongated hole. The connecting rod passes through the elongated hole. One end of the connecting rod is connected to the sealing plate, and the other end is connected to the rack. The rack is slidably connected to the syringe head. The transmission mechanism can drive the rack to slide intermittently. The transmission mechanism includes a rotating component, a transmission component, a torsion spring, and a connecting rope; the rotating component and the transmission component are rotatably connected to the syringe head, the rotating component can drive the rack to slide, and the transmission component can intermittently drive the rotating component to rotate; one end of the torsion spring is connected to the syringe, and the other end is connected to the transmission component; one end of the connecting rope is wound around the transmission component, and the other end is connected to the push rod.

2. The saline infusion device suitable for PICCO according to claim 1, characterized in that, The rotating assembly includes a driven shaft, a gear, and a grooved wheel; the driven shaft is rotatably connected to the syringe head, the gear and the grooved wheel are coaxially fixed on the driven shaft, the gear meshes with the rack, and the transmission assembly can drive the grooved wheel to rotate intermittently.

3. A saline infusion device suitable for PICCO according to claim 2, characterized in that, The transmission assembly includes a drive shaft, a turntable, an arc-shaped protrusion, and a drive column; the drive shaft is rotatably connected to the head of the syringe, the turntable is coaxially fixed on the drive shaft, the arc-shaped protrusion is coaxially fixed on the turntable, and the drive column is eccentrically erected on the turntable; the drive column can intermittently drive the grooved wheel to rotate, and the arc-shaped protrusion can be inserted into the grooved wheel during the rotation gap of the grooved wheel; The torsion spring is connected to the turntable, and the connecting rope is wound around the drive shaft.

4. A saline infusion device suitable for PICCO according to claim 3, characterized in that, It also includes a partition plate, which is fixed on the drive shaft and is lower than the turntable; one end of the torsion spring is located on the syringe and the other end is located on the bottom surface of the partition plate; the connecting rope is wound around the drive shaft at the top of the partition plate.

5. A saline infusion device suitable for PICCO according to claim 4, characterized in that, It also includes a pushing mechanism, which is connected to the push rod and can push and pull the push rod.

6. A saline infusion device suitable for PICCO according to claim 5, characterized in that, The pushing mechanism includes a base, a connecting block, a servo motor, a lead screw, a slider, and a connecting plate. The base is connected to the syringe through the connecting block. The servo motor is located inside the base. One end of the lead screw is connected to the output shaft of the motor, and the other end is rotatably connected to the base. The slider is sleeved on the lead screw and is connected to the push rod through the connecting plate.

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