Constant liquid medicine conveying method and infusion device

Abstract

The invention provides a constant liquid medicine conveying method and an infusion device, and belongs to the technical field of fluid conveying, in the liquid medicine conveying process, replenishing liquid is continuously injected into a liquid medicine container, and the density of the replenishing liquid is the same as or similar to that of the liquid medicine; in the whole conveying process of the liquid medicine, the liquid volume corresponding to the volume of the liquid medicine at the initial moment always exists in the liquid medicine container, so that the liquid pressure at the outlet end is always kept within a set range. A first storage vessel, a liquid medicine container and a second storage vessel in the infusion device are sequentially arranged from top to bottom, the bottom of the first storage vessel is communicated with the bottom of the second storage vessel, the second storage vessel is communicated with the top end of the liquid medicine container, and when the first storage vessel continuously replenishes replenishment liquid into the liquid medicine container through the second storage vessel, the replenishment liquid is continuously replenished into the liquid medicine container. And the liquid in the liquid medicine container always has the liquid medicine volume at the initial moment. The constant flow velocity of the liquid medicine can be accurately and conveniently realized, the structural principle is simple and ingenious, and the implementation is easy.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid delivery, and more specifically relates to a method and an infusion device for constant delivery of a liquid medicine. Background Art

[0002] In the process of clinical medical treatment and drug production and preparation, it is often necessary to transport liquid medicine to a specific target object or to a specific storage area. There are many occasions where there are strict requirements on the speed or amount of liquid medicine delivery. In theory, in many cases, the smoother the liquid medicine delivery, the better the effect.

[0003] In clinical medicine, when patients are given drug infusions, such as intravenous infusions or common enema operations, although the two methods deliver the drug to different parts of the body, they both use a hanging container that relies on the pressure generated by the weight of the internal liquid to deliver the drug downward.

[0004] For example, when performing enema, especially retention enema, an existing treatment method is to mix dragon's blood, tin powder and physiological saline in a predetermined ratio, put them into an enema bag, hang the enema bag upside down like an infusion bag or a hanging bottle, and then pass the built-in liquid medicine through an anal cannula on a delivery pipeline through the anus directly into the rectum, and finally deliver it to the patient's rectum. Since retention enema usually takes 15 minutes to half an hour, in order to improve the enema effect, it may take longer in some cases. During this period, the patient needs to always remain in the left side lying position with his legs bent, so that the continuously injected enema liquid can fill the designated intestinal cavity more evenly and stably to achieve the expected therapeutic effect. In the above-mentioned medical process, based on the conveying power of gravity squeezing or pressure of the liquid in the bag, the conveying speed of the liquid medicine in the enema bag is gradually slowed down as the liquid level in the bag gradually decreases. Although, generally, a simple switch valve is provided on the pipeline for conveying the liquid medicine, and the flow rate and flow velocity can be changed by the switch, the liquid level in the enema bag is always in dynamic change. Therefore, even if the switch valve is opened to the set position, the corresponding flow velocity will not always be stable and consistent. In addition, the patient is in a side-lying posture, and it is not convenient to operate the switch valve during this period. It is also impossible to maintain a constant flow rate by operating the switch valve to more accurately convey and infuse the liquid medicine. As a result, the areas where these liquid medicines can reach and disperse within the set time after entering the patient's intestinal cavity are inconsistent, which will affect the theoretical efficacy under the set drug dosage, and this degree of influence cannot be offset in advance by increasing or decreasing the drug dosage. In addition, during the entire retention enema period, the patient is required not to move the body at will and must maintain the above-mentioned posture. Therefore, unlike intra-abdominal hot perfusion chemotherapy, the patient cannot move the body through auxiliary equipment or self-movement when necessary, so that the drug solution can fully and evenly contact the lesion site within a reasonable time.

[0005] In addition to the above-mentioned occasions encountered in clinical medical treatment, the problem of constant delivery of liquid medicine is also faced in the process of preparing or delivering liquid medicine in pharmaceutical companies or hospitals. For example, when delivering liquid medicine to a dispenser through a delivery pipeline, one of the methods is to set the flow rate to a specific value, and then achieve the corresponding flow measurement by setting the delivery time, and then realize the corresponding drug compatibility. Under this existing operation method, it is often impossible to timely and accurately intervene in the delivery of liquid medicine, because there is still the problem of reduced pressure at the bottom outlet when the liquid level drops, that is, the pressure driving the fluid flow is always changing.

[0006] The applicant also conducted a prior art search with a specialized patent analyst and found that in the prior art, in order to solve the above problems, active pressurization is basically used to dynamically limit the pressure in the delivery pipeline or the corresponding container, and then achieve a constant flow rate of the liquid. However, based on the applicant's own professional experience, it is too cumbersome and impractical for clinical medical treatment, and the fundamental defects of the above problems have not been taken seriously and remedied. For example, in the relevant technical literature retrieved, a disposable adjustable pressure infusion pump disclosed in the Chinese patent with publication number CN204890800U, an air-powered liquid medicine delivery device disclosed in the Chinese patent with publication number CN108837229B, and a peristaltic pump high-pressure syringe and its flow rate adjustment method, etc., all use active pressurization, and additional mechanical structures for pressure application or supporting pressure supply equipment to maintain a stable flow rate. However, these designs are not only complex in structure, but also relatively troublesome to implement, especially for medical personnel. Without the assistance of professional equipment developers, the technical principles are obscure and difficult to understand, and these existing technologies still do not take into account the impact of the pressure change of the liquid inside the container when the liquid flows out of the container. They simply actively interfere through the synergy of adding external pressure-driven elements. Therefore, in theory, there will still be accumulated errors in this regard; moreover, in the existing technology, the feedback action of maintaining the pressure of the corresponding pressure change of the liquid medicine requires time to execute, so there is also a lag in the control. The accumulation of various factors has resulted in the fact that the principle structure of the liquid medicine delivery flow rate control is not only cumbersome, but also the accuracy of delivery still needs to be improved. Summary of the invention

[0007] In view of the technical status mentioned in the background technology, in order to overcome the corresponding defects in the prior art, the present invention particularly discloses a method for constant delivery of liquid medicine and an infusion device, which can better solve the problems raised in the background technology.

[0008] In order to overcome the defects of the prior art, those skilled in the art provide the following technical solutions: a method for constant delivery of liquid medicine, comprising setting the outlet end of a liquid medicine container downward so that the liquid medicine is delivered downward through at least one delivery pipe connected to the outlet end under the action of its own gravity, and continuously injecting a replenishing liquid into the liquid medicine container during the delivery of the liquid medicine, wherein the density of the replenishing liquid is the same as that of the liquid medicine, or the density difference between the two is within a set range; the delivery principle of the replenishing liquid is that, during the entire liquid medicine delivery process, there is always an amount of liquid in the liquid medicine container corresponding to the volume of the liquid medicine at the initial moment, so as to ensure that the liquid pressure at the outlet end is always maintained within a set range.

[0009] Preferably, an overflow hole is provided at the top of the medicine liquid container. When replenishing liquid into the medicine liquid container, the flow rate of the replenishing liquid must be such that there is always liquid overflowing from the overflow hole in the medicine liquid container, so as to maintain the liquid volume in the medicine liquid container always equal to the medicine liquid volume corresponding to the initial moment.

[0010] Furthermore, a solenoid valve is installed at the outlet end of the liquid medicine container, and the volume of the supplementary liquid added to the liquid medicine container is v1, the volume of the liquid flowing out of the overflow hole is v2, and the volume of the liquid medicine that needs to be initially transported in the liquid medicine container is k;

[0011] When the liquid medicine is not delivered, v1-v2=0;

[0012] When the liquid medicine is being transported and v1-v2=k, the solenoid valve is immediately closed.

[0013] Preferably, when the replenishing liquid is not the delivered medicine, the medicine is stored in a soft membrane bag, and the membrane bag is placed in the medicine container. The membrane bag maintains seamless contact with the inner wall of the medicine container due to the filling and squeezing of the internal medicine, and the liquid outlet of the membrane bag faces downward so that the medicine can flow out from the outlet end after flowing out of the membrane bag.

[0014] Preferably, when the replenishing liquid is not the delivered medicine, a vertically sliding partition is arranged in the medicine container, the density of the sliding partition is the same as the density of the medicine, or the density difference between the two is within the set range, and the sliding partition completely separates the replenishing liquid and the medicine from top to bottom.

[0015] In addition, the present invention also proposes a constant infusion device for liquid medicine, which mainly includes the liquid medicine container and the delivery pipeline mentioned above, and also includes two storage dishes for containing the replenishing liquid, and the first storage dish, the liquid medicine container, and the second storage dish are arranged in sequence from top to bottom, wherein the bottom of the first storage dish is connected to the bottom of the second storage dish, and the second storage dish is connected to the top of the liquid medicine container, so that when the first storage dish continuously replenishes the replenishing liquid into the liquid medicine container through the second storage dish, the liquid medicine container can always have the same amount of liquid as the volume of liquid medicine corresponding to the initial moment.

[0016] Preferably, a floating plate capable of floating on the replenishing liquid is provided in each of the two storage vessels, and a guide rod having axial scale lines is vertically fixed on each floating plate, and the guide rod vertically slides through the top wall of the storage vessel, wherein the scale lines on the first guide rod in the first storage vessel increase from bottom to top, and the scale lines on the second guide rod in the second storage vessel decrease from bottom to top, and in an initial state, the zero scale lines of the two guide rods just expose the top surface of their respective corresponding storage vessels.

[0017] Furthermore, the diameters of the two storage dishes are the same, and a contact switch with an adjustable installation height is provided above the guide rod on the top of each storage dish. The contact switch controls the opening and closing of the delivery pipeline. When the guide rod moves up to contact the contact switch or has a set distance, the contact switch is immediately closed. Among them, a displacement sensor and a calculation module can also be provided on one side of the top of each storage dish; the displacement sensor is used to detect the vertical displacement of each guide rod, and the calculation module is used to calculate the volume difference between the replenishing liquid flowing out of the first storage dish and the replenishing liquid in the second storage dish, and the volume difference is equal to the cross-sectional area of ​​the inner cavity of the storage dish multiplied by the difference in displacement detected by the two displacement sensors.

[0018] Preferably, a recessed liquid storage tank is provided on one side of the inner bottom surface of the second storage vessel, the outlet end of the connecting pipe between the two storage vessels is connected to the liquid storage tank, and the volume of the liquid storage tank is equal to the internal volume of the connecting pipe.

[0019] Preferably, the inner bottom end of the medicine liquid container is a funnel-shaped structure, and the medicine liquid container also has a built-in soft membrane bag for containing the medicine liquid, the membrane bag is a cylindrical bag-like structure with a conical bottom end, and the bottom end of the membrane bag is coaxially fixedly fitted on the inner bottom end of the medicine liquid container, and is firmly wedged into the side edge of the inner bottom end of the medicine liquid container by a sealing ring lined on the side edge of the inner bottom end of the membrane bag; a liquid outlet is provided at the cone tip of the membrane bag, and the liquid outlet is connected to the outlet end of the medicine liquid container.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the constant liquid medicine delivery method and delivery device provided by the present invention are based on the existing principle of pressure infusion, and dynamically supplement the density-matched supplementary liquid to maintain the pressure of liquid medicine delivery. They can be well applied to some occasions requiring constant-speed delivery of liquid medicine encountered in clinical medicine, drug trials or pharmaceutical production, and can be fully realized by adopting very simple principles and structural designs. Moreover, the control of the constant speed of the liquid medicine requires almost no feedback adjustment time, because once it is turned on, it is always at a constant flow rate, so there is no lag in the adjustment of the flow rate, and no professional design, use and maintenance knowledge is required. The overall process is easy to understand, and the control of the liquid medicine flow rate can be perfectly achieved.

[0021] For example, the constant infusion device of the liquid medicine based on the constant delivery method of the liquid medicine has a simple structure but is very clever. It can be directly used in other infusion operations such as intravenous infusion or retention enema. The enema solution formed by dragon's blood, tin powder and physiological saline is input into the rectum through the patient's anus at a constant flow rate, so that the infusion of the liquid medicine is more uniform and stable, which effectively solves the contradiction that if the enema solution in the intestinal cavity is to be more evenly distributed, the body needs to be moved, but the retention enema process requires the patient to always maintain the left lateral decubitus position with legs bent when receiving treatment. Even if the patient does not move the body, the liquid medicine can evenly reach the intestinal cavity, and then fully dispersed in the designated section of the intestinal cavity within the set enema time. And the control method of the constant delivery speed of the liquid medicine of the present invention can easily and accurately directly obtain the required constant flow rate, which is convenient for pharmaceutical production by pharmaceutical companies, or quantitative addition, packaging and storage of related liquids of self-prepared liquid medicine in hospitals.

[0022] Other functions and features of the present invention will be specifically introduced in the subsequent embodiments to provide a full understanding of the concept of the present invention and thus to apply it to production practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following are auxiliary illustrations for explaining some specific embodiments of the present invention. The drawings described are mainly the principles of the specific operation execution structures or methods of some embodiments of the present invention. However, this does not mean that the physical structure or operation steps of the present invention can only be as shown in the drawings.

[0024] Figure 1 It is a schematic diagram of the structural principle of a device for constant infusion of liquid medicine based on the method for constant delivery of liquid medicine of the present invention;

[0025] Figure 2 A specific structural diagram of a built-in membrane bag in a liquid medicine container;

[0026] Figure 3A specific structural diagram of a built-in sliding partition for a liquid medicine container;

[0027] Figure 4 for Figure 1 A magnified view of the structure at center A;

[0028] Figure 5 for Figure 1 A magnified view of the structure at point B.

[0029] The components shown in the figure are numbered as follows: medicine liquid container 1, liquid storage tank 2, second storage dish 3, connecting pipe 4, first guide rod 5, floating plate 6, first storage dish 7, second guide rod 8, conveying pipe 9, displacement sensor 10, membrane bag 11, sealing ring 12, sliding partition 13. DETAILED DESCRIPTION

[0030] Based on the several drawings in the embodiments of the present invention and referring to the following text description, a relatively clear and complete introduction of the technical scheme in the embodiments of the present invention can be made. However, it should be understood that the embodiments mentioned in this article are only one or several specific methods of the present invention, and not all implementation structures or method steps.

[0031] like Figure 1As shown, as a specific embodiment of the present invention, a method for constant delivery of liquid medicine is recorded, and the main operating steps are: the outlet end of the liquid medicine container 1 is set downward, so that the liquid medicine container 1 can be pre-loaded with a rated amount of liquid medicine, for example, when the liquid medicine container 1 is a bottle, it can be a full bottle of liquid medicine, if the liquid medicine container 1 is a plastic bag, such as an enema bag, it can be a full bag of liquid medicine, or if the liquid medicine container 1 is a plastic tank, it is a full tank of liquid medicine that needs to be delivered. Under the action of their own gravity, these liquid medicines will form a specific pressure on the outlet end of the bottom of the liquid medicine container 1, and then squeeze the liquid medicine out of the outlet end. Specifically, it is mainly transported downward through at least one delivery pipe 9 connected to the outlet end, and then transported to the target container or target area. A key design is that the operator must continuously inject the supplementary liquid into the liquid medicine container 1 during the process of delivering the liquid medicine. Moreover, it is very important that the density of the supplementary liquid is the same as that of the liquid medicine, or the density difference between the supplementary liquid and the liquid medicine is within a set reasonable range, for example, the ratio between the density of the supplementary liquid and the density of the liquid medicine is between 0.95-1.05. For the liquid medicine, considering that it will eventually be used in the human body, physiological saline can be used as the supplementary liquid. Specifically, the density of the saline can be adjusted by adding a certain amount of salt to the water, so that the density of the supplementary liquid reaches the set ratio range, and can be as close as possible to the density of the liquid medicine, and it is best to adjust the density to be exactly the same. At the same time, in the specific implementation, the delivery method of the supplementary liquid, or the filling method, needs to meet the following conditions: that is, during the entire delivery process of the liquid medicine, there must always be a liquid volume corresponding to the initial moment in the liquid medicine container 1. For example, the initial moment of the liquid medicine is 800ml, then during the liquid medicine delivery process, at a certain moment, the volume of the liquid medicine in the liquid medicine container 1 is 500ml, then the volume of the supplementary liquid added at this time is 300ml, so that it can be ensured that the liquid pressure value at the outlet end is maintained within a set range from beginning to end, especially maintained at a specific value, because once the sum of the supplementary liquid with the same density as the liquid medicine in the liquid medicine container 1 plus the remaining liquid medicine is equal to the remaining liquid medicine at the initial moment. Rated amount, then at this moment, the pressure at the outlet end of the medicine container 1 is certain and remains constant, and then the flow rate and flow rate of the medicine flowing out from the outlet end into the infusion pipeline will always remain unchanged, truly realizing that the flow rate is constant during the dynamic delivery of the medicine, and there will be no step-like change process of flow regulation, and there is almost no time spent on adjustment to achieve a constant flow rate, and there is no lag in adjusting the speed, because as long as the medicine container 1 is ensured to be in an overflow state, the pressure at the outlet end of the medicine container 1 will not change, and there is no need for some additional auxiliary components to perform special actions in order to make the flow rate tend to a constant value during the entire medicine delivery process.

[0032] As a specific implementation, an overflow hole can be provided at the top of the medicine liquid container 1, so that the liquid in the medicine liquid container 1 can automatically overflow when the rated volume exceeds the rated volume. Moreover, in order to achieve this continuous overflow state, it is required that when the replenishing liquid is added into the medicine liquid container 1, the flow rate of the replenishing liquid must be large enough to ensure that there is always liquid overflowing from the overflow hole in the medicine liquid container 1, so that the liquid volume in the medicine liquid container 1 is always equal to the corresponding medicine liquid volume at the initial moment, that is, equal to the rated volume of the pre-loaded medicine liquid in the medicine liquid container 1, so that the pressure at the outlet end at the bottom of the medicine liquid container 1 remains unchanged.

[0033] In order to realize the automatic start and stop of the drug liquid delivery, a solenoid valve (not numbered in the figure) can be installed at the outlet end of the drug liquid container 1, and the solenoid valve is opened when the drug liquid needs to be delivered. As an example of the reagent application of this method, it can be assumed that the volume of the supplementary liquid added to the drug liquid container 1 is v1, the volume of the liquid flowing out of the overflow hole is v2, and the volume of the drug liquid that needs to be delivered in the drug liquid container 1 is k, that is, the pre-loaded amount of the drug liquid is k milliliters. At the beginning of delivery, when the drug liquid is not delivered, the supplementary liquid flowing into the drug liquid container 1 must be equal to the drug liquid flowing out of the overflow hole, that is, v1-v2=0, and when the drug liquid is in the process of delivery, part of the supplementary liquid flows into the drug liquid container 1 for storage, and the other part flows out of the overflow hole to maintain the overflow state. Therefore, the amount of supplementary liquid injected into the drug liquid container 1 must be greater than the maximum flow rate at which it can output the drug liquid to the outside, which is the safest. During the delivery process, once v1-v2=k, it means that the volume of the supplementary liquid left in the drug liquid container 1 has been It is equal to the volume of the pre-filled medicine container 1, which indirectly indicates that the medicine in the medicine container 1 has been completely drained, or has been drained to the set rated volume. The medicine delivery is completed, and the solenoid valve must be closed immediately to stop the continued output of liquid from the medicine container 1, thereby achieving constant delivery of the rated amount of medicine. No additional flow rate detector or flow meter is required for judgment, and there is no complicated signal conversion during the process. The medicine flow or flow rate is directly and efficiently locked. In other words, once the flow rate is constant, the flow rate within the corresponding time is also constant.

[0034] In the above embodiment, the replenishing liquid used for filling can be the liquid medicine directly when conditions permit, so the density problem does not need to be considered and it is easiest to implement. However, generally speaking, when delivering liquid medicine, no matter to what object it is delivered, it is best not to have waste or residue, even if the residual amount is small. Therefore, in this embodiment, in order to optimize the delivery method, the selected replenishing liquid is certainly not the liquid medicine being delivered, but other liquids whose density meets the above requirements, such as self-prepared physiological saline of the corresponding density. What is very special is that during operation, if Figure 2, is to store the medicine liquid in a soft film bag 11, and then put the film bag 11 into the medicine liquid container 1. Because the film bag 11 itself is very thin and soft, and the volume of the plastic material used to make a film bag 11 (here we are talking about the volume of the film bag 11 material, not the volume of the liquid inside the film bag 11) is very small relative to the volume of the medicine liquid, and can be almost ignored. Therefore, its effect on the density is actually not significant. It can be considered that there are only two substances in the medicine liquid container 1: the supplementary liquid and the medicine liquid; and the film bag 11 itself is soft in texture. After being filled with the medicine liquid, the interior is filled with a certain pressure. Once The medicine liquid leaks out or flows out gradually, and the entire membrane bag 11 filled with the medicine liquid is like a soft ball of mercury, freely sliding or rolling down along the smooth inner wall membrane of the medicine liquid container 1. At the same time, due to the filling and squeezing of the medicine liquid in the bag, the bag can maintain a certain seamless contact with the inner wall of the medicine liquid container 1 during the sliding or rolling process, and the supplementary liquid cannot pass through the membrane bag 11 and penetrate to the bottom of the membrane bag 11, so that the medicine liquid in the membrane bag 11 always flows out of the medicine liquid container 1, and the liquid outlet of the membrane bag 11 faces downward, so that the medicine liquid can flow out from the outlet end immediately after flowing out of the membrane bag 11. Of course, in order to better ensure that the supplementary liquid and the medicine liquid do not mix and contact with each other, such as Figure 2 As shown, the inner bottom end of the medicine liquid container 1 here is a funnel-shaped structure with the tip facing downward, and, correspondingly, the membrane bag 11 built into the present medicine liquid container 1 also has a conical structure at the bottom, so that the overall structure is a cylindrical bag-like structure with a conical tip at the bottom, and, more importantly, the bottom end of the membrane bag 11 is coaxially fixedly attached to the inner bottom end of the medicine liquid container 1, for example, by gluing it to the inner bottom end surface; as a detachable structure, the bottom end of the membrane bag 11 can also be firmly wedged by a sealing ring 12 lined on the side edge of the inner bottom end of the membrane bag 11. Into the inner bottom end side edge of the medicine liquid container 1. In addition, a liquid outlet is required at the cone tip of the membrane bag 11, and the liquid outlet is connected to the outlet end of the medicine liquid container 1. In this way, it can be completely avoided that the supplementary liquid passes through the membrane bag 11 and the inner wall of the medicine liquid container 1 and flows to the outlet end of the medicine liquid container 1 and flows out by mistake in some accidental circumstances. The membrane bag 11 can be squeezed out of the membrane bag 11 as thoroughly as possible under the squeeze of the supplementary liquid, and then fully flows out through the outlet end of the medicine liquid container 1. This structural design is an optimal implementation structure.

[0035] In addition, in this embodiment, when the supplementary liquid is not the delivered liquid medicine, it may not be a liquid, that is, Figure 3A vertically sliding sliding partition 13 is arranged in the medicine liquid container 1. The density of the sliding partition 13 is the same as that of the medicine liquid, or the density difference between the two is within a set range. The sliding partition 13 completely separates the replenishing liquid from the medicine liquid up and down, so that the replenishing liquid and the medicine liquid are not mixed, and the replenishing liquid is prevented from flowing out of the outlet end of the medicine liquid container 1. However, this design has high requirements on the material of the sliding partition 13 and the seamless sliding fit with the inner wall of the container. It is not the best implementation method and is only adopted by technicians in this field when it meets the current manufacturing and use status.

[0036] Based on the above series of embodiments of the method for constant delivery of liquid medicine, as a more specific embodiment, a corresponding device is made, that is, this embodiment introduces a liquid medicine constant infusion device, the structure of which is as follows: Figure 1 As shown, the main components include, in addition to the medicine liquid container 1 and the delivery pipe 9 in the above embodiments, a valve is installed on the delivery pipe 9, and the output end of the delivery pipe 9 is connected to a corresponding infusion element. For example, during enema, the connected infusion element is a rectal cannula, and during intravenous infusion or drug injection, an indwelling needle or a syringe is connected. During specific production, the medicine liquid constant infusion device also includes two storage dishes for accommodating supplementary liquid, that is, components for realizing continuous replenishment of the medicine liquid container 1 with supplementary liquid. During operation, the first storage dish 7 can be used to put a certain amount of supplementary liquid into the second storage dish 3 to ensure that once the medicine liquid container 1 starts to output the medicine liquid, there is enough supplementary liquid to flow into the medicine liquid container 1 in time, and then the valve on the delivery pipe 9 is opened to transport the medicine liquid. In practice, the installation positions of the first storage dish 7 and the second storage dish 3 of the two storage dishes are as follows: Figure 1 As shown, the first storage dish 7, the medicine liquid container 1, and the second storage dish 3 are arranged in sequence from top to bottom, wherein the bottom of the first storage dish 7 is connected to the bottom of the second storage dish 3, and the second storage dish 3 is connected to the top of the medicine liquid container 1. Such a design is sufficient to ensure that when the first storage dish 7 continuously replenishes the supplementary liquid into the medicine liquid container 1 through the second storage dish 3, the medicine liquid container 1 can always have the same amount of liquid as the volume of medicine liquid corresponding to the initial moment. For example, the medicine liquid container 1 can be always full of liquid.

[0037] Continue reading Figure 1 As a specific implementation structure, a floating plate 6 that can float on the replenishing liquid is provided in each of the two storage vessels. The floating plate 6 can float on the liquid surface of the replenishing liquid and can smoothly contact with the inner wall of the storage vessel. However, it is better to be smaller than the cross section of the storage vessel to avoid contact with the inner wall of the storage vessel, because in this way the floating plate 6 can better rise freely with the liquid surface. A lightweight guide rod with axial scale lines is vertically fixed on each floating plate 6. The guide rod is made of low-density material and is hollow when necessary. Each guide rod vertically slides through the top wall of the corresponding storage vessel. Figure 4-5The scale lines on the first guide rod 5 in the first storage container 7 of the two guide rods increase from bottom to top, while the scale lines on the second guide rod 8 in the second storage container 3 decrease from bottom to top, and in the initial state, the zero scale lines of the two guide rods just expose the top surface of the corresponding storage container, so as to directly read the vertical displacement of each floating plate 6. In addition, more specifically, the diameters of the two storage containers in this embodiment are the same, and a contact switch (not shown in the figure) with adjustable installation height is provided just above the guide rod on the top of each storage container, and the contact switch controls the opening and closing of the conveying pipeline 9. When in use, if the guide rod in the second storage dish 3 moves up to the position in contact with the contact switch, or reaches the set vertical spacing distance from the contact switch, the contact switch will be immediately closed to stop the liquid output in the liquid medicine container 1, and then automatically and accurately obtain the predetermined amount of liquid medicine infusion; this is because the two storage dishes have the same diameter, so the height value of the guide rod of the second storage dish 3 moving up actually indirectly represents that the liquid medicine container 1 is filled with the supplementary liquid, that is, the liquid medicine has been output. As a more popular explanation: assuming that the liquid medicine container 1 is filled with liquid, the volume corresponding to the liquid 15mm high in the storage dish If the liquid level in the first storage dish 7 drops by 20 mm, and the amount of supplementary liquid to be flowed into the liquid medicine container 1 reaches the level of filling the liquid medicine container 1, the liquid level in the second storage dish 3 should rise by 20-15=5 mm. As long as the guide rod on the second storage dish 3 rises by 5 mm and contacts the contact switch at the corresponding height at this time, the delivery pipeline 9 is automatically closed immediately to stop the output of the liquid medicine. The structure of this embodiment is simple and easy to understand and manufacture. Even ordinary medical staff can clearly grasp its working principle, and the measurement is very accurate. Of course, a more intelligent approach can also be adopted. For example, a displacement sensor 10 and a calculation module are provided on one side of the top of each storage dish. Specifically, the displacement sensor 10 is used to detect the vertical displacement of each guide rod to indirectly represent the change in the liquid level in each storage dish, and the calculation module is specifically used to calculate the volume difference between the replenishing liquid flowing out of the first storage dish 7 and the existing replenishing liquid in the second storage dish 3. In practice, this volume difference is equal to the cross-sectional area of ​​the inner cavity of the storage dish multiplied by the difference in displacement detected by the two displacement sensors 10. This structure is also simple to calculate and easy to understand. Compared with traditional flow meters or flow rate sensors, it does not require professional knowledge to master the specific calculation principles. However, compared with the simplified and reliable design of the contact switch combined with the guide rod mentioned in this article, it is undoubtedly more complicated, but it can be applied to devices that tend to be smart medical devices, so as to facilitate the integration of the corresponding calculation module into some smart devices. However, for ordinary clinical medical care, it is still recommended to use the simple operation mode of the guide rod combined with the contact switch.

[0038] In all the above embodiments, in order to fully maintain the overflow state in the liquid medicine container 1 as much as possible, the connecting pipe 4 between the two storage vessels must be filled with liquid in advance. This part of the liquid is not within the volume range of the first storage vessel 7, which will have a certain impact on the calculation of the volume difference. In order to eliminate this impact, Figure 1 As shown, a concave liquid storage tank 2 is intentionally provided on one side of the inner bottom surface of the second storage dish 3, and the outlet end of the connecting pipe 4 is connected to the liquid storage tank 2, and the volume of the liquid storage tank 2 is equal to the internal volume of the connecting pipe 4, so that once the valves at both ends of the connecting pipe 4 (the valve at the other end is not shown in the figure) are opened, the supplementary liquid retained in the connecting pipe 4 will first enter the liquid storage tank 2, just filling up the liquid storage tank 2, and then the supplementary liquid in the first storage dish 7 will flow into the second storage dish 3, and then start to lift the corresponding floating plate 6, and only then will the guide rod begin to produce displacement, which is very accurate. As for the pipeline between the second storage dish 3 and the liquid medicine container 1, since they are connected up and down, they can be connected as shown in the figure. Figure 1 As shown in the figure, the pipeline is very short, or even the pipeline is directly eliminated, so that the bottom of the second storage dish 3 is in contact with the top surface of the liquid medicine container 1, or even integrally formed, the influence of liquid accumulation in the pipeline can be eliminated, so there is no need to consider the influence of internal retained liquid like the connecting pipeline 4.

[0039] The present invention is not limited to the field involved in this implementation case. Some well-known structures or principles are not further described. However, ordinary technicians in the relevant field can theoretically know all the known technologies in this technical field before the application date or priority date, can fully master all the existing technologies in this technical field, and have the means and ability to apply these existing technologies for actual design and application. Under the technical inspiration given by this application, technicians can improve and implement the present invention more comprehensively based on their own abilities.

[0040] In addition, it should be pointed out that although the text and graphics of the above embodiments have shown the specific implementation scenarios of the present invention, for those skilled in the art, it is entirely possible to make a variety of obvious expansions and extensions to these embodiments without departing from the design concept of the present invention to form different embodiments, but this does not affect the scope of protection of the present invention, which is covered and embodied by the technical features of the claims and equivalent technical features.

Claims

1. A method for constant delivery of liquid medicine, comprising arranging the outlet end of a liquid medicine container (1) downward so that the liquid medicine is delivered downward through at least one delivery pipe (9) connected to the outlet end under the action of its own gravity, characterized in that: During the process of delivering the medicine liquid, a supplementary liquid is continuously injected into the medicine liquid container (1), wherein the density of the supplementary liquid is the same as the density of the medicine liquid, or the density difference between the two is within a set range; the principle of delivering the supplementary liquid is that, during the entire process of delivering the medicine liquid, the medicine liquid container (1) always contains a liquid volume corresponding to the volume of the medicine liquid at the initial moment, so as to ensure that the liquid pressure at the outlet end is always maintained within a set range.

2. A method for constant delivery of liquid medicine according to claim 1, characterized in that: An overflow hole is provided at the top of the medicine liquid container (1). When replenishing liquid into the medicine liquid container (1), the flow rate of the replenishing liquid must be such that liquid in the medicine liquid container (1) always overflows from the overflow hole, so as to maintain the liquid volume in the medicine liquid container (1) always equal to the corresponding medicine liquid volume at the initial moment.

3. A method for constant delivery of liquid medicine according to claim 2, characterized in that: An electromagnetic valve is installed at the outlet end of the liquid medicine container (1), and the volume of the supplementary liquid added to the liquid medicine container (1) is v1, the volume of the liquid flowing out of the overflow hole is v2, and the volume of the liquid medicine that needs to be initially transported in the liquid medicine container (1) is k; When the liquid medicine is not delivered, v1-v2=0; When the liquid medicine is being transported and v1-v2=k, the solenoid valve is immediately closed.

4. A method for constant delivery of liquid medicine according to claim 1, characterized in that: When the supplementary liquid is not the delivered medicinal liquid, the medicinal liquid is stored in a soft membrane bag (11), and the membrane bag (11) is placed in the medicinal liquid container (1). The membrane bag (11) maintains seamless contact with the inner wall of the medicinal liquid container (1) due to the filling and squeezing of the internal medicinal liquid, and the liquid outlet of the membrane bag (11) faces downward so that the medicinal liquid can flow out from the outlet end after flowing out of the membrane bag (11).

5. A method for constant delivery of liquid medicine according to claim 1, characterized in that: When the replenishing liquid is not the delivered medicinal liquid, a vertically sliding partition (13) is provided in the medicinal liquid container (1). The density of the sliding partition (13) is the same as that of the medicinal liquid, or the density difference between the two is within the set range. The sliding partition (13) completely separates the replenishing liquid from the medicinal liquid in the upper and lower parts.

6. A device for constant infusion of liquid medicine, characterized in that: It comprises the medicine liquid container (1) as claimed in claim 1, a delivery pipe (9), and two storage dishes for containing the replenishing liquid, wherein the delivery pipe (9) is provided with a switch valve, and the first storage dish (7), the medicine liquid container (1), and the second storage dish (3) are arranged in sequence from top to bottom, wherein the bottom of the first storage dish (7) is connected to the bottom of the second storage dish (3), and the second storage dish (3) is connected to the top of the medicine liquid container (1), so that when the first storage dish (7) continuously replenishes the replenishing liquid into the medicine liquid container (1) through the second storage dish (3), the medicine liquid container (1) can always have the same amount of liquid as the volume of medicine liquid corresponding to the initial moment.

7. A liquid medicine constant infusion device according to claim 6, characterized in that: A floating plate (6) capable of floating on the replenishing liquid is provided in each of the two storage vessels. A guide rod having scale lines in the axial direction is vertically fixed on each of the floating plates (6). The guide rod vertically slides through the top wall of the storage vessel. The scale lines on the first guide rod (5) in the first storage vessel (7) increase from bottom to top, and the scale lines on the second guide rod (8) in the second storage vessel (3) decrease from bottom to top. In the initial state, the zero scale lines of the two guide rods just expose the top surface of the corresponding storage vessel.

8. A liquid medicine constant infusion device according to claim 7, characterized in that: The two storage vessels have the same diameter. A contact switch with an adjustable installation height is provided above the guide rod on the top of each storage vessel. The contact switch controls the opening and closing of the conveying pipeline (9). When the guide rod moves up to contact the contact switch or has a set distance, the contact switch is immediately closed.

9. A liquid medicine constant infusion device according to claim 6, characterized in that: A recessed liquid storage tank (2) is provided on one side of the inner bottom surface of the second storage vessel (3); the outlet end of the connecting pipe (4) between the two storage vessels is connected to the liquid storage tank (2), and the volume of the liquid storage tank (2) is equal to the internal volume of the connecting pipe (4).

10. A liquid medicine constant infusion device according to claim 6, characterized in that: The inner bottom end of the medicine liquid container (1) is a funnel-shaped structure, and the medicine liquid container (1) also has a built-in soft membrane bag (11) for containing medicine liquid, the membrane bag (11) is a cylindrical bag-shaped structure with a conical bottom end, and the bottom end of the membrane bag (11) is coaxially fixedly attached to the inner bottom end of the medicine liquid container (1), and is firmly wedged into the inner bottom end side edge of the medicine liquid container (1) by a sealing ring (12) lined on the inner bottom end side edge of the membrane bag (11); a liquid outlet is provided at the cone tip of the membrane bag (11), and the liquid outlet is connected to the outlet end of the medicine liquid container (1).

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