Disposable anesthesia precision liquid medicine filter

Abstract

The invention discloses a disposable anesthesia precise liquid medicine filter which comprises a shell cylinder, a filter cavity is formed in a cylinder cavity of the shell cylinder, the upper end and the lower end of the filter cavity are connected with a liquid inlet nozzle and a liquid outlet nozzle respectively, and a first stop ring is fixed to the cavity wall of the filter cavity; the elastic lifting mechanism is arranged at the upper end of the shell cylinder, and a first filter membrane is mounted at the lower end of the elastic lifting mechanism and slides on the cavity wall of the filter cavity above the first stop ring; and the second filtering mechanism is arranged in the filtering cavity below the first stop ring.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a disposable precision anesthetic drug filter. Background Technology

[0002] In clinical anesthesia and analgesia, intravenous infusion is the primary route of drug administration. During the preparation, extraction, tubing connection, and infusion of the drug solution, various physical particulate contaminants (such as glass fragments, rubber particles, fibers, and drug crystals) and biological contaminants (such as bacteria and fungi) can easily be introduced. Once these contaminants enter the patient's bloodstream, they can cause serious complications such as phlebitis, microvascular embolism, granuloma formation, and even systemic infection, posing a significant threat to patient safety.

[0003] Existing disposable anesthetic filters mainly employ a fixed filter membrane structure, relying on external infusion pressure to passively pass the medication through the filter membrane to achieve mechanical filtration and sterilization. However, this conventional design has the following significant drawbacks: (1) The filtration speed depends entirely on the external infusion pressure. For viscous drugs or micro-infusions, the filtration efficiency is low, and the filter membrane surface is easily blocked in advance due to particle accumulation. (2) When the front end filter membrane is punctured by sharp particles, the filter fails, and the operator has difficulty in making a judgment, resulting in a delayed response and high risk; (3) A certain amount of drug solution often remains in the filter membrane and its upstream chamber after the infusion is completed, which will cause drug waste and economic loss.

[0004] Therefore, it is necessary to provide a disposable precision anesthetic drug filter to solve the problems mentioned in the background art above. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a disposable precision anesthetic drug filter, comprising: The shell has a filter chamber inside its cavity. The upper and lower ends of the filter chamber are respectively connected to the inlet and outlet nozzles. A stop ring is fixed to the wall of the filter chamber. An elastic lifting mechanism is located at the upper end of the shell, and a first filter membrane is installed at its lower end. The first filter membrane slides on the filter cavity wall above the stop ring. The second filtration mechanism is located in the filter chamber below the stop ring.

[0006] As a preferred embodiment of the present invention, the elastic lifting mechanism includes a column hole at the upper end of the shell, a top cover at the upper end of the column hole, and a plunger rod for connecting the first filter membrane slidingly at the lower part of the plunger rod. The plunger rod and the top cover are connected by a spring.

[0007] As a preferred embodiment of the present invention, the second filtration mechanism includes: The second filter membrane is fixed at the lower end of the stop ring, and a third filter membrane that slides against the wall of the filter cavity is provided below it. Piston hole two is located in piston rod one, and piston rod two for connecting the third filter membrane slides on its lower part. Piston rod two penetrates the second filter membrane, and piston rod two is connected to the upper end of piston hole two by spring two.

[0008] As a preferred embodiment of the present invention, the second filter membrane includes a filter frame two and filter sheets two uniformly distributed on the filter frame two, and the third filter membrane includes a filter frame three and filter sheets three uniformly distributed on the filter frame three, with filter sheets two and filter sheets three being staggered.

[0009] As a preferred embodiment of the present invention, a warning rod is fixed to the upper end of the second plunger rod, and the warning rod passes through the first plunger rod and the top cover in sequence.

[0010] As a preferred embodiment of the present invention, a second stop ring is provided on the filter cavity wall below the third filter membrane. The outer surfaces of the first, second, and third filter membranes are all in close frictional contact with the inner wall of the filter cavity, and the maximum downward movement distance of the first filter membrane is set to... When the first filter membrane moves downward and until At that time, it can drive the third filter membrane to move downwards.

[0011] As a preferred embodiment of the present invention, the first filter membrane includes a filter frame and filter sheets distributed on the filter frame, and the outlet port of the liquid inlet is corresponding to the filter sheet.

[0012] As a preferred embodiment of the present invention, an elastic cotton sheet is connected to the lower end of the filter sheet, and the lower end of the side of the elastic cotton sheet is connected to the filter frame.

[0013] As a preferred embodiment of the present invention, the inner diameter of the inlet nozzle is consistent with the outer diameter of the outlet nozzle.

[0014] Compared with the prior art, the present invention provides a disposable precision anesthetic drug filter, which has the following beneficial effects: This invention utilizes a pressure filtration space design to convert the pressure of the injected drug solution into a mechanical force that drives the first filter membrane downwards, thereby actively squeezing the drug solution through the filter membrane. Compared to traditional passive osmosis, this active pressure filtration mode significantly increases the filtration flux per unit time, especially beneficial for the rapid filtration of viscous drug solutions. It also reduces the accumulation of particulate matter on the membrane surface, extending the effective filtration time. When the first filter membrane is damaged, the pressure in the pressure filtration space drops sharply, and a spring quickly pulls it back, simultaneously causing the third filter membrane to move upwards and fit tightly against the second filter membrane. The staggered filter design physically cuts off the downstream flow path. This process is automatically triggered and reacts rapidly, fundamentally preventing contaminants from continuing to flow and filter. At the same time, the sudden change in tactile resistance caused by pressure relief and the visual signal of the warning lever popping out provide the operator with an immediate and clear dual alarm, greatly improving the timeliness and accuracy of risk identification.

[0015] This invention utilizes the tight fit between the first filter membrane and the top surface of the filter chamber during resetting, scraping and squeezing all residual medication through the membrane like a scraper, achieving near 100% medication delivery. This reduces waste of expensive anesthetic drugs and ensures accurate dosage. Through the coordinated and differential design of springs one and two, multiple functions such as normal filtration stroke, opening / closing of the fine filtration channel, and emergency response to damage are organically integrated into a simple and reliable mechanical system. No electronic sensors are required, achieving intelligent control based on pure physical logic. The inlet and outlet nozzles adopt a standard design with the same diameter, allowing the outlet of the first filter to be directly connected to the inlet of the backup filter after the first filter breaks down. This allows the safe medication that has already passed through fine filtration in the original pipeline to continue to be infused, and a new complete filtration unit to be activated. This achieves a combination of uninterrupted filtration and zero medication waste, greatly improving the flexibility and efficiency of clinical response to emergencies.

[0016] In this invention, the elastic cotton sheet placed under the first filter membrane can buffer the direct compression of the filter sheet by the particles accumulated above, reducing the probability of the filter sheet being damaged by physical pressure. The dual filtration mechanism (second filter membrane and third filter membrane) further ensures the cleanliness of the final output medicine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the elastic lifting mechanism of the present invention; Figure 3 This is a schematic diagram of the second filtration mechanism of the present invention; Figure 4 This is a schematic diagram of the second and third filter membranes of the present invention; Figure 5 This is a schematic diagram of the second structure of the stop ring of the present invention; In the diagram: 1. Shell; 2. Filter chamber; 3. Inlet nozzle; 4. Outlet nozzle; 5. Stop ring one; 6. First filter membrane; 7. Elastic lifting mechanism; 8. Second filter mechanism; 9. Stop ring two; 61. Filter frame one; 62. Filter sheet one; 63. Elastic cotton sheet; 71. Top cover; 72. Spring one; 73. Plunger rod one; 74. Plunger hole one; 81. Plunger hole two; 82. Second filter membrane; 83. Third filter membrane; 84. Plunger rod two; 85. Spring two; 86. Warning rod; 821. Filter frame two; 822. Filter sheet two; 831. Filter frame three; 832. Filter sheet three. Detailed Implementation

[0018] Reference Figures 1-5 The present invention provides a technical solution: a disposable precision anesthetic drug filter, comprising: The shell 1 has a filter chamber 2 inside its cavity. The upper and lower ends of the filter chamber 2 are respectively connected to the inlet nozzle 3 and the outlet nozzle 4. A stop ring 5 is fixed to the wall of the filter chamber 2. The elastic lifting mechanism 7 is located at the upper end of the shell 1, and the lower end of the first filter membrane 6 is installed. The first filter membrane 6 slides on the wall of the filter cavity 2 above the stop ring 5. The second filtration mechanism 8 is located in the filter chamber 2 below the stop ring 5.

[0019] When the anesthetic solution enters through the inlet 3, it is pushed downward by the filtration resistance of the first filter membrane 6. At this time, a pressure filtration space is formed on the first filter membrane 6 to improve the filtration efficiency. In addition, the upper end face of the filter cavity 2 can be fully and tightly attached to the upper end face of the first filter membrane 6. If the anesthetic solution can be safely filtered in one go, when the intact first filter membrane 6 moves upward and resets, it can fully and actively squeeze the anesthetic solution above the first filter membrane 6, so that the anesthetic solution can completely pass through the first filter membrane 6 and avoid the presence of residual anesthetic solution on the upper surface of the first filter membrane 6. The lower end face of the filter cavity 2 is designed with an inverted conical structure, which is conducive to improving the full discharge of the filtered anesthetic solution.

[0020] In this embodiment, the elastic lifting mechanism 7 includes a column hole 74 at the upper end of the shell 1, a top cover 71 at the upper end of the column hole 74, and a plunger rod 73 for connecting the first filter membrane 6 sliding at the lower part of the plunger rod 73. The plunger rod 73 and the top cover 71 are connected by a spring 72.

[0021] Specifically, initially, under the action of spring 72, the first filter membrane 6 is tightly attached to the upper surface of the filter chamber 2. At this time, if the medicine is introduced into the inlet nozzle 3, the medicine will be filtered by the first filter membrane 6 and will also push the first filter membrane 6 downward until the first filter membrane 6 is blocked by the stop ring 5. When the medicine is about to be filtered, as the amount of medicine decreases, the first filter membrane 6 will gradually return to its original position under the action of spring 72. During the filtration process, there may be microparticles such as glass fragments, dust particles, and rubber particles in the medicine. If the first filter membrane 6 is damaged, such as cracks, the pressure in the pressure filtration space formed above the first filter membrane 6 will suddenly be released. This will trigger the second filtration mechanism 8 to close the filtration channel of the medicine. The sudden pressure release allows the operator to clearly perceive and judge the pressure change, thereby stopping the continued filtration of the medicine in time.

[0022] In this embodiment, the second filtering mechanism 8 includes: The second filter membrane 82 is fixed at the lower end of the stop ring 5, and a third filter membrane 83 is provided below it that slides against the wall of the filter chamber 2. Piston hole 2 81 is provided in piston rod 1 73. Piston rod 2 81 for connecting the third filter membrane 83 slides at its lower part, and piston rod 2 81 passes through the second filter membrane 82. Piston rod 2 81 is connected to the upper end of piston hole 2 81 by spring 2 85.

[0023] Specifically, as the amount of liquid medicine above the second filter membrane 82 increases, the spatial pressure above it also increases. As the first filter membrane 6 moves downward, it can gradually drive the third filter membrane 83 to detach from the second filter membrane 82. The liquid medicine is further filtered through the second filter membrane 82 and the third filter membrane 83. The synchronization effect between the first filter membrane 6 and the third filter membrane 83 is reduced by the connection structure of the second spring 85, so that the liquid medicine can be fully filtered and discharged, and the liquid medicine filtration channel can be closed in time when the first filter membrane 6 is damaged.

[0024] In this embodiment, the second filter membrane 82 includes a second filter frame 821 and a second filter sheet 822 evenly distributed on the second filter frame 821, and the third filter membrane 83 includes a third filter frame 831 and a third filter sheet 832 evenly distributed on the third filter frame 831, with the second filter sheet 822 and the third filter sheet 832 being staggered.

[0025] In other words, initially, under the action of spring 85, the second filter membrane 82 and the third filter membrane 83 are tightly attached to each other, thereby causing filter sheet 822 and filter sheet 832 to be misaligned and blocked. When the pressure in the space above the second filter membrane 82 increases, the first filter membrane 6 drives the third filter membrane 83 to detach from the second filter membrane 82, thus forming a continuous filtration channel. If cracks or other damage occur on the first filter membrane 6, the pressure in the pressure filtration space formed above the first filter membrane 6 will suddenly be released, and the first filter membrane 6 will move upward, causing the third filter membrane 83 to be tightly attached to the second filter membrane 82, thus closing the filtration channel of the medicine.

[0026] In this embodiment, a warning rod 86 is fixed to the upper end of the second plunger rod 81, and the warning rod 86 passes through the first plunger rod 73 and the top cover 71 in sequence.

[0027] Initially, the warning rod 86 extends from the upper end of the shell 1. During the filtration of the medicine, the warning rod 86 can enter the top cover 71. When the first filter membrane 6 is displaced, it will also move the warning rod 86 immediately. Therefore, when the warning rod 86 suddenly moves upward, it can also be used as a judgment that the first filter membrane 6 is damaged.

[0028] In this embodiment, a stop ring 9 is provided on the wall of the filter cavity 2 below the third filter membrane 83. The outer surfaces of the first filter membrane 6, the second filter membrane 82, and the third filter membrane 83 are all in close frictional contact with the inner wall of the filter cavity 2, and the maximum downward movement distance of the first filter membrane 6 is set to... When the first filter membrane 6 moves downward and until At that time, it can drive the third filter membrane 83 to move downward.

[0029] In other words, when the liquid medicine enters above the first filter membrane 6 at the first time, a sufficient pressure filtration space is formed. This is to prevent the resistance of the liquid medicine between the second filter membrane 82 and the third filter membrane 83 from affecting the movement of the first filter membrane 6 when the first filter membrane 6 is damaged. This allows the first filter membrane 6 to move upward first, so as to block the liquid inlet 3.

[0030] In this embodiment, the first filter membrane 6 includes a filter frame 61 and filter sheets 62 distributed on the filter frame 61, and the outlet port of the inlet nozzle 3 is corresponding to the filter sheet 62, so that the liquid discharged from the inlet nozzle 3 can pass through the first filter membrane 6.

[0031] In this embodiment, the lower end of the filter sheet 62 is connected to an elastic cotton sheet 63, and the lower side of the elastic cotton sheet 63 is connected to the filter frame 61, so as to reduce the squeezing effect of the particles accumulated on the upper surface of the first filter membrane 6 on the first filter membrane 6.

[0032] In this embodiment, the inner diameter of the inlet nozzle 3 is consistent with the outer diameter of the outlet nozzle 4. That is, when it is determined that the first filter membrane 6 is damaged, a disposable precision anesthetic drug filter is taken again, and the outlet nozzle 4 of the filter with the damaged first filter membrane 6 is connected to the inlet nozzle 3 of the newly taken filter. The drug filtration can then continue, which can flexibly and effectively deal with emergencies, effectively avoid waste of drug, and improve drug filtration efficiency.

[0033] In its specific implementation, it includes the following steps: Step 1: The first filter membrane 6 (main filter) is in place. Under the pre-tightening force of the elastic lifting mechanism, the first filter membrane 6 is lifted upward, and its top is fully and tightly attached to the upper inner wall of the filter chamber 2. Under the action of the second spring, the third filter membrane 83 is pulled upward and tightened, so that it is tightly attached to the second filter membrane 82, and the filter channel is physically blocked. At this time, the warning bar on the third filter membrane 83 extends out of the top cover 71 as a warning judgment indicator. Step 2: The anesthetic solution is injected through the inlet 3. Due to the obstruction of the first filter membrane 6, the solution cannot pass through instantly and accumulates rapidly above the membrane, forming a pressurized filtration space. When the pressure of the solution is sufficient to overcome the elasticity of the spring 72, it pushes the first filter membrane 6 to slide downwards. During this downward movement, the solution is also fully squeezed, forcing it to pass through the filter 62 with higher efficiency to complete the primary filtration. As the first filter membrane 6 moves downwards, the third filter membrane 83 moves downwards synchronously through the plunger rod 84, separating it from the fixed second filter membrane and forming a connected filtration channel. The solution, after primary filtration by the first filter membrane 6, passes through the second filter membrane 82 and the third filter membrane 83 in sequence for fine filtration, further intercepting finer impurities, and finally is discharged to the patient through the outlet 4. Step 3: When the medicine is about to be drained, the flow rate and pressure of the medicine entering the filter decrease. The restoring force of spring 72 begins to dominate, slowly pulling the first filter membrane 6 upward. During the upward reset process of the first filter membrane 6, its top surface will squeeze and filter the residual medicine that is tightly attached to the top wall of the filter chamber, ensuring no medicine residue is wasted and achieving complete delivery of medicine. Under the buffer adjustment of spring 85, the third filter membrane 83 moves upward smoothly with the first filter membrane 6 and finally re-attaches to the second filter membrane 82, closing the fine filtration channel. Step 4: If sharp particles in the liquid puncture the first filter membrane 6 under high pressure, the pressure in the pressure filtration space above the membrane will be released instantly. The sudden drop in pressure causes the downward force acting on the first filter membrane 6 to disappear. The restoring force of spring 72 immediately and quickly pulls the first filter membrane 6 upward. The rapid upward movement of the first filter membrane 6 instantly pulls the third filter membrane 83 upward through the plunger rod 84, making it quickly and tightly adhere to the second filter membrane 82, closing the downstream flow path and preventing the liquid that has not been filtered by the first stage from continuing to flow out. Step 5: In step 4, the operator will clearly feel the sudden disappearance of injection or infusion resistance (hand pressure relief). As the third filter membrane 83 moves rapidly upward, the warning lever 86 pops out from the top cover, providing a clear visual alarm signal. After the first filter membrane 6 is damaged and shut off in an emergency, in order to avoid wasting the remaining filtered medication, i.e. the medication located downstream of the first filter membrane and in the connecting pipeline, immediately take a new filter of the same model and directly connect the outlet 4 of the damaged filter to the inlet 3 of the new filter. The medication can then flow through the new filter for complete filtration, thereby avoiding medication waste in emergency situations, ensuring uninterrupted filtration, and greatly improving the flexibility and efficiency of clinical response.

[0034] The above description is merely a preferred embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A disposable anesthetic precision liquid filter, characterized by, It includes: The shell (1) is provided with a filter cavity (2) in the cavity, the upper and lower ends of the filter cavity (2) are connected with the liquid inlet nozzle (3) and the liquid outlet nozzle (4) respectively, and the cavity wall of the filter cavity (2) is fixed with a stop ring one (5); The elastic lifting mechanism (7) is arranged at the upper end of the shell (1), and the lower end is provided with a first filter membrane (6) which slides on the cavity wall of the filter cavity (2) above the stop ring one (5); The second filter mechanism (8) is arranged in the filter cavity (2) below the stop ring one (5).

2. The disposable anesthetic precision liquid filter according to claim 1, wherein The elastic lifting mechanism (7) includes a column hole one (74) arranged at the upper end of the shell (1), the upper end of which is provided with a top cover (71), and the lower part is slidably provided with a plunger rod one (73) for connecting the first filter membrane (6), and the plunger rod one (73) is connected with the top cover (71) through a spring one (72).

3. The disposable anesthetic precision liquid filter according to claim 2, wherein The second filter mechanism (8) includes: The second filter membrane (82) is fixed at the lower end of the stop ring one (5), and the third filter membrane (83) is arranged below the second filter membrane (82) and slides on the cavity wall of the filter cavity (2); The column hole two (81) is arranged in the plunger rod one (73), and the lower part is slidably provided with a plunger rod two (81) for connecting the third filter membrane (83), and the plunger rod two (81) penetrates the second filter membrane (82), and the plunger rod two (81) is connected with the upper end of the column hole two (81) through a spring two (85).

4. The disposable anesthetic precision liquid filter according to claim 3, wherein The second filter membrane (82) includes a filter frame two (821) and filter sheets two (822) uniformly distributed on the filter frame two (821), the third filter membrane (83) includes a filter frame three (831) and filter sheets three (832) uniformly distributed on the filter frame three (831), and the filter sheets two (822) and the filter sheets three (832) are arranged in a staggered manner.

5. The disposable anesthetic precision liquid filter according to claim 3, wherein The upper end of the plunger rod two (81) is fixed with a warning rod (86), and the warning rod (86) penetrates the plunger rod one (73) and the top cover (71) in sequence.

6. The disposable anesthetic precision liquid filter according to claim 3, wherein The cavity wall of the filter cavity (2) below the third filter membrane (83) is provided with a stop ring two (9), the outer side surface of the first filter membrane (6), the second filter membrane (82) and the third filter membrane (83) is in close contact with the inner wall of the filter cavity (2), and the maximum distance of the downward movement of the first filter membrane (6) is When the first filter membrane (6) moves downward and until , the third filter membrane (83) can be driven to move downward.

7. The disposable anesthetic precision liquid filter of claim 1, wherein The first filter membrane (6) includes a filter frame one (61) and filter sheets one (62) distributed on the filter frame one (61), and the filter sheets one (62) correspond to the filter sheets one (62) at the outlet port of the liquid inlet nozzle (3).

8. The disposable anesthetic precision liquid filter according to claim 7, wherein The lower end of the filter sheet one (62) is connected with an elastic cotton sheet (63), and the side lower end of the elastic cotton sheet (63) is connected with the filter frame one (61).

9. The disposable anesthetic precision liquid filter of claim 1, wherein, The inner diameter of the liquid inlet nozzle (3) is consistent with the outer diameter of the liquid outlet nozzle (4).

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