An infusion pump

Abstract

An embodiment of the present application provides an infusion pump comprising a pump body and an infusion pump, the infusion pump comprising an infusion cartridge, the infusion cartridge comprising a first component, a second component, and a first elastic diaphragm, the second component having a first groove formed on a side facing the first component; the first elastic diaphragm being disposed between the first and second components; the first groove comprising a pump chamber, a first brake chamber, and a second brake chamber, the pump chamber, the first brake chamber, and the second brake chamber being arranged in a straight line; the pump body comprising a pump head frame, a camshaft rotatably mounted on the pump head frame, a plunger assembly, a first brake valve column assembly, a second brake valve column assembly, and a power unit for driving the camshaft to rotate; during rotation, the camshaft drives the plunger assembly, the first brake valve column assembly, and the second brake valve column assembly to sequentially peristaltically squeeze the first elastic diaphragm. The infusion pump of the embodiment of the present application is simple to assemble and has minimal assembly error. Furthermore, the first elastic diaphragm is less likely to experience unexpected displacement and swinging.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an infusion pump. Background Art

[0002] In clinical practice, fluids often need to be infused into patients with extreme precision. Gravity-fed infusion devices often fail to meet these requirements. Instead, infusion pumps are used to precisely regulate the dosage and rate of fluid delivery. Consequently, infusion pumps have become increasingly common in recent years, with various types emerging, including those for general infusion, portable analgesic infusion pumps for pain relief, and those for blood transfusions and chemotherapy.

[0003] Infusion pump technology, the pump body peristaltically squeezes the infusion tube to control the flow of liquid within the tube. One type of infusion pump uses a peristaltic disc to rigidly squeeze the PVC tube in a timed sequence to control the flow of liquid within the infusion set. Repeated squeezing by the peristaltic disc often creates a risk of rupture and leakage in the PVC tube. Furthermore, this type of infusion pump is relatively large and heavy.

[0004] Another type of infusion pump controls the flow of liquid within the infusion pump by sequentially squeezing a flexible silicone tube within the infusion cartridge using peristaltic fingers. The two ends of this flexible silicone tube are relatively fixed, while the remaining portion between the two ends is arranged roughly horizontally along the extrusion plate and is relatively free. Generally speaking, the peristaltic fingers of the pump body may cause the silicone tube to randomly shift and oscillate when peristaltic movement occurs, which can adversely affect infusion accuracy. Furthermore, differences in the length of the silicone tube and the gap between the tube and the extrusion plate during assembly can lead to variations in infusion accuracy. Furthermore, this type of infusion pump places high demands on the clearance between the peristaltic fingers of the pump body and the fixing holes of the peristaltic finger frame. If the clearance is too large, the peristaltic fingers may oscillate and fail to accurately squeeze the silicone tube to the intended position. If the clearance is too small, the peristaltic fingers and the fixing holes of the peristaltic finger frame are prone to friction, affecting the life of the pump head and reducing the peristaltic finger torque. Summary of the Invention

[0005] In view of this, an embodiment of the present application hopes to provide a portable infusion pump.

[0006] To achieve the above-mentioned purpose, an embodiment of the present application provides an infusion pump, comprising a pump body and an infusion device, wherein the infusion device comprises an infusion box and an infusion tube connected to the infusion box, the pump body and the infusion box are detachably matched, the infusion box has a flow channel, the infusion box comprises a first component, a second component and a first elastic diaphragm, the second component has a first groove formed on a side facing the first component; the first elastic diaphragm is arranged between the first component and the second component to seal the first groove, the first elastic diaphragm and the first groove together constitute at least a part of the flow channel; the first groove comprises a pump chamber, a first brake chamber located upstream of the pump chamber, and a second brake chamber located downstream of the pump chamber; the pump chamber, the first brake chamber And the second brake chamber is arranged in a straight line; the pump body is arranged on the side of the first component away from the second component, and the pump body includes a pump head frame, a camshaft rotatably arranged on the pump head frame, a plunger assembly squeezed and matched with the pump chamber, a first brake valve column assembly squeezed and matched with the first brake chamber, a second brake valve column assembly squeezed and matched with the second brake chamber, and a power unit driving the camshaft to rotate, the ends of the plunger assembly, the first brake valve column assembly and the second brake valve column assembly are all in sliding contact with the rotating surface of the camshaft, and the camshaft drives the plunger assembly, the first brake valve column assembly and the second brake valve column assembly to peristaltically squeeze the first elastic diaphragm in sequence during rotation to cause the liquid in the flow channel to produce a directional flow.

[0007] In some embodiments, the first brake valve column assembly and the second brake valve column assembly extrude the first elastic diaphragm in a full-extrusion manner; and the plunger assembly extrude the first elastic diaphragm in a half-extrusion manner.

[0008] In some embodiments, the end face of the plunger assembly used to extrude the first elastic diaphragm is an arc surface, and the shape of the pump chamber is adapted to the shape of the end face of the plunger assembly; and / or, the end face of the first brake valve column assembly used to extrude the first elastic diaphragm is an arc surface, and the shape of the first brake chamber is adapted to the shape of the end face of the first brake valve column assembly; and / or, the end face of the second brake valve column assembly used to extrude the first elastic diaphragm is an arc surface, and the shape of the second brake chamber is adapted to the shape of the end face of the second brake valve column assembly.

[0009] In some embodiments, the infusion box is provided with a liquid inlet at the first end along the length direction, and a liquid outlet at the second end along the length direction. In the projection in the plane perpendicular to the thickness direction of the infusion box, the flow channel, the liquid inlet and the liquid outlet are arranged in a straight line.

[0010] In some embodiments, the power unit includes a motor and a transmission mechanism, and the transmission mechanism is connected between a rotating shaft of the motor and a camshaft.

[0011] In some embodiments, the infusion box further includes a third component, a second elastic diaphragm and a locking mechanism, wherein a second groove is formed on the side of the second component facing away from the first component; the second groove is connected to the first groove and is located downstream of the first groove; the second elastic diaphragm is arranged between the second component and the third component to sealingly cover the second groove; the locking mechanism includes a mounting frame and a liquid stop plug fixedly arranged on the mounting frame, the liquid stop plug can squeeze the second elastic diaphragm to close the flow channel, and the locking mechanism can switch between a closed state of closing the flow channel or an open state of opening the flow channel.

[0012] In some embodiments, the open state includes a first open state; when the infusion box is combined with the pump body, the pump head rack of the pump body forces the mounting frame to move toward the direction of the third component to drive the locking mechanism to switch from the closed state to the first open state and remain in the first open state.

[0013] In some embodiments, the infusion box includes an elastic member, which applies a force to the mounting bracket so that the locking mechanism can remain in a closed state to close the flow channel.

[0014] In some embodiments, when the infusion box is separated from the pump body, the elastic member drives the locking mechanism to switch from the first open state to the closed state and maintain it in the closed state.

[0015] In some embodiments, the open state includes a second open state, and the locking mechanism includes a latching structure provided on the mounting frame; at least one of the first component, the second component, and the third component is locked with the latching structure so that the locking mechanism can enter the second open state and remain in the second open state.

[0016] In some embodiments, part of the structure of the mounting frame protrudes from the side of the first component facing the pump body; a boss for pushing the mounting frame is formed on the side of the pump head frame facing the infusion box, and an inclined surface is formed on the end of the boss facing one end of the infusion box; during the combination of the infusion box and the pump body, the inclined surface pushes the mounting frame to move toward the direction of the third component to fix the locking mechanism in the first open state.

[0017] In some embodiments, the first groove includes two pressure monitoring chambers, one of which is arranged upstream of the first brake chamber, and the other of which is arranged downstream of the second brake chamber. The pump body includes two pressure monitoring devices arranged on the pump head frame, one of which is arranged on the side of the first brake valve column assembly facing away from the plunger assembly, and the other of which is arranged on the side of the second brake valve column assembly facing away from the plunger assembly. The plunger assembly, the first brake valve column assembly, the second brake valve column assembly, and the two pressure monitoring devices are arranged in a straight line.

[0018] In some embodiments, the pressure monitoring chamber located downstream of the second brake chamber is disposed at an end of the first groove along a fluid flow direction.

[0019] In some embodiments, the camshaft is capable of rotating forward and reverse. When the camshaft rotates forward, the camshaft drives the plunger assembly, the first brake valve column assembly, and the second brake valve column assembly to peristalsis in a forward sequence to drive the liquid in the flow channel to flow forward; when the camshaft reverses, the camshaft drives the plunger assembly, the first brake valve column assembly, and the second brake valve column assembly to peristalsis in a reverse sequence to drive the liquid in the flow channel to flow reversely.

[0020] In the infusion pump of the embodiment of the present application, the first and second components are rigid injection-molded parts, and the first elastic diaphragm is a flexible injection-molded part. The injection-molded parts are produced with high precision, are simple to assemble, have small assembly errors, and have good product consistency. In addition, the first elastic diaphragm is disposed between the first and second components. When the first elastic diaphragm is squeezed by the plunger assembly, the first brake valve column assembly, and the second brake valve column assembly, the possibility of the first elastic diaphragm undergoing unexpected displacement and swinging is very small. In addition, in the embodiment of the present application, the plunger assembly, the first brake valve column assembly, and the second brake valve column assembly are driven by the same camshaft. On the one hand, this simplifies the drive structure, making the product compact and portable. On the other hand, only one power unit is required to drive the camshaft to rotate, which can reduce costs and facilitate control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an infusion pump according to an embodiment of the present application, wherein part of the structure is shown in cross-section.

[0022] Figure 2 for Figure 1 A schematic diagram of another state of the infusion pump shown, wherein the pump body and the infusion cassette are in a separated state;

[0023] Figure 3 This is a partial structural diagram of an infusion set according to an embodiment of the present application;

[0024] Figure 4 for Figure 3 An exploded view of the infusion cassette shown;

[0025] Figure 5 for Figure 3 a cross-sectional view of the structure shown;

[0026] Figure 6 for Figure 5 A schematic structural diagram of the second component shown;

[0027] Figure 7 for Figure 5 The structural diagram of the locking mechanism is shown.

[0028] Description of Reference Numerals

[0029] Infusion box 1; first component 11; second component 12; third component 13; first elastic diaphragm 14; second elastic diaphragm 15; stopper 110; first hole 11a; second hole 11b; third hole 11c; fourth hole 11d; first groove 121; second groove 122; flow hole 122a; pump chamber 121a; first brake chamber 121b; second brake chamber 121c; pressure monitoring chamber 121d; flow channel 1a; liquid inlet 1b; liquid outlet 1c; through hole 1d; chute 1f; avoidance hole 13a; locking mechanism Structure 16; mounting frame 161; connecting rod 1611; crossbar 1612; sliding rod 1613; stepped surface 1613a; latching structure 1614; liquid stopper 162; connecting hole 1612a; elastic member 17; pump body 2; plunger assembly 21; first brake valve column assembly 22; second brake valve column assembly 23; camshaft 24; power unit 25; motor 251; transmission mechanism 252; pressure monitoring device 26; ultrasonic bubble monitoring device 27; pump head frame 28; boss 281; inclined surface 281a; infusion tube 3 DETAILED DESCRIPTION

[0030] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0031] In the description of the embodiments of the present application, the directions or positional relationships of "thickness direction" and "length direction" are based on the attached Figure 5 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] The present application provides an infusion pump. Figure 1 and Figure 2 The infusion pump includes a pump body 2 and an infusion set, and the infusion set includes an infusion box 1 and an infusion tube 3 connected to the infusion box 1. It is understandable that the infusion set may also include other accessories, and the specific type of the accessories can be determined according to actual usage, which will not be described here.

[0033] The pump body 2 and the infusion box 1 can be separated and matched. Specifically, when you need to use the infusion pump, please refer to Figure 1 , snap the pump body 2 and the infusion box 1 together. When you are finished using it, please refer to Figure 2 , the pump body 2 and the infusion box 1 can be separated from each other. The infusion box 1 is a disposable consumable, and the pump body 2 is a reusable device for infusion.

[0034] In one embodiment, please refer to Figure 5 The infusion box 1 has a liquid inlet 1b, a liquid outlet 1c, and a flow channel 1a communicating with the liquid inlet 1b and the liquid outlet 1c. One end of an infusion tube 3 is connected to the liquid inlet 1b, and one end of another infusion tube 3 is connected to the liquid outlet 1c. Figure 4 The infusion cartridge 1 includes a first component 11, a second component 12, and a first elastic membrane 14. The first component 11 and the second component 12 are stacked. The second component 12 has a first groove 121 formed on a first side facing the first component 11. Specifically, a portion of the second component 12 is recessed to form the first groove 121, which is open toward the first component 11.

[0035] See also Figure 5 The first elastic diaphragm 14 is disposed between the first component 11 and the second component 12 to seal and cover the first groove 121, so that the liquid can flow along the length of the first groove 121 without leakage. The first elastic diaphragm 14 and the first groove 121 cooperate to form a portion 1a' of the flow channel 1a. Figure 5 The first groove 121 includes a pump chamber 121a, a first brake chamber 121b located upstream of the pump chamber 121a, and a second brake chamber 121c located downstream of the pump chamber 121a. In a plane projection perpendicular to the thickness direction of the infusion cartridge 1, the pump chamber 121a, the first brake chamber 121b, and the second brake chamber 121c are arranged in a straight line.

[0036] The first elastic membrane 14 must meet the biocompatibility requirements specified in relevant standards and be made of a material with expected elasticity and extrusion resistance, such as silicone.

[0037] The pump body 2 is arranged on the side of the first component 11 away from the second component 12. Figure 1The pump body 2 includes a pump head frame 28, a camshaft 24 rotatably arranged on the pump head frame 28, a plunger assembly 21 squeezed into the pump chamber 121a, a first brake valve column assembly 22 squeezed into the first brake chamber 121b, a second brake valve column assembly 23 squeezed into the second brake chamber 121c, and a power unit 25 that drives the camshaft 24 to rotate.

[0038] The ends of the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 are all in sliding contact with the rotating surface of the camshaft 24. During the rotation process, the camshaft 24 drives the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 to peristaltically squeeze the first elastic diaphragm 14 in sequence to cause the liquid in the flow channel 1a to produce a directional flow.

[0039] The order in which the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 are squeezed in sequence is as follows:

[0040] Stage S1: When the first brake valve column assembly 22 presses the first elastic diaphragm 14 against the wall of the first brake chamber 121b, cutting off the flow of liquid in the first brake chamber 121b, the second brake valve column assembly 23 opens, and the plunger assembly 21 squeezes the first elastic diaphragm 14 at the corresponding position of the pump chamber 121a, compressing the space within the pump chamber 121a, causing the liquid in the pump chamber 121a to flow downstream. In other words, when the plunger assembly 21 squeezes, the second brake valve column assembly 23 located downstream is in the open state.

[0041] Stage S2: The second brake valve column assembly 23 presses the first elastic diaphragm 14 against the wall of the second brake chamber 121c, cutting off the flow of liquid in the second brake chamber 121c; the second brake valve column assembly 23 is opened and the plunger assembly 21 is opened, and accordingly, the area of ​​the first elastic diaphragm 14d corresponding to the pump chamber 121a rebounds to an un-squeezed state, thereby generating negative pressure in the pump chamber 121a, and the upstream liquid enters the pump chamber 121a to fill the space inside the pump chamber 121a.

[0042] The above-mentioned S1 stage and S2 stage are repeated in a cycle to achieve directional flow of the liquid in the flow channel 1a.

[0043] In the infusion pump of the embodiment of the present application, the first component 11 and the second component 12 are rigid injection molded parts, and the first elastic diaphragm 14 is a flexible injection molded part. The injection molded parts have high production and processing precision, are simple to assemble, have small assembly errors, and have good product consistency. In addition, the first elastic diaphragm 14 is arranged between the first component 11 and the second component 12. When the first elastic diaphragm 14 is squeezed by the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23, the possibility of the first elastic diaphragm 14 undergoing unexpected displacement and swing is very small. In addition, in the embodiment of the present application, the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 are driven by the same camshaft 24. On the one hand, this can simplify the drive structure, making the product structure compact and portable; on the other hand, only one power unit is needed to drive the camshaft 24 to rotate, which can reduce costs and facilitate control.

[0044] In the related art, all peristaltic plates will fully squeeze the flexible infusion tube to open or close the inner cavity of the tube. If the squeezed part is a flexible PVC tube, the squeezed part may be damaged and leak if the infusion pump works for a while. In addition, the use of peristaltic plates to fully squeeze the flexible infusion tube may cause necrosis of a large number of blood cells in the infusion tube, which is only suitable for ordinary infusion, not suitable for blood transfusion.

[0045] Therefore, in one embodiment of the present application, the first brake valve column assembly 22 and the second brake valve column assembly 23 squeeze the first elastic diaphragm 14 in a full squeezing manner; the plunger assembly 21 squeezes the first elastic diaphragm 14 in a half squeezing manner.

[0046] It should be noted that, taking the first brake valve column assembly 22 as an example, the full squeezing means that the end of the first brake valve column assembly 22 abuts the first elastic diaphragm 14 against the wall of the first brake chamber 121b, thereby cutting off the liquid flow in the first brake chamber.

[0047] The semi-extrusion means that the end of the plunger assembly 21 will not abut the first elastic diaphragm 14 against the wall of the pump chamber 121a, so that there is a certain gap between the first elastic diaphragm 14 and the wall of the pump chamber 121a. The specific size of the gap is not limited. The gap enables the liquid to flow between the first elastic diaphragm 14 and the wall of the pump chamber 12a. In other words, the plunger assembly 21 does not cut off the flow of liquid at the pump chamber 121a.

[0048] It should be noted that the main function of the first brake valve column assembly 22 and the second brake valve column assembly 23 is to cut off the flow. Therefore, the area of ​​the end portion used to contact the first elastic diaphragm 14 can be made smaller. When it squeezes the first elastic diaphragm 14, the squeezing effect on the liquid in the flow channel is smaller.

[0049] In this embodiment, since the plunger assembly 21 squeezes the first elastic diaphragm 14 in a semi-squeezing manner, and when the plunger assembly 21 squeezes the first elastic diaphragm 14, the downstream second brake valve column assembly 23 is in an open state, the plunger assembly 21 has a small risk of damaging blood cells in the blood, and the risk of blood cell damage is within the acceptable range of medical clinical practice. Therefore, the infusion pump of the embodiment of the present application can be used for blood transfusion, and other conventional infusion, analgesia, chemotherapy and other scenarios.

[0050] In one embodiment, the end surface of the plunger assembly 21 used to squeeze the first elastic diaphragm 14 is a circular arc, and the shape of the pump chamber 121a is adapted to the end surface of the plunger assembly 21. During squeezing, the end of the plunger assembly 21 and the pump chamber 121a adapt to each other, thereby reducing the clearance machining requirements for the mounting hole in the pump head frame 28 that accommodates the plunger assembly 21. Furthermore, the first elastic diaphragm 14 inherently has excellent squeezing resistance, and the circular arc end surface of the plunger 21 significantly reduces the risk of damage and leakage from repeated squeezing.

[0051] In one embodiment, the end surface of the first brake valve column assembly 22 used to squeeze the first elastic diaphragm 14 is a circular arc surface, and the shape of the first brake chamber 121b is adapted to the end surface shape of the first brake valve column assembly 22. During squeezing, the end of the first brake valve column assembly 22 can adapt to the first brake chamber 121b, thereby reducing the clearance machining requirements for the mounting hole on the pump head frame 28 that accommodates the first brake valve column assembly 22. Similarly, the first elastic diaphragm 14 inherently has excellent squeezing resistance, and the circular arc end surface of the first brake valve column assembly 22 significantly reduces the risk of damage and leakage from repeated squeezing.

[0052] In one embodiment, the end surface of the second brake valve spool assembly 23 used to compress the first elastic diaphragm 14 is a circular arc surface, and the shape of the second brake chamber 121c is adapted to the end surface shape of the second brake valve spool assembly 23. During compression, the end of the second brake valve spool assembly 23 can adapt to the second brake chamber 121c, thereby reducing the clearance machining requirements for the mounting hole on the pump head frame 28 that accommodates the second brake valve spool assembly 23. Similarly, the first elastic diaphragm 14 inherently has excellent compression resistance, and the circular arc end surface of the second brake valve spool assembly 23 significantly reduces the risk of damage and leakage from repeated compression.

[0053] It should be noted that the plunger assembly 21 can be a single column or a structure composed of multiple columns. Similarly, the first brake valve column assembly 22 can be a single column or a structure composed of multiple columns. The second brake valve column assembly 23 can be a single column or a structure composed of multiple columns. This embodiment of the present application does not impose any restrictions on this.

[0054] In one embodiment, the camshaft 21 is capable of rotating forward and reverse. When the camshaft 21 rotates forward, the camshaft 21 drives the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 to peristalsize in a forward sequence to drive the liquid in the flow channel to flow forward, that is, the above-mentioned S1 stage and S2 stage are cycled. When the liquid flows forward, the liquid enters the patient's body. When the camshaft 21 reverses, the camshaft 21 drives the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 to peristalsize in a reverse sequence to drive the liquid in the flow channel to flow in the reverse direction. When the liquid is blocked during the delivery process, the camshaft 21 can be controlled to reverse precisely, and the infusion pump can pump back the liquid to release the blocking pressure, greatly reducing the risk of harm to the patient caused by the blocking pressure.

[0055] In one embodiment, please refer to Figure 6 A first hole 11a corresponding to the pump chamber 121a, a second hole 11b corresponding to the first brake chamber 121b, and a third hole 11c corresponding to the second brake chamber 121c are formed on the first component 11. The plunger assembly 21 can squeeze the first elastic diaphragm 14 through the first hole 11a, the first brake valve column assembly 22 can squeeze the first elastic diaphragm 14 through the second hole 11b, and the second brake valve column assembly 23 can squeeze the second elastic diaphragm 15 through the third hole 11c.

[0056] In one embodiment, please refer to Figure 5 The inlet 1b is located at the first end of the infusion cartridge 1 along its length, and the outlet 1c is located at the second end of the infusion cartridge 1 along its length. When projected onto a plane perpendicular to the thickness of the infusion cartridge 1, the flow channel 1a, the inlet 1b, and the outlet 1c are arranged in a straight line. This allows the infusion cartridge 1 to assume a generally elongated shape and facilitates the arrangement of the corresponding structure of the pump body 2. It is understood that in other embodiments, the flow channel 1a, the inlet 1b, and the outlet 1c may not be arranged in a straight line.

[0057] In one embodiment, please refer to Figure 5 and Figure 6 The first groove 121 includes two pressure monitoring chambers 121d, one of which is arranged upstream of the first brake chamber 121b, and the other is arranged downstream of the second brake chamber 121c. The first component 11 is provided with two fourth holes 11d corresponding to the two pressure monitoring chambers 121d, and the pressure monitoring device 26 is in contact with the side of the first elastic diaphragm 14 away from the pressure monitoring chamber 121d through the fourth hole 11d.

[0058] See 1 and Figure 2The pump body 2 includes two pressure monitoring devices 26 arranged on the pump head frame 28, one of which is arranged on the side of the first brake valve column assembly 22 away from the plunger assembly 21, and the other is arranged on the side of the second brake valve column assembly 23 away from the plunger assembly 21. The plunger assembly 21, the first brake valve column assembly 22, the second brake valve column assembly 23, and the two pressure monitoring devices 26 are arranged in a straight line. Since the pressure monitoring device 26 abuts against the side of the first elastic diaphragm 14 facing away from the pressure monitoring chamber 121d, the pressure monitoring device 26 can monitor the pressure value of the liquid in the flow channel 1a according to the reaction force of the first elastic diaphragm 14. It can thereby determine whether the pressure is abnormal, blocked, or the bottle is empty. In the embodiment of the present application, the provision of two pressure monitoring devices 26 and the pressure monitoring chamber 121d can improve the reliability of pressure monitoring and minimize the possibility of misjudgment of infusion line blockage.

[0059] It should be noted that there may be only one pressure monitoring device 26 and only one pressure monitoring chamber 121d.

[0060] In other embodiments, in addition to the plunger assembly 21 , the first brake assembly 22 and the second brake assembly 23 being arranged in a straight line, the two pressure monitoring devices 26 may not be arranged in a straight line with the plunger assembly 21 , the first brake assembly 22 and the second brake assembly 23 .

[0061] In one embodiment, please refer to Figure 5 The pressure monitoring chamber 121d located downstream of the second brake chamber 121c is arranged at the end of the first groove 121 along the liquid flow direction, that is, at the junction of the first groove 121 and the second groove 122, which can make the structure more compact.

[0062] In one embodiment, the pump body 2 further includes an ultrasonic bubble monitoring device 27 to monitor the presence of bubbles in the liquid in the flow channel 1a. The number of ultrasonic bubble monitoring devices 27 can be one or more, and is not limited herein. In this embodiment, the ultrasonic bubble monitoring device 27 is disposed between the second brake valve spool assembly 23 and the pressure monitoring device 26.

[0063] The specific structure of the power unit 25 is not limited. In one embodiment, please refer to Figure 2 The power unit 25 includes a motor 251 and a transmission mechanism 252, which is connected between the rotating shaft of the motor 251 and the camshaft 24. The transmission mechanism 252 can be a chain, a belt, or a gear set that is meshed with each other. In the embodiment of the present application, the transmission mechanism 252 is a gear set that includes at least two gears, one of which is coaxially arranged with the camshaft 24, and the other gear is coaxially arranged with the rotating shaft. The two gears can be directly meshed with each other or indirectly transmitted through other intermediate gears.

[0064] The transmission mechanism 252 can be a single-stage transmission or a multi-stage transmission, etc., which is not limited here.

[0065] In one embodiment, please refer to Figure 4 and Figure 5 The infusion cartridge 1 further includes a third member 13, a second elastic diaphragm 15, and a locking mechanism 16. A second groove 122 is provided on a second side of the second member 12 facing away from the first member 11. A portion of the second member 12 is recessed to form the second groove 122, which is open toward the third member 13. Specifically, the first groove 121 and the second groove 122 are located on opposite sides of the second member 12. The second groove 122 is connected to the first groove 121 and is located downstream of the first groove 121.

[0066] Please continue reading Figure 5 , the second elastic diaphragm 15 is arranged between the second component 12 and the third component 13 to sealably cover the second groove 122, and the second elastic diaphragm 15 and the second groove 122 cooperate to form another part 1a″ of the flow channel 1a. That is, the flow channel 1a will pass through from the first side of the first component 11 to the second side of the first component 11, and the liquid will flow from the first side of the second component 12 to the second side of the second component 12. The locking mechanism 16 includes a mounting bracket 161 and a liquid stopper 162 fixedly arranged on the mounting bracket 161, that is, the mounting bracket 161 and the liquid stopper 162 move synchronously, and the liquid stopper 162 can squeeze the second elastic diaphragm 15 to close the flow channel 1a. Specifically, the third A bypass hole 13a is formed on the component 13, and the liquid-stopping plug 162 can squeeze the second elastic diaphragm 15 through the bypass hole 13a to close the flow channel 1a. The liquid-stopping plug 162 passes through the bypass hole 13a from the side of the third component 13 facing away from the second component 12, and abuts the second elastic diaphragm 15 against the second groove 122 of the second component 12 or against the peripheral wall of the flow hole 122a at the end of the second groove 122. The second elastic diaphragm 15 blocks the other part 1a″ of the flow channel 1a, and the liquid cannot flow in the other part 1a″ of the flow channel 1a, thereby achieving the closure of the entire flow channel 1a. In other words, the locking mechanism 16 closes or opens the flow channel 1a″ through the liquid-stopping plug 162.

[0067] The first elastic membrane 14 must meet the biocompatibility requirements specified in relevant standards and be made of a material with good extrusion resistance and desired elasticity, such as silicone. The material of the first elastic membrane 14 and the second elastic membrane 15 can be the same or different, and there is no limitation here.

[0068] The mounting bracket 161 is movably connected to the first component 11 , the second component 12 and the third component 13 so that the locking mechanism 16 can be switched between a closed state for closing the flow channel 1 a and an open state for opening the flow channel 1 a .

[0069] It should be noted that the locking mechanism 16 closes or opens the flow channel 1a through the liquid stopper 162 , and the movement of the mounting frame 161 relative to the first component 11 , the second component 12 and the third component 13 can change the degree to which the liquid stopper 162 squeezes the second elastic diaphragm 15 .

[0070] In the infusion cartridge 1 of the present embodiment, the stopper 162 is positioned on the side of the third member 13 facing away from the second member 12, thereby preventing interference between the locking mechanism 16 and the second brake valve column assembly 23. Specifically, if the stopper 162 is positioned on the side of the first member 11 facing the pump body 2, either the locking mechanism 16 is positioned close to the second brake valve column assembly to achieve a compact structure, but if the two are too close together, they will interfere with each other. Alternatively, to avoid interference, the distance between them is increased, which would necessitate extending the length of the infusion cartridge 1 and the pump body 2, increasing the size of the infusion pump. While the slightly larger size of conventional infusion pumps commonly used for fixed-site infusions has relatively little impact on ease of use, as portable analgesia pumps, their size should be as compact as possible.

[0071] In addition, the structural form of the second elastic diaphragm 15 and the third component 13 is easy to manufacture and assemble, and can also make the structure more compact; similar to the first elastic diaphragm 14, when squeezed, the second elastic diaphragm 15 will basically not have unexpected displacement, and the end of the liquid-stop plug 162 is set to a circular arc surface, and the shape of the corresponding position of the second groove 122 that is squeezed and matched with the liquid-stop plug 162 is adapted to the end face of the liquid-stop plug. In this way, the liquid-stopping effect is good, and the manufacturing error of the liquid-stop plug 162 can be relaxed.

[0072] In one embodiment, a portion of the mounting bracket 161 protrudes from the side of the first member facing the pump body 2. In other words, the mounting bracket 161 passes through the first member 11, the second member 12, and the third member 13. A portion of the mounting bracket 161 is located on the side of the third member 13 facing away from the second member 12, and another portion of the mounting bracket 161 is located on the side of the first member 11 facing the pump body 2.

[0073] The open state includes a first open state. When the infusion cassette 1 and the pump body 2 are assembled, the pump head frame 28 of the pump body 2 forces the mounting frame 161 to move toward the third member 13 to drive the locking mechanism 16 to switch from the closed state to the first open state and maintain it in the first open state. In other words, when the infusion cassette 1 and the pump body 2 are assembled, the pump head frame 28 of the pump body 2 can ensure that the locking mechanism 16 is in the first open state. In one embodiment, please refer to Figure 4 The locking mechanism 16 further includes an elastic member 17 , which applies a force to the mounting bracket 161 so that the locking mechanism 16 can remain in a closed state of closing the flow channel 1 a .

[0074] When the infusion cassette 1 is separated from the pump body 2, the elastic member 17 drives the locking mechanism 16 to switch from the first open state to the closed state and maintain it in the closed state. That is, when the infusion cassette 1 and the pump body 2 are separated, the default position of the locking mechanism 16 is the closed state. Under the action of the elastic member 17, the locking mechanism 16 remains relatively stable in the closed state, preventing the liquid in the infusion cassette from flowing freely. For example, in some applications, if the liquid medicine flows unintended, it may cause environmental damage or injure patients or medical staff. When the infusion cassette 1 is combined with the pump body 2, the default state of the infusion cassette 1 is the open flow channel 1a, that is, the locking mechanism 16 is in the open state. At this time, the liquid in the flow channel 1a is automatically transferred to the control of the plunger assembly 21, the first brake valve column assembly 22, and the second brake valve column assembly 23 of the pump body 2.

[0075] The specific structural type of the elastic member 17 is not limited, for example, a tension spring, a compression spring, a torsion spring or other elastic members. In the embodiment of the present application, the elastic member 17 is a torsion spring.

[0076] In one embodiment, the open state further includes a second open state. Figure 7 The locking mechanism 16 includes a latch structure 1614 disposed on the mounting bracket 161. At least one of the first component 11, the second component 12, and the third component 13 can engage with the latch structure 1614 to lock the locking mechanism 16 in the second open state. It should be noted that in both the first and second open states, the flow channel 1a is open, allowing liquid to continue flowing through the flow channel 1a. For example, the second open state is often used to remove air from the infusion set before infusion.

[0077] When the pump body 2 is separated from the infusion cassette 1 and the locking mechanism 16 needs to be kept in the state of opening the flow channel 1 a , the latch structure 1614 can be locked. At this time, the locking mechanism 16 is locked in the current second open state.

[0078] In one embodiment, please refer to Figure 4 The infusion box 1 has two through holes 1d that pass through the infusion box 1 along the thickness direction, and the flow channel 1a is located between the two through holes 1d. Figure 7 The mounting frame 161 includes a cross bar 1612, a connecting rod 1611 and a sliding rod 1613. A sliding rod 1613 is provided in each through hole 1d. The connecting rod 1611 is provided on the side of the first component 11 facing the pump body 2, and the cross bar 1612 is provided on the side of the third component 13 away from the second component 12. The first ends of the two sliding rods 1613 are connected to the connecting rod 1611, and the second ends of the two sliding rods 1613 are connected to the cross bar 1612. The liquid stopper 162 is provided on the cross bar 1612.

[0079] During the assembly of the pump body 2 and the infusion box 1 , the pump body 2 pushes the connecting rod 1611 toward the third component 13 , and the connecting rod 1611 drives the entire locking mechanism 16 to move synchronously. During the movement, the liquid stopper 162 gradually separates from the second elastic diaphragm 15 .

[0080] It should be noted that the connecting rod 1611 and the cross bar 1612 are of a separate structure, that is, the connecting rod 1611 and the cross bar 1612 are not integrally formed, so as to facilitate the passage of the sliding rod 1613 through the through hole 1d. Specifically, the connecting rod 1611 and the two sliding rods 1613 can be integrally formed, such as an integrally formed injection molded part; or the cross bar 1612 and the two sliding rods 1613 can be integrally formed, such as an integrally formed injection molded part.

[0081] In the embodiment of the present application, description is made by taking the connecting rod 1611 and the two sliding rods 1613 as an integrally formed structure as an example.

[0082] For example, the sliding rod 1613 is connected to the cross bar 1612. In one embodiment, please continue to refer to Figure 4 Crossbar 1612 is provided with connecting holes 1612a at opposite ends thereof. These connecting holes 1612a can be blind holes or through holes, without limitation. The second end of sliding rod 1613 is fixedly disposed within connecting hole 1612a. For example, sliding rod 1613 is disposed within connecting hole 1612a and then bonded or ultrasonically welded to the inner wall of connecting hole 1612a. Alternatively, sliding rod 1613 and connecting hole 1612a are interference-fitted, with frictional force securing the connection.

[0083] In order to facilitate the rapid positioning of the crossbar 1612 during the assembly process, in one embodiment, please continue to refer to Figure 4 The circumferential surface of the second end of the sliding rod 1613 is provided with a stepped surface 1613a, and the cross bar 1612 abuts against the stepped surface 1613a. During assembly, it is only necessary to align the connecting hole 1612a on the cross bar 1612 with the sliding rod 1613, push the cross bar 1612 toward the sliding rod 1613 until the cross bar 1612 abuts against the stepped surface 1613a, and then adhere them. The stepped surface 1613a allows for quick assembly of the cross bar 1612 and the sliding rod 1613, and can also ensure the relative position of the cross bar 1612 and the sliding rod 1613, thereby improving the batch consistency of the product.

[0084] In one embodiment, please refer to Figure 7The latching structure 1614 protrudes from the surface of the sliding rod 1613 and is located on the side of one sliding rod 1613 facing away from the other sliding rod 1613. It is understood that the latching structure 1614 can be provided on one sliding rod 1613 or on both sliding rods 1613. The embodiment of the present application is described by taking the latching structure 1614 provided on both sliding rods 1613 as an example.

[0085] The specific structure of the latch structure 1614 is not limited. For example, in the embodiment of the present application, the latch structure 1614 is substantially in the shape of a sheet extending along the length direction of the sliding rod 1613 .

[0086] See also Figure 4 In one embodiment, a sliding groove 1f is formed on the wall surface corresponding to the through-hole 1d, and the latching structure 1614 slides linearly with the sliding groove 1f along the thickness direction of the infusion cartridge 1. In other words, the latching structure 1614 can slide back and forth in the sliding groove 1f along the thickness direction of the infusion cartridge 1. A stop portion 110 is formed on the first component 11, protruding toward the avoidance hole. When the locking mechanism 16 moves toward the third component 13 until the latching structure 1614 no longer interferes with the stop portion 110, the locking mechanism 16 can swing along the length direction of the infusion cartridge 1, and the latching structure 1614 slides into the sliding groove 1f. The latching structure 1614 abuts against the side of the stop portion 110 facing the second component 12, thereby locking the locking mechanism 16 in the second open state.

[0087] In one embodiment, part of the structure of the mounting bracket 161 protrudes from the side of the first component 11 facing the pump body 2; a protrusion 281 for pushing the mounting bracket 161 is formed on the side of the pump head bracket 28 facing the infusion cassette 1, and an inclined surface 281a is formed on the end of the protrusion 281 facing one end of the infusion cassette 1; during the assembly process of the infusion cassette 1 and the pump body 2, the inclined surface 281a pushes the mounting bracket 28 toward the third component 13 to fix the locking mechanism 16 in the first open state.

[0088] The inclined surface 281a serves to position the mounting bracket 28. When the infusion cassette 1 and the pump body 2 are assembled, the inclined surface 281a abuts against the mounting bracket 161, preventing the mounting bracket 161 from moving along the thickness direction of the infusion cassette 1 or swinging along the length direction of the infusion cassette 1. In other words, the locking mechanism 16 is fixed in its current position and cannot be displaced, thereby improving the working reliability of the locking mechanism 16.

[0089] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0090] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An infusion pump, comprising a pump body (2) and an infusion set, wherein the infusion set comprises an infusion box (1) and an infusion tube (3) connected to the infusion box (1), wherein the pump body (2) and the infusion box (1) are detachably matched, and wherein: The infusion box (1) has a flow channel (1a), and the infusion box (1) includes a first component (11), a second component (12) and a first elastic diaphragm (14); the second component (12) is formed with a first groove (121) on a side facing the first component (11); the first elastic diaphragm (14) is arranged between the first component (11) and the second component (12) to sealably cover the first groove (121); the first elastic diaphragm (14) and the first groove (121) together constitute at least a part of the flow channel (1a); the first groove (121) includes a pump chamber (121a), a first brake chamber (121b) located upstream of the pump chamber (121a), and a second brake chamber (121c) located downstream of the pump chamber (121a); ​​the pump chamber (121a), the first brake chamber (121b) and the second brake chamber (121c) are arranged in a straight line; The pump body (2) is arranged on a side of the first component (11) away from the second component (12), and the pump body (2) includes a pump head frame (28), a cam shaft (24) rotatably arranged on the pump head frame (28), a plunger assembly (21) pressed and matched with the pump chamber (121a), a first brake valve column assembly (22) pressed and matched with the first brake chamber (121b), a second brake valve column assembly (23) pressed and matched with the second brake chamber (121c), and a driving mechanism for driving the cam shaft (24). ) rotates the power unit (25), the ends of the plunger assembly (21), the first brake valve column assembly (22) and the second brake valve column assembly (23) are all in sliding contact with the rotating surface of the camshaft (24), and the camshaft (24) drives the plunger assembly (21), the first brake valve column assembly (22) and the second brake valve column assembly (23) to sequentially peristaltically squeeze the first elastic diaphragm (14) during the rotation process to cause the liquid in the flow channel (1a) to produce a directional flow.

2. The infusion pump according to claim 1, characterized in that The first brake valve column assembly (22) and the second brake valve column assembly (23) squeeze the first elastic diaphragm (14) in a full squeezing manner; and the plunger assembly (21) squeezes the first elastic diaphragm (14) in a half squeezing manner.

3. The infusion pump according to claim 1, characterized in that The end face of the plunger assembly (21) used to squeeze the first elastic diaphragm (14) is an arc surface, and the shape of the pump chamber (121a) is adapted to the shape of the end face of the plunger assembly (21); and / or, the end face of the first brake valve column assembly (22) used to squeeze the first elastic diaphragm (14) is an arc surface, and the shape of the first brake chamber (121b) is adapted to the shape of the end face of the first brake valve column assembly (22); and / or, the end face of the second brake valve column assembly (23) used to squeeze the first elastic diaphragm (14) is an arc surface, and the shape of the second brake chamber (121c) is adapted to the shape of the end face of the second brake valve column assembly (23).

4. The infusion pump according to claim 1, characterized in that: The infusion box (1) is provided with a liquid inlet (1b) at a first end along the length direction, and a liquid outlet (1c) at a second end along the length direction. In a projection in a plane perpendicular to the thickness direction of the infusion box (1), the flow channel (1a), the liquid inlet (1b) and the liquid outlet (1c) are arranged in a straight line.

5. The infusion pump according to claim 1, characterized in that: The power unit (25) includes a motor (251) and a transmission mechanism (252), wherein the transmission mechanism (252) is connected between the rotating shaft of the motor (251) and the camshaft (24).

6. The infusion pump according to claim 1, characterized in that: The infusion box (1) further comprises a third member (13), a second elastic diaphragm (15) and a locking mechanism (16); a second groove (122) is formed on a side of the second member (12) facing away from the first member (11); the second groove (122) is communicated with the first groove (121) and is located downstream of the first groove (121); the second elastic diaphragm (15) is arranged between the second member (12) and the third member (13) to sealably cover the second groove (122); The locking mechanism (16) comprises a mounting frame (161) and a liquid-stopping plug (162) fixedly arranged on the mounting frame (161); the liquid-stopping plug (162) is capable of squeezing the second elastic diaphragm (15) to close the flow channel (1a); and the locking mechanism (16) is capable of switching between a closed state for closing the flow channel (1a) and an open state for opening the flow channel (1a).

7. The infusion pump according to claim 6, characterized in that: The open state includes a first open state; when the infusion box (1) and the pump body (2) are combined, the pump head frame (28) forces the mounting frame (161) to move toward the third component (13) to drive the locking mechanism (16) to switch from the closed state to the first open state and maintain in the first open state.

8. The infusion pump according to claim 7, characterized in that: The infusion box (1) comprises an elastic member (17), and the elastic member (17) applies a force to the mounting frame (161) so that the locking mechanism (16) can be maintained in a closed state closing the flow channel (1a).

9. The infusion pump according to claim 8, characterized in that: When the infusion box (1) is separated from the pump body (2), the elastic member (17) drives the locking mechanism (16) to switch from the first open state to the closed state and remain in the closed state.

10. The infusion pump according to claim 7, characterized in that: The open state includes a second open state, and the locking mechanism (16) includes a latching structure (1614) arranged on the mounting frame (161); at least one of the first component (11), the second component (12) and the third component (13) is locked with the latching structure (1614) so ​​that the locking mechanism (16) can enter the second open state and remain in the second open state.

11. The infusion pump according to claim 7, characterized in that: Part of the structure of the mounting frame (161) protrudes from the side of the first component (11) facing the pump body (2); a boss (281) for pushing the mounting frame (161) is formed on the side of the pump head frame (28) facing the infusion box (1), and an inclined surface (281a) is formed at the end of the boss (281) facing one end of the infusion box (1); during the combination of the infusion box (1) and the pump body (2), the inclined surface (281a) pushes the mounting frame (161) to move toward the direction of the third component (13) to fix the locking mechanism (16) in the first open state.

12. The infusion pump according to claim 1, characterized in that: The first groove (121) includes two pressure monitoring chambers (121d), one of which is arranged upstream of the first brake chamber (121b), and the other is arranged downstream of the second brake chamber (121c). The pump body (2) includes two pressure monitoring devices (26) arranged on the pump head frame (28), one of which is arranged on the side of the first brake valve column assembly (22) away from the plunger assembly (21), and the other is arranged on the side of the second brake valve column assembly (23) away from the plunger assembly (21). The plunger assembly (21), the first brake valve column assembly (22), the second brake valve column assembly (23), and the two pressure monitoring devices (26) are arranged in a straight line.

13. The infusion pump according to claim 12, characterized in that: The pressure monitoring chamber (121d) located downstream of the second braking chamber (121c) is provided at the end of the first groove (121) along the liquid flow direction.

14. The infusion pump according to claim 1, characterized in that The camshaft (24) is capable of forward and reverse rotation. When the camshaft (24) rotates forward, the camshaft (24) drives the plunger assembly (21), the first brake valve column assembly (22), and the second brake valve column assembly (23) to creep in a forward sequence to drive the liquid in the flow channel to flow forward; when the camshaft (24) rotates reversely, the camshaft (24) drives the plunger assembly (21), the first brake valve column assembly (22), and the second brake valve column assembly (23) to creep in a reverse sequence to drive the liquid in the flow channel to flow reversely.

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