Infusion pump

Abstract

The infusion pump has a pump body with a first metal mounting base, a pump door with a second metal mounting base, a pump body assembly mounted on the first metal mounting base, and a pressure tube assembly mounted on the second metal mounting base. The second metal mounting base can be locked and unlocked with the first metal mounting base. In the locked state, the second metal mounting base is fixedly connected with the first metal mounting base and locked. Since the metal parts have good strength and rigidity and are not easy to deform and crack under stress, the fixation of the first metal mounting base and the second metal mounting base is reliable. Meanwhile, the reaction force of the infusion tube on the pump body assembly and the pressure tube assembly is respectively transmitted to the first metal mounting base and the second metal mounting base, thereby forming a closed loop transmission of force, canceling out part of the force, reducing the stress damage of the metal mounting bases and parts, ensuring the fixation reliability of the pump body assembly, and ensuring the safety of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a structure of an infusion pump. BACKGROUND

[0002] An infusion pump is a kind of liquid infusion device widely used in medical treatment. A general infusion pump comprises a pump body and a pump door. The pump body generally has an infusion tube mounting structure and other necessary components. The flow of liquid in the infusion pump is driven by the extrusion force applied to the infusion tube by a peristaltic pump body and a pressure tube assembly used in conjunction with the peristaltic pump body. The peristaltic pump and the pressure tube assembly extrude the infusion tube from both sides of the infusion tube, i.e., the peristaltic pump and the pressure tube assembly will generate corresponding reaction forces on the infusion tube. Generally, the peristaltic pump is installed on a plastic base by a threaded member. When the peristaltic pump is working for a long time under the reaction force of the infusion tube, the force is equivalent to an alternating load. When the threaded member fixing the pump body assembly on the plastic base is subjected to the impact of the alternating load for a long time, the plastic base is prone to cracking. In turn, the peristaltic pump body will be displaced. When the pump door and the pump body are locked, the distance between the peristaltic pump body and the pressure tube assembly increases. When the distance between the peristaltic pump body and the pressure tube assembly increases to the extent that the infusion tube cannot be blocked, the liquid in the infusion tube will flow freely, which will cause great harm to the patient. SUMMARY

[0003] The present application provides an infusion pump.

[0004] In an embodiment of the present application, an infusion pump is provided, comprising:

[0005] a pump body having an infusion tube mounting structure, a first metal mounting seat, and a pump body assembly, the infusion tube mounting structure being used for mounting an infusion tube, the pump body assembly being arranged opposite to the infusion tube mounting structure and being installed on the first metal mounting seat to extrude the infusion tube;

[0006] and a pump door having a second metal mounting seat and a pressure tube assembly, the pressure tube assembly being installed on the second metal mounting seat, the pressure tube assembly being used for abutting against the infusion tube from a side of the infusion tube away from the pump body assembly;

[0007] the second metal mounting seat moves relative to the first metal mounting seat, and has a locking position and an unlocking position on the movement track of the second metal mounting seat;

[0008] at the locking position, the second metal mounting seat is fixedly connected and locked with the first metal mounting seat, and the pressure tube assembly and the pump body assembly are located on both sides of the infusion tube, so that the pump body assembly extrudes the infusion tube when starting to perform infusion; at the unlocking position, the second metal mounting seat is unlocked with the first metal mounting seat, so that the pressure tube assembly can move away from one side of the infusion tube to release the infusion tube.

[0009] In one embodiment, the first metal mount is hinged to the second metal mount, so that the second metal mount rotates relative to the first metal mount; the first metal mount has a first locking structure, and the second metal mount has a second locking structure, when the second metal mount is rotated to a locking position, the first locking structure and the second locking structure are fixedly connected.

[0010] In one embodiment, the first metal mount includes an upper metal piece and a lower metal piece, the pump assembly is fixedly installed on the lower metal piece or the upper metal piece, the first locking structure is installed on the upper metal piece, and the upper metal piece is fixedly installed on the lower metal piece, and the second metal mount is hinged to the lower metal piece.

[0011] In one embodiment, the lower metal piece is substantially in a U-shaped structure, and the upper metal piece is substantially in an inverted U-shaped structure, the upper metal piece is butted to the lower metal piece and fixedly connected by a metal piece.

[0012] In one embodiment, the pump body further includes a pump body shell, the first metal mount and the pump body shell have a bottom cover, a top cover, a front cover and a rear cover, the bottom cover, the top cover, the front cover and the rear cover enclose an installation cavity, the first metal mount and the pump body assembly are installed in the installation cavity, the infusion tube mounting structure is arranged on the front cover, the front cover has a pump mounting opening, and one end of the pump assembly is located at the pump mounting opening, so that the pump body assembly extrudes the infusion tube.

[0013] In one embodiment, the pump body further includes a pump body shell, the first metal mount and the pump body shell enclose an installation cavity, the first locking structure and the pump body assembly are installed in the installation cavity, and the first metal mount serves as at least one of a front cover, a bottom cover, a top cover and a rear cover of the pump body.

[0014] In one embodiment, the first metal mount is a box body structure, and the first locking structure and the pump body assembly are installed inside the box body structure.

[0015] In one embodiment, the first locking structure includes a lock rod assembly and a driving mechanism, the lock rod assembly has a buckling part for cooperating with a corresponding second locking structure, the lock rod assembly is movably installed on the first metal mount, the driving mechanism drives the lock rod assembly to move, and the lock rod assembly realizes locking and unlocking with the second locking structure on the second metal mount during movement.

[0016] In one embodiment, the driving mechanism has a driving member and an output member in transmission connection with the driving member, the lock rod assembly is rotatably mounted on the output member, the output member drives the lock rod assembly to move along a first axis in a horizontal plane to lock or unlock the lock rod assembly with the second locking structure; the first axis passes through the axis of the output member; the rotation center line of the lock rod assembly relative to the output member is in the same horizontal plane as the first axis and perpendicular to the first axis.

[0017] In one embodiment, the output member and the lock rod assembly are in line contact and / or point contact, the contact positions of the line contact and / or the contact positions of the point contact are symmetrically distributed on both sides of the first axis and in the same horizontal plane as the first axis, and the line connecting the contact positions of the output member and the lock rod assembly is perpendicular to the first axis.

[0018] In one embodiment, the driving mechanism includes a screw nut transmission mechanism, the driving member is a motor, the nut in the screw nut transmission mechanism serves as the output member, the lock rod assembly is mounted on the nut, the motor drives the screw in the screw nut transmission mechanism to drive the nut and the lock rod assembly to move, and the first axis coincides with the central axis of the screw in the screw nut transmission mechanism.

[0019] In one embodiment, at least one of the nut and the lock rod assembly has a protrusion, and the other has a corresponding socket, the socket is sleeved on the outer wall of the protrusion, and the inner wall of the socket is in line contact with the outer wall of the protrusion.

[0020] In one embodiment, at least one of the inner wall of the socket and the outer wall of the protrusion has an arc-shaped wall.

[0021] In one embodiment, the socket has a U-shaped opening, and the U-shaped socket is sleeved on the protrusion.

[0022] In one embodiment, the nut has protrusions on both sides, and the lock rod assembly has sockets corresponding to the protrusions.

[0023] In one embodiment, the fastening part has a buckle, the buckle has a fastening surface to contact and fasten the corresponding second locking structure, the fastening surface has a first inclined surface and a second inclined surface, the first inclined surface is arranged at the outer end of the fastening surface, the second inclined surface is connected to the inward end of the first inclined surface, and the inclination angle of the first inclined surface is greater than that of the second inclined surface.

[0024] In one embodiment, the lock rod assembly comprises a lock rod and a connecting piece, the lock rod has the fastening part, the lock rod is connected with the connecting piece, and the connecting piece is rotatably connected with the output piece, so that the output piece drives the connecting piece and the lock rod to move.

[0025] In one embodiment, the lock rod is a long strip-shaped plate structure, and the fastening part is at least two, which are arranged on the side of the lock rod facing the corresponding lock.

[0026] In one embodiment, the first metal mounting base has a protruding guide part, the lock rod assembly has a corresponding guide port, the guide port is sleeved on the guide part, and the area in the guide port in contact with the guide part is provided with a wear-resistant piece.

[0027] In one embodiment, the pump door further comprises a door body, the second metal mounting base is installed in the door body, and the second metal mounting base serves as at least one of a front cover, a bottom cover, a top cover and a rear cover of the pump door.

[0028] In one embodiment, the second metal mounting base is a box body structure.

[0029] In one embodiment, the second locking structure has a lock catch for fastening and locking with the first locking structure.

[0030] In one embodiment, the pump assembly comprises a pump mounting base, a peristaltic pump and an elastic piece, the pump mounting base is fixedly installed on the first metal mounting base, the peristaltic pump is installed on the pump mounting base, and the elastic piece acts between the peristaltic pump and the first metal mounting base to provide an elastic restoring force for driving the peristaltic pump to move towards the pressure pipe assembly.

[0031] The infusion pump according to the above embodiment, the pump body has a first metal mounting seat, the pump door has a second metal mounting seat, the pump body assembly is installed on the first metal mounting seat, and the pressure tube assembly is installed on the second metal mounting seat, and the pressure tube assembly is used for abutting against the infusion tube from the side of the infusion tube away from the pump body assembly. Meanwhile, the second metal mounting seat and the first metal mounting seat can be locked and unlocked. In the locked state, the second metal mounting seat is fixedly connected with the first metal mounting seat and is locked. Since the strength and rigidity of the metal parts are relatively good, they are not easy to deform and crack under stress, and the fixation of the pump body assembly and the pressure tube assembly to the corresponding first metal mounting seat and second metal mounting seat can still be reliable when the pump body assembly and the pressure tube assembly are subjected to the reaction force of the infusion tube. Meanwhile, the reaction force of the infusion tube on the pump body assembly and the pressure tube assembly will be transmitted to the first metal mounting seat and the second metal mounting seat respectively, and at this time, the first metal mounting seat and the second metal mounting seat are connected with each other, and the high strength and rigidity of the metal material are matched, thereby forming a closed loop transmission of force, so that part of the force is offset, the stress damage of the metal mounting seat and the parts is reduced, the fixation reliability of the pump body assembly is ensured, and the safety of the product is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 and 2 It is a structural schematic diagram of the infusion pump (pump door opening state) in an embodiment of the application.

[0033] Figure 3 and 4 It is a schematic diagram of the internal structure layout of the pump body in an embodiment of the application.

[0034] Figure 5 It is a schematic diagram of the cooperation structure of the first metal mounting seat and the second metal mounting seat (unlocked state) in an embodiment of the application.

[0035] Figure 6 It is a schematic diagram of the cooperation structure of the first metal mounting seat and the second metal mounting seat (locked state) in an embodiment of the application.

[0036] Figure 7 It is a schematic diagram of the pump body assembly installation in an embodiment of the application.

[0037] Figure 8 It is a schematic diagram of the cooperation structure of the lock rod assembly and the lock catch assembly in the locked state in an embodiment of the application.

[0038] Figure 9 It is a schematic diagram of the pump body assembly installation structure in an embodiment of the application.

[0039] Figure 10 It is a schematic diagram of the pump body assembly in an embodiment of the application.

[0040] Figure 11 Figure 9 is a schematic view of the assembly of the locking rod assembly and the locking rod driving mechanism in one embodiment of the present application;

[0041] Figure 12 Figure 10 is a schematic view of the assembly of the locking rod assembly and the screw nut transmission mechanism in one embodiment of the present application;

[0042] Figure 13 Figure 11 is a partial sectional view of the screw rod in the screw nut transmission mechanism in one embodiment of the present application;

[0043] Figure 14 Figure 12 is a schematic view of the structure of the locking rod buckle surface in one embodiment of the present application. DETAILED DESCRIPTION

[0044] The application will be further described in details through specific embodiments in combination with the drawings. In different embodiments, similar elements are marked with similar element numbers. In the following embodiments, many details are described in order to make the application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials or methods. In some cases, some operations related to the application are not shown or described in the specification in order to avoid the core part of the application being overwhelmed by too much description, and it is not necessary to describe these related operations in details for those skilled in the art according to the description in the specification and the general technical knowledge in the art.

[0045] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate way to form various embodiments. Meanwhile, the steps or actions in the method description can also be adjusted or changed in sequence as those skilled in the art can easily see. Therefore, the sequence in the specification and the drawings is only for the purpose of clearly describing one embodiment, and does not mean that it is the necessary sequence, unless otherwise stated that a certain sequence must be followed.

[0046] In this document, the serial numbers of components, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. Unless otherwise specified, "connection" and "coupling" in the present application include direct and indirect connection (coupling).

[0047] The present embodiment provides an infusion pump. The infusion pump is used to control the infusion drop number or infusion flow rate and other parameters, to ensure that the medicine can be installed and set at a speed, and the amount of medicine is accurate and safe to enter the patient's body.

[0048] Please refer to Figures 1 to 4The infusion pump comprises a pump body 100 and a pump door 200. The pump door 200 is lockably and openably mounted on the pump body 100. In the lockable and openable manner, generally, the pump door 200 is rotatably mounted on the pump body 100, so that the pump door 200 can be rotated to open and close the pump door 200. When infusion is needed, the pump door 200 is moved to the corresponding locking position and locked with the pump body 100 to perform infusion. Of course, in some embodiments, the lockable and openable manner is not limited to that the pump door 200 is rotatably connected to the pump body 100, and the pump door 200 can be lockably and openably connected to the pump body 100 in other manners, such as sliding, flipping, folding, etc. In addition, in other embodiments, the lockable and openable manner can also be that the pump door 200 is detachably connected to the pump body 100, that is, in the open state, the pump door 200 can be completely detached from the pump body 100, and when locking is needed, the pump door 200 is mounted on the pump body 100 again.

[0049] Please continue to refer to Figures 1 to 6 The pump body 100 comprises a pump body shell 110, a control module (not labeled in the figure), an external interface assembly 120, a power module 130, a battery assembly 140, a lock rod assembly 150 (combined Figure 11 ), a lock rod driving mechanism 160, and a pump body assembly 170.

[0050] The pump body shell 110 has a mounting cavity for mounting various components. The side of the pump body shell 110 facing the pump door 200 is a front cover 111, which has an infusion tube mounting structure for mounting an infusion tube and a pump body mounting position for mounting the pump body assembly 170. The infusion tube mounting structure is used to stabilize the infusion tube on the pump body 100 for infusion and various detections. As shown in Figure 1 , the infusion tube 300 is placed on the infusion tube mounting structure of the front cover 111, and generally, the infusion tube mounting structure can be a clamping structure or other mounting structure, which is not described here. The pump body mounting position is generally an installation window 1111 (as shown in Figure 7 ), and the part of the pump body 100 used to squeeze the infusion tube 300 can be extended from the installation window 1111 to squeeze the infusion tube 300.

[0051] The control module is the whole control center of the infusion pump, which generally has a processor and related control circuit, etc. The control module is connected with other modules, assemblies or mechanisms that need to be controlled to control these modules, assemblies or mechanisms according to the system settings. The external interface assembly 120 is mainly used for signal communication with external devices and power supply for the infusion pump. The external interface assembly 120 can select different interfaces as needed, for example, in some embodiments, please refer to Figure 2The external interface assembly 120 can include a power interface 121, a USB interface 122, a multi-functional interface 123, etc. In addition, in order to save space and make the infusion pump more compact, in one embodiment, the external interface assembly 120 is further provided with a speaker 124 for playing sound signals, without the need to additionally provide a speaker at other locations of the infusion pump.

[0052] The power module 130 is connected to the control module for powering the system and other electrical components. The battery assembly 140 serves as a power storage, which is usually used to power the system when the infusion pump is powered off. Of course, the battery assembly 140 can also be used to power the system when the infusion pump is not powered off. The lock rod assembly 150 is used to lock the pump door 200 when the infusion pump is in operation. The lock rod driving mechanism 160 is used to drive the lock rod assembly 150 to move, so as to switch the lock rod assembly 150 between the locked position and the unlocked position. The pump body assembly 170 is used to apply a squeezing force to the infusion tube 300, so as to drive the liquid in the infusion tube 300 to flow forward. The pump body assembly 170 can adopt various structures capable of squeezing the infusion tube, such as a peristaltic pump.

[0053] The control module, the external interface assembly 120, the power module 130, the battery assembly 140, the lock rod assembly 150, the lock rod driving mechanism 160, and the pump body assembly 170 are all arranged in the mounting cavity.

[0054] Please refer to Figures 5 to 8 In one embodiment, the pump body 100 further includes a first metal mounting seat 112. The first metal mounting seat 112 is mounted in the pump body shell 110. At least the pump body assembly 170, the lock rod assembly 150, and the lock rod driving mechanism 160 are mounted on the first metal mounting seat 112. The pump door 200 includes a second metal mounting seat 211, which is arranged in the door body 210. At least the tube pressing assembly 230 and the lock catch assembly 220 are mounted on the second metal mounting seat 211. In this embodiment, the pump body shell 110 and the door body 210 are not limited to metal materials, and can still be made of plastic.

[0055] The control module, the external interface assembly 120, the power module 130, the battery assembly 140, the lock rod assembly 150, the lock rod driving mechanism 160, and the pump body assembly 170 are all directly or indirectly mounted on the first metal mounting seat 112. Based on this, in some embodiments, the pump body shell 110 can even be omitted. When both the pump body shell 110 and the first metal mounting seat 112 are present, the pump body shell 110 is usually located on the outside of the pump body 100, and wraps the first metal mounting seat 112 and other components. Based on the same principle, in some embodiments, the door body 210 can also be omitted, and the second metal mounting seat 211 can be used as the door body.

[0056] In another embodiment, the first metal mount 112 is at least partially made of metal material. The first metal mount 112 is a part of the pump body 100, or the first metal mount 112 is the pump body 100. The pump body assembly 170, the lock rod assembly 150, and the lock rod driving mechanism 160 are mounted on the first metal mount 112. For example, the first metal mount 112 is at least one of the front cover, the bottom cover, the top cover, and the back cover of the pump body 100. In another embodiment, the first metal mount 112 is a box structure, and the control module, the external interface assembly 120, the power module 130, the battery assembly 140, the lock rod assembly 150, the lock rod driving mechanism 160, and the pump body assembly 170 are mounted in the box structure. In this case, the first metal mount 112 is the pump body 100.

[0057] Similarly, the second metal mount 211 is at least partially made of metal material. The second metal mount 211 is a part of the pump door 200, or the second metal mount 211 is the pump door 200. The tube pressing assembly 230 and the lock catch assembly 220 are mounted on the second metal mount 211. For example, the second metal mount 211 is at least one of the front cover, the bottom cover, the top cover, and the back cover of the pump door 200. In another embodiment, the second metal mount 211 is a box structure, and the related components of the pump door 200 are mounted in the box structure.

[0058] Further, one end of the first metal mount 112 is rotatably connected to the second metal mount 211, so that the pump door 200 is rotatable relative to the pump body 100. The second metal mount 211 has a locking position and an unlocking position. In the locking position, the lock rod assembly 150 is locked with the lock catch assembly 220, and the tube pressing assembly 230 is located on both sides of the infusion tube 300. When the pump body assembly 170 is activated, the pump body assembly 170 presses the infusion tube 300 to perform infusion. In the unlocking position, the lock rod assembly 150 is unlocked with the lock catch assembly 220, so that the tube pressing assembly 230 can be moved away from one side of the infusion tube 300 to release the infusion.

[0059] Of course, the first metal mounting seat 112 and the second metal mounting seat 211 are locked and unlocked by the lock rod assembly 150 and the lock catch assembly 220 in this embodiment. In fact, the first metal mounting seat 112 and the second metal mounting seat 211 can be locked and unlocked by various structures, such as magnetic attraction, adhesion, and other forms of clamping. The structure of the first metal mounting seat 112 for locking and unlocking with the second metal mounting seat 211 is referred to as the first locking structure in this application, which includes but is not limited to the lock rod assembly 150 shown in this embodiment, and can also be the magnetic attraction, adhesion, and other forms of clamping structure described above. Correspondingly, the structure of the second metal mounting seat 211 cooperating with the first locking structure is referred to as the second locking structure, which includes but is not limited to the lock catch assembly 220 shown in this embodiment, and can also be the magnetic attraction, adhesion, and other forms of clamping structure described above.

[0060] Since the metal parts have good strength and rigidity, they are not easy to deform and crack under stress, and can ensure that the pump body assembly 170 and the pressure pipe assembly 230 are still reliably fixed to the corresponding first metal mounting seat 112 and second metal mounting seat 211 when subjected to the reaction force of the infusion tube 300. At the same time, the reaction force of the infusion tube 300 on the pump body assembly 170 and the pressure pipe assembly 230 will be transmitted to the first metal mounting seat 112 and the second metal mounting seat 211, respectively, and at this time the first metal mounting seat 112 and the second metal mounting seat 211 are connected to each other. With the high strength and rigidity of the metal material, a closed-loop force transmission is formed, part of the force is cancelled, the stress damage of the metal supports and parts is reduced, the reliability of the pump body assembly 170 is ensured, and the safety of the product is ensured.

[0061] Further, please refer to Figure 5 In an embodiment, the lock rod assembly 150 is movably mounted on the pump body shell 110 or the first metal mounting seat 112. The pump body shell 110 or the first metal mounting seat 112 has a protruding guide limiting portion 1125, and the lock rod assembly 150 has a corresponding guide port 1512, which is sleeved on the guide limiting portion 1125, and the area inside the guide port 1512 in contact with the guide limiting portion 1125 is provided with a wear-resistant piece 1126.

[0062] Further, the first metal mounting seat 112 and the second metal mounting seat 211 can be integrally formed or fixedly connected by multiple metal components. The first metal mounting seat 112 and the second metal mounting seat 211 can be sheet metal parts, die cast parts, machined parts, and profiled parts.

[0063] Please refer to Figures 5 to 8In one embodiment, the first metal mounting base 112 includes an upper metal part 1121 and a lower metal part 1122. The pump body assembly 170 is fixedly mounted on the lower metal part 1122 or the upper metal part 1121. The locking rod assembly 150 is movably mounted on the upper metal part 1121. The upper metal part 1121 is fixedly mounted on the lower metal part 1122. The second metal mounting base 211 is hinged to the lower metal part 1122.

[0064] Of course, in other embodiments, the first metal mounting base 112 may also be formed by assembling left and right metal parts.

[0065] Please refer to Figures 5 to 8 As an example of an upper and lower assembly, the lower metal part 1122 is roughly U-shaped, and the upper metal part 1121 is roughly inverted U-shaped. The upper metal part 1121 and the lower metal part 1122 are connected by metal parts (such as screws 1124).

[0066] Please refer to Figures 5 to 8 In one embodiment, a front cover metal piece 1123 is further included, which is fixedly connected to the first metal piece and the second metal piece for mounting relevant components on the front cover 111. The front cover metal piece 1123 can be used as the front cover 111 of the pump body 100, or it can be made of a different material from the front cover 111 and then the two are assembled together, for example, the front cover 111 is made of plastic.

[0067] Please refer to Figure 9 and 10 In one embodiment, a peristaltic pump is used as an example. The pump body assembly 170 includes a pump mounting base 171, a peristaltic pump 172, and an elastic element 173. The pump mounting base 171 is fixedly mounted on a first metal mounting base 112, for example, it can be mounted on a lower metal part 1122. The peristaltic pump 172 is mounted on the pump mounting base 171, for example, it can be mounted on the sliding shaft 176 of the pump mounting base 171. The elastic element 173 acts between the peristaltic pump 172 and the first metal mounting base 112, providing an elastic restoring force to the peristaltic pump 172 to drive the peristaltic pump 172 to move in the direction of the pressure tube assembly 220.

[0068] exist Figure 9 and 10 In this case, the pump mounting base 171 is fixedly mounted on the lower metal part 1122 by a metal part (such as screw 175). Of course, it may also be mounted on the upper metal part 1121 or other places of the first metal mounting base 112.

[0069] Further, the battery assembly 140, the pump body assembly 170 and the lock rod driving mechanism 160 are arranged side by side at the back of the front cover 111. The pump body assembly 170 is arranged at the pump body mounting position to press the infusion tube 300. The battery assembly 140 and the lock rod driving mechanism 160 are arranged at the two sides of the pump body assembly 170 respectively. The lock rod assembly 150 is arranged above the pump body assembly 170 and the lock rod driving mechanism 160 (as shown in Figure 5 and 6 , the lock rod driving mechanism 160 drives the lock rod assembly 150 to move to lock and unlock the lock rod assembly 150 with the pump door 200. The power module 130 is arranged side by side with the external interface assembly 120, one of which is arranged at the back of the pump body assembly 170 and the other of which is arranged at the back of the lock rod driving mechanism 160. In Figure 3 and 4 , the external interface assembly 120 is arranged at the back of the lock rod driving mechanism 160 and the power module 130 is arranged at the back of the pump body assembly 170. In other embodiments, the positions of the two can be interchanged.

[0070] Correspondingly, please refer to Figure 1 and 2 , the pump door 200 has a door body 210, a lock catch assembly 220 and a tube pressing assembly 230. The lock catch assembly 220 and the tube pressing assembly 230 are mounted on the door body 210. The door body 210 can be rotatably connected with the pump body shell 110 or connected in other ways. The lock catch assembly 220 is used to lock with the lock rod assembly 150 and the tube pressing assembly 230 is arranged corresponding to the position of the pump body assembly 170 to press the infusion tube 300 together with the pump body assembly 170. The tube pressing assembly 230 can be a tube pressing block or other structural infusion tube pressing device.

[0071] In the above embodiments, the overall layout is arranged according to the volume and shape of each component, which can make full use of the advantages and disadvantages of the volume and shape of each component, so that the overall structure is more compact and the overall volume is smaller.

[0072] Further, please refer to Figure 1 and 4 , in an embodiment, the pump body 100 further comprises a liquid stopping assembly 181. For the convenience of description, this application divides the front cover 111 into an upstream area and a downstream area according to the liquid flow direction of the infusion tube 300, that is, the part of the infusion tube 300 where the liquid flows to the position of the pump body assembly 170 is the upstream 301 and the part of the infusion tube 300 where the liquid flows away from the position of the pump body assembly 170 is the downstream 302. The area of the front cover 111 corresponding to the upstream 301 of the infusion tube 300 is the upstream area and the area of the front cover 111 corresponding to the downstream 302 of the infusion tube 300 is the downstream area. In Figure 1In the shown angle, the liquid in the infusion tube 300 flows from right to left, the part of the front cover 111 on the right side of the pump body assembly 170 is the upstream area, and the part on the left side of the pump body assembly 170 is the downstream area. The liquid stopping assembly 181 is located in the downstream area of the front cover 111 and exposed from the front cover 111 to stop the liquid flow in the infusion tube 300. In terms of the liquid flow in the infusion tube 300, the liquid stopping assembly 181 is arranged downstream of the pump body assembly 170, which is beneficial to cut off more liquid flow. When infusion is not needed, the liquid flow in the tube can be quickly stopped, and too much liquid can not flow into the patient. In particular, the liquid stopping assembly 181 is arranged as far as possible on the outside of the downstream area, which can reduce the liquid flow to the patient as much as possible when infusion is not needed, and ensure the safety of the product.

[0073] Please refer to Figure 4 In an embodiment, the liquid stopping assembly 181 is arranged in the gap between the lock rod driving mechanism 160 and the front cover 111. The liquid stopping assembly 181 is located in front of or directly in front of the lock rod driving mechanism 160 (the side where the front cover 111 is located is the front, and the side opposite to the front cover 111 is the rear, the same below), which can make full use of the space between the lock rod driving mechanism 160 and the front cover 111.

[0074] In the above embodiment, the liquid stopping assembly 181 can be a liquid stopping clamp or other forms of liquid stopping structure. In addition, in some embodiments, the infusion pump can also not be provided with the liquid stopping assembly 181, and manual liquid stopping structure can be added to the part of the infusion tube 300 outside the infusion pump to stop the liquid flow in the infusion tube 300.

[0075] Further, in order to improve the safety of the infusion pump and monitor the infusion state, please refer to Figures 1 to 4 In an embodiment, the pump body 100 further comprises an upper pressure detection assembly 182 and a lower pressure detection assembly 183. The upper pressure detection assembly 182 is located in the upstream area of the front cover 111. The lower pressure detection assembly 183 is located in the downstream area of the front cover 111 and upstream of the liquid stopping assembly 181. The upper pressure detection assembly 182 and the lower pressure detection assembly 183 are exposed from the front cover 111 to detect the liquid pressure in the infusion tube 300. The door body 210 is provided with an upper pressure detection block 241 corresponding to the upper pressure detection assembly 182 and a lower pressure detection block 242 corresponding to the lower pressure detection assembly 183.

[0076] The upper pressure detection component 182 and the lower pressure detection component 183 can use pressure sensors and other components to detect the pressure in the infusion tube 300. The upper pressure detection component 182 mainly detects the pressure data of the infusion tube 300 before being pressurized by the pump body component 170, and the lower pressure detection component 183 mainly detects the pressure data of the infusion tube 300 after being pressurized by the pump body component 170. These data are combined and analyzed to obtain accurate pressure data, so as to better adjust the infusion parameters of the infusion pump and improve the safety of patients during use.

[0077] Please refer to Figure 3 and 4 In an embodiment, the upper pressure detection component 182 is installed in the gap between the battery component 140 and the front cover 111. In an embodiment, the lower pressure detection component 183 is installed in the gap between the lock rod driving mechanism 160 and the front cover 111. This further improves the compactness of the entire machine.

[0078] Further, in order to improve the safety of the infusion pump and monitor the infusion state, please refer to Figures 1 to 4 In an embodiment, the pump body 100 further comprises an upper ultrasonic detection component 184 and a lower ultrasonic detection component 185. The upper ultrasonic detection component 184 is located in the upstream area of the front cover 111 and downstream of the upper pressure detection component 182. The lower ultrasonic detection component 185 is located in the downstream area of the front cover 111 and upstream of the lower pressure detection component 183. The upper ultrasonic detection component 184 and the lower ultrasonic detection component 185 are exposed from the front cover 111 to detect the bubbles in the infusion tube 300. The door body 210 is provided with an upper ultrasonic detection pressing block 251 corresponding to the upper ultrasonic detection component 184 and a lower ultrasonic detection pressing block 252 corresponding to the lower ultrasonic detection component 185.

[0079] This dual detection method of pressure and ultrasonic waves can detect the pressure in the tube and the bubbles in the tube, which can improve the accuracy of bubble and pressure detection and make the product safer.

[0080] In the above embodiment, the upper ultrasonic detection component 184 and the lower ultrasonic detection component 185 are respectively located outside the upper pressure detection component 182 and the lower pressure detection component 183. In fact, the positions of the ultrasonic detection component and the pressure detection component can be interchanged. For example, in an embodiment, the upper ultrasonic detection component 184 is located in the upstream area of the front cover 111 and upstream of the upper pressure detection component 182. The lower ultrasonic detection component 185 is located in the downstream area of the front cover 111 and between the lower pressure detection component 183 and the liquid stopping component 181.

[0081] Please refer to Figure 3 and 4In one embodiment, the upper ultrasonic detection component 184 is installed in the gap between the battery assembly 140 and the front cover 111. In another embodiment, the lower ultrasonic detection component 185 is installed in the gap between the locking lever drive mechanism 160 and the front cover 111.

[0082] Further, please refer to Figures 1 to 4 In one embodiment, the pump body 100 further includes an upper tube in-situ detection assembly 186 and a lower tube in-situ detection assembly 187. The upper tube in-situ detection assembly 186 is located upstream of the front cover 111 and upstream of the upper pressure detection assembly 182 and the upper ultrasonic detection assembly 184. The lower tube in-situ detection assembly 187 is located downstream of the front cover 111 and downstream of the liquid-stopping assembly 181. The upper tube in-situ detection assembly 186 and the lower tube in-situ detection assembly 187 protrude from the front cover 111 to detect whether the infusion tubing 300 is installed in place.

[0083] Please refer to Figure 3 and 4 In one embodiment, the upper tube presence detection component 186 is installed in the gap between the battery assembly 140 and the front cover 111. In another embodiment, the lower tube presence detection component 187 is installed on the rear side of the front cover 111 and located outside the locking lever drive mechanism 160.

[0084] The upper tube in-place detection component 186 and the lower tube in-place detection component 187 can detect and indicate whether the infusion tubing 300 is installed in the correct position. The two outermost positions of the infusion tubing 300 are the most difficult to install correctly; therefore, if... Figure 1 As shown, in one embodiment, the upper tube in-situ detection component 186 and the lower tube in-situ detection component 187 are respectively disposed at the outermost ends of both sides of the front cover 111, so as to effectively realize tube in-situ monitoring and improve product safety.

[0085] Further, please refer to Figures 1 to 4 In one embodiment, the pump body 100 further includes a drop count sensor 188, which is disposed behind the upper pipe presence detection assembly 186. This sensor can be used to detect the state of liquid dripping and to count the droplets.

[0086] Further, please refer to Figure 3 and 4 In one embodiment, the pump body 100 further includes a wireless signal module 189, such as a WIFI module or a Bluetooth module, which is located outside the locking lever drive mechanism 160 and in front of the external interface component 120 (which can also be replaced by a power module 130), making full use of this part of the space.

[0087] Further, the lock rod assembly 150 is movably mounted on the first metal mounting base 112, for example, on the upper metal piece 1121. During the movement of the lock rod assembly 150, it realizes the locking and unlocking with the lock catch mechanism on the pump door 200, so as to realize the locking and unlocking of the pump door 200 and the pump body 100.

[0088] In general infusion pumps, the lock rod driving mechanism adopts a motor, the motor drives a lead screw, the lead screw drives a matched nut, the nut is connected with a lock rod of the lock rod assembly, and the lock rod translates together with the nut to realize the locking and unlocking with the lock catch on the pump door, so as to realize the opening and closing of the pump door of the infusion pump. Since the force of the lock rod to open and close the door is large and the load of the lock rod is large, the conventional method is to rigidly fix the nut on the lock rod. When the movement direction of the lock rod cannot keep parallel with the lead screw, the nut and the lead screw cooperate to generate a torque, which causes the motor to output a larger torque to drive the lock rod to move. In the actual movement process of the lock rod, it is difficult to ensure that the lock rod is parallel with the lead screw, and this rigid connection mode will generate a torque on the nut and the lead screw. If the motor torque margin is not enough, the lock rod will be stuck, and the opening and closing of the door will not be smooth. If the motor torque margin is too large, the system power consumption will be increased, and the motor size will be increased, which is not conducive to the miniaturization of the equipment.

[0089] To this end, in one embodiment, the lock rod driving mechanism 160 has a driving member and an output member in transmission connection with the driving member. The lock rod assembly 150 is rotatably mounted on the output member, and the output member drives the lock rod assembly 150 to make reciprocating linear motion along a first axis in a horizontal plane, so as to make the lock rod assembly 150 lock with the lock catch or unlock with the lock catch. The first axis passes through the axis of the output member, for example Figure 11 and 12 As shown in one embodiment, the output member is a nut 163 of a lead screw and nut transmission mechanism, and the first axis passes through the axis of the nut 163, that is, coincides with the central axis of the lead screw 162 matched with the nut 163. Of course, the output member can also be other components, for example, a piston rod in a pneumatic cylinder or a hydraulic cylinder, at this time, the first axis coincides with the central axis of the piston rod. The rotation center line of the lock rod assembly 150 relative to the output member is in the same horizontal plane as the first axis, and is perpendicular to the first axis.

[0090] The lock rod assembly 150 is rotatably mounted on the output member, and the rotation center line of the lock rod assembly 150 relative to the output member is in the same horizontal plane as the first axis and perpendicular to the first axis. When the lock rod assembly 150 is tilted by an external force, the lock rod assembly 150 can rotate relative to the output member to automatically adjust the shaft center fitting structure with the output member through the rotational connection, without causing the output member to deflect around the rotation center line, and the reaction force of the lock rod assembly 150 to the output member will not generate a moment deviating from the center of the output member, thereby avoiding the deflection of the output member and the eccentric moment caused by the output member to the components driving the output member (such as the lead screw 162 or the piston cylinder in other embodiments).

[0091] Further, the contact between the output member and the lock rod assembly 150 is linear contact and / or point contact, and the contact positions of the linear contact and / or the contact positions of the point contact are symmetrically distributed on both sides of the first axis and in the same horizontal plane as the first axis. The line connecting the contact positions between the output member and the lock rod assembly 150 is perpendicular to the first axis.

[0092] The driving mechanism can be selected but is not limited to a motor transmission structure, for example, as shown above, it can also use a gas cylinder, a liquid cylinder, or even an electromagnet and other structures that can output reciprocating linear motion.

[0093] Please refer to Figures 11 to 12 In an embodiment, the driving mechanism includes a lead screw nut transmission mechanism, the driving member is a motor 161, the nut 163 in the lead screw nut transmission mechanism is the output member, the lock rod assembly 150 is mounted on the nut 163, the motor 161 drives the lead screw 162 in the lead screw nut transmission mechanism, thereby driving the nut 163 and the lock rod assembly 150 to move, and the first axis coincides with the center axis of the lead screw 162 in the lead screw nut transmission mechanism.

[0094] Further, as an example of a rotatable connection, in an embodiment, at least one of the nut 163 and the lock rod assembly 150 has a protrusion 1631, and the other has a corresponding bayonet 1521, the bayonet 1521 is rotatably sleeved on the outer wall of the protrusion 1631, and the inner wall of the bayonet 1521 is in linear contact with the outer wall of the protrusion 1631. Figure 11 and 12 As shown in the structure, the nut 163 is provided with protrusions 1631 on both sides, and the lock rod assembly 150 is provided with a bayonet 1521 corresponding to the protrusions 1631.

[0095] In order to ensure linear contact, in an embodiment, at least one of the inner wall of the bayonet 1521 and the outer wall of the protrusion 1631 has an arc-shaped wall. Please refer to Figures 11 to 12The protrusion 1631 is in the shape of a cylinder, and the arc-shaped outer wall thereof is in line contact with the inner wall of the socket 1521. Of course, in some other embodiments, only the part of the protrusion 1631 in contact with the inner wall of the socket 1521 can be in the shape of an arc-shaped wall, and the other part not in contact can be in some other shape. In addition, the inner wall of the socket 1521 can also be in the shape of an arc-shaped wall, and the protrusion 1631 can be in the shape of an arc-shaped wall or some other shape, such as a flat surface, so as to achieve line contact between the two. In some embodiments, the socket 1521 can also be in the shape of a circular hole, and the protrusion 1631 can be in the shape of a circular shaft, so that both of them are in the shape of an arc-shaped wall. At this time, the socket 1521 is slightly larger than the protrusion 1631, so that the protrusion 1631 can move in the socket 1521, so as to automatically adjust the position of the nut 163 after the locking rod assembly 150 is stressed.

[0096] In addition to the line contact described above, the output member and the locking rod assembly 150 can also be in point contact, for example, the contact parts of the output member and the locking rod assembly 150 are in the shape of a ball, forming a ball-to-ball docking form, so as to form point contact. The point contact positions are symmetrically distributed on both sides of the first axis, and the connecting line of all the contact points is in the same horizontal plane as the first axis and is perpendicular to the first axis.

[0097] Please refer to Figures 11 to 12 In some embodiments, the socket 1521 has a U-shaped opening, and the U-shaped socket 1521 is sleeved on the protrusion 1631.

[0098] Please refer to Figure 13 In some embodiments, the lead screw 162 has a rectangular tooth 1621. The transmission efficiency of the rectangular tooth 1621 is higher than that of a triangular tooth or a trapezoidal tooth, so as to improve the transmission efficiency between the lead screw 162 and the nut 163.

[0099] Please refer to Figure 11 In some embodiments, the motor 161 is in transmission connection with the lead screw 162 of the lead screw nut transmission mechanism through a gear transmission mechanism 164. In some other embodiments, a belt wheel mechanism, a chain wheel mechanism, etc. can also be used to transmit motion.

[0100] Further, the locking rod assembly 150 is buckled with the lock catch assembly 220, so that the lock catch assembly 220 has a lock catch with a hook part, and the locking rod assembly 150 has a buckling part for cooperating with the lock catch. Please refer to Figure 11 and 12In one embodiment, the lock rod assembly 150 includes a lock rod 151 and a connecting member 152, and the fastening portion is arranged on the lock rod 151. The lock rod 151 is connected with the connecting member 152, and the connecting member 152 is rotatably connected with an output member (such as a nut 163), so that the output member drives the connecting member 152 and the lock rod 151 to move. The structure for connecting the lock rod assembly 150 with the output member can be arranged on the connecting member 152. The lock rod 151 and the connecting member 152 can be fixedly connected or integrally formed. The connecting member 152 and the lock rod 151 can be fixedly connected in various ways, for example, including but not limited to screw fastening, clamping, welding, and bonding.

[0101] Please refer to Figure 14 In one embodiment, the fastening portion has a clasp 1511, which is a hook-shaped structure. The clasp 1511 has a fastening surface 1512 for contacting and fastening the corresponding lock catch assembly 220. Please refer to Figure 6 and 8 When the pump door 200 and the pump body 100 need to be locked, the lock catch assembly 220 is first moved to the entrance of the clasp 1511, and then the lock rod 151 is driven by the lock rod driving mechanism 160 to move to the locking position, as shown in the perspective view of Figure 8 In the perspective view, the lock rod 151 moves from right to left to move to the locking position. The fastening surface 1512 is a slope, so it will gradually drive the lock catch assembly 220 to move to the side where the lock rod 151 is located, and finally be clamped into the groove of the clasp 1511. When unlocking is needed, the lock rod 151 is driven by the lock rod driving mechanism 160 to move to the unlocking position, as shown in the perspective view of Figure 8 In the perspective view, the lock rod 151 moves from left to right, thereby releasing the lock catch assembly 220, and at this time the pump door 200 can be opened.

[0102] During the locking process, the resistance that hinders the movement of the pump door 200 to the pump body mainly comes from the reaction force of the infusion tube 300 after being squeezed on the lock catch assembly 220, and the lock catch assembly 220 needs to overcome the reaction force to move a certain distance to the side where the lock rod 151 is located. If the slope of the fastening surface 1512 is too small, the fastening surface 1512 must be arranged very long to pull the lock catch assembly 220 to the position, which will result in that the whole infusion pump is too large, which is not conducive to compact design. If the slope of the fastening surface 1512 is too large, the clasp 1511 will be subjected to a larger force (compared with the case where the slope is too small) from the lock catch assembly 220 when the clasp 1511 pulls the lock catch assembly 220 to the side of the lock rod 151. In order to overcome the force, the lock rod driving mechanism 160 needs to output a larger driving force, which increases the load of the driving member (such as the motor 161), which will cause the cost of the lock rod driving mechanism 160 to increase.

[0103] For this problem, please refer to Figure 14In one embodiment of the application, the clamping surface 1512 has a first inclined surface 1513 and a second inclined surface 1514. The first inclined surface 1513 is arranged at the outer end of the clamping surface 1512, and the second inclined surface 1514 is connected to the inner end of the first inclined surface 1513. The inclination angle A1 of the first inclined surface 1513 is greater than the inclination angle A2 of the second inclined surface 1514.

[0104] When it is necessary to lock the pump door 200 and the pump body, the pump door 200 is first moved to the opening of the clamping buckle 1511, and then the locking rod 151 is driven to move to the locking position. The first inclined surface 1513 of the clamping buckle 1511 first contacts the lock buckle assembly 220. At this stage, the pump door 200 only slightly presses the infusion tube 300, and the reaction force from the infusion tube 300 is not large, so the inclination angle A1 of the first inclined surface 1513 can be set to be relatively large, so as to quickly pull the lock buckle assembly 220 into a distance, which will not cause excessive load on the driving member. When the lock buckle assembly 220 slides along the first inclined surface 1513 to the second inclined surface 1514, the infusion tube 300 has been pressed to a certain extent, so the reaction force of the infusion tube 300 on the pump door 200 and the lock buckle assembly 220 increases. At this time, since the inclination of the second inclined surface 1514 is smaller than that of the first inclined surface 1513, the driving member will not be subjected to excessive load during the pulling of the lock buckle assembly 220. Finally, the lock buckle slides through the second inclined surface 1514 and into the groove of the clamping buckle 1511, thereby completing the locking.

[0105] The first inclined surface 1513 has a large inclination, which can quickly pull the lock buckle assembly 220 and the pump door 200 to a certain position, and then slowly pull the lock buckle assembly 220 through the second inclined surface 1514. In this combined structure, the stroke of the lock buckle assembly 220 on the clamping surface 1512 can be reduced, so the locking rod 151 does not need to be too long, which is beneficial to the compactness of the device, and can also reduce the load on the driving member (such as the motor 161), avoid damage to the driving member, and reduce the cost of the locking rod driving mechanism 160.

[0106] Please refer to Figure 11 and 12 In one embodiment, the locking rod 151 is a long strip-shaped plate structure, and the clamping portions are at least two and are arranged on the side of the locking rod 151 facing the corresponding lock buckle. Please refer to Figure 5 The clamping buckle 1511 shown in the figure is three, which are arranged at equal intervals on the locking rod 151. The corresponding lock buckles are also three and correspond to the positions of the clamping buckles 1511.

[0107] The above application of specific examples is used to illustrate the application, which is only used to help understand the application and does not limit the application. For those skilled in the art to which the application belongs, according to the idea of the application, a number of simple deductions, deformations or substitutions can be made.

Claims

1. An infusion pump, characterized in that The pump body comprises a transfusion tube mounting structure for mounting a transfusion tube, a first metal mounting base, and a pump body assembly arranged opposite to the transfusion tube mounting structure and mounted on the first metal mounting base to squeeze the transfusion tube; and the pump door comprises a second metal mounting base and a tube pressing assembly mounted on the second metal mounting base, the tube pressing assembly being used to press against the transfusion tube from a side of the transfusion tube away from the pump body assembly. The pump body further comprises a pump body shell, and the first metal mounting base is mounted in the pump body shell; the pump door further comprises a door body, and the second metal mounting base is arranged in the door body. The first metal mounting base and the second metal mounting base are hingedly connected, and the second metal mounting base rotates relative to the first metal mounting base, and has a locking position and an unlocking position in a movement track of the second metal mounting base. The first metal mounting base has a first locking structure, and the second metal mounting base has a second locking structure; in the locking position, the first locking structure and the second locking structure are fixedly connected, and the tube pressing assembly and the pump body assembly are located on two sides of the transfusion tube, so that the pump body assembly squeezes the transfusion tube when activated to perform transfusion. In the unlocking position, the first locking structure and the second locking structure are unlocked, so that the tube pressing assembly can be moved away from one side of the transfusion tube to release the transfusion tube. The first locking structure comprises a lock rod assembly and a driving mechanism, the lock rod assembly has a buckling part for cooperating with a corresponding second locking structure, the driving mechanism has a driving member and an output member in transmission connection with the driving member, the lock rod assembly is rotatably mounted on the output member, and the output member drives the lock rod assembly to make reciprocating linear motion along a first axis in a horizontal plane, so as to lock or unlock the lock rod assembly with the second locking structure; the first axis passes through an axis center of the output member, a rotation center line of the lock rod assembly relative to the output member is in the same horizontal plane as the first axis and is perpendicular to the first axis. The first metal mounting base comprises an upper metal piece and a lower metal piece, the pump body assembly is fixedly mounted on the lower metal piece or the upper metal piece, the first locking structure is mounted on the upper metal piece, and the upper metal piece is fixedly mounted on the lower metal piece, and the second metal mounting base is hingedly connected with the lower metal piece. The lower metal piece is substantially in a U-shaped structure, the upper metal piece is substantially in an inverted U-shaped structure, and the upper metal piece is in butt joint with the lower metal piece and is fixedly connected with the lower metal piece through a metal piece.

2. The infusion pump of claim 1, wherein, The pump body shell has a bottom cover, a top cover, a front cover, and a rear cover, the bottom cover, the top cover, the front cover, and the rear cover enclose a mounting cavity, the first metal mounting base and the pump body assembly are mounted in the mounting cavity, the transfusion tube mounting structure is arranged on the front cover, the front cover has a pump mounting opening, and one end of the pump body assembly is located at the pump mounting opening, so that the pump body assembly squeezes the transfusion tube.

3. The infusion pump of claim 2, wherein, ​ 4. The infusion pump of claim 1, wherein, ​ 5. The infusion pump of claim 1, wherein, The output member and the lock rod assembly are in line contact and / or point contact, the contact positions of the line contact and / or the contact positions of the point contact are symmetrically distributed on both sides of the first axis and are in the same horizontal plane as the first axis, and the line connecting the contact positions of the output member and the lock rod assembly is perpendicular to the first axis.

6. The infusion pump of claim 5, wherein, The driving mechanism includes a screw nut transmission mechanism, the driving member is a motor, the nut in the screw nut transmission mechanism serves as the output member, the lock rod assembly is mounted on the nut, and the motor drives a screw in the screw nut transmission mechanism, thereby driving the nut and the lock rod assembly to move, and the first axis coincides with the central axis of the screw in the screw nut transmission mechanism.

7. The infusion pump of claim 6, wherein, At least one of the nut and the lock rod assembly has a protrusion, and the other has a corresponding socket, the socket is sleeved on the outer wall of the protrusion, and the inner wall of the socket is in line contact with the outer wall of the protrusion.

8. The infusion pump of claim 7, wherein, At least one of the inner wall of the socket and the outer wall of the protrusion has an arc-shaped wall body.

9. The infusion pump of claim 7, wherein, The socket has a U-shaped opening, and the socket with the U-shaped opening is sleeved on the protrusion.

10. The infusion pump of claim 7, wherein, The nut is provided with the protrusions on both sides, and the lock rod assembly is provided with the sockets corresponding to the protrusions.

11. The infusion pump of claim 5, wherein, The buckle has a clasp, the clasp has a buckling surface for contacting and buckling the second locking structure, the buckling surface has a first inclined surface and a second inclined surface, the first inclined surface is arranged at the outer end of the buckling surface, the second inclined surface is connected to the inward end of the first inclined surface, and the inclination angle of the first inclined surface is greater than that of the second inclined surface.

12. The infusion pump of claim 5, wherein, The lock rod assembly includes a lock rod and a connecting member, the lock rod has the buckle, the lock rod is connected to the connecting member, and the connecting member is rotatably connected to the output member, so that the output member drives the connecting member and the lock rod to move.

13. The infusion pump of claim 12, wherein, The lock rod is a long strip-shaped structure, and the buckle is at least two, which are arranged on the side of the lock rod facing the corresponding lock.

14. The infusion pump of claim 5, wherein, The first metal mounting seat has a protruding guide portion, the lock rod assembly has a corresponding guide port, the guide port is sleeved on the guide portion, and the area in the guide port in contact with the guide portion is provided with a wear-resistant member.

15. The infusion pump of any one of claims 1-14, wherein, The pump door further includes a door body, the second metal mounting seat is mounted in the door body, and the second metal mounting seat serves as at least one of a front cover, a bottom cover, a top cover and a rear cover of the pump door.

16. The infusion pump of any one of claims 1-14, wherein, The second metal mounting seat is a box body structure.

17. The infusion pump of any one of claims 1-14, wherein, The second locking structure has a lock catch for buckling and locking with the first locking structure.

18. The infusion pump of any one of claims 1-14, wherein, The pump body assembly includes a pump mounting seat, a peristaltic pump and an elastic member, the pump mounting seat is fixedly mounted on the first metal mounting seat, the peristaltic pump is mounted on the pump mounting seat, and the elastic member acts between the peristaltic pump and the first metal mounting seat to provide an elastic restoring force for driving the peristaltic pump to move towards the pressure tube assembly.

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