Liquid-gas joint control infusion apparatus capable of automatically changing bottles in sequence

Abstract

The invention discloses a liquid-gas joint control sequential automatic bottle changing infusion apparatus which comprises 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 communicated with a first medicine bottle and an intravenous injection needle, and the upper end of the rear flow channel is communicated with a rear medicine bottle. The lower end of the liquid-gas joint controller is communicated with 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 a gas inlet channel, the gas inlet channel is branched in the liquid-gas joint controller to form a preceding gas channel and a following gas channel which lead to the outside of the liquid-gas joint controller, the preceding gas channel is communicated with a preceding medicine bottle, and the following gas channel is communicated with a following medicine bottle; when the liquid-gas joint controller opens the rear flow channel, the preceding flow channel is synchronously closed, and all the preceding medicine bottles stop feeding gas, so that residual medicine liquid in all the preceding medicine bottles is forced to stop flowing downwards. The device has the advantages that a plurality of medicine bottles can be simultaneously hung on the rack and are automatically replaced and instilled in sequence; and excessive mixing between the liquid medicine in the later medicine bottle and the residual liquid medicine in the front medicine bottle can be avoided when the liquid medicine in the later medicine bottle is instilled.

Description

Technical Field

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

[0002] The common infusion device used in the prior art has only one infusion channel. When there are many infusion bottles, the medical staff often needs to manually insert the infusion device into the next infusion bottle to change the bottle for infusion when the liquid medicine in the previous infusion bottle is infused. Since the time period of bottle changing is not long, and the medical staff is reminded to change the bottle by manually watching the infusion status and the timing of bottle changing, especially when the number of patients is large and scattered, the frequent bottle changing makes the medical staff very busy and under great work pressure, and they have no time to take care of the infusion status and the timing of bottle changing. The patient or family members often need to observe the infusion status and the timing of bottle changing, and the patient or family members often fail to remind the medical staff to change the bottle in time due to lack of concentration, or although the patient or family members remind the medical staff, the medical staff cannot change the bottle in time due to busyness. It often happens that the medical staff fails to change the bottle in time, which delays the infusion work and increases the task of changing the bottle due to the transition of the liquid medicine, making the infusion work more complicated and heavy. Currently, the industry has begun to use intelligent monitoring and control technology to solve the above problems. However, the intelligent automatic bottle-changing infusion system is complex in structure and expensive in product, and the one-time use cost is too high, making it difficult to popularize it 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 technology. However, there are widespread problems such as excessive mixing of the liquid in the front bottle and the liquid in the back bottle due to unreliable control, and the volume of the improved part is too large. The liquids in different bottles are not suitable for large-scale mixed injection due to their different components, otherwise there is no need to inject them in sequence in separate bottles. However, in actual operation, when the liquid in the previous bottle is dripped and then the next bottle is added, the liquid in the next bottle and the liquid in the previous bottle enter the same infusion tube, and the liquid in the next bottle on the top of the infusion tube is not separated from the liquid in the previous bottle on the bottom. This is because the aperture of the infusion tube and the aperture of the Maofei dropper are both small, the contact amount between the upper and lower liquids is extremely small, and the amount of mixing is also very small, so it is within the allowable range.

[0004] Next, we take the technical solution disclosed in the invention patent document with application number 201410805338.4 as an example to illustrate the cause of the defect that the liquid in the front bottle and the liquid in the rear bottle will cause excessive mixing during actual use.

[0005] The patent document discloses a pressure differential type automatic bottle-changing infusion device, which connects the middle and lower ends of two or more infusion channels in parallel, and adjusts the hanging height of each infusion bottle or tank, or makes the infusion channel at the end of the infusion order partially or completely empty, or keeps the pressure in each infusion bottle or tank from high to low in a certain range or constant level in the infusion order, so that the pressure of the infusion channel at the beginning of the infusion order is always greater than the pressure of the infusion channel at the end of the infusion order before the infusion is completed, thereby maintaining a certain pressure difference; the infusion device automatically determines the bottle changing order and bottle changing timing according to the pressure difference between the infusion channels and the state of the control valve to complete the automatic orderly bottle changing infusion work.

[0006] To facilitate description and understanding, this document supplements the names of the drawings of the embodiments of the scheme and renumbers them.

[0007] Embodiment 1 in this scheme: like Fig.11 As shown, the liquid level of the medicine in the first medicine bottle 1 is lower than the liquid level of the medicine in the second medicine bottle 2, and 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 infusion process, when the liquid level of the medicine in the first medicine bottle 1 is equal to the liquid level of the medicine in the second medicine bottle 2, the liquid pressure at the lower end of the upper infusion tube 104 of the first medicine bottle 1 is equal to the liquid pressure at the lower end of the upper infusion tube 204 of the second medicine bottle 2, and the medicine in the second medicine bottle 2 will inevitably begin to flow downward with the remaining medicine in the first medicine bottle 1 and mix in the common infusion tube 8, so that all the remaining medicine in the first medicine bottle 1 will form an unauthorized excessive mixing with the medicine in the second medicine bottle. In fact, the medicine liquid in the first medicine bottle 1 does not necessarily wait until the liquid level is completely equal to the liquid level in the second medicine bottle 2 before the medicine liquid in the second medicine bottle 2 starts to flow. Instead, the medicine liquid in the second medicine bottle 2 will flow when the liquid level in the first medicine bottle is still higher than the liquid level in the second medicine bottle, which will cause more medicine liquid in the first medicine bottle 1 to mix with the medicine liquid in the second bottle.

[0008] Embodiment 2 in this scheme: like Fig.12 As shown, the liquid medicine in the first medicine bottle 1 exists in valve chamber 205 and valve chamber 304, and the liquid medicine in the second medicine bottle 2 and the third medicine bottle 3 will be mixed with the liquid medicine in the first medicine bottle 1 in valve chamber 205 and valve chamber 304 respectively.

[0009] The gas entering the first medicine bottle 1 and the second medicine bottle 2 is not closed when the third medicine bottle 3 is dripped. The residual medicine liquid in the first medicine bottle 1 and the second medicine bottle 2 will all flow down and mix with the medicine liquid in the third medicine bottle 3, and there is a risk that the gas will enter the Moffitt dropper 6, causing the Moffitt dropper 6 to lose pressure.

[0010] 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

[0011] 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.

[0012] In view of the above problems, the technical solution proposed by the present invention is: A liquid-gas-controlled sequential automatic bottle-changing infusion device comprises a first flow channel, a subsequent flow channel and a liquid-gas-controlled 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-controlled device and connects to the first flow channel below the liquid-gas-controlled device, the liquid-gas-controlled device is provided with an air inlet, the air inlet is bifurcated in the liquid-gas-controlled device to form a preceding air channel and a subsequent air channel leading to the outside of the liquid-gas-controlled device, the preceding air channel connects to the preceding medicine bottle, and the subsequent air channel connects to the subsequent medicine bottle, when the liquid-gas-controlled device opens the subsequent flow channel, the preceding air channel is synchronously closed, and all the preceding medicine bottles stop taking in air, so that the remaining liquid in all the preceding medicine bottles is forced to stop flowing downward.

[0013] 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.

[0014] 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.

[0015] The right side wall of the secondary hydraulic chamber is provided with a conical liquid outlet hole connected to the upper section of the rear flow channel, the bottom wall of the secondary hydraulic chamber is provided with a hole 1 connected to the lower section of the rear flow channel, the right end of the hydraulic piston valve is a conical end capable of blocking the liquid outlet hole, the main hydraulic chamber and the secondary hydraulic chamber are cylindrical cavities, the cross-sectional area of ​​the main hydraulic chamber is larger than the cross-sectional area of ​​the secondary hydraulic chamber, a circular piston plate is provided on the right side of the main hydraulic chamber and is fixed to the hydraulic piston valve, 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.

[0016] 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.

[0017] An elastic left sealing membrane is provided in the main hydraulic chamber, the liquid in the main hydraulic chamber is located on the left side of the left sealing membrane, the piston plate is located on the right side of the left sealing membrane, and an elastic right sealing membrane is provided at the right end of the secondary hydraulic chamber, the liquid in the secondary hydraulic chamber is located on the right side of the right sealing membrane, and the right end of the hydraulic piston valve is located on the left side of the right sealing membrane. The left sealing membrane and the right sealing membrane prevent the liquid from entering the cylinder liner, and the gas output from the preceding air passage and the succeeding air passage can only be input from the intake passage.

[0018] An expanded annular air cavity is provided on the inner wall in the middle of the cylinder liner hole, and an air inlet hole leading to the outside is provided on the bottom wall of the annular air cavity. The air inlet hole and the annular air cavity form an air inlet passage. The rear air passage is an air outlet hole provided on the top wall of the annular air cavity. The preceding air passage has a conical air inlet hole provided on the left side wall of the annular air cavity. The air valve is provided in the annular air cavity on the left side of the air inlet hole coaxially with the air inlet hole. The air valve is fixedly connected to the hydraulic piston valve through a connecting piece. When the hydraulic piston valve slides toward the main hydraulic cavity to open the rear flow passage, the air valve blocks the air inlet hole.

[0019] The rear flow channel includes a flexible manifold whose lower section is connected to the first flow channel. The upper end of the manifold is connected to a hole opened on the bottom wall of the secondary hydraulic chamber. A flow limiting clamp is provided at the connection with the first flow channel to temporarily clamp the manifold 3 to prevent the flow of the liquid medicine.

[0020] The main hydraulic chamber has a main hydraulic chamber body, the right side of the main hydraulic chamber body is open, the left end of the cylinder liner body is a disc-shaped body, and the right side of the main hydraulic chamber body is sealed and assembled with the disc-shaped body at the left end of the cylinder liner body; the secondary hydraulic chamber has a secondary hydraulic chamber body, the left side of the secondary hydraulic chamber body is open, and the left side of the secondary hydraulic chamber body is sealed and assembled with the right end of the cylinder liner body; the cylinder liner body is divided into a left end liner body and a right end liner body that are sealed and assembled, and the annular air chamber is arranged in the left end liner body and has an opening at the right end of the left end liner body.

[0021] The liquid-gas control sequential automatic bottle-changing infusion device comprises a plurality of liquid-gas control devices, which are assembled in series in a first flow channel in sequence downward, and the leading air channel of the lower liquid-gas control device is connected to the air inlet channel of the upper liquid-gas control device. Beneficial Effects

[0022] 1. It can realize automatic bottle replacement and dripping of multiple medicine bottles on the rack at the same time; 2. It can prevent the residual liquid in the previous medicine bottle from mixing with the liquid in the latter medicine bottle when the liquid is dripped; 3. It can prevent the gas from entering the Moffitt dropper through the airway of the front medicine bottle, causing the Moffitt dropper to lose pressure; 4. The actual volume of the liquid-gas controller, the main component of the bottle-changing infusion set, is only the size of a small bottle cap. The material cost of its production is not high, and it can be suitable for mass production and disposable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic plan view of an automatic bottle-changing infusion device for two medicine bottles in Example 1; Figure 2 for Figure 1 A partial schematic diagram of Figure 3 for Figure 1 A partial schematic diagram of the invention mainly shows the liquid-gas joint controller part; Figure 4 It is a cross-sectional schematic diagram of the liquid-gas joint controller of the first embodiment, in which the rear flow channel is closed and the liquid of the first medicine bottle flows downward in the first flow channel; Figure 5 for Figure 4 A partial schematic diagram of Figure 6 It is a three-dimensional schematic diagram of the joint-control piston valve of Example 1; Figure 7 It is a cross-sectional schematic diagram of the liquid-gas joint controller of the first embodiment, showing that the rear flow channel is opened, the front gas channel is closed, and the residual liquid in the first medicine bottle in the first flow channel stops flowing downward; Figure 8 This is a schematic diagram of the disassembly of the liquid-gas joint controller described in Example 1; Fig. 9 This is a schematic plan view of a plurality of four medicine bottles using an automatic bottle-changing infusion device according to Example 2; Fig.10 for Fig. 9 A partial schematic diagram of .

[0024] Fig.11 It is a cross-sectional schematic diagram of a first embodiment of the prior art; Fig.12 It is a cross-sectional schematic diagram of the second embodiment of the prior art.

[0025] In the figure: 1. First medicine bottle; 100. First flow channel; 101. First bottle infusion hose; 102. First bottle air intake hose; 103. Double-hole needle 1; 104. Upper infusion tube 1; 2. Second medicine bottle; 201. Second bottle infusion hose; 202. Second bottle air intake hose; 203. Double-hole needle 2; 204. Upper infusion tube 2; 205. Valve chamber 2; 3. Third medicine bottle; 301. Third bottle infusion hose; 302. Third bottle air intake hose; 303. Double-hole needle 3; 304. Valve chamber 3; 4. Fourth medicine bottle; 401. Fourth bottle infusion hose; 402. Fourth bottle air intake hose; 403. Double-hole needle 4; 5. Liquid-gas joint controller; 51. Main hydraulic chamber; 511. Main liquid Pressure chamber; 5111, left sealing membrane; 52, secondary hydraulic chamber; 521, secondary hydraulic chamber; 5211, right sealing membrane; 53, cylinder sleeve body; 531, cylinder sleeve hole; 532, disc-shaped body; 533, left end sleeve body; 534, right end sleeve body; 54, joint control piston valve; 541, hydraulic piston valve; 5411, piston plate; 5412, tapered end; 542, air valve; 55, rear flow channel; 551, liquid outlet hole; 552, hole one; 553, manifold; 56, air inlet; 561, air inlet hole; 562, annular air chamber; 57, first air channel; 571, air inlet hole; 58, rear air channel; 59, flow limiting clamp; 6, Moffitt's dropper; 7, intravenous injection needle; 8, common delivery tube. DETAILED DESCRIPTION

[0026] For the convenience of description and more intuitive understanding of the present invention, the directional words "left" and "right" used in this article only indicate the directions shown in the drawings of this application and are not used to limit the directions in actual applications.

[0027] The present invention will be further described below in conjunction with the accompanying drawings: Embodiment 1

[0028] like Figure 1As shown in FIG. 4 , a liquid-gas control sequential automatic bottle changing infusion device comprises a first flow channel 100, a rear flow channel 55 and a liquid-gas control device 5 arranged 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 the rear medicine bottle, and the lower end passes through the liquid-gas control device 5 and connects with the first flow channel 100 below the liquid-gas control device 5. The liquid-gas control device 5 is provided with an air inlet 56. The air inlet 56 is bifurcated in the liquid-gas control device 5 to form a leading air channel 57 and a rear air channel 58 leading to the outside of the liquid-gas control device 5. The leading air channel 57 connects to the leading medicine bottle, and the rear air channel 58 connects to the rear medicine bottle. When the liquid-gas control device 5 opens the rear flow channel 55, the leading air channel 57 is closed synchronously, and all the leading medicine bottles stop taking in air, so that the remaining liquid in all the leading medicine bottles is forced to stop flowing downward. When only one liquid-gas joint controller 5 is used in the bottle-changing infusion device, two medicine bottles can be controlled to realize automatic bottle-changing during infusion. When the first medicine bottle 1 drips infusion to the human body through the first flow channel 100, the liquid-gas joint controller 5 will close the rear flow channel 55, and the gas enters the first medicine bottle 1 through the air inlet 56, the preceding air channel 57, and the first bottle air inlet hose 102, providing normal atmospheric pressure for the first medicine bottle 1, so that the liquid in the first medicine bottle 1 can flow downward. When the liquid in the first medicine bottle 1 is dripped, the liquid-gas joint controller 5 starts the dripping of the liquid in the second medicine bottle 2, and closes the preceding air channel 57 at the same time, so that the gas cannot enter the first medicine bottle 1, so that the residual liquid in the first medicine bottle 1 forms a negative pressure in the first medicine bottle 1 due to gravity, thereby preventing the residual liquid in the first medicine bottle 1 and the first bottle infusion hose 101 at the upper section of the first flow channel 100 from flowing downward, and avoiding mixing with the liquid in the second medicine bottle 2 being dripped. At the same time, it can also prevent gas from entering the Moffitt dropper 6 through the previous flow channel, the first medicine bottle 1 and the first bottle infusion hose 101, causing the Moffitt dropper 6 to lose pressure.

[0029] 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, and the rear flow channel 55 includes the liquid output flow channels of the second medicine bottle 2, the third medicine bottle 3 and the subsequent medicine bottles except the first medicine bottle 1. Figure 1 , 3 As can be seen from Figures 9 and 10, the liquid output channels of the second medicine bottle 2, the third medicine bottle 3 and the subsequent medicine bottles for sequential infusion are connected to the first flow channel 100 in sequence from the first flow channel 100 downward, that is, the lower end of the output channel of any subsequent medicine bottle is directly connected to the first flow channel 100 through the manifold 553, rather than being connected to the output channel of the previous medicine bottle. Therefore, it is defined that the liquid output channels of the second medicine bottle 2, the third medicine bottle 3 and the subsequent medicine bottles except the first medicine bottle 1 are all the subsequent flow channels 55 relative to the first flow channel 100. The middle section of the subsequent flow channel 55 passes through the secondary hydraulic chamber 52 of the liquid-gas joint controller 5.

[0030] In this embodiment, the specific structure and working principle of the automatic bottle-changing infusion device are explained by taking the example of using one liquid-gas joint controller 5 to control two medicine bottles.

[0031] like Figure 1 As shown in FIG. 3 , the liquid outlet channel of the first medicine bottle 1 is the first channel 100, the upper section of the first channel 100 is the first bottle infusion hose 101, and the upper end of the first bottle infusion hose 101 is a double-hole needle 103 with liquid outlet and air intake functions inserted into the first medicine bottle 1. A first bottle air intake hose 102 is provided between the double-hole needle 103 and the first air channel 57 of the liquid-gas joint controller 5.

[0032] The liquid output channel of the second medicine bottle 2 is the rear channel 55 relative to the first channel 100, and includes: a double-hole needle 203 with liquid outlet and air intake functions inserted into the second medicine bottle 2, a second bottle infusion hose 201 below the double-hole needle 203, a section located in the secondary hydraulic cavity 52, and a manifold 553 below the secondary hydraulic cavity 52. ​​A second bottle air intake hose 202 is provided between the double-hole needle 103 and the front air channel 57 of the liquid-gas joint controller 5.

[0033] like Figure 4As shown in FIG. 7 , the left side of the hydraulic-gas joint controller 5 has a main hydraulic chamber 511 connected to the first flow channel 100, and the right side has a secondary hydraulic chamber 521 connected to the rear flow channel 55. The cylinder liner 53 is between the main hydraulic chamber 511 and the secondary hydraulic chamber 521, and the air inlet 56 is A leading air passage 57 and a trailing air passage 58 are provided on the lower side of the cylinder liner body 53, which enter the cylinder liner body 53 and branch inside the cylinder liner body 53 to form a leading air passage 57 and a trailing air passage 58 leading to the outside of the upper side of the cylinder liner body 53. A cylinder liner hole 531 is provided in the cylinder liner body 53. A joint control piston valve 54 is provided in the cylinder liner hole 531, and the left end of the cylinder liner hole 531 is subjected to the axial pressure of the main hydraulic chamber 511, and the right end of the cylinder liner hole 531 is subjected to the axial pressure of the secondary hydraulic chamber 521, and can simultaneously control the opening and closing of the trailing flow passage 55 and the leading air passage 57. When the axial pressure of the main hydraulic chamber 511 is greater than the axial pressure of the secondary hydraulic chamber 521, the joint control piston valve 54 slides toward the secondary hydraulic chamber 521 to close the trailing flow passage 55. When the pressure of the main hydraulic chamber 511 is less than the pressure of the secondary hydraulic chamber 521, the joint control piston valve 54 slides toward the main hydraulic chamber 511 to open the trailing flow passage 55 and close the leading air passage 57. The joint control piston valve 54 is composed of a rigidly connected hydraulic piston valve 541 and an air valve 542. The hydraulic piston valve 541 is located in the cylinder bore 531. The left and right ends of the hydraulic piston valve 541 bear the liquid pressure of the main hydraulic chamber 511 and the secondary hydraulic chamber 521 respectively. Specifically: 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, and 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 that of the secondary hydraulic chamber 521. A circular piston plate 5411 fixed to the right side of the hydraulic piston valve 541 is provided in the main hydraulic chamber. The left side of the piston plate 5411 bears the hydraulic pressure. The cross-sectional area of ​​the piston plate 5411 is larger than that of the hydraulic piston valve 541. The cross-sectional area of ​​the right end; an expanded annular air cavity 562 is provided on the inner wall of the middle part of the cylinder sleeve hole 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, and 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 coaxial with the air inlet hole 571 and is provided in the annular air cavity 562 on the left side of the air inlet hole 571. 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.

[0034] The principle of the above arrangement is: when the liquid medicine in the first medicine bottle 1 flows downward through the first bottle infusion hose 101, it enters the main hydraulic chamber 511, and forms a rightward hydraulic pressure F1 on the piston plate 5411 of the main hydraulic chamber. The hydraulic pressure of the main hydraulic chamber 511 is P1, and the pressure 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 chamber 521 through the first bottle infusion hose 101 from the liquid outlet 551 in the rear flow channel 55, and the right end of the hydraulic piston valve 541 is subjected to a leftward pressure F2. The hydraulic pressure of the secondary hydraulic chamber 521 is P2, and the pressure area of ​​the right end of the hydraulic piston valve 541 is S2, and F1= P2·S2; By increasing the pressure area S1 of the piston plate 5411 and making S1 much larger than S2, it is ensured that when the hydraulic pressure P1 of the main hydraulic chamber 511 is equal to or less than the hydraulic pressure P2 of the secondary hydraulic chamber 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 chamber 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, so that the hydraulic piston valve 541 blocks the liquid outlet 551 to the right. Only when the pressure in the main hydraulic chamber 511 drops to a very low level or even close to zero (there is little liquid in the first flow channel 100 above the main hydraulic chamber 511, and the liquid level is very low), the rightward pressure F1 on the left end of the hydraulic piston valve 541 will be less than the leftward pressure F2 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 551, so that the liquid in the second medicine bottle 2 behind starts to drip downward. At the same time, the air valve 542 slides to the left with the hydraulic piston valve 541 to block the air inlet 571, thereby preventing the residual liquid in the first bottle of infusion hose 101 from flowing downward, and preventing gas from entering the Moffitt dropper 6, causing the Moffitt dropper 6 to lose pressure.

[0035] Furthermore, 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 area difference, even if there is little liquid medicine in the pipeline above the main hydraulic chamber 511, the pressure F1 to the right of the hydraulic piston valve 541 can be maintained 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 can be almost completely infused, thereby minimizing the waste of liquid medicine in the first medicine bottle 1.

[0036] If there are more than three bottles of medicine liquid and the rack is automatically replaced at the same time, when the last bottle of medicine liquid begins to drip, the airways of all the previous medicine bottles are blocked, and the residual medicine liquid in all the medicine bottles will not flow down and mix with the medicine liquid dripped from the next bottle. This is explained in Example 2.

[0037] 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, 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, and 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 sleeve body 53, and the gas output from the preceding air passage 57 and the following air passage 58 can only be input from the air inlet 56. In this way, when in use, the liquid in the main hydraulic chamber applies rightward pressure to the piston plate 5411 through the left sealing film 5111, and the liquid in the secondary hydraulic chamber applies leftward pressure to the right end of the hydraulic piston valve 541 through the right sealing film 5211. The advantage of such a configuration is that it can completely prevent the liquid in the primary hydraulic chamber 511 and the secondary hydraulic chamber 521 from entering the interior of the cylinder sleeve, thereby ensuring the sealing of the internal air passage and preventing the liquid from entering the internal air passage.

[0038] 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 opened on the bottom wall of the secondary hydraulic chamber 521. A current limiting clamp 59 is provided at the connection with the first flow channel 100 to temporarily clamp the manifold 553 to prevent the flow of the liquid medicine. When used, the current limiting clamp 59 is first opened, and the double-hole needle 203 is inserted into the second medicine bottle 2, so that the liquid medicine in the second medicine bottle 2 to which it belongs flows down to nearly fill the rear flow channel 55 (at this time, there is no hydraulic pressure in the main hydraulic chamber, and the rear flow channel is not closed), and then the current limiting clamp 59 is clamped to prevent the liquid medicine from entering the first flow channel 100, and then the double-hole needle 103 is inserted into the first medicine bottle 1, so that the liquid medicine in the first medicine bottle 1 occupies the entire first flow channel 100, so that the rear flow channel 55 is closed, and then the current limiting clamp 59 is loosened and removed. In this way, it can be ensured that the liquid medicine in the first medicine bottle 1 will not enter the secondary hydraulic chamber 521 above the manifold 553 to avoid mixing with the liquid medicine in the second medicine bottle 2, and it can also be ensured that no air will accumulate inside the manifold 553.

[0039] like Figure 8 As shown, to facilitate the processing and assembly of the hydraulic-gas joint controller 5, the main hydraulic chamber 511 has 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 and the disc-shaped body 532 at the left end of the cylinder sleeve 53 are sealed and assembled; the secondary hydraulic chamber 521 has 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 and the right end of the cylinder sleeve 53 are sealed and assembled; the cylinder sleeve 53 is divided into a left end sleeve 533 and a right end sleeve 534 that are sealed and assembled, and the annular air cavity 562 is arranged in the left end sleeve 533 and an opening is left at the right end of the left end sleeve 533.

[0040] Embodiment 2 like Fig. 9 , 10 As shown, the difference from the first embodiment is that the automatic bottle-changing infusion device includes a plurality of liquid-gas controllers 5, and each additional liquid-gas controller 5 can control one more medicine bottle, and the plurality of liquid-gas controllers 5 are assembled in series in sequence downward in the first flow channel 100, and the leading air channel 57 of the lower liquid-gas controller 5 is connected to the air inlet 56 of the upper liquid-gas controller 5.

[0041] When two liquid-gas joint controllers 5 are assembled to control the automatic bottle change of three medicine bottles in sequence, the liquid output channel of the third medicine bottle 3 is the rear channel 55 relative to the first channel 100, including: a double-hole needle 303 with liquid outlet and air intake functions inserted into the third medicine bottle 3 at the upper end, a third bottle infusion hose 301 below the double-hole needle 303, a section located in the secondary hydraulic cavity 52 of the second liquid-gas joint controller 5, and a manifold 553 below the secondary hydraulic cavity 52. ​​There is a third bottle air intake hose 302 between the double-hole needle 103 and the second liquid-gas joint controller 5 front air channel 57. 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 chamber 511 of the second liquid-gas joint controller 5 is less than the pressure F2 to the left on the right end of the hydraulic piston valve 541, so that the hydraulic piston valve 541 slides to the left to open the liquid outlet 551, so that the liquid medicine in the third medicine bottle 3 starts to drip downward. At the same time, the air valve 542 slides to the left with the hydraulic piston valve 541 to block the previous airway of the second liquid-gas joint controller 5, that is, to block the air inlet 56 of the first liquid-gas joint controller above, thereby preventing the residual liquid medicine in the first bottle infusion hose 101 and the second bottle infusion hose 201 from flowing downward.

[0042] When three liquid-gas joint controllers 5 are assembled to control four medicine bottles to change bottles automatically in sequence, the liquid output channel of the fourth medicine bottle 4 is the rear channel 55 relative to the first channel 100, including: a double-hole needle 403 with liquid outlet and air intake functions inserted into the fourth medicine bottle 4 at the upper end, a fourth bottle infusion hose 401 below the double-hole needle 403, a section located in the secondary hydraulic cavity 52 of the third liquid-gas joint controller 5, and a manifold 553 below the secondary hydraulic cavity 52. ​​There is a fourth bottle air intake hose 402 between the double-hole needle 103 and the third liquid-gas joint controller 5 in the front air channel 57. When the liquid medicine in the third medicine bottle 3 is nearly finished, the pressure F1 applied to the left end of the hydraulic piston valve 541 by the main hydraulic chamber 511 of the third liquid-gas joint controller 5 is less than the pressure F2 to the left on the right end of the hydraulic piston valve 541, so that the hydraulic piston valve 541 slides to the left to open the liquid outlet 551, so that the liquid medicine in the fourth medicine bottle 4 starts to drip downward. At the same time, the air valve 542 slides to the left with the hydraulic piston valve 541 to block the previous airway of the third liquid-gas joint controller 5, which is equivalent to blocking the air inlet 56 of the first liquid-gas joint controller and the air inlet 56 of the second liquid-gas joint controller, thereby preventing the residual liquid medicine in the first bottle infusion hose 101, the second bottle infusion hose 201 and the third bottle infusion hose 301 from flowing downward.

[0043] The above implementation modes are limited to explaining the present invention. Without departing from the principle of the present invention, several improvements or modifications made by others should be deemed to fall within the protection scope of the present invention.

Claims

1. A liquid-gas joint control automatic bottle-changing infusion device, characterized in that: The invention comprises a first flow channel (100), a subsequent flow channel (55), and a liquid-gas joint controller (5) disposed between the first flow channel (100) and the subsequent flow channel (55); the first flow channel (100) is connected to a first medicine bottle (1) and an intravenous injection needle (7); the upper end of the subsequent flow channel (55) is connected to the subsequent medicine bottle; the lower end passes through the liquid-gas joint controller (5) and is connected to the first flow channel (100) below the liquid-gas joint controller (5); the liquid-gas joint controller (5) is provided with an air inlet (56) The air inlet passage (56) is bifurcated inside the liquid-gas joint controller (5) to form a leading air passage (57) and a trailing air passage (58) leading to the outside of the liquid-gas joint controller (5). The leading air passage (57) is connected to the leading medicine bottle, and the trailing air passage (58) is connected to the trailing medicine bottle. When the liquid-gas joint controller (5) opens the trailing flow passage (55), the leading air passage (57) is synchronously closed, and all the leading medicine bottles stop taking in air, so that the remaining liquid in all the leading medicine bottles is forced to stop flowing downward.

2. The liquid-gas combined control and automatic bottle-changing infusion device according to claim 1 is characterized in that: The hydraulic-gas joint controller (5) has a main hydraulic chamber (511) on the left side connected to the first flow channel (100), and a secondary hydraulic chamber (521) on the right side connected to the rear flow channel (55). A cylinder sleeve (53) is provided between the main hydraulic chamber (511) and the secondary hydraulic chamber (521). The air inlet (56) is provided on the lower side of the cylinder sleeve (53) to enter the cylinder sleeve (53) and to branch inside the cylinder sleeve (53) to form the preceding air channel (57) and the following air channel (58) leading to the outside of the upper side of the cylinder sleeve (53). A cylinder sleeve hole (531) is provided in the cylinder sleeve (53). The cylinder sleeve hole (531) is provided with a left end receiving axial pressure from the main hydraulic chamber (511) and a right end receiving axial pressure from the secondary hydraulic chamber (521) to simultaneously control the following flow channel (55) and the preceding air channel (58). The invention relates to a linked control piston valve (54) for opening and closing. When the axial pressure of the main hydraulic chamber (511) is greater than the axial pressure of the secondary hydraulic chamber (521), the linked control piston valve (54) slides toward the secondary hydraulic chamber (521) to close the rear flow channel (55); when the pressure of the main hydraulic chamber (511) is less than the pressure of the secondary hydraulic chamber (521), the linked control piston valve (54) slides toward the main hydraulic chamber (511) to open the rear flow channel (55) and close the leading air channel (57).

3. The liquid-gas combined control automatic bottle-changing infusion device according to claim 2 is characterized in that: The joint control piston valve (54) is composed of a rigidly connected hydraulic piston valve (541) and an air valve (542); the hydraulic piston valve (541) is located in the cylinder sleeve hole (531); and the left and right ends of the hydraulic piston valve (541) bear the liquid pressure of the main hydraulic chamber (511) and the secondary hydraulic chamber (521), respectively.

4. The liquid-gas combined control automatic bottle-changing infusion device according to claim 3 is characterized in that: 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).

5. The liquid-gas joint control automatic bottle-changing infusion device according to claim 3 is characterized in that: 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).

6. The liquid-gas joint control automatic bottle-changing infusion device according to claim 3, characterized in that: An elastic left sealing membrane (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 membrane (5111), the piston plate (5411) is located on the right side of the left sealing membrane (5111), an elastic right sealing membrane (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 membrane (5211), and the right end of the hydraulic piston valve (541) is located on the left side of the right sealing membrane (5211), the left sealing membrane (5111) and the right sealing membrane (5211) prevent the liquid from entering the cylinder sleeve body (53), and the gas output from the leading air passage (57) and the trailing air passage (58) can only be input from the air inlet passage (56).

7. The liquid-gas combined control automatic bottle-changing infusion device according to claim 6, 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).

8. The liquid-gas combined control automatic bottle-changing infusion device 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.

9. The liquid-gas combined control and automatic bottle-changing infusion device according to claim 7, 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).

10. The liquid-gas combined control automatic bottle-changing infusion device according to any one of claims 1 to 9, 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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