Infusion cassette of an infusion set, infusion set and infusion pump

Abstract

The application provides an infusion cassette of an infusion device, the infusion device and an infusion pump. The infusion cassette has a flow channel. The infusion cassette comprises a rigid assembly, an elastic diaphragm and a locking mechanism. The rigid assembly comprises a plurality of components stacked together. At least one of the components is provided with a groove. The elastic diaphragm is arranged between two adjacent components to seal the groove. The locking mechanism comprises a mounting frame and a liquid stopper fixed to the mounting frame. The liquid stopper can press the elastic diaphragm to close the flow channel. The locking mechanism closes or opens the flow channel through the liquid stopper. The mounting frame is movably connected to a main frame to enable the locking mechanism to switch between a closed state of closing the flow channel and an open state of opening the flow channel. The infusion cassette has high machining precision, simple assembly and small assembly error because the rigid assembly and the elastic diaphragm are injection molded parts. The possibility of unexpected displacement and swing of the elastic diaphragm is small. The infusion cassette can prevent excessive infusion and environmental hazards caused by liquid flow.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an infusion set, an infusion cartridge, an infusion set, and an infusion pump. Background Technology

[0002] In clinical practice, fluids often need to be delivered to patients with great precision, which gravity-fed infusion devices often cannot meet. Instead, infusion pumps are used to regulate the dosage and rate of fluid delivery for precise infusion. Therefore, infusion pumps have become increasingly widely used in recent years, and various types have emerged, such as infusion pumps for general infusions, portable analgesic infusion pumps for pain relief, and infusion pumps for blood transfusions and chemotherapy.

[0003] In infusion pump technology, the flow of liquid within the infusion set is controlled by the peristaltic squeezing of the pump body against the tubing. One type of infusion pump uses peristaltic plates to sequentially and rigidly squeeze the PVC tubing of the infusion set to control the flow. However, the PVC tubing is prone to rupture and leakage due to repeated squeezing by the peristaltic plates, and this type of pump is relatively large and heavy. Another type of infusion pump uses peristaltic fingers to sequentially squeeze a flexible silicone tube installed within the infusion cartridge to control the flow of liquid. The two ends of the silicone tube are relatively fixed, while the remaining portion between the ends is roughly horizontally arranged along the squeezing plate and is in a relatively free state. Generally, the peristaltic movement of the pump body's peristaltic fingers may cause random displacement and oscillation of the silicone tubing. Such displacement and oscillation can negatively impact infusion accuracy to some extent. Simultaneously, differences in tubing length and the gap between the tubing and the extrusion plate during assembly can also affect infusion accuracy. Furthermore, this type of infusion pump places high demands on the fit clearance between the pump body's peristaltic fingers and the fixing holes of the peristaltic finger frame. If the clearance is too large, the peristaltic fingers may oscillate and fail to accurately press the silicone tubing to the intended position. If the clearance is too small, friction may easily occur between the peristaltic fingers and the fixing holes of the peristaltic finger frame, affecting the pump head's lifespan and reducing the peristaltic finger torque.

[0004] Generally, when an infusion set's tubing is connected to the liquid container, and the infusion cartridge or tubing is combined with the pump body, the peristaltic fingers on the pump head can squeeze the silicone tubing inside the PVC infusion tubing or infusion cartridge to control the free flow of liquid within the infusion set. However, when the PVC infusion tubing or infusion cartridge is separated from the pump body, without a matching stopper device, the liquid inside the infusion set often flows out freely under the influence of gravity. This free flow is uncontrolled and poses significant risks and inconveniences in some clinical applications. Summary of the Invention

[0005] In view of this, the embodiments of this application aim to provide an infusion cartridge, infusion set, and infusion pump that are highly accurate and easy to manufacture.

[0006] To achieve the above objectives, a first aspect of this application provides an infusion cartridge for an infusion set, the infusion cartridge having a flow channel, the infusion cartridge comprising:

[0007] A rigid component, the rigid component comprising a plurality of stacked components, at least one of the components having a groove;

[0008] An elastic diaphragm is disposed between two adjacent components to sealably cover the groove, the elastic diaphragm and the groove together forming at least a portion of the flow channel;

[0009] A locking mechanism includes a mounting bracket and a stop plug fixedly disposed on the mounting bracket. The stop plug can squeeze the elastic diaphragm to close the flow channel. The locking mechanism closes or opens the flow channel through the stop plug. The mounting bracket is movably connected to the main frame so that the locking mechanism can switch between a closed state where the flow channel is closed and an open state where the flow channel is open.

[0010] In some embodiments, the component includes a first component, a second component, and a third component; the groove includes a first groove and a second groove; the elastic diaphragm includes a first elastic diaphragm and a second elastic diaphragm; the second component is disposed between the first component and the third component; the second component has the first groove on its side facing the first component; the first elastic diaphragm is disposed between the first component and the second component to sealably cover the first groove; the second component has a second groove formed on its side facing away from the first component; the second groove communicates with the first groove and is located downstream of the first groove; the second elastic diaphragm is disposed between the second component and the third component to sealably cover the second groove; the stop plug is disposed on the side of the third component facing away from the second component, and the stop plug compresses the second elastic diaphragm to close the flow channel.

[0011] In some embodiments, the infusion cartridge includes an elastic element that applies a force to the mounting bracket to allow the locking mechanism to remain in a closed state, closing the flow channel.

[0012] In some implementations, the open state includes a first open state, in which the locking mechanism remains in the first open state under the action of an external force; when the external force disappears or the elastic force of the elastic element can overcome the force exerted by the external force on the locking mechanism, the elastic element drives the locking mechanism to automatically switch from the first open state to the closed state.

[0013] In some implementations, the open state includes a second open state, and the locking mechanism includes a bolt-locking structure disposed on the mounting bracket; the bolt-locking structure is selectively engaged with the rigid component to lock the locking mechanism in the second open state.

[0014] In some embodiments, the rigid component is provided with two through holes extending through the rigid component along its thickness direction, and the flow channel is located between the two through holes; the mounting bracket includes a crossbar, a connecting rod, and a sliding rod, and each of the through holes is provided with a sliding rod; the connecting rod and the crossbar are provided on opposite sides of the rigid component along its thickness direction; the first ends of the two sliding rods are connected to the connecting rod, the second ends of the two sliding rods are connected to the crossbar, and the stop plug is provided on the crossbar.

[0015] In some implementations, the crossbar has two connecting holes, and the second end of the sliding rod is fixedly inserted into the connecting holes.

[0016] In some implementations, the circumferential surface of the second end of the sliding rod is provided with a stepped surface, and the crossbar abuts against the stepped surface.

[0017] In some embodiments, the locking structure protrudes from the surface of the sliding rod, and a groove is formed on the wall surface corresponding to the through hole; a stop portion protruding toward the through hole is formed on the first component; when the sliding rod slides to a position where the locking structure does not interfere with the stop portion, the locking mechanism can swing along the length direction of the infusion cartridge, and the locking structure slides into the groove and abuts against the side of the stop portion facing the second component, so that the locking mechanism is locked in the second open state.

[0018] In some implementations, the flow channel extends in a straight line in a projection perpendicular to the thickness direction of the infusion cartridge.

[0019] A second aspect of this application provides an infusion pump, including multiple infusion tubing segments and any of the above-mentioned infusion cartridges. The infusion cartridge has an inlet and an outlet, wherein one segment of the infusion tubing is connected to the inlet, and another segment of the infusion tubing is connected to the outlet. The infusion tubing is in communication with the flow channel.

[0020] A third aspect of this application provides an infusion pump, including a pump body and any of the infusion sets described above. When the infusion cartridge is combined with the pump body, the pump body can drive the locking mechanism to switch from a closed state to an open state and remain in the open state. When the infusion cartridge is separated from the pump body, the locking mechanism can automatically switch from the open state to the closed state.

[0021] In this embodiment of the infusion box, each component of the rigid assembly is a rigid injection molded part, while the elastic diaphragm is a flexible injection molded part. The injection molded parts have high manufacturing precision, simple assembly, small assembly error, and good product consistency. In addition, the elastic diaphragm is disposed between two adjacent components, so the possibility of the elastic diaphragm undergoing unexpected displacement or swaying when squeezed is very small. The locking mechanism selectively closes the flow channel, which can prevent the liquid in the infusion box from flowing out by itself, avoiding excessive infusion or dripping of medicine caused by liquid flow and thus avoiding environmental harm. Furthermore, the first elastic diaphragm itself has good compression resistance, so the risk of damage and leakage when repeatedly squeezed is very low. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an infusion box according to an embodiment of this application;

[0023] Figure 2 for Figure 1 Exploded view of the structure shown;

[0024] Figure 3 for Figure 1 The diagram shows the structure of the second component.

[0025] Figure 4 for Figure 1 The diagram shows the structure of the locking mechanism.

[0026] Figure 5 for Figure 1 The cross-sectional view of the infusion box shown;

[0027] Figure 6 This is a schematic diagram of the structure of an infusion pump according to an embodiment of this application, wherein the pump body and the infusion tank are in a separated state;

[0028] Figure 7 for Figure 6 The diagram shows a combination of infusion pumps, with some structures shown in cross-section.

[0029] Explanation of reference numerals in the attached figures

[0030] Infusion box 1; rigid component 10; first component 11; second component 12; third component 13; first elastic diaphragm 14; second elastic diaphragm 15; stop part 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 braking chamber 121b; second braking chamber 121c; pressure monitoring chamber 121d; flow channel 1a; inlet 1b; outlet 1c; through hole 1d; slide groove 1f; clearance hole 13a; Locking mechanism 16; mounting bracket 161; connecting rod 1611; crossbar 1612; sliding rod 1613; stepped surface 1613a; bolt-locking structure 1614; stop plug 162; connecting hole 1612a; elastic element 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; protruding post 281; inclined surface 281a; infusion tube 3 Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0032] In the description of the embodiments of this application, the orientation or positional relationship of "thickness direction" and "length direction" is based on the appendix. Figure 5 The orientations or positional relationships shown are intended only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] This application provides an infusion pump; please refer to [link / reference]. Figure 6 The infusion pump includes a pump body 2 and an infusion set.

[0034] The infusion set includes an infusion cartridge 1 and multiple infusion tubing 3 connected to the infusion cartridge 1. It is understood that in some embodiments, the infusion set may also include other accessories disposed on the infusion tubing 3.

[0035] Please see Figure 5 The infusion box 1 has an inlet 1b, an outlet 1c, and a flow channel 1a communicating with the inlet 1b and the outlet 1c. One end of an infusion tube 3 is connected to the inlet 1b, and the other end of the infusion tube 3 is connected to the outlet 1c. The infusion tube 3 is also communicating with the flow channel 1a.

[0036] Please see Figure 2The infusion cartridge 1 includes a rigid component 10 and an elastic diaphragm. The rigid component 10 includes a plurality of stacked members, at least one of which has a groove; the elastic diaphragm is disposed between two adjacent members to seal over the groove, and the elastic diaphragm and the groove together form at least a portion of the flow channel.

[0037] In this embodiment, based on the flow channel structure formed by the elastic diaphragm and the groove, the infusion box 1 also includes a locking mechanism 16 to prevent uncontrolled free flow of liquid in the infusion set, which could lead to excessive infusion or environmental harm.

[0038] The locking mechanism 16 includes a mounting bracket 161 and a stop plug 162 fixedly mounted on the mounting bracket 161, meaning that the mounting bracket 161 and the stop plug 162 move synchronously. The stop plug 162 can compress the elastic diaphragm 15 to close the flow channel 1a. The locking mechanism 16 closes or opens the flow channel 1a through the stop plug 162. The mounting bracket 161 is movably connected to the rigid component 10 so that the locking mechanism 16 can switch between a closed state of closing the flow channel 1a and an open state of opening the flow channel 1a.

[0039] It should be noted that the locking mechanism 16 achieves the function of closing or opening the flow channel 1a through the liquid stop plug 162, and the position of the liquid stop plug 162 can be changed by the movement of the mounting bracket 161 relative to the rigid component 10 of the main structure.

[0040] Please see Figure 3 In one embodiment, the groove 121 includes a pump chamber 121a, a first braking chamber 121b located upstream of the pump chamber 121a, and a second braking chamber 121c located downstream of the pump chamber 121a.

[0041] In one embodiment, the pump body 2 is disposed on the side of the first component 11 opposite to the second component 12. See also... Figure 6 The pump body 2 includes a pump head frame 28, a camshaft 24 rotatably mounted on the pump head frame 28, a plunger assembly 21 that compresses with the pump chamber 121a, a first brake valve assembly 22 that compresses with the first brake chamber 121b, a second brake valve assembly 23 that compresses with the second brake chamber 121c, and a power unit 25 that drives the camshaft 24 to rotate. The ends of the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 are all in sliding contact with the rotating surface of the camshaft 24. During rotation, the camshaft 24 drives the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 to sequentially peristalt and compress the elastic diaphragm, thereby causing the liquid in the flow channel 1a to flow in a directional manner.

[0042] In this embodiment of the infusion box, each component of the rigid assembly 10 is a rigid injection molded part, while the elastic diaphragm is a flexible injection molded part. The injection molded parts have high manufacturing precision, simple assembly, small assembly error, and good product consistency. In addition, the elastic diaphragm 14 is disposed between two adjacent components. When the elastic diaphragm is squeezed by the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23, the possibility of the elastic diaphragm undergoing unexpected displacement and oscillation is very small. Furthermore, the ends of the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 used to squeeze the elastic diaphragm can be made into arc surfaces, and the shapes of the pump chamber 121a, the first brake chamber 121b, and the second brake chamber 121c that cooperate with them can be adapted to the arc surfaces. During compression, the end shape of the plunger assembly 21 adapts to the shape of the pump chamber 121a, the end shape of the first brake valve assembly 22 adapts to the shape of the first brake chamber 121b, and the end shape of the second brake valve assembly 23 adapts to the shape of the second brake chamber 121c. This reduces the clearance machining requirements of the mounting holes on the pump head frame 28 used to accommodate the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23, and also provides good liquid-stopping effect, allowing for more lenient manufacturing tolerances for the liquid-stopping plug 162. Furthermore, the elastic diaphragm itself has excellent compression resistance, and the end faces of the plunger 21, the first brake valve assembly 22, and the second brake valve assembly 23 are arc-shaped, thus the risk of breakage and leakage during repeated compression is very low.

[0043] The infusion pump of this application embodiment can be widely used in various scenarios such as routine infusion, analgesia, blood transfusion, and chemotherapy.

[0044] In one embodiment, the first braking chamber 121b, the pump chamber 121a, and the second braking chamber 121c are arranged sequentially at intervals along the liquid flow direction.

[0045] The number of components can be two or more. The number of elastic diaphragms can be one or more. In one embodiment, the components include a first component 11, a second component 12, and a third component 13; the groove includes a first groove 121 and a second groove 122; the elastic diaphragms include a first elastic diaphragm 14 and a second elastic diaphragm 15; the second component 12 is disposed between the first component 11 and the third component 13; the first groove 121 is provided on the side of the second component 12 facing the first component 11. Specifically, a partial structural recess of the second component 12 forms the first groove 121, which is open towards the first component 11. The first elastic diaphragm 14 is disposed between the first component 11 and the second component 12 to sealably cover the first groove 121. Please refer to [reference needed]. Figure 5 The first elastic diaphragm 14 and the first groove 121 cooperate to form a part 1a′ of the flow channel 1a.

[0046] A second groove 122 is formed on the side of the second component 12 opposite to the first component 11. The second groove 122 is formed by a partial structural recess in the second component 12 and is open towards the third component 13. The second groove 122 communicates with and is located downstream of the first groove 121. That is, the flow channel 1a extends from the first side of the first component 11 to the second side of the first component 11, and liquid flows from the first side of the second component 12 to the second side of the second component 12. A second elastic diaphragm 15 is disposed between the second component 12 and the third component 13 to sealably cover the second groove 122. (See also...) Figure 5 The second elastic diaphragm 15 and the second groove 122 cooperate to form another part 1a″ of the flow channel 1a. The liquid stopper 162 is disposed on the side of the third member 13 away from the second member 12, and the liquid stopper 162 squeezes the second elastic diaphragm 15 to close the other part 1a″ of the flow channel 1a.

[0047] Specifically, please refer to Figure 2 The first component 11 has 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. The plunger assembly 21 can squeeze the first elastic diaphragm 14 after passing through the first hole 11a. The first brake valve column assembly 22 can squeeze the first elastic diaphragm 14 after passing through the second hole 11b. The second brake valve column assembly 23 can squeeze the second elastic diaphragm 15 after passing through the third hole 11c.

[0048] Specifically, a clearance hole 13a is formed on the third component 13. The liquid stop plug 162 passes through the clearance hole 13a from the side of the third component 13 away from the second component 12, and abuts the second elastic diaphragm 15 against the second groove 122 of the second component 12. Liquid cannot flow in the other part 1a″ of the flow channel 1a, thus closing the flow channel 1a. In other words, the locking mechanism 16 closes or opens the flow channel 1a through the liquid stop plug 162.

[0049] In one embodiment, please refer to Figure 5 A flow hole 122a is formed at the end of the second groove 122. The stop plug 162 squeezes the second elastic diaphragm 15 to the periphery of the flow hole 122a, thereby achieving the purpose of closing the flow channel 1a.

[0050] In this embodiment of the infusion cartridge 1, the stop plug 162 is disposed on the side of the third component 13 away from the second component 12, which can prevent interference between the locking mechanism 16 and the second brake valve assembly 23. Specifically, assuming the stop plug 162 is disposed on the side of the first component 11 facing the pump body 2, either the locking mechanism 16 is placed close to the second brake valve assembly to maintain a compact structure, but if they are too close, they will interfere with each other; or the distance between them is appropriately increased to avoid interference, which would require extending the length of the infusion cartridge 1 and the pump body 2, thus increasing the size of the infusion pump. While a slightly larger size is acceptable for ordinary infusion pumps, for portable analgesic pumps, the size should be as compact as possible.

[0051] Specifically, when the infusion cartridge 1 is combined with the pump body 2, the pump body 2 can drive the locking mechanism 16 to switch from the closed state to the open state and remain in the open state. When the infusion cartridge 1 is separated from the pump body 2, the locking mechanism 16 can automatically switch from the open state to the closed state. That is, when the infusion cartridge 1 is combined with the pump body 2, the default state of the infusion cartridge 1 is the state of open flow channel 1a. At this time, the liquid in the infusion tube 3 is automatically transferred to the state controlled by the plunger assembly 21, the first brake valve assembly 22 and the second brake valve assembly 23 of the pump body 2, that is, the locking mechanism 16 is in the open state. When the infusion cartridge 1 is separated from the pump body 2, the default state of the infusion cartridge 1 is the state of closed flow channel 1a, that is, the locking mechanism 16 is in the closed state, preventing the liquid in the infusion cartridge 1 from flowing out by itself.

[0052] The material of the first elastic diaphragm 14 must meet the biocompatibility requirements specified in the relevant standards, and it must be a material with the expected elasticity and compression resistance, such as silicone. Similarly, the material of the second elastic diaphragm 15 must meet the biocompatibility requirements specified in the relevant standards, and it must be a material with the expected elasticity and compression resistance, such as silicone.

[0053] The material of the first elastic diaphragm 14 and the second elastic diaphragm 15 can be the same or different, and there is no restriction here.

[0054] In one embodiment, please refer to Figure 2 The locking mechanism 16 also includes an elastic element 17, which applies a force to the mounting bracket 161 to keep the locking mechanism 16 in the closed state of the closed flow channel 1a. That is, the default position of the locking mechanism 16 is the closed state when no external force is applied. When no external force is applied to the locking mechanism 16, the locking mechanism 16 is relatively stably closed under the action of the elastic element 17.

[0055] The specific structural type of the elastic element 17 is not limited, for example, it can be a tension spring, a compression spring, a torsion spring, or other elastic bodies. In the embodiments of this application, the elastic element 17 is a torsion spring.

[0056] In one embodiment, the opening state of the locking mechanism 16 includes a first open state, in which the locking mechanism 16 remains in the first open state under the action of an external force; when the external force disappears or the elastic force of the external force elastic member 17 can overcome the force of the external force on the locking mechanism 16, the elastic member 17 can drive the locking mechanism 16 to automatically switch from the first open state to the closed state.

[0057] Specifically, during the assembly of the pump body 2 and the infusion cartridge 1, the force exerted by the pump head frame 28 of the pump body 2 on the locking mechanism 16 is the aforementioned external force. When the force exerted by the pump head frame 28 of the pump body 2 on the locking mechanism 16 overcomes the force exerted by the elastic element 17 on the locking mechanism 16, the pump head frame 28 of the pump body 2 drives the locking mechanism 16 to switch from the closed state to the first open state and keeps the locking mechanism 16 in the open state. When the pump head frame 28 of the pump body 2 separates from the infusion cartridge 1, the force exerted by the pump head frame 28 of the pump body 2 on the locking mechanism 16 disappears, that is, the external force acting on the locking mechanism 16 disappears, and the elastic element 17 drives the locking mechanism 16 to automatically switch from the first open state to the closed state. In other words, an external force needs to act on the locking mechanism 16 to keep the locking mechanism 16 in the first open state.

[0058] In other words, when the infusion cartridge and pump body are engaged in this embodiment, the flow channel inside the infusion cartridge automatically opens without any other operation, greatly facilitating the user. When the infusion cartridge and pump body are separated, the locking mechanism 16 automatically closes the flow channel, preventing the liquid inside the infusion cartridge from flowing out and causing excessive infusion or harm to the environment from the medication.

[0059] In one embodiment, the open state further includes a second open state. See also... Figure 4 The locking mechanism 16 includes a bolt structure 1614 disposed on the mounting bracket 161. The bolt structure 1614 can lock into the rigid component 10 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, and the liquid can flow continuously in the flow channel 1a. For example, the second open state is often used to remove air from the infusion set before infusion.

[0060] When the pump body 2 is separated from the infusion tank 1, and it is necessary to keep the flow channel 1a in the open state, the locking structure 1614 can be locked with the rigid component 10. At this time, the locking mechanism 16 and the rigid component 10 do not move relative to each other, and the locking mechanism 16 is locked in the current second open state.

[0061] In one embodiment, please refer to Figure 2The rigid component 10 is provided with two through holes 1d extending through the rigid component 10 along its thickness direction. The flow channel 1a is located between the two through holes 1d. The mounting bracket 161 includes a crossbar 1612, a connecting rod 1611, and a sliding rod 1613. Each through hole 1d is provided with a sliding rod 1613. The connecting rod 1611 and the crossbar 1612 are located on opposite sides of the rigid component 10 along its thickness direction. 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 crossbar 1612. The stop plug 162 is provided on the crossbar 1612. When the pump head frame 28 of the pump body 2 is combined with the infusion tank 1, the pump head frame 28 of the pump body 2 pushes the connecting rod 1611 to move toward the third component 13. The connecting rod 1611 drives the entire locking mechanism 16 to move synchronously. During the movement, the stop plug 162 gradually disengages from the second elastic diaphragm 15.

[0062] It should be noted that the connecting rod 1611 and the crossbar 1612 are separate structures, meaning they are not integrally formed. This allows the sliding rod 1613 to pass through the through hole 1d. Specifically, the connecting rod 1611 and the two sliding rods 1613 can be integrally formed, for example, a one-piece injection molded part; or the crossbar 1612 and the two sliding rods 1613 can be integrally formed, for example, a one-piece injection molded part.

[0063] In this embodiment of the application, the connecting rod 1611 and the two sliding rods 1613 are integrally formed as an example for description.

[0064] For example, to facilitate the connection between the sliding rod 1613 and the crossbar 1612, in one embodiment, please refer to [the following text]. Figure 2 Both ends of the crossbar 1612 are provided with connecting holes 1612a, which can be blind holes or through holes, and are not limited here. The second end of the sliding rod 1613 is fixedly inserted into the connecting hole 1612a. For example, the sliding rod 1613 is inserted into the connecting hole 1612a and then bonded or ultrasonically welded to the inner wall of the connecting hole 1612a; or, the sliding rod 1613 and the connecting hole 1612a are interference-fitted, and the two are fixedly connected by friction.

[0065] To facilitate rapid positioning of the crossbar 1612 during assembly, in one embodiment, the circumferential surface of the second end of the sliding rod 1613 is provided with a stepped surface 1613a, and the crossbar 1612 abuts against the stepped surface 1613a. During assembly, simply align the connecting hole 1612a on the crossbar 1612 with the sliding rod 1613 and push it toward the sliding rod 1613 until the crossbar 1612 abuts against the stepped surface 1613a, and then bond it. The stepped surface 1613a enables rapid assembly of the crossbar 1612 and the sliding rod 1613, and ensures the relative position of the crossbar 1612 and the sliding rod 1613, improving the batch consistency of the product.

[0066] In one embodiment, the locking structure 1614 protrudes from the surface of the sliding rod 1613, and the locking structure 1614 is located on the side of one sliding rod 1613 opposite to the other sliding rod 1613. It is understood that the locking structure 1614 can be provided on one sliding rod 1613, or it can be provided on both sliding rods 1613. This application embodiment describes an example where both sliding rods 1613 are provided with the locking structure 1614.

[0067] The specific structure of the locking structure 1614 is not limited. For example, in the embodiments of this application, the locking structure 1614 is generally in the form of a sheet extending along the length direction of the sliding rod 1613.

[0068] Please see Figure 2 In one embodiment, a groove 1f is formed on the wall surface corresponding to the through hole 1d. The locking structure 1614 slides linearly with the groove 1f along the thickness direction of the infusion cartridge 1. That is, the locking structure 1614 can slide back and forth in the groove 1f along the thickness direction of the infusion cartridge 1. A stop portion 110 protruding toward the clearance hole is formed on the first member 11. When the sliding rod 1613 slides to a position where the locking structure 1614 does not interfere with the stop portion 110, the locking mechanism 16 can swing along the length direction of the infusion cartridge. The locking structure 1614 slides into the groove 1f and abuts against the side of the stop portion 110 facing the second member 12, thereby locking the locking mechanism 16 in the second open state.

[0069] It should be noted that when the locking mechanism 16 is in the first open state, it can be switched to the second open state or switched to the closed state.

[0070] In one embodiment, please refer to Figure 6A portion of the structure of the mounting bracket 161 protrudes from the side of the first component 11 facing the pump body 2; the pump head bracket 28 has a protruding post 281 for pushing the mounting bracket 161 on the side facing the infusion cartridge 1, and an inclined surface 281a is formed at the end of the protruding post 281 facing the infusion cartridge 1; during the assembly of the infusion cartridge 1 and the pump body 2, the inclined surface 281a pushes the mounting bracket 28 to move toward the third component 13 to fix the locking mechanism 16 in the first open state position.

[0071] The inclined surface 281a plays a positioning role for the mounting bracket 28. When the infusion box 1 and the pump body 2 are combined, the inclined surface 281a abuts against the mounting bracket 161 to prevent the mounting bracket 161 from moving along the thickness direction of the infusion box 1 or swinging along the length direction of the infusion box 1. In other words, the locking mechanism 16 is fixed in the current position and cannot be displaced, thus improving the working reliability of the locking mechanism 16.

[0072] In one embodiment, the flow channel 1a extends in a straight line in the projection perpendicular to the thickness direction of the infusion tank 1, which facilitates the structural arrangement of the pump body 2.

[0073] In this embodiment, the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 are driven by the same camshaft 24. This simplifies the drive structure, making the product compact and easy to carry, and also reduces costs.

[0074] It should be noted that the plunger assembly 21 can be a single column or a structure composed of multiple components. Similarly, the first brake valve column assembly 22 can be a single column or a structure composed of multiple components. The second brake valve column assembly 23 can be a single column or a structure composed of multiple components. This application does not impose any limitations on these aspects.

[0075] In one embodiment, please refer to the following: Figure 2 and Figure 7 The first groove 121 includes two pressure monitoring chambers 121d, one of which is located upstream of the first braking chamber 121b, and the other is located downstream of the second braking chamber 121c. The first component 11 has a fourth hole 11d corresponding to the pressure monitoring chamber 121d. The pump body 2 includes a pressure monitoring device 26, which abuts against the first elastic diaphragm 14 through the fourth hole 11d. The pressure monitoring device 26 monitors the pressure of the liquid in the flow channel 1a and can determine whether there is an abnormal pressure, blockage, or empty bottle based on the pressure value.

[0076] 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 there is no limitation herein.

[0077] The specific structural form of the power unit 25 is not limited. In this embodiment, the power unit 25 includes a motor 251 and a transmission mechanism 252. The transmission mechanism 252 connects 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 for transmission. In this embodiment, the transmission mechanism 252 is a gear set, which includes at least two gears. One gear is coaxially arranged with the camshaft 24, and the other gear is coaxially arranged with the rotating shaft. The two gears can directly mesh for transmission, or they can indirectly achieve transmission through other intermediate gears.

[0078] The transmission mechanism 252 can be a single-stage transmission or a multi-stage transmission, etc., and there is no limitation here.

[0079] In one embodiment, the motor 251 is a DC motor to reduce its size. In this embodiment, the camshaft 21 only needs to drive the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 to move sequentially. Therefore, the torque output of the small-sized DC motor is sufficient to meet the torque required by the camshaft 21. Thus, the infusion pump in this embodiment only requires one motor, making it small, portable, and suitable for use as a portable analgesic pump.

[0080] In one embodiment, the camshaft 21 is capable of both forward and reverse rotation. When the camshaft 21 rotates forward, it drives the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 to peristalse in a forward sequence to drive the liquid in the flow channel to flow forward, allowing the liquid to enter the patient's body. When the camshaft 21 rotates in reverse, it drives the plunger assembly 21, the first brake valve assembly 22, and the second brake valve assembly 23 to peristalse in a reverse sequence to drive the liquid in the flow channel to flow backward. When a blockage occurs during the liquid delivery process, the camshaft 21 can be precisely reversed, and the infusion pump will back-pump the liquid, releasing the blockage pressure and greatly reducing the risk of harm to the patient caused by the blockage pressure.

[0081] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An infusion cartridge for an infusion set, characterized in that, The infusion cartridge has a flow channel (1a), and the infusion cartridge includes: A rigid component (10) comprising a plurality of stacked components, at least one of which has a groove. An elastic diaphragm is disposed between two adjacent components to sealably cover the groove, the elastic diaphragm and the groove together forming at least a portion of the flow channel; A locking mechanism (16) includes a mounting bracket (161) and a stop plug (162) fixedly disposed on the mounting bracket (161). The stop plug (162) can squeeze the elastic diaphragm to close the flow channel (1a). The locking mechanism (16) closes or opens the flow channel (1a) through the stop plug (162). The mounting bracket (161) is movably connected to the rigid component so that the locking mechanism (16) can switch between a closed state of closing the flow channel (1a) and an open state of opening the flow channel (1a). The component includes a first component (11), a second component (12), and a third component (13). The groove includes a first groove (121) and a second groove (122). The elastic diaphragm includes a first elastic diaphragm (14) and a second elastic diaphragm (15). The second component (12) is disposed between the first component (11) and the third component. Between the components (13), the second component (12) is provided with the first groove (121) on the side facing the first component (11), and the first elastic diaphragm (14) is disposed between the first component (11) and the second component (12) to sealably cover the first groove (121); the second component (12) is provided with the second groove (122) on the side away from the first component (11); the second groove (122) communicates with the first groove (121) and is located downstream of the first groove (121); the second elastic diaphragm (15) is disposed between the second component (12) and the third component (13) to sealably cover the second groove (122); the stop plug (162) is disposed on the side of the third component (13) away from the second component (12), and the stop plug (162) squeezes the second elastic diaphragm (15) to close the flow channel (1a).

2. The infusion box according to claim 1, characterized in that, The infusion cartridge includes an elastic element (17) that applies a force to the mounting bracket (161) so that the locking mechanism (16) can remain in a closed state with the flow channel (1a) closed.

3. The infusion box according to claim 2, characterized in that, The open state includes a first open state, in which the locking mechanism (16) remains in the first open state under the action of external force; when the external force disappears or the elastic force of the elastic element (17) overcomes the force of the external force on the locking mechanism (16), the elastic element (17) drives the locking mechanism (16) to automatically switch from the first open state to the closed state.

4. The infusion box according to claim 3, characterized in that, The open state includes a second open state, and the locking mechanism (16) includes a bolt structure (1614) disposed on the mounting bracket (161); the bolt structure (1614) can selectively engage with the rigid component (10) to lock the locking mechanism (16) in the second open state.

5. The infusion box according to claim 4, characterized in that, The rigid component (10) is provided with two through holes (1d) that penetrate the rigid component (10) along the thickness direction. The flow channel (1a) is located between the two through holes (1d). The mounting bracket (161) includes a crossbar (1612), a connecting rod (1611), and a sliding rod (1613). Each through hole (1d) is provided with a sliding rod (1613). The connecting rod (1611) and the crossbar (1612) are located on opposite sides of the rigid component (10) along the thickness direction. 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 crossbar (1612). The stop plug (162) is located on the crossbar (1612).

6. The infusion box according to claim 5, characterized in that, The crossbar (1612) is provided with two connecting holes (1612a), and the second end of the sliding rod (1613) is fixedly inserted into the connecting hole (1612a).

7. The infusion box according to claim 6, characterized in that, The second end of the sliding rod (1613) has a stepped surface (1613a) on its circumferential surface, and the crossbar (1612) abuts against the stepped surface (1613a).

8. The infusion box according to claim 5, characterized in that, The components include a first component (11) and a second component (12). The locking structure (1614) protrudes from the surface of the sliding rod (1613), and a groove (1f) is formed on the wall surface corresponding to the through hole (1d). A stop (110) protruding toward the through hole (1d) is formed on the first component (11). When the sliding rod (1613) slides to a position where the locking structure (1614) does not interfere with the stop (110), the locking mechanism (16) can swing along the length direction of the infusion box. The locking structure (1614) slides into the groove (1f) and abuts against the side of the stop (110) facing the second component (12), so that the locking mechanism (16) is locked in the second open state.

9. The infusion box according to claim 1, characterized in that, In a projection perpendicular to the thickness direction of the infusion box, the flow channel (1a) extends in a straight line.

10. An infusion set, characterized in that, The infusion cartridge includes multiple segments of infusion tubing (3) and an infusion box as described in any one of claims 1-9, the infusion box having an inlet (1b) and an outlet (1c), wherein one segment of the infusion tubing (3) is connected to the inlet (1b), and another segment of the infusion tubing (3) is connected to the outlet (1c), and the infusion tubing (3) is in communication with the flow channel (1a).

11. An infusion pump, comprising a pump body (2) and an infusion set as claimed in claim 10, wherein when the infusion cartridge is combined with the pump body (2), the pump body (2) is capable of driving the locking mechanism (16) to switch from a closed state to an open state and remain in the open state; and when the infusion cartridge is separated from the pump body (2), the locking mechanism (16) is capable of automatically switching from an open state to a closed state.

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