Hydraulic infusion system
By setting an outer packaging structure around the liquid bag and filling it with inert gas or a vacuum environment, the problem of air bubbles entering the hydraulic fluid delivery system is solved, improving working accuracy and space utilization, and reducing equipment costs.
Patent Information
- Application Number
- CN202423041760.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In existing hydraulic fluid delivery systems, the material of the fluid bag cannot simultaneously meet the requirements of good gas sealing, elasticity, and cost control, which leads to air bubbles entering the fluid bag, affecting working accuracy and space utilization.
An outer packaging structure is set up outside the liquid bag, and the packaging space is filled with inert gas or a vacuum environment is formed to form an isolation barrier to prevent external gases from entering the liquid bag. Helium is used to reduce gas solubility.
It effectively prevents bubble formation, improves the working accuracy and space utilization of the hydraulic fluid delivery system, and reduces equipment costs.
Smart Images
Figure CN223914478U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical device technology and relates to hydraulic infusion systems. Background Technology
[0002] The hydraulic infusion system is based on a volumetric micro-pump that draws hydraulic fluid from a hydraulic reservoir and pumps it into the pressure chamber of a drug reservoir, thereby pushing a piston inside the drug reservoir and further pushing the drug liquid out of the reservoir.
[0003] The hydraulic reservoir may include a liquid bag. In a hydraulically driven delivery system, hydraulic fluid is stored in a flexible liquid bag, and the outlet of the liquid bag is connected to the inlet of a volumetric pump. The inlet of the volumetric pump is connected to the liquid bag, and the outlet is connected to the hydraulic fluid inlet of the reservoir. Upon receiving a pumping signal, the volumetric pump draws a rated volume V of driving fluid from the liquid bag and pumps it into the reservoir. After the rated volume V of hydraulic fluid is pumped into the pressure chamber of the reservoir, the hydraulic fluid pushes a piston forward, outputting the same volume V of medication from the outlet.
[0004] For hydraulically driven fluid delivery systems, it is crucial to minimize the intake of air bubbles from the hydraulic fluid into the volumetric pump, as this can affect accuracy. However, storing hydraulic fluid in a fluid bag presents several challenges, making it difficult to effectively address the issue of dissolved gas entering the fluid bag:
[0005] 1. The material of the liquid bag needs to have very good gas sealing performance: This is because the liquid bag material needs to effectively isolate external gases to prevent external gases from passing through the liquid bag material during long-term storage in the volumetric pump system and dissolving into the liquid inside the liquid bag. This would cause the gas solubility of the liquid inside the liquid bag to increase, and when the external temperature changes, the liquid inside the liquid bag would precipitate internal gases due to changes in solubility, forming bubbles. This could cause the volumetric pump to draw in bubbles, affecting the working accuracy.
[0006] 2. The material of the liquid bag needs to have good elasticity: the reason is that a liquid bag with poor elasticity can store less liquid in the same space (low space utilization).
[0007] 3. The cost of the liquid bag should not be too high.
[0008] However, it is difficult for the material of the liquid bag to meet all three conditions at the same time. Utility Model Content
[0009] The purpose of this invention is to provide a hydraulic infusion system that solves the problem of how to avoid air bubbles in the liquid bag.
[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0011] This utility model provides a hydraulic infusion system, including a pressure reservoir, a volumetric pump, a drug reservoir, and a housing. The pressure reservoir, the volumetric pump, and the drug reservoir are housed within the housing. The pressure reservoir includes a liquid bag filled with pressurized fluid, the liquid bag being made of a flexible membrane material. The drug reservoir has a pressure chamber and a drug chamber. The inlet of the volumetric pump is connected to the outlet of the liquid bag, and the outlet of the volumetric pump is connected to the pressure chamber. The system also includes an outer packaging structure that surrounds the housing or the liquid bag. By configuring the packaging space within the outer packaging structure, an isolation barrier is created on the surface of the liquid bag.
[0012] Preferably, the isolation barrier is formed by an inert gas filling the packaging space.
[0013] Furthermore, the inert gas is helium.
[0014] Preferably, the isolation barrier is formed by a vacuum cavity created by evacuating the packaging space.
[0015] Preferably, the outer packaging structure is made of flexible or rigid materials.
[0016] Preferably, a support structure is provided between the outer packaging structure and the liquid bag.
[0017] Furthermore, the supporting structure is provided on the inner surface of the outer packaging structure.
[0018] Furthermore, the outer surface of the liquid bag is provided with the support structure.
[0019] Furthermore, the support structure is provided around the outer periphery of the liquid bag.
[0020] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0021] The hydraulic infusion system of this utility model has an added outer packaging structure and a configuration of the packaging space within the outer packaging structure, which changes the environment of the liquid bag and forms an isolation barrier on the surface of the liquid bag, making it difficult for air to pass through the liquid bag and dissolve into the hydraulic fluid, thus making it less likely for air bubbles to appear in the liquid bag. Attached Figure Description
[0022] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:
[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the hydraulic infusion system of this utility model;
[0024] Figure 2 This is a structural schematic diagram of Example 3;
[0025] Figure 3 This is a structural schematic diagram of Example 4;
[0026] Figure 4 This is a schematic diagram of the pressurized liquid reservoir structure in Example 5;
[0027] The reference numerals in the attached figures are explained as follows:
[0028] 1. Liquid reservoir; 11. Liquid bag; 2. Volumetric pump; 3. Liquid reservoir; 31. Pressure chamber; 32. Liquid chamber; 33. Piston; 34. Discharge port; 4. Circuit board; 5. Battery; 6. Outer packaging structure; 61. Packaging space; 7. Support structure; 8. Outer shell. Detailed Implementation
[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0030] Example 1
[0031] like Figure 1 As shown, the hydraulic infusion system mainly includes a pressure reservoir 1, a volumetric pump 2, a drug reservoir 3, and a housing 8. The pressure reservoir 1, volumetric pump 2, and drug reservoir 3 are housed within the housing 8. The housing 8 is not completely sealed.
[0032] The volumetric pump 2 draws hydraulic fluid from the pressure reservoir 1 and pumps it into the pressure chamber 31 of the drug reservoir 3. The hydraulic fluid pushes the piston 33 downward, causing the drug solution in the drug solution chamber 32 to be output from the outlet 34. The circuit board 4 is used to send pumping commands and supply power to the volumetric pump 2, and the battery 5 supplies power to the circuit board 4. All of the above structures are encapsulated in the outer packaging structure 6 at the factory. At the time of shipment, the drug solution chamber 32 is empty. During clinical use, the drug solution can be injected into the drug solution chamber 32 from the outlet 34 or a separate injection port (not shown).
[0033] The hydraulic reservoir 1 includes a liquid bag 11, which stores hydraulic fluid. The liquid bag 11 is made of a membrane material with elasticity and is flexible.
[0034] The outer packaging structure 6 encloses the outer shell 8, and the interior of the outer packaging structure 6 is a packaging space 61. The packaging space 61 is filled with inert gas. The inert gas fills the interlayer between the outer packaging structure 6 and the outer shell 8, and also fills the interior of the outer shell 8. This creates an inert gas-filled environment around the liquid bag 11, providing an insulating barrier on the surface of the liquid bag 11 and preventing easily soluble external gases such as air from passing through the liquid bag 11 and dissolving into the hydraulic fluid. Thus, without increasing the weight of the equipment (the outer packaging structure 6 is discarded after opening), the hydraulic reservoir 1 is encased in inert gas during shelf storage.
[0035] In this example, helium is chosen as the inert gas. This leverages helium's characteristic of having the lowest solubility of all gases (less than half that of air) to significantly reduce the problem of excessive gas dissolution in the hydraulic fluid inside the liquid bag 11 after long-term storage. Data shows that at 20 degrees Celsius and standard atmospheric pressure, helium dissolves in 8.61 ml of pure water, while oxygen dissolves in 31 ml, and hydrogen dissolves in 20 ml. This demonstrates the very low solubility of helium in liquids.
[0036] Example 2
[0037] The difference between this example and Example 1 is that the outer packaging structure 6 is vacuumed, and the structure inside the outer shell 8 is also vacuumed. The liquid bag 11 is in a vacuum environment, which forms an isolation barrier on the surface of the liquid bag 11, blocking external gases such as air, thereby reducing the amount of gas molecules that can pass through the liquid bag 11 and dissolve into the hydraulic fluid.
[0038] Example 3
[0039] like Figure 2 The difference between this example and Example 1 is that the outer packaging structure 6 is located around the liquid reservoir 1. The packaging space 61 between the outer packaging structure 6 and the liquid bag 11 is filled with inert helium gas.
[0040] Example 4
[0041] like Figure 3 The difference between this example and Example 1 is that the outer packaging structure 6 directly surrounds the outer periphery of the liquid bag 11, and the outer packaging structure 6 is vacuum-sealed.
[0042] Example 5
[0043] like Figure 4The difference between this example and embodiment 4 is that a support structure 7 is provided on the inner surface of the outer packaging structure 6. The support structure 7 can be a support strip, support column, or formed by the texture of the inner surface of the outer packaging structure 6. Regardless of whether the outer packaging structure 6 is flexible or rigid, the support structure 7 can prevent large-area adhesion between the liquid bag 11 and the outer packaging structure 6, thus forming a larger isolation barrier on the surface of the liquid bag 11. In other embodiments, the support structure 7 can also be provided on the surface of the liquid bag 11, or a support structure 7 can be fitted around the outer periphery of the liquid bag 11.
[0044] In summary, the above embodiments, by setting the environment around the liquid bag 11, place the liquid bag 11 in an inert gas or vacuum environment. This environment forms an isolation barrier on the surface of the liquid bag 11, blocking external gases such as air that can pass through the membrane material of the liquid bag 11 and are easily soluble in the driving liquid. This makes it less likely for air bubbles to appear in the liquid bag 11, thereby improving the quality of the hydraulic fluid delivery system.
[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.
Claims
1. A hydraulic infusion system comprising a pressure liquid reservoir (1), a volumetric pump (2), a medicine liquid reservoir (3) and a housing (8), the pressure liquid reservoir (1), the volumetric pump (2) and the medicine liquid reservoir (3) being placed in the housing (8), the pressure liquid reservoir (1) comprising a liquid bag (11) filled with pressure liquid, the liquid bag (11) being made of flexible film material, the medicine liquid reservoir (3) having a pressure chamber (31) and a medicine liquid chamber (32), a liquid inlet of the volumetric pump (2) being used to connect with a liquid outlet of the liquid bag (11), a liquid outlet of the volumetric pump (2) being used to connect with the pressure chamber (31), characterized in that: Also included is an outer packaging structure (6) that surrounds the housing (8) or the liquid bag (11), and the surface of the liquid bag (11) is provided with an isolation barrier by configuring a packaging space (61) inside the outer packaging structure (6).
2. The hydraulic infusion system of claim 1, wherein: The isolation barrier is formed by inert gas filled in the packaging space (61).
3. The hydraulic infusion system of claim 2, wherein: The inert gas is helium.
4. The hydraulic infusion system of claim 1, wherein: The isolation barrier is formed by a vacuum cavity formed by vacuumizing the packaging space (61).
5. The hydraulic infusion system of claim 1, wherein: The outer packaging structure (6) is made of a flexible material or a rigid material.
6. The hydraulic infusion system of claim 1, wherein: A support structure (7) is provided between the outer packaging structure (6) and the liquid bag (11).