Medical device based on linkage of manual injection and automatic suction

Abstract

The medical device comprises a liquid storage tank, an injector assembly and a double-one-way-valve system, the injector assembly comprises an injector body and an elastic body, a piston is located in an injection cylinder, one end of a piston rod is connected with the piston, the other end of the piston rod is connected with an end baffle, and the end baffle is connected with the elastic body. The piston rod is sleeved with the elastic body, and the two ends of the elastic body abut against the syringe and the end baffle respectively. The double-one-way valve system comprises a first one-way valve, a second one-way valve and a three-way pipeline, three ports of the three-way pipeline are connected with a discharge port of the first one-way valve, an inlet port of the second one-way valve and a suction and discharge port of the syringe respectively, and the inlet port of the first one-way valve is communicated with the liquid storage tank through a pipeline; compared with full-manual equipment, the automatic liquid replenishing device can realize automatic liquid replenishing and is more convenient to operate. Compared with full-automatic equipment, flexibility of manual pushing injection is reserved, and meanwhile automatic liquid supplementing can be achieved through a simple mechanical structure.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically a medical device based on the linkage of manual injection and automatic aspiration. Background Technology

[0002] In clinical treatment and nursing care, many procedures rely heavily on specific medical devices for the aspiration and injection of fluids. For example, laryngeal anesthetic sprays and vaginal irrigation involve closely linked aspiration and injection steps in their operational procedures.

[0003] Traditional fully manual devices, such as common syringes, rely on healthcare workers continuously pushing and pulling the plunger. In laryngeal anesthesia spray procedures, after each spray, the doctor must manually and slowly pull back the plunger to draw up new anesthetic solution. This process is not only labor-intensive but also lacks automatic refill functionality after releasing the plunger, resulting in extremely low efficiency. Similarly, in vaginal irrigation, nurses must repeatedly perform manual operations, making it difficult to ensure the efficiency and continuity of the irrigation process. For patients requiring frequent irrigation treatments, this undoubtedly increases the nursing burden.

[0004] In contrast, fully automated equipment, such as common electric suction pumps and the suction device provided by the utility model patent with publication number CN218356821U, while improving suction efficiency to some extent, has many drawbacks. These devices rely on electricity, requiring a stable power supply for operation; otherwise, they will malfunction and lack flexibility and convenience. Furthermore, their complex internal structure, encompassing motors, complex circuit control boards, and numerous other components, significantly increases equipment costs, making them unaffordable for primary healthcare institutions. The complex design also leads to higher failure rates and higher maintenance costs. Crucially, fully automated equipment struggles to meet the demands of scenarios requiring precise small-dose administration, such as laryngeal anesthetic sprays and vaginal irrigation.

[0005] Furthermore, fully automated equipment is generally more suitable for continuous operations. If used in intermittent operations such as laryngeal anesthetic sprays and vaginal irrigation, continuous irrigation or spraying can easily cause excessive pressure and irritation to local tissues. For example, when used in the larynx, it may cause discomfort, coughing, or even damage to the laryngeal mucosa; in vaginal irrigation, excessive irrigation can disrupt the normal pH balance and microecological environment of the vagina, increase the risk of infection, and may also damage the vaginal mucosa.

[0006] Therefore, developing a novel medical device that can link manual injection with automatic aspiration and rehydration is of great practical significance for improving the quality of clinical treatment and nursing care and meeting actual medical needs. Utility Model Content

[0007] The purpose of this invention is to provide a medical device based on the linkage of manual injection and automatic aspiration, which aims to improve the problem that existing fully manual and fully automatic devices cannot simultaneously meet the requirements of accurate manual injection and automatic aspiration for fluid replacement.

[0008] This utility model is implemented as follows:

[0009] This utility model provides a medical device based on the linkage of manual injection and automatic aspiration, including a storage tank, and further comprising:

[0010] A syringe assembly, comprising a syringe body and an elastomer, wherein the syringe body includes a syringe barrel, a piston, a piston rod, and an end baffle, the piston being located in the syringe barrel, one end of the piston rod being connected to the piston and the other end being connected to the end baffle, and the elastomer being sleeved on the piston rod, with both ends of the elastomer abutting against the syringe barrel and the end baffle respectively;

[0011] The dual one-way valve system includes a first one-way valve, a second one-way valve, and a three-way pipeline. The three ports of the three-way pipeline are respectively connected to the outlet of the first one-way valve, the inlet of the second one-way valve, and the suction / discharge port of the syringe. The inlet of the first one-way valve is connected to the storage tank through the pipeline.

[0012] Furthermore, the elastomer uses a spring or an elastic rubber cylinder, and the outlet of the second one-way valve is provided with a fitting connection structure.

[0013] Furthermore, the end baffle includes an adjusting baffle, the piston rod has a threaded rod portion at the end away from the piston, the adjusting baffle has a threaded through hole adapted to the threaded rod portion, the adjusting baffle is installed on the threaded rod portion of the piston rod through its threaded through hole, and the end of the elastomer away from the injection cylinder abuts against the adjusting baffle.

[0014] Furthermore, the end baffle also includes a push plate, the inner side of which is provided with a threaded sleeve, and the push plate is installed at the end of the threaded rod through the threaded sleeve.

[0015] Furthermore, the adjusting baffle is disc-shaped, with a diameter larger than the outer diameter of the elastic body, and an anti-slip structure is provided on the cylindrical wall of the adjusting baffle.

[0016] Furthermore, the storage tank includes a tank body and a tank cover. The upper end of the tank body is provided with a threaded interface, and the tank cover is threadedly installed on the threaded interface at the upper end of the tank body. A suction tube is provided through the tank cover, one end of which is inserted into the tank body, and the other end is connected to the inlet of the first one-way valve.

[0017] Furthermore, a breather is provided on the tank lid, which is used to balance the air pressure inside and outside the storage tank.

[0018] Compared with existing technologies, the advantages of this invention are: Unlike fully manual equipment that requires complete manual control of injection and aspiration, this invention enables automatic fluid replenishment, making operation more convenient. Compared with fully automatic equipment, which is inconvenient to use and difficult to control precisely, this invention retains the flexibility of manual injection while achieving automatic fluid replenishment through a simple mechanical structure. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is the front view of this utility model;

[0021] Figure 3 This is a front view of the syringe assembly of this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the syringe assembly of this utility model when the push plate is removed;

[0023] Figure 5 This is a schematic diagram of the liquid flow direction during flushing or spraying when the push plate is pushed in this utility model.

[0024] Figure 6 This is a schematic diagram of the liquid flow direction during the automatic liquid replenishment state when the push plate of this utility model is pulled.

[0025] In the diagram: 1. Liquid reservoir; 2. Elastomer; 3. Injector; 4. Piston rod; 41. Threaded rod; 5. End baffle; 51. Adjusting baffle; 52. Hand push plate; 6. First check valve; 7. Second check valve; 8. Three-way pipeline; 9. Breather. Detailed Implementation

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0028] Example 1

[0029] This embodiment provides a medical device based on the linkage of manual injection and automatic aspiration, such as... Figures 1-6As shown, the system includes a reservoir 1, a syringe assembly, and a dual one-way valve system. The reservoir 1 is used to store medical fluids, such as anesthetic solutions and irrigation solutions. The reservoir 1 includes a body and a cap. A threaded interface is provided at the upper end of the body, and the cap is threaded onto this interface. The syringe assembly includes a syringe body and an elastic body 2. The elastic body 2 uses a spring or a flexible rubber sleeve. The syringe body includes a syringe barrel 3, a piston, a piston rod 4, and an end baffle 5. The piston is located inside the syringe barrel 3. Multiple volume value markings are pre-set on the outer wall of the syringe barrel 3. When the front end of the piston is at the corresponding volume value marking position, it represents the volume of liquid inside the syringe barrel 3. One end of the piston rod 4 is connected to the piston, and the other end is connected to the end baffle 5. The elastic body 2 is sleeved on the piston rod 4, and its two ends abut against the syringe barrel 3 and the end baffle 5, respectively.

[0030] like Figures 1-4 As shown, the end baffle 5 includes an adjusting baffle 51 and a push plate 52. The piston rod 4 has a threaded rod portion 41 at the end furthest from the piston. The adjusting baffle 51 has a threaded through hole that matches the threaded rod portion 41. The adjusting baffle 51 is mounted on the threaded rod portion 41 of the piston rod 4 through its threaded through hole. The adjusting baffle 51 is disc-shaped, with a diameter larger than the outer diameter of the elastomer 2. The end of the elastomer 2 furthest from the syringe 3 abuts against the adjusting baffle 51. Rotating the adjusting baffle 51 adjusts the preload of the elastomer 2 to accommodate medical liquids of different viscosities. The preload of the elastomer 2 can also be adjusted to control the volume of liquid extracted within a certain range. The cylindrical wall of the adjusting baffle 51 has an anti-slip structure to facilitate the adjustment of the preload of the elastomer 2 by rotating the adjusting baffle 51. The inner side of the push plate 52 is provided with a threaded sleeve. The push plate 52 is installed at the end of the threaded rod 41 through the threaded sleeve. The push plate 52 makes it easy for the operator to operate the syringe assembly for manual injection.

[0031] like Figure 1 and Figure 2As shown, the dual one-way valve system includes a first one-way valve 6, a second one-way valve 7, and a three-way conduit 8. The three-way conduit 8 is a three-way connector, and its three ports are respectively connected to the outlet of the first one-way valve 6, the inlet of the second one-way valve 7, and the suction / discharge port of the syringe 3. The permissible flow direction of both the first one-way valve 6 and the second one-way valve 7 is from their inlets to their outlets. A suction tube is installed through the lid of the liquid storage tank 1. One end of the suction tube is inserted into the tank body, and the other end is connected to the inlet of the first one-way valve 6, thus connecting the inlet of the first one-way valve 6 to the interior of the liquid storage tank 1. The outlet of the second one-way valve 7 is provided with a fitting connection structure. The fitting connection structure can be the outlet structure of the second one-way valve 7 itself, which can be directly used to insert atomizing nozzles, multi-hole irrigation tubing, or anti-splash biopsy nozzles, etc., suitable for different treatment purposes, as liquid outlet components. The accessory connection structure can also be a mounting interface structure that is installed at the outlet of the second check valve 7, has a plug-in interface, and the plug-in interface is connected to the outlet of the second check valve 7.

[0032] like Figure 1 or Figure 2 As shown, a respirator 9 is installed on the lid of the liquid storage tank 1. The respirator 9 is used to balance the air pressure inside and outside the liquid storage tank 1. When the medical liquid in the liquid storage tank 1 is aspirated, the air pressure inside the tank will change. The respirator 9 allows an appropriate amount of outside air to enter the tank to maintain a stable air pressure inside the tank.

[0033] Example 2

[0034] This embodiment provides a medical manual injection and automatic aspiration linkage method, using the medical device based on manual injection and automatic aspiration linkage provided in Embodiment 1, including:

[0035] Preparation phase: Add the required medical fluid to the reservoir 1 according to the treatment or nursing needs; adjust the elastomer 2 to the appropriate preload according to the viscosity of the medical fluid; connect the appropriate liquid outlet component to the outlet of the second check valve 7 according to the specific application.

[0036] Manual injection stage: The operator applies pressure to drive the piston rod 4 and the end baffle 5, compressing the elastomer 2. The first one-way valve 6 closes and the second one-way valve 7 opens. The liquid in the syringe 3 is discharged through the outlet of the second one-way valve 7, and then discharged through the liquid outlet component installed at the outlet of the second one-way valve 7, spraying medical liquid onto the patient's treatment site or nursing area.

[0037] Automatic liquid replenishment stage: The operator releases the piston rod 4 and the end baffle 5. The elastic body 2 rebounds and drives the piston and piston rod 4 to reset. The second one-way valve 7 closes and the first one-way valve 6 opens. The liquid in the storage tank 1 enters the syringe 3 through the first one-way valve 6, realizing automatic liquid replenishment.

[0038] During the manual injection phase, the operating pressure is controlled at 0.5-5N. During the automatic replenishment phase, the rebound speed of the elastomer 2 is controlled at 10-50mm / s. This can be achieved by properly selecting the syringe, the elastomer 2, and properly adjusting the preload of the elastomer 2.

[0039] Example 3

[0040] This embodiment provides a method for administering laryngeal anesthesia spray, using the medical device based on manual injection and automatic aspiration linkage provided in Embodiment 1, including the following steps:

[0041] Preparation stage: Add anesthetic solution to storage tank 1, adjust elastomer 2 to a suitable pre-tightening force, and connect atomizing nozzle to the outlet of second one-way valve 7.

[0042] Manual injection stage: The nebulizer nozzle is aimed at the patient's larynx, and the operator applies a pressure of about 2N to drive the piston rod 4 and the end baffle 5, compressing the elastomer 2. The first one-way valve 6 is closed, and the second one-way valve 7 is opened. The liquid in the syringe 3 is discharged through the outlet of the second one-way valve 7 and then sprayed into the patient's larynx by the nebulizer nozzle to perform laryngeal anesthesia.

[0043] Automatic fluid replenishment stage: The operator releases the piston rod 4 and end baffle 5. The elastic body 2 rebounds, driving the piston and piston rod 4 to reset. The rebound speed is 30mm / s. The second one-way valve 7 closes, and the first one-way valve 6 opens. The anesthetic solution in the reservoir 1 enters the syringe 3 through the first one-way valve 6, realizing automatic replenishment of the anesthetic solution. The automatic replenishment of anesthetic solution can adjust the volume of fluid drawn according to the pre-tightening force of the elastic body 2. The cycle time is <3 seconds.

[0044] Example 4

[0045] This embodiment provides a vaginal irrigation method using the medical device based on manual injection and automatic aspiration linkage provided in Embodiment 1, including the following steps:

[0046] Preparation stage: Add vaginal douche fluid to reservoir 1, adjust elastomer 2 to a suitable pre-tightening force, and connect a multi-hole douche catheter to the outlet of the second one-way valve 7.

[0047] Manual injection stage: Insert the multi-hole irrigation catheter into the patient's vagina. The operator applies a pressure of about 5N to drive the piston rod 4 and the end baffle 5, compressing the elastomer 2. The first one-way valve 6 closes and the second one-way valve 7 opens. The liquid in the syringe 3 is discharged through the outlet of the second one-way valve 7, and then the irrigation fluid is sprayed into the patient's vagina through the multi-hole irrigation catheter to perform vaginal irrigation.

[0048] Automatic fluid replenishment stage: The operator releases the piston rod 4 and end baffle 5. The elastic body 2 rebounds, driving the piston and piston rod 4 to reset. The rebound speed is 50mm / s. The second one-way valve 7 closes, and the first one-way valve 6 opens. The vaginal irrigation fluid in the reservoir 1 enters the syringe 3 through the first one-way valve 6, realizing the automatic replenishment of vaginal irrigation fluid. The cycle time is less than 1 second.

[0049] In summary, compared to fully manual equipment that requires complete manual control of injection and aspiration, this invention enables automatic fluid replenishment, reducing operational steps by more than 50%. Compared to fully automatic equipment, which is inconvenient to use and difficult to control precisely, this invention retains the flexibility of manual injection while achieving automatic fluid replenishment through a simple mechanical structure.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A medical device based on the linkage of manual injection and automatic aspiration, comprising a storage tank (1), characterized in that, Also includes: The syringe assembly includes a syringe body and an elastomer (2). The syringe body includes a syringe barrel (3), a piston, a piston rod (4), and an end baffle (5). The piston is located in the syringe barrel (3). One end of the piston rod (4) is connected to the piston, and the other end is connected to the end baffle (5). The elastomer (2) is sleeved on the piston rod (4). The two ends of the elastomer (2) abut against the syringe barrel (3) and the end baffle (5) respectively. The dual one-way valve system includes a first one-way valve (6), a second one-way valve (7), and a three-way pipeline (8). The three ports of the three-way pipeline (8) are respectively connected to the outlet of the first one-way valve (6), the inlet of the second one-way valve (7), and the suction and discharge ports of the syringe (3). The inlet of the first one-way valve (6) is connected to the liquid storage tank (1) through the pipeline.

2. The medical device based on manual injection and automatic aspiration linkage according to claim 1, characterized in that, The elastomer (2) uses a spring or an elastic rubber cylinder, and the outlet of the second one-way valve (7) is provided with a fitting connection structure.

3. The medical device based on manual injection and automatic aspiration linkage according to claim 1, characterized in that, The end baffle (5) includes an adjusting baffle (51). The piston rod (4) has a threaded rod portion (41) at one end away from the piston. The adjusting baffle (51) has a threaded through hole that matches the threaded rod portion (41). The adjusting baffle (51) is installed on the threaded rod portion (41) of the piston rod (4) through its threaded through hole. The end of the elastomer (2) away from the injection cylinder (3) abuts against the adjusting baffle (51).

4. A medical device based on manual injection and automatic aspiration linkage according to claim 3, characterized in that, The end baffle (5) also includes a push plate (52), the inner side of which is provided with a threaded sleeve, and the push plate (52) is installed at the end of the threaded rod (41) through the threaded sleeve.

5. A medical device based on manual injection and automatic aspiration linkage according to claim 3, characterized in that, The adjusting baffle (51) is disc-shaped, and its diameter is larger than the outer diameter of the elastic body (2). The cylindrical wall of the adjusting baffle (51) is provided with an anti-slip structure.

6. A medical device based on manual injection and automatic aspiration linkage according to claim 1, characterized in that, The storage tank (1) includes a tank body and a tank cover. The upper end of the tank body is provided with a threaded interface, and the tank cover is threadedly installed on the threaded interface at the upper end of the tank body. A suction tube is provided through the tank cover. One end of the suction tube is inserted into the tank body, and the other end is connected to the inlet of the first one-way valve (6).

7. A medical device based on manual injection and automatic aspiration linkage according to claim 6, characterized in that, A breather (9) is provided on the tank cover, which is used to balance the air pressure inside and outside the storage tank (1).

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