A liquid-gas joint control infusion device with automatic bottle replacement in sequence

Abstract

The present invention discloses a liquid-gas jointly controlled sequential automatic bottle-changing infusion set, which includes a first flow channel, a rear flow channel, and a liquid-gas joint controller arranged between the first flow channel and the rear flow channel. The first flow channel is connected to a first medicine bottle and an intravenous injection needle. The upper end of the rear flow channel is connected to a medicine bottle at the rear, and the lower end is connected to the first flow channel below the liquid-gas joint controller after passing through the liquid-gas joint controller. The liquid-gas joint controller is provided with an air inlet channel, and the air inlet channel bifurcates in the liquid-gas joint controller to form a prior airway and a rear airway leading to the outside of the liquid-gas joint controller. The prior airway is connected to a prior medicine bottle, and the rear airway is connected to a medicine bottle at the rear. When the liquid-gas joint controller opens the rear flow channel, the prior airway is synchronously closed, and all prior medicine bottles stop admitting air, so that the remaining liquid medicine in all prior medicine bottles is forced to stop flowing downward. Its advantages are as follows: it can realize simultaneous hanging of multiple medicine bottles and sequential automatic bottle-changing drip infusion; it can avoid excessive mixing of the liquid medicine in the rear medicine bottle with the residual liquid medicine in the prior medicine bottle during the drip infusion.

Description

Technical Field

[0001] The present invention relates to a liquid-gas controlled sequential automatic bottle-changing infusion set, belonging to the technical field of medical devices. Background Art

[0002] The ordinary infusion sets used in the prior art have only one infusion channel. When there are many infusion bottles, medical staff often need to manually insert the infusion set into the next infusion bottle to change the bottle when the liquid medicine in the previous infusion bottle is finished. Since the time period for bottle-changing work is not long, and it depends on manual monitoring of the infusion condition and the timing of bottle-changing to remind medical staff to change the bottle. Especially when the number of patients is large and scattered, the frequent bottle-changing work makes medical staff very busy and under great work pressure, leaving them with no time to take care of the infusion condition and the timing of bottle-changing. Patients or their families often need to observe the infusion condition and the timing of bottle-changing. However, patients or their families often fail to prompt medical staff to change the bottle in a timely manner due to inattentiveness. Or even if patients or their families prompt, but due to the busyness of medical staff, they cannot change the bottle in a timely manner. Often, the infusion work is delayed due to the untimely bottle-changing by medical staff, and the task of bottle-changing is increased due to the excessive drop of the liquid medicine, making the infusion work more complex and onerous. Currently, the industry has begun to use intelligent monitoring and control technologies to solve the above problems. However, due to the complex structure and high cost of the intelligent automatic bottle-changing infusion system, the disposable use cost is too high, making it difficult to popularize in the infusion of ordinary patients.

[0003] In the face of the above problems, the industry has developed a number of automatic bottle-changing technologies that do not rely on electronic intelligent control technologies. However, there are generally problems such as excessive mixing of the liquid medicine in the previous bottle and the liquid medicine in the subsequent bottle due to unreliable control, and the improved part being too large in volume. Since the liquid medicines in different bottles have different components, they are not suitable for large-scale mixed injection. Otherwise, there is no need to inject in sequence by separating bottles. However, in actual operation, when the liquid medicine in the previous bottle is finished dropping and then the liquid medicine in the subsequent bottle is continued, the liquid medicine in the subsequent bottle and the liquid medicine in the previous bottle enter the same infusion tube. There is no separation between the liquid medicine in the subsequent bottle above and the liquid medicine in the previous bottle below in the infusion tube. This is because the aperture of the infusion tube and the aperture of the Murphy's dropper are both small, and the contact amount between the upper and lower liquid medicines is extremely small, and the amount of mixing is also very small, so it is within the allowable range.

[0004] Next, taking the technical solution disclosed in the invention patent document with the application number 201410805338.4 as an example, we will illustrate the cause of the defect that excessive mixing of the liquid medicine in the previous bottle and the liquid medicine in the subsequent bottle will occur during the actual use process.

[0005] This patent document discloses a differential pressure type automatic bottle-changing infusion set. It connects the middle and lower ends of two or more infusion channels in parallel. By adjusting the hanging heights of each infusion bottle or can, or making the part or all of the infusion channels with later infusion order in an emptied state, or maintaining the pressures in each infusion bottle or can within a certain range or at a constant level from high to low according to the infusion order, the pressure in the infusion channel with earlier infusion order is always greater than that in the infusion channel with later infusion order before the former is emptied, thus maintaining a certain pressure difference. The infusion set automatically determines the bottle-changing order and timing according to the pressure difference between each infusion channel and the state of the control valve to complete the automatic order bottle-changing infusion work.

[0006] For the convenience of description and understanding, the names are supplemented and the numbers are re-assigned to the drawings corresponding to the embodiments of this solution in this article.

[0007] Embodiment 1 in this solution:

[0008] As Figure 11 shown, the liquid level height of the liquid medicine in the first medicine bottle 1 is lower than that in the second medicine bottle 2. The lower end of the upper infusion tube 104 of the first medicine bottle 1 intersects and communicates with the lower end of the upper infusion tube 204 of the second medicine bottle 2. During the dripping process, when the liquid level heights of the liquid medicine in the first medicine bottle 1 and the second medicine bottle 2 are equal, the liquid medicine pressures at the lower ends of the upper infusion tube 104 of the first medicine bottle 1 and the upper infusion tube 204 of the second medicine bottle 2 are equal. The liquid medicine in the second medicine bottle 2 will inevitably start to flow downward together with the remaining liquid medicine in the first medicine bottle 1 and mix in the common infusion tube 8, resulting in all the remaining liquid medicine in the first medicine bottle 1 mixing with the liquid medicine in the second medicine bottle in an unacceptable excessive amount. In fact, the liquid medicine in the first medicine bottle 1 does not necessarily wait until the liquid level heights of the liquid medicine in the first medicine bottle 1 and the second medicine bottle 2 are completely equal before the liquid medicine in the second medicine bottle 2 starts to flow. Instead, the liquid medicine in the second medicine bottle 2 will start to flow when the liquid level of the liquid medicine in the first medicine bottle is still higher than that in the second medicine bottle, which will cause more liquid medicine in the first medicine bottle 1 to mix with the liquid medicine in the second bottle.

[0009] Embodiment 2 in this solution:

[0010] As Figure 12 shown, the liquid medicine in the first medicine bottle 1 exists in the valve cavity 205 and the valve cavity 304. The liquid medicines in the second medicine bottle 2 and the third medicine bottle 3 will mix with the liquid medicine in the first medicine bottle 1 in the valve cavity 205 and the valve cavity 304 respectively.

[0011] The gases entering the first medicine bottle 1 and the second medicine bottle 2 are not closed during the dripping of the third medicine bottle 3. The remaining liquid medicines in the first medicine bottle 1 and the second medicine bottle 2 will all flow downward and mix with the liquid medicine in the third medicine bottle 3, and there is a risk that the gas will enter the Murphy's dropper 6, causing the Murphy's dropper 6 to lose pressure.

[0012] In summary, the technical solution disclosed in this invention patent has the defect of excessive mixing of multiple bottles of medicine in the front and back. In addition, the air inlet channel of the medicine bottle that has completed the instillation in the front is not closed, and there is a risk of gas entering the Moffitt dropper 6, causing the Moffitt dropper 6 to lose pressure. Summary of the invention

[0013] The technical problem to be solved by the present invention is: how to automatically change bottles and drip multiple bottles of liquid medicine in sequence and ensure that the liquid medicine in the rear bottle does not form excessive mixing with the liquid medicine in the front bottle.

[0014] In view of the above problems, the technical solution proposed by the present invention is:

[0015] A liquid-gas controlled sequential automatic bottle-changing infusion device comprises a first flow channel, a subsequent flow channel and a liquid-gas control device arranged between the first flow channel and the subsequent flow channel, wherein the first flow channel connects a first medicine bottle with an intravenous injection needle, the upper end of the subsequent flow channel connects to the subsequent medicine bottle, and the lower end passes through the liquid-gas control device and is connected to the first flow channel below the liquid-gas control device, the liquid-gas control device is provided with an air inlet, the air inlet is bifurcated in the liquid-gas control device to form a preceding air channel and a subsequent air channel leading to the outside of the liquid-gas control device, the preceding air channel connects to the first medicine bottle, and the subsequent air channel connects to the subsequent medicine bottle, when the liquid-gas control device opens the subsequent flow channel, the preceding air channel is synchronously closed, the first medicine bottle stops taking in air, and the remaining liquid in the first medicine bottle is forced to stop flowing downward.

[0016] The liquid-gas joint controller has a main hydraulic chamber connected with the first flow channel on the left side, and a secondary hydraulic chamber connected with the rear flow channel on the right side. A cylinder liner body is provided between the main hydraulic chamber and the secondary hydraulic chamber. The air inlet is provided on the lower side of the cylinder liner body to enter the cylinder liner body, and is branched in the cylinder liner body to form the preceding air channel and the following air channel leading to the outside of the upper side of the cylinder liner body. A cylinder liner hole is provided in the cylinder liner body. A joint control piston valve is provided in the cylinder liner hole, and the left end is subjected to the axial pressure of the main hydraulic chamber, and the right end is subjected to the axial pressure of the secondary hydraulic chamber. The valve can simultaneously control the opening and closing of the following flow channel and the preceding air channel. When the axial pressure of the main hydraulic chamber is greater than the axial pressure of the secondary hydraulic chamber, the joint control piston valve slides toward the secondary hydraulic chamber to close the following flow channel. When the pressure of the main hydraulic chamber is less than the pressure of the secondary hydraulic chamber, the joint control piston valve slides toward the main hydraulic chamber to open the following flow channel and close the preceding air channel.

[0017] The joint control piston valve is composed of a rigidly connected hydraulic piston valve and an air valve. The hydraulic piston valve is located in the cylinder sleeve hole, and the left and right ends of the hydraulic piston valve bear the liquid pressure of the main hydraulic chamber and the secondary hydraulic chamber respectively.

[0018] The right side wall of the secondary hydraulic cavity is provided with a conical liquid outlet hole communicating with the upper section of the rear flow channel, and a hole 1 communicating with the lower section of the rear flow channel is opened on the bottom wall of the secondary hydraulic cavity. The right end of the hydraulic piston valve is a conical end capable of blocking the liquid outlet hole. The main hydraulic cavity and the secondary hydraulic cavity are cylindrical cavities, and the cross-sectional area of the main hydraulic cavity is larger than that of the secondary hydraulic cavity. A circular piston plate fixed to the hydraulic piston valve on the right side is arranged in the main hydraulic cavity. The left side of the piston plate bears hydraulic pressure, and the cross-sectional area of the piston plate is larger than the cross-sectional area of the right end of the hydraulic piston valve.

[0019] The cross-sectional area of the piston plate is 15 - 40 times larger than the cross-sectional area of the right end of the hydraulic piston valve.

[0020] An elastic left sealing film is arranged in the main hydraulic cavity. The liquid in the main hydraulic cavity is located on the left side of the left sealing film, and the piston plate is located on the right side of the left sealing film. An elastic right sealing film is arranged at the right end of the secondary hydraulic cavity. The liquid in the secondary hydraulic cavity is located on the right side of the right sealing film. The right end of the hydraulic piston valve is located on the left side of the right sealing film. The left sealing film and the right sealing film prevent the liquid from entering the cylinder liner body, and enable the gas output from the prior airway and the rear airway to only enter from the intake airway.

[0021] An expanded annular air cavity is arranged on the inner wall of the middle part of the cylinder liner hole. An intake hole communicating with the outside is arranged on the bottom wall of the annular air cavity. The intake hole and the annular air cavity form an intake airway. The rear airway is an air outlet hole arranged on the top wall of the annular air cavity. The prior airway has a conical intake hole arranged on the left side wall of the annular air cavity. The air valve is arranged coaxially with the intake hole in the annular air cavity on the left side of the intake hole. The air valve is fixedly connected with the hydraulic piston valve through a connecting piece. When the hydraulic piston valve slides towards the main hydraulic cavity to open the rear flow channel, the air valve blocks the intake hole.

[0022] The rear flow channel includes a flexible confluence pipe communicating with the first flow channel at the lower section. The upper end of the confluence pipe communicates with the hole 1 opened on the bottom wall of the secondary hydraulic cavity. A current-limiting clamp for temporarily clamping the confluence pipe 3 to prevent the liquid medicine from flowing is arranged at the connection with the first flow channel.

[0023] The main hydraulic cavity has a main hydraulic cavity body. The right side of the main hydraulic cavity body is open. The left end of the cylinder liner body is a disc-shaped body. The right side of the main hydraulic cavity body is hermetically assembled with the disc-shaped body at the left end of the cylinder liner body. The secondary hydraulic cavity has a secondary hydraulic cavity body. The left side of the secondary hydraulic cavity body is open. The left side of the secondary hydraulic cavity body is hermetically assembled with the right end of the cylinder liner body. The cylinder liner body is divided into a left end sleeve body and a right end sleeve body assembled in a sealed manner. The annular air cavity is arranged in the left end sleeve body and has an opening at the right end of the left end sleeve body.

[0024] The described liquid-gas jointly controlled sequential automatic bottle-changing infusion device includes a plurality of liquid-gas controllers. The plurality of liquid-gas controllers are sequentially assembled in series downward along the first flow channel, and the prior airway of the lower liquid-gas controller is communicated with the intake airway of the upper liquid-gas controller. Beneficial effects

[0025] 1. It can realize the sequential automatic bottle changing and drip infusion of multiple medicine bottles on the hanging rack simultaneously;

[0026] 2. It can avoid excessive mixing of the liquid medicine being dripped from the subsequent medicine bottle with the residual liquid medicine in the previous medicine bottle;

[0027] 3. It can prevent gas from entering the Murphy's dropper through the air duct of the previous medicine bottle, causing pressure loss in the Murphy's dropper;

[0028] 4. The actual volume of the main component of the bottle-changing infusion set, the liquid-gas control device, is only as small as the size of a small bottle cap, and the production material cost is not high, making it suitable for mass production and single-use. Description of the Drawings

[0029] Figure 1 It is a plan view of an automatic bottle-changing infusion set used for two medicine bottles in Example 1;

[0030] Figure 2 For Figure 1 partial schematic view;

[0031] Figure 3 For Figure 1 partial schematic view, mainly showing the liquid-gas control device part in the figure;

[0032] Figure 4 It is a cross-sectional schematic view of the liquid-gas control device described in Example 1, showing that the subsequent flow channel is closed and the liquid medicine of the previous medicine bottle in the first flow channel is flowing downward in sequence;

[0033] Figure 5 For Figure 4 partial schematic view;

[0034] Figure 6 It is a three-dimensional schematic view of the control piston valve in Example 1;

[0035] Figure 7 It is a cross-sectional schematic view of the liquid-gas control device described in Example 1, showing that the subsequent flow channel is opened, the previous air duct is closed, and the residual liquid medicine of the previous medicine bottle in the first flow channel stops flowing downward;

[0036] Figure 8 It is a disassembled schematic view of the liquid-gas control device described in Example 1;

[0037] Figure 9 It is a plan view of an automatic bottle-changing infusion set used for multiple 4 medicine bottles in Example 2;

[0038] Figure 10 For Figure 9 partial schematic view.

[0039] Figure 11 It is a cross-sectional schematic view of Example 1 of the prior art;

[0040] Figure 12 It is a schematic cross-sectional view of the second embodiment of the prior art.

[0041] In the figure: 1, the first medicine bottle; 100, the first flow channel; 101, the first bottle infusion hose; 102, the first bottle air inlet hose; 103, the first double-hole needle; 104, the upper infusion pipe one; 2, the second medicine bottle; 201, the second bottle infusion hose; 202, the second bottle air inlet hose; 203, the second double-hole needle; 204, the upper infusion pipe two; 205, the valve cavity two; 3, the third medicine bottle; 301, the third bottle infusion hose; 302, the third bottle air inlet hose; 303, the third double-hole needle; 304, the valve cavity three; 4, the fourth medicine bottle; 401, the fourth bottle infusion hose; 402, the fourth bottle air inlet hose; 403, the fourth double-hole needle; 5, the liquid-gas control device; 51, the main hydraulic cavity body; 511, the main hydraulic cavity; 5111, the left sealing film; 52, the secondary hydraulic cavity body; 521, the secondary hydraulic cavity; 5211, the right sealing film; 53, the cylinder sleeve body; 531, the cylinder sleeve hole; 532, the disc-shaped body; 533, the left end sleeve body; 534, the right end sleeve body; 54, the control piston valve; 541, the hydraulic piston valve; 5411, the piston plate; 5412, the conical end; 542, the air valve; 55, the rear flow channel; 551, the liquid outlet hole; 552, the hole one; 553, the confluence pipe; 56, the air inlet channel; 561, the air inlet hole; 562, the annular air cavity; 57, the prior air channel; 571, the air inlet hole; 58, the rear air channel; 59, the flow-limiting clamp; 6, the Murphy's dropper; 7, the intravenous injection needle; 8, the common infusion pipe. Specific embodiments

[0042] For the convenience of description and more intuitive understanding of the present invention, the "left" and "right" orientation terms used in this article only represent the orientation shown in the views of this application and do not limit the orientation in actual application.

[0043] The following further describes the present invention with reference to the accompanying drawings:

[0044] Embodiment 1

[0045] As Figure 1As shown in Fig. 4, a liquid-gas jointly controlled sequential automatic bottle-changing infusion set includes a first flow channel 100, a rear flow channel 55, and a liquid-gas joint controller 5 provided between the first flow channel 100 and the rear flow channel 55. The first flow channel 100 is connected to the first medicine bottle 1 and the intravenous injection needle 7. The upper end of the rear flow channel 55 is connected to the subsequent medicine bottle, and the lower end is connected to the first flow channel 100 below the liquid-gas joint controller 5 after passing through the liquid-gas joint controller 5. The liquid-gas joint controller 5 is provided with an air inlet channel 56, and the air inlet channel 56 bifurcates inside the liquid-gas joint controller 5 to form a prior air channel 57 and a subsequent air channel 58 leading to the outside of the liquid-gas joint controller 5. The prior air channel 57 is connected to the first medicine bottle 1, and the subsequent air channel 58 is connected to the subsequent medicine bottle. When the liquid-gas joint controller 5 opens the rear flow channel 55, the prior air channel 57 is synchronously closed, and the first medicine bottle 1 stops admitting air, causing the remaining liquid medicine in the first medicine bottle 1 to be forced to stop flowing downward. When only one liquid-gas joint controller 5 is used in the bottle-changing infusion set, it can control the automatic bottle-changing of two medicine bottles during infusion. When the first medicine bottle 1 infuses liquid medicine into the human body through the first flow channel 100, the liquid-gas joint controller 5 closes the rear flow channel 55, and gas enters the first medicine bottle 1 through the air inlet channel 56, the prior air channel 57, and the first bottle air inlet hose 102 to provide normal atmospheric pressure inside the first medicine bottle 1, so that the liquid medicine in the first medicine bottle 1 can flow downward. When the liquid medicine in the first medicine bottle 1 is completely infused, the liquid-gas joint controller 5 starts the infusion of the liquid medicine in the second medicine bottle 2 and simultaneously closes the prior air channel 57, so that gas cannot enter the first medicine bottle 1, causing the residual liquid medicine in the first medicine bottle 1 to form a negative pressure due to gravity in the first medicine bottle 1, thereby being able to prevent the residual liquid medicine in the first medicine bottle 1 and the upper section of the first bottle infusion hose 101 in the first flow channel 100 from flowing downward and avoid mixing with the liquid medicine in the second medicine bottle 2 that is being infused. At the same time, it can also prevent gas from entering the Murphy's dropper 6 through the prior flow channel, the first medicine bottle 1, and the first bottle infusion hose 101, causing the Murphy's dropper 6 to lose pressure.

[0046] It should be noted here that the rear flow channel 55 is opposite to the first flow channel 100 of the first medicine bottle 1. The rear flow channel 55 includes the liquid medicine output flow channels of the second medicine bottle 2, the third medicine bottle 3, and subsequent medicine bottles except the first medicine bottle 1. From the following text and the attached drawings Figure 1 、 3 、9, and 10, it can be seen that the liquid medicine output flow channels of the second medicine bottle 2, the third medicine bottle 3, and subsequent medicine bottles for sequential infusion will be sequentially connected to the first flow channel 100 downward. That is, the lower end of the output flow channel of any subsequent medicine bottle is directly connected to the first flow channel 100 through the confluence pipe 553, rather than being connected to the output flow channel of the previous medicine bottle. Therefore, the liquid medicine output flow channels of the second medicine bottle 2, the third medicine bottle 3, and subsequent medicine bottles except the first medicine bottle 1 are defined as the rear flow channel 55 relative to the first flow channel 100. The middle section of the rear flow channel 55 passes through the secondary hydraulic cavity 52 of the liquid-gas joint controller 5.

[0047] In this embodiment, only an example of using one liquid-gas control unit 5 to control two medicine bottles is taken to illustrate the specific structure and working principle of the automatic bottle-changing infusion device.

[0048] As Figure 1 —3 shows, the liquid output flow path of the first medicine bottle 1 is the first flow path 100. The upper section of the first flow path 100 is the first bottle infusion hose 101, and the upper end of the first bottle infusion hose 101 is the double-hole needle one 103 with liquid outlet and air inlet functions inserted into the first medicine bottle 1. There is a first bottle air inlet hose 102 between the double-hole needle one 103 and the prior airway 57 of the liquid-gas control unit 5.

[0049] The liquid output flow path of the second medicine bottle 2 is the subsequent flow path 55 relative to the first flow path 100, including: the double-hole needle two 203 with liquid outlet and air inlet functions inserted into the second medicine bottle 2 at the upper end, the second bottle infusion hose 201 below the double-hole needle two 203, a section located in the secondary hydraulic cavity 52, and the confluence pipe 553 below the secondary hydraulic cavity 52. There is a second bottle air inlet hose 202 between the double-hole needle one 103 and the prior airway 57 of the liquid-gas control unit 5.

[0050] As Figure 4As shown in FIGS. 6-7, the left side of the liquid-gas control valve 5 has a main hydraulic chamber 511 communicating with the first flow channel 100, and the right side has a secondary hydraulic chamber 521 communicating with the subsequent flow channel 55. Between the main hydraulic chamber 511 and the secondary hydraulic chamber 521 is a cylinder sleeve body 53. The intake air passage 56 is provided with an intake air port below the cylinder sleeve body 53 that enters the cylinder sleeve body 53 and bifurcates inside the cylinder sleeve body 53 to form a prior air passage 57 and a subsequent air passage 58 leading to the outside above the cylinder sleeve body 53. Inside the cylinder sleeve body 53 is a cylinder sleeve hole 531. Inside the cylinder sleeve hole 531 is a control piston valve 54 that can simultaneously control the opening and closing of the subsequent flow channel 55 and the prior air passage 57, with its left end subject to the axial pressure of the main hydraulic chamber 511 and its right end subject to the axial pressure of the secondary hydraulic chamber 521. When the axial pressure received by the main hydraulic chamber 511 is greater than the axial pressure received by the secondary hydraulic chamber 521, the control piston valve 54 slides towards the secondary hydraulic chamber 521 to close the subsequent flow channel 55. When the pressure received by the main hydraulic chamber 511 is less than the pressure received by the secondary hydraulic chamber 521, the control piston valve 54 slides towards the main hydraulic chamber 511 to open the subsequent flow channel 55 and close the prior air passage 57. The control piston valve 54 is composed of a hydraulically connected hydraulic piston valve 541 and a gas valve 542. The hydraulic piston valve 541 is located inside the cylinder sleeve hole 531, and the left and right ends of the hydraulic piston valve 541 respectively bear the liquid pressure of the liquid medicine in the main hydraulic chamber 511 and the secondary hydraulic chamber 521. Specifically: on the right side wall of the secondary hydraulic chamber 521 is provided a conical liquid outlet hole 551 communicating with the upper section of the subsequent flow channel 55, and on the bottom wall of the secondary hydraulic chamber 521 is opened a hole 552 communicating with the lower section of the subsequent flow channel 55. The right end of the hydraulic piston valve 541 is a conical end 5412 that can block the liquid outlet hole 551. The main hydraulic chamber and the secondary hydraulic chamber 521 are cylindrical cavities, and the cross-sectional area of the main hydraulic chamber is larger than the cross-sectional area of the secondary hydraulic chamber 521. Inside the main hydraulic chamber is a circular piston plate 5411 fixedly connected to the right side of the hydraulic piston valve 541. The left side of the piston plate 5411 bears the hydraulic pressure, and the cross-sectional area of the piston plate 5411 is larger than the cross-sectional area of the right end of the hydraulic piston valve 541; in the middle inner wall of the cylinder sleeve hole 531 is provided an expanded annular air chamber 562. The bottom wall of the annular air chamber 562 is provided with an air intake hole 561 leading to the outside. The air intake hole 561 and the annular air chamber 562 form the intake air passage 56. The subsequent air passage 58 is an air outlet hole provided on the top wall of the annular air chamber 562. The prior air passage 57 has a conical air intake hole 571 provided on the left side wall of the annular air chamber 562. The gas valve 542 is coaxially arranged with the air intake hole 571 inside the annular air chamber 562 on the left side of the air intake hole 571. When the hydraulic piston valve 541 slides towards the main hydraulic chamber 511 to open the subsequent flow channel 55, the gas valve 542 blocks the air intake hole 571.

[0051] The principle of the above setting is as follows: when the liquid medicine in the first medicine bottle 1 flows downward through the first bottle infusion hose 101, it enters the main hydraulic cavity 511, forming a hydraulic pressure F1 to the right on the main hydraulic cavity piston plate 5411. The hydraulic pressure of the main hydraulic cavity 511 is P1, the pressure-receiving area of the piston plate 5411 is S1, and F1 = P1·S1; the liquid medicine in the second medicine bottle 2 enters the secondary hydraulic cavity 521 through the liquid outlet hole 551 in the rear flow channel 55 via the first bottle infusion hose 101. The right end of the hydraulic piston valve 541 is subjected to a pressure F2 to the left. The hydraulic pressure of the secondary hydraulic cavity 521 is P2, and the pressure-receiving area of the right end of the hydraulic piston valve 541 is S2, so F1 = P2·S2; by increasing the pressure-receiving area S1 of the piston plate 5411 to make S1 much larger than S2, it is ensured that when the hydraulic pressure P1 of the main hydraulic cavity 511 is equal to or less than the hydraulic pressure P2 of the secondary hydraulic cavity 521, the pressure F1 to the right on the left end of the hydraulic piston valve 541 is still greater than the pressure F2 to the left on the right end of the hydraulic piston valve 541. In this way, as long as there is liquid in the main hydraulic cavity 511 and a certain pressure is maintained, the pressure F1 to the right on the left end of the hydraulic piston valve 541 can still be greater than the pressure F2 to the left on the right end of the hydraulic piston valve 541, causing the hydraulic piston valve 541 to block the liquid outlet hole 551 to the right. Only when the pressure in the main hydraulic cavity 511 drops very low or even approaches zero (the liquid in the first flow channel 100 above the main hydraulic cavity 511 is very little and the liquid level height is very low), the pressure F1 to the right on the left end of the hydraulic piston valve 541 will be less than the pressure F2 to the left on the right end of the hydraulic piston valve 541, causing the hydraulic piston valve 541 to slide to the left to open the liquid outlet hole 551, and the liquid medicine in the subsequent second medicine bottle 2 begins to flow downward for drip infusion. At the same time, the air valve 542 slides to the left with the hydraulic piston valve 541 to block the air inlet hole 571, thereby preventing the residual liquid medicine in the first bottle infusion hose 101 from flowing downward and avoiding air from entering the Murphy's dropper 6, causing the Murphy's dropper 6 to lose pressure.

[0052] Further, the cross-sectional area of the piston plate 5411 is 15 - 40 times larger than the cross-sectional area of the right end of the hydraulic piston valve 541. With such a large ratio of area difference, even if there is very little liquid medicine in the pipeline above the main hydraulic cavity 511, it can still maintain the pressure F1 to the right of the hydraulic piston valve 541 greater than the pressure F2 to the left. When the second medicine bottle 2 starts to drip, the liquid medicine in the first bottle infusion hose 101 is almost completely finished, and the waste of the liquid medicine in the first medicine bottle 1 can be minimized as much as possible.

[0053] If more than three bottles of liquid medicine are hung on the rack simultaneously for automatic bottle replacement, when the subsequent bottle of liquid medicine starts to drip, the air channels of all the previous medicine bottles are blocked, and the residual liquid medicine in all the medicine bottles will not flow downward and mix with the liquid medicine dripping from the subsequent medicine bottles, which is illustrated in Embodiment 2.

[0054] An elastic left sealing film 5111 is provided in the main hydraulic chamber 511. The liquid in the main hydraulic chamber is located on the left side of the left sealing film 5111, and the piston plate 5411 is located on the right side of the left sealing film 5111. An elastic right sealing film 5211 is provided at the right end of the secondary hydraulic chamber 521. The liquid in the secondary hydraulic chamber 521 is located on the right side of the right sealing film 5211. The right end of the hydraulic piston valve 541 is located on the left side of the right sealing film 5211. The left sealing film 5111 and the right sealing film 5211 prevent the liquid from entering the cylinder liner body 53, and the gas output from the prior airway 57 and the subsequent airway 58 can only be input from the intake airway 56. Thus, in application, the liquid in the main hydraulic chamber applies a rightward pressure to the piston plate 5411 through the left sealing film 5111, and the liquid in the secondary hydraulic chamber applies a leftward pressure to the right end of the hydraulic piston valve 541 through the right sealing film 5211. The advantage of such a setting is that it can completely prevent the liquid in the main hydraulic chamber 511 and the secondary hydraulic chamber 521 from entering the interior of the cylinder liner body, ensure the sealing of the internal airways, and prevent the liquid from entering the internal airways.

[0055] The subsequent flow channel 55 includes a flexible confluence pipe 553 whose lower section communicates with the first flow channel 100. The upper end of the confluence pipe 553 communicates with a hole 552 opened on the bottom wall of the secondary hydraulic chamber 521. A flow-limiting clamp 59 is provided at the connection with the first flow channel 100 to temporarily clamp the confluence pipe 553 to prevent the liquid medicine from flowing. In application, first open the flow-limiting clamp 59, insert the double-hole needle two 203 into the second medicine bottle 2, so that the liquid medicine of the second medicine bottle 2 to which it belongs flows down to be close to filling the subsequent flow channel 55 (at this time, there is no hydraulic pressure in the main hydraulic chamber and the subsequent flow channel is not closed), then clamp the flow-limiting clamp 59 to prevent the liquid medicine from entering the first flow channel 100. Then insert the double-hole needle one 103 into the first medicine bottle 1, so that the liquid medicine of the first medicine bottle 1 occupies the entire first flow channel 100, closes the subsequent flow channel 55, and then loosen and remove the flow-limiting clamp 59. In this way, it can not only ensure that the liquid medicine in the first medicine bottle 1 will not enter the confluence pipe 553 and the secondary hydraulic chamber 521 above, avoid mixing with the liquid medicine in the second medicine bottle 2, but also ensure that there is no air accumulation inside the confluence pipe 553.

[0056] As Figure 8 shown, for the convenience of processing and assembly of the liquid-gas control device 5, the main hydraulic chamber 511 has a main hydraulic chamber body 51. The right side of the main hydraulic chamber body 51 is open. The left end of the cylinder liner body 53 is a disc-shaped body 532. The right side of the main hydraulic chamber body 51 is hermetically assembled with the disc-shaped body 532 at the left end of the cylinder liner body 53. The secondary hydraulic chamber 521 has a secondary hydraulic chamber body 52. The left side of the secondary hydraulic chamber body 52 is open. The left side of the secondary hydraulic chamber body 52 is hermetically assembled with the right end of the cylinder liner body 53. The cylinder liner body 53 is divided into a left end sleeve body 533 and a right end sleeve body 534 that are hermetically assembled. The annular air chamber 562 is provided in the left end sleeve body 533 and has an opening at the right end of the left end sleeve body 533.

[0057] Embodiment 2

[0058] As Figure 9 , 10 shown, the difference from the first embodiment is that the automatic bottle-changing infusion device includes a plurality of liquid-gas control units 5. For each additional liquid-gas control unit 5, one more medicine bottle can be controlled. The plurality of liquid-gas control units 5 are sequentially and serially assembled downward in the first flow channel 100, and the prior airway 57 of the lower liquid-gas control unit 5 is communicated with the air inlet channel 56 of the upper liquid-gas control unit 5.

[0059] When assembling two liquid-gas control units 5 to control the automatic bottle-changing of three medicine bottles in sequence, the liquid output flow channel of the third medicine bottle 3 is the subsequent flow channel 55 relative to the first flow channel 100, including: a double-hole needle three 303 with liquid outlet and air inlet functions that is inserted into the third medicine bottle 3 at the upper end, a third bottle infusion hose 301 below the double-hole needle three 303, a section located in the secondary hydraulic cavity 52 of the second liquid-gas control unit 5, and a confluence pipe 553 below the secondary hydraulic cavity 52. There is a third bottle air inlet hose 302 between the double-hole needle one 103 and the prior airway 57 of the second liquid-gas control unit 5. When the liquid medicine in the second medicine bottle 2 is nearly finished, the pressure F1 applied to the left end of the hydraulic piston valve 541 by the main hydraulic cavity 511 of the second liquid-gas control unit 5 is less than the pressure F2 received by the right end of the hydraulic piston valve 541 and directed to the left, causing the hydraulic piston valve 541 to slide leftward to open the liquid outlet hole 551, so that the liquid medicine of the subsequent third medicine bottle 3 starts to flow downward and drip. At the same time, the air valve 542 slides leftward with the hydraulic piston valve 541 to block the prior airway of the second liquid-gas control unit 5, that is, to block the air inlet channel 56 of the upper first liquid-gas control unit, thereby preventing the residual liquid medicine in the first bottle infusion hose 101 and the second bottle infusion hose 201 from flowing downward.

[0060] When assembling three liquid-gas combined controllers 5 to control the sequential automatic bottle replacement of four medicine bottles, the liquid output flow path of the fourth medicine bottle 4 is the rear flow path 55 relative to the first flow path 100, including: a double-hole needle four 403 with the functions of liquid outlet and air inlet that is inserted into the upper end of the fourth medicine bottle 4, a fourth bottle infusion hose 401 below the double-hole needle four 403, a section located in the secondary hydraulic cavity 52 of the third liquid-gas combined controller 5, and a manifold pipe 553 below the secondary hydraulic cavity 52. There is a fourth bottle air inlet hose 402 between the double-hole needle one 103 and the prior air path 57 of the third liquid-gas combined controller 5. When the liquid in the third medicine bottle 3 is nearly used up, the pressure F1 applied to the left end of the hydraulic piston valve 541 in the main hydraulic cavity 511 of the third liquid-gas combined controller 5 is less than the pressure F2 received by the right end of the hydraulic piston valve 541 and acting to the left, causing the hydraulic piston valve 541 to slide to the left to open the liquid outlet hole 551, enabling the liquid in the subsequent fourth medicine bottle 4 to start flowing downward for drip infusion. At the same time, the air valve 542 slides to the left along with the hydraulic piston valve 541 to block the prior air path of the third liquid-gas combined controller 5, which is equivalent to blocking the air inlets 56 of the first and second liquid-gas combined controllers above, thereby preventing the residual liquid in the first bottle infusion hose 101, the second bottle infusion hose 201, and the third bottle infusion hose 301 from flowing downward.

[0061] The above embodiments are only for explaining the present invention. Without departing from the principle of the present invention, several improvements or modifications made by others should be regarded as falling within the protection scope of the present invention.

Claims

1. A liquid-gas controlled sequential automatic bottle-changing infusion set, characterized in that: It includes a first flow channel (100), a rear flow channel (55), and a liquid-gas control unit (5) provided between the first flow channel (100) and the rear flow channel (55). The first flow channel (100) connects the first medicine bottle (1) and the intravenous injection needle (7). The upper end of the rear flow channel (55) connects to the subsequent medicine bottle, and the lower end is connected to the first flow channel (100) below the liquid-gas control unit (5) after passing through the liquid-gas control unit (5). The liquid-gas control unit (5) is provided with an air inlet channel (56). The air inlet channel (56) bifurcates inside the liquid-gas control unit (5) to form a prior air channel (57) and a rear air channel (58) leading to the outside of the liquid-gas control unit (5). The prior air channel (57) connects to the first medicine bottle (1), and the rear air channel (58) connects to the subsequent medicine bottle. When the liquid-gas control unit (5) opens the rear flow channel (55), the prior air channel (57) is synchronously closed, and the first medicine bottle (1) stops admitting air, causing the remaining liquid medicine in the first medicine bottle (1) to be forced to stop flowing downward; the left side of the liquid-gas control unit (5) has a main hydraulic cavity (511) connected to the first flow channel (100), and the right side has a secondary hydraulic cavity (521) connected to the rear flow channel (55). Between the main hydraulic cavity (511) and the secondary hydraulic cavity (521) is a cylinder sleeve body (53). The air inlet channel (56) is provided below the cylinder sleeve body (53) to enter the cylinder sleeve body (53) and bifurcates inside the cylinder sleeve body (53) to form the prior air channel (57) and the rear air channel (58) leading to the outside of the upper side of the cylinder sleeve body (53). Inside the cylinder sleeve body (53) there is a cylinder sleeve hole (531). Inside the cylinder sleeve hole (531) is provided a control piston valve (54) that can simultaneously control the opening and closing of the rear flow channel (55) and the prior air channel (57), with the left end of the control piston valve (54) being axially pressured by the main hydraulic cavity (511) and the right end being axially pressured by the secondary hydraulic cavity (521). When the axial pressure received by the main hydraulic cavity (511) is greater than the axial pressure received by the secondary hydraulic cavity (521), the control piston valve (54) slides towards the secondary hydraulic cavity (521) to close the rear flow channel (55). When the pressure received by the main hydraulic cavity (511) is less than the pressure received by the secondary hydraulic cavity (521), the control piston valve (54) slides towards the main hydraulic cavity (511) to open the rear flow channel (55) and close the prior air channel (57); the control piston valve (54) is composed of a hydraulically connected hydraulic piston valve (541) and an air valve (542). The hydraulic piston valve (541) is located inside the cylinder sleeve hole (531), and the left and right ends of the hydraulic piston valve (541) respectively bear the liquid pressure of the liquid medicine in the main hydraulic cavity (511) and the secondary hydraulic cavity (521).An elastic left sealing film (5111) is provided in the main hydraulic chamber (511). The liquid in the main hydraulic chamber is located on the left side of the left sealing film (5111), and the piston plate (5411) is located on the right side of the left sealing film (5111). An elastic right sealing film (5211) is provided at the right end of the secondary hydraulic chamber. The liquid in the secondary hydraulic chamber (521) is located on the right side of the right sealing film (5211). The right end of the hydraulic piston valve (541) is located on the left side of the right sealing film (5211). The left sealing film (5111) and the right sealing film (5211) prevent the liquid from entering the cylinder liner body (53), and make the gas output from the prior airway (57) and the subsequent airway (58) can only be input from the intake airway (56).; 2. The liquid-gas jointly controlled sequential automatic bottle-changing infusion set according to claim 1, wherein: The right side wall of the secondary hydraulic chamber (521) is provided with a conical liquid outlet hole (551) connected to the upper section of the rear flow channel (55); the bottom wall of the secondary hydraulic chamber (521) is provided with a hole (552) connected to the lower section of the rear flow channel (55); the right end of the hydraulic piston valve (541) is a conical end (5412) capable of blocking the liquid outlet hole (551); the main hydraulic chamber and the secondary hydraulic chamber (521) are cylindrical cavities; the cross-sectional area of ​​the main hydraulic chamber is larger than the cross-sectional area of ​​the secondary hydraulic chamber (521); a circular piston plate (5411) is provided in the main hydraulic chamber and is fixed to the hydraulic piston valve (541) on the right side; the left side of the piston plate (5411) bears hydraulic pressure; the cross-sectional area of ​​the piston plate (5411) is larger than the cross-sectional area of ​​the right end of the hydraulic piston valve (541).

3. The liquid-gas controlled sequential automatic bottle-changing infusion set according to claim 2, wherein: The cross-sectional area of ​​the piston plate (5411) is 15 to 40 times larger than the cross-sectional area of ​​the right end of the hydraulic piston valve (541).

4. The liquid-gas jointly controlled sequential automatic bottle-changing infusion set according to claim 1, characterized in that: An expanded annular air cavity (562) is provided on the inner wall of the middle part of the cylinder bore (531), and an air inlet hole (561) leading to the outside is provided on the bottom wall of the annular air cavity (562). The air inlet hole (561) and the annular air cavity (562) form an air inlet passage (56). The rear air passage (58) is an air outlet hole provided on the top wall of the annular air cavity (562). The front air passage (57) has a conical air inlet hole (571) provided on the left side wall of the annular air cavity (562). The air valve (542) is coaxially arranged with the air inlet hole (571) in the annular air cavity (562) on the left side of the air inlet hole (571). The air valve (542) is fixedly connected to the hydraulic piston valve (541) via a connecting piece. When the hydraulic piston valve (541) slides toward the main hydraulic chamber (511) to open the rear flow passage (55), the air valve (542) blocks the air inlet hole (571).

5. The liquid-gas jointly controlled sequential automatic bottle-changing infusion set according to claim 1, characterized in that: The rear flow channel (55) includes a flexible manifold (553) whose lower section is connected to the first flow channel (100); the upper end of the manifold (553) is connected to a hole (552) provided on the bottom wall of the secondary hydraulic chamber (521); and a flow limiting clamp (59) is provided at the connection with the first flow channel (100) to temporarily clamp the manifold 3 to prevent the flow of the liquid medicine.

6. The liquid-gas jointly controlled sequential automatic bottle-changing infusion set according to claim 4, characterized in that: The main hydraulic chamber (511) comprises a main hydraulic chamber (51), the right side of the main hydraulic chamber (51) is open, the left end of the cylinder sleeve (53) is a disc-shaped body (532), and the right side of the main hydraulic chamber (51) is sealed and assembled with the disc-shaped body (532) at the left end of the cylinder sleeve (53); the secondary hydraulic chamber (521) comprises a secondary hydraulic chamber (52), the left side of the secondary hydraulic chamber (52) is open, and the left side of the secondary hydraulic chamber (52) is sealed and assembled with the right end of the cylinder sleeve (53); the cylinder sleeve (53) is divided into a left end sleeve (533) and a right end sleeve (534) which are sealed and assembled, and the annular air chamber (562) is arranged in the left end sleeve (533) and has an opening at the right end of the left end sleeve (533).

7. The liquid-gas jointly controlled sequential automatic bottle-changing infusion set according to any one of claims 1 to 6, characterized in that: The invention comprises a plurality of liquid-gas control units (5), wherein the plurality of liquid-gas control units (5) are sequentially assembled in series downwardly in a first flow channel (100), and the leading air channel (57) of the lower liquid-gas control unit (5) is communicated with the air inlet channel (56) of the upper liquid-gas control unit (5).

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